// // Private header file for PDFio. // // Copyright © 2021-2023 by Michael R Sweet. // // Licensed under Apache License v2.0. See the file "LICENSE" for more // information. // #ifndef PDFIO_PRIVATE_H # define PDFIO_PRIVATE_H # ifdef _WIN32 # define _CRT_SECURE_NO_WARNINGS // Disable bogus VS warnings/errors... # endif // _WIN32 # include "pdfio.h" # include # include # include # include # include # include # include # ifdef _WIN32 # include # include # include // GetTempPathA # define access _access // Map standard POSIX/C99 names # define close _close # define fileno _fileno # define lseek _lseek # define mkdir(d,p) _mkdir(d) # define open _open # define read _read # define rmdir _rmdir # define snprintf _snprintf # define strdup _strdup # define unlink _unlink # define vsnprintf _vsnprintf # define write _write # define F_OK 00 // POSIX parameters/flags # define W_OK 02 # define R_OK 04 # define O_RDONLY _O_RDONLY // Map standard POSIX open flags # define O_WRONLY _O_WRONLY # define O_CREAT _O_CREAT # define O_TRUNC _O_TRUNC # define O_BINARY _O_BINARY # else // !_WIN32 # include # define O_BINARY 0 // Map Windows-specific open flag # endif // _WIN32 # include // // Visibility and other annotations... // # if defined(__has_extension) || defined(__GNUC__) # define _PDFIO_INTERNAL __attribute__ ((visibility("hidden"))) # define _PDFIO_PRIVATE __attribute__ ((visibility("default"))) # define _PDFIO_NONNULL(...) __attribute__ ((nonnull(__VA_ARGS__))) # define _PDFIO_NORETURN __attribute__ ((noreturn)) # else # define _PDFIO_INTERNAL # define _PDFIO_PRIVATE # define _PDFIO_NONNULL(...) # define _PDFIO_NORETURN # endif // __has_extension || __GNUC__ // // Debug macro... // # ifdef DEBUG # define PDFIO_DEBUG(...) fprintf(stderr, __VA_ARGS__) # define PDFIO_DEBUG_ARRAY(array) _pdfioArrayDebug(array, stderr) # define PDFIO_DEBUG_DICT(dict) _pdfioDictDebug(dict, stderr) # define PDFIO_DEBUG_VALUE(value) _pdfioValueDebug(value, stderr) # else # define PDFIO_DEBUG(...) # define PDFIO_DEBUG_ARRAY(array) # define PDFIO_DEBUG_DICT(dict) # define PDFIO_DEBUG_VALUE(value) # endif // DEBUG // // Types and constants... // # define PDFIO_MAX_DEPTH 32 // Maximum nesting depth for values typedef enum _pdfio_mode_e // Read/write mode { _PDFIO_MODE_READ, // Read a PDF file _PDFIO_MODE_WRITE // Write a PDF file } _pdfio_mode_t; typedef enum _pdfio_predictor_e // PNG predictor constants { _PDFIO_PREDICTOR_NONE = 1, // No predictor (default) _PDFIO_PREDICTOR_TIFF2 = 2, // TIFF2 predictor (???) _PDFIO_PREDICTOR_PNG_NONE = 10, // PNG None predictor (same as `_PDFIO_PREDICTOR_NONE`) _PDFIO_PREDICTOR_PNG_SUB = 11, // PNG Sub predictor _PDFIO_PREDICTOR_PNG_UP = 12, // PNG Up predictor _PDFIO_PREDICTOR_PNG_AVERAGE = 13, // PNG Average predictor _PDFIO_PREDICTOR_PNG_PAETH = 14, // PNG Paeth predictor _PDFIO_PREDICTOR_PNG_AUTO = 15 // PNG "auto" predictor (currently mapped to Paeth) } _pdfio_predictor_t; typedef ssize_t (*_pdfio_tconsume_cb_t)(void *data, size_t bytes); typedef ssize_t (*_pdfio_tpeek_cb_t)(void *data, void *buffer, size_t bytes); typedef struct _pdfio_token_s // Token buffer/stack { pdfio_file_t *pdf; // PDF file _pdfio_tconsume_cb_t consume_cb; // Consume callback _pdfio_tpeek_cb_t peek_cb; // Peek callback void *cb_data; // Callback data unsigned char buffer[256], // Buffer *bufptr, // Pointer into buffer *bufend; // Last valid byte in buffer size_t num_tokens; // Number of tokens in stack char *tokens[4]; // Token stack } _pdfio_token_t; typedef struct _pdfio_value_s // Value structure { pdfio_valtype_t type; // Type of value union { pdfio_array_t *array; // Array value struct { unsigned char *data; // Data size_t datalen; // Length } binary; // Binary ("Hex String") data bool boolean; // Boolean value time_t date; // Date/time value pdfio_dict_t *dict; // Dictionary value struct { size_t number; // Object number unsigned short generation; // Generation number } indirect; // Indirect object reference const char *name; // Name value double number; // Number value const char *string; // String value } value; // Value union } _pdfio_value_t; typedef struct _pdfio_aes_s // AES encryption state { size_t round_size; // Size of round key uint8_t round_key[240], // Round key iv[16]; // Initialization vector } _pdfio_aes_t; typedef struct _pdfio_md5_s // MD5 hash state { uint32_t count[2]; // Message length in bits, lsw first uint32_t abcd[4]; // Digest buffer uint8_t buf[64]; // Accumulate block } _pdfio_md5_t; typedef struct _pdfio_rc4_s // RC4 encryption state { uint8_t sbox[256]; // S boxes for encryption uint8_t i, j; // Current indices into S boxes } _pdfio_rc4_t; typedef struct _pdfio_sha265_s // SHA-256 hash state { uint32_t Intermediate_Hash[8]; // Message Digest uint32_t Length_High; // Message length in bits uint32_t Length_Low; // Message length in bits int Message_Block_Index; // Message_Block array index uint8_t Message_Block[64]; // 512-bit message blocks int Computed; // Is the hash computed? int Corrupted; // Cumulative corruption code } _pdfio_sha256_t; typedef union _pdfio_crypto_ctx_u // Cryptographic contexts { _pdfio_aes_t aes; // AES-128/256 context _pdfio_rc4_t rc4; // RC4-40/128 context } _pdfio_crypto_ctx_t; typedef size_t (*_pdfio_crypto_cb_t)(_pdfio_crypto_ctx_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len); struct _pdfio_array_s { pdfio_file_t *pdf; // PDF file size_t num_values, // Number of values in use alloc_values; // Number of allocated values _pdfio_value_t *values; // Array of values }; typedef struct _pdfio_pair_s // Key/value pair { const char *key; // Key string _pdfio_value_t value; // Value } _pdfio_pair_t; struct _pdfio_dict_s // Dictionary { pdfio_file_t *pdf; // PDF file size_t num_pairs, // Number of pairs in use alloc_pairs; // Number of allocated pairs _pdfio_pair_t *pairs; // Array of pairs }; typedef struct _pdfio_objmap_s // PDF object map { pdfio_obj_t *obj; // Object for this file pdfio_file_t *src_pdf; // Source PDF file size_t src_number; // Source object number } _pdfio_objmap_t; struct _pdfio_file_s // PDF file structure { char *filename; // Filename char *version; // Version number pdfio_rect_t media_box, // Default MediaBox value crop_box; // Default CropBox value _pdfio_mode_t mode; // Read/write mode pdfio_output_cb_t output_cb; // Output callback void *output_ctx; // Context for output callback pdfio_error_cb_t error_cb; // Error callback void *error_data; // Data for error callback pdfio_encryption_t encryption; // Encryption mode pdfio_permission_t permissions; // Access permissions (encrypted PDF files) uint8_t file_key[16], // File encryption key owner_key[32], // Owner encryption key user_key[32]; // User encryption key size_t file_keylen, // Length of file encryption key owner_keylen, // Length of owner encryption key user_keylen; // Length of user encryption key // Active file data int fd; // File descriptor char buffer[8192], // Read/write buffer *bufptr, // Pointer into buffer *bufend; // End of buffer off_t bufpos; // Position in file for start of buffer pdfio_dict_t *trailer_dict; // Trailer dictionary pdfio_obj_t *root_obj; // Root object/dictionary pdfio_obj_t *info_obj; // Information object pdfio_obj_t *pages_obj; // Root pages object pdfio_obj_t *encrypt_obj; // De/Encryption object/dictionary pdfio_obj_t *cp1252_obj, // CP1252 font encoding object *unicode_obj; // Unicode font encoding object pdfio_array_t *id_array; // ID array // Allocated data elements size_t num_arrays, // Number of arrays alloc_arrays; // Allocated arrays pdfio_array_t **arrays; // Arrays size_t num_dicts, // Number of dictionaries alloc_dicts; // Allocated dictionaries pdfio_dict_t **dicts; // Dictionaries size_t num_objs, // Number of objects alloc_objs; // Allocated objects pdfio_obj_t **objs, // Objects *current_obj; // Current object being written/read size_t num_objmaps, // Number of object maps alloc_objmaps; // Allocated object maps _pdfio_objmap_t *objmaps; // Object maps size_t num_pages, // Number of pages alloc_pages; // Allocated pages pdfio_obj_t **pages; // Pages size_t num_strings, // Number of strings alloc_strings; // Allocated strings char **strings; // Nul-terminated strings }; struct _pdfio_obj_s // Object { pdfio_file_t *pdf; // PDF file size_t number; // Number unsigned short generation; // Generation off_t offset, // Offset to object in file length_offset, // Offset to /Length in object dict stream_offset; // Offset to start of stream in file size_t stream_length; // Length of stream, if any _pdfio_value_t value; // Dictionary/number/etc. value pdfio_stream_t *stream; // Open stream, if any }; struct _pdfio_stream_s // Stream { pdfio_file_t *pdf; // PDF file pdfio_obj_t *obj; // Object pdfio_obj_t *length_obj; // Length object, if any pdfio_filter_t filter; // Compression/decompression filter size_t remaining; // Remaining bytes in stream char buffer[8192], // Read/write buffer *bufptr, // Current position in buffer *bufend; // End of buffer z_stream flate; // Flate filter state _pdfio_predictor_t predictor; // Predictor function, if any size_t pbpixel, // Size of a pixel in bytes pbsize; // Predictor buffer size, if any unsigned char cbuffer[4096], // Compressed data buffer *prbuffer, // Raw buffer (previous line), as needed *psbuffer; // PNG filter buffer, as needed _pdfio_crypto_cb_t crypto_cb; // Encryption/descryption callback, if any _pdfio_crypto_ctx_t crypto_ctx; // Cryptographic context }; // // Functions... // extern void _pdfioArrayDebug(pdfio_array_t *a, FILE *fp) _PDFIO_INTERNAL; extern void _pdfioArrayDelete(pdfio_array_t *a) _PDFIO_INTERNAL; extern _pdfio_value_t *_pdfioArrayGetValue(pdfio_array_t *a, size_t n) _PDFIO_INTERNAL; extern pdfio_array_t *_pdfioArrayRead(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_token_t *ts, size_t depth) _PDFIO_INTERNAL; extern bool _pdfioArrayWrite(pdfio_array_t *a, pdfio_obj_t *obj) _PDFIO_INTERNAL; extern void _pdfioCryptoAESInit(_pdfio_aes_t *ctx, const uint8_t *key, size_t keylen, const uint8_t *iv) _PDFIO_INTERNAL; extern size_t _pdfioCryptoAESDecrypt(_pdfio_aes_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len) _PDFIO_INTERNAL; extern size_t _pdfioCryptoAESEncrypt(_pdfio_aes_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len) _PDFIO_INTERNAL; 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; extern void _pdfioCryptoMakeRandom(uint8_t *buffer, size_t bytes) _PDFIO_INTERNAL; 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; 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; extern void _pdfioCryptoMD5Append(_pdfio_md5_t *pms, const uint8_t *data, size_t nbytes) _PDFIO_INTERNAL; extern void _pdfioCryptoMD5Finish(_pdfio_md5_t *pms, uint8_t digest[16]) _PDFIO_INTERNAL; extern void _pdfioCryptoMD5Init(_pdfio_md5_t *pms) _PDFIO_INTERNAL; extern void _pdfioCryptoRC4Init(_pdfio_rc4_t *ctx, const uint8_t *key, size_t keylen) _PDFIO_INTERNAL; extern size_t _pdfioCryptoRC4Crypt(_pdfio_rc4_t *ctx, uint8_t *outbuffer, const uint8_t *inbuffer, size_t len) _PDFIO_INTERNAL; extern void _pdfioCryptoSHA256Append(_pdfio_sha256_t *, const uint8_t *bytes, size_t bytecount) _PDFIO_INTERNAL; extern void _pdfioCryptoSHA256Init(_pdfio_sha256_t *ctx) _PDFIO_INTERNAL; extern void _pdfioCryptoSHA256Finish(_pdfio_sha256_t *ctx, uint8_t *Message_Digest) _PDFIO_INTERNAL; extern bool _pdfioCryptoUnlock(pdfio_file_t *pdf, pdfio_password_cb_t password_cb, void *password_data) _PDFIO_INTERNAL; extern void _pdfioDictClear(pdfio_dict_t *dict, const char *key) _PDFIO_INTERNAL; extern void _pdfioDictDebug(pdfio_dict_t *dict, FILE *fp) _PDFIO_INTERNAL; extern void _pdfioDictDelete(pdfio_dict_t *dict) _PDFIO_INTERNAL; extern _pdfio_value_t *_pdfioDictGetValue(pdfio_dict_t *dict, const char *key) _PDFIO_INTERNAL; extern pdfio_dict_t *_pdfioDictRead(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_token_t *ts, size_t depth) _PDFIO_INTERNAL; extern bool _pdfioDictSetValue(pdfio_dict_t *dict, const char *key, _pdfio_value_t *value) _PDFIO_INTERNAL; extern bool _pdfioDictWrite(pdfio_dict_t *dict, pdfio_obj_t *obj, off_t *length) _PDFIO_INTERNAL; extern bool _pdfioFileAddMappedObj(pdfio_file_t *pdf, pdfio_obj_t *dst_obj, pdfio_obj_t *src_obj) _PDFIO_INTERNAL; extern bool _pdfioFileAddPage(pdfio_file_t *pdf, pdfio_obj_t *obj) _PDFIO_INTERNAL; extern bool _pdfioFileConsume(pdfio_file_t *pdf, size_t bytes) _PDFIO_INTERNAL; extern pdfio_obj_t *_pdfioFileCreateObj(pdfio_file_t *pdf, pdfio_file_t *srcpdf, _pdfio_value_t *value) _PDFIO_INTERNAL; extern bool _pdfioFileDefaultError(pdfio_file_t *pdf, const char *message, void *data) _PDFIO_INTERNAL; extern bool _pdfioFileError(pdfio_file_t *pdf, const char *format, ...) _PDFIO_FORMAT(2,3) _PDFIO_INTERNAL; extern pdfio_obj_t *_pdfioFileFindMappedObj(pdfio_file_t *pdf, pdfio_file_t *src_pdf, size_t src_number) _PDFIO_INTERNAL; extern bool _pdfioFileFlush(pdfio_file_t *pdf) _PDFIO_INTERNAL; extern int _pdfioFileGetChar(pdfio_file_t *pdf) _PDFIO_INTERNAL; extern bool _pdfioFileGets(pdfio_file_t *pdf, char *buffer, size_t bufsize) _PDFIO_INTERNAL; extern ssize_t _pdfioFilePeek(pdfio_file_t *pdf, void *buffer, size_t bytes) _PDFIO_INTERNAL; extern bool _pdfioFilePrintf(pdfio_file_t *pdf, const char *format, ...) _PDFIO_FORMAT(2,3) _PDFIO_INTERNAL; extern bool _pdfioFilePuts(pdfio_file_t *pdf, const char *s) _PDFIO_INTERNAL; extern ssize_t _pdfioFileRead(pdfio_file_t *pdf, void *buffer, size_t bytes) _PDFIO_INTERNAL; extern off_t _pdfioFileSeek(pdfio_file_t *pdf, off_t offset, int whence) _PDFIO_INTERNAL; extern off_t _pdfioFileTell(pdfio_file_t *pdf) _PDFIO_INTERNAL; extern bool _pdfioFileWrite(pdfio_file_t *pdf, const void *buffer, size_t bytes) _PDFIO_INTERNAL; extern void _pdfioObjDelete(pdfio_obj_t *obj) _PDFIO_INTERNAL; extern bool _pdfioObjLoad(pdfio_obj_t *obj) _PDFIO_INTERNAL; extern pdfio_stream_t *_pdfioStreamCreate(pdfio_obj_t *obj, pdfio_obj_t *length_obj, pdfio_filter_t compression) _PDFIO_INTERNAL; extern pdfio_stream_t *_pdfioStreamOpen(pdfio_obj_t *obj, bool decode) _PDFIO_INTERNAL; extern bool _pdfioStringIsAllocated(pdfio_file_t *pdf, const char *s) _PDFIO_INTERNAL; extern void _pdfioTokenClear(_pdfio_token_t *tb) _PDFIO_INTERNAL; extern void _pdfioTokenFlush(_pdfio_token_t *tb) _PDFIO_INTERNAL; extern bool _pdfioTokenGet(_pdfio_token_t *tb, char *buffer, size_t bufsize) _PDFIO_INTERNAL; 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); extern void _pdfioTokenPush(_pdfio_token_t *tb, const char *token) _PDFIO_INTERNAL; extern bool _pdfioTokenRead(_pdfio_token_t *tb, char *buffer, size_t bufsize); extern _pdfio_value_t *_pdfioValueCopy(pdfio_file_t *pdfdst, _pdfio_value_t *vdst, pdfio_file_t *pdfsrc, _pdfio_value_t *vsrc) _PDFIO_INTERNAL; extern void _pdfioValueDebug(_pdfio_value_t *v, FILE *fp) _PDFIO_INTERNAL; extern void _pdfioValueDelete(_pdfio_value_t *v) _PDFIO_INTERNAL; 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; extern bool _pdfioValueWrite(pdfio_file_t *pdf, pdfio_obj_t *obj, _pdfio_value_t *v, off_t *length) _PDFIO_INTERNAL; #endif // !PDFIO_PRIVATE_H