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/* This file is part of libmspack.
* (C) 2003-2010 Stuart Caie.
*
* libmspack is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License (LGPL) version 2.1
*
* For further details, see the file COPYING.LIB distributed with libmspack
*/
#ifndef MSPACK_KWAJ_H
#define MSPACK_KWAJ_H 1
#include "lzss.h"
/* generic KWAJ definitions */
#define kwajh_Signature1 (0x00)
#define kwajh_Signature2 (0x04)
#define kwajh_CompMethod (0x08)
#define kwajh_DataOffset (0x0a)
#define kwajh_Flags (0x0c)
#define kwajh_SIZEOF (0x0e)
/* KWAJ compression definitions */
struct mskwaj_compressor_p {
struct mskwaj_compressor base;
struct mspack_system *system;
/* todo */
int param[2]; /* !!! MATCH THIS TO NUM OF PARAMS IN MSPACK.H !!! */
int error;
};
/* KWAJ decompression definitions */
struct mskwaj_decompressor_p {
struct mskwaj_decompressor base;
struct mspack_system *system;
int error;
};
struct mskwajd_header_p {
struct mskwajd_header base;
struct mspack_file *fh;
};
/* input buffer size during decompression - not worth parameterising IMHO */
#define KWAJ_INPUT_SIZE (2048)
/* huffman codes that are 9 bits or less are decoded immediately */
#define KWAJ_TABLEBITS (9)
/* number of codes in each huffman table */
#define KWAJ_MATCHLEN1_SYMS (16)
#define KWAJ_MATCHLEN2_SYMS (16)
#define KWAJ_LITLEN_SYMS (32)
#define KWAJ_OFFSET_SYMS (64)
#define KWAJ_LITERAL_SYMS (256)
/* define decoding table sizes */
#define KWAJ_TABLESIZE (1 << KWAJ_TABLEBITS)
#if KWAJ_TABLESIZE < (KWAJ_MATCHLEN1_SYMS * 2)
# define KWAJ_MATCHLEN1_TBLSIZE (KWAJ_MATCHLEN1_SYMS * 4)
#else
# define KWAJ_MATCHLEN1_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_MATCHLEN1_SYMS * 2))
#endif
#if KWAJ_TABLESIZE < (KWAJ_MATCHLEN2_SYMS * 2)
# define KWAJ_MATCHLEN2_TBLSIZE (KWAJ_MATCHLEN2_SYMS * 4)
#else
# define KWAJ_MATCHLEN2_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_MATCHLEN2_SYMS * 2))
#endif
#if KWAJ_TABLESIZE < (KWAJ_LITLEN_SYMS * 2)
# define KWAJ_LITLEN_TBLSIZE (KWAJ_LITLEN_SYMS * 4)
#else
# define KWAJ_LITLEN_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_LITLEN_SYMS * 2))
#endif
#if KWAJ_TABLESIZE < (KWAJ_OFFSET_SYMS * 2)
# define KWAJ_OFFSET_TBLSIZE (KWAJ_OFFSET_SYMS * 4)
#else
# define KWAJ_OFFSET_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_OFFSET_SYMS * 2))
#endif
#if KWAJ_TABLESIZE < (KWAJ_LITERAL_SYMS * 2)
# define KWAJ_LITERAL_TBLSIZE (KWAJ_LITERAL_SYMS * 4)
#else
# define KWAJ_LITERAL_TBLSIZE (KWAJ_TABLESIZE + (KWAJ_LITERAL_SYMS * 2))
#endif
struct kwajd_stream {
/* I/O buffering */
struct mspack_system *sys;
struct mspack_file *input;
struct mspack_file *output;
unsigned char *i_ptr, *i_end;
unsigned int bit_buffer, bits_left;
int input_end;
/* huffman code lengths */
unsigned char MATCHLEN1_len [KWAJ_MATCHLEN1_SYMS];
unsigned char MATCHLEN2_len [KWAJ_MATCHLEN2_SYMS];
unsigned char LITLEN_len [KWAJ_LITLEN_SYMS];
unsigned char OFFSET_len [KWAJ_OFFSET_SYMS];
unsigned char LITERAL_len [KWAJ_LITERAL_SYMS];
/* huffman decoding tables */
unsigned short MATCHLEN1_table [KWAJ_MATCHLEN1_TBLSIZE];
unsigned short MATCHLEN2_table [KWAJ_MATCHLEN2_TBLSIZE];
unsigned short LITLEN_table [KWAJ_LITLEN_TBLSIZE];
unsigned short OFFSET_table [KWAJ_OFFSET_TBLSIZE];
unsigned short LITERAL_table [KWAJ_LITERAL_TBLSIZE];
/* input buffer */
unsigned char inbuf[KWAJ_INPUT_SIZE];
/* history window */
unsigned char window[LZSS_WINDOW_SIZE];
};
#endif
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