PDFio Programming Manual v1.0b1
Michael R Sweet
Copyright © 2021 by Michael R Sweet
Michael R Sweet
Copyright © 2021 by Michael R Sweet
PDFio is a simple C library for reading and writing PDF files. The primary goals of pdfio are:
Read any PDF file with or without encryption or linearization
Write PDF files without encryption or linearization
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
PDFio is not concerned with rendering or viewing a PDF file, although a PDF RIP or viewer could be written using it.
PDFio is Copyright © 2021 by Michael R Sweet and 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.
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
IDE files for Xcode (macOS/iOS) and Visual Studio (Windows) are also provided.
PDFio comes with a portable makefile that will work on any POSIX-compliant system with ZLIB installed. To make it, run:
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".
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")
The Visual Studio solution ("pdfio.sln") is provided for Windows developers and generates both a static library and DLL.
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:
sudo make 'COMMONFLAGS="-Os -mmacosx-version-min=10.14 -arch x86_64 -arch arm64"' install
PDFio can be detected using the pkg-config command, for example:
if pkg-config --exists pdfio; then
...
fi
In a makefile you can add the necessary compiler and linker options with:
CFLAGS += `pkg-config --cflags pdfio`
LIBS += `pkg-config --libs pdfio`
On Windows, you need to link to the PDFIO.LIB (static) or PDFIO1.LIB (DLL) libraries and include the "zlib" NuGet package dependency.
PDFio provides a primary header file that is always used:
#include <pdfio.h>
PDFio also provides PDF content helper functions for producing PDF content that are defined in a separate header file:
#include <pdfio-content.h>
PDFio exposes several types:
pdfio_file_t: A PDF file (for reading or writing)
pdfio_array_t: An array of values
pdfio_dict_t: A dictionary of key/value pairs in a PDF file, object, etc.
pdfio_obj_t: An object in a PDF file
pdfio_stream_t: An object stream
You open an existing PDF file using the pdfioFileOpen function:
pdfio_file_t *pdf = pdfioFileOpen("myinputfile.pdf", error_cb, error_data);
where the three arguments to the function are the filename ("myinputfile.pdf"), an optional error callback function (error_cb), and an optional pointer value for the error callback function (error_data). The error callback is called for both errors and warnings and accepts the pdfio_file_t pointer, a message string, and the callback pointer value, for example:
bool
error_cb(pdfio_file_t *pdf, const char *message, void *data)
{
(void)data; // This callback does not use the data pointer
fprintf(stderr, "%s: %s\n", pdfioFileGetName(pdf), message);
// Return false to treat warnings as errors
return (false);
}
The default error callback (NULL) does the equivalent of the above.
Each PDF file contains one or more pages. The pdfioFileGetNumPages function returns the number of pages in the file while the pdfioFileGetPage function gets the specified page in the PDF file:
pdfio_file_t *pdf; // PDF file
size_t i; // Looping var
size_t count; // Number of pages
pdfio_obj_t *page; // Current page
// Iterate the pages in the PDF file
for (i = 0, count = pdfioFileGetNumPages(pdf); i < count; i ++)
{
page = pdfioFileGetPage(pdf, i);
// do something with page
}
Each page is represented by a "page tree" object (what pdfioFileGetPage returns) that specifies information about the page and one or more "content" objects that contain the images, fonts, text, and graphics that appear on the page.
The pdfioFileClose function closes a PDF file and frees all memory that was used for it:
pdfioFileClose(pdf);
You create a new PDF file using the pdfioFileCreate function:
pdfio_rect_t media_box = { 0.0, 0.0, 612.0, 792.0 }; // US Letter
pdfio_rect_t crop_box = { 36.0, 36.0, 576.0, 756.0 }; // w/0.5" margins
pdfio_file_t *pdf = pdfioFileCreate("myoutputfile.pdf", "2.0", &media_box, &crop_box, error_cb, error_data);
where the six arguments to the function are the filename ("myoutputfile.pdf"), PDF version ("2.0"), media box (media_box), crop box (crop_box), an optional error callback function (error_cb), and an optional pointer value for the error callback function (error_data). The units for the media and crop boxes are points (1/72nd of an inch).
Once the file is created, use the pdfioFileCreateObj, pdfioFileCreatePage, and pdfioPageCopy functions to create objects and pages in the file.
Finally, the pdfioFileClose function writes the PDF cross-reference and "trailer" information, closes the file, and frees all memory that was used for it.
PDF objects are identified using two numbers - the object number (1 to N) and the object generation (0 to 65535) that specifies a particular version of an object. An object's numbers are returned by the pdfioObjGetNumber and pdfioObjGetGeneration functions. You can find a numbered object using the pdfioFileFindObj function.
Objects contain values (typically dictionaries) and usually an associated data stream containing images, fonts, ICC profiles, and page content. PDFio provides several accessor functions to get the value(s) associated with an object:
pdfioObjGetArray returns an object's array value, if any
pdfioObjGetDict returns an object's dictionary value, if any
pdfioObjGetLength returns the length of the data stream, if any
pdfioObjGetSubtype returns the sub-type name of the object, for example "Image" for an image object.
pdfioObjGetType returns the type name of the object, for example "XObject" for an image object.
Some PDF objects have an associated data stream, such as for pages, images, ICC color profiles, and fonts. You access the stream for an existing object using the pdfioObjOpenStream function:
pdfio_file_t *pdf = pdfioFileOpen(...);
pdfio_obj_t *obj = pdfioFileFindObj(pdf, number);
pdfio_stream_t *st = pdfioObjOpenStream(obj, true);
The first argument is the object pointer. The second argument is a boolean value that specifies whether you want to decode (typically decompress) the stream data or return it as-is.
Once you have the stream open, you can use one of several functions to read from it:
pdfioStreamConsume reads and discards a number of bytes in the stream
pdfioStreamGetToken reads a PDF token from the stream
pdfioStreamPeek peeks at the next stream data without advancing or "consuming" it
pdfioStreamRead reads a buffer of data
When you are done reading from the stream, call the pdfioStreamClose function:
pdfioStreamClose(st);
To create a stream for a new object, call the pdfioObjCreateStream function:
pdfio_file_t *pdf = pdfioFileCreate(...);
pdfio_obj_t *pdfioFileCreateObj(pdf, ...);
pdfio_stream_t *pdfioObjCreateStream(obj, PDFIO_FILTER_FLATE);
The first argument is the newly created object. The second argument is either PDFIO_FILTER_NONE to specify that any encoding is done by your program or PDFIO_FILTER_FLATE to specify that PDFio should Flate compress the stream.
Once you have created the stream, use any of the following functions to write to the stream:
pdfioStreamPrintf writes a formatted string to the stream
pdfioStreamPutChar writes a single character to the stream
pdfioStreamPuts writes a C string to the stream
pdfioStreamWrite writes a buffer of data to the stream
The PDF content helper functions provide additional functions for writing specific PDF page stream commands.
When you are done writing the stream, call pdfioStreamCLose to close both the stream and the object.
PDFio includes many helper functions for embedding or writing specific kinds of content to a PDF file. These functions can be roughly grouped into ??? categories:
PDF color spaces are specified using well-known names like "DeviceCMYK", "DeviceGray", and "DeviceRGB" or using arrays that define so-called calibrated color spaces. PDFio provides several functions for embedding ICC profiles and creating color space arrays:
pdfioArrayCreateColorFromICCObj creates a color array for an ICC color profile object
pdfioArrayCreateColorFromMatrix creates a color array using a CIE XYZ color transform matrix, a gamma value, and a CIE XYZ white point
pdfioArrayCreateColorFromPalette creates an indexed color array from an array of sRGB values
pdfioArrayCreateColorFromPrimaries creates a color array using CIE XYZ primaries and a gamma value
You can embed an ICC color profile using the pdfioFileCreateICCObjFromFile function:
pdfio_file_t *pdf = pdfioFileCreate(...);
pdfio_obj_t *icc = pdfioFileCreateICCObjFromFile(pdf, "filename.icc");
where the first argument is the PDF file and the second argument is the filename of the ICC color profile.
PDFio also includes predefined constants for creating a few standard color spaces:
pdfio_file_t *pdf = pdfioFileCreate(...);
// Create an AdobeRGB color array
pdfio_array_t *adobe_rgb = pdfioArrayCreateColorFromMatrix(pdf, 3, pdfioAdobeRGBGamma, pdfioAdobeRGBMatrix, pdfioAdobeRGBWhitePoint);
// Create an Display P3 color array
pdfio_array_t *display_p3 = pdfioArrayCreateColorFromMatrix(pdf, 3, pdfioDisplay P3Gamma, pdfioDisplay P3Matrix, pdfioDisplay P3WhitePoint);
// Create an sRGB color array
pdfio_array_t *srgb = pdfioArrayCreateColorFromMatrix(pdf, 3, pdfioSRGBGamma, pdfioSRGBMatrix, pdfioSRGBWhitePoint);
PDF supports many kinds of fonts, including PostScript Type1, PDF Type3, TrueType/OpenType, and CID. PDFio provides two functions for creating font objects. The first is pdfioFileCreateFontObjFromBase which creates a font object for one of the base PDF fonts:
"Courier"
"Courier-Bold"
"Courier-BoldItalic"
"Courier-Italic"
"Helvetica"
"Helvetica-Bold"
"Helvetica-BoldOblique"
"Helvetica-Oblique"
"Symbol"
"Times-Bold"
"Times-BoldItalic"
"Times-Italic"
"Times-Roman"
"ZapfDingbats"
PDFio always uses the Windows CP1252 subset of Unicode for these fonts.
The second function is pdfioFileCreateFontObjFromFile which creates a font object from a TrueType/OpenType font file, for example:
pdfio_file_t *pdf = pdfioFileCreate(...);
pdfio_obj_t *arial = pdfioFileCreateFontObjFromFile(pdf, "OpenSans-Regular.ttf", false);
will embed an OpenSans Regular TrueType font using the Windows CP1252 subset of Unicode. Pass true for the third argument to embed it as a Unicode CID font instead, for example:
pdfio_file_t *pdf = pdfioFileCreate(...);
pdfio_obj_t *arial = pdfioFileCreateFontObjFromFile(pdf, "NotoSansJP-Regular.otf", true);
will embed the NotoSansJP Regular OpenType font with full support for Unicode.
Note: Not all fonts support Unicode.
Add an array value to an array.
bool pdfioArrayAppendArray(pdfio_array_t *a, pdfio_array_t *value);
| a | Array |
|---|---|
| value | Value |
true on success, false on failure
Add a binary string value to an array.
bool pdfioArrayAppendBinary(pdfio_array_t *a, const unsigned char *value, size_t valuelen);
| a | Array |
|---|---|
| value | Value |
| valuelen | Length of value |
true on success, false on failure
Add a boolean value to an array.
bool pdfioArrayAppendBoolean(pdfio_array_t *a, bool value);
| a | Array |
|---|---|
| value | Value |
true on success, false on failure
Add a date value to an array.
bool pdfioArrayAppendDate(pdfio_array_t *a, time_t value);
| a | Array |
|---|---|
| value | Value |
true on success, false on failure
Add a dictionary to an array.
bool pdfioArrayAppendDict(pdfio_array_t *a, pdfio_dict_t *value);
| a | Array |
|---|---|
| value | Value |
true on success, false on failure
Add a name to an array.
bool pdfioArrayAppendName(pdfio_array_t *a, const char *value);
| a | Array |
|---|---|
| value | Value |
true on success, false on failure
Add a number to an array.
bool pdfioArrayAppendNumber(pdfio_array_t *a, double value);
| a | Array |
|---|---|
| value | Value |
true on success, false on failure
Add an indirect object reference to an array.
bool pdfioArrayAppendObj(pdfio_array_t *a, pdfio_obj_t *value);
| a | Array |
|---|---|
| value | Value |
true on success, false on failure
Add a string to an array.
bool pdfioArrayAppendString(pdfio_array_t *a, const char *value);
| a | Array |
|---|---|
| value | Value |
true on success, false on failure
Copy an array.
pdfio_array_t *pdfioArrayCopy(pdfio_file_t *pdf, pdfio_array_t *a);
| PDF file | |
| a | Original array |
New array or NULL on error
Create an empty array.
pdfio_array_t *pdfioArrayCreate(pdfio_file_t *pdf);
| PDF file |
New array or NULL on error
Create an ICC-based color space array.
pdfio_array_t *pdfioArrayCreateColorFromICCObj(pdfio_file_t *pdf, pdfio_obj_t *icc_object);
| PDF file | |
| icc_object | ICC profile object |
Color array
Create a calibrated color space array using a CIE XYZ transform matrix.
pdfio_array_t *pdfioArrayCreateColorFromMatrix(pdfio_file_t *pdf, size_t num_colors, double gamma, const double matrix[3][3], const double white_point[3]);
| PDF file | |
| num_colors | Number of colors (1 or 3) |
| gamma | Gamma value |
| matrix[3][3] | XYZ transform |
| white_point[3] | White point |
Color space array
Create an indexed color space array.
pdfio_array_t *pdfioArrayCreateColorFromPalette(pdfio_file_t *pdf, size_t num_colors, const unsigned char *colors);
| PDF file | |
| num_colors | Number of colors |
| colors | RGB values for colors |
Color array
Create a calibrated color sapce array using CIE xy primary chromacities.
pdfio_array_t *pdfioArrayCreateColorFromPrimaries(pdfio_file_t *pdf, size_t num_colors, double gamma, double wx, double wy, double rx, double ry, double gx, double gy, double bx, double by);
| PDF file | |
| num_colors | Number of colors (1 or 3) |
| gamma | Gama value |
| wx | White point X chromacity |
| wy | White point Y chromacity |
| rx | Red X chromacity |
| ry | Red Y chromacity |
| gx | Green X chromacity |
| gy | Green Y chromacity |
| bx | Blue X chromacity |
| by | Blue Y chromacity |
Color space array
Get an array value from an array.
pdfio_array_t *pdfioArrayGetArray(pdfio_array_t *a, size_t n);
| a | Array |
|---|---|
| n | Index |
Value
Get a binary string value from an array.
unsigned char *pdfioArrayGetBinary(pdfio_array_t *a, size_t n, size_t *length);
| a | Array |
|---|---|
| n | Index |
| length | Length of string |
Value
Get a boolean value from an array.
bool pdfioArrayGetBoolean(pdfio_array_t *a, size_t n);
| a | Array |
|---|---|
| n | Index |
Value
Get a date value from an array.
time_t pdfioArrayGetDate(pdfio_array_t *a, size_t n);
| a | Array |
|---|---|
| n | Index |
Value
Get a dictionary value from an array.
pdfio_dict_t *pdfioArrayGetDict(pdfio_array_t *a, size_t n);
| a | Array |
|---|---|
| n | Index |
Value
Get a name value from an array.
const char *pdfioArrayGetName(pdfio_array_t *a, size_t n);
| a | Array |
|---|---|
| n | Index |
Value
Get a number from an array.
double pdfioArrayGetNumber(pdfio_array_t *a, size_t n);
| a | Array |
|---|---|
| n | Index |
Value
Get an indirect object reference from an array.
pdfio_obj_t *pdfioArrayGetObj(pdfio_array_t *a, size_t n);
| a | Array |
|---|---|
| n | Index |
Value
Get the length of an array.
size_t pdfioArrayGetSize(pdfio_array_t *a);
| a | Array |
|---|
Length of array
Get a string value from an array.
const char *pdfioArrayGetString(pdfio_array_t *a, size_t n);
| a | Array |
|---|---|
| n | Index |
Value
Get a value type from an array.
pdfio_valtype_t pdfioArrayGetType(pdfio_array_t *a, size_t n);
| a | Array |
|---|---|
| n | Index |
Value type
Clip output to the current path.
bool pdfioContentClip(pdfio_stream_t *st, bool even_odd);
| st | Stream |
|---|---|
| even_odd | Even/odd fill vs. non-zero winding rule |
true on success, false on failure
Draw an image object.
bool pdfioContentDrawImage(pdfio_stream_t *st, const char *name, double x, double y, double width, double height);
| st | Stream |
|---|---|
| name | Image name |
| x | X offset of image |
| y | Y offset of image |
| width | Width of image |
| height | Height of image |
true on success, false on failure
The object name must be part of the page dictionary resources, typically
using the pdfioPageDictAddImage function.
Fill the current path.
bool pdfioContentFill(pdfio_stream_t *st, bool even_odd);
| st | Stream |
|---|---|
| even_odd | Even/odd fill vs. non-zero winding rule |
true on success, false on failure
Fill and stroke the current path.
bool pdfioContentFillAndStroke(pdfio_stream_t *st, bool even_odd);
| st | Stream |
|---|---|
| even_odd | Even/odd fill vs. non-zero winding |
true on success, false on failure
Concatenate a matrix to the current graphics state.
bool pdfioContentMatrixConcat(pdfio_stream_t *st, pdfio_matrix_t m);
| st | Stream |
|---|---|
| m | Transform matrix |
true on success, false on failure
Rotate the current transform matrix.
bool pdfioContentMatrixRotate(pdfio_stream_t *st, double degrees);
| st | Stream |
|---|---|
| degrees | Rotation angle in degrees counter-clockwise |
true on success, false on failure
Scale the current transform matrix.
bool pdfioContentMatrixScale(pdfio_stream_t *st, double sx, double sy);
| st | Stream |
|---|---|
| sx | X scale |
| sy | Y scale |
true on success, false on failure
Translate the current transform matrix.
bool pdfioContentMatrixTranslate(pdfio_stream_t *st, double tx, double ty);
| st | Stream |
|---|---|
| tx | X offset |
| ty | Y offset |
true on success, false on failure
Close the current path.
bool pdfioContentPathClose(pdfio_stream_t *st);
| st | Stream |
|---|
true on success, false on failure
Add a Bezier curve with two control points.
bool pdfioContentPathCurve(pdfio_stream_t *st, double x1, double y1, double x2, double y2, double x3, double y3);
| st | Stream |
|---|---|
| x1 | X position 1 |
| y1 | Y position 1 |
| x2 | X position 2 |
| y2 | Y position 2 |
| x3 | X position 3 |
| y3 | Y position 3 |
true on success, false on failure
Add a Bezier curve with an initial control point.
bool pdfioContentPathCurve13(pdfio_stream_t *st, double x1, double y1, double x3, double y3);
| st | Stream |
|---|---|
| x1 | X position 1 |
| y1 | Y position 1 |
| x3 | X position 3 |
| y3 | Y position 3 |
true on success, false on failure
Add a Bezier curve with a trailing control point.
bool pdfioContentPathCurve23(pdfio_stream_t *st, double x2, double y2, double x3, double y3);
| st | Stream |
|---|---|
| x2 | X position 2 |
| y2 | Y position 2 |
| x3 | X position 3 |
| y3 | Y position 3 |
true on success, false on failure
Add a straight line to the current path.
bool pdfioContentPathLineTo(pdfio_stream_t *st, double x, double y);
| st | Stream |
|---|---|
| x | X position |
| y | Y position |
true on success, false on failure
Start a new subpath.
bool pdfioContentPathMoveTo(pdfio_stream_t *st, double x, double y);
| st | Stream |
|---|---|
| x | X position |
| y | Y position |
true on success, false on failure
Add a rectangle to the current path.
bool pdfioContentPathRect(pdfio_stream_t *st, double x, double y, double width, double height);
| st | Stream |
|---|---|
| x | X offset |
| y | Y offset |
| width | Width |
| height | Height |
true on success, false on failure
Restore a previous graphics state.
bool pdfioContentRestore(pdfio_stream_t *st);
| st | Stream |
|---|
true on success, false on failure
Save the current graphics state.
bool pdfioContentSave(pdfio_stream_t *st);
| st | Stream |
|---|
true on success, false on failure
Set the stroke pattern.
bool pdfioContentSetDashPattern(pdfio_stream_t *st, int phase, int on, int off);
| st | Stream |
|---|---|
| phase | Phase (offset within pattern) |
| on | On length |
| off | Off length |
true on success, false on failure
Set device CMYK fill color.
bool pdfioContentSetFillColorDeviceCMYK(pdfio_stream_t *st, double c, double m, double y, double k);
| st | Stream |
|---|---|
| c | Cyan value (0.0 to 1.0) |
| m | Magenta value (0.0 to 1.0) |
| y | Yellow value (0.0 to 1.0) |
| k | Black value (0.0 to 1.0) |
true on success, false on failure
Set the device gray fill color.
bool pdfioContentSetFillColorDeviceGray(pdfio_stream_t *st, double g);
| st | Stream |
|---|---|
| g | Gray value (0.0 to 1.0) |
true on success, false on failure
Set the device RGB fill color.
bool pdfioContentSetFillColorDeviceRGB(pdfio_stream_t *st, double r, double g, double b);
| st | Stream |
|---|---|
| r | Red value (0.0 to 1.0) |
| g | Green value (0.0 to 1.0) |
| b | Blue value (0.0 to 1.0) |
true on success, false on failure
Set the calibrated gray fill color.
bool pdfioContentSetFillColorGray(pdfio_stream_t *st, double g);
| st | Stream |
|---|---|
| g | Gray value (0.0 to 1.0) |
true on success, false on failure
Set the calibrated RGB fill color.
bool pdfioContentSetFillColorRGB(pdfio_stream_t *st, double r, double g, double b);
| st | Stream |
|---|---|
| r | Red value (0.0 to 1.0) |
| g | Green value (0.0 to 1.0) |
| b | Blue value (0.0 to 1.0) |
true on success, false on failure
Set the fill colorspace.
bool pdfioContentSetFillColorSpace(pdfio_stream_t *st, const char *name);
| st | Stream |
|---|---|
| name | Color space name |
true on success, false on failure
Set the flatness tolerance.
bool pdfioContentSetFlatness(pdfio_stream_t *st, double flatness);
| st | Stream |
|---|---|
| flatness | Flatness value (0.0 to 100.0) |
true on success, false on failure
Set the line ends style.
bool pdfioContentSetLineCap(pdfio_stream_t *st, pdfio_linecap_t lc);
| st | Stream |
|---|---|
| lc | Line cap value |
true on success, false on failure
Set the line joining style.
bool pdfioContentSetLineJoin(pdfio_stream_t *st, pdfio_linejoin_t lj);
| st | Stream |
|---|---|
| lj | Line join value |
true on success, false on failure
Set the line width.
bool pdfioContentSetLineWidth(pdfio_stream_t *st, double width);
| st | Stream |
|---|---|
| width | Line width value |
true on success, false on failure
Set the miter limit.
bool pdfioContentSetMiterLimit(pdfio_stream_t *st, double limit);
| st | Stream |
|---|---|
| limit | Miter limit value |
true on success, false on failure
Set the device CMYK stroke color.
bool pdfioContentSetStrokeColorDeviceCMYK(pdfio_stream_t *st, double c, double m, double y, double k);
| st | Stream |
|---|---|
| c | Cyan value (0.0 to 1.0) |
| m | Magenta value (0.0 to 1.0) |
| y | Yellow value (0.0 to 1.0) |
| k | Black value (0.0 to 1.0) |
true on success, false on failure
Set the device gray stroke color.
bool pdfioContentSetStrokeColorDeviceGray(pdfio_stream_t *st, double g);
| st | Stream |
|---|---|
| g | Gray value (0.0 to 1.0) |
true on success, false on failure
Set the device RGB stroke color.
bool pdfioContentSetStrokeColorDeviceRGB(pdfio_stream_t *st, double r, double g, double b);
| st | Stream |
|---|---|
| r | Red value (0.0 to 1.0) |
| g | Green value (0.0 to 1.0) |
| b | Blue value (0.0 to 1.0) |
true on success, false on failure
Set the calibrated gray stroke color.
bool pdfioContentSetStrokeColorGray(pdfio_stream_t *st, double g);
| st | Stream |
|---|---|
| g | Gray value (0.0 to 1.0) |
true on success, false on failure
Set the calibrated RGB stroke color.
bool pdfioContentSetStrokeColorRGB(pdfio_stream_t *st, double r, double g, double b);
| st | Stream |
|---|---|
| r | Red value (0.0 to 1.0) |
| g | Green value (0.0 to 1.0) |
| b | Blue value (0.0 to 1.0) |
true on success, false on failure
Set the stroke color space.
bool pdfioContentSetStrokeColorSpace(pdfio_stream_t *st, const char *name);
| st | Stream |
|---|---|
| name | Color space name |
true on success, false on failure
Set the spacing between characters.
bool pdfioContentSetTextCharacterSpacing(pdfio_stream_t *st, double spacing);
| st | Stream |
|---|---|
| spacing | Character spacing |
true on success, false on failure
Set the text font and size.
bool pdfioContentSetTextFont(pdfio_stream_t *st, const char *name, double size);
| st | Stream |
|---|---|
| name | Font name |
| size | Font size |
true on success, false on failure
Set text leading (line height) value.
bool pdfioContentSetTextLeading(pdfio_stream_t *st, double leading);
| st | Stream |
|---|---|
| leading | Leading (line height) value |
true on success, false on failure
Set the text transform matrix.
bool pdfioContentSetTextMatrix(pdfio_stream_t *st, pdfio_matrix_t m);
| st | Stream |
|---|---|
| m | Transform matrix |
true on success, false on failure
Set the text rendering mode.
bool pdfioContentSetTextRenderingMode(pdfio_stream_t *st, pdfio_textrendering_t mode);
| st | Stream |
|---|---|
| mode | Text rendering mode |
true on success, false on failure
Set the text baseline offset.
bool pdfioContentSetTextRise(pdfio_stream_t *st, double rise);
| st | Stream |
|---|---|
| rise | Y offset |
true on success, false on failure
Set the inter-word spacing.
bool pdfioContentSetTextWordSpacing(pdfio_stream_t *st, double spacing);
| st | Stream |
|---|---|
| spacing | Spacing between words |
true on success, false on failure
Set the horizontal scaling value.
bool pdfioContentSetTextXScaling(pdfio_stream_t *st, double percent);
| st | Stream |
|---|---|
| percent | Horizontal scaling in percent |
true on success, false on failure
Stroke the current path.
bool pdfioContentStroke(pdfio_stream_t *st);
| st | Stream |
|---|
true on success, false on failure
Begin a text block.
bool pdfioContentTextBegin(pdfio_stream_t *st);
| st | Stream |
|---|
true on success, false on failure
End a text block.
bool pdfioContentTextEnd(pdfio_stream_t *st);
| st | Stream |
|---|
true on success, false on failure
Move to the next line and offset.
bool pdfioContentTextMoveLine(pdfio_stream_t *st, double tx, double ty);
| st | Stream |
|---|---|
| tx | X offset |
| ty | Y offset |
true on success, false on failure
Offset within the current line.
bool pdfioContentTextMoveTo(pdfio_stream_t *st, double tx, double ty);
| st | Stream |
|---|---|
| tx | X offset |
| ty | Y offset |
true on success, false on failure
Move to the next line.
bool pdfioContentTextNextLine(pdfio_stream_t *st);
| st | Stream |
|---|
true on success, false on failure
Show text.
bool pdfioContentTextShow(pdfio_stream_t *st, bool unicode, const char *s);
| st | Stream |
|---|---|
| unicode | Unicode text? |
| s | String to show |
true on success, false on failure
This function shows some text in a PDF content stream. The "unicode" argument specifies that the current font maps to full Unicode. The "s" argument specifies a UTF-8 encoded string.
Show justified text.
bool pdfioContentTextShowJustified(pdfio_stream_t *st, bool unicode, size_t num_fragments, const double *offsets, const char *const *fragments);
| st | Stream |
|---|---|
| unicode | Unicode text? |
| num_fragments | Number of text fragments |
| offsets | Text offsets before fragments |
| fragments | Text fragments |
true on success, false on failure
This function shows some text in a PDF content stream. The "unicode" argument specifies that the current font maps to full Unicode. The "fragments" argument specifies an array of UTF-8 encoded strings.
bool pdfioContentTextShowf(pdfio_stream_t *st, bool unicode, const char *format, ...);
| st | Stream |
|---|---|
| unicode | Unicode text? |
| format | printf-style format string |
| ... | Additional arguments as needed |
Show formatted text.
This function shows some text in a PDF content stream. The "unicode" argument
specifies that the current font maps to full Unicode. The "format" argument
specifies a UTF-8 encoded printf-style format string.
Copy a dictionary to a PDF file.
pdfio_dict_t *pdfioDictCopy(pdfio_file_t *pdf, pdfio_dict_t *dict);
| PDF file | |
| dict | Original dictionary |
New dictionary
Create a dictionary to hold key/value pairs.
pdfio_dict_t *pdfioDictCreate(pdfio_file_t *pdf);
| PDF file |
New dictionary
Get a key array value from a dictionary.
pdfio_array_t *pdfioDictGetArray(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
Value
Get a key binary string value from a dictionary.
unsigned char *pdfioDictGetBinary(pdfio_dict_t *dict, const char *key, size_t *length);
| dict | Dictionary |
|---|---|
| key | Key |
| length | Length of value |
Value
Get a key boolean value from a dictionary.
bool pdfioDictGetBoolean(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
Value
Get a date value from a dictionary.
time_t pdfioDictGetDate(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
Value
Get a key dictionary value from a dictionary.
pdfio_dict_t *pdfioDictGetDict(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
Value
Get a key name value from a dictionary.
const char *pdfioDictGetName(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
Value
Get a key number value from a dictionary.
double pdfioDictGetNumber(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
Value
Get a key indirect object value from a dictionary.
pdfio_obj_t *pdfioDictGetObj(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
Value
Get a key rectangle value from a dictionary.
pdfio_rect_t *pdfioDictGetRect(pdfio_dict_t *dict, const char *key, pdfio_rect_t *rect);
| dict | Dictionary |
|---|---|
| key | Key |
| rect | Rectangle |
Rectangle
Get a key string value from a dictionary.
const char *pdfioDictGetString(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
Value
Get a key value type from a dictionary.
pdfio_valtype_t pdfioDictGetType(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
Value type
Set a key array in a dictionary.
bool pdfioDictSetArray(pdfio_dict_t *dict, const char *key, pdfio_array_t *value);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
true on success, false on failure
Set a key binary string in a dictionary.
bool pdfioDictSetBinary(pdfio_dict_t *dict, const char *key, const unsigned char *value, size_t valuelen);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
| valuelen | Length of value |
true on success, false on failure
Set a key boolean in a dictionary.
bool pdfioDictSetBoolean(pdfio_dict_t *dict, const char *key, bool value);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
true on success, false on failure
Set a date value in a dictionary.
bool pdfioDictSetDate(pdfio_dict_t *dict, const char *key, time_t value);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
true on success, false on failure
Set a key dictionary in a dictionary.
bool pdfioDictSetDict(pdfio_dict_t *dict, const char *key, pdfio_dict_t *value);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
true on success, false on failure
Set a key name in a dictionary.
bool pdfioDictSetName(pdfio_dict_t *dict, const char *key, const char *value);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
true on success, false on failure
Set a key null in a dictionary.
bool pdfioDictSetNull(pdfio_dict_t *dict, const char *key);
| dict | Dictionary |
|---|---|
| key | Key |
true on success, false on failure
Set a key number in a dictionary.
bool pdfioDictSetNumber(pdfio_dict_t *dict, const char *key, double value);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
true on success, false on failure
Set a key indirect object reference in a dictionary.
bool pdfioDictSetObj(pdfio_dict_t *dict, const char *key, pdfio_obj_t *value);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
true on success, false on failure
Set a key rectangle in a dictionary.
bool pdfioDictSetRect(pdfio_dict_t *dict, const char *key, pdfio_rect_t *value);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
true on success, false on failure
Set a key literal string in a dictionary.
bool pdfioDictSetString(pdfio_dict_t *dict, const char *key, const char *value);
| dict | Dictionary |
|---|---|
| key | Key |
| value | Value |
true on success, false on failure
Set a key formatted string in a dictionary.
bool pdfioDictSetStringf(pdfio_dict_t *dict, const char *key, const char *format, ...);
| dict | Dictionary |
|---|---|
| key | Key |
| format | printf-style format string |
| ... | Additional arguments as needed |
true on success, false on failure
Close a PDF file and free all memory used for it.
bool pdfioFileClose(pdfio_file_t *pdf);
| PDF file |
true on success and false on failure
Create a PDF file.
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);
| filename | Filename |
|---|---|
| version | PDF version number or NULL for default (2.0) |
| media_box | Default MediaBox for pages |
| crop_box | Default CropBox for pages |
| error_cb | Error callback or NULL for default |
| error_data | Error callback data, if any |
PDF file or NULL on error
Create a new object in a PDF file containing an array.
pdfio_obj_t *pdfioFileCreateArrayObj(pdfio_file_t *pdf, pdfio_array_t *array);
| PDF file | |
| array | Object array |
New object
This function creates a new object with an array value in a PDF file.
You must call pdfioObjClose to write the object to the file.
Create one of the base 14 PDF fonts.
pdfio_obj_t *pdfioFileCreateFontObjFromBase(pdfio_file_t *pdf, const char *name);
| PDF file | |
| name | Font name |
Font object
This function creates one of the base 14 PDF fonts. The "name" parameter specifies the font nane:
Base fonts always use the Windows CP1252 (ISO-8859-1 with additional characters such as the Euro symbol) subset of Unicode.
Add a font object to a PDF file.
pdfio_obj_t *pdfioFileCreateFontObjFromFile(pdfio_file_t *pdf, const char *filename, bool unicode);
| PDF file | |
| filename | Filename |
| unicode | Force Unicode |
Font object
This function embeds a TrueType/OpenType font into a PDF file. The "unicode" parameter controls whether the font is encoded for two-byte characters (potentially full Unicode, but more typically a subset) or to only support the Windows CP1252 (ISO-8859-1 with additional characters such as the Euro symbol) subset of Unicode.
Add an ICC profile object to a PDF file.
pdfio_obj_t *pdfioFileCreateICCObjFromFile(pdfio_file_t *pdf, const char *filename, size_t num_colors);
| PDF file | |
| filename | Filename |
| num_colors | Number of color components (1, 3, or 4) |
Object
Add image object(s) to a PDF file from memory.
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);
| PDF file | |
| data | Pointer to image data |
| width | Width of image |
| height | Height of image |
| num_colors | Number of colors |
| color_data | Colorspace data or NULL for default |
| alpha | true if data contains an alpha channel |
| interpolate | Interpolate image data? |
Object
This function creates image object(s) in a PDF file from a data buffer in
memory. The "data" parameter points to the image data as 8-bit color values.
The "width" and "height" parameters specify the image dimensions. The
"num_colors" parameter specifies the number of color components (1 for
grayscale, 3 for RGB, and 4 for CMYK) and the "alpha" parameter specifies
whether each color tuple is followed by an alpha value. The "color_data"
parameter specifies an optional color space array for the image - if NULL,
the image is encoded in the corresponding device color space. The
"interpolate" parameter specifies whether to interpolate when scaling the
image on the page.
Note: When creating an image object with alpha, a second image object is
created to hold the "soft mask" data for the primary image.
Add an image object to a PDF file from a file.
pdfio_obj_t *pdfioFileCreateImageObjFromFile(pdfio_file_t *pdf, const char *filename, bool interpolate);
| PDF file | |
| filename | Filename |
| interpolate | Interpolate image data? |
Object
This function creates an image object in a PDF file from a JPEG or PNG file.
The "filename" parameter specifies the name of the JPEG or PNG file, while
the "interpolate" parameter specifies whether to interpolate when scaling the
image on the page.
Note: Currently PNG support is limited to grayscale, RGB, or indexed files without interlacing or alpha. Transparency (masking) based on color/index is supported.
Create a new object in a PDF file.
pdfio_obj_t *pdfioFileCreateObj(pdfio_file_t *pdf, pdfio_dict_t *dict);
| PDF file | |
| dict | Object dictionary |
New object
Create a page in a PDF file.
pdfio_stream_t *pdfioFileCreatePage(pdfio_file_t *pdf, pdfio_dict_t *dict);
| PDF file | |
| dict | Page dictionary |
Contents stream
Find an object using its object number.
pdfio_obj_t *pdfioFileFindObj(pdfio_file_t *pdf, size_t number);
| PDF file | |
| number | Object number (1 to N) |
Object or NULL if not found
This differs from pdfioFileGetObj which takes an index into the
list of objects while this function takes the object number.
Get the author for a PDF file.
const char *pdfioFileGetAuthor(pdfio_file_t *pdf);
| PDF file |
Author or NULL for none
Get the creation date for a PDF file.
time_t pdfioFileGetCreationDate(pdfio_file_t *pdf);
| PDF file |
Creation date or 0 for none
Get the creator string for a PDF file.
const char *pdfioFileGetCreator(pdfio_file_t *pdf);
| PDF file |
Creator string or NULL for none
Get the PDF file's ID strings.
pdfio_array_t *pdfioFileGetID(pdfio_file_t *pdf);
| PDF file |
Array with binary strings
Get the keywords for a PDF file.
const char *pdfioFileGetKeywords(pdfio_file_t *pdf);
| PDF file |
Keywords string or NULL for none
Get a PDF's filename.
const char *pdfioFileGetName(pdfio_file_t *pdf);
| PDF file |
Filename
Get the number of objects in a PDF file.
size_t pdfioFileGetNumObjs(pdfio_file_t *pdf);
| PDF file |
Number of objects
Get the number of pages in a PDF file.
size_t pdfioFileGetNumPages(pdfio_file_t *pdf);
| PDF file |
Number of pages
Get an object from a PDF file.
pdfio_obj_t *pdfioFileGetObj(pdfio_file_t *pdf, size_t n);
| PDF file | |
| n | Object index (starting at 0) |
Object
Get a page object from a PDF file.
pdfio_obj_t *pdfioFileGetPage(pdfio_file_t *pdf, size_t n);
| PDF file | |
| n | Page index (starting at 0) |
Object
Get the producer string for a PDF file.
const char *pdfioFileGetProducer(pdfio_file_t *pdf);
| PDF file |
Producer string or NULL for none
Get the subject for a PDF file.
const char *pdfioFileGetSubject(pdfio_file_t *pdf);
| PDF file |
Subject or NULL for none
Get the title for a PDF file.
const char *pdfioFileGetTitle(pdfio_file_t *pdf);
| PDF file |
Title or NULL for none
Get the PDF version number for a PDF file.
const char *pdfioFileGetVersion(pdfio_file_t *pdf);
| PDF file |
Version number or NULL
Open a PDF file for reading.
pdfio_file_t *pdfioFileOpen(const char *filename, pdfio_error_cb_t error_cb, void *error_data);
| filename | Filename |
|---|---|
| error_cb | Error callback or NULL for default |
| error_data | Error callback data, if any |
PDF file
Set the author for a PDF file.
void pdfioFileSetAuthor(pdfio_file_t *pdf, const char *value);
| PDF file | |
| value | Value |
Set the creation date for a PDF file.
void pdfioFileSetCreationDate(pdfio_file_t *pdf, time_t value);
| PDF file | |
| value | Value |
Set the creator string for a PDF file.
void pdfioFileSetCreator(pdfio_file_t *pdf, const char *value);
| PDF file | |
| value | Value |
Set the keywords string for a PDF file.
void pdfioFileSetKeywords(pdfio_file_t *pdf, const char *value);
| PDF file | |
| value | Value |
Set the subject for a PDF file.
void pdfioFileSetSubject(pdfio_file_t *pdf, const char *value);
| PDF file | |
| value | Value |
Set the title for a PDF file.
void pdfioFileSetTitle(pdfio_file_t *pdf, const char *value);
| PDF file | |
| value | Value |
Get the number of bytes to read for each line.
size_t pdfioImageGetBytesPerLine(pdfio_obj_t *obj);
| obj | Image object |
|---|
Number of bytes per line
Get the height of an image object.
double pdfioImageGetHeight(pdfio_obj_t *obj);
| obj | Image object |
|---|
Height in lines
Get the width of an image object.
double pdfioImageGetWidth(pdfio_obj_t *obj);
| obj | Image object |
|---|
Width in columns
Close an object, writing any data as needed to the PDF file.
bool pdfioObjClose(pdfio_obj_t *obj);
| obj | Object |
|---|
true on success, false on failure
Copy an object to another PDF file.
pdfio_obj_t *pdfioObjCopy(pdfio_file_t *pdf, pdfio_obj_t *srcobj);
| PDF file | |
| srcobj | Object to copy |
New object or NULL on error
Create an object (data) stream for writing.
pdfio_stream_t *pdfioObjCreateStream(pdfio_obj_t *obj, pdfio_filter_t filter);
| obj | Object |
|---|---|
| filter | Type of compression to apply |
Stream or NULL on error
Get the array associated with an object.
pdfio_array_t *pdfioObjGetArray(pdfio_obj_t *obj);
| obj | Object |
|---|
Array or NULL on error
Get the dictionary associated with an object.
pdfio_dict_t *pdfioObjGetDict(pdfio_obj_t *obj);
| obj | Object |
|---|
Dictionary or NULL on error
Get the object's generation number.
unsigned short pdfioObjGetGeneration(pdfio_obj_t *obj);
| obj | Object |
|---|
Generation number (0 to 65535)
Get the length of the object's (data) stream.
size_t pdfioObjGetLength(pdfio_obj_t *obj);
| obj | Object |
|---|
Length in bytes or 0 for none
Get the object's number.
size_t pdfioObjGetNumber(pdfio_obj_t *obj);
| obj | Object |
|---|
Object number (1 to 9999999999)
Get an object's subtype.
const char *pdfioObjGetSubtype(pdfio_obj_t *obj);
| obj | Object |
|---|
Object subtype
Get an object's type.
const char *pdfioObjGetType(pdfio_obj_t *obj);
| obj | Object |
|---|
Object type
Open an object's (data) stream for reading.
pdfio_stream_t *pdfioObjOpenStream(pdfio_obj_t *obj, bool decode);
| obj | Object |
|---|---|
| decode | Decode/decompress data? |
Stream or NULL on error
Copy a page to a PDF file.
bool pdfioPageCopy(pdfio_file_t *pdf, pdfio_obj_t *srcpage);
| PDF file | |
| srcpage | Source page |
true on success, false on failure
Add a color space to the page dictionary.
bool pdfioPageDictAddColorSpace(pdfio_dict_t *dict, const char *name, pdfio_array_t *data);
| dict | Page dictionary |
|---|---|
| name | Color space name |
| data | Color space array |
true on success, false on failure
This function adds a named color space to the page dictionary.
The names "DefaultCMYK", "DefaultGray", and "DefaultRGB" specify the default
device color space used for the page.
The "data" array contains a calibrated, indexed, or ICC-based color space
array that was created using the
pdfioArrayCreateCalibratedColorFromMatrix,
pdfioArrayCreateCalibratedColorFromPrimaries,
pdfioArrayCreateICCBasedColor, or
pdfioArrayCreateIndexedColor functions.
Add a font object to the page dictionary.
bool pdfioPageDictAddFont(pdfio_dict_t *dict, const char *name, pdfio_obj_t *obj);
| dict | Page dictionary |
|---|---|
| name | Font name |
| obj | Font object |
true on success, false on failure
Add an image object to the page dictionary.
bool pdfioPageDictAddImage(pdfio_dict_t *dict, const char *name, pdfio_obj_t *obj);
| dict | Page dictionary |
|---|---|
| name | Image name |
| obj | Image object |
true on success, false on failure
Close a (data) stream in a PDF file.
bool pdfioStreamClose(pdfio_stream_t *st);
| st | Stream |
|---|
true on success, false on failure
Consume bytes from the stream.
bool pdfioStreamConsume(pdfio_stream_t *st, size_t bytes);
| st | Stream |
|---|---|
| bytes | Number of bytes to consume |
true on success, false on EOF
Read a single PDF token from a stream.
bool pdfioStreamGetToken(pdfio_stream_t *st, char *buffer, size_t bufsize);
| st | Stream |
|---|---|
| buffer | String buffer |
| bufsize | Size of string buffer |
true on success, false on EOF
Peek at data in a stream.
ssize_t pdfioStreamPeek(pdfio_stream_t *st, void *buffer, size_t bytes);
| st | Stream |
|---|---|
| buffer | Buffer |
| bytes | Size of buffer |
Bytes returned or -1 on error
Write a formatted string to a stream.
bool pdfioStreamPrintf(pdfio_stream_t *st, const char *format, ...);
| st | Stream |
|---|---|
| format | printf-style format string |
| ... | Additional arguments as needed |
true on success, false on failure
Write a single character to a stream.
bool pdfioStreamPutChar(pdfio_stream_t *st, int ch);
| st | Stream |
|---|---|
| ch | Character |
true on success, false on failure
Write a literal string to a stream.
bool pdfioStreamPuts(pdfio_stream_t *st, const char *s);
| st | Stream |
|---|---|
| s | Literal string |
true on success, false on failure
Read data from a stream.
ssize_t pdfioStreamRead(pdfio_stream_t *st, void *buffer, size_t bytes);
| st | Stream |
|---|---|
| buffer | Buffer |
| bytes | Bytes to read |
Number of bytes read or -1 on error
This function reads data from a stream. When reading decoded image data
from a stream, you must read whole scanlines. The
pdfioImageGetBytesPerLine function can be used to determine the
proper read length.
Write data to a stream.
bool pdfioStreamWrite(pdfio_stream_t *st, const void *buffer, size_t bytes);
| st | Stream |
|---|---|
| buffer | Data to write |
| bytes | Number of bytes to write |
true on success or false on failure
Create a durable literal string.
char *pdfioStringCreate(pdfio_file_t *pdf, const char *s);
| PDF file | |
| s | Nul-terminated string |
Durable string pointer or NULL on error
This function creates a literal string associated with the PDF file
"pdf". The "s" string points to a nul-terminated C string.
NULL is returned on error, otherwise a char * that is valid until
pdfioFileClose is called.
Create a durable formatted string.
char *pdfioStringCreatef(pdfio_file_t *pdf, const char *format, ...);
| PDF file | |
| format | printf-style format string |
| ... | Additional args as needed |
Durable string pointer or NULL on error
This function creates a formatted string associated with the PDF file
"pdf". The "format" string contains printf-style format characters.
NULL is returned on error, otherwise a char * that is valid until
pdfioFileClose is called.
Array of PDF values
typedef struct _pdfio_array_s pdfio_array_t;
Key/value dictionary
typedef struct _pdfio_dict_s pdfio_dict_t;
Error callback
typedef bool (*pdfio_error_cb_t)(pdfio_file_t *pdf, const char *message, void *data);
PDF file
typedef struct _pdfio_file_s pdfio_file_t;
Compression/decompression filters for streams
typedef enum pdfio_filter_e pdfio_filter_t;
Line capping modes
typedef enum pdfio_linecap_e pdfio_linecap_t;
Line joining modes
typedef enum pdfio_linejoin_e pdfio_linejoin_t;
Transform matrix
typedef double pdfio_matrix_t[3][2];
Numbered object in PDF file
typedef struct _pdfio_obj_s pdfio_obj_t;
PDF rectangle
typedef struct pdfio_rect_s pdfio_rect_t;
Object data stream in PDF file
typedef struct _pdfio_stream_s pdfio_stream_t;
Text rendering modes
typedef enum pdfio_textrendering_e pdfio_textrendering_t;
PDF value types
typedef enum pdfio_valtype_e pdfio_valtype_t;
PDF rectangle
struct pdfio_rect_s {
double x1;
double x2;
double y1;
double y2;
};
| x1 | Lower-left X coordinate |
|---|---|
| x2 | Upper-right X coordinate |
| y1 | Lower-left Y coordinate |
| y2 | Upper-right Y coordinate |
Compression/decompression filters for streams
| PDFIO_FILTER_ASCII85 | ASCII85Decode filter (reading only) |
|---|---|
| PDFIO_FILTER_ASCIIHEX | ASCIIHexDecode filter (reading only) |
| PDFIO_FILTER_CCITTFAX | CCITTFaxDecode filter |
| PDFIO_FILTER_CRYPT | Encryption filter |
| PDFIO_FILTER_DCT | DCTDecode (JPEG) filter |
| PDFIO_FILTER_FLATE | FlateDecode filter |
| PDFIO_FILTER_JBIG2 | JBIG2Decode filter |
| PDFIO_FILTER_JPX | JPXDecode filter (reading only) |
| PDFIO_FILTER_LZW | LZWDecode filter (reading only) |
| PDFIO_FILTER_NONE | No filter |
| PDFIO_FILTER_RUNLENGTH | RunLengthDecode filter (reading only) |
Line capping modes
| PDFIO_LINECAP_BUTT | Butt ends |
|---|---|
| PDFIO_LINECAP_ROUND | Round ends |
| PDFIO_LINECAP_SQUARE | Square ends |
Line joining modes
| PDFIO_LINEJOIN_BEVEL | Bevel joint |
|---|---|
| PDFIO_LINEJOIN_MITER | Miter joint |
| PDFIO_LINEJOIN_ROUND | Round joint |
Text rendering modes
| PDFIO_TEXTRENDERING_FILL | Fill text |
|---|---|
| PDFIO_TEXTRENDERING_FILL_AND_STROKE | Fill then stroke text |
| PDFIO_TEXTRENDERING_FILL_AND_STROKE_PATH | Fill then stroke text and add to path |
| PDFIO_TEXTRENDERING_FILL_PATH | Fill text and add to path |
| PDFIO_TEXTRENDERING_INVISIBLE | Don't fill or stroke (invisible) |
| PDFIO_TEXTRENDERING_STROKE | Stroke text |
| PDFIO_TEXTRENDERING_STROKE_PATH | Stroke text and add to path |
| PDFIO_TEXTRENDERING_TEXT_PATH | Add text to path (invisible) |
PDF value types
| PDFIO_VALTYPE_ARRAY | Array |
|---|---|
| PDFIO_VALTYPE_BINARY | Binary data |
| PDFIO_VALTYPE_BOOLEAN | Boolean |
| PDFIO_VALTYPE_DATE | Date/time |
| PDFIO_VALTYPE_DICT | Dictionary |
| PDFIO_VALTYPE_INDIRECT | Indirect object (N G obj) |
| PDFIO_VALTYPE_NAME | Name |
| PDFIO_VALTYPE_NONE | No value, not set |
| PDFIO_VALTYPE_NULL | Null object |
| PDFIO_VALTYPE_NUMBER | Number (integer or real) |
| PDFIO_VALTYPE_STRING | String |