mirror of
https://github.com/michaelrsweet/pdfio.git
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397 lines
16 KiB
C
397 lines
16 KiB
C
//
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// Private header file for PDFio.
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//
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// Copyright © 2021-2023 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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# ifdef _WIN32
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# define _CRT_SECURE_NO_WARNINGS // Disable bogus VS warnings/errors...
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# endif // _WIN32
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# include "pdfio.h"
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# include <stdarg.h>
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# include <stdint.h>
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# include <string.h>
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# include <ctype.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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# ifdef _WIN32
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# include <io.h>
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# include <direct.h>
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# include <windows.h> // GetTempPathA
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# define access _access // Map standard POSIX/C99 names
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# define close _close
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# define fileno _fileno
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# define lseek _lseek
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# define mkdir(d,p) _mkdir(d)
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# define open _open
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# define read _read
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# define rmdir _rmdir
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# define snprintf _snprintf
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# define strdup _strdup
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# define unlink _unlink
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# define vsnprintf _vsnprintf
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# define write _write
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# define F_OK 00 // POSIX parameters/flags
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# define W_OK 02
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# define R_OK 04
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# define O_RDONLY _O_RDONLY // Map standard POSIX open flags
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# define O_WRONLY _O_WRONLY
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# define O_CREAT _O_CREAT
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# define O_TRUNC _O_TRUNC
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# define O_BINARY _O_BINARY
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# else // !_WIN32
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# include <unistd.h>
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# define O_BINARY 0 // Map Windows-specific open flag
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# endif // _WIN32
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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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# define PDFIO_DEBUG_ARRAY(array) _pdfioArrayDebug(array, stderr)
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# define PDFIO_DEBUG_DICT(dict) _pdfioDictDebug(dict, stderr)
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# define PDFIO_DEBUG_VALUE(value) _pdfioValueDebug(value, stderr)
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# else
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# define PDFIO_DEBUG(...)
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# define PDFIO_DEBUG_ARRAY(array)
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# define PDFIO_DEBUG_DICT(dict)
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# define PDFIO_DEBUG_VALUE(value)
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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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# define PDFIO_MAX_DEPTH 32 // Maximum nesting depth for values
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typedef void (*_pdfio_extfree_t)(void *);
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// Extension data free function
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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 enum _pdfio_predictor_e // PNG predictor constants
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{
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_PDFIO_PREDICTOR_NONE = 1, // No predictor (default)
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_PDFIO_PREDICTOR_TIFF2 = 2, // TIFF2 predictor (???)
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_PDFIO_PREDICTOR_PNG_NONE = 10, // PNG None predictor (same as `_PDFIO_PREDICTOR_NONE`)
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_PDFIO_PREDICTOR_PNG_SUB = 11, // PNG Sub predictor
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_PDFIO_PREDICTOR_PNG_UP = 12, // PNG Up predictor
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_PDFIO_PREDICTOR_PNG_AVERAGE = 13, // PNG Average predictor
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_PDFIO_PREDICTOR_PNG_PAETH = 14, // PNG Paeth predictor
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_PDFIO_PREDICTOR_PNG_AUTO = 15 // PNG "auto" predictor (currently mapped to Paeth)
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} _pdfio_predictor_t;
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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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typedef struct _pdfio_token_s // Token buffer/stack
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{
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pdfio_file_t *pdf; // PDF file
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_pdfio_tconsume_cb_t consume_cb; // Consume callback
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_pdfio_tpeek_cb_t peek_cb; // Peek callback
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void *cb_data; // Callback data
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unsigned char buffer[256], // Buffer
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*bufptr, // Pointer into buffer
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*bufend; // Last valid byte in buffer
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size_t num_tokens; // Number of tokens in stack
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char *tokens[4]; // Token stack
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} _pdfio_token_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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struct
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{
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size_t number; // Object number
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unsigned short generation; // Generation number
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} indirect; // Indirect object reference
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const char *name; // Name value
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double 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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typedef struct _pdfio_aes_s // AES encryption state
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{
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size_t round_size; // Size of round key
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uint8_t round_key[240], // Round key
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iv[16]; // Initialization vector
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} _pdfio_aes_t;
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typedef struct _pdfio_md5_s // MD5 hash state
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{
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uint32_t count[2]; // Message length in bits, lsw first
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uint32_t abcd[4]; // Digest buffer
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uint8_t buf[64]; // Accumulate block
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} _pdfio_md5_t;
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typedef struct _pdfio_rc4_s // RC4 encryption state
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{
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uint8_t sbox[256]; // S boxes for encryption
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uint8_t i, j; // Current indices into S boxes
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} _pdfio_rc4_t;
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typedef struct _pdfio_sha265_s // SHA-256 hash state
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{
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uint32_t Intermediate_Hash[8]; // Message Digest
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uint32_t Length_High; // Message length in bits
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uint32_t Length_Low; // Message length in bits
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int Message_Block_Index; // Message_Block array index
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uint8_t Message_Block[64]; // 512-bit message blocks
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int Computed; // Is the hash computed?
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int Corrupted; // Cumulative corruption code
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} _pdfio_sha256_t;
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typedef union _pdfio_crypto_ctx_u // Cryptographic contexts
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{
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_pdfio_aes_t aes; // AES-128/256 context
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_pdfio_rc4_t rc4; // RC4-40/128 context
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} _pdfio_crypto_ctx_t;
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typedef size_t (*_pdfio_crypto_cb_t)(_pdfio_crypto_ctx_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len);
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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 // Dictionary
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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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typedef struct _pdfio_objmap_s // PDF object map
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{
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pdfio_obj_t *obj; // Object for this file
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pdfio_file_t *src_pdf; // Source PDF file
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size_t src_number; // Source object number
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} _pdfio_objmap_t;
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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_rect_t media_box, // Default MediaBox value
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crop_box; // Default CropBox value
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_pdfio_mode_t mode; // Read/write mode
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pdfio_output_cb_t output_cb; // Output callback
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void *output_ctx; // Context for output callback
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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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pdfio_encryption_t encryption; // Encryption mode
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pdfio_permission_t permissions; // Access permissions (encrypted PDF files)
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uint8_t file_key[16], // File encryption key
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owner_key[32], // Owner encryption key
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user_key[32]; // User encryption key
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size_t file_keylen, // Length of file encryption key
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owner_keylen, // Length of owner encryption key
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user_keylen; // Length of user encryption key
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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_dict; // Trailer dictionary
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pdfio_obj_t *root_obj; // Root object/dictionary
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pdfio_obj_t *info_obj; // Information object
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pdfio_obj_t *pages_obj; // Root pages object
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pdfio_obj_t *encrypt_obj; // De/Encryption object/dictionary
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pdfio_obj_t *cp1252_obj, // CP1252 font encoding object
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*unicode_obj; // Unicode font encoding object
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pdfio_array_t *id_array; // ID array
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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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*current_obj; // Current object being written/read
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size_t num_objmaps, // Number of object maps
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alloc_objmaps; // Allocated object maps
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_pdfio_objmap_t *objmaps; // Object maps
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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_value_t value; // Dictionary/number/etc. value
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pdfio_stream_t *stream; // Open stream, if any
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void *data; // Extension data, if any
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_pdfio_extfree_t datafree; // Free callback for extension data
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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_obj_t *length_obj; // Length object, if any
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pdfio_filter_t filter; // Compression/decompression filter
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size_t remaining; // Remaining bytes in stream
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char buffer[8192], // Read/write buffer
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*bufptr, // Current position in buffer
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*bufend; // End of buffer
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z_stream flate; // Flate filter state
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_pdfio_predictor_t predictor; // Predictor function, if any
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size_t pbpixel, // Size of a pixel in bytes
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pbsize; // Predictor buffer size, if any
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unsigned char cbuffer[4096], // Compressed data buffer
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*prbuffer, // Raw buffer (previous line), as needed
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*psbuffer; // PNG filter buffer, as needed
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_pdfio_crypto_cb_t crypto_cb; // Encryption/descryption callback, if any
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_pdfio_crypto_ctx_t crypto_ctx; // Cryptographic context
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};
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//
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// Functions...
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//
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extern void _pdfioArrayDebug(pdfio_array_t *a, FILE *fp) _PDFIO_INTERNAL;
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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 pdfio_array_t *_pdfioArrayRead(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_token_t *ts, size_t depth) _PDFIO_INTERNAL;
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extern bool _pdfioArrayWrite(pdfio_array_t *a, pdfio_obj_t *obj) _PDFIO_INTERNAL;
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extern void _pdfioCryptoAESInit(_pdfio_aes_t *ctx, const uint8_t *key, size_t keylen, const uint8_t *iv) _PDFIO_INTERNAL;
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extern size_t _pdfioCryptoAESDecrypt(_pdfio_aes_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len) _PDFIO_INTERNAL;
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extern size_t _pdfioCryptoAESEncrypt(_pdfio_aes_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len) _PDFIO_INTERNAL;
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extern bool _pdfioCryptoLock(pdfio_file_t *pdf, pdfio_permission_t permissions, pdfio_encryption_t encryption, const char *owner_password, const char *user_password) _PDFIO_INTERNAL;
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extern void _pdfioCryptoMakeRandom(uint8_t *buffer, size_t bytes) _PDFIO_INTERNAL;
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extern _pdfio_crypto_cb_t _pdfioCryptoMakeReader(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_crypto_ctx_t *ctx, uint8_t *iv, size_t *ivlen) _PDFIO_INTERNAL;
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extern _pdfio_crypto_cb_t _pdfioCryptoMakeWriter(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_crypto_ctx_t *ctx, uint8_t *iv, size_t *ivlen) _PDFIO_INTERNAL;
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extern void _pdfioCryptoMD5Append(_pdfio_md5_t *pms, const uint8_t *data, size_t nbytes) _PDFIO_INTERNAL;
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extern void _pdfioCryptoMD5Finish(_pdfio_md5_t *pms, uint8_t digest[16]) _PDFIO_INTERNAL;
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extern void _pdfioCryptoMD5Init(_pdfio_md5_t *pms) _PDFIO_INTERNAL;
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extern void _pdfioCryptoRC4Init(_pdfio_rc4_t *ctx, const uint8_t *key, size_t keylen) _PDFIO_INTERNAL;
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extern size_t _pdfioCryptoRC4Crypt(_pdfio_rc4_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len) _PDFIO_INTERNAL;
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extern void _pdfioCryptoSHA256Append(_pdfio_sha256_t *, const uint8_t *bytes, size_t bytecount) _PDFIO_INTERNAL;
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extern void _pdfioCryptoSHA256Init(_pdfio_sha256_t *ctx) _PDFIO_INTERNAL;
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extern void _pdfioCryptoSHA256Finish(_pdfio_sha256_t *ctx, uint8_t *Message_Digest) _PDFIO_INTERNAL;
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extern bool _pdfioCryptoUnlock(pdfio_file_t *pdf, pdfio_password_cb_t password_cb, void *password_data) _PDFIO_INTERNAL;
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extern void _pdfioDictClear(pdfio_dict_t *dict, const char *key) _PDFIO_INTERNAL;
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extern void _pdfioDictDebug(pdfio_dict_t *dict, FILE *fp) _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_obj_t *obj, _pdfio_token_t *ts, size_t depth) _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, pdfio_obj_t *obj, off_t *length) _PDFIO_INTERNAL;
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extern bool _pdfioFileAddMappedObj(pdfio_file_t *pdf, pdfio_obj_t *dst_obj, pdfio_obj_t *src_obj) _PDFIO_INTERNAL;
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extern bool _pdfioFileAddPage(pdfio_file_t *pdf, pdfio_obj_t *obj) _PDFIO_INTERNAL;
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extern bool _pdfioFileConsume(pdfio_file_t *pdf, size_t bytes) _PDFIO_INTERNAL;
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extern pdfio_obj_t *_pdfioFileCreateObj(pdfio_file_t *pdf, pdfio_file_t *srcpdf, _pdfio_value_t *value) _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 pdfio_obj_t *_pdfioFileFindMappedObj(pdfio_file_t *pdf, pdfio_file_t *src_pdf, size_t src_number) _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 _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 *_pdfioObjGetExtension(pdfio_obj_t *obj) _PDFIO_INTERNAL;
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extern bool _pdfioObjLoad(pdfio_obj_t *obj) _PDFIO_INTERNAL;
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extern void _pdfioObjSetExtension(pdfio_obj_t *obj, void *data, _pdfio_extfree_t datafree) _PDFIO_INTERNAL;
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extern pdfio_stream_t *_pdfioStreamCreate(pdfio_obj_t *obj, pdfio_obj_t *length_obj, pdfio_filter_t compression) _PDFIO_INTERNAL;
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extern pdfio_stream_t *_pdfioStreamOpen(pdfio_obj_t *obj, bool decode) _PDFIO_INTERNAL;
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extern bool _pdfioStringIsAllocated(pdfio_file_t *pdf, const char *s) _PDFIO_INTERNAL;
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extern void _pdfioTokenClear(_pdfio_token_t *tb) _PDFIO_INTERNAL;
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extern void _pdfioTokenFlush(_pdfio_token_t *tb) _PDFIO_INTERNAL;
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extern bool _pdfioTokenGet(_pdfio_token_t *tb, char *buffer, size_t bufsize) _PDFIO_INTERNAL;
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extern void _pdfioTokenInit(_pdfio_token_t *tb, pdfio_file_t *pdf, _pdfio_tconsume_cb_t consume_cb, _pdfio_tpeek_cb_t peek_cb, void *cb_data);
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extern void _pdfioTokenPush(_pdfio_token_t *tb, const char *token) _PDFIO_INTERNAL;
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extern bool _pdfioTokenRead(_pdfio_token_t *tb, char *buffer, size_t bufsize);
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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 _pdfioValueDebug(_pdfio_value_t *v, FILE *fp) _PDFIO_INTERNAL;
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extern void _pdfioValueDelete(_pdfio_value_t *v) _PDFIO_INTERNAL;
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extern _pdfio_value_t *_pdfioValueRead(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_token_t *ts, _pdfio_value_t *v, size_t depth) _PDFIO_INTERNAL;
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extern bool _pdfioValueWrite(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_value_t *v, off_t *length) _PDFIO_INTERNAL;
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#endif // !PDFIO_PRIVATE_H
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