mirror of
https://github.com/michaelrsweet/pdfio.git
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214 lines
7.1 KiB
C
214 lines
7.1 KiB
C
//
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// Private header file for pdfio.
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//
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// Copyright © 2021 by Michael R Sweet.
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//
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// Licensed under Apache License v2.0. See the file "LICENSE" for more
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// information.
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//
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#ifndef PDFIO_PRIVATE_H
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# define PDFIO_PRIVATE_H
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//
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// Include necessary headers...
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//
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# include "pdfio.h"
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# include <stdarg.h>
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# include <errno.h>
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# include <inttypes.h>
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# include <fcntl.h>
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# include <unistd.h>
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# include <string.h>
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# include <ctype.h>
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# include <zlib.h>
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//
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// Visibility and other annotations...
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//
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# if defined(__has_extension) || defined(__GNUC__)
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# define PDFIO_INTERNAL __attribute__ ((visibility("hidden")))
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# define PDFIO_PRIVATE __attribute__ ((visibility("default")))
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# define PDFIO_NONNULL(...) __attribute__ ((nonnull(__VA_ARGS__)))
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# define PDFIO_NORETURN __attribute__ ((noreturn))
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# else
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# define PDFIO_INTERNAL
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# define PDFIO_PRIVATE
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# define PDFIO_NONNULL(...)
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# define PDFIO_NORETURN
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# endif // __has_extension || __GNUC__
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//
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// Debug macro...
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//
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# ifdef DEBUG
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# define PDFIO_DEBUG(...) fprintf(stderr, __VA_ARGS__)
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# else
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# define PDFIO_DEBUG(...)
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# endif // DEBUG
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//
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// Types and constants...
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//
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typedef enum _pdfio_mode_e // Read/write mode
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{
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_PDFIO_MODE_READ, // Read a PDF file
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_PDFIO_MODE_WRITE // Write a PDF file
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} _pdfio_mode_t;
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typedef struct _pdfio_value_s // Value structure
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{
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pdfio_valtype_t type; // Type of value
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union
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{
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pdfio_array_t *array; // Array value
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struct
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{
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unsigned char *data; // Data
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size_t datalen; // Length
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} binary; // Binary ("Hex String") data
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bool boolean; // Boolean value
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time_t date; // Date/time value
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pdfio_dict_t *dict; // Dictionary value
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pdfio_obj_t *obj; // Indirect object (N G obj) value
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const char *name; // Name value
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float number; // Number value
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const char *string; // String value
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} value; // Value union
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} _pdfio_value_t;
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struct _pdfio_array_s
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{
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pdfio_file_t *pdf; // PDF file
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size_t num_values, // Number of values in use
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alloc_values; // Number of allocated values
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_pdfio_value_t *values; // Array of values
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};
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typedef struct _pdfio_pair_s // Key/value pair
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{
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const char *key; // Key string
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_pdfio_value_t value; // Value
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} _pdfio_pair_t;
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struct _pdfio_dict_s
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{
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pdfio_file_t *pdf; // PDF file
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size_t num_pairs, // Number of pairs in use
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alloc_pairs; // Number of allocated pairs
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_pdfio_pair_t *pairs; // Array of pairs
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};
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struct _pdfio_file_s // PDF file structure
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{
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char *filename; // Filename
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char *version; // Version number
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_pdfio_mode_t mode; // Read/write mode
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pdfio_error_cb_t error_cb; // Error callback
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void *error_data; // Data for error callback
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// Active file data
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int fd; // File descriptor
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char buffer[8192], // Read/write buffer
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*bufptr, // Pointer into buffer
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*bufend; // End of buffer
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off_t bufpos; // Position in file for start of buffer
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pdfio_dict_t *trailer; // Trailer dictionary
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pdfio_obj_t *root; // Root object/dictionary
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pdfio_obj_t *info; // Information object/dictionary
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// Allocated data elements
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size_t num_arrays, // Number of arrays
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alloc_arrays; // Allocated arrays
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pdfio_array_t **arrays; // Arrays
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size_t num_dicts, // Number of dictionaries
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alloc_dicts; // Allocated dictionaries
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pdfio_dict_t **dicts; // Dictionaries
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size_t num_objs, // Number of objects
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alloc_objs; // Allocated objects
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pdfio_obj_t **objs; // Objects
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size_t num_pages, // Number of pages
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alloc_pages; // Allocated pages
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pdfio_obj_t **pages; // Pages
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size_t num_strings, // Number of strings
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alloc_strings; // Allocated strings
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char **strings; // Nul-terminated strings
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};
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struct _pdfio_obj_s // Object
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{
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pdfio_file_t *pdf; // PDF file
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size_t number; // Number
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unsigned short generation; // Generation
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off_t offset, // Offset to object in file
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length_offset, // Offset to /Length in object dict
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stream_offset; // Offset to start of stream in file
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size_t stream_length; // Length of stream, if any
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pdfio_dict_t *dict; // Dictionary
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pdfio_stream_t *stream; // Open stream, if any
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};
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struct _pdfio_stream_s // Stream
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{
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pdfio_file_t *pdf; // PDF file
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pdfio_obj_t *obj; // Object
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pdfio_filter_t filter; // Compression/decompression filter
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char buffer[8192]; // Read/write buffer
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size_t bufused; // Number of bytes in buffer
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z_stream flate; // Flate filter state
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};
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typedef ssize_t (*_pdfio_tconsume_cb_t)(void *data, size_t bytes);
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typedef ssize_t (*_pdfio_tpeek_cb_t)(void *data, void *buffer, size_t bytes);
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//
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// Functions...
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//
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extern void _pdfioArrayDelete(pdfio_array_t *a) PDFIO_INTERNAL;
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extern _pdfio_value_t *_pdfioArrayGetValue(pdfio_array_t *a, size_t n) PDFIO_INTERNAL;
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extern bool _pdfioArrayWrite(pdfio_array_t *a) PDFIO_INTERNAL;
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extern void _pdfioDictDelete(pdfio_dict_t *dict) PDFIO_INTERNAL;
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extern _pdfio_value_t *_pdfioDictGetValue(pdfio_dict_t *dict, const char *key) PDFIO_INTERNAL;
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extern pdfio_dict_t *_pdfioDictRead(pdfio_file_t *pdf) PDFIO_INTERNAL;
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extern bool _pdfioDictSetValue(pdfio_dict_t *dict, const char *key, _pdfio_value_t *value) PDFIO_INTERNAL;
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extern bool _pdfioDictWrite(pdfio_dict_t *dict, off_t *length) PDFIO_INTERNAL;
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extern bool _pdfioFileConsume(pdfio_file_t *pdf, size_t bytes) PDFIO_INTERNAL;
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extern bool _pdfioFileDefaultError(pdfio_file_t *pdf, const char *message, void *data) PDFIO_INTERNAL;
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extern bool _pdfioFileError(pdfio_file_t *pdf, const char *format, ...) PDFIO_FORMAT(2,3) PDFIO_INTERNAL;
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extern bool _pdfioFileFlush(pdfio_file_t *pdf) PDFIO_INTERNAL;
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extern int _pdfioFileGetChar(pdfio_file_t *pdf) PDFIO_INTERNAL;
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extern bool _pdfioFileGetToken(pdfio_file_t *pdf, char *buffer, size_t bufsize) PDFIO_INTERNAL;
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extern bool _pdfioFileGets(pdfio_file_t *pdf, char *buffer, size_t bufsize) PDFIO_INTERNAL;
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extern ssize_t _pdfioFilePeek(pdfio_file_t *pdf, void *buffer, size_t bytes) PDFIO_INTERNAL;
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extern bool _pdfioFilePrintf(pdfio_file_t *pdf, const char *format, ...) PDFIO_FORMAT(2,3) PDFIO_INTERNAL;
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extern bool _pdfioFilePuts(pdfio_file_t *pdf, const char *s) PDFIO_INTERNAL;
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extern ssize_t _pdfioFileRead(pdfio_file_t *pdf, void *buffer, size_t bytes) PDFIO_INTERNAL;
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extern off_t _pdfioFileSeek(pdfio_file_t *pdf, off_t offset, int whence) PDFIO_INTERNAL;
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extern off_t _pdfioFileTell(pdfio_file_t *pdf) PDFIO_INTERNAL;
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extern bool _pdfioFileWrite(pdfio_file_t *pdf, const void *buffer, size_t bytes) PDFIO_INTERNAL;
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extern void _pdfioObjDelete(pdfio_obj_t *obj) PDFIO_INTERNAL;
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extern void _pdfioStreamDelete(pdfio_stream_t *st) PDFIO_INTERNAL;
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extern bool _pdfioStringIsAllocated(pdfio_file_t *pdf, const char *s) PDFIO_INTERNAL;
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extern bool _pdfioTokenRead(pdfio_file_t *pdf, char *buffer, size_t bufsize, _pdfio_tpeek_cb_t peek_cb, _pdfio_tconsume_cb_t consume_cb, void *data);
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extern _pdfio_value_t *_pdfioValueCopy(pdfio_file_t *pdfdst, _pdfio_value_t *vdst, pdfio_file_t *pdfsrc, _pdfio_value_t *vsrc) PDFIO_INTERNAL;
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extern void _pdfioValueDelete(_pdfio_value_t *v) PDFIO_INTERNAL;
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extern bool _pdfioValueWrite(pdfio_file_t *pdf, _pdfio_value_t *v) PDFIO_INTERNAL;
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#endif // !PDFIO_PRIVATE_H
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