159 lines
7.9 KiB
C
159 lines
7.9 KiB
C
/*****************************************************************************/
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/* pklib.h Copyright (c) Ladislav Zezula 2003 */
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/*---------------------------------------------------------------------------*/
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/* Header file for PKWARE Data Compression Library */
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/*---------------------------------------------------------------------------*/
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/* Date Ver Who Comment */
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/* -------- ---- --- ------- */
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/* 31.03.03 1.00 Lad The first version of pkware.h */
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/*****************************************************************************/
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#ifndef __PKLIB_H__
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#define __PKLIB_H__
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//-----------------------------------------------------------------------------
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// Defines
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#define CMP_BINARY 0 // Binary compression
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#define CMP_ASCII 1 // Ascii compression
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#define CMP_NO_ERROR 0
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#define CMP_INVALID_DICTSIZE 1
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#define CMP_INVALID_MODE 2
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#define CMP_BAD_DATA 3
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#define CMP_ABORT 4
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#define CMP_IMPLODE_DICT_SIZE1 1024 // Dictionary size of 1024
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#define CMP_IMPLODE_DICT_SIZE2 2048 // Dictionary size of 2048
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#define CMP_IMPLODE_DICT_SIZE3 4096 // Dictionary size of 4096
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//-----------------------------------------------------------------------------
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// Define calling convention
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#ifndef PKEXPORT
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#ifdef WIN32
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#define PKEXPORT __cdecl // Use for normal __cdecl calling
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#else
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#define PKEXPORT
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#endif
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#endif
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//-----------------------------------------------------------------------------
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// Internal structures
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// Compression structure
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typedef struct
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{
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unsigned int distance; // 0000: Backward distance of the currently found repetition, decreased by 1
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unsigned int out_bytes; // 0004: # bytes available in out_buff
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unsigned int out_bits; // 0008: # of bits available in the last out byte
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unsigned int dsize_bits; // 000C: Number of bits needed for dictionary size. 4 = 0x400, 5 = 0x800, 6 = 0x1000
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unsigned int dsize_mask; // 0010: Bit mask for dictionary. 0x0F = 0x400, 0x1F = 0x800, 0x3F = 0x1000
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unsigned int ctype; // 0014: Compression type (CMP_ASCII or CMP_BINARY)
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unsigned int dsize_bytes; // 0018: Dictionary size in bytes
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unsigned char dist_bits[0x40]; // 001C: Distance bits
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unsigned char dist_codes[0x40]; // 005C: Distance codes
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unsigned char nChBits[0x306]; // 009C: Table of literal bit lengths to be put to the output stream
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unsigned short nChCodes[0x306]; // 03A2: Table of literal codes to be put to the output stream
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unsigned short offs09AE; // 09AE:
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void * param; // 09B0: User parameter
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unsigned int (*read_buf)(char *buf, unsigned int *size, void *param); // 9B4
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void (*write_buf)(char *buf, unsigned int *size, void *param); // 9B8
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unsigned short offs09BC[0x204]; // 09BC:
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unsigned long offs0DC4; // 0DC4:
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unsigned short phash_to_index[0x900]; // 0DC8: Array of indexes (one for each PAIR_HASH) to the "pair_hash_offsets" table
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unsigned short phash_to_index_end; // 1FC8: End marker for "phash_to_index" table
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char out_buff[0x802]; // 1FCA: Compressed data
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unsigned char work_buff[0x2204]; // 27CC: Work buffer
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// + DICT_OFFSET => Dictionary
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// + UNCMP_OFFSET => Uncompressed data
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unsigned short phash_offs[0x2204]; // 49D0: Table of offsets for each PAIR_HASH
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} TCmpStruct;
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#define CMP_BUFFER_SIZE sizeof(TCmpStruct) // Size of compression structure.
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// Defined as 36312 in pkware header file
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// Decompression structure
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typedef struct
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{
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unsigned long offs0000; // 0000
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unsigned long ctype; // 0004: Compression type (CMP_BINARY or CMP_ASCII)
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unsigned long outputPos; // 0008: Position in output buffer
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unsigned long dsize_bits; // 000C: Dict size (4, 5, 6 for 0x400, 0x800, 0x1000)
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unsigned long dsize_mask; // 0010: Dict size bitmask (0x0F, 0x1F, 0x3F for 0x400, 0x800, 0x1000)
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unsigned long bit_buff; // 0014: 16-bit buffer for processing input data
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unsigned long extra_bits; // 0018: Number of extra (above 8) bits in bit buffer
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unsigned int in_pos; // 001C: Position in in_buff
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unsigned long in_bytes; // 0020: Number of bytes in input buffer
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void * param; // 0024: Custom parameter
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unsigned int (*read_buf)(char *buf, unsigned int *size, void *param); // Pointer to function that reads data from the input stream
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void (*write_buf)(char *buf, unsigned int *size, void *param);// Pointer to function that writes data to the output stream
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unsigned char out_buff[0x2204]; // 0030: Output circle buffer.
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// 0x0000 - 0x0FFF: Previous uncompressed data, kept for repetitions
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// 0x1000 - 0x1FFF: Currently decompressed data
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// 0x2000 - 0x2203: Reserve space for the longest possible repetition
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unsigned char in_buff[0x800]; // 2234: Buffer for data to be decompressed
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unsigned char DistPosCodes[0x100]; // 2A34: Table of distance position codes
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unsigned char LengthCodes[0x100]; // 2B34: Table of length codes
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unsigned char offs2C34[0x100]; // 2C34: Buffer for
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unsigned char offs2D34[0x100]; // 2D34: Buffer for
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unsigned char offs2E34[0x80]; // 2E34: Buffer for
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unsigned char offs2EB4[0x100]; // 2EB4: Buffer for
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unsigned char ChBitsAsc[0x100]; // 2FB4: Buffer for
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unsigned char DistBits[0x40]; // 30B4: Numbers of bytes to skip copied block length
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unsigned char LenBits[0x10]; // 30F4: Numbers of bits for skip copied block length
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unsigned char ExLenBits[0x10]; // 3104: Number of valid bits for copied block
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unsigned short LenBase[0x10]; // 3114: Buffer for
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} TDcmpStruct;
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#define EXP_BUFFER_SIZE sizeof(TDcmpStruct) // Size of decompression structure
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// Defined as 12596 in pkware headers
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//-----------------------------------------------------------------------------
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// Tables (in explode.c)
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extern unsigned char DistBits[0x40];
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extern unsigned char DistCode[0x40];
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extern unsigned char ExLenBits[0x10];
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extern unsigned short LenBase[0x10];
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extern unsigned char LenBits[0x10];
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extern unsigned char LenCode[0x10];
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extern unsigned char ChBitsAsc[0x100];
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extern unsigned short ChCodeAsc[0x100];
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//-----------------------------------------------------------------------------
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// Public functions
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#ifdef __cplusplus
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extern "C" {
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#endif
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unsigned int PKEXPORT implode(
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unsigned int (*read_buf)(char *buf, unsigned int *size, void *param),
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void (*write_buf)(char *buf, unsigned int *size, void *param),
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char *work_buf,
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void *param,
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unsigned int *type,
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unsigned int *dsize);
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unsigned int PKEXPORT explode(
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unsigned int (*read_buf)(char *buf, unsigned int *size, void *param),
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void (*write_buf)(char *buf, unsigned int *size, void *param),
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char *work_buf,
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void *param);
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// The original name "crc32" was changed to "crc32pk" due
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// to compatibility with zlib
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unsigned long PKEXPORT crc32_pklib(char *buffer, unsigned int *size, unsigned long *old_crc);
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#ifdef __cplusplus
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} // End of 'extern "C"' declaration
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#endif
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#endif // __PKLIB_H__
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