pdfio/README.md

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pdfio - PDF Read/Write Library
==============================
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![Version](https://img.shields.io/github/v/release/michaelrsweet/pdfio?include_prereleases)
![Apache 2.0](https://img.shields.io/github/license/michaelrsweet/pdfio)
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[![Build Status](https://img.shields.io/github/workflow/status/michaelrsweet/pdfio/Build)](https://github.com/michaelrsweet/pdfio/actions/workflows/build.yml)
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[![Coverity Scan Status](https://img.shields.io/coverity/scan/22385.svg)](https://scan.coverity.com/projects/michaelrsweet-pdfio)
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PDFio is a simple C library for reading and writing PDF files. The primary
goals of PDFio are:
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- Read and write any version of PDF file
- Provide access to pages, objects, and streams within a PDF file
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- Support reading and writing of encrypted PDF files
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- Extract or embed useful metadata (author, creator, page information, etc.)
- "Filter" PDF files, for example to extract a range of pages or to embed fonts
that are missing from a PDF
- Provide access to objects used for each page
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PDFio is *not* concerned with rendering or viewing a PDF file, although a PDF
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RIP or viewer could be written using it.
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Requirements
------------
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PDFio requires the following to build the software:
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- 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
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
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documentation (`pdfio.html`) for information on using PDFio.
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Installing pdfio
----------------
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PDFio comes with a portable makefile that will work on any POSIX-compliant
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system with ZLIB installed. To make it, run:
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make all
To test it, run:
make test
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".
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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 "")
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- `DESTDIR` and `DSTROOT`: specifies a root directory when installing
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(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")
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Visual Studio Project
---------------------
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The Visual Studio solution ("pdfio.sln") is provided for Windows developers and
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generates the PDFIO1 DLL. You can also use NuGet to install the `pdfio_native`
package.
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Xcode Project
-------------
There is also an Xcode project ("pdfio.xcodeproj") you can use on macOS which
generates a static library that will be installed under "/usr/local" with:
sudo xcodebuild install
You can reproduce this with the makefile using:
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sudo make macos install
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Legal Stuff
-----------
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PDFio is Copyright © 2021-2023 by Michael R Sweet.
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This software is licensed under the Apache License Version 2.0 with an
(optional) exception to allow linking against GPL2/LGPL2 software. See the
files "LICENSE" and "NOTICE" for more information.