explode.h

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/*
 *  explode.h -- header file for PKWARE data decompression library
 *               used by mpq-tools.
 *
 *  Copyright (C) 2003 Maik Broemme <[e-mail]>
 *
 *  This source was adepted from the C++ version of pklib.h included
 *  in stormlib. The C++ version belongs to the following authors,
 *
 *  Ladislav Zezula <ladik.zezula.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifndef _EXPLODE_H
#define _EXPLODE_H


#define LIBMPQ_PKZIP_EXP_BUFFER_SIZE	12596		/* Size of decompress buffer */
#define LIBMPQ_PKZIP_CMP_BINARY		0		/* Binary compression */
#define LIBMPQ_PKZIP_CMP_ASCII		1		/* Ascii compression */
#define LIBMPQ_PKZIP_CMP_NO_ERROR	0
#define LIBMPQ_PKZIP_CMP_INV_DICTSIZE	1
#define LIBMPQ_PKZIP_CMP_INV_MODE	2
#define LIBMPQ_PKZIP_CMP_BAD_DATA	3
#define LIBMPQ_PKZIP_CMP_ABORT		4


/* Compression structure (size: 12596 bytes on x86-32) */
#pragma pack(push,1)
typedef struct {
	unsigned long	offs0000;		/* 0000 */
	unsigned long	cmp_type;		/* 0004 - Compression type (LIBMPQ_PZIP_CMP_BINARY or LIBMPQ_PKZIP_CMP_ASCII) */
	unsigned long	out_pos;		/* 0008 - Position in output buffer */
	unsigned long	dsize_bits;		/* 000C - Dict size (4, 5, 6 for 0x400, 0x800, 0x1000) */
	unsigned long	dsize_mask;		/* 0010 - Dict size bitmask (0x0F, 0x1F, 0x3F for 0x400, 0x800, 0x1000) */
	unsigned long	bit_buf;		/* 0014 - 16-bit buffer for processing input data */
	unsigned long	extra_bits;		/* 0018 - Number of extra (above 8) bits in bit buffer */
	unsigned int	in_pos;			/* 001C - Position in in_buf */
	unsigned long	in_bytes;		/* 0020 - Number of bytes in input buffer */
	void		*param;			/* 0024 - Custom parameter */
	unsigned int	(*read_buf)(char *buf, unsigned  int *size, void *param);	/* 0028 */
	void		(*write_buf)(char *buf, unsigned  int *size, void *param);	/* 002C */
	unsigned char	out_buf[0x2000];	/* 0030 - Output circle buffer. Starting position is 0x1000 */
	unsigned char	offs_2030[0x204];	/* 2030 - ??? */
	unsigned char	in_buf[0x800];		/* 2234 - Buffer for data to be decompressed */
	unsigned char	pos1[0x100];		/* 2A34 - Positions in buffers */
	unsigned char	pos2[0x100];		/* 2B34 - Positions in buffers */
	unsigned char	offs_2c34[0x100];	/* 2C34 - Buffer for */
	unsigned char	offs_2d34[0x100];	/* 2D34 - Buffer for */
	unsigned char	offs_2e34[0x80];	/* 2EB4 - Buffer for */
	unsigned char	offs_2eb4[0x100];	/* 2EB4 - Buffer for */
	unsigned char	bits_asc[0x100];	/* 2FB4 - Buffer for */
	unsigned char	dist_bits[0x40];	/* 30B4 - Numbers of bytes to skip copied block length */
	unsigned char	slen_bits[0x10];	/* 30F4 - Numbers of bits for skip copied block length */
	unsigned char	clen_bits[0x10];	/* 3104 - Number of valid bits for copied block */
	unsigned short	len_base[0x10];		/* 3114 - Buffer for */
} pkzip_data_cmp; // __attribute__ ((packed)) pkzip_data_cmp;
#pragma pack(pop)


typedef struct {
	char		*in_buf;	/* Pointer to input data buffer */
	unsigned int	in_pos;		/* Current offset in input data buffer */
	int		in_bytes;	/* Number of bytes in the input buffer */
	char		*out_buf;	/* Pointer to output data buffer */
	unsigned int	out_pos;	/* Position in the output buffer */
	int		max_out;	/* Maximum number of bytes in the output buffer */
} pkzip_data;

extern unsigned int libmpq_pkzip_explode(
	unsigned int	(*read_buf)(char *buf, unsigned int *size, void *param),
	void		(*write_buf)(char *buf, unsigned int *size, void *param),
	char		*work_buf,
	void		*param
);

#endif					/* _EXPLODE_H */