.TH pdfio 3 "pdf read/write library" "2024-12-19" "pdf read/write library" .SH NAME pdfio \- pdf read/write library .SH Introduction .PP PDFio is a simple C library for reading and writing PDF files. The primary goals of pdfio are: .IP \(bu 5 .PP Read and write any version of PDF file .IP \(bu 5 .PP Provide access to pages, objects, and streams within a PDF file .IP \(bu 5 .PP Support reading and writing of encrypted PDF files .IP \(bu 5 .PP Extract or embed useful metadata (author, creator, page information, etc.) .IP \(bu 5 .PP "Filter" PDF files, for example to extract a range of pages or to embed fonts that are missing from a PDF .IP \(bu 5 .PP Provide access to objects used for each page .PP PDFio is .I not concerned with rendering or viewing a PDF file, although a PDF RIP or viewer could be written using it. .PP PDFio is Copyright \[co] 2021\-2024 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. .SS Requirements .PP PDFio requires the following to build the software: .IP \(bu 5 .PP A C99 compiler such as Clang, GCC, or MS Visual C .IP \(bu 5 .PP A POSIX\-compliant make program .IP \(bu 5 .PP A POSIX\-compliant sh program .IP \(bu 5 .PP ZLIB (https://www.zlib.net) 1.0 or higher .PP IDE files for Xcode (macOS/iOS) and Visual Studio (Windows) are also provided. .SS Installing PDFio .PP PDFio comes with a configure script that creates a portable makefile that will work on any POSIX\-compliant system with ZLIB installed. To make it, run: .nf \./configure make .fi .PP To test it, run: .nf make test .fi .PP To install it, run: .nf sudo make install .fi .PP If you want a shared library, run: .nf \./configure \-\-enable\-shared make sudo make install .fi .PP The default installation location is "/usr/local". Pass the \-\-prefix option to make to install it to another location: .nf \./configure \-\-prefix=/some/other/directory .fi .PP Other configure options can be found using the \-\-help option: .nf \./configure \-\-help .fi .SS Visual Studio Project .PP The Visual Studio solution ("pdfio.sln") is provided for Windows developers and generates both a static library and DLL. .SS Xcode Project .PP 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: .nf sudo xcodebuild install .fi .SS Detecting PDFio .PP PDFio can be detected using the pkg\-config command, for example: .nf if pkg\-config \-\-exists pdfio; then ... fi .fi .PP In a makefile you can add the necessary compiler and linker options with: .nf CFLAGS += `pkg\-config \-\-cflags pdfio` LIBS += `pkg\-config \-\-libs pdfio` .fi .PP On Windows, you need to link to the PDFIO1.LIB (DLL) library and include the zlib_native NuGet package dependency. You can also use the published pdfio_native NuGet package. .SS Header Files .PP PDFio provides a primary header file that is always used: .nf #include .fi .PP PDFio also provides PDF content helper functions for producing PDF content that are defined in a separate header file: .nf #include .fi .SS Understanding PDF Files .PP A PDF file provides data and commands for displaying pages of graphics and text, and is structured in a way that allows it to be displayed in the same way across multiple devices and platforms. The following is a PDF which shows "Hello, World!" on one page: .nf %PDF\-1.0 % Header starts here %âãÏÓ 1 0 obj % Body starts here << /Kids [2 0 R] /Count 1 /Type /Pages >> endobj 2 0 obj << /Rotate 0 /Parent 1 0 R /Resources 3 0 R /MediaBox [0 0 612 792] /Contents [4 0 R]/Type /Page >> endobj 3 0 obj << /Font << /F0 << /BaseFont /Times\-Italic /Subtype /Type1 /Type /Font >> >> >> endobj 4 0 obj << /Length 65 >> stream 1. 0. 0. 1. 50. 700. cm BT /F0 36. Tf (Hello, World!) Tj ET endstream endobj 5 0 obj << /Pages 1 0 R /Type /Catalog >> endobj xref % Cross\-reference table starts here 0 6 0000000000 65535 f 0000000015 00000 n 0000000074 00000 n 0000000192 00000 n 0000000291 00000 n 0000000409 00000 n trailer % Trailer starts here << /Root 5 0 R /Size 6 >> startxref 459 %%EOF .fi .PP Header .PP The header is the first line of a PDF file that specifies the version of the PDF format that has been used, for example %PDF\-1.0\. .PP Since PDF files almost always contain binary data, they can become corrupted if line endings are changed. For example, if the file is transferred using FTP in text mode or is edited in Notepad on Windows. To allow legacy file transfer programs to determine that the file is binary, the PDF standard recommends including some bytes with character codes higher than 127 in the header, for example: .nf %âãÏÓ .fi .PP The percent sign indicates a comment line while the other few bytes are arbitrary character codes in excess of 127. So, the whole header in our example is: .nf %PDF\-1.0 %âãÏÓ .fi .PP Body .PP The file body consists of a sequence of objects, each preceded by an object number, generation number, and the obj keyword on one line, and followed by the endobj keyword on another. For example: .nf 1 0 obj << /Kids [2 0 R] /Count 1 /Type /Pages >> endobj .fi .PP In this example, the object number is 1 and the generation number is 0, meaning it is the first version of the object. The content for object 1 is between the initial 1 0 obj and trailing endobj lines. In this case, the content is the dictionary <>\. .PP Cross\-Reference Table .PP The cross\-reference table lists the byte offset of each object in the file body. This allows random access to objects, meaning they don't have to be read in order. Objects that are not used are never read, making the process efficient. Operations like counting the number of pages in a PDF document are fast, even in large files. .PP Each object has an object number and a generation number. Generation numbers are used when a cross\-reference table entry is reused. For simplicity, we will assume generation numbers to be always zero and ignore them. The cross\-reference table consists of a header line that indicates the number of entries, a free entry line for object 0, and a line for each of the objects in the file body. For example: .nf 0 6 % Six entries in table, starting at 0 0000000000 65535 f % Free entry for object 0 0000000015 00000 n % Object 1 is at byte offset 15 0000000074 00000 n % Object 2 is at byte offset 74 0000000192 00000 n % etc... 0000000291 00000 n 0000000409 00000 n % Object 5 is at byte offset 409 .fi .PP Trailer .PP The first line of the trailer is just the trailer keyword. This is followed by the trailer dictionary which contains at least the /Size entry specifying the number of entries in the cross\-reference table and the /Root entry which references the object for the document catalog which is the root element of the graph of objects in the body. .PP There follows a line with just the startxref keyword, a line with a single number specifying the byte offset of the start of the cross\-reference table within the file, and then the line %%EOF which signals the end of the PDF file. .nf trailer % Trailer keyword << % The trailer dictinonary /Root 5 0 R /Size 6 >> startxref % startxref keyword 459 % Byte offset of cross\-reference table %%EOF % End\-of\-file marker .fi .SH API Overview .PP PDFio exposes several types: .IP \(bu 5 .PP pdfio_file_t: A PDF file (for reading or writing) .IP \(bu 5 .PP pdfio_array_t: An array of values .IP \(bu 5 .PP pdfio_dict_t: A dictionary of key/value pairs in a PDF file, object, etc. .IP \(bu 5 .PP pdfio_obj_t: An object in a PDF file .IP \(bu 5 .PP pdfio_stream_t: An object stream .SS Reading PDF Files .PP You open an existing PDF file using the pdfioFileOpen function: .nf pdfio_file_t *pdf = pdfioFileOpen("myinputfile.pdf", password_cb, password_data, error_cb, error_data); .fi .PP where the five arguments to the function are the filename ("myinputfile.pdf"), an optional password callback function (password_cb) and data pointer value (password_data), and an optional error callback function (error_cb) and data pointer value (error_data). The password callback is called for encrypted PDF files that are not using the default password, for example: .nf const char * password_cb(void *data, const char *filename) { (void)data; // This callback doesn't use the data pointer (void)filename; // This callback doesn't use the filename // Return a password string for the file... return ("Password42"); } .fi .PP 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: .nf 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); } .fi .PP The default error callback (NULL) does the equivalent of the above. .PP 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: .nf 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 } .fi .PP 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. Use the pdfioPageGetNumStreams and pdfioPageOpenStream functions to access the content streams for each page, and pdfioObjGetDict to get the associated page object dictionary. For example, if you want to display the media and crop boxes for a given page: .nf pdfio_file_t *pdf; // PDF file size_t i; // Looping var size_t count; // Number of pages pdfio_obj_t *page; // Current page pdfio_dict_t *dict; // Current page dictionary pdfio_array_t *media_box; // MediaBox array double media_values[4]; // MediaBox values pdfio_array_t *crop_box; // CropBox array double crop_values[4]; // CropBox values // Iterate the pages in the PDF file for (i = 0, count = pdfioFileGetNumPages(pdf); i < count; i ++) { page = pdfioFileGetPage(pdf, i); dict = pdfioObjGetDict(page); media_box = pdfioDictGetArray(dict, "MediaBox"); media_values[0] = pdfioArrayGetNumber(media_box, 0); media_values[1] = pdfioArrayGetNumber(media_box, 1); media_values[2] = pdfioArrayGetNumber(media_box, 2); media_values[3] = pdfioArrayGetNumber(media_box, 3); crop_box = pdfioDictGetArray(dict, "CropBox"); crop_values[0] = pdfioArrayGetNumber(crop_box, 0); crop_values[1] = pdfioArrayGetNumber(crop_box, 1); crop_values[2] = pdfioArrayGetNumber(crop_box, 2); crop_values[3] = pdfioArrayGetNumber(crop_box, 3); printf("Page %u: MediaBox=[%g %g %g %g], CropBox=[%g %g %g %g]\\n", (unsigned)(i + 1), media_values[0], media_values[1], media_values[2], media_values[3], crop_values[0], crop_values[1], crop_values[2], crop_values[3]); } .fi .PP Page object dictionaries have several (mostly optional) key/value pairs, including: .IP \(bu 5 .PP "Annots": An array of annotation dictionaries for the page; use pdfioDictGetArray to get the array .IP \(bu 5 .PP "CropBox": The crop box as an array of four numbers for the left, bottom, right, and top coordinates of the target media; use pdfioDictGetArray to get a pointer to the array of numbers .IP \(bu 5 .PP "Dur": The number of seconds the page should be displayed; use pdfioDictGetNumber to get the page duration value .IP \(bu 5 .PP "Group": The dictionary of transparency group values for the page; use pdfioDictGetDict to get a pointer to the resources dictionary .IP \(bu 5 .PP "LastModified": The date and time when this page was last modified; use pdfioDictGetDate to get the Unix time_t value .IP \(bu 5 .PP "Parent": The parent page tree node object for this page; use pdfioDictGetObj to get a pointer to the object .IP \(bu 5 .PP "MediaBox": The media box as an array of four numbers for the left, bottom, right, and top coordinates of the target media; use pdfioDictGetArray to get a pointer to the array of numbers .IP \(bu 5 .PP "Resources": The dictionary of resources for the page; use pdfioDictGetDict to get a pointer to the resources dictionary .IP \(bu 5 .PP "Rotate": A number indicating the number of degrees of counter\-clockwise rotation to apply to the page when viewing; use pdfioDictGetNumber to get the rotation angle .IP \(bu 5 .PP "Thumb": A thumbnail image object for the page; use pdfioDictGetObj to get a pointer to the thumbnail image object .IP \(bu 5 .PP "Trans": The page transition dictionary; use pdfioDictGetDict to get a pointer to the dictionary .PP The pdfioFileClose function closes a PDF file and frees all memory that was used for it: .nf pdfioFileClose(pdf); .fi .SS Writing PDF Files .PP You create a new PDF file using the pdfioFileCreate function: .nf 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); .fi .PP 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). .PP Alternately you can stream a PDF file using the pdfioFileCreateOutput function: .nf 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 = pdfioFileCreateOutput(output_cb, output_ctx, "2.0", &media_box, &crop_box, error_cb, error_data); .fi .PP Once the file is created, use the pdfioFileCreateObj, pdfioFileCreatePage, and pdfioPageCopy functions to create objects and pages in the file. .PP Finally, the pdfioFileClose function writes the PDF cross\-reference and "trailer" information, closes the file, and frees all memory that was used for it. .SS PDF Objects .PP 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. .PP 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: .IP \(bu 5 .PP pdfioObjGetArray returns an object's array value, if any .IP \(bu 5 .PP pdfioObjGetDict returns an object's dictionary value, if any .IP \(bu 5 .PP pdfioObjGetLength returns the length of the data stream, if any .IP \(bu 5 .PP pdfioObjGetSubtype returns the sub\-type name of the object, for example "Image" for an image object. .IP \(bu 5 .PP pdfioObjGetType returns the type name of the object, for example "XObject" for an image object. .SS PDF Streams .PP 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: .nf pdfio_file_t *pdf = pdfioFileOpen(...); pdfio_obj_t *obj = pdfioFileFindObj(pdf, number); pdfio_stream_t *st = pdfioObjOpenStream(obj, true); .fi .PP 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. .PP When reading a page stream you'll use the pdfioPageOpenStream function instead: .nf pdfio_file_t *pdf = pdfioFileOpen(...); pdfio_obj_t *obj = pdfioFileGetPage(pdf, number); pdfio_stream_t *st = pdfioPageOpenStream(obj, 0, true); .fi .PP Once you have the stream open, you can use one of several functions to read from it: .IP \(bu 5 .PP pdfioStreamConsume reads and discards a number of bytes in the stream .IP \(bu 5 .PP pdfioStreamGetToken reads a PDF token from the stream .IP \(bu 5 .PP pdfioStreamPeek peeks at the next stream data without advancing or "consuming" it .IP \(bu 5 .PP pdfioStreamRead reads a buffer of data .PP When you are done reading from the stream, call the pdfioStreamClose function: .nf pdfioStreamClose(st); .fi .PP To create a stream for a new object, call the pdfioObjCreateStream function: .nf pdfio_file_t *pdf = pdfioFileCreate(...); pdfio_obj_t *obj = pdfioFileCreateObj(pdf, ...); pdfio_stream_t *st = pdfioObjCreateStream(obj, PDFIO_FILTER_FLATE); .fi .PP 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. .PP To create a page content stream call the pdfioFileCreatePage function: .nf pdfio_file_t *pdf = pdfioFileCreate(...); pdfio_dict_t *dict = pdfioDictCreate(pdf); \... set page dictionary keys and values ... pdfio_stream_t *st = pdfioFileCreatePage(pdf, dict); .fi .PP Once you have created the stream, use any of the following functions to write to the stream: .IP \(bu 5 .PP pdfioStreamPrintf writes a formatted string to the stream .IP \(bu 5 .PP pdfioStreamPutChar writes a single character to the stream .IP \(bu 5 .PP pdfioStreamPuts writes a C string to the stream .IP \(bu 5 .PP pdfioStreamWrite writes a buffer of data to the stream .PP The PDF content helper functions provide additional functions for writing specific PDF page stream commands. .PP When you are done writing the stream, call pdfioStreamClose to close both the stream and the object. .SS PDF Content Helper Functions .PP PDFio includes many helper functions for embedding or writing specific kinds of content to a PDF file. These functions can be roughly grouped into five categories: .IP \(bu 5 .PP Color Space Functions .IP \(bu 5 .PP Font Object Functions .IP \(bu 5 .PP Image Object Functions .IP \(bu 5 .PP Page Stream Functions .IP \(bu 5 .PP Page Dictionary Functions .PP Color Space Functions .PP 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: .IP \(bu 5 .PP pdfioArrayCreateColorFromICCObj creates a color array for an ICC color profile object .IP \(bu 5 .PP pdfioArrayCreateColorFromMatrix creates a color array using a CIE XYZ color transform matrix, a gamma value, and a CIE XYZ white point .IP \(bu 5 .PP pdfioArrayCreateColorFromPalette creates an indexed color array from an array of sRGB values .IP \(bu 5 .PP pdfioArrayCreateColorFromPrimaries creates a color array using CIE XYZ primaries and a gamma value .IP \(bu 5 .PP pdfioArrayCreateColorFromStandard creates a color array for a standard color space .PP You can embed an ICC color profile using the pdfioFileCreateICCObjFromFile function: .nf pdfio_file_t *pdf = pdfioFileCreate(...); pdfio_obj_t *icc = pdfioFileCreateICCObjFromFile(pdf, "filename.icc"); .fi .PP where the first argument is the PDF file and the second argument is the filename of the ICC color profile. .PP PDFio also includes predefined constants for creating a few standard color spaces: .nf pdfio_file_t *pdf = pdfioFileCreate(...); // Create an AdobeRGB color array pdfio_array_t *adobe_rgb = pdfioArrayCreateColorFromStandard(pdf, 3, PDFIO_CS_ADOBE); // Create an Display P3 color array pdfio_array_t *display_p3 = pdfioArrayCreateColorFromStandard(pdf, 3, PDFIO_CS_P3_D65); // Create an sRGB color array pdfio_array_t *srgb = pdfioArrayCreateColorFromStandard(pdf, 3, PDFIO_CS_SRGB); .fi .PP Font Object Functions .PP 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: .IP \(bu 5 .PP "Courier" .IP \(bu 5 .PP "Courier\-Bold" .IP \(bu 5 .PP "Courier\-BoldItalic" .IP \(bu 5 .PP "Courier\-Italic" .IP \(bu 5 .PP "Helvetica" .IP \(bu 5 .PP "Helvetica\-Bold" .IP \(bu 5 .PP "Helvetica\-BoldOblique" .IP \(bu 5 .PP "Helvetica\-Oblique" .IP \(bu 5 .PP "Symbol" .IP \(bu 5 .PP "Times\-Bold" .IP \(bu 5 .PP "Times\-BoldItalic" .IP \(bu 5 .PP "Times\-Italic" .IP \(bu 5 .PP "Times\-Roman" .IP \(bu 5 .PP "ZapfDingbats" .PP Except for Symbol and ZapfDingbats (which use a custom 8\-bit character set), PDFio always uses the Windows CP1252 subset of Unicode for these fonts. .PP The second function is pdfioFileCreateFontObjFromFile which creates a font object from a TrueType/OpenType font file, for example: .nf pdfio_file_t *pdf = pdfioFileCreate(...); pdfio_obj_t *arial = pdfioFileCreateFontObjFromFile(pdf, "OpenSans\-Regular.ttf", false); .fi .PP 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: .nf pdfio_file_t *pdf = pdfioFileCreate(...); pdfio_obj_t *arial = pdfioFileCreateFontObjFromFile(pdf, "NotoSansJP\-Regular.otf", true); .fi .PP will embed the NotoSansJP Regular OpenType font with full support for Unicode. .PP Note: Not all fonts support Unicode, and most do not contain a full complement of Unicode characters. pdfioFileCreateFontObjFromFile does not perform any character subsetting, so the entire font file is embedded in the PDF file. .PP Image Object Functions .PP PDF supports images with many different color spaces and bit depths with optional transparency. PDFio provides two helper functions for creating image objects that can be referenced in page streams. The first function is pdfioFileCreateImageObjFromData which creates an image object from data in memory, for example: .nf pdfio_file_t *pdf = pdfioFileCreate(...); unsigned char data[1024 * 1024 * 4]; // 1024x1024 RGBA image data pdfio_obj_t *img = pdfioFileCreateImageObjFromData(pdf, data, /*width*/1024, /*height*/1024, /*num_colors*/3, /*color_data*/NULL, /*alpha*/true, /*interpolate*/false); .fi .PP will create an object for a 1024x1024 RGBA image in memory, using the default color space for 3 colors ("DeviceRGB"). We can use one of the color space functions to use a specific color space for this image, for example: .nf pdfio_file_t *pdf = pdfioFileCreate(...); // Create an AdobeRGB color array pdfio_array_t *adobe_rgb = pdfioArrayCreateColorFromMatrix(pdf, 3, pdfioAdobeRGBGamma, pdfioAdobeRGBMatrix, pdfioAdobeRGBWhitePoint); // Create a 1024x1024 RGBA image using AdobeRGB unsigned char data[1024 * 1024 * 4]; // 1024x1024 RGBA image data pdfio_obj_t *img = pdfioFileCreateImageObjFromData(pdf, data, /*width*/1024, /*height*/1024, /*num_colors*/3, /*color_data*/adobe_rgb, /*alpha*/true, /*interpolate*/false); .fi .PP The "interpolate" argument specifies whether the colors in the image should be smoothed/interpolated when scaling. This is most useful for photographs but should be false for screenshot and barcode images. .PP If you have a JPEG or PNG file, use the pdfioFileCreateImageObjFromFile function to copy the image into a PDF image object, for example: .nf pdfio_file_t *pdf = pdfioFileCreate(...); pdfio_obj_t *img = pdfioFileCreateImageObjFromFile(pdf, "myphoto.jpg", /*interpolate*/true); .fi .PP Note: Currently pdfioFileCreateImageObjFromFile does not support 12 bit JPEG files or PNG files with an alpha channel. .PP Page Dictionary Functions .PP PDF pages each have an associated dictionary to specify the images, fonts, and color spaces used by the page. PDFio provides functions to add these resources to the dictionary: .IP \(bu 5 .PP pdfioPageDictAddColorSpace adds a named color space to the page dictionary .IP \(bu 5 .PP pdfioPageDictAddFont adds a named font to the page dictionary .IP \(bu 5 .PP pdfioPageDictAddImage adds a named image to the page dictionary .PP Page Stream Functions .PP PDF page streams contain textual commands for drawing on the page. PDFio provides many functions for writing these commands with the correct format and escaping, as needed: .IP \(bu 5 .PP pdfioContentClip clips future drawing to the current path .IP \(bu 5 .PP pdfioContentDrawImage draws an image object .IP \(bu 5 .PP pdfioContentFill fills the current path .IP \(bu 5 .PP pdfioContentFillAndStroke fills and strokes the current path .IP \(bu 5 .PP pdfioContentMatrixConcat concatenates a matrix with the current transform matrix .IP \(bu 5 .PP pdfioContentMatrixRotate concatenates a rotation matrix with the current transform matrix .IP \(bu 5 .PP pdfioContentMatrixScale concatenates a scaling matrix with the current transform matrix .IP \(bu 5 .PP pdfioContentMatrixTranslate concatenates a translation matrix with the current transform matrix .IP \(bu 5 .PP pdfioContentPathClose closes the current path .IP \(bu 5 .PP pdfioContentPathCurve appends a Bezier curve to the current path .IP \(bu 5 .PP pdfioContentPathCurve13 appends a Bezier curve with 2 control points to the current path .IP \(bu 5 .PP pdfioContentPathCurve23 appends a Bezier curve with 2 control points to the current path .IP \(bu 5 .PP pdfioContentPathLineTo appends a line to the current path .IP \(bu 5 .PP pdfioContentPathMoveTo moves the current point in the current path .IP \(bu 5 .PP pdfioContentPathRect appends a rectangle to the current path .IP \(bu 5 .PP pdfioContentRestore restores a previous graphics state .IP \(bu 5 .PP pdfioContentSave saves the current graphics state .IP \(bu 5 .PP pdfioContentSetDashPattern sets the line dash pattern .IP \(bu 5 .PP pdfioContentSetFillColorDeviceCMYK sets the current fill color using a device CMYK color .IP \(bu 5 .PP pdfioContentSetFillColorDeviceGray sets the current fill color using a device gray color .IP \(bu 5 .PP pdfioContentSetFillColorDeviceRGB sets the current fill color using a device RGB color .IP \(bu 5 .PP pdfioContentSetFillColorGray sets the current fill color using a calibrated gray color .IP \(bu 5 .PP pdfioContentSetFillColorRGB sets the current fill color using a calibrated RGB color .IP \(bu 5 .PP pdfioContentSetFillColorSpace sets the current fill color space .IP \(bu 5 .PP pdfioContentSetFlatness sets the flatness for curves .IP \(bu 5 .PP pdfioContentSetLineCap sets how the ends of lines are stroked .IP \(bu 5 .PP pdfioContentSetLineJoin sets how connections between lines are stroked .IP \(bu 5 .PP pdfioContentSetLineWidth sets the width of stroked lines .IP \(bu 5 .PP pdfioContentSetMiterLimit sets the miter limit for stroked lines .IP \(bu 5 .PP pdfioContentSetStrokeColorDeviceCMYK sets the current stroke color using a device CMYK color .IP \(bu 5 .PP pdfioContentSetStrokeColorDeviceGray sets the current stroke color using a device gray color .IP \(bu 5 .PP pdfioContentSetStrokeColorDeviceRGB sets the current stroke color using a device RGB color .IP \(bu 5 .PP pdfioContentSetStrokeColorGray sets the current stroke color using a calibrated gray color .IP \(bu 5 .PP pdfioContentSetStrokeColorRGB sets the current stroke color using a calibrated RGB color .IP \(bu 5 .PP pdfioContentSetStrokeColorSpace sets the current stroke color space .IP \(bu 5 .PP pdfioContentSetTextCharacterSpacing sets the spacing between characters for text .IP \(bu 5 .PP pdfioContentSetTextFont sets the font and size for text .IP \(bu 5 .PP pdfioContentSetTextLeading sets the line height for text .IP \(bu 5 .PP pdfioContentSetTextMatrix concatenates a matrix with the current text matrix .IP \(bu 5 .PP pdfioContentSetTextRenderingMode sets the text rendering mode .IP \(bu 5 .PP pdfioContentSetTextRise adjusts the baseline for text .IP \(bu 5 .PP pdfioContentSetTextWordSpacing sets the spacing between words for text .IP \(bu 5 .PP pdfioContentSetTextXScaling sets the horizontal scaling for text .IP \(bu 5 .PP pdfioContentStroke strokes the current path .IP \(bu 5 .PP pdfioContentTextBegin begins a block of text .IP \(bu 5 .PP pdfioContentTextEnd ends a block of text .IP \(bu 5 .PP pdfioContentTextMoveLine moves to the next line with an offset in a text block .IP \(bu 5 .PP pdfioContentTextMoveTo moves within the current line in a text block .IP \(bu 5 .PP pdfioContentTextNewLine moves to the beginning of the next line in a text block .IP \(bu 5 .PP pdfioContentTextNewLineShow moves to the beginning of the next line in a text block and shows literal text with optional word and character spacing .IP \(bu 5 .PP pdfioContentTextNewLineShowf moves to the beginning of the next line in a text block and shows formatted text with optional word and character spacing .IP \(bu 5 .PP pdfioContentTextShow draws a literal string in a text block .IP \(bu 5 .PP pdfioContentTextShowf draws a formatted string in a text block .IP \(bu 5 .PP pdfioContentTextShowJustified draws an array of literal strings with offsets between them .SH Examples .SS Read PDF Metadata .PP The pdfioinfo.c example program opens a PDF file and prints the title, author, creation date, and number of pages: .nf #include #include 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 time_t creation_date; // Creation date struct tm *creation_tm; // Creation date/time information char creation_text[256]; // Creation date/time as a string // 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 creation date and convert to a string... creation_date = pdfioFileGetCreationDate(pdf); creation_tm = localtime(&creation_date); strftime(creation_text, sizeof(creation_text), "%c", creation_tm); // Print file information to stdout... printf("%s:\\n", filename); printf(" Title: %s\\n", pdfioFileGetTitle(pdf)); printf(" Author: %s\\n", pdfioFileGetAuthor(pdf)); printf(" Created On: %s\\n", creation_text); printf(" Number Pages: %u\\n", (unsigned)pdfioFileGetNumPages(pdf)); // Close the PDF file... pdfioFileClose(pdf); return (0); } .fi .SS Create PDF File With Text and Image .PP The image2pdf.c example code creates a PDF file containing a JPEG or PNG image file and optional caption on a single page. The create_pdf_image_file function creates the PDF file, embeds a base font and the named JPEG or PNG image file, and then creates a page with the image centered on the page with any text centered below: .nf #include #include #include bool // O \- True on success, false on failure create_pdf_image_file( const char *pdfname, // I \- PDF filename const char *imagename, // I \- Image 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 // 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); } .fi .SS Generate a Code 128 Barcode .PP One\-dimensional barcodes are often rendered using special fonts that map ASCII characters to sequences of bars that can be read. The examples directory contains such a font (code128.ttf) to create "Code 128" barcodes, with an accompanying bit of example code in code128.c\. .PP The first thing you need to do is prepare the barcode string to use with the font. Each barcode begins with a start pattern followed by the characters or digits you want to encode, a weighted sum digit, and a stop pattern. The make_code128 function creates this string: .nf 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_start_code_b = '\\314'; // Start code B 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); } .fi .PP The main function does the rest of the work. The barcode font is imported using the pdfioFileCreateFontObjFromFile function. We pass false for the "unicode" argument since we just want the (default) ASCII encoding: .nf barcode_font = pdfioFileCreateFontObjFromFile(pdf, "code128.ttf", /*unicode*/false); .fi .PP Since barcodes usually have the number or text represented by the barcode printed underneath it, we also need a regular text font, for which we can choose one of the standard 14 PostScript base fonts using the pdfioFIleCreateFontObjFromBase function: .nf text_font = pdfioFileCreateFontObjFromBase(pdf, "Helvetica"); .fi .PP Once we have these fonts we can measure the barcode and regular text labels using the pdfioContentTextMeasure function to determine how large the PDF page needs to be to hold the barcode and text: .nf // Compute sizes of the text... const char *barcode = argv[1]; char barcode_temp[256]; if (!(barcode[0] & 0x80)) barcode = make_code128(barcode_temp, barcode, sizeof(barcode_temp)); double barcode_height = 36.0; double barcode_width = pdfioContentTextMeasure(barcode_font, barcode, barcode_height); const char *text = argv[2]; double text_height = 0.0; double text_width = 0.0; if (text && text_font) { text_height = 9.0; text_width = pdfioContentTextMeasure(text_font, text, text_height); } // Compute the size of the PDF page... pdfio_rect_t media_box; 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; .fi .PP Finally, we just need to create a page of the specified size that references the two fonts: .nf // 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); .fi .PP With the barcode font called "B128" and the text font called "TEXT", we can use them to draw two strings: .nf // 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); .fi .SS Convert Markdown to PDF .PP Markdown is a simple plain text format that supports things like headings, links, character styles, tables, and embedded images. The md2pdf.c example code uses the mmd library to convert markdown to a PDF file that can be distributed. .PP Note: The md2pdf example is by far the most complex example code included with PDFio and shows how to layout text, add headers and footers, add links, embed images, and format tables. .SH ENUMERATIONS .SS pdfio_cs_e Standard color spaces .TP 5 PDFIO_CS_ADOBE .br AdobeRGB 1998 .TP 5 PDFIO_CS_P3_D65 .br Display P3 .TP 5 PDFIO_CS_SRGB .br sRGB .SS pdfio_encryption_e PDF encryption modes .TP 5 PDFIO_ENCRYPTION_AES_128 .br 128-bit AES encryption (PDF 1.6) .TP 5 PDFIO_ENCRYPTION_AES_256 .br 256-bit AES encryption (PDF 2.0) .TP 5 PDFIO_ENCRYPTION_NONE .br No encryption .TP 5 PDFIO_ENCRYPTION_RC4_128 .br 128-bit RC4 encryption (PDF 1.4) .TP 5 PDFIO_ENCRYPTION_RC4_40 .br 40-bit RC4 encryption (PDF 1.3) .SS pdfio_filter_e Compression/decompression filters for streams .TP 5 PDFIO_FILTER_ASCII85 .br ASCII85Decode filter (reading only) .TP 5 PDFIO_FILTER_ASCIIHEX .br ASCIIHexDecode filter (reading only) .TP 5 PDFIO_FILTER_CCITTFAX .br CCITTFaxDecode filter .TP 5 PDFIO_FILTER_CRYPT .br Encryption filter .TP 5 PDFIO_FILTER_DCT .br DCTDecode (JPEG) filter .TP 5 PDFIO_FILTER_FLATE .br FlateDecode filter .TP 5 PDFIO_FILTER_JBIG2 .br JBIG2Decode filter .TP 5 PDFIO_FILTER_JPX .br JPXDecode filter (reading only) .TP 5 PDFIO_FILTER_LZW .br LZWDecode filter (reading only) .TP 5 PDFIO_FILTER_NONE .br No filter .TP 5 PDFIO_FILTER_RUNLENGTH .br RunLengthDecode filter (reading only) .SS pdfio_linecap_e Line capping modes .TP 5 PDFIO_LINECAP_BUTT .br Butt ends .TP 5 PDFIO_LINECAP_ROUND .br Round ends .TP 5 PDFIO_LINECAP_SQUARE .br Square ends .SS pdfio_linejoin_e Line joining modes .TP 5 PDFIO_LINEJOIN_BEVEL .br Bevel joint .TP 5 PDFIO_LINEJOIN_MITER .br Miter joint .TP 5 PDFIO_LINEJOIN_ROUND .br Round joint .SS pdfio_permission_e PDF permission bits .TP 5 PDFIO_PERMISSION_ALL .br .TP 5 PDFIO_PERMISSION_ANNOTATE .br PDF allows annotation .TP 5 PDFIO_PERMISSION_ASSEMBLE .br PDF allows assembly (insert, delete, or rotate pages, add document outlines and thumbnails) .TP 5 PDFIO_PERMISSION_COPY .br PDF allows copying .TP 5 PDFIO_PERMISSION_FORMS .br PDF allows filling in forms .TP 5 PDFIO_PERMISSION_MODIFY .br PDF allows modification .TP 5 PDFIO_PERMISSION_NONE .br No permissions .TP 5 PDFIO_PERMISSION_PRINT .br PDF allows printing .TP 5 PDFIO_PERMISSION_PRINT_HIGH .br PDF allows high quality printing .TP 5 PDFIO_PERMISSION_READING .br PDF allows screen reading/accessibility (deprecated in PDF 2.0) .TP 5 ~0 .br All permissions .SS pdfio_textrendering_e Text rendering modes .TP 5 PDFIO_TEXTRENDERING_FILL .br Fill text .TP 5 PDFIO_TEXTRENDERING_FILL_AND_STROKE .br Fill then stroke text .TP 5 PDFIO_TEXTRENDERING_FILL_AND_STROKE_PATH .br Fill then stroke text and add to path .TP 5 PDFIO_TEXTRENDERING_FILL_PATH .br Fill text and add to path .TP 5 PDFIO_TEXTRENDERING_INVISIBLE .br Don't fill or stroke (invisible) .TP 5 PDFIO_TEXTRENDERING_STROKE .br Stroke text .TP 5 PDFIO_TEXTRENDERING_STROKE_PATH .br Stroke text and add to path .TP 5 PDFIO_TEXTRENDERING_TEXT_PATH .br Add text to path (invisible) .SS pdfio_valtype_e PDF value types .TP 5 PDFIO_VALTYPE_ARRAY .br Array .TP 5 PDFIO_VALTYPE_BINARY .br Binary data .TP 5 PDFIO_VALTYPE_BOOLEAN .br Boolean .TP 5 PDFIO_VALTYPE_DATE .br Date/time .TP 5 PDFIO_VALTYPE_DICT .br Dictionary .TP 5 PDFIO_VALTYPE_INDIRECT .br Indirect object (N G obj) .TP 5 PDFIO_VALTYPE_NAME .br Name .TP 5 PDFIO_VALTYPE_NONE .br No value, not set .TP 5 PDFIO_VALTYPE_NULL .br Null object .TP 5 PDFIO_VALTYPE_NUMBER .br Number (integer or real) .TP 5 PDFIO_VALTYPE_STRING .br String .SH FUNCTIONS .SS pdfioArrayAppendArray Add an array value to an array. .PP .nf bool pdfioArrayAppendArray ( pdfio_array_t *a, pdfio_array_t *value ); .fi .SS pdfioArrayAppendBinary Add a binary string value to an array. .PP .nf bool pdfioArrayAppendBinary ( pdfio_array_t *a, const unsigned char *value, size_t valuelen ); .fi .SS pdfioArrayAppendBoolean Add a boolean value to an array. .PP .nf bool pdfioArrayAppendBoolean ( pdfio_array_t *a, bool value ); .fi .SS pdfioArrayAppendDate Add a date value to an array. .PP .nf bool pdfioArrayAppendDate ( pdfio_array_t *a, time_t value ); .fi .SS pdfioArrayAppendDict Add a dictionary to an array. .PP .nf bool pdfioArrayAppendDict ( pdfio_array_t *a, pdfio_dict_t *value ); .fi .SS pdfioArrayAppendName Add a name to an array. .PP .nf bool pdfioArrayAppendName ( pdfio_array_t *a, const char *value ); .fi .SS pdfioArrayAppendNumber Add a number to an array. .PP .nf bool pdfioArrayAppendNumber ( pdfio_array_t *a, double value ); .fi .SS pdfioArrayAppendObj Add an indirect object reference to an array. .PP .nf bool pdfioArrayAppendObj ( pdfio_array_t *a, pdfio_obj_t *value ); .fi .SS pdfioArrayAppendString Add a string to an array. .PP .nf bool pdfioArrayAppendString ( pdfio_array_t *a, const char *value ); .fi .SS pdfioArrayCopy Copy an array. .PP .nf pdfio_array_t * pdfioArrayCopy ( pdfio_file_t *pdf, pdfio_array_t *a ); .fi .SS pdfioArrayCreate Create an empty array. .PP .nf pdfio_array_t * pdfioArrayCreate ( pdfio_file_t *pdf ); .fi .SS pdfioArrayCreateColorFromICCObj Create an ICC-based color space array. .PP .nf pdfio_array_t * pdfioArrayCreateColorFromICCObj ( pdfio_file_t *pdf, pdfio_obj_t *icc_object ); .fi .SS pdfioArrayCreateColorFromMatrix Create a calibrated color space array using a CIE XYZ transform matrix. .PP .nf pdfio_array_t * pdfioArrayCreateColorFromMatrix ( pdfio_file_t *pdf, size_t num_colors, double gamma, const double matrix[3][3], const double white_point[3] ); .fi .SS pdfioArrayCreateColorFromPalette Create an indexed color space array. .PP .nf pdfio_array_t * pdfioArrayCreateColorFromPalette ( pdfio_file_t *pdf, size_t num_colors, const unsigned char *colors ); .fi .SS pdfioArrayCreateColorFromPrimaries Create a calibrated color sapce array using CIE xy primary chromacities. .PP .nf 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 ); .fi .SS pdfioArrayCreateColorFromStandard Create a color array for a standard color space. .PP .nf pdfio_array_t * pdfioArrayCreateColorFromStandard ( pdfio_file_t *pdf, size_t num_colors, pdfio_cs_t cs ); .fi .PP This function creates a color array for a standard \fBPDFIO_CS_\fR enumerated color space. The "num_colors" argument must be \fB1\fR for grayscale and \fB3\fR for RGB color. .SS pdfioArrayGetArray Get an array value from an array. .PP .nf pdfio_array_t * pdfioArrayGetArray ( pdfio_array_t *a, size_t n ); .fi .SS pdfioArrayGetBinary Get a binary string value from an array. .PP .nf unsigned char * pdfioArrayGetBinary ( pdfio_array_t *a, size_t n, size_t *length ); .fi .SS pdfioArrayGetBoolean Get a boolean value from an array. .PP .nf bool pdfioArrayGetBoolean ( pdfio_array_t *a, size_t n ); .fi .SS pdfioArrayGetDate Get a date value from an array. .PP .nf time_t pdfioArrayGetDate ( pdfio_array_t *a, size_t n ); .fi .SS pdfioArrayGetDict Get a dictionary value from an array. .PP .nf pdfio_dict_t * pdfioArrayGetDict ( pdfio_array_t *a, size_t n ); .fi .SS pdfioArrayGetName Get a name value from an array. .PP .nf const char * pdfioArrayGetName ( pdfio_array_t *a, size_t n ); .fi .SS pdfioArrayGetNumber Get a number from an array. .PP .nf double pdfioArrayGetNumber ( pdfio_array_t *a, size_t n ); .fi .SS pdfioArrayGetObj Get an indirect object reference from an array. .PP .nf pdfio_obj_t * pdfioArrayGetObj ( pdfio_array_t *a, size_t n ); .fi .SS pdfioArrayGetSize Get the length of an array. .PP .nf size_t pdfioArrayGetSize ( pdfio_array_t *a ); .fi .SS pdfioArrayGetString Get a string value from an array. .PP .nf const char * pdfioArrayGetString ( pdfio_array_t *a, size_t n ); .fi .SS pdfioArrayGetType Get a value type from an array. .PP .nf pdfio_valtype_t pdfioArrayGetType ( pdfio_array_t *a, size_t n ); .fi .SS pdfioArrayRemove Remove an array entry. .PP .nf bool pdfioArrayRemove ( pdfio_array_t *a, size_t n ); .fi .SS pdfioContentClip Clip output to the current path. .PP .nf bool pdfioContentClip ( pdfio_stream_t *st, bool even_odd ); .fi .SS pdfioContentDrawImage Draw an image object. .PP .nf bool pdfioContentDrawImage ( pdfio_stream_t *st, const char *name, double x, double y, double width, double height ); .fi .PP The object name must be part of the page dictionary resources, typically using the \fIpdfioPageDictAddImage\fR function. .SS pdfioContentFill Fill the current path. .PP .nf bool pdfioContentFill ( pdfio_stream_t *st, bool even_odd ); .fi .SS pdfioContentFillAndStroke Fill and stroke the current path. .PP .nf bool pdfioContentFillAndStroke ( pdfio_stream_t *st, bool even_odd ); .fi .SS pdfioContentMatrixConcat Concatenate a matrix to the current graphics state. .PP .nf bool pdfioContentMatrixConcat ( pdfio_stream_t *st, pdfio_matrix_t m ); .fi .SS pdfioContentMatrixRotate Rotate the current transform matrix. .PP .nf bool pdfioContentMatrixRotate ( pdfio_stream_t *st, double degrees ); .fi .SS pdfioContentMatrixScale Scale the current transform matrix. .PP .nf bool pdfioContentMatrixScale ( pdfio_stream_t *st, double sx, double sy ); .fi .SS pdfioContentMatrixTranslate Translate the current transform matrix. .PP .nf bool pdfioContentMatrixTranslate ( pdfio_stream_t *st, double tx, double ty ); .fi .SS pdfioContentPathClose Close the current path. .PP .nf bool pdfioContentPathClose ( pdfio_stream_t *st ); .fi .SS pdfioContentPathCurve Add a Bezier curve with two control points. .PP .nf bool pdfioContentPathCurve ( pdfio_stream_t *st, double x1, double y1, double x2, double y2, double x3, double y3 ); .fi .SS pdfioContentPathCurve13 Add a Bezier curve with an initial control point. .PP .nf bool pdfioContentPathCurve13 ( pdfio_stream_t *st, double x1, double y1, double x3, double y3 ); .fi .SS pdfioContentPathCurve23 Add a Bezier curve with a trailing control point. .PP .nf bool pdfioContentPathCurve23 ( pdfio_stream_t *st, double x2, double y2, double x3, double y3 ); .fi .SS pdfioContentPathEnd Clear the current path. .PP .nf bool pdfioContentPathEnd ( pdfio_stream_t *st ); .fi .SS pdfioContentPathLineTo Add a straight line to the current path. .PP .nf bool pdfioContentPathLineTo ( pdfio_stream_t *st, double x, double y ); .fi .SS pdfioContentPathMoveTo Start a new subpath. .PP .nf bool pdfioContentPathMoveTo ( pdfio_stream_t *st, double x, double y ); .fi .SS pdfioContentPathRect Add a rectangle to the current path. .PP .nf bool pdfioContentPathRect ( pdfio_stream_t *st, double x, double y, double width, double height ); .fi .SS pdfioContentRestore Restore a previous graphics state. .PP .nf bool pdfioContentRestore ( pdfio_stream_t *st ); .fi .SS pdfioContentSave Save the current graphics state. .PP .nf bool pdfioContentSave ( pdfio_stream_t *st ); .fi .SS pdfioContentSetDashPattern Set the stroke pattern. .PP .nf bool pdfioContentSetDashPattern ( pdfio_stream_t *st, double phase, double on, double off ); .fi .PP This function sets the stroke pattern when drawing lines. If "on" and "off" are 0, a solid line is drawn. .SS pdfioContentSetFillColorDeviceCMYK Set device CMYK fill color. .PP .nf bool pdfioContentSetFillColorDeviceCMYK ( pdfio_stream_t *st, double c, double m, double y, double k ); .fi .SS pdfioContentSetFillColorDeviceGray Set the device gray fill color. .PP .nf bool pdfioContentSetFillColorDeviceGray ( pdfio_stream_t *st, double g ); .fi .SS pdfioContentSetFillColorDeviceRGB Set the device RGB fill color. .PP .nf bool pdfioContentSetFillColorDeviceRGB ( pdfio_stream_t *st, double r, double g, double b ); .fi .SS pdfioContentSetFillColorGray Set the calibrated gray fill color. .PP .nf bool pdfioContentSetFillColorGray ( pdfio_stream_t *st, double g ); .fi .SS pdfioContentSetFillColorRGB Set the calibrated RGB fill color. .PP .nf bool pdfioContentSetFillColorRGB ( pdfio_stream_t *st, double r, double g, double b ); .fi .SS pdfioContentSetFillColorSpace Set the fill colorspace. .PP .nf bool pdfioContentSetFillColorSpace ( pdfio_stream_t *st, const char *name ); .fi .SS pdfioContentSetFlatness Set the flatness tolerance. .PP .nf bool pdfioContentSetFlatness ( pdfio_stream_t *st, double flatness ); .fi .SS pdfioContentSetLineCap Set the line ends style. .PP .nf bool pdfioContentSetLineCap ( pdfio_stream_t *st, pdfio_linecap_t lc ); .fi .SS pdfioContentSetLineJoin Set the line joining style. .PP .nf bool pdfioContentSetLineJoin ( pdfio_stream_t *st, pdfio_linejoin_t lj ); .fi .SS pdfioContentSetLineWidth Set the line width. .PP .nf bool pdfioContentSetLineWidth ( pdfio_stream_t *st, double width ); .fi .SS pdfioContentSetMiterLimit Set the miter limit. .PP .nf bool pdfioContentSetMiterLimit ( pdfio_stream_t *st, double limit ); .fi .SS pdfioContentSetStrokeColorDeviceCMYK Set the device CMYK stroke color. .PP .nf bool pdfioContentSetStrokeColorDeviceCMYK ( pdfio_stream_t *st, double c, double m, double y, double k ); .fi .SS pdfioContentSetStrokeColorDeviceGray Set the device gray stroke color. .PP .nf bool pdfioContentSetStrokeColorDeviceGray ( pdfio_stream_t *st, double g ); .fi .SS pdfioContentSetStrokeColorDeviceRGB Set the device RGB stroke color. .PP .nf bool pdfioContentSetStrokeColorDeviceRGB ( pdfio_stream_t *st, double r, double g, double b ); .fi .SS pdfioContentSetStrokeColorGray Set the calibrated gray stroke color. .PP .nf bool pdfioContentSetStrokeColorGray ( pdfio_stream_t *st, double g ); .fi .SS pdfioContentSetStrokeColorRGB Set the calibrated RGB stroke color. .PP .nf bool pdfioContentSetStrokeColorRGB ( pdfio_stream_t *st, double r, double g, double b ); .fi .SS pdfioContentSetStrokeColorSpace Set the stroke color space. .PP .nf bool pdfioContentSetStrokeColorSpace ( pdfio_stream_t *st, const char *name ); .fi .SS pdfioContentSetTextCharacterSpacing Set the spacing between characters. .PP .nf bool pdfioContentSetTextCharacterSpacing ( pdfio_stream_t *st, double spacing ); .fi .SS pdfioContentSetTextFont Set the text font and size. .PP .nf bool pdfioContentSetTextFont ( pdfio_stream_t *st, const char *name, double size ); .fi .SS pdfioContentSetTextLeading Set text leading (line height) value. .PP .nf bool pdfioContentSetTextLeading ( pdfio_stream_t *st, double leading ); .fi .SS pdfioContentSetTextMatrix Set the text transform matrix. .PP .nf bool pdfioContentSetTextMatrix ( pdfio_stream_t *st, pdfio_matrix_t m ); .fi .SS pdfioContentSetTextRenderingMode Set the text rendering mode. .PP .nf bool pdfioContentSetTextRenderingMode ( pdfio_stream_t *st, pdfio_textrendering_t mode ); .fi .SS pdfioContentSetTextRise Set the text baseline offset. .PP .nf bool pdfioContentSetTextRise ( pdfio_stream_t *st, double rise ); .fi .SS pdfioContentSetTextWordSpacing Set the inter-word spacing. .PP .nf bool pdfioContentSetTextWordSpacing ( pdfio_stream_t *st, double spacing ); .fi .SS pdfioContentSetTextXScaling Set the horizontal scaling value. .PP .nf bool pdfioContentSetTextXScaling ( pdfio_stream_t *st, double percent ); .fi .SS pdfioContentStroke Stroke the current path. .PP .nf bool pdfioContentStroke ( pdfio_stream_t *st ); .fi .SS pdfioContentTextBegin Begin a text block. .PP .nf bool pdfioContentTextBegin ( pdfio_stream_t *st ); .fi .SS pdfioContentTextEnd End a text block. .PP .nf bool pdfioContentTextEnd ( pdfio_stream_t *st ); .fi .SS pdfioContentTextMeasure Measure a text string and return its width. .PP .nf double pdfioContentTextMeasure ( pdfio_obj_t *font, const char *s, double size ); .fi .PP This function measures the given text string "s" and returns its width based on "size". The text string must always use the UTF-8 (Unicode) encoding but any control characters (such as newlines) are ignored. .SS pdfioContentTextMoveLine Move to the next line and offset. .PP .nf bool pdfioContentTextMoveLine ( pdfio_stream_t *st, double tx, double ty ); .fi .SS pdfioContentTextMoveTo Offset within the current line. .PP .nf bool pdfioContentTextMoveTo ( pdfio_stream_t *st, double tx, double ty ); .fi .SS pdfioContentTextNewLine Move to the next line. .PP .nf bool pdfioContentTextNewLine ( pdfio_stream_t *st ); .fi .SS pdfioContentTextNewLineShow Move to the next line and show text. .PP .nf bool pdfioContentTextNewLineShow ( pdfio_stream_t *st, double ws, double cs, bool unicode, const char *s ); .fi .PP This function moves to the next line and then shows some text with optional word and character spacing 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. .SS pdfioContentTextNewLineShowf Show formatted text. .PP .nf bool pdfioContentTextNewLineShowf ( pdfio_stream_t *st, double ws, double cs, bool unicode, const char *format, ... ); .fi .PP This function moves to the next line and shows some formatted text with optional word and character spacing 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 \fBprintf\fR-style format string. .SS pdfioContentTextShow Show text. .PP .nf bool pdfioContentTextShow ( pdfio_stream_t *st, bool unicode, const char *s ); .fi .PP 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. .SS pdfioContentTextShowJustified Show justified text. .PP .nf bool pdfioContentTextShowJustified ( pdfio_stream_t *st, bool unicode, size_t num_fragments, const double *offsets, const char *const *fragments ); .fi .PP 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. .SS pdfioContentTextShowf .PP .nf bool pdfioContentTextShowf ( pdfio_stream_t *st, bool unicode, const char *format, ... ); .fi .SS pdfioDictClear Remove a key/value pair from a dictionary. .PP .nf bool pdfioDictClear ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictCopy Copy a dictionary to a PDF file. .PP .nf pdfio_dict_t * pdfioDictCopy ( pdfio_file_t *pdf, pdfio_dict_t *dict ); .fi .SS pdfioDictCreate Create a dictionary to hold key/value pairs. .PP .nf pdfio_dict_t * pdfioDictCreate ( pdfio_file_t *pdf ); .fi .SS pdfioDictGetArray Get a key array value from a dictionary. .PP .nf pdfio_array_t * pdfioDictGetArray ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictGetBinary Get a key binary string value from a dictionary. .PP .nf unsigned char * pdfioDictGetBinary ( pdfio_dict_t *dict, const char *key, size_t *length ); .fi .SS pdfioDictGetBoolean Get a key boolean value from a dictionary. .PP .nf bool pdfioDictGetBoolean ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictGetDate Get a date value from a dictionary. .PP .nf time_t pdfioDictGetDate ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictGetDict Get a key dictionary value from a dictionary. .PP .nf pdfio_dict_t * pdfioDictGetDict ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictGetKey Get the key for the specified pair. .PP .nf const char * pdfioDictGetKey ( pdfio_dict_t *dict, size_t n ); .fi .SS pdfioDictGetName Get a key name value from a dictionary. .PP .nf const char * pdfioDictGetName ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictGetNumPairs Get the number of key/value pairs in a dictionary. .PP .nf size_t pdfioDictGetNumPairs ( pdfio_dict_t *dict ); .fi .SS pdfioDictGetNumber Get a key number value from a dictionary. .PP .nf double pdfioDictGetNumber ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictGetObj Get a key indirect object value from a dictionary. .PP .nf pdfio_obj_t * pdfioDictGetObj ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictGetRect Get a key rectangle value from a dictionary. .PP .nf pdfio_rect_t * pdfioDictGetRect ( pdfio_dict_t *dict, const char *key, pdfio_rect_t *rect ); .fi .SS pdfioDictGetString Get a key string value from a dictionary. .PP .nf const char * pdfioDictGetString ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictGetType Get a key value type from a dictionary. .PP .nf pdfio_valtype_t pdfioDictGetType ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictIterateKeys Iterate the keys in a dictionary. .PP .nf void pdfioDictIterateKeys ( pdfio_dict_t *dict, pdfio_dict_cb_t cb, void *cb_data ); .fi .PP This function iterates the keys in a dictionary, calling the supplied function "cb": .PP .nf bool my_dict_cb(pdfio_dict_t *dict, const char *key, void *cb_data) { ... "key" contains the dictionary key ... ... return true to continue or false to stop ... } .fi The iteration continues as long as the callback returns \fBtrue\fR or all keys have been iterated. .SS pdfioDictSetArray Set a key array in a dictionary. .PP .nf bool pdfioDictSetArray ( pdfio_dict_t *dict, const char *key, pdfio_array_t *value ); .fi .SS pdfioDictSetBinary Set a key binary string in a dictionary. .PP .nf bool pdfioDictSetBinary ( pdfio_dict_t *dict, const char *key, const unsigned char *value, size_t valuelen ); .fi .SS pdfioDictSetBoolean Set a key boolean in a dictionary. .PP .nf bool pdfioDictSetBoolean ( pdfio_dict_t *dict, const char *key, bool value ); .fi .SS pdfioDictSetDate Set a date value in a dictionary. .PP .nf bool pdfioDictSetDate ( pdfio_dict_t *dict, const char *key, time_t value ); .fi .SS pdfioDictSetDict Set a key dictionary in a dictionary. .PP .nf bool pdfioDictSetDict ( pdfio_dict_t *dict, const char *key, pdfio_dict_t *value ); .fi .SS pdfioDictSetName Set a key name in a dictionary. .PP .nf bool pdfioDictSetName ( pdfio_dict_t *dict, const char *key, const char *value ); .fi .SS pdfioDictSetNull Set a key null in a dictionary. .PP .nf bool pdfioDictSetNull ( pdfio_dict_t *dict, const char *key ); .fi .SS pdfioDictSetNumber Set a key number in a dictionary. .PP .nf bool pdfioDictSetNumber ( pdfio_dict_t *dict, const char *key, double value ); .fi .SS pdfioDictSetObj Set a key indirect object reference in a dictionary. .PP .nf bool pdfioDictSetObj ( pdfio_dict_t *dict, const char *key, pdfio_obj_t *value ); .fi .SS pdfioDictSetRect Set a key rectangle in a dictionary. .PP .nf bool pdfioDictSetRect ( pdfio_dict_t *dict, const char *key, pdfio_rect_t *value ); .fi .SS pdfioDictSetString Set a key literal string in a dictionary. .PP .nf bool pdfioDictSetString ( pdfio_dict_t *dict, const char *key, const char *value ); .fi .SS pdfioDictSetStringf Set a key formatted string in a dictionary. .PP .nf bool pdfioDictSetStringf ( pdfio_dict_t *dict, const char *key, const char *format, ... ); .fi .SS pdfioFileClose Close a PDF file and free all memory used for it. .PP .nf bool pdfioFileClose ( pdfio_file_t *pdf ); .fi .SS pdfioFileCreate Create a PDF file. .PP .nf 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_cbdata ); .fi .PP This function creates a new PDF file. The "filename" argument specifies the name of the PDF file to create. .PP The "version" argument specifies the PDF version number for the file or \fBNULL\fR for the default ("2.0"). .PP The "media_box" and "crop_box" arguments specify the default MediaBox and CropBox for pages in the PDF file - if \fBNULL\fR then a default "Universal" size of 8.27x11in (the intersection of US Letter and ISO A4) is used. .PP The "error_cb" and "error_cbdata" arguments specify an error handler callback and its data pointer - if \fBNULL\fR the default error handler is used that writes error messages to \fBstderr\fR. .SS pdfioFileCreateArrayObj Create a new object in a PDF file containing an array. .PP .nf pdfio_obj_t * pdfioFileCreateArrayObj ( pdfio_file_t *pdf, pdfio_array_t *array ); .fi .PP This function creates a new object with an array value in a PDF file. You must call \fIpdfioObjClose\fR to write the object to the file. .SS pdfioFileCreateFontObjFromBase Create one of the base 14 PDF fonts. .PP .nf pdfio_obj_t * pdfioFileCreateFontObjFromBase ( pdfio_file_t *pdf, const char *name ); .fi .PP This function creates one of the base 14 PDF fonts. The "name" parameter specifies the font nane: .PP .IP \(bu 5 "Courier" .IP \(bu 5 "Courier-Bold" .IP \(bu 5 "Courier-BoldItalic" .IP \(bu 5 "Courier-Italic" .IP \(bu 5 "Helvetica" .IP \(bu 5 "Helvetica-Bold" .IP \(bu 5 "Helvetica-BoldOblique" .IP \(bu 5 "Helvetica-Oblique" .IP \(bu 5 "Symbol" .IP \(bu 5 "Times-Bold" .IP \(bu 5 "Times-BoldItalic" .IP \(bu 5 "Times-Italic" .IP \(bu 5 "Times-Roman" .IP \(bu 5 "ZapfDingbats" .PP Aside from "Symbol" and "Zapf-Dingbats", Base fonts use the Windows CP1252 (ISO-8859-1 with additional characters such as the Euro symbol) subset of Unicode. .SS pdfioFileCreateFontObjFromFile Add a font object to a PDF file. .PP .nf pdfio_obj_t * pdfioFileCreateFontObjFromFile ( pdfio_file_t *pdf, const char *filename, bool unicode ); .fi .PP 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. .SS pdfioFileCreateICCObjFromFile Add an ICC profile object to a PDF file. .PP .nf pdfio_obj_t * pdfioFileCreateICCObjFromFile ( pdfio_file_t *pdf, const char *filename, size_t num_colors ); .fi .SS pdfioFileCreateImageObjFromData Add image object(s) to a PDF file from memory. .PP .nf 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 ); .fi .PP 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 (\fB1\fR for grayscale, \fB3\fR for RGB, and \fB4\fR 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 \fBNULL\fR, the image is encoded in the corresponding device color space. The "interpolate" parameter specifies whether to interpolate when scaling the image on the page. .PP Note: When creating an image object with alpha, a second image object is created to hold the "soft mask" data for the primary image. .SS pdfioFileCreateImageObjFromFile Add an image object to a PDF file from a file. .PP .nf pdfio_obj_t * pdfioFileCreateImageObjFromFile ( pdfio_file_t *pdf, const char *filename, bool interpolate ); .fi .PP 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. .PP .IP 5 Note: Currently PNG support is limited to grayscale, RGB, or indexed files .IP 5 without interlacing or alpha. Transparency (masking) based on color/index .IP 5 is supported. .SS pdfioFileCreateNameObj Create a new object in a PDF file containing a name. .PP .nf pdfio_obj_t * pdfioFileCreateNameObj ( pdfio_file_t *pdf, const char *name ); .fi .PP This function creates a new object with a name value in a PDF file. You must call \fIpdfioObjClose\fR to write the object to the file. .SS pdfioFileCreateNumberObj Create a new object in a PDF file containing a number. .PP .nf pdfio_obj_t * pdfioFileCreateNumberObj ( pdfio_file_t *pdf, double number ); .fi .PP This function creates a new object with a number value in a PDF file. You must call \fIpdfioObjClose\fR to write the object to the file. .SS pdfioFileCreateObj Create a new object in a PDF file. .PP .nf pdfio_obj_t * pdfioFileCreateObj ( pdfio_file_t *pdf, pdfio_dict_t *dict ); .fi .SS pdfioFileCreateOutput Create a PDF file through an output callback. .PP .nf pdfio_file_t * pdfioFileCreateOutput ( pdfio_output_cb_t output_cb, void *output_cbdata, const char *version, pdfio_rect_t *media_box, pdfio_rect_t *crop_box, pdfio_error_cb_t error_cb, void *error_cbdata ); .fi .PP This function creates a new PDF file that is streamed though an output callback. The "output_cb" and "output_cbdata" arguments specify the output callback and its data pointer which is called whenever data needs to be written: .PP .nf ssize_t output_cb(void *output_cbdata, const void *buffer, size_t bytes) { // Write buffer to output and return the number of bytes written } .fi The "version" argument specifies the PDF version number for the file or \fBNULL\fR for the default ("2.0"). .PP The "media_box" and "crop_box" arguments specify the default MediaBox and CropBox for pages in the PDF file - if \fBNULL\fR then a default "Universal" size of 8.27x11in (the intersection of US Letter and ISO A4) is used. .PP The "error_cb" and "error_cbdata" arguments specify an error handler callback and its data pointer - if \fBNULL\fR the default error handler is used that writes error messages to \fBstderr\fR. .PP .IP 5 \fINote\fR: Files created using this API are slightly larger than those .IP 5 created using the \fIpdfioFileCreate\fR function since stream lengths are .IP 5 stored as indirect object references. .SS pdfioFileCreatePage Create a page in a PDF file. .PP .nf pdfio_stream_t * pdfioFileCreatePage ( pdfio_file_t *pdf, pdfio_dict_t *dict ); .fi .SS pdfioFileCreateStringObj Create a new object in a PDF file containing a string. .PP .nf pdfio_obj_t * pdfioFileCreateStringObj ( pdfio_file_t *pdf, const char *string ); .fi .PP This function creates a new object with a string value in a PDF file. You must call \fIpdfioObjClose\fR to write the object to the file. .SS pdfioFileCreateTemporary .PP .nf 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_cbdata ); .fi .SS pdfioFileFindObj Find an object using its object number. .PP .nf pdfio_obj_t * pdfioFileFindObj ( pdfio_file_t *pdf, size_t number ); .fi .PP This differs from \fIpdfioFileGetObj\fR which takes an index into the list of objects while this function takes the object number. .SS pdfioFileGetAuthor Get the author for a PDF file. .PP .nf const char * pdfioFileGetAuthor ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetCatalog Get the document catalog dictionary. .PP .nf pdfio_dict_t * pdfioFileGetCatalog ( pdfio_file_t *pdf ); .fi .PP .SS pdfioFileGetCreationDate Get the creation date for a PDF file. .PP .nf time_t pdfioFileGetCreationDate ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetCreator Get the creator string for a PDF file. .PP .nf const char * pdfioFileGetCreator ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetID Get the PDF file's ID strings. .PP .nf pdfio_array_t * pdfioFileGetID ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetKeywords Get the keywords for a PDF file. .PP .nf const char * pdfioFileGetKeywords ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetName Get a PDF's filename. .PP .nf const char * pdfioFileGetName ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetNumObjs Get the number of objects in a PDF file. .PP .nf size_t pdfioFileGetNumObjs ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetNumPages Get the number of pages in a PDF file. .PP .nf size_t pdfioFileGetNumPages ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetObj Get an object from a PDF file. .PP .nf pdfio_obj_t * pdfioFileGetObj ( pdfio_file_t *pdf, size_t n ); .fi .SS pdfioFileGetPage Get a page object from a PDF file. .PP .nf pdfio_obj_t * pdfioFileGetPage ( pdfio_file_t *pdf, size_t n ); .fi .SS pdfioFileGetPermissions Get the access permissions of a PDF file. .PP .nf pdfio_permission_t pdfioFileGetPermissions ( pdfio_file_t *pdf, pdfio_encryption_t *encryption ); .fi .PP This function returns the access permissions of a PDF file and (optionally) the type of encryption that has been used. .SS pdfioFileGetProducer Get the producer string for a PDF file. .PP .nf const char * pdfioFileGetProducer ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetSubject Get the subject for a PDF file. .PP .nf const char * pdfioFileGetSubject ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetTitle Get the title for a PDF file. .PP .nf const char * pdfioFileGetTitle ( pdfio_file_t *pdf ); .fi .SS pdfioFileGetVersion Get the PDF version number for a PDF file. .PP .nf const char * pdfioFileGetVersion ( pdfio_file_t *pdf ); .fi .SS pdfioFileOpen Open a PDF file for reading. .PP .nf pdfio_file_t * pdfioFileOpen ( const char *filename, pdfio_password_cb_t password_cb, void *password_cbdata, pdfio_error_cb_t error_cb, void *error_cbdata ); .fi .PP This function opens an existing PDF file. The "filename" argument specifies the name of the PDF file to create. .PP The "password_cb" and "password_cbdata" arguments specify a password callback and its data pointer for PDF files that use one of the standard Adobe "security" handlers. The callback returns a password string or \fBNULL\fR to cancel the open. If \fBNULL\fR is specified for the callback function and the PDF file requires a password, the open will always fail. .PP The "error_cb" and "error_cbdata" arguments specify an error handler callback and its data pointer - if \fBNULL\fR the default error handler is used that writes error messages to \fBstderr\fR. .SS pdfioFileSetAuthor Set the author for a PDF file. .PP .nf void pdfioFileSetAuthor ( pdfio_file_t *pdf, const char *value ); .fi .SS pdfioFileSetCreationDate Set the creation date for a PDF file. .PP .nf void pdfioFileSetCreationDate ( pdfio_file_t *pdf, time_t value ); .fi .SS pdfioFileSetCreator Set the creator string for a PDF file. .PP .nf void pdfioFileSetCreator ( pdfio_file_t *pdf, const char *value ); .fi .SS pdfioFileSetKeywords Set the keywords string for a PDF file. .PP .nf void pdfioFileSetKeywords ( pdfio_file_t *pdf, const char *value ); .fi .SS pdfioFileSetPermissions Set the PDF permissions, encryption mode, and passwords. .PP .nf bool pdfioFileSetPermissions ( pdfio_file_t *pdf, pdfio_permission_t permissions, pdfio_encryption_t encryption, const char *owner_password, const char *user_password ); .fi .PP This function sets the PDF usage permissions, encryption mode, and passwords. .PP .IP 5 \fINote\fR: This function must be called before creating or copying any .IP 5 objects. Due to fundamental limitations in the PDF format, PDF encryption .IP 5 offers little protection from disclosure. Permissions are not enforced in .IP 5 any meaningful way. .SS pdfioFileSetSubject Set the subject for a PDF file. .PP .nf void pdfioFileSetSubject ( pdfio_file_t *pdf, const char *value ); .fi .SS pdfioFileSetTitle Set the title for a PDF file. .PP .nf void pdfioFileSetTitle ( pdfio_file_t *pdf, const char *value ); .fi .SS pdfioImageGetBytesPerLine Get the number of bytes to read for each line. .PP .nf size_t pdfioImageGetBytesPerLine ( pdfio_obj_t *obj ); .fi .SS pdfioImageGetHeight Get the height of an image object. .PP .nf double pdfioImageGetHeight ( pdfio_obj_t *obj ); .fi .SS pdfioImageGetWidth Get the width of an image object. .PP .nf double pdfioImageGetWidth ( pdfio_obj_t *obj ); .fi .SS pdfioObjClose Close an object, writing any data as needed to the PDF file. .PP .nf bool pdfioObjClose ( pdfio_obj_t *obj ); .fi .SS pdfioObjCopy Copy an object to another PDF file. .PP .nf pdfio_obj_t * pdfioObjCopy ( pdfio_file_t *pdf, pdfio_obj_t *srcobj ); .fi .SS pdfioObjCreateStream Create an object (data) stream for writing. .PP .nf pdfio_stream_t * pdfioObjCreateStream ( pdfio_obj_t *obj, pdfio_filter_t filter ); .fi .SS pdfioObjGetArray Get the array associated with an object. .PP .nf pdfio_array_t * pdfioObjGetArray ( pdfio_obj_t *obj ); .fi .SS pdfioObjGetDict Get the dictionary associated with an object. .PP .nf pdfio_dict_t * pdfioObjGetDict ( pdfio_obj_t *obj ); .fi .SS pdfioObjGetGeneration Get the object's generation number. .PP .nf unsigned short pdfioObjGetGeneration ( pdfio_obj_t *obj ); .fi .SS pdfioObjGetLength Get the length of the object's (data) stream. .PP .nf size_t pdfioObjGetLength ( pdfio_obj_t *obj ); .fi .SS pdfioObjGetName Get the name value associated with an object. .PP .nf const char * pdfioObjGetName ( pdfio_obj_t *obj ); .fi .SS pdfioObjGetNumber Get the object's number. .PP .nf size_t pdfioObjGetNumber ( pdfio_obj_t *obj ); .fi .SS pdfioObjGetSubtype Get an object's subtype. .PP .nf const char * pdfioObjGetSubtype ( pdfio_obj_t *obj ); .fi .PP This function returns an object's PDF subtype name, if any. Common subtype names include: .PP .IP \(bu 5 "CIDFontType0": A CID Type0 font .IP \(bu 5 "CIDFontType2": A CID TrueType font .IP \(bu 5 "Image": An image or image mask .IP \(bu 5 "Form": A fillable form .IP \(bu 5 "OpenType": An OpenType font .IP \(bu 5 "Type0": A composite font .IP \(bu 5 "Type1": A PostScript Type1 font .IP \(bu 5 "Type3": A PDF Type3 font .IP \(bu 5 "TrueType": A TrueType font .SS pdfioObjGetType Get an object's type. .PP .nf const char * pdfioObjGetType ( pdfio_obj_t *obj ); .fi .PP This function returns an object's PDF type name, if any. Common type names include: .PP .IP \(bu 5 "CMap": A character map for composite fonts .IP \(bu 5 "Font": An embedded font (\fIpdfioObjGetSubtype\fR will tell you the font format) .IP \(bu 5 "FontDescriptor": A font descriptor .IP \(bu 5 "Page": A (visible) page .IP \(bu 5 "Pages": A page tree node .IP \(bu 5 "Template": An invisible template page .IP \(bu 5 "XObject": An image, image mask, or form (\fIpdfioObjGetSubtype\fR will tell you which) .SS pdfioObjOpenStream Open an object's (data) stream for reading. .PP .nf pdfio_stream_t * pdfioObjOpenStream ( pdfio_obj_t *obj, bool decode ); .fi .SS pdfioPageCopy Copy a page to a PDF file. .PP .nf bool pdfioPageCopy ( pdfio_file_t *pdf, pdfio_obj_t *srcpage ); .fi .SS pdfioPageDictAddColorSpace Add a color space to the page dictionary. .PP .nf bool pdfioPageDictAddColorSpace ( pdfio_dict_t *dict, const char *name, pdfio_array_t *data ); .fi .PP This function adds a named color space to the page dictionary. .PP The names "DefaultCMYK", "DefaultGray", and "DefaultRGB" specify the default device color space used for the page. .PP The "data" array contains a calibrated, indexed, or ICC-based color space array that was created using the \fIpdfioArrayCreateCalibratedColorFromMatrix\fR, \fIpdfioArrayCreateCalibratedColorFromPrimaries\fR, \fIpdfioArrayCreateICCBasedColor\fR, or \fIpdfioArrayCreateIndexedColor\fR functions. .SS pdfioPageDictAddFont Add a font object to the page dictionary. .PP .nf bool pdfioPageDictAddFont ( pdfio_dict_t *dict, const char *name, pdfio_obj_t *obj ); .fi .SS pdfioPageDictAddImage Add an image object to the page dictionary. .PP .nf bool pdfioPageDictAddImage ( pdfio_dict_t *dict, const char *name, pdfio_obj_t *obj ); .fi .SS pdfioPageGetNumStreams Get the number of content streams for a page object. .PP .nf size_t pdfioPageGetNumStreams ( pdfio_obj_t *page ); .fi .SS pdfioPageOpenStream Open a content stream for a page. .PP .nf pdfio_stream_t * pdfioPageOpenStream ( pdfio_obj_t *page, size_t n, bool decode ); .fi .SS pdfioStreamClose Close a (data) stream in a PDF file. .PP .nf bool pdfioStreamClose ( pdfio_stream_t *st ); .fi .SS pdfioStreamConsume Consume bytes from the stream. .PP .nf bool pdfioStreamConsume ( pdfio_stream_t *st, size_t bytes ); .fi .SS pdfioStreamGetToken Read a single PDF token from a stream. .PP .nf bool pdfioStreamGetToken ( pdfio_stream_t *st, char *buffer, size_t bufsize ); .fi .PP 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. .SS pdfioStreamPeek Peek at data in a stream. .PP .nf ssize_t pdfioStreamPeek ( pdfio_stream_t *st, void *buffer, size_t bytes ); .fi .SS pdfioStreamPrintf Write a formatted string to a stream. .PP .nf bool pdfioStreamPrintf ( pdfio_stream_t *st, const char *format, ... ); .fi .SS pdfioStreamPutChar Write a single character to a stream. .PP .nf bool pdfioStreamPutChar ( pdfio_stream_t *st, int ch ); .fi .SS pdfioStreamPuts Write a literal string to a stream. .PP .nf bool pdfioStreamPuts ( pdfio_stream_t *st, const char *s ); .fi .SS pdfioStreamRead Read data from a stream. .PP .nf ssize_t pdfioStreamRead ( pdfio_stream_t *st, void *buffer, size_t bytes ); .fi .PP This function reads data from a stream. When reading decoded image data from a stream, you \fImust\fR read whole scanlines. The \fIpdfioImageGetBytesPerLine\fR function can be used to determine the proper read length. .SS pdfioStreamWrite Write data to a stream. .PP .nf bool pdfioStreamWrite ( pdfio_stream_t *st, const void *buffer, size_t bytes ); .fi .SS pdfioStringCreate Create a durable literal string. .PP .nf char * pdfioStringCreate ( pdfio_file_t *pdf, const char *s ); .fi .PP This function creates a literal string associated with the PDF file "pdf". The "s" string points to a nul-terminated C string. .PP \fBNULL\fR is returned on error, otherwise a \fBchar *\fR that is valid until \fBpdfioFileClose\fR is called. .SS pdfioStringCreatef Create a durable formatted string. .PP .nf char * pdfioStringCreatef ( pdfio_file_t *pdf, const char *format, ... ); .fi .PP This function creates a formatted string associated with the PDF file "pdf". The "format" string contains \fBprintf\fR-style format characters. .PP \fBNULL\fR is returned on error, otherwise a \fBchar *\fR that is valid until \fBpdfioFileClose\fR is called. .SH STRUCTURES .SS pdfio_rect_s PDF rectangle .PP .nf struct pdfio_rect_s { double x1; double x2; double y1; double y2; }; .fi .SH TYPES .SS pdfio_array_t Array of PDF values .PP .nf typedef struct _pdfio_array_s pdfio_array_t; .fi .SS pdfio_cs_t Standard color spaces .PP .nf typedef enum pdfio_cs_e pdfio_cs_t; .fi .SS pdfio_dict_cb_t Dictionary iterator callback .PP .nf typedef bool(*)(pdfio_dict_t *dict, const char *key, void *cb_data) pdfio_dict_cb_t; .fi .SS pdfio_dict_t Key/value dictionary .PP .nf typedef struct _pdfio_dict_s pdfio_dict_t; .fi .SS pdfio_encryption_t PDF encryption modes .PP .nf typedef enum pdfio_encryption_e pdfio_encryption_t; .fi .SS pdfio_error_cb_t Error callback .PP .nf typedef bool(*)(pdfio_file_t *pdf, const char *message, void *data) pdfio_error_cb_t; .fi .SS pdfio_file_t PDF file .PP .nf typedef struct _pdfio_file_s pdfio_file_t; .fi .SS pdfio_filter_t Compression/decompression filters for streams .PP .nf typedef enum pdfio_filter_e pdfio_filter_t; .fi .SS pdfio_linecap_t Line capping modes .PP .nf typedef enum pdfio_linecap_e pdfio_linecap_t; .fi .SS pdfio_linejoin_t Line joining modes .PP .nf typedef enum pdfio_linejoin_e pdfio_linejoin_t; .fi .SS pdfio_matrix_t[3][2] Transform matrix .PP .nf typedef double pdfio_matrix_t[3][2]; .fi .SS pdfio_obj_t Numbered object in PDF file .PP .nf typedef struct _pdfio_obj_s pdfio_obj_t; .fi .SS pdfio_output_cb_t Output callback for pdfioFileCreateOutput .PP .nf typedef ssize_t(*)(void *ctx const void *data size_t datalen) pdfio_output_cb_t; .fi .SS pdfio_password_cb_t Password callback for pdfioFileOpen .PP .nf typedef const char *(*)(void *data const char *filename) pdfio_password_cb_t; .fi .SS pdfio_permission_t PDF permission bitfield .PP .nf typedef int pdfio_permission_t; .fi .SS pdfio_rect_t PDF rectangle .PP .nf typedef struct pdfio_rect_s pdfio_rect_t; .fi .SS pdfio_stream_t Object data stream in PDF file .PP .nf typedef struct _pdfio_stream_s pdfio_stream_t; .fi .SS pdfio_textrendering_t Text rendering modes .PP .nf typedef enum pdfio_textrendering_e pdfio_textrendering_t; .fi .SS pdfio_valtype_t PDF value types .PP .nf typedef enum pdfio_valtype_e pdfio_valtype_t; .fi .SH AUTHOR .PP Michael R Sweet .SH COPYRIGHT .PP Copyright (c) 2021-2024 by Michael R Sweet