Update pdfioinfo example to support Acrobat Form dictionaries as well as indirect references (Issue #114)

Fix output of special characters in string values (Issue #107)
Fi output of large integers in dictionaries (Issue #108)

Bump version to 1.5.1.

.github/workflows/build.yml

@@ -9,23 +9,26 @@ on:
 jobs:
   build-linux:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: update build environment
+    - name: Checkout PDFio sources
+      uses: actions/checkout@v4
+    - name: Update Build Environment
       run: sudo apt-get update --fix-missing -y
-    - name: install prerequisites
-      run: sudo apt-get install -y cppcheck zlib1g-dev
-    - name: make
+    - name: Install Prerequisites
+      run: sudo apt-get install -y cppcheck zlib1g-dev libpng-dev
+    - name: Configure PDFio
+      run: ./configure --enable-debug --enable-sanitizer --enable-maintainer
+    - name: Build PDFio
       run: make "COMMONFLAGS=-g -fsanitize=address"
-    - name: test
+    - name: Test PDFio
       env:
         ASAN_OPTIONS: leak_check_at_exit=false
       run: make test
-    - name: clang static analyzer
+    - name: Run Clang Static Analyzer
       run: make CC=clang "GHA_ERROR=::error::" clang
-    - name: cppcheck
+    - name: Run cppcheck
       run: make "GHA_ERROR=::error::" cppcheck
 
   build-macos:
@@ -33,12 +36,15 @@ jobs:
     runs-on: macos-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: make
+    - name: Checkout PDFio sources
+      uses: actions/checkout@v4
+    - name: Configure PDFio
+      run: ./configure --enable-debug --enable-sanitizer --enable-maintainer
+    - name: Build PDFio
       run: make "COMMONFLAGS=-g -fsanitize=address"
-    - name: test
+    - name: Test PDFio
       run: make test
-    - name: clang static analyzer
+    - name: Run Clang Static Analyzer
       run: make CC=clang "GHA_ERROR=::error::" clang
 
   build-windows:
@@ -46,10 +52,13 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: setup-msbuild
+    - name: Checkout PDFio sources
+      uses: actions/checkout@v4
+    - name: Setup MSBuild
       uses: microsoft/setup-msbuild@v1.0.2
-    - name: nuget restore
+    - name: Nuget Restore
       run: nuget restore pdfio.sln
-    - name: msbuild
+    - name: Build PDFio
       run: msbuild pdfio.sln
+    - name: Test PDFio
+      run: .\runtests.bat x64\Debug

.github/workflows/codeql.yml

@@ -23,16 +23,16 @@ jobs:
         language: [ cpp ]
 
     steps:
-      - name: Checkout
-        uses: actions/checkout@v3
+      - name: Checkout PDFio sources
+        uses: actions/checkout@v4
         with:
           submodules: recursive
 
-      - name: Update build environment
+      - name: Update Build Environment
         run: sudo apt-get update --fix-missing -y
 
-      - name: Install prerequisites
-        run: sudo apt-get install -y zlib1g-dev
+      - name: Install Prerequisites
+        run: sudo apt-get install -y zlib1g-dev libpng-dev
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v2

.github/workflows/coverity.yml

@@ -7,11 +7,12 @@ jobs:
     runs-on: ubuntu-latest
     environment: Coverity
     steps:
-      - uses: actions/checkout@v2
-      - name: update build environment
+      - name: Checkout PDFio sources
+        uses: actions/checkout@v4
+      - name: Update Build Environment
         run: sudo apt-get update --fix-missing -y
-      - name: install prerequisites
-        run: sudo apt-get install -y zlib1g-dev
+      - name: Install Prerequisites
+        run: sudo apt-get install -y zlib1g-dev libpng-dev
       - name: Download Coverity Build Tool
         run: |
           wget -q https://scan.coverity.com/download/linux64 --post-data token="$TOKEN&project=$GITHUB_REPOSITORY" -O cov-analysis-linux64.tar.gz
@@ -20,11 +21,15 @@ jobs:
         env:
           TOKEN: ${{ secrets.COVERITY_SCAN_TOKEN }}
 
-      - name: Build with cov-build
+      - name: Configure PDFio
+        run: ./configure --enable-debug --enable-maintainer
+
+      - name: Build PDFio with cov-build
         run: |
           export PATH=`pwd`/cov-analysis-linux64/bin:$PATH
           cov-build --dir cov-int make
-      - name: Submit the result to Coverity Scan
+
+      - name: Submit the Result to Coverity Scan
         run: |
           tar czvf cov.tgz cov-int
           curl \

.gitignore

@@ -1,16 +1,28 @@
 *.1.dylib
 *.a
+*.dSYM
 *.log
 *.o
 *.so.1
 /.vs
 /afl-output
+/autom4te.cache
+/config.log
+/config.status
+/configure~
 /doc/pdfio.epub
+/examples/code128
+/examples/image2pdf
+/examples/md2pdf
+/examples/pdf2text
+/examples/pdfioinfo
+/examples/pdfiomerge
+/Makefile
 /packages
+/pdfio.pc
 /pdfio.xcodeproj/xcshareddata
 /pdfio-*.tar.gz*
 /pdfio-*.zip*
-/pdfiototext
 /testpdfio
 /testpdfio-*.pdf
 /testttf

CHANGES.md

@@ -2,15 +2,141 @@ Changes in PDFio
 ================
 
 
-v1.1.3 (November 15, 2023)
---------------------------
+v1.5.2 - YYYY-MM-DD
+-------------------
+
+- Updated maximum allowed PDF string size to 64k (Issue #117)
+- Fixed form detection in `pdfioinfo` example code (Issue #114)
+- Fixed parsing of certain date/time values (Issue #115)
+- Fixed support for empty name values (Issue #116)
+
+
+v1.5.1 - 2025-03-28
+-------------------
+
+- Fixed output of special characters in name values (Issue #106)
+- Fixed output of special characters in string values (Issue #107)
+- Fixed output of large integers in dictionaries (Issue #108)
+- Fixed handling of 0-length streams (Issue #111)
+- Fixed detection of UTF-16 Big-Endian strings (Issue #112)
+
+
+v1.5.0 - 2025-03-06
+-------------------
+
+- Added support for embedded color profiles in JPEG images (Issue #7)
+- Added `pdfioFileCreateICCObjFromData` API.
+- Added support for writing cross-reference streams for PDF 1.5 and newer files
+  (Issue #10)
+- Added `pdfioFileGetModDate()` API (Issue #88)
+- Added support for using libpng to embed PNG images in PDF output (Issue #90)
+- Added support for writing the PCLm subset of PDF (Issue #99)
+- Now support opening damaged PDF files (Issue #45)
+- Updated documentation (Issue #95)
+- Updated the pdf2txt example to support font encodings.
+- Fixed potential heap/integer overflow issues in the TrueType cmap code.
+- Fixed an output issue for extremely small `double` values with the
+  `pdfioContent` APIs.
+- Fixed a missing Widths array issue for embedded TrueType fonts.
+- Fixed some Unicode font embedding issues.
+
+
+v1.4.1 - 2025-01-24
+-------------------
+
+- Added license files for the example fonts now bundled with PDFio (Issue #91)
+- Fixed the link libraries for the example source code (Issue #86)
+- Fixed handling of the Info object (Issue #87)
+- Fixed opening of PDF files less than 1024 bytes in length (Issue #87)
+- Fixed potential `NULL` dereference when reading (Issue #89)
+- Fixed reading of compressed object streams (Issue #92)
+- Fixed reading of UTF-16 string values (Issue #92)
+
+
+v1.4.0 - 2024-12-26
+-------------------
+
+- Added new `pdfioDictGetKey` and `pdfioDictGetNumPairs` APIs (Issue #63)
+- Added new `pdfioArrayRemove` and `pdfioDictClear` APIs (Issue #74)
+- Added new `pdfioFileCreateNameObj` and `pdfioObjGetName` APIs for creating and
+  getting name object values (Issue #76)
+- Updated documentation (Issue #78)
+- Updated `pdfioContentTextMeasure` to support measuring PDF base fonts created
+  with `pdfioFileCreateFontObjFromBase` (Issue #84)
+- Fixed reading of PDF files whose trailer is missing a newline (Issue #80)
+- Fixed builds with some versions of VC++ (Issue #81)
+- Fixed validation of date/time values (Issue #83)
+
+
+v1.3.2 - 2024-08-15
+-------------------
+
+- Added some more sanity checks to the TrueType font reader.
+- Updated documentation (Issue #77)
+- Fixed an issue when opening certain encrypted PDF files (Issue #62)
+
+
+v1.3.1 - 2024-08-05
+-------------------
+
+- CVE 2024-42358: Updated TrueType font reader to avoid large memory
+  allocations.
+- Fixed some documentation errors and added examples (Issue #68, Issue #69)
+
+
+v1.3.0 - 2024-06-28
+-------------------
+
+- Added `pdfioFileGetCatalog` API for accessing the root/catalog object of a
+  PDF file (Issue #67)
+- Updated number support to avoid locale issues (Issue #61)
+- Updated the PDFio private header to allow compilation with MingW; note that
+  MingW is NOT a supported toolchain for PDFio (Issue #66)
+- Optimized string pool code.
+
+
+v1.2.0 - 2024-01-24
+-------------------
+
+- Now use autoconf to configure the PDFio sources (Issue #54)
+- Added `pdfioFileCreateNumberObj` and `pdfioFileCreateStringObj` functions
+  (Issue #14)
+- Added `pdfioContentTextMeasure` function (Issue #17)
+- Added `pdfioContentTextNewLineShow` and `pdfioContentTextNewLineShowf`
+  functions (Issue #24)
+- Renamed `pdfioContentTextNextLine` to `pdfioContentTextNewLine`.
+- Updated the maximum number of object streams in a single file from 4096 to
+  8192 (Issue #58)
+- Updated the token reading code to protect against some obvious abuses of the
+  PDF format.
+- Updated the xref reading code to protect against loops.
+- Updated the object handling code to use a binary insertion algorithm -
+  provides a significant (~800x) improvement in open times.
+- Fixed handling of encrypted PDFs with per-object file IDs (Issue #42)
+- Fixed handling of of trailer dictionaries that started immediately after the
+  "trailer" keyword (Issue #58)
+- Fixed handling of invalid, but common, PDF files with a generation number of
+  65536 in the xref table (Issue #59)
+
+
+v1.1.4 - 2023-12-03
+-------------------
+
+- Fixed detection of encrypted strings that are too short (Issue #52)
+- Fixed a TrueType CMAP decoding bug.
+- Fixed a text rendering issue for Asian text.
+- Added a ToUnicode map for Unicode text to support text copying.
+
+
+v1.1.3 - 2023-11-15
+-------------------
 
 - Fixed Unicode font support (Issue #16)
 - Fixed missing initializer for 40-bit RC4 encryption (Issue #51)
 
 
-v1.1.2 (October 10, 2023)
--------------------------
+v1.1.2 - 2023-10-10
+-------------------
 
 - Updated `pdfioContentSetDashPattern` to support setting a solid (0 length)
   dash pattern (Issue #41)
@@ -25,15 +151,15 @@ v1.1.2 (October 10, 2023)
   (Issue #48)
 
 
-v1.1.1 (March 20, 2023)
------------------------
+v1.1.1 - 2023-03-20
+-------------------
 
 - CVE-2023-28428: Fixed a potential denial-of-service with corrupt PDF files.
 - Fixed a few build issues.
 
 
-v1.1.0 (February 6, 2023)
--------------------------
+v1.1.0 - 2023-02-06
+-------------------
 
 - CVE-2023-24808: Fixed a potential denial-of-service with corrupt PDF files.
 - Added `pdfioFileCreateTemporary` function (Issue #29)
@@ -47,28 +173,28 @@ v1.1.0 (February 6, 2023)
 - Fixed `pdfioContentMatrixRotate` function.
 
 
-v1.0.1 (March 2, 2022)
-----------------------
+v1.0.1 - 2022-03-02
+-------------------
 
 - Added missing `pdfioPageGetNumStreams` and `pdfioPageOpenStream` functions.
 - Added demo pdfiototext utility.
 - Fixed bug in `pdfioStreamGetToken`.
 
 
-v1.0.0 (December 14, 2021)
---------------------------
+v1.0.0 - 2021-12-14
+-------------------
 
 - First stable release.
 
 
-v1.0rc1 (November 30, 2021)
----------------------------
+v1.0rc1 - 2021-11-30
+--------------------
 
 - Fixed a few stack/buffer overflow bugs discovered via fuzzing.
 
 
-v1.0b2 (November 7, 2021)
--------------------------
+v1.0b2 - 2021-11-07
+-------------------
 
 - Added `pdfioFileCreateOutput` API to support streaming output of PDF
   (Issue #21)
@@ -79,7 +205,7 @@ v1.0b2 (November 7, 2021)
 - Fixed some issues identified by a Coverity scan.
 
 
-v1.0b1 (August 30, 2021)
-------------------------
+v1.0b1 - 2021-08-30
+-------------------
 
 - Initial release

CONTRIBUTING.md

@@ -43,14 +43,17 @@ Contents
 Build System
 ------------
 
-The build system uses a simple POSIX makefile to build a static or shared
-library.  To improve portability, makefiles *must not* make use of features
-unique to GNU make.  See the [Makefile Guidelines](#makefile-guidelines) section
-for a description of the allowed make features and makefile guidelines.
+The build system uses [GNU autoconf][AUTOCONF] to create a simple POSIX makefile
+to build static and/or shared libraries.  To improve portability, makefiles
+*must not* make use of features unique to GNU make.  See the
+[Makefile Guidelines](#makefile-guidelines) section for a description of the
+allowed make features and makefile guidelines.
 
 An Xcode project is provided for macOS/iOS developers, and a Visual Studio
 solution and projects for Windows developers.
 
+[AUTOCONF]: https://www.gnu.org/software/autoconf/
+
 
 Version Numbering
 -----------------
@@ -373,14 +376,15 @@ The following variables are defined in the makefile:
 - `CC`; the C compiler command,
 - `CFLAGS`; options for the C compiler,
 - `CODESIGN_IDENTITY`: the code signing identity,
-- `COMMONFLAGS`; common compiler optimization options,
 - `CPPFLAGS`; options for the C preprocessor,
 - `DESTDIR`/`DSTROOT`: the destination root directory when installing.
 - `DSO`; the shared library building command,
 - `DSOFLAGS`; options for the shared library building command,
-- `DSONAME`: the root name of the shared library
 - `LDFLAGS`; options for the linker,
+- `LIBPDFIO`: the name of the primary (shared or static) library
+- `LIBPDFIO_STATIC`: the name of the secondary (static) library
 - `LIBS`; libraries for all programs,
+- `OPTIM`; common compiler optimization options,
 - `prefix`; the installation prefix directory,
 - `RANLIB`; the static library indexing command,
 - `SHELL`; the sh (POSIX shell) command,
@@ -389,12 +393,7 @@ The following variables are defined in the makefile:
 The following standard targets are defined in the makefile:
 
 - `all`; creates the static library and unit test program.
-- `all-shared`; creates a shared library appropriate for the local system.
 - `clean`; removes all target programs libraries, documentation files, and
   object files,
-- `debug`: creates a clean build of the static library and unit test program
-  with debug printfs and the clang address sanitizer enabled.
 - `install`; installs all distribution files in their corresponding locations.
-- `install-shared`; same as `install` but also installs the shared library.
-- `macos`; same as `all` but creates a Universal Binary (X64 + ARM64).
 - `test`; runs the unit test program, building it as needed.

EXAMPLES.md

@@ -0,0 +1,18 @@
+PDFio Examples
+==============
+
+The "examples" subdirectory contains example code showing how to do different
+things with PDFio.
+
+
+code128.c
+---------
+
+This example shows how to embed and use a barcode font.
+
+
+md2pdf.c
+--------
+
+This example shows how to generate pages with multiple fonts, embedded images,
+and headers and footers.

Makefile

@@ -1,233 +0,0 @@
-#
-# Makefile for PDFio.
-#
-# Copyright © 2021-2023 by Michael R Sweet.
-#
-# Licensed under Apache License v2.0.  See the file "LICENSE" for more
-# information.
-#
-
-# POSIX makefile
-.POSIX:
-
-# Build silently
-.SILENT:
-
-# Variables
-AR		=	ar
-ARFLAGS		=	cr
-CC		=	cc
-CFLAGS		=
-CODESIGN_IDENTITY =	Developer ID
-COMMONFLAGS	=	-Os -g
-#COMMONFLAGS	=	-O0 -g -fsanitize=address
-CPPFLAGS	=
-DESTDIR		=	$(DSTROOT)
-DSO		=	cc
-DSOFLAGS	=
-DSONAME		=
-LDFLAGS		=
-LIBS		=	-lm -lz
-RANLIB		=	ranlib
-VERSION		=	1.1.3
-prefix		=	/usr/local
-
-
-# Base rules
-.SUFFIXES:	.c .h .o
-.c.o:
-	echo Compiling $<...
-	$(CC) $(CFLAGS) $(CPPFLAGS) $(COMMONFLAGS) -c $<
-
-
-# Files
-PUBHEADERS	=	\
-			pdfio.h \
-			pdfio-content.h
-PUBOBJS		=	\
-			pdfio-aes.o \
-			pdfio-array.o \
-			pdfio-common.o \
-			pdfio-content.o \
-			pdfio-crypto.o \
-			pdfio-dict.o \
-			pdfio-file.o \
-			pdfio-md5.o \
-			pdfio-object.o \
-			pdfio-page.o \
-			pdfio-rc4.o \
-			pdfio-sha256.o \
-			pdfio-stream.o \
-			pdfio-string.o \
-			pdfio-token.o \
-			pdfio-value.o
-LIBOBJS		=	\
-			$(PUBOBJS) \
-			ttf.o
-OBJS		=	\
-			$(LIBOBJS) \
-			pdfiototext.o \
-			testpdfio.o \
-			testttf.o
-TARGETS		=	\
-			$(DSONAME) \
-			libpdfio.a \
-			pdfiototext \
-			testpdfio \
-			testttf
-
-
-# Make everything
-all:		$(TARGETS)
-
-all-shared:
-	if test `uname` = Darwin; then \
-		$(MAKE) DSONAME="libpdfio.1.dylib" -$(MAKEFLAGS) all; \
-	else \
-		$(MAKE) COMMONFLAGS="-g -Os -fPIC" DSONAME="libpdfio.so.1" -$(MAKEFLAGS) all; \
-	fi
-
-debug:
-	$(MAKE) -$(MAKEFLAGS) COMMONFLAGS="-g -fsanitize=address -DDEBUG=1" clean all
-
-macos:
-	$(MAKE) -$(MAKEFLAGS) COMMONFLAGS="-Os -mmacosx-version-min=11 -arch x86_64 -arch arm64" clean all
-
-
-# Clean everything
-clean:
-	rm -f $(TARGETS) $(OBJS)
-
-
-# Install everything
-install:	$(TARGETS)
-	echo Installing header files to $(DESTDIR)$(prefix)/include...
-	-mkdir -p $(DESTDIR)$(prefix)/include
-	cp $(PUBHEADERS) $(DESTDIR)$(prefix)/include
-	echo Installing library files to $(DESTDIR)$(prefix)/lib...
-	-mkdir -p $(DESTDIR)$(prefix)/lib
-	cp libpdfio.a $(DESTDIR)$(prefix)/lib
-	$(RANLIB) $(DESTDIR)$(prefix)/lib/libpdfio.a
-	if test "x$(DSONAME)" = xlibpdfio.so.1; then \
-		cp $(DSONAME) $(DESTDIR)$(prefix)/lib; \
-		ln -sf libpdfio.so.1 $(DESTDIR)$(prefix)/lib/libpdfio.so; \
-	elif test "x$(DSONAME)" = xlibpdfio.1.dylib; then \
-		cp $(DSONAME) $(DESTDIR)$(prefix)/lib; \
-		codesign -s "$(CODESIGN_IDENTITY)" -o runtime --timestamp $(DESTDIR)$(prefix)/lib/libpdfio.1.dylib; \
-		ln -sf libpdfio.1.dylib $(DESTDIR)$(prefix)/lib/libpdfio.dylib; \
-	fi
-	echo Installing pkg-config files to $(DESTDIR)$(prefix)/lib/pkgconfig...
-	-mkdir -p $(DESTDIR)$(prefix)/lib/pkgconfig
-	echo 'prefix="$(prefix)"' >$(DESTDIR)$(prefix)/lib/pkgconfig/pdfio.pc
-	echo 'Version: $(VERSION)' >>$(DESTDIR)$(prefix)/lib/pkgconfig/pdfio.pc
-	cat pdfio.pc.in >>$(DESTDIR)$(prefix)/lib/pkgconfig/pdfio.pc
-	echo Installing documentation to $(DESTDIR)$(prefix)/share/doc/pdfio...
-	-mkdir -p $(DESTDIR)$(prefix)/share/doc/pdfio
-	cp doc/pdfio.html doc/pdfio-512.png LICENSE NOTICE $(DESTDIR)$(prefix)/share/doc/pdfio
-	echo Installing man page to $(DESTDIR)$(prefix)/share/man/man3...
-	-mkdir -p $(DESTDIR)$(prefix)/share/man/man3
-	cp doc/pdfio.3 $(DESTDIR)$(prefix)/share/man/man3
-
-install-shared:
-	if test `uname` = Darwin; then \
-		$(MAKE) DSONAME="libpdfio.1.dylib" -$(MAKEFLAGS) install; \
-	else \
-		$(MAKE) DSONAME="libpdfio.so.1" -$(MAKEFLAGS) install; \
-	fi
-
-
-# Test everything
-test:	testpdfio
-	./testttf 2>test.log
-	./testpdfio 2>test.log
-
-valgrind:	testpdfio
-	valgrind --leak-check=full ./testpdfio
-
-
-# pdfio library
-libpdfio.a:		$(LIBOBJS)
-	echo Archiving $@...
-	$(AR) $(ARFLAGS) $@ $(LIBOBJS)
-	$(RANLIB) $@
-
-libpdfio.so.1:		$(LIBOBJS)
-	echo Linking $@...
-	$(CC) $(DSOFLAGS) $(COMMONFLAGS) -shared -o $@ -Wl,-soname,$@ $(LIBOBJS) $(LIBS)
-
-libpdfio.1.dylib:	$(LIBOBJS)
-	echo Linking $@...
-	$(CC) $(DSOFLAGS) $(COMMONFLAGS) -dynamiclib -o $@ -install_name $(prefix)/lib/$@ -current_version $(VERSION) -compatibility_version 1.0 $(LIBOBJS) $(LIBS)
-
-
-# pdfio1.def (Windows DLL exports file...)
-#
-# I'd love to use __declspec(dllexport) but MS puts it before the function
-# declaration instead of after like everyone else, and it breaks Codedoc and
-# other tools I rely on...
-pdfio1.def: $(LIBOBJS) Makefile
-	echo Generating $@...
-	echo "LIBRARY pdfio1" >$@
-	echo "VERSION 1.0" >>$@
-	echo "EXPORTS" >>$@
-	nm $(LIBOBJS) 2>/dev/null | grep "T _" | awk '{print $$3}' | \
-		grep -v '^_ttf' | sed -e '1,$$s/^_//' | sort >>$@
-
-
-# pdfio text extraction (demo, doesn't handle a lot of things yet)
-pdfiototext:		pdfiototext.o libpdfio.a
-	echo Linking $@...
-	$(CC) $(LDFLAGS) $(COMMONFLAGS) -o $@ pdfiototext.o libpdfio.a $(LIBS)
-
-
-# pdfio test program
-testpdfio:		testpdfio.o libpdfio.a
-	echo Linking $@...
-	$(CC) $(LDFLAGS) $(COMMONFLAGS) -o $@ testpdfio.o libpdfio.a $(LIBS)
-
-# TTF test program
-testttf:	ttf.o testttf.o
-	echo Linking $@...
-	$(CC) $(LDFLAGS) $(COMMONFLAGS) -o testttf ttf.o testttf.o $(LIBS)
-
-
-# Dependencies
-$(OBJS):		pdfio.h pdfio-private.h Makefile
-pdfio-content.o:	pdfio-content.h ttf.h
-testttf.o:		ttf.h
-ttf.o:			ttf.h
-
-# Make documentation using Codedoc <https://www.msweet.org/codedoc>
-DOCFLAGS	=	\
-			--author "Michael R Sweet" \
-			--copyright "Copyright (c) 2021-2023 by Michael R Sweet" \
-			--docversion $(VERSION)
-
-.PHONY: doc
-doc:
-	echo Generating documentation...
-	codedoc $(DOCFLAGS) --title "PDFio Programming Manual v$(VERSION)" $(PUBHEADERS) $(PUBOBJS:.o=.c) --body doc/pdfio.md --coverimage doc/pdfio-512.png pdfio.xml >doc/pdfio.html
-	codedoc $(DOCFLAGS) --title "PDFio Programming Manual v$(VERSION)" --body doc/pdfio.md --coverimage doc/pdfio-epub.png pdfio.xml --epub doc/pdfio.epub
-	codedoc $(DOCFLAGS) --title "pdf read/write library" --man pdfio --section 3 --body doc/pdfio.md pdfio.xml >doc/pdfio.3
-	rm -f pdfio.xml
-
-
-# Fuzz-test the library <>
-.PHONY: afl
-afl:
-	$(MAKE) -$(MAKEFLAGS) CC="afl-clang-fast" COMMONFLAGS="-g" clean all
-	test afl-output || rm -rf afl-output
-	afl-fuzz -x afl-pdf.dict -i afl-input -o afl-output -V 600 -e pdf -t 5000 ./testpdfio @@
-
-
-# Analyze code with the Clang static analyzer <https://clang-analyzer.llvm.org>
-clang:
-	clang $(CPPFLAGS) --analyze $(OBJS:.o=.c) 2>clang.log
-	rm -rf $(OBJS:.o=.plist)
-	test -s clang.log && (echo "$(GHA_ERROR)Clang detected issues."; echo ""; cat clang.log; exit 1) || exit 0
-
-
-# Analyze code using Cppcheck <http://cppcheck.sourceforge.net>
-cppcheck:
-	cppcheck $(CPPFLAGS) --template=gcc --addon=cert.py --suppressions-list=.cppcheck $(OBJS:.o=.c) 2>cppcheck.log
-	test -s cppcheck.log && (echo "$(GHA_ERROR)Cppcheck detected issues."; echo ""; cat cppcheck.log; exit 1) || exit 0

Makefile.in

@@ -0,0 +1,281 @@
+#
+# Makefile for PDFio.
+#
+# Copyright © 2021-2025 by Michael R Sweet.
+#
+# Licensed under Apache License v2.0.  See the file "LICENSE" for more
+# information.
+#
+
+# POSIX makefile
+.POSIX:
+
+
+# Build silently
+.SILENT:
+
+
+# Version numbers...
+PDFIO_VERSION		=	@PDFIO_VERSION@
+PDFIO_VERSION_MAJOR	=	@PDFIO_VERSION_MAJOR@
+PDFIO_VERSION_MINOR	=	@PDFIO_VERSION_MINOR@
+
+
+# Programs and options...
+AR		=	@AR@
+ARFLAGS		=	@ARFLAGS@
+CC		=	@CC@
+CFLAGS		=	@CFLAGS@ $(CPPFLAGS) $(OPTIM) $(WARNINGS)
+CODE_SIGN	=	@CODE_SIGN@
+CODESIGN_IDENTITY =	-
+CPPFLAGS	=	@CPPFLAGS@
+CSFLAGS		=	-s "$(CODESIGN_IDENTITY)" @CSFLAGS@ --timestamp
+DSOFLAGS	=	@DSOFLAGS@ $(CFLAGS)
+INSTALL		=	@INSTALL@
+LDFLAGS		=	@LDFLAGS@ $(OPTIM)
+LIBS		=	@LIBS@ -lm
+LN		=	@LN@
+OPTIM		=	@OPTIM@
+RANLIB		=	@RANLIB@
+RM		=	@RM@ -f
+RMDIR		=	@RMDIR@
+SHELL		=	/bin/sh
+WARNINGS	=	@WARNINGS@
+
+
+# Targets
+LIBPDFIO	=	@LIBPDFIO@
+LIBPDFIO_STATIC	=	@LIBPDFIO_STATIC@
+
+
+# Directories...
+bindir		=	@bindir@
+datadir		=	@datadir@
+datarootdir	=	@datarootdir@
+exec_prefix	=	@exec_prefix@
+includedir	=	@includedir@
+infodir		=	@infodir@
+libdir		=	@libdir@
+libexecdir	=	@libexecdir@
+localstatedir	=	@localstatedir@
+mandir		=	@mandir@
+oldincludedir	=	@oldincludedir@
+prefix		=	@prefix@
+sbindir		=	@sbindir@
+sharedstatedir	=	@sharedstatedir@
+srcdir		=	@srcdir@
+sysconfdir	=	@sysconfdir@
+top_srcdir	=	@top_srcdir@
+
+BUILDROOT	=	$(DSTROOT)$(RPM_BUILD_ROOT)$(DESTDIR)
+
+
+# Build commands...
+.SUFFIXES:	.c .h .o
+.c.o:
+	echo Compiling $<...
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+
+# Files
+PUBHEADERS	=	\
+			pdfio.h \
+			pdfio-content.h
+PUBOBJS		=	\
+			pdfio-aes.o \
+			pdfio-array.o \
+			pdfio-common.o \
+			pdfio-content.o \
+			pdfio-crypto.o \
+			pdfio-dict.o \
+			pdfio-file.o \
+			pdfio-md5.o \
+			pdfio-object.o \
+			pdfio-page.o \
+			pdfio-rc4.o \
+			pdfio-sha256.o \
+			pdfio-stream.o \
+			pdfio-string.o \
+			pdfio-token.o \
+			pdfio-value.o
+LIBOBJS		=	\
+			$(PUBOBJS) \
+			ttf.o
+OBJS		=	\
+			$(LIBOBJS) \
+			testpdfio.o \
+			testttf.o
+TARGETS		=	\
+			$(LIBPDFIO) \
+			$(LIBPDFIO_STATIC) \
+			testpdfio \
+			testttf
+DOCFILES	=	\
+			doc/pdfio.html \
+			doc/pdfio-512.png \
+			LICENSE \
+			NOTICE
+EXAMPLES	=	\
+			examples/Makefile \
+			examples/Roboto-LICENSE.txt \
+			examples/Roboto-Bold.ttf \
+			examples/Roboto-Italic.ttf \
+			examples/Roboto-Regular.ttf \
+			examples/RobotoMono-Regular.ttf \
+			examples/code128.c \
+			examples/code128.ttf \
+			examples/code128-LICENSE.txt \
+			examples/image2pdf.c \
+			examples/md2pdf.c \
+			examples/md2pdf.md \
+			examples/mmd.c \
+			examples/mmd.h \
+			examples/pdf2text.c \
+			examples/pdfioinfo.c
+
+
+# Make everything
+all:		$(TARGETS)
+
+
+# Clean everything
+clean:
+	rm -f $(TARGETS) $(OBJS)
+
+
+# Install everything
+install:	$(TARGETS)
+	echo Installing header files to $(BUILDROOT)$(includedir)...
+	$(INSTALL) -d -m 755 $(BUILDROOT)$(includedir)
+	for file in $(PUBHEADERS); do \
+		$(INSTALL) -c -m 644 $$file $(BUILDROOT)$(includedir); \
+	done
+	echo Installing library files to $(BUILDROOT)$(libdir)...
+	$(INSTALL) -d -m 755 $(BUILDROOT)$(libdir)
+	if test "x$(LIBPDFIO_STATIC)" != x; then \
+		$(INSTALL) -c -m 644 $(LIBPDFIO_STATIC) $(BUILDROOT)$(libdir); \
+		$(RANLIB) $(BUILDROOT)$(libdir)/$(LIBPDFIO_STATIC); \
+	fi
+	if test "x$(LIBPDFIO)" = xlibpdfio.so.1; then \
+		$(INSTALL) -c -m 755 libpdfio.so.1 $(BUILDROOT)$(libdir); \
+		ln -sf libpdfio.so.1 $(BUILDROOT)$(libdir)/libpdfio.so; \
+	elif test "x$(LIBPDFIO)" = xlibpdfio.1.dylib; then \
+		$(INSTALL) -c -m 755 libpdfio.1.dylib $(BUILDROOT)$(libdir); \
+		codesign -s "$(CODESIGN_IDENTITY)" -o runtime --timestamp $(BUILDROOT)$(libdir)/libpdfio.1.dylib; \
+		ln -sf libpdfio.1.dylib $(BUILDROOT)$(libdir)/libpdfio.dylib; \
+	else \
+		$(INSTALL) -c -m 644 $(LIBPDFIO) $(BUILDROOT)$(libdir); \
+		$(RANLIB) $(BUILDROOT)$(libdir)/$(LIBPDFIO); \
+	fi
+	echo Installing pkg-config files to $(BUILDROOT)$(libdir)/pkgconfig...
+	$(INSTALL) -d -m 755 $(BUILDROOT)$(libdir)/pkgconfig
+	$(INSTALL) -c -m 644 pdfio.pc $(BUILDROOT)$(libdir)/pkgconfig
+	echo Installing documentation to $(BUILDROOT)$(datadir)/doc/pdfio...
+	$(INSTALL) -d -m 755 $(BUILDROOT)$(datadir)/doc/pdfio
+	for file in $(DOCFILES); do \
+		$(INSTALL) -c -m 644 $$file $(BUILDROOT)$(datadir)/doc/pdfio; \
+	done
+	echo Installing examples to $(BUILDROOT)$(datadir)/doc/pdfio/examples...
+	$(INSTALL) -d -m 755 $(BUILDROOT)$(datadir)/doc/pdfio/examples
+	for file in $(EXAMPLES); do \
+		$(INSTALL) -c -m 644 $$file $(BUILDROOT)$(datadir)/doc/pdfio/examples; \
+	done
+	echo Installing man page to $(BUILDROOT)$(mandir)/man3...
+	$(INSTALL) -d -m 755 $(BUILDROOT)$(mandir)/man3
+	$(INSTALL) -c -m 644 doc/pdfio.3 $(BUILDROOT)$(mandir)/man3
+
+
+# Test everything
+test:	testpdfio testttf
+	./testttf 2>test.log
+	./testpdfio 2>>test.log
+	LANG=fr_FR.UTF-8 ./testpdfio 2>>test.log
+
+
+valgrind:	testpdfio
+	valgrind --leak-check=full ./testpdfio
+
+
+# pdfio library
+libpdfio.a:		$(LIBOBJS)
+	echo Archiving $@...
+	$(RM) $@
+	$(AR) $(ARFLAGS) $@ $(LIBOBJS)
+	$(RANLIB) $@
+
+libpdfio.so.1:		$(LIBOBJS)
+	echo Linking $@...
+	$(CC) $(DSOFLAGS) -shared -o $@ -Wl,-soname,$@ $(LIBOBJS) $(LIBS)
+
+libpdfio.1.dylib:	$(LIBOBJS)
+	echo Linking $@...
+	$(CC) $(DSOFLAGS) -dynamiclib -o $@ -install_name $(libdir)/$@ -current_version $(PDFIO_VERSION_MAJOR).$(PDFIO_VERSION_MINOR) -compatibility_version 1.0 $(LIBOBJS) $(LIBS)
+
+
+# pdfio1.def (Windows DLL exports file...)
+#
+# I'd love to use __declspec(dllexport) but MS puts it before the function
+# declaration instead of after like everyone else, and it breaks Codedoc and
+# other tools I rely on...
+pdfio1.def: $(LIBOBJS) Makefile
+	echo Generating $@...
+	echo "LIBRARY pdfio1" >$@
+	echo "VERSION $(PDFIO_VERSION_MAJOR).$(PDFIO_VERSION_MINOR)" >>$@
+	echo "EXPORTS" >>$@
+	nm $(LIBOBJS) 2>/dev/null | grep "T _" | awk '{print $$3}' | \
+		grep -v '^_ttf' | sed -e '1,$$s/^_//' | sort >>$@
+
+
+# pdfio test program
+testpdfio:		testpdfio.o libpdfio.a
+	echo Linking $@...
+	$(CC) $(LDFLAGS) -o $@ testpdfio.o libpdfio.a $(LIBS)
+
+
+# TTF test program
+testttf:	ttf.o testttf.o
+	echo Linking $@...
+	$(CC) $(LDFLAGS) -o testttf ttf.o testttf.o $(LIBS)
+
+
+# Dependencies
+$(OBJS):		pdfio.h pdfio-private.h Makefile
+pdfio-content.o:	pdfio-content.h ttf.h
+testttf.o:		ttf.h
+ttf.o:			ttf.h
+
+
+# Make documentation using Codedoc <https://www.msweet.org/codedoc>
+DOCFLAGS	=	\
+			--author "Michael R Sweet" \
+			--copyright "Copyright (c) 2021-2025 by Michael R Sweet" \
+			--docversion $(PDFIO_VERSION)
+
+.PHONY: doc
+doc:
+	echo Generating documentation...
+	codedoc $(DOCFLAGS) --title "PDFio Programming Manual v$(PDFIO_VERSION)" $(PUBHEADERS) $(PUBOBJS:.o=.c) --body doc/pdfio.md --coverimage doc/pdfio-512.png pdfio.xml >doc/pdfio.html
+	codedoc $(DOCFLAGS) --title "PDFio Programming Manual v$(PDFIO_VERSION)" --body doc/pdfio.md --coverimage doc/pdfio-epub.png pdfio.xml --epub doc/pdfio.epub
+	codedoc $(DOCFLAGS) --title "pdf read/write library" --man pdfio --section 3 --body doc/pdfio.md pdfio.xml >doc/pdfio.3
+	rm -f pdfio.xml
+
+
+# Fuzz-test the library <https://lcamtuf.coredump.cx/afl/>
+.PHONY: afl
+afl:
+	$(MAKE) -$(MAKEFLAGS) CC="afl-clang-fast" COMMONFLAGS="-g" clean all
+	test afl-output || rm -rf afl-output
+	afl-fuzz -x afl-pdf.dict -i afl-input -o afl-output -V 600 -e pdf -t 5000 ./testpdfio @@
+
+
+# Analyze code with the Clang static analyzer <https://clang-analyzer.llvm.org>
+clang:
+	clang $(CPPFLAGS) --analyze $(OBJS:.o=.c) 2>clang.log
+	rm -rf $(OBJS:.o=.plist)
+	test -s clang.log && (echo "$(GHA_ERROR)Clang detected issues."; echo ""; cat clang.log; exit 1) || exit 0
+
+
+# Analyze code using Cppcheck <http://cppcheck.sourceforge.net>
+cppcheck:
+	cppcheck $(CPPFLAGS) --template=gcc --suppressions-list=.cppcheck $(OBJS:.o=.c) 2>cppcheck.log
+	test -s cppcheck.log && (echo "$(GHA_ERROR)Cppcheck detected issues."; echo ""; cat cppcheck.log; exit 1) || exit 0

NOTICE

@@ -1,6 +1,6 @@
 PDFio - PDF Read/Write Library
 
-Copyright © 2021-2023 by Michael R Sweet.
+Copyright © 2021-2025 by Michael R Sweet.
 
 (Optional) Exceptions to the Apache 2.0 License:
 ================================================

README.md

@@ -28,7 +28,7 @@ PDFio requires the following to build the software:
 
 - A C99 compiler such as Clang, GCC, or MS Visual C
 - A POSIX-compliant `make` program
-- ZLIB (<https://www.zlib.net>) 1.0 or higher
+- ZLIB (<https://www.zlib.net>) 1.1 or higher
 
 IDE files for Xcode (macOS/iOS) and Visual Studio (Windows) are also provided.
 
@@ -36,15 +36,27 @@ IDE files for Xcode (macOS/iOS) and Visual Studio (Windows) are also provided.
 Documentation
 -------------
 
-See the man page (`pdfio.3`), frequently ask questions (`FAQ.md`), and full HTML
-documentation (`pdfio.html`) for information on using PDFio.
+See the man page (`pdfio.3`) and full HTML documentation (`pdfio.html`) for
+information on using PDFio.
 
 
-Installing pdfio
+Installing PDFio
 ----------------
 
-PDFio comes with a portable makefile that will work on any POSIX-compliant
-system with ZLIB installed.  To make it, run:
+PDFio uses a configure script on Unix systems to generate a makefile:
+
+    ./configure
+
+If you want a shared library, run:
+
+    ./configure --enable-shared
+
+The default installation location is "/usr/local".  Pass the `--prefix` option
+to make to install it to another location:
+
+    ./configure --prefix=/some/other/directory
+
+Once configured, run the following to make the library:
 
     make all
 
@@ -54,45 +66,7 @@ To test it, run:
 
 To install it, run:
 
-    make install
-
-If you want a shared library, run:
-
-    make all-shared
-    make install-shared
-
-The default installation location is "/usr/local".  Pass the `prefix` variable
-to make to install it to another location:
-
-    make install prefix=/some/other/directory
-
-The makefile installs the pdfio header to "${prefix}/include", the library to
-"${prefix}/lib", the `pkg-config` file to "${prefix}/lib/pkgconfig", the man
-page to "${prefix}/share/man/man3", and the documentation to
-"${prefix}/share/doc/pdfio".
-
-The makefile supports the following variables that can be specified in the make
-command or as environment variables:
-
-- `AR`: the library archiver (default "ar")
-- `ARFLAGS`: options for the library archiver (default "cr")
-- `CC`: the C compiler (default "cc")
-- `CFLAGS`: options for the C compiler (default "")
-- `CODESIGN_IDENTITY`: the identity to use when code signing the shared library
-  on macOS (default "Developer ID")
-- `COMMONFLAGS`: options for the C compiler and linker (typically architecture
-  and optimization options, default is "-Os -g")
-- `CPPFLAGS`: options for the C preprocessor (default "")
-- `DESTDIR` and `DSTROOT`: specifies a root directory when installing
-  (default is "", specify only one)
-- `DSOFLAGS`: options for the C compiler when linking the shared library
-  (default "")
-- `LDFLAGS`: options for the C compiler when linking the test programs
-  (default "")
-- `LIBS`: library options when linking the test programs (default "-lz")
-- `RANLIB`: program that generates a table-of-contents in a library
-  (default "ranlib")
-- `prefix`: specifies the installation directory (default "/usr/local")
+    sudo make install
 
 
 Visual Studio Project
@@ -111,15 +85,11 @@ generates a static library that will be installed under "/usr/local" with:
 
     sudo xcodebuild install
 
-You can reproduce this with the makefile using:
-
-    sudo make macos install
-
 
 Legal Stuff
 -----------
 
-PDFio is Copyright © 2021-2023 by Michael R Sweet.
+PDFio is Copyright © 2021-2025 by Michael R Sweet.
 
 This software is licensed under the Apache License Version 2.0 with an
 (optional) exception to allow linking against GPL2/LGPL2 software.  See the

SECURITY.md

@@ -54,7 +54,7 @@ starting at 0.  A feature release has a "PATCH" value of 0, for example:
     1.1.0
     2.0.0
 
-Beta releases and release candidates are *not* prodution releases and use
+Beta releases and release candidates are *not* production releases and use
 semantic version numbers of the form:
 
     MAJOR.MINORbNUMBER

configure.ac

@@ -0,0 +1,320 @@
+dnl
+dnl Configuration script for PDFio
+dnl
+dnl Copyright © 2023-2025 by Michael R Sweet
+dnl
+dnl Licensed under Apache License v2.0.  See the file "LICENSE" for more
+dnl information.
+dnl
+
+dnl ***********************************************************************
+dnl
+dnl Note: Using autoheader or automake on this project will break the PDFio
+dnl build system.  Use "autoconf -f" to regenerate the configure script if
+dnl you make changes to this file.
+dnl
+dnl ***********************************************************************
+
+
+dnl We need at least autoconf 2.70 for --runstatedir...
+AC_PREREQ([2.70])
+
+
+dnl Package name and version...
+AC_INIT([pdfio], [1.5.2], [https://github.com/michaelrsweet/pdfio/issues], [pdfio], [https://www.msweet.org/pdfio])
+
+PDFIO_VERSION="AC_PACKAGE_VERSION"
+PDFIO_VERSION_MAJOR="`echo AC_PACKAGE_VERSION | awk -F. '{print $1}'`"
+PDFIO_VERSION_MINOR="`echo AC_PACKAGE_VERSION | awk -F. '{printf("%d\n",$2);}'`"
+AC_SUBST([PDFIO_VERSION])
+AC_SUBST([PDFIO_VERSION_MAJOR])
+AC_SUBST([PDFIO_VERSION_MINOR])
+
+
+dnl This line is provided to ensure that you don't run the autoheader program
+dnl against this project.  Doing so is completely unsupported and WILL cause
+dnl problems!
+AH_TOP([#error "Somebody ran autoheader on this project which is unsupported and WILL cause problems."])
+
+
+dnl Get the build and host platforms and split the host_os value
+AC_CANONICAL_BUILD
+AC_CANONICAL_HOST
+
+[host_os_name="$(echo $host_os | sed -e '1,$s/[0-9.]*$//g')"]
+[host_os_version="$(echo $host_os | sed -e '1,$s/^[^0-9.]*//g' | awk -F. '{print $1 $2}')"]
+# Linux often does not yield an OS version we can use...
+AS_IF([test "x$host_os_version" = x], [
+    host_os_version="0"
+])
+
+
+dnl Compiler options...
+CFLAGS="${CFLAGS:=}"
+CPPFLAGS="${CPPFLAGS:=}"
+DSOFLAGS="${DSOFLAGS:=}"
+LDFLAGS="${LDFLAGS:=}"
+LIBS="${LIBS:=}"
+OPTIM="${OPTIM:=}"
+
+AC_SUBST([DSOFLAGS])
+AC_SUBST([OPTIM])
+
+
+dnl Standard programs...
+AC_PROG_CC
+AC_PROG_RANLIB
+AC_PATH_PROG([AR], [ar])
+AC_PATH_PROGS([CODE_SIGN], [codesign true])
+AC_PATH_PROG([MKDIR], [mkdir])
+AC_PATH_PROG([RM], [rm])
+AC_PATH_PROG([RMDIR], [rmdir])
+AC_PATH_PROG([LN], [ln])
+
+
+dnl Figure out the correct "ar" command flags...
+AS_IF([test "$ac_cv_prog_ranlib" = ":"], [
+    ARFLAGS="crs"
+], [
+    ARFLAGS="cr"
+])
+AC_SUBST([ARFLAGS])
+
+
+dnl install-sh
+AC_MSG_CHECKING([for install-sh script])
+INSTALL="$(pwd)/install-sh"
+AC_SUBST([INSTALL])
+AC_MSG_RESULT([using $INSTALL])
+
+
+dnl Check for date/time functionality...
+AC_CHECK_FUNC([timegm], [
+    AC_DEFINE([HAVE_TIMEGM], [1], [Do we have the timegm function?])
+    CPPFLAGS="-DHAVE_TIMEGM=1 $CPPFLAGS"
+])
+
+AC_MSG_CHECKING([for tm_gmtoff member in tm structure])
+AC_COMPILE_IFELSE([
+    AC_LANG_PROGRAM([[#include <time.h>]], [[
+        struct tm t;
+	int o = t.tm_gmtoff;
+    ]])
+], [
+    AC_MSG_RESULT([yes])
+    AC_DEFINE([HAVE_TM_GMTOFF], [1], [Have tm_gmtoff member in struct tm?])
+    CPPFLAGS="-DHAVE_TM_GMTOFF=1 $CPPFLAGS"
+], [
+    AC_MSG_RESULT([no])
+])
+
+
+dnl Check for pkg-config, which is used for some other tests later on...
+AC_PATH_TOOL([PKGCONFIG], [pkg-config])
+
+PKGCONFIG_CFLAGS="-I\${includedir}"
+PKGCONFIG_LIBS="-L\${libdir} -lpdfio"
+PKGCONFIG_LIBS_PRIVATE="-lm"
+PKGCONFIG_REQUIRES="zlib"
+AC_SUBST([PKGCONFIG_CFLAGS])
+AC_SUBST([PKGCONFIG_LIBS])
+AC_SUBST([PKGCONFIG_LIBS_PRIVATE])
+AC_SUBST([PKGCONFIG_REQUIRES])
+
+
+dnl ZLIB
+AC_MSG_CHECKING([for zlib via pkg-config])
+AS_IF([$PKGCONFIG --exists zlib], [
+    AC_MSG_RESULT([yes])
+    CPPFLAGS="$($PKGCONFIG --cflags zlib) $CPPFLAGS"
+    LIBS="$($PKGCONFIG --libs zlib) $LIBS"
+],[
+    AC_MSG_RESULT([no])
+    AC_CHECK_HEADER([zlib.h])
+    AC_CHECK_LIB([z], [inflateCopy])
+
+    AS_IF([test x$ac_cv_header_zlib_h != xyes -o x$ac_cv_lib_z_inflateCopy != xyes], [
+	AC_MSG_ERROR([Sorry, this software requires zlib 1.1 or higher.])
+    ])
+
+    PKGCONFIG_REQUIRES=""
+    PKGCONFIG_LIBS_PRIVATE="-lz $PKGCONFIG_LIBS_PRIVATE"
+])
+
+
+dnl libpng...
+AC_ARG_ENABLE([libpng], AS_HELP_STRING([--enable-libpng], [use libpng for pdfioFileCreateImageObjFromFile, default=auto]))
+
+PKGCONFIG_LIBPNG=""
+AC_SUBST([PKGCONFIG_LIBPNG])
+
+AS_IF([test "x$PKGCONFIG" != x -a x$enable_libpng != xno], [
+    AC_MSG_CHECKING([for libpng-1.6.x])
+    AS_IF([$PKGCONFIG --exists libpng16], [
+	AC_MSG_RESULT([yes]);
+	AC_DEFINE([HAVE_LIBPNG], 1, [Have PNG library?])
+	CPPFLAGS="$($PKGCONFIG --cflags libpng16) -DHAVE_LIBPNG=1 $CPPFLAGS"
+	LIBS="$($PKGCONFIG --libs libpng16) -lz $LIBS"
+	PKGCONFIG_LIBS_PRIVATE="$($PKGCONFIG --libs libpng16) $PKGCONFIG_LIBS_PRIVATE"
+	PKGCONFIG_REQUIRES="libpng >= 1.6,$PKGCONFIG_REQUIRES"
+    ], [
+	AC_MSG_RESULT([no]);
+	AS_IF([test x$enable_libpng = xyes], [
+	    AC_MSG_ERROR([libpng-dev 1.6 or later required for --enable-libpng.])
+	])
+    ])
+], [test x$enable_libpng = xyes], [
+    AC_MSG_ERROR([libpng-dev 1.6 or later required for --enable-libpng.])
+])
+
+
+dnl Library target...
+AC_ARG_ENABLE([static], AS_HELP_STRING([--disable-static], [do not install static library]))
+AC_ARG_ENABLE([shared], AS_HELP_STRING([--enable-shared], [install shared library]))
+
+AS_IF([test x$enable_shared = xyes], [
+    AS_IF([test "$host_os_name" = darwin], [
+	LIBPDFIO="libpdfio.1.dylib"
+    ], [
+	LIBPDFIO="libpdfio.so.1"
+    ])
+
+    AS_IF([test x$enable_static != xno], [
+        LIBPDFIO_STATIC="libpdfio.a"
+    ], [
+	LIBPDFIO_STATIC=""
+    ])
+], [
+    LIBPDFIO="libpdfio.a"
+    LIBPDFIO_STATIC=""
+    PKGCONFIG_LIBS="$PKGCONFIG_LIBS $PKGCONFIG_LIBS_PRIVATE"
+    PKGCONFIG_LIBS_PRIVATE=""
+])
+
+AC_SUBST([LIBPDFIO])
+AC_SUBST([LIBPDFIO_STATIC])
+
+
+dnl Extra compiler options...
+AC_ARG_ENABLE([debug], AS_HELP_STRING([--enable-debug], [turn on debugging, default=no]))
+AC_ARG_ENABLE([maintainer], AS_HELP_STRING([--enable-maintainer], [turn on maintainer mode, default=no]))
+AC_ARG_ENABLE([sanitizer], AS_HELP_STRING([--enable-sanitizer], [build with AddressSanitizer, default=no]))
+
+AS_IF([test x$enable_debug = xyes], [
+    OPTIM="$OPTIM -g"
+    CSFLAGS=""
+], [
+    OPTIM="$OPTIM -g -Os"
+    CSFLAGS="-o runtime"
+])
+
+AC_SUBST([CSFLAGS])
+
+WARNINGS=""
+AC_SUBST([WARNINGS])
+
+AS_IF([test -n "$GCC"], [
+    AS_IF([test x$enable_sanitizer = xyes], [
+	# Use -fsanitize=address with debugging...
+	OPTIM="$OPTIM -fsanitize=address"
+    ], [
+	# Otherwise use the Fortify enhancements to catch any unbounded
+	# string operations...
+	CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"
+    ])
+
+    dnl Show all standard warnings + unused variables when compiling...
+    WARNINGS="-Wall -Wunused"
+
+    dnl Drop some not-useful/unreliable warnings...
+    for warning in char-subscripts format-truncation format-y2k switch unused-result; do
+	AC_MSG_CHECKING([whether compiler supports -Wno-$warning])
+
+	OLDCFLAGS="$CFLAGS"
+	CFLAGS="$CFLAGS -Wno-$warning -Werror"
+
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [
+	    AC_MSG_RESULT(yes)
+	    WARNINGS="$WARNINGS -Wno-$warning"
+        ], [
+	    AC_MSG_RESULT(no)
+	])
+
+	CFLAGS="$OLDCFLAGS"
+    done
+
+    dnl Maintainer mode enables -Werror...
+    AS_IF([test x$enable_maintainer = xyes], [
+	WARNINGS="$WARNINGS -Werror -Wno-error=deprecated"
+    ])
+
+    dnl See if PIE options are supported...
+    AC_MSG_CHECKING(whether compiler supports -fPIE)
+    OLDCFLAGS="$CFLAGS"
+    AS_CASE(["$host_os_name"],
+    [darwin*], [
+	CFLAGS="$CFLAGS -fPIC -fPIE -Wl,-pie"
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[
+	    OLDCFLAGS="-fPIC $OLDCFLAGS"
+	    LDFLAGS="-fPIE -Wl,-pie $LDFLAGS"
+	    AC_MSG_RESULT(yes)
+	],[
+	    AC_MSG_RESULT(no)
+	])
+    ], [*], [
+	CFLAGS="$CFLAGS -fPIC -fPIE -pie"
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[
+	    OLDCFLAGS="-fPIC $OLDCFLAGS"
+	    LDFLAGS="-fPIE -pie $LDFLAGS"
+	    AC_MSG_RESULT(yes)
+	],[
+	    AC_MSG_RESULT(no)
+	])
+    ])
+    CFLAGS="$OLDCFLAGS"
+
+    dnl OS-specific compiler options...
+    AC_MSG_CHECKING([for OS-specific compiler options])
+    AS_CASE(["$host_os_name"], [linux*], [
+    	# Make sure we get the full set of 64-bit Linux APIs from the headers...
+	CPPFLAGS="$CPPFLAGS -D__USE_MISC -D_GNU_SOURCE -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64"
+
+	# Mark read-only sections as relocatable to random addresses...
+	LDFLAGS="$LDFLAGS -Wl,-z,relro,-z,now"
+
+        AC_MSG_RESULT([-D__USE_MISC -D_GNU_SOURCE -D_TIME_BITS=64 -D_FILE_OFFSET_BITS=64 -Wl,-z,relro,-z,now])
+    ], [darwin*], [
+        # When not building for debug, target macOS 11 or later, "universal"
+        # binaries when possible...
+        AS_IF([echo "$CPPFLAGS $CFLAGS $LDFLAGS $OPTIM" | grep -q "\\-arch "], [
+            # Don't add architecture/min-version flags if they are already present
+            AC_MSG_RESULT([none])
+        ], [echo "$CPPFLAGS $CFLAGS $LDFLAGS $OPTIM" | grep -q "\\-mmacosx-version-"], [
+            # Don't add architecture/min-version flags if they are already present
+            AC_MSG_RESULT([none])
+        ], [test "$host_os_version" -ge 200 -a x$enable_debug != xyes], [
+	    # macOS 11.0 and higher support the Apple Silicon (arm64) CPUs
+	    OPTIM="$OPTIM -mmacosx-version-min=11.0 -arch x86_64 -arch arm64"
+            AC_MSG_RESULT([-mmacosx-version-min=11.0 -arch x86_64 -arch arm64])
+	], [
+	    # Don't add architecture/min-version flags if debug enabled
+            AC_MSG_RESULT([none])
+	])
+    ], [*], [
+        AC_MSG_RESULT([none])
+    ])
+])
+
+
+dnl Extra linker options...
+AC_ARG_WITH([dsoflags], AS_HELP_STRING([--with-dsoflags=...], [Specify additional DSOFLAGS]), [
+    DSOFLAGS="$withval $DSOFLAGS"
+])
+AC_ARG_WITH([ldflags], AS_HELP_STRING([--with-ldflags=...], [Specify additional LDFLAGS]), [
+    LDFLAGS="$withval $LDFLAGS"
+])
+
+
+dnl Generate the Makefile and pkg-config file...
+AC_CONFIG_FILES([Makefile pdfio.pc])
+AC_OUTPUT

examples/Makefile

@@ -0,0 +1,71 @@
+#
+# Makefile for PDFio examples.
+#
+# Copyright © 2024-2025 by Michael R Sweet.
+#
+# Licensed under Apache License v2.0.  See the file "LICENSE" for more
+# information.
+#
+
+# POSIX makefile
+.POSIX:
+
+
+# Common options
+CFLAGS		=	-g $(CPPFLAGS)
+#CFLAGS		=	-g -fsanitize=address $(CPPFLAGS)
+CPPFLAGS	=	-I.. $(shell PKG_CONFIG_PATH="..:$(PKG_CONFIG_PATH)" pkg-config pdfio --cflags)
+LIBS		=	-L.. $(shell PKG_CONFIG_PATH="..:$(PKG_CONFIG_PATH)" pkg-config pdfio --libs)
+
+
+# Targets
+TARGETS		=	\
+			code128 \
+			image2pdf \
+			md2pdf \
+			pdf2text \
+			pdfioinfo \
+			pdfiomerge
+
+
+# Make everything
+all:	$(TARGETS)
+
+
+# Clean everything
+clean:
+	rm -f $(TARGETS)
+
+
+# code128
+code128:	code128.c
+	$(CC) $(CFLAGS) -o $@ code128.c $(LIBS)
+
+
+# image2pdf
+image2pdf:	image2pdf.c
+	$(CC) $(CFLAGS) -o $@ image2pdf.c $(LIBS)
+
+
+# md2pdf
+md2pdf:		md2pdf.c mmd.c mmd.h
+	$(CC) $(CFLAGS) -o $@ md2pdf.c mmd.c $(LIBS)
+
+
+# pdfio text extraction (demo, doesn't handle a lot of things yet)
+pdf2text:	pdf2text.c
+	$(CC) $(CFLAGS) -o $@ pdf2text.c $(LIBS)
+
+
+# pdfioinfo
+pdfioinfo:	pdfioinfo.c
+	$(CC) $(CFLAGS) -o $@ pdfioinfo.c $(LIBS)
+
+
+# pdfiomerge
+pdfiomerge:	pdfiomerge.c
+	$(CC) $(CFLAGS) -o $@ pdfiomerge.c $(LIBS)
+
+
+# Common dependencies...
+$(TARGETS):	Makefile ../pdfio.h ../pdfio-content.h

examples/Roboto-LICENSE.txt

@@ -0,0 +1,93 @@
+Copyright 2011 The Roboto Project Authors (https://github.com/googlefonts/roboto-classic)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

examples/code128-LICENSE.txt

@@ -0,0 +1,343 @@
+Copyright 2003 Grandzebu, All Rights Reserved
+
+http://grandzebu.net/informatique/codbar-en/code128.htm
+
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
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+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
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+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
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+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
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+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
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+You are not responsible for enforcing compliance by third parties to
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+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
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+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
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+
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+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
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+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
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+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
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+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
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+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

examples/code128.c

@@ -0,0 +1,208 @@
+//
+// Code 128 barcode example for PDFio.
+//
+// Copyright © 2024 by Michael R Sweet.
+//
+// Licensed under Apache License v2.0.  See the file "LICENSE" for more
+// information.
+//
+// Usage:
+//
+//   ./code128 "BARCODE" ["TEXT"] >FILENAME.pdf
+//
+
+#include <pdfio.h>
+#include <pdfio-content.h>
+
+
+//
+// 'make_code128()' - Make a Code 128 barcode string.
+//
+// This function produces a Code B (printable ASCII) representation of the
+// source string and doesn't try to optimize using Code C.  Non-printable and
+// extended characters are ignored in the source string.
+//
+
+static char *				// O - Output string
+make_code128(char       *dst,		// I - Destination buffer
+             const char *src,		// I - Source string
+             size_t     dstsize)	// I - Size of destination buffer
+{
+  char		*dstptr,		// Pointer into destination buffer
+		*dstend;		// End of destination buffer
+  int		sum;			// Weighted sum
+  static const char *code128_chars =	// Code 128 characters
+		" !\"#$%&'()*+,-./0123456789:;<=>?"
+		"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"
+		"`abcdefghijklmnopqrstuvwxyz{|}~\303"
+		"\304\305\306\307\310\311\312";
+  static const char code128_fnc_3 = '\304';
+					// FNC 3
+  static const char code128_fnc_2 = '\305';
+					// FNC 2
+  static const char code128_shift_b = '\306';
+					// Shift B (for lowercase)
+  static const char code128_code_c = '\307';
+					// Code C
+  static const char code128_code_b = '\310';
+					// Code B
+  static const char code128_fnc_4 = '\311';
+					// FNC 4
+  static const char code128_fnc_1 = '\312';
+					// FNC 1
+  static const char code128_start_code_a = '\313';
+					// Start code A
+  static const char code128_start_code_b = '\314';
+					// Start code B
+  static const char code128_start_code_c = '\315';
+					// Start code C
+  static const char code128_stop = '\316';
+					// Stop pattern
+
+
+  // Start a Code B barcode...
+  dstptr = dst;
+  dstend = dst + dstsize - 3;
+
+  *dstptr++ = code128_start_code_b;
+  sum       = code128_start_code_b - 100;
+
+  while (*src && dstptr < dstend)
+  {
+    if (*src >= ' ' && *src < 0x7f)
+    {
+      sum       += (dstptr - dst) * (*src - ' ');
+      *dstptr++ = *src;
+    }
+
+    src ++;
+  }
+
+  // Add the weighted sum modulo 103
+  *dstptr++ = code128_chars[sum % 103];
+
+  // Add the stop pattern and return...
+  *dstptr++ = code128_stop;
+  *dstptr   = '\0';
+
+  return (dst);
+}
+
+
+//
+// 'output_cb()' - Write PDF data to the standard output...
+//
+
+static ssize_t				// O - Number of bytes written
+output_cb(void       *output_cbdata,	// I - Callback data (not used)
+          const void *buffer,		// I - Buffer to write
+          size_t     bytes)		// I - Number of bytes to write
+{
+  (void)output_cbdata;
+
+  return ((ssize_t)fwrite(buffer, 1, bytes, stdout));
+}
+
+
+//
+// 'main()' - Produce a single-page barcode file.
+//
+
+int					// O - Exit status
+main(int  argc,				// I - Number of command-line arguments
+     char *argv[])			// I - Command-line arguments
+{
+  const char	*barcode,		// Barcode to show
+		*text;			// Text to display under barcode
+  pdfio_file_t	*pdf;			// Output PDF file
+  pdfio_obj_t	*barcode_font;		// Barcode font object
+  pdfio_obj_t	*text_font = NULL;	// Text font object
+  pdfio_dict_t	*page_dict;		// Page dictionary
+  pdfio_rect_t	media_box;		// Media/CropBox for page
+  pdfio_stream_t *page_st;		// Page stream
+  char		barcode_temp[256];	// Barcode buffer
+  double	barcode_height = 36.0,	// Height of barcode
+		barcode_width,		// Width of barcode
+		text_height = 0.0,	// Height of text
+		text_width = 0.0;	// Width of text
+
+
+  // Get the barcode and optional text from the command-line...
+  if (argc < 2 || argc > 3)
+  {
+    fputs("Usage: code128 \"BARCODE\" [\"TEXT\"] >FILENAME.pdf\n", stderr);
+    return (1);
+  }
+
+  barcode = argv[1];
+  text    = argv[2];
+
+  // Output a PDF file to the standard output...
+#ifdef _WIN32
+  setmode(1, O_BINARY);			// Force binary output on Windows
+#endif // _WIN32
+
+  if ((pdf = pdfioFileCreateOutput(output_cb, /*output_cbdata*/NULL, /*version*/NULL, /*media_box*/NULL, /*crop_box*/NULL, /*error_cb*/NULL, /*error_data*/NULL)) == NULL)
+    return (1);
+
+  // Load fonts...
+  barcode_font = pdfioFileCreateFontObjFromFile(pdf, "code128.ttf", /*unicode*/false);
+  if (text)
+    text_font = pdfioFileCreateFontObjFromBase(pdf, "Helvetica");
+
+  // Generate Code128 characters for the desired barcode...
+  if (!(barcode[0] & 0x80))
+    barcode = make_code128(barcode_temp, barcode, sizeof(barcode_temp));
+
+  // Compute sizes of the text...
+  barcode_width = pdfioContentTextMeasure(barcode_font, barcode, barcode_height);
+  if (text && text_font)
+  {
+    text_height = 9.0;
+    text_width  = pdfioContentTextMeasure(text_font, text, text_height);
+  }
+
+  // Compute the size of the PDF page...
+  media_box.x1 = 0.0;
+  media_box.y1 = 0.0;
+  media_box.x2 = (barcode_width > text_width ? barcode_width : text_width) + 18.0;
+  media_box.y2 = barcode_height + text_height + 18.0;
+
+  // Start a page for the barcode...
+  page_dict = pdfioDictCreate(pdf);
+
+  pdfioDictSetRect(page_dict, "MediaBox", &media_box);
+  pdfioDictSetRect(page_dict, "CropBox", &media_box);
+
+  pdfioPageDictAddFont(page_dict, "B128", barcode_font);
+  if (text_font)
+    pdfioPageDictAddFont(page_dict, "TEXT", text_font);
+
+  page_st = pdfioFileCreatePage(pdf, page_dict);
+
+  // Draw the page...
+  pdfioContentSetFillColorGray(page_st, 0.0);
+
+  pdfioContentSetTextFont(page_st, "B128", barcode_height);
+  pdfioContentTextBegin(page_st);
+  pdfioContentTextMoveTo(page_st, 0.5 * (media_box.x2 - barcode_width), 9.0 + text_height);
+  pdfioContentTextShow(page_st, /*unicode*/false, barcode);
+  pdfioContentTextEnd(page_st);
+
+  if (text && text_font)
+  {
+    pdfioContentSetTextFont(page_st, "TEXT", text_height);
+    pdfioContentTextBegin(page_st);
+    pdfioContentTextMoveTo(page_st, 0.5 * (media_box.x2 - text_width), 9.0);
+    pdfioContentTextShow(page_st, /*unicode*/false, text);
+    pdfioContentTextEnd(page_st);
+  }
+
+  pdfioStreamClose(page_st);
+
+  // Close and return...
+  pdfioFileClose(pdf);
+
+  return (0);
+}
+

examples/image2pdf.c

@@ -0,0 +1,148 @@
+//
+// Image example for PDFio.
+//
+// Copyright © 2023-2025 by Michael R Sweet.
+//
+// Licensed under Apache License v2.0.  See the file "LICENSE" for more
+// information.
+//
+// Usage:
+//
+//   ./image2pdf FILENAME.{jpg,png} FILENAME.pdf ["TEXT"]
+//
+
+#include <pdfio.h>
+#include <pdfio-content.h>
+#include <string.h>
+
+
+//
+// 'create_pdf_image_file()' - Create a PDF file of an image with optional caption.
+//
+
+bool					// O - True on success, false on failure
+create_pdf_image_file(
+    const char *imagename,		// I - Image filename
+    const char *pdfname,		// I - PDF filename
+    const char *caption)		// I - Caption filename
+{
+  pdfio_file_t   *pdf;			// PDF file
+  pdfio_obj_t    *font;			// Caption font
+  pdfio_obj_t    *image;		// Image
+  pdfio_dict_t   *dict;			// Page dictionary
+  pdfio_stream_t *page;			// Page stream
+  double         width, height;		// Width and height of image
+  double         swidth, sheight;	// Scaled width and height on page
+  double         tx, ty;		// Position on page
+
+
+  // Default the caption...
+  if (!caption)
+  {
+    if ((caption = strrchr(imagename, '/')) != NULL)
+      caption ++;
+    else
+      caption = imagename;
+  }
+
+  // Create the PDF file...
+  pdf = pdfioFileCreate(pdfname, /*version*/NULL, /*media_box*/NULL,
+                        /*crop_box*/NULL, /*error_cb*/NULL,
+                        /*error_cbdata*/NULL);
+  if (!pdf)
+    return (false);
+
+  // Create a Courier base font for the caption
+  font = pdfioFileCreateFontObjFromBase(pdf, "Courier");
+
+  if (!font)
+  {
+    pdfioFileClose(pdf);
+    return (false);
+  }
+
+  // Create an image object from the JPEG/PNG image file...
+  image = pdfioFileCreateImageObjFromFile(pdf, imagename, true);
+
+  if (!image)
+  {
+    pdfioFileClose(pdf);
+    return (false);
+  }
+
+  // Create a page dictionary with the font and image...
+  dict = pdfioDictCreate(pdf);
+  pdfioPageDictAddFont(dict, "F1", font);
+  pdfioPageDictAddImage(dict, "IM1", image);
+
+  // Create the page and its content stream...
+  page = pdfioFileCreatePage(pdf, dict);
+
+  // Position and scale the image on the page...
+  width  = pdfioImageGetWidth(image);
+  height = pdfioImageGetHeight(image);
+
+  // Default media_box is "universal" 595.28x792 points (8.27x11in or
+  // 210x279mm).  Use margins of 36 points (0.5in or 12.7mm) with another
+  // 36 points for the caption underneath...
+  swidth  = 595.28 - 72.0;
+  sheight = swidth * height / width;
+  if (sheight > (792.0 - 36.0 - 72.0))
+  {
+    sheight = 792.0 - 36.0 - 72.0;
+    swidth  = sheight * width / height;
+  }
+
+  tx = 0.5 * (595.28 - swidth);
+  ty = 0.5 * (792 - 36 - sheight);
+
+  pdfioContentDrawImage(page, "IM1", tx, ty + 36.0, swidth, sheight);
+
+  // Draw the caption in black...
+  pdfioContentSetFillColorDeviceGray(page, 0.0);
+
+  // Compute the starting point for the text - Courier is monospaced
+  // with a nominal width of 0.6 times the text height...
+  tx = 0.5 * (595.28 - 18.0 * 0.6 * strlen(caption));
+
+  // Position and draw the caption underneath...
+  pdfioContentTextBegin(page);
+  pdfioContentSetTextFont(page, "F1", 18.0);
+  pdfioContentTextMoveTo(page, tx, ty);
+  pdfioContentTextShow(page, /*unicode*/false, caption);
+  pdfioContentTextEnd(page);
+
+  // Close the page stream and the PDF file...
+  pdfioStreamClose(page);
+  pdfioFileClose(pdf);
+
+  return (true);
+}
+
+
+//
+// 'main()' - Produce a single-page file from an image.
+//
+
+int					// O - Exit status
+main(int  argc,				// I - Number of command-line arguments
+     char *argv[])			// I - Command-line arguments
+{
+  const char	*imagefile,		// Image filename
+		*pdffile,		// PDF filename
+		*caption;		// Caption text
+
+
+  // Get the image file, PDF file, and optional caption text from the command-line...
+  if (argc < 3 || argc > 4)
+  {
+    fputs("Usage: image2pdf FILENAME.{jpg,png} FILENAME.pdf [\"TEXT\"]\n", stderr);
+    return (1);
+  }
+
+  imagefile = argv[1];
+  pdffile   = argv[2];
+  caption   = argv[3];
+
+  return (create_pdf_image_file(imagefile, pdffile, caption) ? 0 : 1);
+}

examples/md2pdf.md

@@ -0,0 +1,84 @@
+---
+title: Markdown to PDF Converter Test File
+...
+
+
+Markdown to PDF Converter Test File
+===================================
+
+The `md2pdf` program is organized into three source files: `md2pdf.c` which
+contains the code to format the markdown content and `mmd.h` and `mmd.c` (from
+the [Miniature Markdown Library][MMD] project) which load the markdown content.
+
+[MMD]: https://www.msweet.org/mmd/
+
+This is a test file for `md2pdf`.  Here is a bullet list:
+
+- Embed base and TrueType fonts,
+- Format text with embedded JPEG and PNG images and check boxes, with support
+  for wrapping, alignment in table cells, leader text (as used for lists), and
+  variable line height,
+- Add headers and footers, and
+- Add hyperlinks and document platform.
+
+And here is an ordered list:
+
+1. Embed base and TrueType fonts,
+2. Format text with embedded JPEG and PNG images and check boxes, with support
+   for wrapping, alignment in table cells, leader text (as used for lists), and
+   variable line height,
+3. Add headers and footers, and
+4. Add hyperlinks and document platform.
+
+
+Code Blocks
+-----------
+
+```
+0        1         2         3         4         5         6         7         8
+12345678901234567890123456789012345678901234567890123456789012345678901234567890
+```
+
+
+Images
+------
+
+PDFio book cover image:
+
+![PDFio](../doc/pdfio-epub.png)
+
+
+Tables
+------
+
+Table with leading/trailing pipes:
+
+| Heading 1 | Heading 2 | Heading 3 |
+| --------- | --------- | --------- |
+| Cell 1,1  | Cell 1,2  | Cell 1,3  |
+| Cell 2,1  | Cell 2,2  | Cell 2,3  |
+| Cell 3,1  | Cell 3,2  | Cell 3,3  |
+
+Table without leading/trailing pipes:
+
+Heading 1 | Heading 2 | Heading 3
+--------- | --------- | ---------
+Cell 1,1  | Cell 1,2  | Cell 1,3
+Cell 2,1  | Cell 2,2  | Cell 2,3
+Cell 3,1  | Cell 3,2  | Cell 3,3
+
+Table with alignment:
+
+Left Alignment | Center Alignment | Right Alignment
+:-------- | :-------: | --------:
+Cell 1,1  | Cell 1,2  |        1
+Cell 2,1  | Cell 2,2  |       12
+Cell 3,1  | Cell 3,2  |      123
+
+Table in block quote:
+
+> Heading 1 | Heading 2 | Heading 3
+> --------- | --------- | ---------
+> Cell 1,1  | Cell 1,2  | Cell 1,3
+> Cell 2,1  | Cell 2,2  | Cell 2,3
+> Cell 3,1  | Cell 3,2  | Cell 3,3

examples/mmd.h

@@ -0,0 +1,112 @@
+//
+// Header file for miniature markdown library.
+//
+//     https://www.msweet.org/mmd
+//
+// Copyright © 2017-2024 by Michael R Sweet.
+//
+// Licensed under Apache License v2.0.  See the file "LICENSE" for more
+// information.
+//
+
+#ifndef MMD_H
+#  define MMD_H
+#  include <stdio.h>
+#  include <stdbool.h>
+#  ifdef __cplusplus
+extern "C" {
+#  endif // __cplusplus
+
+
+//
+// Constants...
+//
+
+enum mmd_option_e
+{
+  MMD_OPTION_NONE = 0x00,		// No markdown extensions
+  MMD_OPTION_METADATA = 0x01,		// Jekyll metadata extension
+  MMD_OPTION_TABLES = 0x02,		// Github table extension
+  MMD_OPTION_TASKS = 0x04,		// Github task item extension (check boxes)
+  MMD_OPTION_ALL = 0x07			// All supported markdown extensions
+};
+typedef unsigned mmd_option_t;
+
+typedef enum mmd_type_e
+{
+  MMD_TYPE_NONE = -1,
+  MMD_TYPE_DOCUMENT,			// The document root
+  MMD_TYPE_METADATA,			// Document metadata
+  MMD_TYPE_BLOCK_QUOTE,			// <blockquote>
+  MMD_TYPE_ORDERED_LIST,		// <ol>
+  MMD_TYPE_UNORDERED_LIST,		// <ul>
+  MMD_TYPE_LIST_ITEM,			// <li>
+  MMD_TYPE_TABLE,			// <table>
+  MMD_TYPE_TABLE_HEADER,		// <thead>
+  MMD_TYPE_TABLE_BODY,			// <tbody>
+  MMD_TYPE_TABLE_ROW,			// <tr>
+  MMD_TYPE_HEADING_1 = 10,		// <h1>
+  MMD_TYPE_HEADING_2,			// <h2>
+  MMD_TYPE_HEADING_3,			// <h3>
+  MMD_TYPE_HEADING_4,			// <h4>
+  MMD_TYPE_HEADING_5,			// <h5>
+  MMD_TYPE_HEADING_6,			// <h6>
+  MMD_TYPE_PARAGRAPH,			// <p>
+  MMD_TYPE_CODE_BLOCK,			// <pre><code>
+  MMD_TYPE_THEMATIC_BREAK,		// <hr />
+  MMD_TYPE_TABLE_HEADER_CELL,		// <th>
+  MMD_TYPE_TABLE_BODY_CELL_LEFT,	// <td align="left">
+  MMD_TYPE_TABLE_BODY_CELL_CENTER,	// <td align="center">
+  MMD_TYPE_TABLE_BODY_CELL_RIGHT,	// <td align="right">
+  MMD_TYPE_NORMAL_TEXT = 100,		// Normal text
+  MMD_TYPE_EMPHASIZED_TEXT,		// <em>text</em>
+  MMD_TYPE_STRONG_TEXT,			// <strong>text</strong>
+  MMD_TYPE_STRUCK_TEXT,			// <del>text</del>
+  MMD_TYPE_LINKED_TEXT,			// <a href="link">text</a>
+  MMD_TYPE_CODE_TEXT,			// <code>text</code>
+  MMD_TYPE_IMAGE,			// <img src="link" />
+  MMD_TYPE_HARD_BREAK,			// <br />
+  MMD_TYPE_SOFT_BREAK,			// <wbr />
+  MMD_TYPE_METADATA_TEXT,		// name: value
+  MMD_TYPE_CHECKBOX			// [ ] or [x]
+} mmd_type_t;
+
+
+//
+// Types...
+//
+
+typedef struct _mmd_s mmd_t;		// Markdown node
+typedef size_t (*mmd_iocb_t)(void *cbdata, char *buffer, size_t bytes);
+					// mmdLoadIO callback function
+
+//
+// Functions...
+//
+
+extern char         *mmdCopyAllText(mmd_t *node);
+extern void         mmdFree(mmd_t *node);
+extern const char   *mmdGetExtra(mmd_t *node);
+extern mmd_t        *mmdGetFirstChild(mmd_t *node);
+extern mmd_t        *mmdGetLastChild(mmd_t *node);
+extern const char   *mmdGetMetadata(mmd_t *doc, const char *keyword);
+extern mmd_t        *mmdGetNextSibling(mmd_t *node);
+extern mmd_option_t mmdGetOptions(void);
+extern mmd_t        *mmdGetParent(mmd_t *node);
+extern mmd_t        *mmdGetPrevSibling(mmd_t *node);
+extern const char   *mmdGetText(mmd_t *node);
+extern mmd_type_t   mmdGetType(mmd_t *node);
+extern const char   *mmdGetURL(mmd_t *node);
+extern bool         mmdGetWhitespace(mmd_t *node);
+extern bool         mmdIsBlock(mmd_t *node);
+extern mmd_t        *mmdLoad(mmd_t *root, const char *filename);
+extern mmd_t        *mmdLoadFile(mmd_t *root, FILE *fp);
+extern mmd_t        *mmdLoadIO(mmd_t *root, mmd_iocb_t cb, void *cbdata);
+extern mmd_t        *mmdLoadString(mmd_t *root, const char *s);
+extern void         mmdSetOptions(mmd_option_t options);
+
+
+#  ifdef __cplusplus
+}
+#  endif // __cplusplus
+#endif // !MMD_H

examples/pdfioinfo.c

@@ -0,0 +1,162 @@
+//
+// PDF metadata example for PDFio.
+//
+// Copyright © 2023-2025 by Michael R Sweet.
+//
+// Licensed under Apache License v2.0.  See the file "LICENSE" for more
+// information.
+//
+// Usage:
+//
+//   ./pdfioinfo FILENAME.pdf
+//
+
+#include <pdfio.h>
+#include <time.h>
+#include <math.h>
+
+
+//
+// 'main()' - Open a PDF file and show its metadata.
+//
+
+int					// O - Exit status
+main(int  argc,				// I - Number of command-line arguments
+     char *argv[])			// Command-line arguments
+{
+  const char	*filename;		// PDF filename
+  pdfio_file_t	*pdf;			// PDF file
+  pdfio_dict_t	*catalog;		// Catalog dictionary
+  const char	*author,		// Author name
+  		*creator,		// Creator name
+  		*producer,		// Producer name
+		*title;			// Title
+  time_t	creation_date,		// Creation date
+		modification_date;	// Modification date
+  struct tm	*creation_tm,		// Creation date/time information
+		*modification_tm;	// Modification date/time information
+  char		creation_text[256],	// Creation date/time as a string
+		modification_text[256],	// Modification date/time human fmt string
+		range_text[255];	// Page range text
+  size_t	num_pages;		// PDF number of pages
+  bool		has_acroform;		// Does the file have an AcroForm?
+  pdfio_obj_t	*page;			// Object
+  pdfio_dict_t	*page_dict;		// Object dictionary
+  size_t	cur,			// Current page index
+		prev;			// Previous page index
+  pdfio_rect_t	cur_box,		// Current MediaBox
+		prev_box;		// Previous MediaBox
+
+
+  // Get the filename from the command-line...
+  if (argc != 2)
+  {
+    fputs("Usage: ./pdfioinfo FILENAME.pdf\n", stderr);
+    return (1);
+  }
+
+  filename = argv[1];
+
+  // Open the PDF file with the default callbacks...
+  pdf = pdfioFileOpen(filename, /*password_cb*/NULL,
+                      /*password_cbdata*/NULL, /*error_cb*/NULL,
+                      /*error_cbdata*/NULL);
+  if (pdf == NULL)
+    return (1);
+
+  // Get the title, author, etc...
+  catalog      = pdfioFileGetCatalog(pdf);
+  author       = pdfioFileGetAuthor(pdf);
+  creator      = pdfioFileGetCreator(pdf);
+  has_acroform = pdfioDictGetType(catalog, "AcroForm") != PDFIO_VALTYPE_NONE;
+  num_pages    = pdfioFileGetNumPages(pdf);
+  producer     = pdfioFileGetProducer(pdf);
+  title        = pdfioFileGetTitle(pdf);
+
+  // Get the creation date and convert to a string...
+  if ((creation_date = pdfioFileGetCreationDate(pdf)) > 0)
+  {
+    creation_tm   = localtime(&creation_date);
+    strftime(creation_text, sizeof(creation_text), "%c", creation_tm);
+  }
+  else
+  {
+    snprintf(creation_text, sizeof(creation_text), "-- not set --");
+  }
+
+  // Get the modification date and convert to a string...
+  if ((modification_date = pdfioFileGetModificationDate(pdf)) > 0)
+  {
+    modification_tm = localtime(&modification_date);
+    strftime(modification_text, sizeof(modification_text), "%c", modification_tm);
+  }
+  else
+  {
+    snprintf(modification_text, sizeof(modification_text), "-- not set --");
+  }
+
+  // Print file information to stdout...
+  printf("%s:\n", filename);
+  printf("           Title: %s\n", title ? title : "-- not set --");
+  printf("          Author: %s\n", author ? author : "-- not set --");
+  printf("         Creator: %s\n", creator ? creator : "-- not set --");
+  printf("        Producer: %s\n", producer ? producer : "-- not set --");
+  printf("      Created On: %s\n", creation_text);
+  printf("     Modified On: %s\n", modification_text);
+  printf("         Version: %s\n", pdfioFileGetVersion(pdf));
+  printf("        AcroForm: %s\n", has_acroform ? "Yes" : "No");
+  printf(" Number of Pages: %u\n", (unsigned)num_pages);
+
+  // Report the MediaBox for all of the pages
+  prev_box.x1 = prev_box.x2 = prev_box.y1 = prev_box.y2 = 0.0;
+
+  for (cur = 0, prev = 0; cur < num_pages; cur ++)
+  {
+    // Find the MediaBox for this page in the page tree...
+    for (page = pdfioFileGetPage(pdf, cur);
+         page != NULL;
+         page = pdfioDictGetObj(page_dict, "Parent"))
+    {
+      cur_box.x1 = cur_box.x2 = cur_box.y1 = cur_box.y2 = 0.0;
+      page_dict  = pdfioObjGetDict(page);
+
+      if (pdfioDictGetRect(page_dict, "MediaBox", &cur_box))
+        break;
+    }
+
+    // If this MediaBox is different from the previous one, show the range of
+    // pages that have that size...
+    if (cur == 0 ||
+        fabs(cur_box.x1 - prev_box.x1) > 0.01 ||
+        fabs(cur_box.y1 - prev_box.y1) > 0.01 ||
+        fabs(cur_box.x2 - prev_box.x2) > 0.01 ||
+        fabs(cur_box.y2 - prev_box.y2) > 0.01)
+    {
+      if (cur > prev)
+      {
+        snprintf(range_text, sizeof(range_text), "Pages %u-%u",
+                 (unsigned)(prev + 1), (unsigned)cur);
+        printf("%16s: [%g %g %g %g]\n", range_text,
+               prev_box.x1, prev_box.y1, prev_box.x2, prev_box.y2);
+      }
+
+      // Start a new series of pages with the new size...
+      prev     = cur;
+      prev_box = cur_box;
+    }
+  }
+
+  // Show the last range as needed...
+  if (cur > prev)
+  {
+    snprintf(range_text, sizeof(range_text), "Pages %u-%u",
+	     (unsigned)(prev + 1), (unsigned)cur);
+    printf("%16s: [%g %g %g %g]\n", range_text,
+	   prev_box.x1, prev_box.y1, prev_box.x2, prev_box.y2);
+  }
+
+  // Close the PDF file...
+  pdfioFileClose(pdf);
+
+  return (0);
+}

examples/pdfiomerge.c

@@ -0,0 +1,146 @@
+//
+// PDF merge program for PDFio.
+//
+// Copyright © 2025 by Michael R Sweet.
+//
+// Licensed under Apache License v2.0.  See the file "LICENSE" for more
+// information.
+//
+// Usage:
+//
+//   ./pdfmerge [-o OUTPUT.pdf] INPUT.pdf [... INPUT.pdf]
+//   ./pdfmerge INPUT.pdf [... INPUT.pdf] >OUTPUT.pdf
+//
+
+#include <pdfio.h>
+#include <string.h>
+
+
+//
+// Local functions...
+//
+
+static ssize_t	output_cb(void *output_cbdata, const void *buffer, size_t bytes);
+static int	usage(FILE *out);
+
+
+//
+// 'main()' - Main entry.
+//
+
+int					// O - Exit status
+main(int  argc,				// I - Number of command-line arguments
+     char *argv[])			// I - Command-line arguments
+{
+  int		i;			// Looping var
+  const char	*opt;			// Current option
+  pdfio_file_t	*inpdf,			// Input PDF file
+		*outpdf = NULL;		// Output PDF file
+
+
+  // Parse command-line...
+  for (i = 1; i < argc; i ++)
+  {
+    if (!strcmp(argv[i], "--help"))
+    {
+      return (usage(stdout));
+    }
+    else if (!strncmp(argv[i], "--", 2))
+    {
+      fprintf(stderr, "pdfmerge: Unknown option '%s'.\n", argv[i]);
+      return (usage(stderr));
+    }
+    else if (argv[i][0] == '-')
+    {
+      for (opt = argv[i] + 1; *opt; opt ++)
+      {
+        switch (*opt)
+        {
+          case 'o' : // -o OUTPUT.pdf
+              if (outpdf)
+              {
+                fputs("pdfmerge: Only one output file can be specified.\n", stderr);
+                return (usage(stderr));
+              }
+
+              i ++;
+              if (i >= argc)
+              {
+                fputs("pdfmerge: Missing output filename after '-o'.\n", stderr);
+                return (usage(stderr));
+              }
+
+              if ((outpdf = pdfioFileCreate(argv[i], /*version*/NULL, /*media_box*/NULL, /*crop_box*/NULL, /*error_cb*/NULL, /*error_data*/NULL)) == NULL)
+                return (1);
+              break;
+
+          default :
+              fprintf(stderr, "pdfmerge: Unknown option '-%c'.\n", *opt);
+              return (usage(stderr));
+        }
+      }
+    }
+    else if ((inpdf = pdfioFileOpen(argv[i], /*password_cb*/NULL, /*password_data*/NULL, /*error_cb*/NULL, /*error_data*/NULL)) == NULL)
+    {
+      return (1);
+    }
+    else
+    {
+      // Copy PDF file...
+      size_t	p,			// Current page
+		nump;			// Number of pages
+
+      if (!outpdf)
+      {
+	if ((outpdf = pdfioFileCreateOutput(output_cb, /*output_cbdata*/NULL, /*version*/NULL, /*media_box*/NULL, /*crop_box*/NULL, /*error_cb*/NULL, /*error_data*/NULL)) == NULL)
+	  return (1);
+      }
+
+      for (p = 0, nump = pdfioFileGetNumPages(inpdf); p < nump; p ++)
+      {
+        if (!pdfioPageCopy(outpdf, pdfioFileGetPage(inpdf, p)))
+          return (1);
+      }
+
+      pdfioFileClose(inpdf);
+    }
+  }
+
+  if (!outpdf)
+    return (usage(stderr));
+
+  pdfioFileClose(outpdf);
+
+  return (0);
+}
+
+
+//
+// 'output_cb()' - Write PDF data to the standard output...
+//
+
+static ssize_t				// O - Number of bytes written
+output_cb(void       *output_cbdata,	// I - Callback data (not used)
+          const void *buffer,		// I - Buffer to write
+          size_t     bytes)		// I - Number of bytes to write
+{
+  (void)output_cbdata;
+
+  return ((ssize_t)fwrite(buffer, 1, bytes, stdout));
+}
+
+
+//
+// 'usage()' - Show program usage.
+//
+
+static int				// O - Exit status
+usage(FILE *out)			// I - stdout or stderr
+{
+  fputs("Usage: pdfmerge [OPTIONS] INPUT.pdf [... INPUT.pdf] >OUTPUT.pdf\n", out);
+  fputs("Options:\n", out);
+  fputs("  --help                   Show help.\n", out);
+  fputs("  -o OUTPUT.pdf            Send output to filename instead of stdout.\n", out);
+
+  return (out == stdout ? 0 : 1);
+}

install-sh

@@ -0,0 +1,232 @@
+#!/bin/sh
+#
+# Install a program, script, or datafile.
+#
+# Copyright 2008-2012 by Apple Inc.
+#
+# This script is not compatible with BSD (or any other) install program, as it
+# allows owner and group changes to fail with a warning and makes sure that the
+# destination directory permissions are as specified - BSD install and the
+# original X11 install script did not change permissions of existing
+# directories.  It also does not support the transform options since CUPS does
+# not use them...
+#
+# Original script from X11R5 (mit/util/scripts/install.sh)
+# Copyright 1991 by the Massachusetts Institute of Technology
+#
+# Permission to use, copy, modify, distribute, and sell this software and its
+# documentation for any purpose is hereby granted without fee, provided that
+# the above copyright notice appear in all copies and that both that
+# copyright notice and this permission notice appear in supporting
+# documentation, and that the name of M.I.T. not be used in advertising or
+# publicity pertaining to distribution of the software without specific,
+# written prior permission.  M.I.T. makes no representations about the
+# suitability of this software for any purpose.  It is provided "as is"
+# without express or implied warranty.
+#
+# Calling this script install-sh is preferred over install.sh, to prevent
+# `make' implicit rules from creating a file called install from it
+# when there is no Makefile.
+
+# set DOITPROG to echo to test this script
+# Don't use :- since 4.3BSD and earlier shells don't like it.
+doit="${DOITPROG-}"
+
+# Force umask to 022...
+umask 022
+
+# put in absolute paths if you don't have them in your path; or use env. vars.
+mvprog="${MVPROG-mv}"
+cpprog="${CPPROG-cp}"
+chmodprog="${CHMODPROG-chmod}"
+chownprog="${CHOWNPROG-chown}"
+chgrpprog="${CHGRPPROG-chgrp}"
+stripprog="${STRIPPROG-strip}"
+rmprog="${RMPROG-rm}"
+mkdirprog="${MKDIRPROG-mkdir}"
+gzipprog="${GZIPPROG-gzip}"
+
+transformbasename=""
+transform_arg=""
+instcmd="$mvprog"
+chmodcmd="$chmodprog 0755"
+chowncmd=""
+chgrpcmd=""
+stripcmd=""
+rmcmd="$rmprog -f"
+mvcmd="$mvprog"
+src=""
+dst=""
+dir_arg=""
+
+gzipcp() {
+	# gzipcp from to
+	$gzipprog -9 <"$1" >"$2"
+}
+
+while [ x"$1" != x ]; do
+	case $1 in
+		-c)
+		instcmd="$cpprog"
+		shift
+		continue
+		;;
+
+		-d)
+		dir_arg=true
+		shift
+		continue
+		;;
+
+		-m)
+		chmodcmd="$chmodprog $2"
+		shift
+		shift
+		continue
+		;;
+
+		-o)
+		chowncmd="$chownprog $2"
+		shift
+		shift
+		continue
+		;;
+
+		-g)
+		chgrpcmd="$chgrpprog $2"
+		shift
+		shift
+		continue
+		;;
+
+		-s)
+		stripcmd="$stripprog"
+		shift
+		continue
+		;;
+
+		-z)
+		instcmd="gzipcp"
+		shift
+		continue
+		;;
+
+		*)
+		if [ x"$src" = x ]; then
+			src="$1"
+		else
+			dst="$1"
+		fi
+		shift
+		continue
+		;;
+	esac
+done
+
+if [ x"$src" = x ]; then
+	echo "install-sh: No input file specified"
+	exit 1
+fi
+
+if [ x"$dir_arg" != x ]; then
+	dst="$src"
+	src=""
+
+	if [ -d "$dst" ]; then
+		instcmd=:
+	else
+		instcmd=$mkdirprog
+	fi
+else
+	# Waiting for this to be detected by the "$instcmd $src $dsttmp" command
+	# might cause directories to be created, which would be especially bad
+	# if $src (and thus $dsttmp) contains '*'.
+	if [ ! -f "$src" -a ! -d "$src" ]; then
+		echo "install: $src does not exist"
+		exit 1
+	fi
+
+	if [ x"$dst" = x ]; then
+		echo "install: No destination specified"
+		exit 1
+	fi
+
+	# If destination is a directory, append the input filename.
+	if [ -d "$dst" ]; then
+		dst="$dst/`basename $src`"
+	fi
+fi
+
+## this sed command emulates the dirname command
+dstdir="`echo $dst | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`"
+
+# Make sure that the destination directory exists.
+# This part is taken from Noah Friedman's mkinstalldirs script
+
+# Skip lots of stat calls in the usual case.
+if [ ! -d "$dstdir" ]; then
+	defaultIFS='
+	'
+	IFS="${IFS-${defaultIFS}}"
+
+	oIFS="${IFS}"
+	# Some sh's can't handle IFS=/ for some reason.
+	IFS='%'
+	set - `echo ${dstdir} | sed -e 's@/@%@g' -e 's@^%@/@'`
+	IFS="${oIFS}"
+
+	pathcomp=''
+
+	while [ $# -ne 0 ] ; do
+		pathcomp="${pathcomp}${1}"
+		shift
+
+		if [ ! -d "${pathcomp}" ]; then $doit $mkdirprog "${pathcomp}"; fi
+
+		pathcomp="${pathcomp}/"
+	done
+fi
+
+if [ x"$dir_arg" != x ]; then
+	# Make a directory...
+	$doit $instcmd $dst || exit 1
+
+	# Allow chown/chgrp to fail, but log a warning
+	if [ x"$chowncmd" != x ]; then $doit $chowncmd $dst || echo "warning: Unable to change owner of $dst!"; fi
+	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dst || echo "warning: Unable to change group of $dst!"; fi
+	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dst || exit 1; fi
+else
+	# Install a file...
+	dstfile="`basename $dst`"
+
+	# Check the destination file - for libraries just use the "-x" option
+	# to strip...
+	case "$dstfile" in
+		*.a | *.dylib | *.sl | *.sl.* | *.so | *.so.*)
+			stripopt="-x"
+			;;
+		*)
+			stripopt=""
+			;;
+	esac
+
+	# Make a temp file name in the proper directory.
+	dsttmp="$dstdir/#inst.$$#"
+
+	# Move or copy the file name to the temp name
+	$doit $instcmd $src $dsttmp || exit 1
+
+	# Update permissions and strip as needed, then move to the final name.
+	# If the chmod, strip, rm, or mv commands fail, remove the installed
+	# file...
+	if [ x"$stripcmd" != x ]; then $doit $stripcmd $stripopt "$dsttmp" || echo "warning: Unable to strip $dst!"; fi
+	if [ x"$chowncmd" != x ]; then $doit $chowncmd "$dsttmp" || echo "warning: Unable to change owner of $dst!"; fi
+	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd "$dsttmp" || echo "warning: Unable to change group of $dst!"; fi
+
+	trap "rm -f ${dsttmp}" 0 &&
+	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd "$dsttmp"; fi &&
+	$doit $rmcmd -f "$dstdir/$dstfile" &&
+	$doit $mvcmd "$dsttmp" "$dstdir/$dstfile"
+fi
+
+exit 0

makesrcdist

@@ -2,18 +2,90 @@
 #
 # makesrcdist - make a source distribution of pdfio.
 #
+# Usage:
+#
+#   ./makesrcdist [--snapshot] VERSION
+#
 
-if test $# != 1; then
-	echo "Usage: ./makesrcdist version"
-	exit 1
+# Support "--snapshot" option...
+if test "$1" == "--snapshot"; then
+    shift
+    snapshot=1
+else
+    snapshot=0
 fi
 
+# Get version...
+if test $# != 1; then
+    echo "Usage: ./makesrcdist [--snapshot] VERSION"
+    exit 1
+fi
+
+status=0
 version=$1
+version_major=$(echo $1 | awk -F. '{print $1}')
+version_minor=$(echo $1 | awk -F. '{print $2}')
 
-echo Creating tag for release...
-git tag -m "Tag $version" v$version
-git push origin v$version
+# Check that version number has been updated everywhere...
+if test $(grep AC_INIT configure.ac | awk '{print $2}') != "[$version],"; then
+    echo "Still need to update AC_INIT version in 'configure.ac'."
+    status=1
+fi
 
+if test $(head -4 CHANGES.md | tail -1 | awk '{print $1}') != "v$version"; then
+    echo "Still need to update CHANGES.md version number."
+    status=1
+fi
+if test $(head -4 CHANGES.md | tail -1 | awk '{print $3}') = "YYYY-MM-DD"; then
+    echo "Still need to update CHANGES.md release date."
+    status=1
+fi
+
+if test $(grep PDFIO_VERSION= configure | awk -F \" '{print $2}') != "$version"; then
+    echo "Still need to run 'autoconf -f'."
+    status=1
+fi
+
+if test $(grep '<version>' pdfio_native.nuspec | sed -E -e '1,$s/^.*<version>([0-9.]+).*$/\1/') != "$version"; then
+    echo "Still need to update version in 'pdfio_native.nuspec'."
+    status=1
+fi
+
+if test $(grep '<version>' pdfio_native.redist.nuspec | sed -E -e '1,$s/^.*<version>([0-9.]+).*$/\1/') != "$version"; then
+    echo "Still need to update version in 'pdfio_native.redist.nuspec'."
+    status=1
+fi
+
+if test $(grep PDFIO_VERSION pdfio.h | awk -F \" '{print $2}') != "$version"; then
+    echo "Still need to update PDFIO_VERSION in 'pdfio.h'."
+    status=1
+fi
+if test $(grep PDFIO_VERSION_MAJOR pdfio.h | awk '{print $4}') != "$version_major"; then
+    echo "Still need to update PDFIO_VERSION_MAJOR in 'pdfio.h'."
+    status=1
+fi
+if test $(grep PDFIO_VERSION_MINOR pdfio.h | awk '{print $4}') != "$version_minor"; then
+    echo "Still need to update PDFIO_VERSION_MINOR in 'pdfio.h'."
+    status=1
+fi
+
+if test $(grep VERSION pdfio1.def | awk '{print $2}') != "$version_major.$version_minor"; then
+    echo "Still need to update VERSION in 'pdfio1.def'."
+    status=1
+fi
+
+if test $status = 1; then
+    exit 1
+fi
+
+# Tag release...
+if test $snapshot = 0; then
+    echo Creating tag for release...
+    git tag -m "Tag $version" v$version
+    git push origin v$version
+fi
+
+# Make source archives...
 echo Creating pdfio-$version.tar.gz...
 git archive --format tar --prefix=pdfio-$version/ HEAD | gzip -v9 >pdfio-$version.tar.gz
 gpg --detach-sign pdfio-$version.tar.gz

packages.config

@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
+  <package id="libpng_native" version="1.6.30" targetFramework="native" />
+  <package id="libpng_native.redist" version="1.6.30" targetFramework="native" />
   <package id="zlib_native" version="1.2.11" targetFramework="native" />
   <package id="zlib_native.redist" version="1.2.11" targetFramework="native" />
 </packages>

pdfio-aes.c

@@ -1,7 +1,7 @@
 //
 // AES functions for PDFio.
 //
-// Copyright © 2021 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -10,10 +10,6 @@
 // (<https://github.com/kokke/tiny-AES-c>)
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 
 
@@ -21,7 +17,7 @@
 // Local types...
 //
 
-typedef uint8_t state_t[4][4];		// 4x4 AES state table
+typedef uint8_t state_t[4][4];		// 4x4 AES state table @private@
 
 
 //
@@ -80,18 +76,18 @@ static const uint8_t Rcon[11] =		// Round constants
 // Local functions...
 //
 
-static void	AddRoundKey(size_t round, state_t *state, const uint8_t *RoundKey);
-static void	SubBytes(state_t *state);
-static void	ShiftRows(state_t *state);
+static void	add_round_key(size_t round, state_t *state, const uint8_t *round_key);
+static void	sub_bytes(state_t *state);
+static void	shift_rows(state_t *state);
 static uint8_t	xtime(uint8_t x);
-static void	MixColumns(state_t *state);
-static uint8_t	Multiply(uint8_t x, uint8_t y);
-static void	InvMixColumns(state_t *state);
-static void	InvSubBytes(state_t *state);
-static void	InvShiftRows(state_t *state);
-static void	Cipher(state_t *state, const _pdfio_aes_t *ctx);
-static void	InvCipher(state_t *state, const _pdfio_aes_t *ctx);
-static void	XorWithIv(uint8_t *buf, const uint8_t *Iv);
+static void	mix_columns(state_t *state);
+static uint8_t	multiply(uint8_t x, uint8_t y);
+static void	inv_mix_columns(state_t *state);
+static void	inv_sub_bytes(state_t *state);
+static void	inv_shift_rows(state_t *state);
+static void	cipher(state_t *state, const _pdfio_aes_t *ctx);
+static void	inv_cipher(state_t *state, const _pdfio_aes_t *ctx);
+static void	xor_with_iv(uint8_t *buf, const uint8_t *Iv);
 
 
 //
@@ -110,7 +106,6 @@ _pdfioCryptoAESInit(
 		*rkptr,			// Current round_key values
 		*rkend,			// End of round_key values
 		tempa[4];		// Used for the column/row operations
-//  size_t	roundlen = keylen + 24;	// Length of round_key
   size_t	nwords = keylen / 4;	// Number of 32-bit words in key
 
 
@@ -192,8 +187,8 @@ _pdfioCryptoAESDecrypt(
   while (len > 15)
   {
     memcpy(next_iv, outbuffer, 16);
-    InvCipher((state_t *)outbuffer, ctx);
-    XorWithIv(outbuffer, ctx->iv);
+    inv_cipher((state_t *)outbuffer, ctx);
+    xor_with_iv(outbuffer, ctx->iv);
     memcpy(ctx->iv, next_iv, 16);
     outbuffer += 16;
     len -= 16;
@@ -235,8 +230,8 @@ _pdfioCryptoAESEncrypt(
 
   while (len > 15)
   {
-    XorWithIv(outbuffer, iv);
-    Cipher((state_t*)outbuffer, ctx);
+    xor_with_iv(outbuffer, iv);
+    cipher((state_t*)outbuffer, ctx);
     iv = outbuffer;
     outbuffer += 16;
     len -= 16;
@@ -246,10 +241,10 @@ _pdfioCryptoAESEncrypt(
   if (len > 0)
   {
     // Pad the final buffer with (16 - len)...
-    memset(outbuffer + len, 16 - len, 16 - len);
+    memset(outbuffer + len, (int)(16 - len), 16 - len);
 
-    XorWithIv(outbuffer, iv);
-    Cipher((state_t*)outbuffer, ctx);
+    xor_with_iv(outbuffer, iv);
+    cipher((state_t*)outbuffer, ctx);
     iv = outbuffer;
     outbytes += 16;
   }
@@ -261,24 +256,32 @@ _pdfioCryptoAESEncrypt(
 }
 
 
-// This function adds the round key to state.
+//
+// 'add_round_key()' - Add the round key to state.
+//
 // The round key is added to the state by an XOR function.
+//
+
 static void
-AddRoundKey(size_t round, state_t *state, const uint8_t *RoundKey)
+add_round_key(size_t        round,	// I - Which round
+              state_t       *state,	// I - Current state
+              const uint8_t *round_key)	// I - Key
 {
   unsigned	i;			// Looping var
   uint8_t	*sptr = (*state)[0];	// Pointer into state
 
 
-  for (RoundKey += round * 16, i = 16; i > 0; i --, sptr ++, RoundKey ++)
-    *sptr ^= *RoundKey;
+  for (round_key += round * 16, i = 16; i > 0; i --, sptr ++, round_key ++)
+    *sptr ^= *round_key;
 }
 
 
-// The SubBytes Function Substitutes the values in the
-// state matrix with values in an S-box.
+//
+// 'sub_bytes()' - Substitute the values in the state matrix with values in an S-box.
+//
+
 static void
-SubBytes(state_t *state)
+sub_bytes(state_t *state)		// I - Current state
 {
   unsigned	i;			// Looping var
   uint8_t	*sptr = (*state)[0];	// Pointer into state
@@ -288,11 +291,16 @@ SubBytes(state_t *state)
     *sptr = sbox[*sptr];
 }
 
-// The ShiftRows() function shifts the rows in the state to the left.
+
+//
+// 'shift_rows()' - Shift the rows in the state to the left.
+//
 // Each row is shifted with different offset.
 // Offset = Row number. So the first row is not shifted.
+//
+
 static void
-ShiftRows(state_t *state)
+shift_rows(state_t *state)		// I - Current state
 {
   uint8_t	*sptr = (*state)[0];	// Pointer into state
   uint8_t	temp;			// Temporary value
@@ -323,21 +331,29 @@ ShiftRows(state_t *state)
 }
 
 
-static uint8_t
-xtime(uint8_t x)
+//
+// 'xtime()' - Compute the AES xtime function.
+//
+
+static uint8_t				// O - xtime(x)
+xtime(uint8_t x)			// I - Column value
 {
   return ((uint8_t)((x << 1) ^ ((x >> 7) * 0x1b)));
 }
 
 
-// MixColumns function mixes the columns of the state matrix
+//
+// 'mix_columns()' - Mix the columns of the state matrix.
+//
+
 static void
-MixColumns(state_t *state)
+mix_columns(state_t *state)		// I - Current state
 {
   unsigned	i;			// Looping var
   uint8_t	*sptr = (*state)[0];	// Pointer into state
   uint8_t	Tmp, Tm, t;		// Temporary values
 
+
   for (i = 4; i > 0; i --, sptr += 4)
   {
     t       = sptr[0];
@@ -361,11 +377,15 @@ MixColumns(state_t *state)
 }
 
 
-// Multiply is used to multiply numbers in the field GF(2^8)
+//
+// 'multiply()' - Multiply numbers in the field GF(2^8)
+//
 // Note: The last call to xtime() is unneeded, but often ends up generating a smaller binary
 //       The compiler seems to be able to vectorize the operation better this way.
 //       See https://github.com/kokke/tiny-AES-c/pull/34
-static uint8_t Multiply(uint8_t x, uint8_t y)
+//
+
+static uint8_t multiply(uint8_t x, uint8_t y)
 {
   return (((y & 1) * x) ^
 	  ((y>>1 & 1) * xtime(x)) ^
@@ -375,11 +395,15 @@ static uint8_t Multiply(uint8_t x, uint8_t y)
 }
 
 
-// MixColumns function mixes the columns of the state matrix.
+//
+// 'mix_columns()' - Mix the columns of the state matrix.
+//
 // The method used to multiply may be difficult to understand for the inexperienced.
 // Please use the references to gain more information.
+//
+
 static void
-InvMixColumns(state_t *state)
+inv_mix_columns(state_t *state)		// I - Current state
 {
   unsigned	i;			// Looping var
   uint8_t	*sptr = (*state)[0];	// Pointer into state
@@ -393,18 +417,20 @@ InvMixColumns(state_t *state)
     c = sptr[2];
     d = sptr[3];
 
-    *sptr++ = Multiply(a, 0x0e) ^ Multiply(b, 0x0b) ^ Multiply(c, 0x0d) ^ Multiply(d, 0x09);
-    *sptr++ = Multiply(a, 0x09) ^ Multiply(b, 0x0e) ^ Multiply(c, 0x0b) ^ Multiply(d, 0x0d);
-    *sptr++ = Multiply(a, 0x0d) ^ Multiply(b, 0x09) ^ Multiply(c, 0x0e) ^ Multiply(d, 0x0b);
-    *sptr++ = Multiply(a, 0x0b) ^ Multiply(b, 0x0d) ^ Multiply(c, 0x09) ^ Multiply(d, 0x0e);
+    *sptr++ = multiply(a, 0x0e) ^ multiply(b, 0x0b) ^ multiply(c, 0x0d) ^ multiply(d, 0x09);
+    *sptr++ = multiply(a, 0x09) ^ multiply(b, 0x0e) ^ multiply(c, 0x0b) ^ multiply(d, 0x0d);
+    *sptr++ = multiply(a, 0x0d) ^ multiply(b, 0x09) ^ multiply(c, 0x0e) ^ multiply(d, 0x0b);
+    *sptr++ = multiply(a, 0x0b) ^ multiply(b, 0x0d) ^ multiply(c, 0x09) ^ multiply(d, 0x0e);
   }
 }
 
 
-// The SubBytes Function Substitutes the values in the
-// state matrix with values in an S-box.
+//
+// 'sub_bytes()' - Substitute the values in the state matrix with values in an S-box.
+//
+
 static void
-InvSubBytes(state_t *state)
+inv_sub_bytes(state_t *state)		// I - Current state
 {
   unsigned	i;			// Looping var
   uint8_t	*sptr = (*state)[0];	// Pointer into state
@@ -415,8 +441,12 @@ InvSubBytes(state_t *state)
 }
 
 
+//
+// 'inv_shift_rows()' - Shift the rows in the state to the right.
+//
+
 static void
-InvShiftRows(state_t *state)
+inv_shift_rows(state_t *state)		// I - Current state
 {
   uint8_t	*sptr = (*state)[0];	// Pointer into state
   uint8_t	temp;			// Temporary value
@@ -447,40 +477,52 @@ InvShiftRows(state_t *state)
 }
 
 
-// Cipher is the main function that encrypts the PlainText.
+//
+// 'cipher()' - Encrypt the PlainText.
+//
+
 static void
-Cipher(state_t *state, const _pdfio_aes_t *ctx)
+cipher(state_t            *state,	// I - Current state
+       const _pdfio_aes_t *ctx)		// I - AES context
 {
-  size_t round = 0;
+  size_t round = 0;			// Current round
+
 
   // Add the First round key to the state before starting the rounds.
-  AddRoundKey(0, state, ctx->round_key);
+  add_round_key(0, state, ctx->round_key);
 
   // There will be Nr rounds.
   // The first Nr-1 rounds are identical.
   // These Nr rounds are executed in the loop below.
-  // Last one without MixColumns()
+  // Last one without mix_columns()
   for (round = 1; round < ctx->round_size; round ++)
   {
-    SubBytes(state);
-    ShiftRows(state);
-    MixColumns(state);
-    AddRoundKey(round, state, ctx->round_key);
+    sub_bytes(state);
+    shift_rows(state);
+    mix_columns(state);
+    add_round_key(round, state, ctx->round_key);
   }
+
   // Add round key to last round
-  SubBytes(state);
-  ShiftRows(state);
-  AddRoundKey(ctx->round_size, state, ctx->round_key);
+  sub_bytes(state);
+  shift_rows(state);
+  add_round_key(ctx->round_size, state, ctx->round_key);
 }
 
 
+//
+// 'inv_cipher()' - Decrypt the CipherText.
+//
+
 static void
-InvCipher(state_t *state, const _pdfio_aes_t *ctx)
+inv_cipher(state_t            *state,	// I - Current state
+           const _pdfio_aes_t *ctx)	// I - AES context
 {
-  size_t round;
+  size_t round;				// Current round
+
 
   // Add the First round key to the state before starting the rounds.
-  AddRoundKey(ctx->round_size, state, ctx->round_key);
+  add_round_key(ctx->round_size, state, ctx->round_key);
 
   // There will be Nr rounds.
   // The first Nr-1 rounds are identical.
@@ -488,20 +530,25 @@ InvCipher(state_t *state, const _pdfio_aes_t *ctx)
   // Last one without InvMixColumn()
   for (round = ctx->round_size - 1; ; round --)
   {
-    InvShiftRows(state);
-    InvSubBytes(state);
-    AddRoundKey(round, state, ctx->round_key);
+    inv_shift_rows(state);
+    inv_sub_bytes(state);
+    add_round_key(round, state, ctx->round_key);
 
     if (round == 0)
       break;
 
-    InvMixColumns(state);
+    inv_mix_columns(state);
   }
 }
 
 
+//
+// 'xor_with_iv()' - XOR a block with the initialization vector.
+//
+
 static void
-XorWithIv(uint8_t *buf, const uint8_t *Iv)
+xor_with_iv(uint8_t       *buf,		// I - Block
+            const uint8_t *Iv)		// I - Initialization vector
 {
   // 16-byte block...
   *buf++ ^= *Iv++;

pdfio-array.c

@@ -1,16 +1,12 @@
 //
 // PDF array functions for PDFio.
 //
-// Copyright © 2021 by Michael R Sweet.
+// Copyright © 2021-2024 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 
 
@@ -331,6 +327,30 @@ pdfioArrayCreate(pdfio_file_t *pdf)	// I - PDF file
 }
 
 
+//
+// '_pdfioArrayDecrypt()' - Decrypt values in an array.
+//
+
+bool					// O - `true` on success, `false` on error
+_pdfioArrayDecrypt(pdfio_file_t  *pdf,	// I - PDF file
+                   pdfio_obj_t   *obj,	// I - Object
+                   pdfio_array_t *a,	// I - Array
+                   size_t        depth)	// I - Depth
+{
+  size_t		i;		// Looping var
+  _pdfio_value_t	*v;		// Current value
+
+
+  for (i = a->num_values, v = a->values; i > 0; i --, v ++)
+  {
+    if (!_pdfioValueDecrypt(pdf, obj, v, depth))
+      return (false);
+  }
+
+  return (true);
+}
+
+
 //
 // '_pdfioArrayDebug()' - Print the contents of an array.
 //
@@ -343,6 +363,9 @@ _pdfioArrayDebug(pdfio_array_t *a,	// I - Array
   _pdfio_value_t	*v;		// Current value
 
 
+  if (!a)
+    return;
+
   putc('[', fp);
   for (i = a->num_values, v = a->values; i > 0; i --, v ++)
     _pdfioValueDebug(v, fp);
@@ -614,6 +637,28 @@ _pdfioArrayRead(pdfio_file_t   *pdf,	// I - PDF file
 }
 
 
+//
+// 'pdfioArrayRemove()' - Remove an array entry.
+//
+
+bool					// O - `true` on success, `false` otherwise
+pdfioArrayRemove(pdfio_array_t *a,	// I - Array
+                 size_t        n)	// I - Index
+{
+  if (!a || n >= a->num_values)
+    return (false);
+
+  if (a->values[n].type == PDFIO_VALTYPE_BINARY)
+    free(a->values[n].value.binary.data);
+
+  a->num_values --;
+  if (n < a->num_values)
+    memmove(a->values + n, a->values + n + 1, (a->num_values - n) * sizeof(_pdfio_value_t));
+
+  return (true);
+}
+
+
 //
 // '_pdfioArrayWrite()' - Write an array to a PDF file.
 //

pdfio-base-font-widths.h

@@ -0,0 +1,308 @@
+//
+// PDF base font widths for PDFio.
+//
+// Copyright © 2024 by Michael R Sweet.
+//
+// Licensed under Apache License v2.0.  See the file "LICENSE" for more
+// information.
+//
+
+#ifndef PDFIO_BASE_FONT_WIDTHS_H
+#  define PDFIO_BASE_FONT_WIDTHS_H 1
+
+
+static short courier_bold_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0,
+  600, 0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0, 600, 0,
+  0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0, 600, 600,
+  0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600
+};
+
+
+static short courier_boldoblique_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0,
+  600, 0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0, 600, 0,
+  0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0, 600, 600,
+  0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600
+};
+
+
+static short courier_oblique_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0,
+  600, 0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0, 600, 0,
+  0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0, 600, 600,
+  0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600
+};
+
+
+static short courier_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0,
+  600, 0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0, 600, 0,
+  0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 0, 600, 600,
+  0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600,
+  600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600
+};
+
+
+static short helvetica_bold_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  278, 333, 474, 556, 556, 889, 722, 238, 333, 333, 389, 584, 278, 333, 278, 278,
+  556, 556, 556, 556, 556, 556, 556, 556, 556, 556, 333, 333, 584, 584, 584, 611,
+  975, 722, 722, 722, 722, 667, 611, 778, 722, 278, 556, 722, 611, 833, 722, 778,
+  667, 778, 722, 667, 611, 722, 667, 944, 667, 667, 611, 333, 278, 333, 584, 556,
+  333, 556, 611, 556, 611, 556, 333, 611, 611, 278, 278, 556, 278, 889, 611, 611,
+  611, 611, 389, 556, 333, 611, 556, 778, 556, 556, 500, 389, 280, 389, 584, 0,
+  556, 0, 278, 556, 500, 1000, 556, 556, 333, 1000, 667, 333, 1000, 0, 611, 0,
+  0, 278, 278, 500, 500, 350, 556, 1000, 333, 1000, 556, 333, 944, 0, 500, 667,
+  0, 333, 556, 556, 556, 556, 280, 556, 333, 737, 370, 556, 584, 584, 737, 333,
+  606, 584, 351, 351, 333, 611, 556, 278, 333, 351, 365, 556, 869, 869, 869, 611,
+  722, 722, 722, 722, 722, 722, 1000, 722, 667, 667, 667, 667, 278, 278, 278, 278,
+  722, 722, 778, 778, 778, 778, 778, 584, 778, 722, 722, 722, 722, 667, 667, 611,
+  556, 556, 556, 556, 556, 556, 889, 556, 556, 556, 556, 556, 278, 278, 278, 278,
+  611, 611, 611, 611, 611, 611, 611, 584, 611, 611, 611, 611, 611, 556, 611, 556
+};
+
+
+static short helvetica_boldoblique_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  278, 333, 474, 556, 556, 889, 722, 238, 333, 333, 389, 584, 278, 333, 278, 278,
+  556, 556, 556, 556, 556, 556, 556, 556, 556, 556, 333, 333, 584, 584, 584, 611,
+  975, 722, 722, 722, 722, 667, 611, 778, 722, 278, 556, 722, 611, 833, 722, 778,
+  667, 778, 722, 667, 611, 722, 667, 944, 667, 667, 611, 333, 278, 333, 584, 556,
+  333, 556, 611, 556, 611, 556, 333, 611, 611, 278, 278, 556, 278, 889, 611, 611,
+  611, 611, 389, 556, 333, 611, 556, 778, 556, 556, 500, 389, 280, 389, 584, 0,
+  556, 0, 278, 556, 500, 1000, 556, 556, 333, 1000, 667, 333, 1000, 0, 611, 0,
+  0, 278, 278, 500, 500, 350, 556, 1000, 333, 1000, 556, 333, 944, 0, 500, 667,
+  0, 333, 556, 556, 556, 556, 280, 556, 333, 737, 370, 556, 584, 584, 737, 333,
+  606, 584, 444, 444, 333, 611, 556, 278, 333, 444, 365, 556, 1055, 1055, 1055, 611,
+  722, 722, 722, 722, 722, 722, 1000, 722, 667, 667, 667, 667, 278, 278, 278, 278,
+  722, 722, 778, 778, 778, 778, 778, 584, 778, 722, 722, 722, 722, 667, 667, 611,
+  556, 556, 556, 556, 556, 556, 889, 556, 556, 556, 556, 556, 278, 278, 278, 278,
+  611, 611, 611, 611, 611, 611, 611, 584, 611, 611, 611, 611, 611, 556, 611, 556
+};
+
+
+static short helvetica_oblique_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  278, 278, 355, 556, 556, 889, 667, 191, 333, 333, 389, 584, 278, 333, 278, 278,
+  556, 556, 556, 556, 556, 556, 556, 556, 556, 556, 278, 278, 584, 584, 584, 556,
+  1015, 667, 667, 722, 722, 667, 611, 778, 722, 278, 500, 667, 556, 833, 722, 778,
+  667, 778, 722, 667, 611, 722, 667, 944, 667, 667, 611, 278, 278, 278, 469, 556,
+  333, 556, 556, 500, 556, 556, 278, 556, 556, 222, 222, 500, 222, 833, 556, 556,
+  556, 556, 333, 500, 278, 556, 500, 722, 500, 500, 500, 334, 260, 334, 584, 0,
+  556, 0, 222, 556, 333, 1000, 556, 556, 333, 1000, 667, 333, 1000, 0, 611, 0,
+  0, 222, 222, 333, 333, 350, 556, 1000, 333, 1000, 500, 333, 944, 0, 500, 667,
+  0, 333, 556, 556, 556, 556, 260, 556, 333, 737, 370, 556, 584, 584, 737, 333,
+  606, 584, 390, 390, 333, 556, 537, 278, 333, 390, 365, 556, 947, 947, 947, 611,
+  667, 667, 667, 667, 667, 667, 1000, 722, 667, 667, 667, 667, 278, 278, 278, 278,
+  722, 722, 778, 778, 778, 778, 778, 584, 778, 722, 722, 722, 722, 667, 667, 611,
+  556, 556, 556, 556, 556, 556, 889, 500, 556, 556, 556, 556, 278, 278, 278, 278,
+  556, 556, 556, 556, 556, 556, 556, 584, 611, 556, 556, 556, 556, 500, 556, 500
+};
+
+
+static short helvetica_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  278, 278, 355, 556, 556, 889, 667, 191, 333, 333, 389, 584, 278, 333, 278, 278,
+  556, 556, 556, 556, 556, 556, 556, 556, 556, 556, 278, 278, 584, 584, 584, 556,
+  1015, 667, 667, 722, 722, 667, 611, 778, 722, 278, 500, 667, 556, 833, 722, 778,
+  667, 778, 722, 667, 611, 722, 667, 944, 667, 667, 611, 278, 278, 278, 469, 556,
+  333, 556, 556, 500, 556, 556, 278, 556, 556, 222, 222, 500, 222, 833, 556, 556,
+  556, 556, 333, 500, 278, 556, 500, 722, 500, 500, 500, 334, 260, 334, 584, 0,
+  556, 0, 222, 556, 333, 1000, 556, 556, 333, 1000, 667, 333, 1000, 0, 611, 0,
+  0, 222, 221, 333, 333, 350, 556, 1000, 333, 1000, 500, 333, 944, 0, 500, 667,
+  0, 333, 556, 556, 556, 556, 260, 556, 333, 737, 370, 556, 584, 584, 737, 333,
+  606, 584, 351, 351, 333, 556, 537, 278, 333, 351, 365, 556, 869, 869, 869, 611,
+  667, 667, 667, 667, 667, 667, 1000, 722, 667, 667, 667, 667, 278, 278, 278, 278,
+  722, 722, 778, 778, 778, 778, 778, 584, 778, 722, 722, 722, 722, 666, 666, 611,
+  556, 556, 556, 556, 556, 556, 889, 500, 556, 556, 556, 556, 278, 278, 278, 278,
+  556, 556, 556, 556, 556, 556, 556, 584, 611, 556, 556, 556, 556, 500, 555, 500
+};
+
+
+static short symbol_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  250, 333, 713, 500, 549, 833, 778, 439, 333, 333, 500, 549, 250, 549, 250, 278,
+  500, 500, 500, 500, 500, 500, 500, 500, 500, 500, 278, 278, 549, 549, 549, 444,
+  549, 722, 667, 722, 612, 611, 763, 603, 722, 333, 631, 722, 686, 889, 722, 722,
+  768, 741, 556, 592, 611, 690, 439, 768, 645, 795, 611, 333, 863, 333, 658, 500,
+  500, 631, 549, 549, 494, 439, 521, 411, 603, 329, 603, 549, 549, 576, 521, 549,
+  549, 521, 549, 603, 439, 576, 713, 686, 493, 686, 494, 480, 200, 480, 549, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  762, 620, 247, 549, 167, 713, 500, 753, 753, 753, 753, 1042, 987, 603, 987, 603,
+  400, 549, 411, 549, 549, 713, 494, 460, 549, 549, 549, 549, 1000, 603, 1000, 658,
+  823, 686, 795, 987, 768, 768, 823, 768, 768, 713, 713, 713, 713, 713, 713, 713,
+  768, 713, 790, 790, 890, 823, 549, 250, 713, 603, 603, 1042, 987, 603, 987, 603,
+  494, 329, 790, 790, 786, 713, 384, 384, 384, 384, 384, 384, 494, 494, 494, 494,
+  0, 329, 274, 686, 686, 686, 384, 384, 384, 384, 384, 384, 494, 494, 494, 0
+};
+
+
+static short times_bold_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  250, 333, 555, 500, 500, 1000, 833, 278, 333, 333, 500, 570, 250, 333, 250, 278,
+  500, 500, 500, 500, 500, 500, 500, 500, 500, 500, 333, 333, 570, 570, 570, 500,
+  930, 722, 667, 722, 722, 667, 611, 778, 778, 389, 500, 778, 667, 944, 722, 778,
+  611, 778, 722, 556, 667, 722, 722, 1000, 722, 722, 667, 333, 278, 333, 581, 500,
+  333, 500, 556, 444, 556, 444, 333, 500, 556, 278, 333, 556, 278, 833, 556, 500,
+  556, 556, 444, 389, 333, 556, 500, 722, 500, 500, 444, 394, 220, 394, 520, 0,
+  500, 0, 333, 500, 500, 1000, 500, 500, 333, 1000, 556, 333, 1000, 0, 667, 0,
+  0, 333, 333, 500, 500, 350, 500, 1000, 333, 1000, 389, 333, 722, 0, 444, 722,
+  0, 333, 500, 500, 500, 500, 220, 500, 333, 747, 300, 500, 570, 570, 747, 333,
+  400, 570, 300, 300, 333, 556, 540, 250, 333, 300, 330, 500, 750, 750, 750, 500,
+  722, 722, 722, 722, 722, 722, 1000, 722, 667, 667, 667, 667, 389, 389, 389, 389,
+  722, 722, 778, 778, 778, 778, 778, 570, 778, 722, 722, 722, 722, 722, 611, 556,
+  500, 500, 500, 500, 500, 500, 722, 444, 444, 444, 444, 444, 278, 278, 278, 278,
+  500, 556, 500, 500, 500, 500, 500, 570, 500, 556, 556, 556, 556, 500, 556, 500
+};
+
+
+static short times_bolditalic_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  250, 389, 555, 500, 500, 833, 778, 278, 333, 333, 500, 570, 250, 333, 250, 278,
+  500, 500, 500, 500, 500, 500, 500, 500, 500, 500, 333, 333, 570, 570, 570, 500,
+  832, 667, 667, 667, 722, 667, 667, 722, 778, 389, 500, 667, 611, 889, 722, 722,
+  611, 722, 667, 556, 611, 722, 667, 889, 667, 611, 611, 333, 278, 333, 570, 500,
+  333, 500, 500, 444, 500, 444, 333, 500, 556, 278, 278, 500, 278, 778, 556, 500,
+  500, 500, 389, 389, 278, 556, 444, 667, 500, 444, 389, 348, 220, 348, 570, 0,
+  500, 0, 333, 500, 500, 1000, 500, 500, 333, 1000, 556, 333, 944, 0, 611, 0,
+  0, 333, 333, 500, 500, 350, 500, 1000, 333, 1000, 389, 333, 722, 0, 389, 611,
+  0, 389, 500, 500, 500, 500, 220, 500, 333, 747, 266, 500, 606, 606, 747, 333,
+  400, 570, 300, 300, 333, 576, 500, 250, 333, 300, 300, 500, 750, 750, 750, 500,
+  667, 667, 667, 667, 667, 667, 944, 667, 667, 667, 667, 667, 389, 389, 389, 389,
+  722, 722, 722, 722, 722, 722, 722, 570, 722, 722, 722, 722, 722, 611, 611, 500,
+  500, 500, 500, 500, 500, 500, 722, 444, 444, 444, 444, 444, 278, 278, 278, 278,
+  500, 556, 500, 500, 500, 500, 500, 570, 500, 556, 556, 556, 556, 444, 500, 444
+};
+
+
+static short times_italic_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  250, 333, 420, 500, 500, 833, 778, 214, 333, 333, 500, 675, 250, 333, 250, 278,
+  500, 500, 500, 500, 500, 500, 500, 500, 500, 500, 333, 333, 675, 675, 675, 500,
+  920, 611, 611, 667, 722, 611, 611, 722, 722, 333, 444, 667, 556, 833, 667, 722,
+  611, 722, 611, 500, 556, 722, 611, 833, 611, 556, 556, 389, 278, 389, 422, 500,
+  333, 500, 500, 444, 500, 444, 278, 500, 500, 278, 278, 444, 278, 722, 500, 500,
+  500, 500, 389, 389, 278, 500, 444, 667, 444, 444, 389, 400, 275, 400, 541, 0,
+  500, 0, 333, 500, 556, 889, 500, 500, 333, 1000, 500, 333, 944, 0, 556, 0,
+  0, 333, 333, 556, 556, 350, 500, 889, 333, 980, 389, 333, 667, 0, 389, 556,
+  0, 389, 500, 500, 500, 500, 275, 500, 333, 760, 276, 500, 675, 675, 760, 333,
+  400, 675, 300, 300, 333, 500, 523, 250, 333, 300, 310, 500, 750, 750, 750, 500,
+  611, 611, 611, 611, 611, 611, 889, 667, 611, 611, 611, 611, 333, 333, 333, 333,
+  722, 667, 722, 722, 722, 722, 722, 675, 722, 722, 722, 722, 722, 556, 611, 500,
+  500, 500, 500, 500, 500, 500, 667, 444, 444, 444, 444, 444, 278, 278, 278, 278,
+  500, 500, 500, 500, 500, 500, 500, 675, 500, 500, 500, 500, 500, 444, 500, 444
+};
+
+
+static short times_roman_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  250, 333, 408, 500, 500, 833, 778, 180, 333, 333, 500, 564, 250, 333, 250, 278,
+  500, 500, 500, 500, 500, 500, 500, 500, 500, 500, 278, 278, 564, 564, 564, 444,
+  921, 722, 667, 667, 722, 611, 556, 722, 722, 333, 389, 722, 611, 889, 722, 722,
+  556, 722, 667, 556, 611, 722, 722, 944, 722, 722, 611, 333, 278, 333, 469, 500,
+  333, 444, 500, 444, 500, 444, 333, 500, 500, 278, 278, 500, 278, 778, 500, 500,
+  500, 500, 333, 389, 278, 500, 500, 722, 500, 500, 444, 480, 200, 480, 541, 0,
+  500, 0, 333, 500, 444, 1000, 500, 500, 333, 1000, 556, 333, 889, 0, 611, 0,
+  0, 333, 333, 444, 444, 350, 500, 1000, 333, 980, 389, 333, 722, 0, 444, 722,
+  0, 333, 500, 500, 500, 500, 200, 500, 333, 760, 276, 500, 564, 564, 760, 333,
+  400, 564, 300, 300, 333, 500, 453, 250, 333, 300, 310, 500, 750, 750, 750, 444,
+  722, 722, 722, 722, 722, 722, 889, 667, 611, 611, 611, 611, 333, 333, 333, 333,
+  722, 722, 722, 722, 722, 722, 722, 564, 722, 722, 722, 722, 722, 722, 556, 500,
+  444, 444, 444, 444, 444, 444, 667, 444, 444, 444, 444, 444, 278, 278, 278, 278,
+  500, 500, 500, 500, 500, 500, 500, 564, 500, 500, 500, 500, 500, 500, 500, 500
+};
+
+
+static short zapfdingbats_widths[256] =
+{
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  278, 974, 961, 974, 980, 719, 789, 790, 791, 690, 960, 939, 549, 855, 911, 933,
+  911, 945, 974, 755, 846, 762, 761, 571, 677, 763, 760, 759, 754, 494, 552, 537,
+  577, 692, 786, 788, 788, 790, 793, 794, 816, 823, 789, 841, 823, 833, 816, 831,
+  923, 744, 723, 749, 790, 792, 695, 776, 768, 792, 759, 707, 708, 682, 701, 826,
+  815, 789, 789, 707, 687, 696, 689, 786, 787, 713, 791, 785, 791, 873, 761, 762,
+  762, 759, 759, 892, 892, 788, 784, 438, 138, 277, 415, 392, 392, 668, 668, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+  0, 732, 544, 544, 910, 667, 760, 760, 776, 595, 694, 626, 788, 788, 788, 788,
+  788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788,
+  788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788, 788,
+  788, 788, 788, 788, 894, 838, 1016, 458, 748, 924, 748, 918, 927, 928, 928, 834,
+  873, 828, 924, 924, 917, 930, 931, 463, 883, 836, 836, 867, 867, 696, 696, 874,
+  0, 874, 760, 946, 771, 865, 771, 888, 967, 888, 831, 873, 927, 970, 918, 0
+};
+
+
+#endif // !PDFIO_BASE_FONT_WIDTHS_H

pdfio-common.c

@@ -1,16 +1,12 @@
 //
 // Common support functions for pdfio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 
 
@@ -102,7 +98,7 @@ _pdfioFileFlush(pdfio_file_t *pdf)	// I - PDF file
     if (!write_buffer(pdf, pdf->buffer, (size_t)(pdf->bufptr - pdf->buffer)))
       return (false);
 
-    pdf->bufpos += pdf->bufptr - pdf->buffer;
+    pdf->bufpos += (off_t)(pdf->bufptr - pdf->buffer);
   }
 
   pdf->bufptr = pdf->buffer;
@@ -145,7 +141,7 @@ _pdfioFileGets(pdfio_file_t *pdf,	// I - PDF file
 	*bufend = buffer + bufsize - 1;	// Pointer to end of buffer
 
 
-  PDFIO_DEBUG("_pdfioFileGets(pdf=%p, buffer=%p, bufsize=%lu) bufpos=%ld, buffer=%p, bufptr=%p, bufend=%p\n", pdf, buffer, (unsigned long)bufsize, (long)pdf->bufpos, pdf->buffer, pdf->bufptr, pdf->bufend);
+  PDFIO_DEBUG("_pdfioFileGets(pdf=%p, buffer=%p, bufsize=%lu) bufpos=%ld, buffer=%p, bufptr=%p, bufend=%p, offset=%lu\n", pdf, buffer, (unsigned long)bufsize, (long)pdf->bufpos, pdf->buffer, pdf->bufptr, pdf->bufend, (unsigned long)(pdf->bufpos + (pdf->bufptr - pdf->buffer)));
 
   while (!eol)
   {
@@ -220,7 +216,7 @@ _pdfioFilePeek(pdfio_file_t *pdf,	// I - PDF file
     PDFIO_DEBUG("_pdfioFilePeek: Sliding buffer, total=%ld\n", (long)total);
 
     memmove(pdf->buffer, pdf->bufptr, total);
-    pdf->bufpos += pdf->bufptr - pdf->buffer;
+    pdf->bufpos += (off_t)(pdf->bufptr - pdf->buffer);
     pdf->bufptr = pdf->buffer;
     pdf->bufend = pdf->buffer + total;
 
@@ -265,7 +261,7 @@ _pdfioFilePrintf(pdfio_file_t *pdf,	// I - PDF file
 
   // Format the string...
   va_start(ap, format);
-  vsnprintf(buffer, sizeof(buffer), format, ap);
+  _pdfio_vsnprintf(pdf, buffer, sizeof(buffer), format, ap);
   va_end(ap);
 
   // Write it...
@@ -321,14 +317,14 @@ _pdfioFileRead(pdfio_file_t *pdf,	// I - PDF file
       // Advance current position in file as needed...
       if (pdf->bufend)
       {
-	pdf->bufpos += pdf->bufend - pdf->buffer;
+	pdf->bufpos += (off_t)(pdf->bufend - pdf->buffer);
 	pdf->bufptr = pdf->bufend = NULL;
       }
 
       // Read directly from the file...
       if ((rbytes = read_buffer(pdf, bufptr, bytes)) > 0)
       {
-	pdf->bufpos += rbytes;
+	pdf->bufpos += (off_t)rbytes;
 	continue;
       }
       else if (rbytes < 0 && (errno == EINTR || errno == EAGAIN))
@@ -360,19 +356,19 @@ _pdfioFileSeek(pdfio_file_t *pdf,	// I - PDF file
                off_t        offset,	// I - Offset
                int          whence)	// I - Offset base
 {
-  PDFIO_DEBUG("_pdfioFileSeek(pdf=%p, offset=%ld, whence=%d)\n", pdf, (long)offset, whence);
+  PDFIO_DEBUG("_pdfioFileSeek(pdf=%p, offset=%ld, whence=%d) pdf->bufpos=%lu\n", pdf, (long)offset, whence, (unsigned long)(pdf ? pdf->bufpos : 0));
 
   // Adjust offset for relative seeks...
   if (whence == SEEK_CUR)
   {
-    offset += pdf->bufpos;
+    offset += pdf->bufpos + (off_t)(pdf->bufptr - pdf->buffer);
     whence = SEEK_SET;
   }
 
   if (pdf->mode == _PDFIO_MODE_READ)
   {
     // Reading, see if we already have the data we need...
-    if (whence != SEEK_END && offset >= pdf->bufpos && offset < (pdf->bufpos + pdf->bufend - pdf->buffer))
+    if (whence != SEEK_END && offset >= pdf->bufpos && pdf->bufend && offset < (off_t)(pdf->bufpos + pdf->bufend - pdf->buffer))
     {
       // Yes, seek within existing buffer...
       pdf->bufptr = pdf->buffer + (offset - pdf->bufpos);
@@ -402,13 +398,16 @@ _pdfioFileSeek(pdfio_file_t *pdf,	// I - PDF file
   }
 
   // Seek within the file...
-  if ((offset = lseek(pdf->fd, offset, whence)) < 0)
+  if ((offset = lseek(pdf->fd, offset, whence)) < 0 && whence == SEEK_END && errno == EINVAL)
+    offset = lseek(pdf->fd, 0, SEEK_SET);
+
+  if (offset < 0)
   {
     _pdfioFileError(pdf, "Unable to seek within file - %s", strerror(errno));
     return (-1);
   }
 
-  PDFIO_DEBUG("_pdfioFileSeek: Reset bufpos=%ld.\n", (long)pdf->bufpos);
+  PDFIO_DEBUG("_pdfioFileSeek: Reset bufpos=%ld, offset=%lu.\n", (long)pdf->bufpos, (unsigned long)offset);
   PDFIO_DEBUG("_pdfioFileSeek: buffer=%p, bufptr=%p, bufend=%p\n", pdf->buffer, pdf->bufptr, pdf->bufend);
 
   pdf->bufpos = offset;

pdfio-content.h

@@ -115,16 +115,21 @@ extern bool		pdfioContentSetTextXScaling(pdfio_stream_t *st, double percent) _PD
 extern bool		pdfioContentStroke(pdfio_stream_t *st) _PDFIO_PUBLIC;
 extern bool		pdfioContentTextBegin(pdfio_stream_t *st) _PDFIO_PUBLIC;
 extern bool		pdfioContentTextEnd(pdfio_stream_t *st) _PDFIO_PUBLIC;
+extern double		pdfioContentTextMeasure(pdfio_obj_t *font, const char *s, double size) _PDFIO_PUBLIC;
 extern bool		pdfioContentTextMoveLine(pdfio_stream_t *st, double tx, double ty) _PDFIO_PUBLIC;
 extern bool		pdfioContentTextMoveTo(pdfio_stream_t *st, double tx, double ty) _PDFIO_PUBLIC;
+extern bool		pdfioContentTextNewLine(pdfio_stream_t *st) _PDFIO_PUBLIC;
+extern bool		pdfioContentTextNewLineShow(pdfio_stream_t *st, double ws, double cs, bool unicode, const char *s) _PDFIO_PUBLIC;
+extern bool		pdfioContentTextNewLineShowf(pdfio_stream_t *st, double ws, double cs, bool unicode, const char *format, ...) _PDFIO_PUBLIC;
 extern bool		pdfioContentTextNextLine(pdfio_stream_t *st) _PDFIO_PUBLIC;
 extern bool		pdfioContentTextShow(pdfio_stream_t *st, bool unicode, const char *s) _PDFIO_PUBLIC;
-extern bool		pdfioContentTextShowf(pdfio_stream_t *st, bool unicode, const char *format, ...) _PDFIO_PUBLIC _PDFIO_FORMAT(3,4);
+extern bool		pdfioContentTextShowf(pdfio_stream_t *st, bool unicode, const char *format, ...) _PDFIO_PUBLIC;
 extern bool		pdfioContentTextShowJustified(pdfio_stream_t *st, bool unicode, size_t num_fragments, const double *offsets, const char * const *fragments) _PDFIO_PUBLIC;
 
 // Resource helpers...
 extern pdfio_obj_t	*pdfioFileCreateFontObjFromBase(pdfio_file_t *pdf, const char *name) _PDFIO_PUBLIC;
 extern pdfio_obj_t	*pdfioFileCreateFontObjFromFile(pdfio_file_t *pdf, const char *filename, bool unicode) _PDFIO_PUBLIC;
+extern pdfio_obj_t	*pdfioFileCreateICCObjFromData(pdfio_file_t *pdf, const unsigned char *data, size_t datalen, size_t num_colors) _PDFIO_PUBLIC;
 extern pdfio_obj_t	*pdfioFileCreateICCObjFromFile(pdfio_file_t *pdf, const char *filename, size_t num_colors) _PDFIO_PUBLIC;
 extern pdfio_obj_t	*pdfioFileCreateImageObjFromData(pdfio_file_t *pdf, const unsigned char *data, size_t width, size_t height, size_t num_colors, pdfio_array_t *color_data, bool alpha, bool interpolate) _PDFIO_PUBLIC;
 extern pdfio_obj_t	*pdfioFileCreateImageObjFromFile(pdfio_file_t *pdf, const char *filename, bool interpolate) _PDFIO_PUBLIC;

pdfio-crypto.c

@@ -1,16 +1,12 @@
 //
 // Cryptographic support functions for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 #if _WIN32
 #  include <windows.h>
@@ -403,16 +399,23 @@ _pdfioCryptoMakeRandom(uint8_t *buffer,	// I - Buffer
 //
 
 _pdfio_crypto_cb_t			// O  - Decryption callback or `NULL` for none
- _pdfioCryptoMakeReader(
+_pdfioCryptoMakeReader(
      pdfio_file_t        *pdf,		// I  - PDF file
      pdfio_obj_t         *obj,		// I  - PDF object
      _pdfio_crypto_ctx_t *ctx,		// I  - Pointer to crypto context
      uint8_t             *iv,		// I  - Buffer for initialization vector
      size_t              *ivlen)	// IO - Size of initialization vector
 {
-  uint8_t	data[21];		/* Key data */
-  _pdfio_md5_t	md5;			/* MD5 state */
-  uint8_t	digest[16];		/* MD5 digest value */
+  uint8_t	data[21];		// Key data
+  _pdfio_md5_t	md5;			// MD5 state
+  uint8_t	digest[16];		// MD5 digest value
+#if PDFIO_OBJ_CRYPT
+  pdfio_array_t	*id_array;		// Object ID array
+  unsigned char	*id_value;		// Object ID value
+  size_t	id_len;			// Length of object ID
+  uint8_t	temp_key[16];		// File key for object
+#endif // PDFIO_OBJ_CRYPT
+  uint8_t	*file_key;		// Computed file key to use
 
 
   PDFIO_DEBUG("_pdfioCryptoMakeReader(pdf=%p, obj=%p(%d), ctx=%p, iv=%p, ivlen=%p(%d))\n", pdf, obj, (int)obj->number, ctx, iv, ivlen, (int)*ivlen);
@@ -424,15 +427,70 @@ _pdfio_crypto_cb_t			// O  - Decryption callback or `NULL` for none
     return (NULL);
   }
 
+#if PDFIO_OBJ_CRYPT
+  if ((id_array = pdfioDictGetArray(pdfioObjGetDict(obj), "ID")) != NULL)
+  {
+    // Object has its own ID that will get used for encryption...
+    _pdfio_md5_t md5;			// MD5 context
+    uint8_t	file_digest[16];	// MD5 digest of file ID and pad
+    uint8_t	user_pad[32],		// Padded user password
+		own_user_key[32],	// Calculated user key
+		pdf_user_key[32];	// Decrypted user key
+
+    PDFIO_DEBUG("_pdfioCryptoMakeReader: Per-object file ID.\n");
+
+    if ((id_value = pdfioArrayGetBinary(id_array, 0, &id_len)) == NULL)
+    {
+      *ivlen = 0;
+      return (NULL);
+    }
+
+    _pdfioCryptoMD5Init(&md5);
+    _pdfioCryptoMD5Append(&md5, pdf_passpad, 32);
+    _pdfioCryptoMD5Append(&md5, id_value, id_len);
+    _pdfioCryptoMD5Finish(&md5, file_digest);
+
+    make_owner_key(pdf->encryption, pdf->password, pdf->owner_key, user_pad);
+    make_file_key(pdf->encryption, pdf->permissions, id_value, id_len, user_pad, pdf->owner_key, temp_key);
+    make_user_key(id_value, id_len, own_user_key);
+
+    if (memcmp(own_user_key, pdf->user_key, sizeof(own_user_key)))
+    {
+      PDFIO_DEBUG("_pdfioCryptoMakeReader: Not user password, trying owner password.\n");
+
+      make_file_key(pdf->encryption, pdf->permissions, id_value, id_len, pdf->password, pdf->owner_key, temp_key);
+      make_user_key(id_value, id_len, own_user_key);
+
+      memcpy(pdf_user_key, pdf->user_key, sizeof(pdf_user_key));
+      decrypt_user_key(pdf->encryption, temp_key, pdf_user_key);
+
+      if (memcmp(pdf->password, pdf_user_key, 32) && memcmp(own_user_key, pdf_user_key, 16))
+      {
+        _pdfioFileError(pdf, "Unable to unlock file.");
+	*ivlen = 0;
+	return (NULL);
+      }
+    }
+
+    file_key = temp_key;
+  }
+  else
+#endif // PDFIO_OBJ_CRYPT
+  {
+    // Use the default file key...
+    file_key = pdf->file_key;
+  }
+
   switch (pdf->encryption)
   {
     default :
+        _pdfioFileError(pdf, "Unsupported encryption algorithm.");
         *ivlen = 0;
         return (NULL);
 
     case PDFIO_ENCRYPTION_RC4_40 :
 	// Copy the key data for the MD5 hash.
-	memcpy(data, pdf->file_key, sizeof(pdf->file_key));
+	memcpy(data, file_key, 16);
 	data[16] = (uint8_t)obj->number;
 	data[17] = (uint8_t)(obj->number >> 8);
 	data[18] = (uint8_t)(obj->number >> 16);
@@ -449,10 +507,17 @@ _pdfio_crypto_cb_t			// O  - Decryption callback or `NULL` for none
 	*ivlen = 0;
 	return ((_pdfio_crypto_cb_t)_pdfioCryptoRC4Crypt);
 
-    case PDFIO_ENCRYPTION_RC4_128 :
     case PDFIO_ENCRYPTION_AES_128 :
+        if (*ivlen < 16)
+        {
+          *ivlen = 0;
+          _pdfioFileError(pdf, "Value too short for AES encryption.");
+          return (NULL);
+        }
+
+    case PDFIO_ENCRYPTION_RC4_128 :
 	// Copy the key data for the MD5 hash.
-	memcpy(data, pdf->file_key, sizeof(pdf->file_key));
+	memcpy(data, file_key, 16);
 	data[16] = (uint8_t)obj->number;
 	data[17] = (uint8_t)(obj->number >> 8);
 	data[18] = (uint8_t)(obj->number >> 16);
@@ -488,7 +553,7 @@ _pdfio_crypto_cb_t			// O  - Decryption callback or `NULL` for none
 //
 
 _pdfio_crypto_cb_t			// O  - Encryption callback or `NULL` for none
- _pdfioCryptoMakeWriter(
+_pdfioCryptoMakeWriter(
      pdfio_file_t        *pdf,		// I  - PDF file
      pdfio_obj_t         *obj,		// I  - PDF object
      _pdfio_crypto_ctx_t *ctx,		// I  - Pointer to crypto context
@@ -593,6 +658,8 @@ _pdfioCryptoUnlock(
   revision = (int)pdfioDictGetNumber(encrypt_dict, "R");
   length   = (int)pdfioDictGetNumber(encrypt_dict, "Length");
 
+  PDFIO_DEBUG("_pdfioCryptoUnlock: handler=%p(%s), version=%d, revision=%d, length=%d\n", (void *)handler, handler ? handler : "(null)", version, revision, length);
+
   if (!handler || strcmp(handler, "Standard"))
   {
     _pdfioFileError(pdf, "Unsupported security handler '%s'.", handler ? handler : "(null)");
@@ -641,6 +708,8 @@ _pdfioCryptoUnlock(
     }
     else
     {
+      PDFIO_DEBUG("_pdfioCryptoUnlock: CFM=\"%s\"\n", cfm);
+
       if (length < 40 || length > 128)
 	length = 128;			// Default to 128 bits
 
@@ -766,17 +835,16 @@ _pdfioCryptoUnlock(
       {
         // Matches!
         memcpy(pdf->file_key, file_key, sizeof(pdf->file_key));
+        memcpy(pdf->password, pad, sizeof(pdf->password));
+
         return (true);
       }
 
-     /*
-      * Not the owner password, try the user password...
-      */
-
+      // Not the owner password, try the user password...
       make_file_key(pdf->encryption, pdf->permissions, file_id, file_idlen, pad, pdf->owner_key, file_key);
       PDFIO_DEBUG("_pdfioCryptoUnlock: Fuse=%02X%02X%02X%02X...%02X%02X%02X%02X\n", file_key[0], file_key[1], file_key[2], file_key[3], file_key[12], file_key[13], file_key[14], file_key[15]);
 
-      make_user_key(file_id, file_idlen, user_key);
+      make_user_key(file_id, file_idlen, own_user_key);
 
       memcpy(pdf_user_key, pdf->user_key, sizeof(pdf_user_key));
       decrypt_user_key(pdf->encryption, file_key, pdf_user_key);
@@ -784,10 +852,12 @@ _pdfioCryptoUnlock(
       PDFIO_DEBUG("_pdfioCryptoUnlock: Uuse=%02X%02X%02X%02X...%02X%02X%02X%02X\n", user_key[0], user_key[1], user_key[2], user_key[3], user_key[28], user_key[29], user_key[30], user_key[31]);
       PDFIO_DEBUG("_pdfioCryptoUnlock: Updf=%02X%02X%02X%02X...%02X%02X%02X%02X\n", pdf_user_key[0], pdf_user_key[1], pdf_user_key[2], pdf_user_key[3], pdf_user_key[28], pdf_user_key[29], pdf_user_key[30], pdf_user_key[31]);
 
-      if (!memcmp(pad, pdf_user_key, 32) || !memcmp(user_key, pdf_user_key, 16))
+      if (!memcmp(pad, pdf_user_key, 32) || !memcmp(own_user_key, pdf_user_key, 16))
       {
         // Matches!
         memcpy(pdf->file_key, file_key, sizeof(pdf->file_key));
+        memcpy(pdf->password, pad, sizeof(pdf->password));
+
         return (true);
       }
     }

pdfio-dict.c

@@ -1,16 +1,12 @@
 //
 // PDF dictionary functions for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 
 
@@ -22,19 +18,22 @@ static int	compare_pairs(_pdfio_pair_t *a, _pdfio_pair_t *b);
 
 
 //
-// '_pdfioDictClear()' - Remove a key/value pair from a dictionary.
+// 'pdfioDictClear()' - Remove a key/value pair from a dictionary.
 //
 
-void
-_pdfioDictClear(pdfio_dict_t *dict,	// I - Dictionary
-                const char   *key)	// I - Key
+bool					// O - `true` if cleared, `false` otherwise
+pdfioDictClear(pdfio_dict_t *dict,	// I - Dictionary
+               const char   *key)	// I - Key
 {
   size_t	idx;			// Index into pairs
   _pdfio_pair_t	*pair,			// Current pair
 		pkey;			// Search key
 
 
-  PDFIO_DEBUG("_pdfioDictClear(dict=%p, key=\"%s\")\n", dict, key);
+  PDFIO_DEBUG("pdfioDictClear(dict=%p, key=\"%s\")\n", dict, key);
+
+  if (!dict || !key)
+    return (false);
 
   // See if the key is already set...
   if (dict->num_pairs > 0)
@@ -52,8 +51,12 @@ _pdfioDictClear(pdfio_dict_t *dict,	// I - Dictionary
 
       if (idx < dict->num_pairs)
         memmove(pair, pair + 1, (dict->num_pairs - idx) * sizeof(_pdfio_pair_t));
+
+      return (true);
     }
   }
+
+  return (false);
 }
 
 
@@ -162,6 +165,30 @@ pdfioDictCreate(pdfio_file_t *pdf)	// I - PDF file
 }
 
 
+//
+// '_pdfioDictDecrypt()' - Decrypt the values in a dictionary.
+//
+
+bool					// O - `true` on success, `false` on error
+_pdfioDictDecrypt(pdfio_file_t *pdf,	// I - PDF file
+                  pdfio_obj_t  *obj,	// I - Object
+                  pdfio_dict_t *dict,	// I - Dictionary
+                  size_t       depth)	// I - Depth
+{
+  size_t	i;			// Looping var
+  _pdfio_pair_t	*pair;			// Current pair
+
+
+  for (i = dict->num_pairs, pair = dict->pairs; i > 0; i --, pair ++)
+  {
+    if (strcmp(pair->key, "ID") && !_pdfioValueDecrypt(pdf, obj, &pair->value, depth + 1))
+      return (false);
+  }
+
+  return (true);
+}
+
+
 //
 // '_pdfioDictDebug()' - Dump a dictionary to stderr.
 //
@@ -174,6 +201,9 @@ _pdfioDictDebug(pdfio_dict_t *dict,	// I - Dictionary
   _pdfio_pair_t	*pair;			// Current pair
 
 
+  if (!dict)
+    return;
+
   for (i = dict->num_pairs, pair = dict->pairs; i > 0; i --, pair ++)
   {
     fprintf(fp, "/%s", pair->key);
@@ -312,6 +342,18 @@ pdfioDictGetDict(pdfio_dict_t *dict,	// I - Dictionary
 }
 
 
+//
+// 'pdfioDictGetKey()' - Get the key for the specified pair.
+//
+
+const char *				// O - Key for specified pair
+pdfioDictGetKey(pdfio_dict_t *dict,	// I - Dictionary
+                size_t       n)		// I - Pair index (`0`-based)
+{
+  return ((dict && n < dict->num_pairs) ? dict->pairs[n].key : NULL);
+}
+
+
 //
 // 'pdfioDictGetName()' - Get a key name value from a dictionary.
 //
@@ -330,6 +372,17 @@ pdfioDictGetName(pdfio_dict_t *dict,	// I - Dictionary
 }
 
 
+//
+// 'pdfioDictGetNumPairs()' - Get the number of key/value pairs in a dictionary.
+//
+
+size_t					// O - Number of pairs
+pdfioDictGetNumPairs(pdfio_dict_t *dict)// I - Dictionary
+{
+  return (dict ? dict->num_pairs : 0);
+}
+
+
 //
 // 'pdfioDictGetNumber()' - Get a key number value from a dictionary.
 //
@@ -406,9 +459,151 @@ pdfioDictGetString(pdfio_dict_t *dict,	// I - Dictionary
 
 
   if (value && value->type == PDFIO_VALTYPE_STRING)
+  {
     return (value->value.string);
+  }
+  else if (value && value->type == PDFIO_VALTYPE_BINARY && value->value.binary.datalen < 4096)
+  {
+    // Convert binary string to regular string...
+    char	temp[4096],		// Temporary string
+		*tempptr;		// Pointer into temporary string
+    unsigned char *dataptr;		// Pointer into the data string
+
+    if (!(value->value.binary.datalen & 1) && !memcmp(value->value.binary.data, "\376\377", 2))
+    {
+      // Copy UTF-16 BE
+      int	ch;			// Unicode character
+      size_t	remaining;		// Remaining bytes
+
+      for (dataptr = value->value.binary.data + 2, remaining = value->value.binary.datalen - 2, tempptr = temp; remaining > 1 && tempptr < (temp + sizeof(temp) - 5); dataptr += 2, remaining -= 2)
+      {
+        ch = (dataptr[0] << 8) | dataptr[1];
+
+        if (ch >= 0xd800 && ch <= 0xdbff && remaining > 3)
+	{
+	  // Multi-word UTF-16 char...
+          int lch;			// Lower bits
+
+	  lch = (dataptr[2] << 8) | dataptr[3];
+
+          if (lch < 0xdc00 || lch >= 0xdfff)
+	    break;
+
+          ch        = (((ch & 0x3ff) << 10) | (lch & 0x3ff)) + 0x10000;
+          dataptr   += 2;
+          remaining -= 2;
+	}
+	else if (ch >= 0xfffe)
+	{
+	  continue;
+	}
+
+        if (ch < 128)
+        {
+          // ASCII
+          *tempptr++ = (char)ch;
+        }
+        else if (ch < 4096)
+        {
+          // 2-byte UTF-8
+          *tempptr++ = (char)(0xc0 | (ch >> 6));
+          *tempptr++ = (char)(0x80 | (ch & 0x3f));
+        }
+        else if (ch < 65536)
+        {
+          // 3-byte UTF-8
+          *tempptr++ = (char)(0xe0 | (ch >> 12));
+          *tempptr++ = (char)(0x80 | ((ch >> 6) & 0x3f));
+          *tempptr++ = (char)(0x80 | (ch & 0x3f));
+        }
+        else
+        {
+          // 4-byte UTF-8
+          *tempptr++ = (char)(0xe0 | (ch >> 18));
+          *tempptr++ = (char)(0x80 | ((ch >> 12) & 0x3f));
+          *tempptr++ = (char)(0x80 | ((ch >> 6) & 0x3f));
+          *tempptr++ = (char)(0x80 | (ch & 0x3f));
+        }
+      }
+
+      *tempptr = '\0';
+    }
+    else if (!(value->value.binary.datalen & 1) && !memcmp(value->value.binary.data, "\377\376", 2))
+    {
+      // Copy UTF-16 LE
+      int	ch;			// Unicode character
+      size_t	remaining;		// Remaining bytes
+
+      for (dataptr = value->value.binary.data + 2, remaining = value->value.binary.datalen - 2, tempptr = temp; remaining > 1 && tempptr < (temp + sizeof(temp) - 5); dataptr += 2, remaining -= 2)
+      {
+        ch = (dataptr[1] << 8) | dataptr[0];
+
+        if (ch >= 0xd800 && ch <= 0xdbff && remaining > 3)
+	{
+	  // Multi-word UTF-16 char...
+          int lch;			// Lower bits
+
+	  lch = (dataptr[3] << 8) | dataptr[2];
+
+          if (lch < 0xdc00 || lch >= 0xdfff)
+	    break;
+
+          ch        = (((ch & 0x3ff) << 10) | (lch & 0x3ff)) + 0x10000;
+          dataptr   += 2;
+          remaining -= 2;
+	}
+	else if (ch >= 0xfffe)
+	{
+	  continue;
+	}
+
+        if (ch < 128)
+        {
+          // ASCII
+          *tempptr++ = (char)ch;
+        }
+        else if (ch < 4096)
+        {
+          // 2-byte UTF-8
+          *tempptr++ = (char)(0xc0 | (ch >> 6));
+          *tempptr++ = (char)(0x80 | (ch & 0x3f));
+        }
+        else if (ch < 65536)
+        {
+          // 3-byte UTF-8
+          *tempptr++ = (char)(0xe0 | (ch >> 12));
+          *tempptr++ = (char)(0x80 | ((ch >> 6) & 0x3f));
+          *tempptr++ = (char)(0x80 | (ch & 0x3f));
+        }
+        else
+        {
+          // 4-byte UTF-8
+          *tempptr++ = (char)(0xe0 | (ch >> 18));
+          *tempptr++ = (char)(0x80 | ((ch >> 12) & 0x3f));
+          *tempptr++ = (char)(0x80 | ((ch >> 6) & 0x3f));
+          *tempptr++ = (char)(0x80 | (ch & 0x3f));
+        }
+      }
+
+      *tempptr = '\0';
+    }
+    else
+    {
+      // Copy as-is...
+      memcpy(temp, value->value.binary.data, value->value.binary.datalen);
+      temp[value->value.binary.datalen] = '\0';
+    }
+
+    free(value->value.binary.data);
+    value->type         = PDFIO_VALTYPE_STRING;
+    value->value.string = pdfioStringCreate(dict->pdf, temp);
+
+    return (value->value.string);
+  }
   else
+  {
     return (NULL);
+  }
 }
 
 
@@ -522,7 +717,7 @@ _pdfioDictRead(pdfio_file_t   *pdf,	// I - PDF file
   _pdfio_value_t	value;		// Dictionary value
 
 
-  PDFIO_DEBUG("_pdfioDictRead(pdf=%p)\n", pdf);
+  PDFIO_DEBUG("_pdfioDictRead(pdf=%p, obj=%p, tb=%p, depth=%lu)\n", pdf, obj, tb, (unsigned long)depth);
 
   // Create a dictionary and start reading...
   if ((dict = pdfioDictCreate(pdf)) == NULL)
@@ -534,6 +729,7 @@ _pdfioDictRead(pdfio_file_t   *pdf,	// I - PDF file
     if (!strcmp(key, ">>"))
     {
       // End of dictionary...
+      PDFIO_DEBUG("_pdfioDictRead: Returning dictionary value...\n");
       return (dict);
     }
     else if (key[0] != '/')
@@ -552,14 +748,14 @@ _pdfioDictRead(pdfio_file_t   *pdf,	// I - PDF file
 
     if (!_pdfioValueRead(pdf, obj, tb, &value, depth))
     {
-      _pdfioFileError(pdf, "Missing value for dictionary key.");
+      _pdfioFileError(pdf, "Missing value for dictionary key '%s'.", key + 1);
       break;
     }
 
     if (!_pdfioDictSetValue(dict, pdfioStringCreate(pdf, key + 1), &value))
       break;
 
-//    PDFIO_DEBUG("_pdfioDictRead: Set %s.\n", key);
+    PDFIO_DEBUG("_pdfioDictRead: Set %s.\n", key);
   }
 
   // Dictionary is invalid - pdfioFileClose will free the memory, return NULL
@@ -972,7 +1168,7 @@ _pdfioDictWrite(pdfio_dict_t *dict,	// I - Dictionary
   // Write all of the key/value pairs...
   for (i = dict->num_pairs, pair = dict->pairs; i > 0; i --, pair ++)
   {
-    if (!_pdfioFilePrintf(pdf, "/%s", pair->key))
+    if (!_pdfioFilePrintf(pdf, "%N", pair->key))
       return (false);
 
     if (length && !strcmp(pair->key, "Length") && pair->value.type == PDFIO_VALTYPE_NUMBER && pair->value.value.number <= 0.0)

pdfio-md5.c

@@ -1,7 +1,7 @@
 //
 // MD5 functions for PDFio.
 //
-// Copyright © 2021 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 // Copyright © 1999 Aladdin Enterprises.  All rights reserved.
 //
 // This software is provided 'as-is', without any express or implied
@@ -108,231 +108,285 @@
 #define T63 0x2ad7d2bb
 #define T64 0xeb86d391
 
+
+//
+// Use the unoptimized (big-endian) implementation if we don't know the
+// endian-ness of the platform.
+//
+
+#ifdef __BYTE_ORDER__
+#  if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#    define ARCH_IS_BIG_ENDIAN	0	// Use little endian optimized version
+#  else
+#    define ARCH_IS_BIG_ENDIAN	1	// Use generic version
+#  endif // __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#elif !defined(ARCH_IS_BIG_ENDIAN)
+#  define ARCH_IS_BIG_ENDIAN	1	// Use generic version
+#endif // !ARCH_IS_BIG_ENDIAN
+
+
+//
+// 'md5_process()' - Hash a block of data.
+//
+
 static void
-md5_process(_pdfio_md5_t *pms, const uint8_t *data /*[64]*/)
+md5_process(_pdfio_md5_t  *pms,		// I - MD5 state
+            const uint8_t *data/*[64]*/)// I - Data
 {
-    uint32_t
-	a = pms->abcd[0], b = pms->abcd[1],
-	c = pms->abcd[2], d = pms->abcd[3];
-    uint32_t t;
+  uint32_t	a = pms->abcd[0],	// First word of state
+		b = pms->abcd[1],	// Second word of state
+		c = pms->abcd[2],	// Third word of state
+		d = pms->abcd[3];	// Fourth word of state
+  uint32_t	t;			// Temporary state
+
 
-#ifndef ARCH_IS_BIG_ENDIAN
-# define ARCH_IS_BIG_ENDIAN 1	/* slower, default implementation */
-#endif
 #if ARCH_IS_BIG_ENDIAN
+  // On big-endian machines, we must arrange the bytes in the right
+  // order.  (This also works on machines of unknown byte order.)
+  uint32_t	X[16];			// Little-endian representation
+  const uint8_t	*xp;			// Pointer into data
+  int		i;			// Looping var
 
-    /*
-     * On big-endian machines, we must arrange the bytes in the right
-     * order.  (This also works on machines of unknown byte order.)
-     */
-    uint32_t X[16];
-    const uint8_t *xp = data;
-    int i;
-
-    for (i = 0; i < 16; ++i, xp += 4)
-	X[i] = xp[0] + (unsigned)(xp[1] << 8) + (unsigned)(xp[2] << 16) + (unsigned)(xp[3] << 24);
+  for (i = 0, xp = data; i < 16; i ++, xp += 4)
+    X[i] = xp[0] + (unsigned)(xp[1] << 8) + (unsigned)(xp[2] << 16) + (unsigned)(xp[3] << 24);
 
 #else  /* !ARCH_IS_BIG_ENDIAN */
+  // On little-endian machines, we can process properly aligned data without copying it.
+  uint32_t	xbuf[16];		// Aligned buffer
+  const uint32_t *X;			// Pointer to little-endian representation
 
-    /*
-     * On little-endian machines, we can process properly aligned data
-     * without copying it.
-     */
-    uint32_t xbuf[16];
-    const uint32_t *X;
-
-    if (!((data - (const uint8_t *)0) & 3)) {
-	/* data are properly aligned */
-	X = (const uint32_t *)data;
-    } else {
-	/* not aligned */
-	memcpy(xbuf, data, 64);
-	X = xbuf;
-    }
-#endif
+  if (!((data - (const uint8_t *)0) & 3))
+  {
+    // data is properly aligned, use it directly...
+    X = (const uint32_t *)data;
+  }
+  else
+  {
+    // data is not aligned, copy to the aligned buffer...
+    memcpy(xbuf, data, 64);
+    X = xbuf;
+  }
+#endif // ARCH_IS_BIG_ENDIAN
 
 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
 
-    /* Round 1. */
-    /* Let [abcd k s i] denote the operation
-       a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s). */
-#define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
-#define SET(a, b, c, d, k, s, Ti)\
-  t = a + F(b,c,d) + X[k] + Ti;\
-  a = ROTATE_LEFT(t, s) + b
-    /* Do the following 16 operations. */
-    SET(a, b, c, d,  0,  7,  T1);
-    SET(d, a, b, c,  1, 12,  T2);
-    SET(c, d, a, b,  2, 17,  T3);
-    SET(b, c, d, a,  3, 22,  T4);
-    SET(a, b, c, d,  4,  7,  T5);
-    SET(d, a, b, c,  5, 12,  T6);
-    SET(c, d, a, b,  6, 17,  T7);
-    SET(b, c, d, a,  7, 22,  T8);
-    SET(a, b, c, d,  8,  7,  T9);
-    SET(d, a, b, c,  9, 12, T10);
-    SET(c, d, a, b, 10, 17, T11);
-    SET(b, c, d, a, 11, 22, T12);
-    SET(a, b, c, d, 12,  7, T13);
-    SET(d, a, b, c, 13, 12, T14);
-    SET(c, d, a, b, 14, 17, T15);
-    SET(b, c, d, a, 15, 22, T16);
+  // Round 1.
+  // Let [abcd k s i] denote the operation
+  //   a = b + ((a + F(b,c,d) + X[k] + T[i]) <<< s).
+#define F(x, y, z)		(((x) & (y)) | (~(x) & (z)))
+#define SET(a, b, c, d, k, s, Ti) t = a + F(b,c,d) + X[k] + Ti; a = ROTATE_LEFT(t, s) + b
+
+  // Do the following 16 operations.
+  SET(a, b, c, d,  0,  7,  T1);
+  SET(d, a, b, c,  1, 12,  T2);
+  SET(c, d, a, b,  2, 17,  T3);
+  SET(b, c, d, a,  3, 22,  T4);
+  SET(a, b, c, d,  4,  7,  T5);
+  SET(d, a, b, c,  5, 12,  T6);
+  SET(c, d, a, b,  6, 17,  T7);
+  SET(b, c, d, a,  7, 22,  T8);
+  SET(a, b, c, d,  8,  7,  T9);
+  SET(d, a, b, c,  9, 12, T10);
+  SET(c, d, a, b, 10, 17, T11);
+  SET(b, c, d, a, 11, 22, T12);
+  SET(a, b, c, d, 12,  7, T13);
+  SET(d, a, b, c, 13, 12, T14);
+  SET(c, d, a, b, 14, 17, T15);
+  SET(b, c, d, a, 15, 22, T16);
+
 #undef SET
 
-     /* Round 2. */
-     /* Let [abcd k s i] denote the operation
-          a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s). */
-#define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
-#define SET(a, b, c, d, k, s, Ti)\
-  t = a + G(b,c,d) + X[k] + Ti;\
-  a = ROTATE_LEFT(t, s) + b
-     /* Do the following 16 operations. */
-    SET(a, b, c, d,  1,  5, T17);
-    SET(d, a, b, c,  6,  9, T18);
-    SET(c, d, a, b, 11, 14, T19);
-    SET(b, c, d, a,  0, 20, T20);
-    SET(a, b, c, d,  5,  5, T21);
-    SET(d, a, b, c, 10,  9, T22);
-    SET(c, d, a, b, 15, 14, T23);
-    SET(b, c, d, a,  4, 20, T24);
-    SET(a, b, c, d,  9,  5, T25);
-    SET(d, a, b, c, 14,  9, T26);
-    SET(c, d, a, b,  3, 14, T27);
-    SET(b, c, d, a,  8, 20, T28);
-    SET(a, b, c, d, 13,  5, T29);
-    SET(d, a, b, c,  2,  9, T30);
-    SET(c, d, a, b,  7, 14, T31);
-    SET(b, c, d, a, 12, 20, T32);
+  // Round 2.
+  // Let [abcd k s i] denote the operation
+  //   a = b + ((a + G(b,c,d) + X[k] + T[i]) <<< s).
+#define G(x, y, z)		(((x) & (z)) | ((y) & ~(z)))
+#define SET(a, b, c, d, k, s, Ti) t = a + G(b,c,d) + X[k] + Ti; a = ROTATE_LEFT(t, s) + b
+
+  // Do the following 16 operations.
+  SET(a, b, c, d,  1,  5, T17);
+  SET(d, a, b, c,  6,  9, T18);
+  SET(c, d, a, b, 11, 14, T19);
+  SET(b, c, d, a,  0, 20, T20);
+  SET(a, b, c, d,  5,  5, T21);
+  SET(d, a, b, c, 10,  9, T22);
+  SET(c, d, a, b, 15, 14, T23);
+  SET(b, c, d, a,  4, 20, T24);
+  SET(a, b, c, d,  9,  5, T25);
+  SET(d, a, b, c, 14,  9, T26);
+  SET(c, d, a, b,  3, 14, T27);
+  SET(b, c, d, a,  8, 20, T28);
+  SET(a, b, c, d, 13,  5, T29);
+  SET(d, a, b, c,  2,  9, T30);
+  SET(c, d, a, b,  7, 14, T31);
+  SET(b, c, d, a, 12, 20, T32);
+
 #undef SET
 
-     /* Round 3. */
-     /* Let [abcd k s t] denote the operation
-          a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s). */
-#define H(x, y, z) ((x) ^ (y) ^ (z))
-#define SET(a, b, c, d, k, s, Ti)\
-  t = a + H(b,c,d) + X[k] + Ti;\
-  a = ROTATE_LEFT(t, s) + b
-     /* Do the following 16 operations. */
-    SET(a, b, c, d,  5,  4, T33);
-    SET(d, a, b, c,  8, 11, T34);
-    SET(c, d, a, b, 11, 16, T35);
-    SET(b, c, d, a, 14, 23, T36);
-    SET(a, b, c, d,  1,  4, T37);
-    SET(d, a, b, c,  4, 11, T38);
-    SET(c, d, a, b,  7, 16, T39);
-    SET(b, c, d, a, 10, 23, T40);
-    SET(a, b, c, d, 13,  4, T41);
-    SET(d, a, b, c,  0, 11, T42);
-    SET(c, d, a, b,  3, 16, T43);
-    SET(b, c, d, a,  6, 23, T44);
-    SET(a, b, c, d,  9,  4, T45);
-    SET(d, a, b, c, 12, 11, T46);
-    SET(c, d, a, b, 15, 16, T47);
-    SET(b, c, d, a,  2, 23, T48);
+  // Round 3.
+  // Let [abcd k s t] denote the operation
+  //   a = b + ((a + H(b,c,d) + X[k] + T[i]) <<< s).
+#define H(x, y, z)		((x) ^ (y) ^ (z))
+#define SET(a, b, c, d, k, s, Ti) t = a + H(b,c,d) + X[k] + Ti; a = ROTATE_LEFT(t, s) + b
+
+  // Do the following 16 operations.
+  SET(a, b, c, d,  5,  4, T33);
+  SET(d, a, b, c,  8, 11, T34);
+  SET(c, d, a, b, 11, 16, T35);
+  SET(b, c, d, a, 14, 23, T36);
+  SET(a, b, c, d,  1,  4, T37);
+  SET(d, a, b, c,  4, 11, T38);
+  SET(c, d, a, b,  7, 16, T39);
+  SET(b, c, d, a, 10, 23, T40);
+  SET(a, b, c, d, 13,  4, T41);
+  SET(d, a, b, c,  0, 11, T42);
+  SET(c, d, a, b,  3, 16, T43);
+  SET(b, c, d, a,  6, 23, T44);
+  SET(a, b, c, d,  9,  4, T45);
+  SET(d, a, b, c, 12, 11, T46);
+  SET(c, d, a, b, 15, 16, T47);
+  SET(b, c, d, a,  2, 23, T48);
+
 #undef SET
 
-     /* Round 4. */
-     /* Let [abcd k s t] denote the operation
-          a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s). */
-#define I(x, y, z) ((y) ^ ((x) | ~(z)))
-#define SET(a, b, c, d, k, s, Ti)\
-  t = a + I(b,c,d) + X[k] + Ti;\
-  a = ROTATE_LEFT(t, s) + b
-     /* Do the following 16 operations. */
-    SET(a, b, c, d,  0,  6, T49);
-    SET(d, a, b, c,  7, 10, T50);
-    SET(c, d, a, b, 14, 15, T51);
-    SET(b, c, d, a,  5, 21, T52);
-    SET(a, b, c, d, 12,  6, T53);
-    SET(d, a, b, c,  3, 10, T54);
-    SET(c, d, a, b, 10, 15, T55);
-    SET(b, c, d, a,  1, 21, T56);
-    SET(a, b, c, d,  8,  6, T57);
-    SET(d, a, b, c, 15, 10, T58);
-    SET(c, d, a, b,  6, 15, T59);
-    SET(b, c, d, a, 13, 21, T60);
-    SET(a, b, c, d,  4,  6, T61);
-    SET(d, a, b, c, 11, 10, T62);
-    SET(c, d, a, b,  2, 15, T63);
-    SET(b, c, d, a,  9, 21, T64);
+  // Round 4.
+  // Let [abcd k s t] denote the operation
+  //   a = b + ((a + I(b,c,d) + X[k] + T[i]) <<< s).
+#define I(x, y, z)		((y) ^ ((x) | ~(z)))
+#define SET(a, b, c, d, k, s, Ti) t = a + I(b,c,d) + X[k] + Ti; a = ROTATE_LEFT(t, s) + b
+
+  // Do the following 16 operations.
+  SET(a, b, c, d,  0,  6, T49);
+  SET(d, a, b, c,  7, 10, T50);
+  SET(c, d, a, b, 14, 15, T51);
+  SET(b, c, d, a,  5, 21, T52);
+  SET(a, b, c, d, 12,  6, T53);
+  SET(d, a, b, c,  3, 10, T54);
+  SET(c, d, a, b, 10, 15, T55);
+  SET(b, c, d, a,  1, 21, T56);
+  SET(a, b, c, d,  8,  6, T57);
+  SET(d, a, b, c, 15, 10, T58);
+  SET(c, d, a, b,  6, 15, T59);
+  SET(b, c, d, a, 13, 21, T60);
+  SET(a, b, c, d,  4,  6, T61);
+  SET(d, a, b, c, 11, 10, T62);
+  SET(c, d, a, b,  2, 15, T63);
+  SET(b, c, d, a,  9, 21, T64);
+
 #undef SET
 
-     /* Then perform the following additions. (That is increment each
-        of the four registers by the value it had before this block
-        was started.) */
-    pms->abcd[0] += a;
-    pms->abcd[1] += b;
-    pms->abcd[2] += c;
-    pms->abcd[3] += d;
+  // Then perform the following additions. (That is increment each of the four
+  // registers by the value it had before this block was started.)
+  pms->abcd[0] += a;
+  pms->abcd[1] += b;
+  pms->abcd[2] += c;
+  pms->abcd[3] += d;
 }
 
+
+//
+// '_pdfioCryptoMD5Init()' - Initialize an MD5 hash.
+//
+
 void
-_pdfioCryptoMD5Init(_pdfio_md5_t *pms)
+_pdfioCryptoMD5Init(_pdfio_md5_t *pms)	// I - MD5 state
 {
     pms->count[0] = pms->count[1] = 0;
-    pms->abcd[0] = 0x67452301;
-    pms->abcd[1] = 0xefcdab89;
-    pms->abcd[2] = 0x98badcfe;
-    pms->abcd[3] = 0x10325476;
+    pms->abcd[0]  = 0x67452301;
+    pms->abcd[1]  = 0xefcdab89;
+    pms->abcd[2]  = 0x98badcfe;
+    pms->abcd[3]  = 0x10325476;
 }
 
+
+//
+// '_pdfioCryptoMD5Append()' - Append bytes to the MD5 hash.
+//
+
 void
-_pdfioCryptoMD5Append(_pdfio_md5_t *pms, const uint8_t *data, size_t nbytes)
+_pdfioCryptoMD5Append(
+    _pdfio_md5_t  *pms,			// I - MD5 state
+    const uint8_t *data,		// I - Data to add
+    size_t        nbytes)		// I - Number of bytes
 {
-    const uint8_t *p = data;
-    size_t left = nbytes;
-    size_t offset = (pms->count[0] >> 3) & 63;
-    uint32_t nbits = (uint32_t)(nbytes << 3);
+  const uint8_t	*p = data;		// Pointer into data
+  size_t	left = nbytes;		// Remaining bytes
+  size_t	offset = (pms->count[0] >> 3) & 63;
+					// Offset into state
+  uint32_t	nbits = (uint32_t)(nbytes << 3);
+					// Number of bits to add
 
-    if (nbytes == 0)
-	return;
 
-    /* Update the message length. */
-    pms->count[1] += (unsigned)(nbytes >> 29);
-    pms->count[0] += nbits;
-    if (pms->count[0] < nbits)
-	pms->count[1]++;
+  if (nbytes == 0)
+    return;
 
-    /* Process an initial partial block. */
-    if (offset) {
-	size_t copy = (offset + nbytes > 64 ? 64 - offset : nbytes);
+  // Update the message length.
+  pms->count[1] += (unsigned)(nbytes >> 29);
+  pms->count[0] += nbits;
+  if (pms->count[0] < nbits)
+    pms->count[1] ++;
 
-	memcpy(pms->buf + offset, p, copy);
-	if (offset + copy < 64)
-	    return;
-	p += copy;
-	left -= copy;
-	md5_process(pms, pms->buf);
-    }
+  // Process an initial partial block.
+  if (offset)
+  {
+    size_t copy = ((offset + nbytes) > 64 ? 64 - offset : nbytes);
+					// Number of bytes to copy
 
-    /* Process full blocks. */
-    for (; left >= 64; p += 64, left -= 64)
-	md5_process(pms, p);
+    memcpy(pms->buf + offset, p, copy);
 
-    /* Process a final partial block. */
-    if (left)
-	memcpy(pms->buf, p, left);
+    if ((offset + copy) < 64)
+      return;
+
+    p    += copy;
+    left -= copy;
+
+    md5_process(pms, pms->buf);
+  }
+
+  // Process full blocks.
+  for (; left >= 64; p += 64, left -= 64)
+    md5_process(pms, p);
+
+  // Copy a final partial block.
+  if (left)
+    memcpy(pms->buf, p, left);
 }
 
+
+//
+// '_pdfioCryptoMD5Finish()' - Finalize the MD5 hash.
+//
+
 void
-_pdfioCryptoMD5Finish(_pdfio_md5_t *pms, uint8_t digest[16])
+_pdfioCryptoMD5Finish(
+    _pdfio_md5_t *pms,			// I - MD5 state
+    uint8_t      digest[16])		// O - Digest value
 {
-    static const uint8_t pad[64] = {
-	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
-    };
-    uint8_t data[8];
-    int i;
+  int		i;			// Looping var
+  uint8_t	data[8];		// Digest length data
+  static const uint8_t pad[64] =	// Padding bytes
+  {
+    0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+  };
 
-    /* Save the length before padding. */
-    for (i = 0; i < 8; ++i)
-	data[i] = (uint8_t)(pms->count[i >> 2] >> ((i & 3) << 3));
-    /* Pad to 56 bytes mod 64. */
-    _pdfioCryptoMD5Append(pms, pad, ((55 - (pms->count[0] >> 3)) & 63) + 1);
-    /* Append the length. */
-    _pdfioCryptoMD5Append(pms, data, 8);
-    for (i = 0; i < 16; ++i)
-	digest[i] = (uint8_t)(pms->abcd[i >> 2] >> ((i & 3) << 3));
+
+  // Save the length before padding.
+  for (i = 0; i < 8; ++i)
+    data[i] = (uint8_t)(pms->count[i >> 2] >> ((i & 3) << 3));
+
+  // Pad to 56 bytes mod 64.
+  _pdfioCryptoMD5Append(pms, pad, ((55 - (pms->count[0] >> 3)) & 63) + 1);
+
+  // Append the length.
+  _pdfioCryptoMD5Append(pms, data, 8);
+
+  // Copy the digest from the state...
+  for (i = 0; i < 16; ++i)
+    digest[i] = (uint8_t)(pms->abcd[i >> 2] >> ((i & 3) << 3));
 }

pdfio-object.c

@@ -1,26 +1,15 @@
 //
 // PDF object functions for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 
 
-//
-// Local functions...
-//
-
-static bool	write_obj_header(pdfio_obj_t *obj);
-
-
 //
 // 'pdfioObjClose()' - Close an object, writing any data as needed to the PDF
 //                     file.
@@ -46,7 +35,7 @@ pdfioObjClose(pdfio_obj_t *obj)		// I - Object
   if (!obj->offset)
   {
     // Write the object value
-    if (!write_obj_header(obj))
+    if (!_pdfioObjWriteHeader(obj))
       return (false);
 
     // Write the "endobj" line...
@@ -103,7 +92,7 @@ pdfioObjCopy(pdfio_file_t *pdf,		// I - PDF file
     return (NULL);
 
   if (dstobj->value.type == PDFIO_VALTYPE_DICT)
-    _pdfioDictClear(dstobj->value.value.dict, "Length");
+    pdfioDictClear(dstobj->value.value.dict, "Length");
 
   if (srcobj->stream_offset)
   {
@@ -199,7 +188,7 @@ pdfioObjCreateStream(
     }
   }
 
-  if (!write_obj_header(obj))
+  if (!_pdfioObjWriteHeader(obj))
     return (NULL);
 
   if (!_pdfioFilePuts(obj->pdf, "stream\n"))
@@ -209,7 +198,7 @@ pdfioObjCreateStream(
   obj->pdf->current_obj = obj;
 
   // Return the new stream...
-  return (_pdfioStreamCreate(obj, length_obj, filter));
+  return (_pdfioStreamCreate(obj, length_obj, 0, filter));
 }
 
 
@@ -221,8 +210,13 @@ void
 _pdfioObjDelete(pdfio_obj_t *obj)	// I - Object
 {
   if (obj)
+  {
     pdfioStreamClose(obj->stream);
 
+    if (obj->datafree)
+      (obj->datafree)(obj->data);
+  }
+
   free(obj);
 }
 
@@ -267,6 +261,17 @@ pdfioObjGetDict(pdfio_obj_t *obj)	// I - Object
 }
 
 
+//
+// '_pdfioObjGetExtension()' - Get the extension pointer for an object.
+//
+
+void *					// O - Extension data
+_pdfioObjGetExtension(pdfio_obj_t *obj)	// I - Object
+{
+  return (obj->data);
+}
+
+
 //
 // 'pdfioObjGetGeneration()' - Get the object's generation number.
 //
@@ -302,7 +307,8 @@ pdfioObjGetLength(pdfio_obj_t *obj)	// I - Object
 
   if ((lenobj = pdfioDictGetObj(obj->value.value.dict, "Length")) == NULL)
   {
-    _pdfioFileError(obj->pdf, "Unable to get length of stream.");
+    if (!_pdfioDictGetValue(obj->value.value.dict, "Length"))
+      _pdfioFileError(obj->pdf, "Unable to get length of stream.");
     return (0);
   }
 
@@ -321,6 +327,26 @@ pdfioObjGetLength(pdfio_obj_t *obj)	// I - Object
 }
 
 
+//
+// 'pdfioObjGetName()' - Get the name value associated with an object.
+//
+
+const char *				// O - Dictionary or `NULL` on error
+pdfioObjGetName(pdfio_obj_t *obj)	// I - Object
+{
+  if (!obj)
+    return (NULL);
+
+  if (obj->value.type == PDFIO_VALTYPE_NONE)
+    _pdfioObjLoad(obj);
+
+  if (obj->value.type == PDFIO_VALTYPE_NAME)
+    return (obj->value.value.name);
+  else
+    return (NULL);
+}
+
+
 //
 // 'pdfioObjGetNumber()' - Get the object's number.
 //
@@ -335,8 +361,21 @@ pdfioObjGetNumber(pdfio_obj_t *obj)	// I - Object
 //
 // 'pdfioObjGetSubtype()' - Get an object's subtype.
 //
+// This function returns an object's PDF subtype name, if any.  Common subtype
+// names include:
+//
+// - "CIDFontType0": A CID Type0 font
+// - "CIDFontType2": A CID TrueType font
+// - "Image": An image or image mask
+// - "Form": A fillable form
+// - "OpenType": An OpenType font
+// - "Type0": A composite font
+// - "Type1": A PostScript Type1 font
+// - "Type3": A PDF Type3 font
+// - "TrueType": A TrueType font
+//
 
-const char *				// O - Object subtype
+const char *				// O - Object subtype name or `NULL` for none
 pdfioObjGetSubtype(pdfio_obj_t *obj)	// I - Object
 {
   pdfio_dict_t	*dict;			// Object dictionary
@@ -352,8 +391,21 @@ pdfioObjGetSubtype(pdfio_obj_t *obj)	// I - Object
 //
 // 'pdfioObjGetType()' - Get an object's type.
 //
+// This function returns an object's PDF type name, if any. Common type names
+// include:
+//
+// - "CMap": A character map for composite fonts
+// - "Font": An embedded font (@link pdfioObjGetSubtype@ will tell you the
+//   font format)
+// - "FontDescriptor": A font descriptor
+// - "Page": A (visible) page
+// - "Pages": A page tree node
+// - "Template": An invisible template page
+// - "XObject": An image, image mask, or form (@link pdfioObjGetSubtype@ will
+//   tell you which)
+//
 
-const char *				// O - Object type
+const char *				// O - Object type name or `NULL` for none
 pdfioObjGetType(pdfio_obj_t *obj)	// I - Object
 {
   pdfio_dict_t	*dict;			// Object dictionary
@@ -441,9 +493,7 @@ _pdfioObjLoad(pdfio_obj_t *obj)		// I - Object
     return (false);
   }
 
-  PDFIO_DEBUG("_pdfioObjLoad: tb.bufptr=%p, tb.bufend=%p, tb.bufptr[0]=0x%02x, tb.bufptr[0]=0x%02x\n", tb.bufptr, tb.bufend, tb.bufptr[0], tb.bufptr[1]);
-  if (tb.bufptr && tb.bufptr < tb.bufend && (tb.bufptr[0] == 0x0d || tb.bufptr[0] == 0x0a))
-    tb.bufptr ++;			// Skip trailing CR or LF after token
+  PDFIO_DEBUG("_pdfioObjLoad: tb.bufptr=%p, tb.bufend=%p, tb.bufptr[0]=0x%02x, tb.bufptr[1]=0x%02x\n", tb.bufptr, tb.bufend, tb.bufptr[0], tb.bufptr[1]);
 
   _pdfioTokenFlush(&tb);
 
@@ -454,6 +504,18 @@ _pdfioObjLoad(pdfio_obj_t *obj)		// I - Object
     PDFIO_DEBUG("_pdfioObjLoad: stream_offset=%lu.\n", (unsigned long)obj->stream_offset);
   }
 
+  // Decrypt as needed...
+  if (obj->pdf->encryption)
+  {
+    PDFIO_DEBUG("_pdfioObjLoad: Decrypting value...\n");
+
+    if (!_pdfioValueDecrypt(obj->pdf, obj, &obj->value, 0))
+    {
+      PDFIO_DEBUG("_pdfioObjLoad: Failed to decrypt.\n");
+      return (false);
+    }
+  }
+
   PDFIO_DEBUG("_pdfioObjLoad: ");
   PDFIO_DEBUG_VALUE(&obj->value);
   PDFIO_DEBUG("\n");
@@ -499,11 +561,26 @@ pdfioObjOpenStream(pdfio_obj_t *obj,	// I - Object
 
 
 //
-// 'write_obj_header()' - Write the object header...
+// '_pdfioObjSetExtension()' - Set extension data for an object.
 //
 
-static bool				// O - `true` on success, `false` on failure
-write_obj_header(pdfio_obj_t *obj)	// I - Object
+void
+_pdfioObjSetExtension(
+    pdfio_obj_t      *obj,		// I - Object
+    void             *data,		// I - Data
+    _pdfio_extfree_t datafree)		// I - Free function
+{
+  obj->data     = data;
+  obj->datafree = datafree;
+}
+
+
+//
+// '_pdfioObjWriteHeader()' - Write the object header...
+//
+
+bool					// O - `true` on success, `false` on failure
+_pdfioObjWriteHeader(pdfio_obj_t *obj)	// I - Object
 {
   obj->offset = _pdfioFileTell(obj->pdf);
 

pdfio-page.c

@@ -7,10 +7,6 @@
 // information.
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 
 

pdfio-private.h

@@ -1,7 +1,7 @@
 //
 // Private header file for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -20,6 +20,7 @@
 #  include <errno.h>
 #  include <inttypes.h>
 #  include <fcntl.h>
+#  include <locale.h>
 #  ifdef _WIN32
 #    include <io.h>
 #    include <direct.h>
@@ -37,9 +38,11 @@
 #    define unlink	_unlink
 #    define vsnprintf	_vsnprintf
 #    define write	_write
-#    define F_OK	00		// POSIX parameters/flags
-#    define W_OK	02
-#    define R_OK	04
+#    ifndef F_OK
+#      define F_OK	00		// POSIX parameters/flags
+#      define W_OK	02
+#      define R_OK	04
+#    endif // !F_OK
 #    define O_RDONLY	_O_RDONLY	// Map standard POSIX open flags
 #    define O_WRONLY	_O_WRONLY
 #    define O_CREAT	_O_CREAT
@@ -91,6 +94,10 @@
 //
 
 #  define PDFIO_MAX_DEPTH	32	// Maximum nesting depth for values
+#  define PDFIO_MAX_STRING	65536	// Maximum length of string
+
+typedef void (*_pdfio_extfree_t)(void *);
+					// Extension data free function
 
 typedef enum _pdfio_mode_e		// Read/write mode
 {
@@ -101,7 +108,7 @@ typedef enum _pdfio_mode_e		// Read/write mode
 typedef enum _pdfio_predictor_e		// PNG predictor constants
 {
   _PDFIO_PREDICTOR_NONE = 1,		// No predictor (default)
-  _PDFIO_PREDICTOR_TIFF2 = 2,		// TIFF2 predictor (???)
+  _PDFIO_PREDICTOR_TIFF2 = 2,		// TIFF predictor 2 (difference from left neighbor)
   _PDFIO_PREDICTOR_PNG_NONE = 10,	// PNG None predictor (same as `_PDFIO_PREDICTOR_NONE`)
   _PDFIO_PREDICTOR_PNG_SUB = 11,	// PNG Sub predictor
   _PDFIO_PREDICTOR_PNG_UP = 12,		// PNG Up predictor
@@ -218,9 +225,18 @@ typedef struct _pdfio_objmap_s		// PDF object map
   size_t	src_number;		// Source object number
 } _pdfio_objmap_t;
 
+typedef struct _pdfio_strbuf_s		// PDF string buffer
+{
+  struct _pdfio_strbuf_s *next;		// Next string buffer
+  bool		bufused;		// Is this string buffer being used?
+  char		buffer[PDFIO_MAX_STRING + 32];
+					// String buffer
+} _pdfio_strbuf_t;
+
 struct _pdfio_file_s			// PDF file structure
 {
   char		*filename;		// Filename
+  struct lconv	*loc;			// Locale data
   char		*version;		// Version number
   pdfio_rect_t	media_box,		// Default MediaBox value
 		crop_box;		// Default CropBox value
@@ -234,7 +250,8 @@ struct _pdfio_file_s			// PDF file structure
   pdfio_permission_t permissions;	// Access permissions (encrypted PDF files)
   uint8_t	file_key[16],		// File encryption key
 		owner_key[32],		// Owner encryption key
-		user_key[32];		// User encryption key
+		user_key[32],		// User encryption key
+		password[32];		// Padded password
   size_t	file_keylen,		// Length of file encryption key
 		owner_keylen,		// Length of owner encryption key
 		user_keylen;		// Length of user encryption key
@@ -262,7 +279,8 @@ struct _pdfio_file_s			// PDF file structure
 		alloc_dicts;		// Allocated dictionaries
   pdfio_dict_t	**dicts;		// Dictionaries
   size_t	num_objs,		// Number of objects
-		alloc_objs;		// Allocated objects
+		alloc_objs,		// Allocated objects
+		last_obj;		// Last object added
   pdfio_obj_t	**objs,			// Objects
 		*current_obj;		// Current object being written/read
   size_t	num_objmaps,		// Number of object maps
@@ -274,6 +292,7 @@ struct _pdfio_file_s			// PDF file structure
   size_t	num_strings,		// Number of strings
 		alloc_strings;		// Allocated strings
   char		**strings;		// Nul-terminated strings
+  _pdfio_strbuf_t *strbuffers;		// String buffers
 };
 
 struct _pdfio_obj_s			// Object
@@ -287,6 +306,8 @@ struct _pdfio_obj_s			// Object
   size_t	stream_length;		// Length of stream, if any
   _pdfio_value_t value;			// Dictionary/number/etc. value
   pdfio_stream_t *stream;		// Open stream, if any
+  void		*data;			// Extension data, if any
+  _pdfio_extfree_t datafree;		// Free callback for extension data
 };
 
 struct _pdfio_stream_s			// Stream
@@ -302,8 +323,9 @@ struct _pdfio_stream_s			// Stream
   z_stream	flate;			// Flate filter state
   _pdfio_predictor_t predictor;		// Predictor function, if any
   size_t	pbpixel,		// Size of a pixel in bytes
-		pbsize;			// Predictor buffer size, if any
-  unsigned char	cbuffer[4096],		// Compressed data buffer
+		pbsize,			// Predictor buffer size, if any
+		cbsize;			// Compressed data buffer size
+  unsigned char	*cbuffer,		// Compressed data buffer
 		*prbuffer,		// Raw buffer (previous line), as needed
 		*psbuffer;		// PNG filter buffer, as needed
   _pdfio_crypto_cb_t crypto_cb;		// Encryption/descryption callback, if any
@@ -315,6 +337,11 @@ struct _pdfio_stream_s			// Stream
 // Functions...
 //
 
+extern size_t		_pdfio_strlcpy(char *dst, const char *src, size_t dstsize) _PDFIO_INTERNAL;
+extern double		_pdfio_strtod(pdfio_file_t *pdf, const char *s) _PDFIO_INTERNAL;
+extern ssize_t		_pdfio_vsnprintf(pdfio_file_t *pdf, char *buffer, size_t bufsize, const char *format, va_list ap) _PDFIO_INTERNAL;
+
+extern bool		_pdfioArrayDecrypt(pdfio_file_t *pdf, pdfio_obj_t *obj, pdfio_array_t *a, size_t depth) _PDFIO_INTERNAL;
 extern void		_pdfioArrayDebug(pdfio_array_t *a, FILE *fp) _PDFIO_INTERNAL;
 extern void		_pdfioArrayDelete(pdfio_array_t *a) _PDFIO_INTERNAL;
 extern _pdfio_value_t	*_pdfioArrayGetValue(pdfio_array_t *a, size_t n) _PDFIO_INTERNAL;
@@ -338,7 +365,7 @@ extern void		_pdfioCryptoSHA256Init(_pdfio_sha256_t *ctx) _PDFIO_INTERNAL;
 extern void		_pdfioCryptoSHA256Finish(_pdfio_sha256_t *ctx, uint8_t *Message_Digest) _PDFIO_INTERNAL;
 extern bool		_pdfioCryptoUnlock(pdfio_file_t *pdf, pdfio_password_cb_t password_cb, void *password_data) _PDFIO_INTERNAL;
 
-extern void		_pdfioDictClear(pdfio_dict_t *dict, const char *key) _PDFIO_INTERNAL;
+extern bool		_pdfioDictDecrypt(pdfio_file_t *pdf, pdfio_obj_t *obj, pdfio_dict_t *dict, size_t depth) _PDFIO_INTERNAL;
 extern void		_pdfioDictDebug(pdfio_dict_t *dict, FILE *fp) _PDFIO_INTERNAL;
 extern void		_pdfioDictDelete(pdfio_dict_t *dict) _PDFIO_INTERNAL;
 extern _pdfio_value_t	*_pdfioDictGetValue(pdfio_dict_t *dict, const char *key) _PDFIO_INTERNAL;
@@ -351,13 +378,13 @@ extern bool		_pdfioFileAddPage(pdfio_file_t *pdf, pdfio_obj_t *obj) _PDFIO_INTER
 extern bool		_pdfioFileConsume(pdfio_file_t *pdf, size_t bytes) _PDFIO_INTERNAL;
 extern pdfio_obj_t	*_pdfioFileCreateObj(pdfio_file_t *pdf, pdfio_file_t *srcpdf, _pdfio_value_t *value) _PDFIO_INTERNAL;
 extern bool		_pdfioFileDefaultError(pdfio_file_t *pdf, const char *message, void *data) _PDFIO_INTERNAL;
-extern bool		_pdfioFileError(pdfio_file_t *pdf, const char *format, ...) _PDFIO_FORMAT(2,3) _PDFIO_INTERNAL;
+extern bool		_pdfioFileError(pdfio_file_t *pdf, const char *format, ...) _PDFIO_INTERNAL;
 extern pdfio_obj_t	*_pdfioFileFindMappedObj(pdfio_file_t *pdf, pdfio_file_t *src_pdf, size_t src_number) _PDFIO_INTERNAL;
 extern bool		_pdfioFileFlush(pdfio_file_t *pdf) _PDFIO_INTERNAL;
 extern int		_pdfioFileGetChar(pdfio_file_t *pdf) _PDFIO_INTERNAL;
 extern bool		_pdfioFileGets(pdfio_file_t *pdf, char *buffer, size_t bufsize) _PDFIO_INTERNAL;
 extern ssize_t		_pdfioFilePeek(pdfio_file_t *pdf, void *buffer, size_t bytes) _PDFIO_INTERNAL;
-extern bool		_pdfioFilePrintf(pdfio_file_t *pdf, const char *format, ...) _PDFIO_FORMAT(2,3) _PDFIO_INTERNAL;
+extern bool		_pdfioFilePrintf(pdfio_file_t *pdf, const char *format, ...) _PDFIO_INTERNAL;
 extern bool		_pdfioFilePuts(pdfio_file_t *pdf, const char *s) _PDFIO_INTERNAL;
 extern ssize_t		_pdfioFileRead(pdfio_file_t *pdf, void *buffer, size_t bytes) _PDFIO_INTERNAL;
 extern off_t		_pdfioFileSeek(pdfio_file_t *pdf, off_t offset, int whence) _PDFIO_INTERNAL;
@@ -365,11 +392,16 @@ extern off_t		_pdfioFileTell(pdfio_file_t *pdf) _PDFIO_INTERNAL;
 extern bool		_pdfioFileWrite(pdfio_file_t *pdf, const void *buffer, size_t bytes) _PDFIO_INTERNAL;
 
 extern void		_pdfioObjDelete(pdfio_obj_t *obj) _PDFIO_INTERNAL;
+extern void		*_pdfioObjGetExtension(pdfio_obj_t *obj) _PDFIO_INTERNAL;
 extern bool		_pdfioObjLoad(pdfio_obj_t *obj) _PDFIO_INTERNAL;
+extern void		_pdfioObjSetExtension(pdfio_obj_t *obj, void *data, _pdfio_extfree_t datafree) _PDFIO_INTERNAL;
+extern bool		_pdfioObjWriteHeader(pdfio_obj_t *obj) _PDFIO_INTERNAL;
 
-extern pdfio_stream_t	*_pdfioStreamCreate(pdfio_obj_t *obj, pdfio_obj_t *length_obj, pdfio_filter_t compression) _PDFIO_INTERNAL;
+extern pdfio_stream_t	*_pdfioStreamCreate(pdfio_obj_t *obj, pdfio_obj_t *length_obj, size_t cbsize, pdfio_filter_t compression) _PDFIO_INTERNAL;
 extern pdfio_stream_t	*_pdfioStreamOpen(pdfio_obj_t *obj, bool decode) _PDFIO_INTERNAL;
 
+extern char		*_pdfioStringAllocBuffer(pdfio_file_t *pdf);
+extern void		_pdfioStringFreeBuffer(pdfio_file_t *pdf, char *buffer);
 extern bool		_pdfioStringIsAllocated(pdfio_file_t *pdf, const char *s) _PDFIO_INTERNAL;
 
 extern void		_pdfioTokenClear(_pdfio_token_t *tb) _PDFIO_INTERNAL;
@@ -380,6 +412,7 @@ extern void		_pdfioTokenPush(_pdfio_token_t *tb, const char *token) _PDFIO_INTER
 extern bool		_pdfioTokenRead(_pdfio_token_t *tb, char *buffer, size_t bufsize);
 
 extern _pdfio_value_t	*_pdfioValueCopy(pdfio_file_t *pdfdst, _pdfio_value_t *vdst, pdfio_file_t *pdfsrc, _pdfio_value_t *vsrc) _PDFIO_INTERNAL;
+extern bool		_pdfioValueDecrypt(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_value_t *v, size_t depth) _PDFIO_INTERNAL;
 extern void		_pdfioValueDebug(_pdfio_value_t *v, FILE *fp) _PDFIO_INTERNAL;
 extern void		_pdfioValueDelete(_pdfio_value_t *v) _PDFIO_INTERNAL;
 extern _pdfio_value_t	*_pdfioValueRead(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_token_t *ts, _pdfio_value_t *v, size_t depth) _PDFIO_INTERNAL;

pdfio-stream.c

@@ -1,16 +1,12 @@
 //
 // PDF stream functions for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 
 
@@ -54,7 +50,7 @@ pdfioStreamClose(pdfio_stream_t *st)	// I - Stream
 
       while ((status = deflate(&st->flate, Z_FINISH)) != Z_STREAM_END)
       {
-        size_t	bytes = sizeof(st->cbuffer) - st->flate.avail_out,
+        size_t	bytes = st->cbsize - st->flate.avail_out,
 					// Bytes to write
 		outbytes;		// Actual bytes written
 
@@ -93,13 +89,13 @@ pdfioStreamClose(pdfio_stream_t *st)	// I - Stream
         }
 
 	st->flate.next_out  = (Bytef *)st->cbuffer + bytes;
-	st->flate.avail_out = (uInt)(sizeof(st->cbuffer) - bytes);
+	st->flate.avail_out = (uInt)(st->cbsize - bytes);
       }
 
-      if (st->flate.avail_out < (uInt)sizeof(st->cbuffer))
+      if (st->flate.avail_out < (uInt)st->cbsize)
       {
         // Write any residuals...
-        size_t bytes = sizeof(st->cbuffer) - st->flate.avail_out;
+        size_t bytes = st->cbsize - st->flate.avail_out;
 					// Bytes to write
 
 	if (st->crypto_cb)
@@ -144,7 +140,7 @@ pdfioStreamClose(pdfio_stream_t *st)	// I - Stream
     // Update the length as needed...
     if (st->length_obj)
     {
-      st->length_obj->value.value.number = st->obj->stream_length;
+      st->length_obj->value.value.number = (double)st->obj->stream_length;
       pdfioObjClose(st->length_obj);
     }
     else if (st->obj->length_offset)
@@ -176,6 +172,7 @@ pdfioStreamClose(pdfio_stream_t *st)	// I - Stream
 
   st->pdf->current_obj = NULL;
 
+  free(st->cbuffer);
   free(st->prbuffer);
   free(st->psbuffer);
   free(st);
@@ -194,6 +191,7 @@ pdfio_stream_t *			// O - Stream or `NULL` on error
 _pdfioStreamCreate(
     pdfio_obj_t    *obj,		// I - Object
     pdfio_obj_t    *length_obj,		// I - Length object, if any
+    size_t         cbsize,		// I - Size of compression buffer
     pdfio_filter_t compression)		// I - Compression to apply
 {
   pdfio_stream_t	*st;		// Stream
@@ -306,8 +304,21 @@ _pdfioStreamCreate(
     else
       st->predictor = _PDFIO_PREDICTOR_NONE;
 
+    if (cbsize == 0)
+      cbsize = 4096;
+
+    st->cbsize = cbsize;
+    if ((st->cbuffer = malloc(cbsize)) == NULL)
+    {
+      _pdfioFileError(st->pdf, "Unable to allocate %lu bytes for Flate output buffer: %s", (unsigned long)cbsize, strerror(errno));
+      free(st->prbuffer);
+      free(st->psbuffer);
+      free(st);
+      return (NULL);
+    }
+
     st->flate.next_out  = (Bytef *)st->cbuffer;
-    st->flate.avail_out = (uInt)sizeof(st->cbuffer);
+    st->flate.avail_out = (uInt)cbsize;
 
     if ((status = deflateInit(&(st->flate), 9)) != Z_OK)
     {
@@ -366,15 +377,16 @@ pdfioStreamConsume(pdfio_stream_t *st,	// I - Stream
 //
 // 'pdfioStreamGetToken()' - Read a single PDF token from a stream.
 //
-// This function reads a single PDF token from a stream.  Operator tokens,
-// boolean values, and numbers are returned as-is in the provided string buffer.
-// String values start with the opening parenthesis ('(') but have all escaping
-// resolved and the terminating parenthesis removed.  Hexadecimal string values
-// start with the opening angle bracket ('<') and have all whitespace and the
-// terminating angle bracket removed.
+// This function reads a single PDF token from a stream, skipping all whitespace
+// and comments.  Operator tokens, boolean values, and numbers are returned
+// as-is in the provided string buffer.  String values start with the opening
+// parenthesis ('(') but have all escaping resolved and the terminating
+// parenthesis removed.  Hexadecimal string values start with the opening angle
+// bracket ('<') and have all whitespace and the terminating angle bracket
+// removed.
 //
 
-bool					// O - `true` on success, `false` on EOF
+bool					// O - `true` on success, `false` on end-of-stream or error
 pdfioStreamGetToken(
     pdfio_stream_t *st,			// I - Stream
     char           *buffer,		// I - String buffer
@@ -412,6 +424,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
   pdfio_stream_t	*st;		// Stream
   pdfio_dict_t		*dict = pdfioObjGetDict(obj);
 					// Object dictionary
+  const char		*type;		// Object type
 
 
   PDFIO_DEBUG("_pdfioStreamOpen(obj=%p(%u), decode=%s)\n", obj, (unsigned)obj->number, decode ? "true" : "false");
@@ -426,19 +439,21 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
   st->pdf = obj->pdf;
   st->obj = obj;
 
-  if ((st->remaining = pdfioObjGetLength(obj)) == 0)
+  if ((st->remaining = pdfioObjGetLength(obj)) == 0 && !_pdfioDictGetValue(pdfioObjGetDict(obj), "Length"))
   {
-    free(st);
-    return (NULL);
+    _pdfioFileError(obj->pdf, "No stream data.");
+    goto error;
   }
 
   if (_pdfioFileSeek(st->pdf, obj->stream_offset, SEEK_SET) != obj->stream_offset)
   {
-    free(st);
-    return (NULL);
+    _pdfioFileError(obj->pdf, "Unable to seek to stream data.");
+    goto error;
   }
 
-  if (obj->pdf->encryption)
+  type = pdfioObjGetType(obj);
+
+  if (obj->pdf->encryption && (!type || strcmp(type, "XRef")))
   {
     uint8_t	iv[64];			// Initialization vector
     size_t	ivlen;			// Length of initialization vector, if any
@@ -446,11 +461,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
     ivlen = (size_t)_pdfioFilePeek(st->pdf, iv, sizeof(iv));
 
     if ((st->crypto_cb = _pdfioCryptoMakeReader(st->pdf, obj, &st->crypto_ctx, iv, &ivlen)) == NULL)
-    {
-      // TODO: Add error message?
-      free(st);
-      return (NULL);
-    }
+      goto error;
 
     PDFIO_DEBUG("_pdfioStreamOpen: ivlen=%d\n", (int)ivlen);
     if (ivlen > 0)
@@ -481,8 +492,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
       {
 	// TODO: Implement compound filters...
 	_pdfioFileError(st->pdf, "Unsupported compound stream filter.");
-	free(st);
-	return (NULL);
+	goto error;
       }
 
       // No filter, read as-is...
@@ -515,8 +525,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
       else if (bpc < 1 || bpc == 3 || (bpc > 4 && bpc < 8) || (bpc > 8 && bpc < 16) || bpc > 16)
       {
         _pdfioFileError(st->pdf, "Unsupported BitsPerColor value %d.", bpc);
-        free(st);
-        return (NULL);
+	goto error;
       }
 
       if (colors == 0)
@@ -526,8 +535,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
       else if (colors < 0 || colors > 4)
       {
         _pdfioFileError(st->pdf, "Unsupported Colors value %d.", colors);
-        free(st);
-        return (NULL);
+	goto error;
       }
 
       if (columns == 0)
@@ -537,15 +545,13 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
       else if (columns < 0)
       {
         _pdfioFileError(st->pdf, "Unsupported Columns value %d.", columns);
-        free(st);
-        return (NULL);
+	goto error;
       }
 
       if ((predictor > 2 && predictor < 10) || predictor > 15)
       {
         _pdfioFileError(st->pdf, "Unsupported Predictor function %d.", predictor);
-        free(st);
-        return (NULL);
+	goto error;
       }
       else if (predictor > 1)
       {
@@ -559,28 +565,31 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
         if ((st->prbuffer = calloc(1, st->pbsize - 1)) == NULL || (st->psbuffer = calloc(1, st->pbsize)) == NULL)
         {
           _pdfioFileError(st->pdf, "Unable to allocate %lu bytes for Predictor buffers.", (unsigned long)st->pbsize);
-	  free(st->prbuffer);
-	  free(st->psbuffer);
-	  free(st);
-	  return (NULL);
+	  goto error;
         }
       }
       else
+      {
         st->predictor = _PDFIO_PREDICTOR_NONE;
+      }
+
+      st->cbsize = 4096;
+      if ((st->cbuffer = malloc(st->cbsize)) == NULL)
+      {
+	_pdfioFileError(st->pdf, "Unable to allocate %lu bytes for Flate compression buffer.", (unsigned long)st->cbsize);
+	goto error;
+      }
 
       PDFIO_DEBUG("_pdfioStreamOpen: pos=%ld\n", (long)_pdfioFileTell(st->pdf));
-      if (sizeof(st->cbuffer) > st->remaining)
+      if (st->cbsize > st->remaining)
 	rbytes = _pdfioFileRead(st->pdf, st->cbuffer, st->remaining);
       else
-	rbytes = _pdfioFileRead(st->pdf, st->cbuffer, sizeof(st->cbuffer));
+	rbytes = _pdfioFileRead(st->pdf, st->cbuffer, st->cbsize);
 
       if (rbytes <= 0)
       {
 	_pdfioFileError(st->pdf, "Unable to read bytes for stream.");
-	free(st->prbuffer);
-	free(st->psbuffer);
-	free(st);
-	return (NULL);
+	goto error;
       }
 
       if (st->crypto_cb)
@@ -594,10 +603,7 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
       if ((status = inflateInit(&(st->flate))) != Z_OK)
       {
 	_pdfioFileError(st->pdf, "Unable to start Flate filter: %s", zstrerror(status));
-	free(st->prbuffer);
-	free(st->psbuffer);
-	free(st);
-	return (NULL);
+	goto error;
       }
 
       st->remaining -= st->flate.avail_in;
@@ -610,9 +616,8 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
     else
     {
       // Something else we don't support
-      _pdfioFileError(st->pdf, "Unsupported stream filter '/%s'.", filter);
-      free(st);
-      return (NULL);
+      _pdfioFileError(st->pdf, "Unsupported stream filter '%N'.", filter);
+      goto error;
     }
   }
   else
@@ -622,6 +627,16 @@ _pdfioStreamOpen(pdfio_obj_t *obj,	// I - Object
   }
 
   return (st);
+
+  // If we get here something went wrong...
+  error:
+
+  free(st->cbuffer);
+  free(st->prbuffer);
+  free(st->psbuffer);
+  free(st);
+  return (NULL);
+
 }
 
 
@@ -674,6 +689,10 @@ pdfioStreamPeek(pdfio_stream_t *st,	// I - Stream
 //
 // 'pdfioStreamPrintf()' - Write a formatted string to a stream.
 //
+// This function writes a formatted string to a stream.  In addition to the
+// standard `printf` format characters, you can use "%N" to format a PDF name
+// value ("/Name") and "%S" to format a PDF string ("(String)") value.
+//
 
 bool					// O - `true` on success, `false` on failure
 pdfioStreamPrintf(
@@ -691,7 +710,7 @@ pdfioStreamPrintf(
 
   // Format the string...
   va_start(ap, format);
-  vsnprintf(buffer, sizeof(buffer), format, ap);
+  _pdfio_vsnprintf(st->pdf, buffer, sizeof(buffer), format, ap);
   va_end(ap);
 
   // Write the string...
@@ -1046,10 +1065,10 @@ stream_read(pdfio_stream_t *st,		// I - Stream
       if (st->flate.avail_in == 0)
       {
 	// Read more from the file...
-	if (sizeof(st->cbuffer) > st->remaining)
+	if (st->cbsize > st->remaining)
 	  rbytes = _pdfioFileRead(st->pdf, st->cbuffer, st->remaining);
 	else
-	  rbytes = _pdfioFileRead(st->pdf, st->cbuffer, sizeof(st->cbuffer));
+	  rbytes = _pdfioFileRead(st->pdf, st->cbuffer, st->cbsize);
 
 	if (rbytes <= 0)
 	  return (-1);			// End of file...
@@ -1065,17 +1084,9 @@ stream_read(pdfio_stream_t *st,		// I - Stream
       st->flate.next_out  = (Bytef *)buffer;
       st->flate.avail_out = (uInt)bytes;
 
-      avail_in  = st->flate.avail_in;
-      avail_out = st->flate.avail_out;
-
       if ((status = inflate(&(st->flate), Z_NO_FLUSH)) < Z_OK)
       {
-	_pdfioFileError(st->pdf, "Unable to decompress stream data: %s", zstrerror(status));
-	return (-1);
-      }
-      else if (avail_in == st->flate.avail_in && avail_out == st->flate.avail_out)
-      {
-	_pdfioFileError(st->pdf, "Corrupt stream data.");
+	_pdfioFileError(st->pdf, "Unable to decompress stream data for object %ld: %s", (long)st->obj->number, zstrerror(status));
 	return (-1);
       }
 
@@ -1110,10 +1121,10 @@ stream_read(pdfio_stream_t *st,		// I - Stream
 	if (st->flate.avail_in == 0)
 	{
 	  // Read more from the file...
-	  if (sizeof(st->cbuffer) > st->remaining)
+	  if (st->cbsize > st->remaining)
 	    rbytes = _pdfioFileRead(st->pdf, st->cbuffer, st->remaining);
 	  else
-	    rbytes = _pdfioFileRead(st->pdf, st->cbuffer, sizeof(st->cbuffer));
+	    rbytes = _pdfioFileRead(st->pdf, st->cbuffer, st->cbsize);
 
 	  if (rbytes <= 0)
 	    return (-1);		// End of file...
@@ -1131,7 +1142,7 @@ stream_read(pdfio_stream_t *st,		// I - Stream
 
 	if ((status = inflate(&(st->flate), Z_NO_FLUSH)) < Z_OK)
 	{
-	  _pdfioFileError(st->pdf, "Unable to decompress stream data: %s", zstrerror(status));
+	  _pdfioFileError(st->pdf, "Unable to decompress stream data for object %ld: %s", (long)st->obj->number, zstrerror(status));
 	  return (-1);
 	}
 	else if (status == Z_STREAM_END || (avail_in == st->flate.avail_in && avail_out == st->flate.avail_out))
@@ -1180,10 +1191,10 @@ stream_read(pdfio_stream_t *st,		// I - Stream
 	if (st->flate.avail_in == 0)
 	{
 	  // Read more from the file...
-	  if (sizeof(st->cbuffer) > st->remaining)
+	  if (st->cbsize > st->remaining)
 	    rbytes = _pdfioFileRead(st->pdf, st->cbuffer, st->remaining);
 	  else
-	    rbytes = _pdfioFileRead(st->pdf, st->cbuffer, sizeof(st->cbuffer));
+	    rbytes = _pdfioFileRead(st->pdf, st->cbuffer, st->cbsize);
 
 	  if (rbytes <= 0)
 	    return (-1);		// End of file...
@@ -1201,7 +1212,7 @@ stream_read(pdfio_stream_t *st,		// I - Stream
 
 	if ((status = inflate(&(st->flate), Z_NO_FLUSH)) < Z_OK)
 	{
-	  _pdfioFileError(st->pdf, "Unable to decompress stream data: %s", zstrerror(status));
+	  _pdfioFileError(st->pdf, "Unable to decompress stream data for object %ld: %s", (long)st->obj->number, zstrerror(status));
 	  return (-1);
 	}
 	else if (status == Z_STREAM_END || (avail_in == st->flate.avail_in && avail_out == st->flate.avail_out))
@@ -1287,10 +1298,10 @@ stream_write(pdfio_stream_t *st,	// I - Stream
 
   while (st->flate.avail_in > 0)
   {
-    if (st->flate.avail_out < (sizeof(st->cbuffer) / 8))
+    if (st->flate.avail_out < (st->cbsize / 8))
     {
       // Flush the compression buffer...
-      size_t	cbytes = sizeof(st->cbuffer) - st->flate.avail_out,
+      size_t	cbytes = st->cbsize - st->flate.avail_out,
 		outbytes;
 
       if (st->crypto_cb)
@@ -1319,7 +1330,7 @@ stream_write(pdfio_stream_t *st,	// I - Stream
       }
 
       st->flate.next_out  = (Bytef *)st->cbuffer + cbytes;
-      st->flate.avail_out = (uInt)(sizeof(st->cbuffer) - cbytes);
+      st->flate.avail_out = (uInt)(st->cbsize - cbytes);
     }
 
     // Deflate what we can this time...

pdfio-string.c

@@ -1,16 +1,12 @@
 //
-// PDF dictionary functions for PDFio.
+// PDF string functions for PDFio.
 //
-// Copyright © 2021 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 
 
@@ -18,7 +14,557 @@
 // Local functions...
 //
 
-static int	compare_strings(char **a, char **b);
+static size_t	find_string(pdfio_file_t *pdf, const char *s, int *rdiff);
+
+
+//
+// '_pdfio_strlcpy()' - Safe string copy.
+//
+
+size_t					// O - Length of source string
+_pdfio_strlcpy(char       *dst,		// I - Destination string buffer
+               const char *src,		// I - Source string
+               size_t     dstsize)	// I - Size of destination
+{
+  size_t	srclen;			// Length of source string
+
+
+  // Range check input...
+  if (!dst || !src || dstsize == 0)
+  {
+    if (dst)
+      *dst = '\0';
+    return (0);
+  }
+
+  // Figure out how much room is needed...
+  dstsize --;
+
+  srclen = strlen(src);
+
+  // Copy the appropriate amount...
+  if (srclen <= dstsize)
+  {
+    // Source string will fit...
+    memmove(dst, src, srclen);
+    dst[srclen] = '\0';
+  }
+  else
+  {
+    // Source string too big, copy what we can and clean up the end...
+    char *ptr = dst + dstsize - 1,	// Pointer into string
+	*end = ptr + 1;			// Pointer to end of string
+
+    memmove(dst, src, dstsize);
+    dst[dstsize] = '\0';
+
+    // Validate last character in destination buffer...
+    if (ptr > dst && *ptr & 0x80)
+    {
+      while ((*ptr & 0xc0) == 0x80 && ptr > dst)
+	ptr --;
+
+      if ((*ptr & 0xe0) == 0xc0)
+      {
+	// Verify 2-byte UTF-8 sequence...
+	if ((end - ptr) != 2)
+	  *ptr = '\0';
+      }
+      else if ((*ptr & 0xf0) == 0xe0)
+      {
+	// Verify 3-byte UTF-8 sequence...
+	if ((end - ptr) != 3)
+	  *ptr = '\0';
+      }
+      else if ((*ptr & 0xf8) == 0xf0)
+      {
+	// Verify 4-byte UTF-8 sequence...
+	if ((end - ptr) != 4)
+	  *ptr = '\0';
+      }
+      else if (*ptr & 0x80)
+      {
+	// Invalid sequence at end...
+	*ptr = '\0';
+      }
+    }
+  }
+
+  return (srclen);
+}
+
+
+//
+// '_pdfio_strtod()' - Convert a string to a double value.
+//
+// This function wraps strtod() to avoid locale issues.
+//
+
+double					// O - Double value
+_pdfio_strtod(pdfio_file_t *pdf,	// I - PDF file
+              const char   *s)		// I - String
+{
+  char	temp[64],			// Temporary buffer
+	*tempptr;			// Pointer into temporary buffer
+
+
+  // See if the locale has a special decimal point string...
+  if (!pdf->loc)
+    return (strtod(s, NULL));
+
+  // Copy leading sign, numbers, period, and then numbers...
+  tempptr                = temp;
+  temp[sizeof(temp) - 1] = '\0';
+
+  while (*s && *s != '.')
+  {
+    if (tempptr < (temp + sizeof(temp) - 1))
+      *tempptr++ = *s++;
+    else
+      return (0.0);
+  }
+
+  if (*s == '.')
+  {
+    // Convert decimal point to locale equivalent...
+    size_t	declen = strlen(pdf->loc->decimal_point);
+					// Length of decimal point
+    s ++;
+
+    if (declen <= (sizeof(temp) - (size_t)(tempptr - temp)))
+    {
+      memcpy(tempptr, pdf->loc->decimal_point, declen);
+      tempptr += declen;
+    }
+    else
+    {
+      return (0.0);
+    }
+  }
+
+  // Copy any remaining characters...
+  while (*s)
+  {
+    if (tempptr < (temp + sizeof(temp) - 1))
+      *tempptr++ = *s++;
+    else
+      return (0.0);
+  }
+
+  // Nul-terminate the temporary string and convert the string...
+  *tempptr = '\0';
+
+  return (strtod(temp, NULL));
+}
+
+
+//
+// '_pdfio_vsnprintf()' - Format a string.
+//
+// This function emulates vsnprintf() to avoid locale issues.
+//
+
+ssize_t					// O - Number of bytes
+_pdfio_vsnprintf(pdfio_file_t *pdf,	// I - PDF file
+                 char         *buffer,	// I - Output buffer
+                 size_t       bufsize,	// I - Size of output buffer
+                 const char   *format,	// I - printf-style format string
+                 va_list      ap)	// I - Pointer to additional arguments
+{
+  char		*bufptr,		// Pointer to position in buffer
+		*bufend,		// Pointer to end of buffer
+		size,			// Size character (h, l, L)
+		type;			// Format type character
+  int		width,			// Width of field
+		prec;			// Number of characters of precision
+  char		tformat[100],		// Temporary format string for snprintf()
+		*tptr,			// Pointer into temporary format
+		temp[1024],		// Buffer for formatted numbers
+		*tempptr;		// Pointer into buffer
+  char		*s;			// Pointer to string
+  ssize_t	bytes;			// Total number of bytes needed
+  const char	*dec = pdf->loc ? pdf->loc->decimal_point : ".";
+					// Decimal point string
+  char		*decptr;		// Pointer to decimal point
+
+
+  // Loop through the format string, formatting as needed...
+  bufptr = buffer;
+  bufend = buffer + bufsize - 1;
+  bytes  = 0;
+
+  while (*format)
+  {
+    if (*format == '%')
+    {
+      // Format character...
+      tptr = tformat;
+      *tptr++ = *format++;
+
+      if (*format == '%')
+      {
+        if (bufptr < bufend)
+	  *bufptr++ = *format;
+        bytes ++;
+        format ++;
+	continue;
+      }
+      else if (strchr(" -+#\'", *format))
+      {
+        *tptr++ = *format++;
+      }
+
+      if (*format == '*')
+      {
+        // Get width from argument...
+	format ++;
+	width = va_arg(ap, int);
+
+	snprintf(tptr, sizeof(tformat) - (size_t)(tptr - tformat), "%d", width);
+	tptr += strlen(tptr);
+      }
+      else
+      {
+	width = 0;
+
+	while (isdigit(*format & 255))
+	{
+	  if (tptr < (tformat + sizeof(tformat) - 1))
+	    *tptr++ = *format;
+
+	  width = width * 10 + *format++ - '0';
+	}
+      }
+
+      if (*format == '.')
+      {
+	if (tptr < (tformat + sizeof(tformat) - 1))
+	  *tptr++ = *format;
+
+        format ++;
+
+        if (*format == '*')
+	{
+          // Get precision from argument...
+	  format ++;
+	  prec = va_arg(ap, int);
+
+	  snprintf(tptr, sizeof(tformat) - (size_t)(tptr - tformat), "%d", prec);
+	  tptr += strlen(tptr);
+	}
+	else
+	{
+	  while (isdigit(*format & 255))
+	  {
+	    if (tptr < (tformat + sizeof(tformat) - 1))
+	      *tptr++ = *format;
+
+            format ++;
+	  }
+	}
+      }
+
+      if (*format == 'l' && format[1] == 'l')
+      {
+        size = 'L';
+
+	if (tptr < (tformat + sizeof(tformat) - 2))
+	{
+	  *tptr++ = 'l';
+	  *tptr++ = 'l';
+	}
+
+	format += 2;
+      }
+      else if (*format == 'h' || *format == 'l' || *format == 'L')
+      {
+	if (tptr < (tformat + sizeof(tformat) - 1))
+	  *tptr++ = *format;
+
+        size = *format++;
+      }
+      else
+      {
+        size = 0;
+      }
+
+      if (!*format)
+        break;
+
+      if (tptr < (tformat + sizeof(tformat) - 1))
+        *tptr++ = *format;
+
+      type  = *format++;
+      *tptr = '\0';
+
+      switch (type)
+      {
+	case 'E' : // Floating point formats
+	case 'G' :
+	case 'e' :
+	case 'f' :
+	case 'g' :
+	    if ((size_t)(width + 2) > sizeof(temp))
+	      break;
+
+	    snprintf(temp, sizeof(temp), tformat, va_arg(ap, double));
+
+	    if ((decptr = strstr(temp, dec)) != NULL)
+	    {
+	      // Convert locale decimal point to "."
+	      PDFIO_DEBUG("_pdfio_vsnprintf: Before \"%s\"\n", temp);
+	      tempptr = decptr + strlen(dec);
+	      if (tempptr > (decptr + 1))
+	        memmove(decptr + 1, tempptr, strlen(tempptr) + 1);
+	      *decptr = '.';
+
+	      // Strip trailing 0's...
+	      for (tempptr = temp + strlen(temp) - 1; tempptr > temp && *tempptr == '0'; tempptr --)
+		*tempptr = '\0';
+
+	      if (*tempptr == '.')
+		*tempptr = '\0';	// Strip trailing decimal point
+
+	      PDFIO_DEBUG("_pdfio_vsnprintf: After \"%s\"\n", temp);
+	    }
+
+            // Copy to the output buffer
+            bytes += (int)strlen(temp);
+
+            if (bufptr < bufend)
+	    {
+	      _pdfio_strlcpy(bufptr, temp, (size_t)(bufend - bufptr + 1));
+	      bufptr += strlen(bufptr);
+	    }
+	    break;
+
+        case 'B' : // Integer formats
+	case 'X' :
+	case 'b' :
+        case 'd' :
+	case 'i' :
+	case 'o' :
+	case 'u' :
+	case 'x' :
+	    if ((size_t)(width + 2) > sizeof(temp))
+	      break;
+
+#  ifdef HAVE_LONG_LONG
+            if (size == 'L')
+	      snprintf(temp, sizeof(temp), tformat, va_arg(ap, long long));
+	    else
+#  endif // HAVE_LONG_LONG
+            if (size == 'l')
+	      snprintf(temp, sizeof(temp), tformat, va_arg(ap, long));
+	    else
+	      snprintf(temp, sizeof(temp), tformat, va_arg(ap, int));
+
+            bytes += (int)strlen(temp);
+
+	    if (bufptr < bufend)
+	    {
+	      _pdfio_strlcpy(bufptr, temp, (size_t)(bufend - bufptr + 1));
+	      bufptr += strlen(bufptr);
+	    }
+	    break;
+
+	case 'p' : // Pointer value
+	    if ((size_t)(width + 2) > sizeof(temp))
+	      break;
+
+	    snprintf(temp, sizeof(temp), tformat, va_arg(ap, void *));
+
+            bytes += (int)strlen(temp);
+
+	    if (bufptr < bufend)
+	    {
+	      _pdfio_strlcpy(bufptr, temp, (size_t)(bufend - bufptr + 1));
+	      bufptr += strlen(bufptr);
+	    }
+	    break;
+
+        case 'c' : // Character or character array
+	    bytes += width;
+
+	    if (bufptr < bufend)
+	    {
+	      if (width <= 1)
+	      {
+	        *bufptr++ = (char)va_arg(ap, int);
+	      }
+	      else
+	      {
+		if ((bufptr + width) > bufend)
+		  width = (int)(bufend - bufptr);
+
+		memcpy(bufptr, va_arg(ap, char *), (size_t)width);
+		bufptr += width;
+	      }
+	    }
+	    break;
+
+	case 'S' : // PDF string
+	    if ((s = va_arg(ap, char *)) == NULL)
+	      s = "(null)";
+
+            // PDF strings start with "("...
+            if (bufptr < bufend)
+              *bufptr++ = '(';
+
+            bytes ++;
+
+            // Loop through the literal string...
+            while (*s)
+            {
+              // Escape special characters
+              if (*s == '\\' || *s == '(' || *s == ')')
+              {
+                // Simple escape...
+                if (bufptr < bufend)
+                  *bufptr++ = '\\';
+
+                if (bufptr < bufend)
+                  *bufptr++ = *s;
+
+                bytes += 2;
+              }
+              else if (*s < ' ')
+              {
+                // Octal escape...
+                snprintf(bufptr, (size_t)(bufend - bufptr + 1), "\\%03o", *s & 255);
+                bufptr += strlen(bufptr);
+                bytes += 4;
+              }
+              else
+              {
+                // Literal character...
+                if (bufptr < bufend)
+                  *bufptr++ = *s;
+                bytes ++;
+              }
+
+              s ++;
+            }
+
+            // PDF strings end with ")"...
+            if (bufptr < bufend)
+              *bufptr++ = ')';
+
+            bytes ++;
+	    break;
+
+	case 's' : // Literal string
+	    if ((s = va_arg(ap, char *)) == NULL)
+	      s = "(null)";
+
+            if (width != 0)
+            {
+              // Format string to fit inside the specified width...
+	      if ((size_t)(width + 1) > sizeof(temp))
+	        break;
+
+              snprintf(temp, sizeof(temp), tformat, s);
+              s = temp;
+            }
+
+            bytes += strlen(s);
+
+	    if (bufptr < bufend)
+	    {
+	      _pdfio_strlcpy(bufptr, s, (size_t)(bufend - bufptr + 1));
+	      bufptr += strlen(bufptr);
+	    }
+	    break;
+
+        case 'N' : // Output name string with proper escaping
+	    if ((s = va_arg(ap, char *)) == NULL)
+	      s = "(null)";
+
+	    // PDF names start with "/"...
+            if (bufptr < bufend)
+              *bufptr++ = '/';
+
+            bytes ++;
+
+            // Loop through the name string...
+            while (*s)
+            {
+              if (*s < 0x21 || *s > 0x7e || *s == '#')
+              {
+                // Output #XX for character...
+                snprintf(bufptr, (size_t)(bufend - bufptr + 1), "#%02X", *s & 255);
+                bufptr += strlen(bufptr);
+                bytes += 3;
+              }
+              else
+              {
+                // Output literal character...
+                if (bufptr < bufend)
+                  *bufptr++ = *s;
+                bytes ++;
+              }
+
+              s ++;
+            }
+	    break;
+
+	case 'n' : // Output number of chars so far
+	    *(va_arg(ap, int *)) = (int)bytes;
+	    break;
+      }
+    }
+    else
+    {
+      // Literal character...
+      bytes ++;
+
+      if (bufptr < bufend)
+        *bufptr++ = *format++;
+    }
+  }
+
+  // Nul-terminate the string and return the number of characters needed.
+  *bufptr = '\0';
+
+  PDFIO_DEBUG("_pdfio_vsnprintf: Returning %ld \"%s\"\n", (long)bytes, buffer);
+
+  return (bytes);
+}
+
+
+//
+// '_pdfioStringAllocBuffer()' - Allocate a string buffer.
+//
+
+char *					// O - Buffer or `NULL` on error
+_pdfioStringAllocBuffer(
+    pdfio_file_t *pdf)			// I - PDF file
+{
+  _pdfio_strbuf_t	*current;	// Current string buffer
+
+
+  // See if we have an available string buffer...
+  for (current = pdf->strbuffers; current; current = current->next)
+  {
+    if (!current->bufused)
+    {
+      current->bufused = true;
+      return (current->buffer);
+    }
+  }
+
+  // Didn't find one, allocate a new one...
+  if ((current = calloc(1, sizeof(_pdfio_strbuf_t))) == NULL)
+    return (NULL);
+
+  // Add to the linked list of string buffers...
+  current->next    = pdf->strbuffers;
+  current->bufused = true;
+
+  pdf->strbuffers = current;
+
+  return (current->buffer);
+}
 
 
 //
@@ -36,8 +582,9 @@ pdfioStringCreate(
     pdfio_file_t *pdf,			// I - PDF file
     const char   *s)			// I - Nul-terminated string
 {
-  char	*news;				// New string
-  char	**match;			// Matching string
+  char		*news;			// New string
+  size_t	idx;			// Index into strings
+  int		diff;			// Different
 
 
   PDFIO_DEBUG("pdfioStringCreate(pdf=%p, s=\"%s\")\n", pdf, s);
@@ -47,8 +594,17 @@ pdfioStringCreate(
     return (NULL);
 
   // See if the string has already been added...
-  if (pdf->num_strings > 0 && (match = (char **)bsearch(&s, pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings)) != NULL)
-    return (*match);
+  if (pdf->num_strings > 0)
+  {
+    idx = find_string(pdf, s, &diff);
+    if (diff == 0)
+      return (pdf->strings[idx]);
+  }
+  else
+  {
+    idx  = 0;
+    diff = -1;
+  }
 
   // Not already added, so add it...
   if ((news = strdup(s)) == NULL)
@@ -69,11 +625,17 @@ pdfioStringCreate(
     pdf->alloc_strings += 128;
   }
 
-  // TODO: Change to insertion sort as needed...
-  pdf->strings[pdf->num_strings ++] = news;
+  // Insert the string...
+  if (diff > 0)
+    idx ++;
 
-  if (pdf->num_strings > 1)
-    qsort(pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings);
+  PDFIO_DEBUG("pdfioStringCreate: Inserting \"%s\" at %u\n", news, (unsigned)idx);
+
+  if (idx < pdf->num_strings)
+    memmove(pdf->strings + idx + 1, pdf->strings + idx, (pdf->num_strings - idx) * sizeof(char *));
+
+  pdf->strings[idx] = news;
+  pdf->num_strings ++;
 
   PDFIO_DEBUG("pdfioStringCreate: %lu strings\n", (unsigned long)pdf->num_strings);
 
@@ -115,6 +677,29 @@ pdfioStringCreatef(
 }
 
 
+//
+// '_pdfioStringFreeBuffer()' - Free a string buffer.
+//
+
+void
+_pdfioStringFreeBuffer(
+    pdfio_file_t *pdf,			// I - PDF file
+    char         *buffer)		// I - String buffer
+{
+  _pdfio_strbuf_t	*current;	// Current string buffer
+
+
+  for (current = pdf->strbuffers; current; current = current->next)
+  {
+    if (current->buffer == buffer)
+    {
+      current->bufused = false;
+      break;
+    }
+  }
+}
+
+
 //
 // '_pdfioStringIsAllocated()' - Check whether a string has been allocated.
 //
@@ -124,17 +709,67 @@ _pdfioStringIsAllocated(
     pdfio_file_t *pdf,			// I - PDF file
     const char   *s)			// I - String
 {
-  return (pdf->num_strings > 0 && bsearch(&s, pdf->strings, pdf->num_strings, sizeof(char *), (int (*)(const void *, const void *))compare_strings) != NULL);
+  int	diff;				// Difference
+
+
+  if (pdf->num_strings == 0)
+    return (false);
+
+  find_string(pdf, s, &diff);
+
+  return (diff == 0);
 }
 
 
 //
-// 'compare_strings()' - Compare two strings.
+// 'find_string()' - Find an element in the array.
 //
 
-static int				// O - Result of comparison
-compare_strings(char **a,		// I - First string
-                char **b)		// I - Second string
+static size_t				// O - Index of match
+find_string(pdfio_file_t *pdf,		// I - PDF file
+	    const char   *s,		// I - String to find
+	    int          *rdiff)	// O - Difference of match
 {
-  return (strcmp(*a, *b));
+  size_t	left,			// Left side of search
+		right,			// Right side of search
+		current;		// Current element
+  int		diff;			// Comparison with current element
+
+
+  // Do a binary search for the string...
+  left  = 0;
+  right = pdf->num_strings - 1;
+
+  do
+  {
+    current = (left + right) / 2;
+    diff    = strcmp(s, pdf->strings[current]);
+
+    if (diff == 0)
+      break;
+    else if (diff < 0)
+      right = current;
+    else
+      left = current;
+  }
+  while ((right - left) > 1);
+
+  if (diff != 0)
+  {
+    // Check the last 1 or 2 elements...
+    if ((diff = strcmp(s, pdf->strings[left])) <= 0)
+    {
+      current = left;
+    }
+    else
+    {
+      diff    = strcmp(s, pdf->strings[right]);
+      current = right;
+    }
+  }
+
+  // Return the closest string and the difference...
+  *rdiff = diff;
+
+  return (current);
 }

pdfio-token.c

@@ -1,16 +1,12 @@
 //
 // PDF token parsing functions for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
 //
 
-//
-// Include necessary headers...
-//
-
 #include "pdfio-private.h"
 
 
@@ -212,9 +208,10 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	*bufend,			// End of buffer
 	state = '\0';			// Current state
   bool	saw_nul = false;		// Did we see a nul character?
+  size_t count = 0;			// Number of whitespace/comment bytes
+
 
 
-  //
   // "state" is:
   //
   // - '\0' for idle
@@ -233,21 +230,45 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
   // Skip leading whitespace...
   while ((ch = get_char(tb)) != EOF)
   {
+    count ++;
+
     if (ch == '%')
     {
       // Skip comment
+      PDFIO_DEBUG("_pdfioTokenRead: Skipping comment...\n");
       while ((ch = get_char(tb)) != EOF)
       {
+        count ++;
+
 	if (ch == '\n' || ch == '\r')
+	{
 	  break;
+	}
+	else if (count > 2048)
+	{
+	  _pdfioFileError(tb->pdf, "Comment too long.");
+	  *bufptr = '\0';
+	  return (false);
+	}
       }
     }
     else if (!isspace(ch))
+    {
       break;
+    }
+    else if (count > 2048)
+    {
+      _pdfioFileError(tb->pdf, "Too much whitespace.");
+      *bufptr = '\0';
+      return (false);
+    }
   }
 
   if (ch == EOF)
+  {
+    *bufptr = '\0';
     return (false);
+  }
 
   // Check for delimiters...
   if (strchr(PDFIO_DELIM_CHARS, ch) != NULL)
@@ -267,6 +288,8 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
     *bufptr++ = (char)ch;
   }
 
+  PDFIO_DEBUG("_pdfioTokenRead: state='%c'\n", state);
+
   switch (state)
   {
     case '(' : // Literal string
@@ -358,6 +381,7 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	  {
 	    // Out of space
 	    _pdfioFileError(tb->pdf, "Token too large.");
+	    *bufptr = '\0';
 	    return (false);
 	  }
 	}
@@ -365,6 +389,7 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	if (ch != ')')
 	{
 	  _pdfioFileError(tb->pdf, "Unterminated string literal.");
+	  *bufptr = '\0';
 	  return (false);
 	}
 
@@ -384,6 +409,7 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
           {
 	    // Out of space...
 	    _pdfioFileError(tb->pdf, "Token too large.");
+	    *bufptr = '\0';
 	    return (false);
           }
 
@@ -417,9 +443,17 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	  {
 	    // Out of space...
 	    _pdfioFileError(tb->pdf, "Token too large.");
+	    *bufptr = '\0';
 	    return (false);
 	  }
 	}
+
+	if (ch == '\r')
+	{
+	  // Look for a trailing LF
+	  if ((ch = get_char(tb)) != EOF && ch != '\n')
+	    tb->bufptr --;
+	}
 	break;
 
     case 'N' : // number
@@ -428,6 +462,7 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	  if (!isdigit(ch) && ch != '.')
 	  {
 	    // End of number...
+	    PDFIO_DEBUG("_pdfioTokenRead: End of number with ch=0x%02x\n", ch);
 	    tb->bufptr --;
 	    break;
 	  }
@@ -440,6 +475,7 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	  {
 	    // Out of space...
 	    _pdfioFileError(tb->pdf, "Token too large.");
+	    *bufptr = '\0';
 	    return (false);
 	  }
 	}
@@ -466,12 +502,17 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	      if (!isxdigit(tch & 255))
 	      {
 		_pdfioFileError(tb->pdf, "Bad # escape in name.");
+		*bufptr = '\0';
 		return (false);
 	      }
 	      else if (isdigit(tch))
+	      {
 		ch = ((ch & 255) << 4) | (tch - '0');
+	      }
 	      else
+	      {
 		ch = ((ch & 255) << 4) | (tolower(tch) - 'a' + 10);
+	      }
 	    }
 	  }
 
@@ -483,6 +524,7 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	  {
 	    // Out of space
 	    _pdfioFileError(tb->pdf, "Token too large.");
+	    *bufptr = '\0';
 	    return (false);
 	  }
 	}
@@ -505,9 +547,12 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	else if (!isspace(ch & 255) && !isxdigit(ch & 255))
 	{
 	  _pdfioFileError(tb->pdf, "Syntax error: '<%c'", ch);
+	  *bufptr = '\0';
 	  return (false);
 	}
 
+        count = 0;
+
         do
 	{
 	  if (isxdigit(ch))
@@ -516,25 +561,39 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	    {
 	      // Hex digit
 	      *bufptr++ = (char)ch;
+	      count = 0;
 	    }
 	    else
 	    {
 	      // Too large
 	      _pdfioFileError(tb->pdf, "Token too large.");
+	      *bufptr = '\0';
 	      return (false);
 	    }
 	  }
 	  else if (!isspace(ch))
 	  {
 	    _pdfioFileError(tb->pdf, "Invalid hex string character '%c'.", ch);
+	    *bufptr = '\0';
 	    return (false);
 	  }
+	  else
+	  {
+	    count ++;
+	    if (count > 2048)
+	    {
+	      _pdfioFileError(tb->pdf, "Too much whitespace.");
+	      *bufptr = '\0';
+	      return (false);
+	    }
+	  }
 	}
 	while ((ch = get_char(tb)) != EOF && ch != '>');
 
 	if (ch == EOF)
 	{
 	  _pdfioFileError(tb->pdf, "Unterminated hex string.");
+	  *bufptr = '\0';
 	  return (false);
 	}
 	break;
@@ -547,6 +606,7 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 	else
 	{
 	  _pdfioFileError(tb->pdf, "Syntax error: '>%c'.", ch);
+	  *bufptr = '\0';
 	  return (false);
 	}
 	break;
@@ -554,7 +614,7 @@ _pdfioTokenRead(_pdfio_token_t *tb,	// I - Token buffer/stack
 
   *bufptr = '\0';
 
-//  PDFIO_DEBUG("_pdfioTokenRead: Read '%s'.\n", buffer);
+  PDFIO_DEBUG("_pdfioTokenRead: Read '%s'.\n", buffer);
 
   return (bufptr > buffer);
 }
@@ -591,7 +651,6 @@ get_char(_pdfio_token_t *tb)		// I - Token buffer
     tb->bufptr = tb->buffer;
     tb->bufend = tb->buffer + bytes;
 
-#if 0
 #ifdef DEBUG
     unsigned char *ptr;			// Pointer into buffer
 
@@ -605,7 +664,6 @@ get_char(_pdfio_token_t *tb)		// I - Token buffer
     }
     PDFIO_DEBUG("'\n");
 #endif // DEBUG
-#endif // 0
   }
 
   // Return the next character...

pdfio-value.c

@@ -1,17 +1,20 @@
 //
 // PDF value functions for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
 //
 
+#include "pdfio-private.h"
+
+
 //
-// Include necessary headers...
+// Local functions...
 //
 
-#include "pdfio-private.h"
+static time_t	get_date_time(const char *s);
 
 
 //
@@ -109,6 +112,108 @@ _pdfioValueCopy(pdfio_file_t   *pdfdst,	// I - Destination PDF file
 }
 
 
+//
+// '_pdfioValueDecrypt()' - Decrypt a value.
+//
+
+bool					// O - `true` on success, `false` on error
+_pdfioValueDecrypt(pdfio_file_t   *pdf,	// I - PDF file
+                   pdfio_obj_t    *obj,	// I - Object
+                   _pdfio_value_t *v,	// I - Value
+                   size_t         depth)// I - Depth
+{
+  _pdfio_crypto_ctx_t	ctx;		// Decryption context
+  _pdfio_crypto_cb_t	cb;		// Decryption callback
+  size_t		ivlen;		// Number of initialization vector bytes
+  uint8_t		*temp = NULL;	// Temporary buffer for decryption
+  size_t		templen;	// Number of actual data bytes
+  time_t		timeval;	// Date/time value
+
+
+  if (depth > PDFIO_MAX_DEPTH)
+  {
+    _pdfioFileError(pdf, "Value too deep.");
+    return (false);
+  }
+
+  switch (v->type)
+  {
+    default :
+        // Do nothing
+        break;
+
+    case PDFIO_VALTYPE_ARRAY :
+        return (_pdfioArrayDecrypt(pdf, obj, v->value.array, depth + 1));
+        break;
+
+    case PDFIO_VALTYPE_DICT :
+        return (_pdfioDictDecrypt(pdf, obj, v->value.dict, depth + 1));
+        break;
+
+    case PDFIO_VALTYPE_BINARY :
+	// Decrypt the binary string...
+	if (v->value.binary.datalen > PDFIO_MAX_STRING)
+	{
+	  _pdfioFileError(pdf, "Unable to read encrypted binary string - too long.");
+	  return (false);
+	}
+	else if ((temp = (uint8_t *)_pdfioStringAllocBuffer(pdf)) == NULL)
+	{
+	  _pdfioFileError(pdf, "Unable to read encrypted binary string - out of memory.");
+	  return (false);
+	}
+
+	ivlen = v->value.binary.datalen;
+	if ((cb = _pdfioCryptoMakeReader(pdf, obj, &ctx, v->value.binary.data, &ivlen)) == NULL)
+	  return (false);
+
+	templen = (cb)(&ctx, temp, v->value.binary.data + ivlen, v->value.binary.datalen - ivlen);
+
+	// Copy the decrypted string back to the value and adjust the length...
+	memcpy(v->value.binary.data, temp, templen);
+
+	if (pdf->encryption >= PDFIO_ENCRYPTION_AES_128)
+	  v->value.binary.datalen = templen - temp[templen - 1];
+	else
+	  v->value.binary.datalen = templen;
+
+        _pdfioStringFreeBuffer(pdf, (char *)temp);
+	break;
+
+    case PDFIO_VALTYPE_STRING :
+        // Decrypt regular string...
+        templen = strlen(v->value.string);
+	if (templen > (sizeof(temp) - 33))
+	{
+	  _pdfioFileError(pdf, "Unable to read encrypted string - too long.");
+	  return (false);
+	}
+
+	ivlen = templen;
+	if ((cb = _pdfioCryptoMakeReader(pdf, obj, &ctx, (uint8_t *)v->value.string, &ivlen)) == NULL)
+	  return (false);
+
+	templen = (cb)(&ctx, temp, (uint8_t *)v->value.string + ivlen, templen - ivlen);
+	temp[templen] = '\0';
+
+        if ((timeval = get_date_time((char *)temp)) != 0)
+        {
+          // Change the type to date...
+          v->type       = PDFIO_VALTYPE_DATE;
+          v->value.date = timeval;
+        }
+        else
+        {
+          // Copy the decrypted string back to the value...
+	  v->value.string = pdfioStringCreate(pdf, (char *)temp);
+	}
+        break;
+  }
+
+  return (true);
+}
+
+
 //
 // '_pdfioValueDebug()' - Print the contents of a value.
 //
@@ -117,6 +222,9 @@ void
 _pdfioValueDebug(_pdfio_value_t *v,	// I - Value
 		 FILE           *fp)	// I - Output file
 {
+  if (!v)
+    return;
+
   switch (v->type)
   {
     case PDFIO_VALTYPE_ARRAY :
@@ -199,7 +307,10 @@ _pdfioValueRead(pdfio_file_t   *pdf,	// I - PDF file
                 _pdfio_value_t *v,	// I - Value
                 size_t         depth)	// I - Depth of value
 {
-  char		token[32768];		// Token buffer
+  _pdfio_value_t *ret = NULL;		// Return value
+  char		*token = _pdfioStringAllocBuffer(pdf);
+					// Token buffer
+  time_t	timeval;		// Date/time value
 #ifdef DEBUG
   static const char * const valtypes[] =
   {
@@ -220,8 +331,11 @@ _pdfioValueRead(pdfio_file_t   *pdf,	// I - PDF file
 
   PDFIO_DEBUG("_pdfioValueRead(pdf=%p, obj=%p, v=%p)\n", pdf, obj, v);
 
-  if (!_pdfioTokenGet(tb, token, sizeof(token)))
-    return (NULL);
+  if (!token)
+    goto done;
+
+  if (!_pdfioTokenGet(tb, token, PDFIO_MAX_STRING))
+    goto done;
 
   if (!strcmp(token, "["))
   {
@@ -229,12 +343,14 @@ _pdfioValueRead(pdfio_file_t   *pdf,	// I - PDF file
     if (depth >= PDFIO_MAX_DEPTH)
     {
       _pdfioFileError(pdf, "Too many nested arrays.");
-      return (NULL);
+      goto done;
     }
 
     v->type = PDFIO_VALTYPE_ARRAY;
     if ((v->value.array = _pdfioArrayRead(pdf, obj, tb, depth + 1)) == NULL)
-      return (NULL);
+      goto done;
+
+    ret = v;
   }
   else if (!strcmp(token, "<<"))
   {
@@ -242,92 +358,34 @@ _pdfioValueRead(pdfio_file_t   *pdf,	// I - PDF file
     if (depth >= PDFIO_MAX_DEPTH)
     {
       _pdfioFileError(pdf, "Too many nested dictionaries.");
-      return (NULL);
+      goto done;
     }
 
     v->type = PDFIO_VALTYPE_DICT;
     if ((v->value.dict = _pdfioDictRead(pdf, obj, tb, depth + 1)) == NULL)
-      return (NULL);
+      goto done;
+
+    ret = v;
   }
-  else if (!strncmp(token, "(D:", 3))
+  else if ((timeval = get_date_time(token + 1)) != 0)
   {
-    // Possible date value of the form:
-    //
-    //   (D:YYYYMMDDhhmmssZ)
-    //   (D:YYYYMMDDhhmmss+HH'mm)
-    //   (D:YYYYMMDDhhmmss-HH'mm)
-    //
-    int		i;			// Looping var
-    struct tm	dateval;		// Date value
-    int		offset;			// Date offset
-
-    for (i = 3; i < 17; i ++)
-    {
-      if (!isdigit(token[i] & 255))
-        break;
-    }
-
-    if (i >= 17)
-    {
-      if (token[i] == 'Z')
-      {
-        i ++;
-      }
-      else if (token[i] == '-' || token[i] == '+')
-      {
-        if (isdigit(token[i + 1] & 255) && isdigit(token[i + 2] & 255) && token[i + 3] == '\'' && isdigit(token[i + 4] & 255) && isdigit(token[i + 5] & 255))
-        {
-          i += 6;
-          if (token[i] == '\'')
-            i ++;
-	}
-      }
-    }
-
-    if (token[i])
-    {
-      // Just a string...
-      v->type         = PDFIO_VALTYPE_STRING;
-      v->value.string = pdfioStringCreate(pdf, token + 1);
-    }
-    else
-    {
-      // Date value...
-      memset(&dateval, 0, sizeof(dateval));
-
-      dateval.tm_year = (token[3] - '0') * 1000 + (token[4] - '0') * 100 + (token[5] - '0') * 10 + token[6] - '0' - 1900;
-      dateval.tm_mon  = (token[7] - '0') * 10 + token[8] - '0' - 1;
-      dateval.tm_mday = (token[9] - '0') * 10 + token[10] - '0';
-      dateval.tm_hour = (token[11] - '0') * 10 + token[12] - '0';
-      dateval.tm_min  = (token[13] - '0') * 10 + token[14] - '0';
-      dateval.tm_sec  = (token[15] - '0') * 10 + token[16] - '0';
-
-      if (token[17] == 'Z')
-      {
-        offset = 0;
-      }
-      else
-      {
-        offset = (token[18] - '0') * 600 + (token[19] - '0') * 60 + (token[20] - '0') * 10 + token[21] - '0';
-        if (token[17] == '-')
-          offset = -offset;
-      }
-
-      v->type       = PDFIO_VALTYPE_DATE;
-      v->value.date = mktime(&dateval) + offset;
-    }
+    v->type       = PDFIO_VALTYPE_DATE;
+    v->value.date = timeval;
+    ret           = v;
   }
   else if (token[0] == '(')
   {
     // String
     v->type         = PDFIO_VALTYPE_STRING;
     v->value.string = pdfioStringCreate(pdf, token + 1);
+    ret           = v;
   }
   else if (token[0] == '/')
   {
     // Name
     v->type       = PDFIO_VALTYPE_NAME;
     v->value.name = pdfioStringCreate(pdf, token + 1);
+    ret           = v;
   }
   else if (token[0] == '<')
   {
@@ -340,7 +398,7 @@ _pdfioValueRead(pdfio_file_t   *pdf,	// I - PDF file
     if ((v->value.binary.data = (unsigned char *)malloc(v->value.binary.datalen)) == NULL)
     {
       _pdfioFileError(pdf, "Out of memory for hex string.");
-      return (NULL);
+      goto done;
     }
 
     // Convert hex to binary...
@@ -368,32 +426,7 @@ _pdfioValueRead(pdfio_file_t   *pdf,	// I - PDF file
       *dataptr++ = (unsigned char)d;
     }
 
-    if (obj && pdf->encryption)
-    {
-      // Decrypt the string...
-      _pdfio_crypto_ctx_t ctx;		// Decryption context
-      _pdfio_crypto_cb_t cb;		// Decryption callback
-      size_t	ivlen;			// Number of initialization vector bytes
-      uint8_t	temp[32768];		// Temporary buffer for decryption
-      size_t	templen;		// Number of actual data bytes
-
-      if (v->value.binary.datalen > (sizeof(temp) - 32))
-      {
-	_pdfioFileError(pdf, "Unable to read encrypted binary string - too long.");
-	return (false);
-      }
-
-      cb      = _pdfioCryptoMakeReader(pdf, obj, &ctx, v->value.binary.data, &ivlen);
-      templen = (cb)(&ctx, temp, v->value.binary.data + ivlen, v->value.binary.datalen - ivlen);
-
-      // Copy the decrypted string back to the value and adjust the length...
-      memcpy(v->value.binary.data, temp, templen);
-
-      if (pdf->encryption >= PDFIO_ENCRYPTION_AES_128)
-        v->value.binary.datalen = templen - temp[templen - 1];
-      else
-	v->value.binary.datalen = templen;
-    }
+    ret = v;
   }
   else if (strchr("0123456789-+.", token[0]) != NULL)
   {
@@ -481,35 +514,50 @@ _pdfioValueRead(pdfio_file_t   *pdf,	// I - PDF file
 
 	  PDFIO_DEBUG("_pdfioValueRead: Returning indirect value %lu %u R.\n", (unsigned long)v->value.indirect.number, v->value.indirect.generation);
 
-	  return (v);
+	  ret = v;
+	  goto done;
 	}
       }
     }
 
     // If we get here, we have a number...
     v->type         = PDFIO_VALTYPE_NUMBER;
-    v->value.number = (double)strtod(token, NULL);
+    v->value.number = _pdfio_strtod(pdf, token);
+    ret             = v;
   }
   else if (!strcmp(token, "true") || !strcmp(token, "false"))
   {
     // Boolean value
     v->type          = PDFIO_VALTYPE_BOOLEAN;
     v->value.boolean = !strcmp(token, "true");
+    ret              = v;
   }
   else if (!strcmp(token, "null"))
   {
     // null value
     v->type = PDFIO_VALTYPE_NULL;
+    ret     = v;
   }
   else
   {
     _pdfioFileError(pdf, "Unexpected '%s' token seen.", token);
-    return (NULL);
   }
 
-  PDFIO_DEBUG("_pdfioValueRead: Returning %s value.\n", valtypes[v->type]);
+  done:
 
-  return (v);
+  if (token)
+    _pdfioStringFreeBuffer(pdf, token);
+
+  if (ret)
+  {
+    PDFIO_DEBUG("_pdfioValueRead: Returning %s value.\n", valtypes[ret->type]);
+    return (ret);
+  }
+  else
+  {
+    PDFIO_DEBUG("_pdfioValueRead: Returning NULL.\n");
+    return (NULL);
+  }
 }
 
 
@@ -534,8 +582,10 @@ _pdfioValueWrite(pdfio_file_t   *pdf,	// I - PDF file
     case PDFIO_VALTYPE_BINARY :
         {
           size_t	databytes;	// Bytes to write
-          uint8_t	temp[32768],	// Temporary buffer for encryption
+          uint8_t	*temp = NULL,	// Temporary buffer for encryption
 			*dataptr;	// Pointer into data
+          bool          ret = false;	// Return value
+
 
           if (obj && pdf->encryption)
           {
@@ -544,11 +594,16 @@ _pdfioValueWrite(pdfio_file_t   *pdf,	// I - PDF file
 	    _pdfio_crypto_cb_t cb;	// Encryption callback
 	    size_t	ivlen;		// Number of initialization vector bytes
 
-            if (v->value.binary.datalen > (sizeof(temp) - 32))
+            if (v->value.binary.datalen > PDFIO_MAX_STRING)
             {
 	      _pdfioFileError(pdf, "Unable to write encrypted binary string - too long.");
 	      return (false);
             }
+            else if ((temp = (uint8_t *)_pdfioStringAllocBuffer(pdf)) == NULL)
+            {
+	      _pdfioFileError(pdf, "Unable to write encrypted binary string - out of memory.");
+	      return (false);
+            }
 
 	    cb        = _pdfioCryptoMakeWriter(pdf, obj, &ctx, temp, &ivlen);
 	    databytes = (cb)(&ctx, temp + ivlen, v->value.binary.data, v->value.binary.datalen) + ivlen;
@@ -561,18 +616,25 @@ _pdfioValueWrite(pdfio_file_t   *pdf,	// I - PDF file
           }
 
           if (!_pdfioFilePuts(pdf, "<"))
-            return (false);
+            goto bindone;
 
           for (; databytes > 1; databytes -= 2, dataptr += 2)
           {
             if (!_pdfioFilePrintf(pdf, "%02X%02X", dataptr[0], dataptr[1]))
-              return (false);
+              goto bindone;
           }
 
-          if (databytes > 0)
-            return (_pdfioFilePrintf(pdf, "%02X>", dataptr[0]));
-          else
-            return (_pdfioFilePuts(pdf, ">"));
+          if (databytes > 0 && !_pdfioFilePrintf(pdf, "%02X", dataptr[0]))
+            goto bindone;
+
+	  ret = _pdfioFilePuts(pdf, ">");
+
+          bindone:
+
+          if (temp)
+            _pdfioStringFreeBuffer(pdf, (char *)temp);
+
+          return (ret);
         }
 
     case PDFIO_VALTYPE_BOOLEAN :
@@ -597,7 +659,7 @@ _pdfioValueWrite(pdfio_file_t   *pdf,	// I - PDF file
 	  if (obj && pdf->encryption)
 	  {
 	    // Write encrypted string...
-	    uint8_t	temp[32768],	// Encrypted bytes
+	    uint8_t	temp[64],	// Encrypted bytes
 			*tempptr;	// Pointer into encrypted bytes
 	    _pdfio_crypto_ctx_t ctx;	// Encryption context
 	    _pdfio_crypto_cb_t cb;	// Encryption callback
@@ -625,7 +687,7 @@ _pdfioValueWrite(pdfio_file_t   *pdf,	// I - PDF file
 	  }
 	  else
 	  {
-	    return (_pdfioFilePrintf(pdf, "(%s)", datestr));
+	    return (_pdfioFilePrintf(pdf, "%S", datestr));
 	  }
         }
 
@@ -636,19 +698,19 @@ _pdfioValueWrite(pdfio_file_t   *pdf,	// I - PDF file
         return (_pdfioFilePrintf(pdf, " %lu %u R", (unsigned long)v->value.indirect.number, v->value.indirect.generation));
 
     case PDFIO_VALTYPE_NAME :
-        return (_pdfioFilePrintf(pdf, "/%s", v->value.name));
+        return (_pdfioFilePrintf(pdf, "%N", v->value.name));
 
     case PDFIO_VALTYPE_NULL :
         return (_pdfioFilePuts(pdf, " null"));
 
     case PDFIO_VALTYPE_NUMBER :
-        return (_pdfioFilePrintf(pdf, " %g", v->value.number));
+        return (_pdfioFilePrintf(pdf, " %.6f", v->value.number));
 
     case PDFIO_VALTYPE_STRING :
         if (obj && pdf->encryption)
         {
           // Write encrypted string...
-          uint8_t	temp[32768],	// Encrypted bytes
+          uint8_t	*temp = NULL,	// Encrypted bytes
 			*tempptr;	// Pointer into encrypted bytes
           _pdfio_crypto_ctx_t ctx;	// Encryption context
           _pdfio_crypto_cb_t cb;	// Encryption callback
@@ -656,76 +718,162 @@ _pdfioValueWrite(pdfio_file_t   *pdf,	// I - PDF file
 					// Length of value
 			ivlen,		// Number of initialization vector bytes
 			tempbytes;	// Number of output bytes
+	  bool		ret = false;	// Return value
 
-          if (len > (sizeof(temp) - 32))
+          if (len > PDFIO_MAX_STRING)
           {
             _pdfioFileError(pdf, "Unable to write encrypted string - too long.");
             return (false);
           }
+          else if ((temp = (uint8_t *)_pdfioStringAllocBuffer(pdf)) == NULL)
+          {
+            _pdfioFileError(pdf, "Unable to write encrypted string - out of memory.");
+            return (false);
+          }
 
           cb        = _pdfioCryptoMakeWriter(pdf, obj, &ctx, temp, &ivlen);
           tempbytes = (cb)(&ctx, temp + ivlen, (const uint8_t *)v->value.string, len) + ivlen;
 
           if (!_pdfioFilePuts(pdf, "<"))
-            return (false);
+            goto strdone;
 
           for (tempptr = temp; tempbytes > 1; tempbytes -= 2, tempptr += 2)
           {
             if (!_pdfioFilePrintf(pdf, "%02X%02X", tempptr[0], tempptr[1]))
-              return (false);
+              goto strdone;
           }
 
-          if (tempbytes > 0)
-            return (_pdfioFilePrintf(pdf, "%02X>", *tempptr));
-          else
-	    return (_pdfioFilePuts(pdf, ">"));
+          if (tempbytes > 0 && !_pdfioFilePrintf(pdf, "%02X", *tempptr))
+            goto strdone;
+
+	  ret = _pdfioFilePuts(pdf, ">");
+
+          strdone :
+
+          _pdfioStringFreeBuffer(pdf, (char *)temp);
+
+          return (ret);
         }
         else
         {
           // Write unencrypted string...
-          const char *start,		// Start of fragment
-		     *end;		// End of fragment
-
-          if (!_pdfioFilePuts(pdf, "("))
-            return (false);
-
-          // Write a quoted string value...
-          for (start = v->value.string; *start; start = end)
-          {
-            // Find the next character that needs to be quoted...
-            for (end = start; *end; end ++)
-            {
-              if (*end == '\\' || *end == ')' || (*end & 255) < ' ')
-                break;
-            }
-
-            if (end > start)
-            {
-              // Write unquoted (safe) characters...
-	      if (!_pdfioFileWrite(pdf, start, (size_t)(end - start)))
-		return (false);
-	    }
-
-            if (*end)
-            {
-              // Quote this character...
-              bool success;		// Did the write work?
-
-              if (*end == '\\' || *end == ')')
-                success = _pdfioFilePrintf(pdf, "\\%c", *end);
-              else
-                success = _pdfioFilePrintf(pdf, "\\%03o", *end);
-
-              if (!success)
-                return (false);
-
-              end ++;
-            }
-          }
-
-          return (_pdfioFilePuts(pdf, ")"));
+          return (_pdfioFilePrintf(pdf, "%S", v->value.string));
         }
   }
 
   return (false);
 }
+
+
+//
+// 'get_date_time()' - Convert PDF date/time value to time_t.
+//
+
+static time_t				// O - Time in seconds or `0` for none
+get_date_time(const char *s)		// I - PDF date/time value
+{
+  int		i;			// Looping var
+  struct tm	dateval;		// Date value
+  int		offset = 0;		// Date offset in seconds
+  time_t	t;			// Time value
+
+
+  PDFIO_DEBUG("get_date_time(s=\"%s\")\n", s);
+
+  // Possible date value of the form:
+  //
+  //   D:YYYYMMDDhhmmssZ
+  //   D:YYYYMMDDhhmmss+HH'mm
+  //   D:YYYYMMDDhhmmss-HH'mm
+  //
+
+  if (strncmp(s, "D:", 2))
+    return (0);
+
+  for (i = 2; i < 16; i ++)
+  {
+    // Look for date/time digits...
+    if (!isdigit(s[i] & 255) || !s[i])
+      break;
+  }
+
+  if (i < 6 || (i & 1))
+  {
+    // Short year or missing digit...
+    return (0);
+  }
+
+  memset(&dateval, 0, sizeof(dateval));
+
+  dateval.tm_year = (s[2] - '0') * 1000 + (s[3] - '0') * 100 + (s[4] - '0') * 10 + s[5] - '0' - 1900;
+  if (i > 6)
+    dateval.tm_mon  = (s[6] - '0') * 10 + s[7] - '0' - 1;
+  if (i > 8)
+    dateval.tm_mday = (s[8] - '0') * 10 + s[9] - '0';
+  else
+    dateval.tm_mday = 1;
+  if (i > 10)
+    dateval.tm_hour = (s[10] - '0') * 10 + s[11] - '0';
+  if (i > 12)
+    dateval.tm_min  = (s[12] - '0') * 10 + s[13] - '0';
+  if (i > 14)
+    dateval.tm_sec  = (s[14] - '0') * 10 + s[15] - '0';
+
+  if (i >= 16 && s[i])
+  {
+    // Get zone info...
+    if (s[i] == 'Z')
+    {
+      // UTC...
+      i ++;
+    }
+    else if (s[i] == '-' || s[i] == '+')
+    {
+      // Timezone offset from UTC...
+      if (isdigit(s[i + 1] & 255) && isdigit(s[i + 2] & 255) && s[i + 3] == '\'' && isdigit(s[i + 4] & 255) && isdigit(s[i + 5] & 255))
+      {
+	offset = (s[i + 1] - '0') * 36000 + (s[i + 2] - '0') * 3600 + (s[i + 4] - '0') * 600 + (s[i + 5] - '0') * 60;
+	if (s[i] == '-')
+	  offset = -offset;
+
+	i += 6;
+
+	// Accept trailing quote, per PDF spec...
+	if (s[i] == '\'')
+	  i ++;
+      }
+    }
+    else
+    {
+      // Random zone info, invalid date string...
+      return (0);
+    }
+  }
+
+  if (s[i])
+  {
+    // Just a string...
+    return (0);
+  }
+
+  // Convert date value to time_t...
+#if _WIN32
+  if ((t = _mkgmtime(&dateval)) < 0)
+    return (0);
+#elif defined(HAVE_TIMEGM)
+  if ((t = timegm(&dateval)) < 0)
+    return (0);
+#else
+  if ((t = mktime(&dateval)) < 0)
+    return (0);
+
+#  if defined(HAVE_TM_GMTOFF)
+  localtime_r(&t, &dateval);
+  t -= dateval.tm_gmtoff;
+#  else
+  t -= timezone;
+#  endif // HAVE_TM_GMTOFF
+#endif // _WIN32
+
+  return (t + offset);
+}

pdfio.h

@@ -1,7 +1,7 @@
 //
 // Public header file for PDFio.
 //
-// Copyright © 2021-2023 by Michael R Sweet.
+// Copyright © 2021-2025 by Michael R Sweet.
 //
 // Licensed under Apache License v2.0.  See the file "LICENSE" for more
 // information.
@@ -20,10 +20,12 @@ extern "C" {
 
 
 //
-// Version number...
+// Version numbers...
 //
 
-#  define PDFIO_VERSION		"1.1.3"
+#  define PDFIO_VERSION		"1.5.2"
+#  define PDFIO_VERSION_MAJOR	1
+#  define PDFIO_VERSION_MINOR	5
 
 
 //
@@ -32,10 +34,10 @@ extern "C" {
 
 #  if defined(__has_extension) || defined(__GNUC__)
 #    define _PDFIO_PUBLIC	__attribute__ ((visibility("default")))
-#    define _PDFIO_FORMAT(a,b)	__attribute__ ((__format__(__printf__, a,b)))
+#    define _PDFIO_DEPRECATED	__attribute__ ((deprecated)) _PDFIO_PUBLIC
 #  else
 #    define _PDFIO_PUBLIC
-#    define _PDFIO_FORMAT(a,b)
+#    define _PDFIO_DEPRECATED
 #  endif // __has_extension || __GNUC__
 
 
@@ -63,7 +65,7 @@ typedef enum pdfio_encryption_e		// PDF encryption modes
   PDFIO_ENCRYPTION_RC4_40,		// 40-bit RC4 encryption (PDF 1.3)
   PDFIO_ENCRYPTION_RC4_128,		// 128-bit RC4 encryption (PDF 1.4)
   PDFIO_ENCRYPTION_AES_128,		// 128-bit AES encryption (PDF 1.6)
-  PDFIO_ENCRYPTION_AES_256		// 256-bit AES encryption (PDF 2.0)
+  PDFIO_ENCRYPTION_AES_256		// 256-bit AES encryption (PDF 2.0) @exclude all@
 } pdfio_encryption_t;
 typedef enum pdfio_filter_e		// Compression/decompression filters for streams
 {
@@ -149,7 +151,9 @@ extern pdfio_obj_t	*pdfioArrayGetObj(pdfio_array_t *a, size_t n) _PDFIO_PUBLIC;
 extern size_t		pdfioArrayGetSize(pdfio_array_t *a) _PDFIO_PUBLIC;
 extern const char	*pdfioArrayGetString(pdfio_array_t *a, size_t n) _PDFIO_PUBLIC;
 extern pdfio_valtype_t	pdfioArrayGetType(pdfio_array_t *a, size_t n) _PDFIO_PUBLIC;
+extern bool		pdfioArrayRemove(pdfio_array_t *a, size_t n) _PDFIO_PUBLIC;
 
+extern bool		pdfioDictClear(pdfio_dict_t *dict, const char *key) _PDFIO_PUBLIC;
 extern pdfio_dict_t	*pdfioDictCopy(pdfio_file_t *pdf, pdfio_dict_t *dict) _PDFIO_PUBLIC;
 extern pdfio_dict_t	*pdfioDictCreate(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern pdfio_array_t	*pdfioDictGetArray(pdfio_dict_t *dict, const char *key) _PDFIO_PUBLIC;
@@ -157,7 +161,9 @@ extern unsigned char	*pdfioDictGetBinary(pdfio_dict_t *dict, const char *key, si
 extern bool		pdfioDictGetBoolean(pdfio_dict_t *dict, const char *key) _PDFIO_PUBLIC;
 extern time_t		pdfioDictGetDate(pdfio_dict_t *dict, const char *key) _PDFIO_PUBLIC;
 extern pdfio_dict_t	*pdfioDictGetDict(pdfio_dict_t *dict, const char *key) _PDFIO_PUBLIC;
+extern const char	*pdfioDictGetKey(pdfio_dict_t *dict, size_t n) _PDFIO_PUBLIC;
 extern const char	*pdfioDictGetName(pdfio_dict_t *dict, const char *key) _PDFIO_PUBLIC;
+extern size_t		pdfioDictGetNumPairs(pdfio_dict_t *dict) _PDFIO_PUBLIC;
 extern double		pdfioDictGetNumber(pdfio_dict_t *dict, const char *key) _PDFIO_PUBLIC;
 extern pdfio_obj_t	*pdfioDictGetObj(pdfio_dict_t *dict, const char *key) _PDFIO_PUBLIC;
 extern pdfio_rect_t	*pdfioDictGetRect(pdfio_dict_t *dict, const char *key, pdfio_rect_t *rect) _PDFIO_PUBLIC;
@@ -175,22 +181,27 @@ extern bool		pdfioDictSetNumber(pdfio_dict_t *dict, const char *key, double valu
 extern bool		pdfioDictSetObj(pdfio_dict_t *dict, const char *key, pdfio_obj_t *value) _PDFIO_PUBLIC;
 extern bool		pdfioDictSetRect(pdfio_dict_t *dict, const char *key, pdfio_rect_t *value) _PDFIO_PUBLIC;
 extern bool		pdfioDictSetString(pdfio_dict_t *dict, const char *key, const char *value) _PDFIO_PUBLIC;
-extern bool		pdfioDictSetStringf(pdfio_dict_t *dict, const char *key, const char *format, ...) _PDFIO_PUBLIC _PDFIO_FORMAT(3,4);
+extern bool		pdfioDictSetStringf(pdfio_dict_t *dict, const char *key, const char *format, ...) _PDFIO_PUBLIC;
 
 extern bool		pdfioFileClose(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern pdfio_file_t	*pdfioFileCreate(const char *filename, const char *version, pdfio_rect_t *media_box, pdfio_rect_t *crop_box, pdfio_error_cb_t error_cb, void *error_data) _PDFIO_PUBLIC;
 extern pdfio_obj_t	*pdfioFileCreateArrayObj(pdfio_file_t *pdf, pdfio_array_t *array) _PDFIO_PUBLIC;
+extern pdfio_obj_t	*pdfioFileCreateNameObj(pdfio_file_t *pdf, const char *name) _PDFIO_PUBLIC;
+extern pdfio_obj_t	*pdfioFileCreateNumberObj(pdfio_file_t *pdf, double number) _PDFIO_PUBLIC;
 extern pdfio_obj_t	*pdfioFileCreateObj(pdfio_file_t *pdf, pdfio_dict_t *dict) _PDFIO_PUBLIC;
 extern pdfio_file_t	*pdfioFileCreateOutput(pdfio_output_cb_t output_cb, void *output_ctx, const char *version, pdfio_rect_t *media_box, pdfio_rect_t *crop_box, pdfio_error_cb_t error_cb, void *error_data) _PDFIO_PUBLIC;
 // TODO: Add number, array, string, etc. versions of pdfioFileCreateObject?
 extern pdfio_stream_t	*pdfioFileCreatePage(pdfio_file_t *pdf, pdfio_dict_t *dict) _PDFIO_PUBLIC;
+extern pdfio_obj_t	*pdfioFileCreateStringObj(pdfio_file_t *pdf, const char *s) _PDFIO_PUBLIC;
 extern pdfio_file_t	*pdfioFileCreateTemporary(char *buffer, size_t bufsize, const char *version, pdfio_rect_t *media_box, pdfio_rect_t *crop_box, pdfio_error_cb_t error_cb, void *error_data) _PDFIO_PUBLIC;
 extern pdfio_obj_t	*pdfioFileFindObj(pdfio_file_t *pdf, size_t number) _PDFIO_PUBLIC;
 extern const char	*pdfioFileGetAuthor(pdfio_file_t *pdf) _PDFIO_PUBLIC;
+extern pdfio_dict_t	*pdfioFileGetCatalog(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern time_t		pdfioFileGetCreationDate(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern const char	*pdfioFileGetCreator(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern pdfio_array_t	*pdfioFileGetID(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern const char	*pdfioFileGetKeywords(pdfio_file_t *pdf) _PDFIO_PUBLIC;
+extern time_t		pdfioFileGetModificationDate(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern const char	*pdfioFileGetName(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern size_t		pdfioFileGetNumObjs(pdfio_file_t *pdf) _PDFIO_PUBLIC;
 extern size_t		pdfioFileGetNumPages(pdfio_file_t *pdf) _PDFIO_PUBLIC;
@@ -206,6 +217,7 @@ extern void		pdfioFileSetAuthor(pdfio_file_t *pdf, const char *value) _PDFIO_PUB
 extern void		pdfioFileSetCreationDate(pdfio_file_t *pdf, time_t value) _PDFIO_PUBLIC;
 extern void		pdfioFileSetCreator(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
 extern void		pdfioFileSetKeywords(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
+extern void		pdfioFileSetModificationDate(pdfio_file_t *pdf, time_t value) _PDFIO_PUBLIC;
 extern bool		pdfioFileSetPermissions(pdfio_file_t *pdf, pdfio_permission_t permissions, pdfio_encryption_t encryption, const char *owner_password, const char *user_password) _PDFIO_PUBLIC;
 extern void		pdfioFileSetSubject(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
 extern void		pdfioFileSetTitle(pdfio_file_t *pdf, const char *value) _PDFIO_PUBLIC;
@@ -217,6 +229,7 @@ extern pdfio_array_t	*pdfioObjGetArray(pdfio_obj_t *obj) _PDFIO_PUBLIC;
 extern pdfio_dict_t	*pdfioObjGetDict(pdfio_obj_t *obj) _PDFIO_PUBLIC;
 extern unsigned short	pdfioObjGetGeneration(pdfio_obj_t *obj) _PDFIO_PUBLIC;
 extern size_t		pdfioObjGetLength(pdfio_obj_t *obj) _PDFIO_PUBLIC;
+extern const char	*pdfioObjGetName(pdfio_obj_t *obj) _PDFIO_PUBLIC;
 extern size_t		pdfioObjGetNumber(pdfio_obj_t *obj) _PDFIO_PUBLIC;
 extern const char	*pdfioObjGetSubtype(pdfio_obj_t *obj) _PDFIO_PUBLIC;
 extern const char	*pdfioObjGetType(pdfio_obj_t *obj) _PDFIO_PUBLIC;
@@ -230,14 +243,14 @@ extern bool		pdfioStreamClose(pdfio_stream_t *st) _PDFIO_PUBLIC;
 extern bool		pdfioStreamConsume(pdfio_stream_t *st, size_t bytes) _PDFIO_PUBLIC;
 extern bool		pdfioStreamGetToken(pdfio_stream_t *st, char *buffer, size_t bufsize) _PDFIO_PUBLIC;
 extern ssize_t		pdfioStreamPeek(pdfio_stream_t *st, void *buffer, size_t bytes) _PDFIO_PUBLIC;
-extern bool		pdfioStreamPrintf(pdfio_stream_t *st, const char *format, ...) _PDFIO_PUBLIC _PDFIO_FORMAT(2,3);
+extern bool		pdfioStreamPrintf(pdfio_stream_t *st, const char *format, ...) _PDFIO_PUBLIC;
 extern bool		pdfioStreamPutChar(pdfio_stream_t *st, int ch) _PDFIO_PUBLIC;
 extern bool		pdfioStreamPuts(pdfio_stream_t *st, const char *s) _PDFIO_PUBLIC;
 extern ssize_t		pdfioStreamRead(pdfio_stream_t *st, void *buffer, size_t bytes) _PDFIO_PUBLIC;
 extern bool		pdfioStreamWrite(pdfio_stream_t *st, const void *buffer, size_t bytes) _PDFIO_PUBLIC;
 
 extern char		*pdfioStringCreate(pdfio_file_t *pdf, const char *s)  _PDFIO_PUBLIC;
-extern char		*pdfioStringCreatef(pdfio_file_t *pdf, const char *format, ...) _PDFIO_FORMAT(2,3) _PDFIO_PUBLIC;
+extern char		*pdfioStringCreatef(pdfio_file_t *pdf, const char *format, ...)  _PDFIO_PUBLIC;
 
 
 #  ifdef __cplusplus

pdfio.pc.in

@@ -1,6 +1,13 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
 Name: pdfio
 Description: PDF read/write library
+Version: @PDFIO_VERSION@
 URL: https://www.msweet.org/pdfio
-Requires: zlib >= 1.0
-Libs: -L${prefix}/lib -lpdfio -lm
-Cflags: -I${prefix}/include
+Cflags: @PKGCONFIG_CFLAGS@
+Libs: @PKGCONFIG_LIBS@
+Libs.private: @PKGCONFIG_LIBS_PRIVATE@
+Requires: @PKGCONFIG_REQUIRES@

pdfio.vcxproj

@@ -115,7 +115,7 @@
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>HAVE_LIBPNG;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
     </ClCompile>
     <Link>
@@ -130,7 +130,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>HAVE_LIBPNG;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
     </ClCompile>
     <Link>
@@ -172,6 +172,8 @@
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
+    <Import Project="packages\libpng_native.redist.1.6.30\build\native\libpng_native.redist.targets" Condition="Exists('packages\libpng_native.redist.1.6.30\build\native\libpng_native.redist.targets')" />
+    <Import Project="packages\libpng_native.1.6.30\build\native\libpng_native.targets" Condition="Exists('packages\libpng_native.1.6.30\build\native\libpng_native.targets')" />
     <Import Project="packages\zlib_native.redist.1.2.11\build\native\zlib_native.redist.targets" Condition="Exists('packages\zlib_native.redist.1.2.11\build\native\zlib_native.redist.targets')" />
     <Import Project="packages\zlib_native.1.2.11\build\native\zlib_native.targets" Condition="Exists('packages\zlib_native.1.2.11\build\native\zlib_native.targets')" />
   </ImportGroup>

pdfio.xcodeproj/project.pbxproj

@@ -3,7 +3,7 @@
 	archiveVersion = 1;
 	classes = {
 	};
-	objectVersion = 50;
+	objectVersion = 54;
 	objects = {
 
 /* Begin PBXBuildFile section */
@@ -31,6 +31,7 @@
 		27F2F0612710BE92008ECD36 /* pdfio-rc4.c in Sources */ = {isa = PBXBuildFile; fileRef = 27F2F05E2710BE92008ECD36 /* pdfio-rc4.c */; };
 		27F2F0622710BE92008ECD36 /* pdfio-crypto.c in Sources */ = {isa = PBXBuildFile; fileRef = 27F2F05F2710BE92008ECD36 /* pdfio-crypto.c */; };
 		27F2F0642711243D008ECD36 /* pdfio-sha256.c in Sources */ = {isa = PBXBuildFile; fileRef = 27F2F0632711243D008ECD36 /* pdfio-sha256.c */; };
+		27FCBDE42D19F9B300485EEE /* pdfio-base-font-widths.h in Headers */ = {isa = PBXBuildFile; fileRef = 27FCBDE32D19F9B300485EEE /* pdfio-base-font-widths.h */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -89,6 +90,7 @@
 		27F2F05E2710BE92008ECD36 /* pdfio-rc4.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = "pdfio-rc4.c"; sourceTree = "<group>"; };
 		27F2F05F2710BE92008ECD36 /* pdfio-crypto.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = "pdfio-crypto.c"; sourceTree = "<group>"; };
 		27F2F0632711243D008ECD36 /* pdfio-sha256.c */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.c; path = "pdfio-sha256.c"; sourceTree = "<group>"; };
+		27FCBDE32D19F9B300485EEE /* pdfio-base-font-widths.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "pdfio-base-font-widths.h"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -162,6 +164,7 @@
 			children = (
 				27CF90432711DFFE00E50FE4 /* pdfio-aes.c */,
 				273440BA263D727800FBFD63 /* pdfio-array.c */,
+				27FCBDE32D19F9B300485EEE /* pdfio-base-font-widths.h */,
 				273440BB263D727800FBFD63 /* pdfio-common.c */,
 				271EA703265B2B1000ACDD39 /* pdfio-content.c */,
 				27F2F05F2710BE92008ECD36 /* pdfio-crypto.c */,
@@ -205,6 +208,7 @@
 			isa = PBXHeadersBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				27FCBDE42D19F9B300485EEE /* pdfio-base-font-widths.h in Headers */,
 				273440CC263D727800FBFD63 /* pdfio.h in Headers */,
 				271EA706265B2B1000ACDD39 /* pdfio-content.h in Headers */,
 				273440C3263D727800FBFD63 /* pdfio-private.h in Headers */,
@@ -256,7 +260,8 @@
 		273440A8263D6FE200FBFD63 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 1300;
+				BuildIndependentTargetsInParallel = YES;
+				LastUpgradeCheck = 1600;
 				TargetAttributes = {
 					273440AF263D6FE200FBFD63 = {
 						CreatedOnToolsVersion = 12.5;
@@ -373,9 +378,11 @@
 				CODE_SIGN_IDENTITY = "Apple Development";
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1.1.2;
+				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_PREPROCESSOR_DEFINITIONS = (
@@ -450,15 +457,15 @@
 				CODE_SIGN_IDENTITY = "Apple Development";
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1.1.2;
+				DEAD_CODE_STRIPPING = YES;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_HARDENED_RUNTIME = YES;
 				ENABLE_NS_ASSERTIONS = NO;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu11;
 				GCC_NO_COMMON_BLOCKS = YES;
-				GCC_PREPROCESSOR_DEFINITIONS = (
-					"$(inherited)",
-				);
+				GCC_PREPROCESSOR_DEFINITIONS = "$(inherited)";
 				GCC_TREAT_IMPLICIT_FUNCTION_DECLARATIONS_AS_ERRORS = YES;
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES;
@@ -486,6 +493,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
+				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = RU58A2256H;
 				EXECUTABLE_PREFIX = lib;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -497,6 +505,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CODE_SIGN_STYLE = Automatic;
+				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = RU58A2256H;
 				EXECUTABLE_PREFIX = lib;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -509,6 +518,7 @@
 			buildSettings = {
 				CODE_SIGN_IDENTITY = "-";
 				CODE_SIGN_STYLE = Automatic;
+				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = "";
 				ENABLE_HARDENED_RUNTIME = YES;
 				GCC_DYNAMIC_NO_PIC = NO;
@@ -525,6 +535,7 @@
 			buildSettings = {
 				CODE_SIGN_IDENTITY = "-";
 				CODE_SIGN_STYLE = Automatic;
+				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = "";
 				ENABLE_HARDENED_RUNTIME = YES;
 				MACOSX_DEPLOYMENT_TARGET = 11.0;

pdfio1.def

@@ -1,67 +1,20 @@
 LIBRARY pdfio1
-VERSION 1.0
+VERSION 1.5
 EXPORTS
-_pdfioArrayDebug
-_pdfioArrayDelete
-_pdfioArrayGetValue
-_pdfioArrayRead
-_pdfioArrayWrite
 _pdfioCryptoAESDecrypt
 _pdfioCryptoAESEncrypt
 _pdfioCryptoAESInit
-_pdfioCryptoLock
 _pdfioCryptoMD5Append
 _pdfioCryptoMD5Finish
 _pdfioCryptoMD5Init
-_pdfioCryptoMakeRandom
-_pdfioCryptoMakeReader
-_pdfioCryptoMakeWriter
 _pdfioCryptoRC4Crypt
 _pdfioCryptoRC4Init
 _pdfioCryptoSHA256Append
 _pdfioCryptoSHA256Finish
 _pdfioCryptoSHA256Init
-_pdfioCryptoUnlock
-_pdfioDictClear
-_pdfioDictDebug
-_pdfioDictDelete
-_pdfioDictGetValue
-_pdfioDictRead
-_pdfioDictSetValue
-_pdfioDictWrite
-_pdfioFileAddMappedObj
-_pdfioFileAddPage
-_pdfioFileConsume
-_pdfioFileCreateObj
-_pdfioFileDefaultError
-_pdfioFileError
-_pdfioFileFindMappedObj
-_pdfioFileFlush
-_pdfioFileGetChar
-_pdfioFileGets
-_pdfioFilePeek
-_pdfioFilePrintf
-_pdfioFilePuts
-_pdfioFileRead
-_pdfioFileSeek
-_pdfioFileTell
-_pdfioFileWrite
-_pdfioObjDelete
-_pdfioObjLoad
-_pdfioStreamCreate
-_pdfioStreamOpen
-_pdfioStringIsAllocated
-_pdfioTokenClear
-_pdfioTokenFlush
-_pdfioTokenGet
 _pdfioTokenInit
-_pdfioTokenPush
-_pdfioTokenRead
-_pdfioValueCopy
 _pdfioValueDebug
-_pdfioValueDelete
 _pdfioValueRead
-_pdfioValueWrite
 pdfioArrayAppendArray
 pdfioArrayAppendBinary
 pdfioArrayAppendBoolean
@@ -89,6 +42,7 @@ pdfioArrayGetObj
 pdfioArrayGetSize
 pdfioArrayGetString
 pdfioArrayGetType
+pdfioArrayRemove
 pdfioContentClip
 pdfioContentDrawImage
 pdfioContentFill
@@ -136,12 +90,17 @@ pdfioContentSetTextXScaling
 pdfioContentStroke
 pdfioContentTextBegin
 pdfioContentTextEnd
+pdfioContentTextMeasure
 pdfioContentTextMoveLine
 pdfioContentTextMoveTo
+pdfioContentTextNewLine
+pdfioContentTextNewLineShow
+pdfioContentTextNewLineShowf
 pdfioContentTextNextLine
 pdfioContentTextShow
 pdfioContentTextShowJustified
 pdfioContentTextShowf
+pdfioDictClear
 pdfioDictCopy
 pdfioDictCreate
 pdfioDictGetArray
@@ -149,7 +108,9 @@ pdfioDictGetBinary
 pdfioDictGetBoolean
 pdfioDictGetDate
 pdfioDictGetDict
+pdfioDictGetKey
 pdfioDictGetName
+pdfioDictGetNumPairs
 pdfioDictGetNumber
 pdfioDictGetObj
 pdfioDictGetRect
@@ -173,19 +134,25 @@ pdfioFileCreate
 pdfioFileCreateArrayObj
 pdfioFileCreateFontObjFromBase
 pdfioFileCreateFontObjFromFile
+pdfioFileCreateICCObjFromData
 pdfioFileCreateICCObjFromFile
 pdfioFileCreateImageObjFromData
 pdfioFileCreateImageObjFromFile
+pdfioFileCreateNameObj
+pdfioFileCreateNumberObj
 pdfioFileCreateObj
 pdfioFileCreateOutput
 pdfioFileCreatePage
+pdfioFileCreateStringObj
 pdfioFileCreateTemporary
 pdfioFileFindObj
 pdfioFileGetAuthor
+pdfioFileGetCatalog
 pdfioFileGetCreationDate
 pdfioFileGetCreator
 pdfioFileGetID
 pdfioFileGetKeywords
+pdfioFileGetModificationDate
 pdfioFileGetName
 pdfioFileGetNumObjs
 pdfioFileGetNumPages
@@ -201,6 +168,7 @@ pdfioFileSetAuthor
 pdfioFileSetCreationDate
 pdfioFileSetCreator
 pdfioFileSetKeywords
+pdfioFileSetModificationDate
 pdfioFileSetPermissions
 pdfioFileSetSubject
 pdfioFileSetTitle
@@ -214,6 +182,7 @@ pdfioObjGetArray
 pdfioObjGetDict
 pdfioObjGetGeneration
 pdfioObjGetLength
+pdfioObjGetName
 pdfioObjGetNumber
 pdfioObjGetSubtype
 pdfioObjGetType

pdfio_native.nuspec

@@ -3,7 +3,7 @@
     <metadata>
         <id>pdfio_native</id>
         <title>PDFio Library for VS2019+</title>
-        <version>1.1.3</version>
+        <version>1.5.1</version>
         <authors>Michael R Sweet</authors>
         <owners>michaelrsweet</owners>
         <projectUrl>https://github.com/michaelrsweet/pappl</projectUrl>
@@ -13,10 +13,11 @@
         <requireLicenseAcceptance>false</requireLicenseAcceptance>
         <description>PDFio Library for VS2019+</description>
         <summary>PDFio is a simple C library for reading and writing PDF files. PDFio is licensed under the Apache License Version 2.0 with an (optional) exception to allow linking against GNU GPL2-only software.</summary>
-        <copyright>Copyright © 2019-2023 by Michael R Sweet</copyright>
+        <copyright>Copyright © 2019-2025 by Michael R Sweet</copyright>
         <tags>pdf file native</tags>
 	<dependencies>
-	    <dependency id="pdfio_native.redist" version="1.1.3" />
+	    <dependency id="pdfio_native.redist" version="1.5.1" />
+	    <dependency id="libpng_native.redist" version="1.6.30" />
 	    <dependency id="zlib_native.redist" version="1.2.11" />
 	</dependencies>
     </metadata>

pdfio_native.redist.nuspec

@@ -3,7 +3,7 @@
     <metadata>
         <id>pdfio_native.redist</id>
         <title>PDFio Library for VS2019+</title>
-        <version>1.1.3</version>
+        <version>1.5.1</version>
         <authors>Michael R Sweet</authors>
         <owners>michaelrsweet</owners>
         <projectUrl>https://github.com/michaelrsweet/pappl</projectUrl>
@@ -13,9 +13,10 @@
         <requireLicenseAcceptance>false</requireLicenseAcceptance>
         <description>PDFio Library for VS2019+</description>
         <summary>PDFio is a simple C library for reading and writing PDF files. This package provides the redistributable content for the PDFio library. PDFio is licensed under the Apache License Version 2.0 with an (optional) exception to allow linking against GNU GPL2-only software.</summary>
-        <copyright>Copyright © 2019-2023 by Michael R Sweet</copyright>
+        <copyright>Copyright © 2019-2025 by Michael R Sweet</copyright>
         <tags>pdf file native</tags>
 	<dependencies>
+	    <dependency id="libpng_native.redist" version="1.6.30" />
 	    <dependency id="zlib_native.redist" version="1.2.11" />
 	</dependencies>
     </metadata>

pdfiototext.c

@@ -1,95 +0,0 @@
-//
-// PDF to text program for PDFio.
-//
-// Copyright © 2022 by Michael R Sweet.
-//
-// Licensed under Apache License v2.0.  See the file "LICENSE" for more
-// information.
-//
-// Usage:
-//
-//   ./pdfiototext FILENAME.pdf > FILENAME.txt
-//
-
-#include "pdfio.h"
-#include <string.h>
-
-
-//
-// 'main()' - Main entry.
-//
-
-int					// O - Exit status
-main(int  argc,				// I - Number of command-line arguments
-     char *argv[])			// I - Command-line arguments
-{
-  pdfio_file_t	*file;			// PDF file
-  size_t	i, j,			// Looping vars
-		num_pages,		// Number of pages
-		num_streams;		// Number of streams for page
-  pdfio_obj_t	*obj;			// Current page object
-  pdfio_stream_t *st;			// Current page content stream
-  char		buffer[1024];		// String buffer
-  bool		first;			// First string token?
-
-
-  // Verify command-line arguments...
-  if (argc != 2)
-  {
-    puts("Usage: pdfiototext FILENAME.pdf > FILENAME.txt");
-    return (1);
-  }
-
-  // Open the PDF file...
-  if ((file = pdfioFileOpen(argv[1], NULL, NULL, NULL, NULL)) == NULL)
-    return (1);
-
-//  printf("%s: %u pages\n", argv[1], (unsigned)pdfioFileGetNumPages(file));
-
-  // Try grabbing content from all of the pages...
-  for (i = 0, num_pages = pdfioFileGetNumPages(file); i < num_pages; i ++)
-  {
-    if ((obj = pdfioFileGetPage(file, i)) == NULL)
-      continue;
-
-    num_streams = pdfioPageGetNumStreams(obj);
-
-//    printf("%s: page%u=%p, num_streams=%u\n", argv[1], (unsigned)i, obj, (unsigned)num_streams);
-
-    for (j = 0; j < num_streams; j ++)
-    {
-      if ((st = pdfioPageOpenStream(obj, j, true)) == NULL)
-	continue;
-
-//      printf("%s: page%u st%u=%p\n", argv[1], (unsigned)i, (unsigned)j, st);
-
-      first = true;
-      while (pdfioStreamGetToken(st, buffer, sizeof(buffer)))
-      {
-	if (buffer[0] == '(')
-	{
-	  if (first)
-	    first = false;
-	  else
-	    putchar(' ');
-
-	  fputs(buffer + 1, stdout);
-	}
-	else if (!strcmp(buffer, "Td") || !strcmp(buffer, "TD") || !strcmp(buffer, "T*") || !strcmp(buffer, "\'") || !strcmp(buffer, "\""))
-	{
-	  putchar('\n');
-	  first = true;
-	}
-      }
-
-      if (!first)
-	putchar('\n');
-
-      pdfioStreamClose(st);
-    }
-  }
-
-  pdfioFileClose(file);
-
-  return (0);
-}

runtests.bat

@@ -0,0 +1,18 @@
+:: Script to run unit test program
+::
+:: Usage:
+::
+::   .\runtests.bat x64\{Debug|Release}
+::
+
+:: Copy dependent DLLs to the named build directory
+echo Copying DLLs
+copy packages\libpng_native.redist.1.6.30\build\native\bin\x64\Debug\*.dll %1
+copy packages\libpng_native.redist.1.6.30\build\native\bin\x64\Release\*.dll %1
+copy packages\zlib_native.redist.1.2.11\build\native\bin\x64\Debug\*.dll %1
+copy packages\zlib_native.redist.1.2.11\build\native\bin\x64\Release\*.dll %1
+
+:: Run unit test program
+echo Running %1\testpdfio.exe
+cd %1
+testpdfio.exe

testfiles/iso22028-2-romm-rgb.txt

@@ -1,3 +1,7 @@
+https://www.color.org/chardata/rgb/rommrgb.xalter
+
+Copyright © 2006 Hewlett-Packard
+
 Terms of use
 
 This profile is made available by ICC, and may be copied, distributed, embedded, made, used, and sold without restriction. Altered versions of this profile shall have the original identification and copyright information removed and shall not be misrepresented as the original profile.

testfiles/pngsuite-LICENSE.txt

@@ -0,0 +1,9 @@
+PngSuite
+--------
+
+Permission to use, copy, modify and distribute these images for any
+purpose and without fee is hereby granted.
+
+
+(c) Willem van Schaik, 1996, 2011
+