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//Copyright Paul Reiche, Fred Ford. 1992-2002
/*
* 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 LIBS_DECOMP_LZH_H_
#define LIBS_DECOMP_LZH_H_
#include "libs/declib.h"
#include "libs/memlib.h"
/* LZSS Parameters */
#define N 4096 /* Size of string buffer */
#define F 16 /* Size of look-ahead buffer */
//#define F 60 /* Size of look-ahead buffer */
#define THRESHOLD 2
#define NIL N /* End of tree's node */
/* Huffman coding parameters */
#define N_CHAR (256 - THRESHOLD + F)
/* character code (= 0..N_CHAR-1) */
#define T (N_CHAR * 2 - 1) /* Size of table */
#define R (T - 1) /* root position */
#define MAX_FREQ 0x8000
/* update when cumulative frequency */
struct _LZHCODE_DESC
{
COUNT buf_index, restart_index, bytes_left;
BYTE text_buf[N + F - 1];
/* reconstruct freq tree */
COUNT freq[T + 1]; /* cumulative freq table */
/*
* pointing parent nodes.
* area [T..(T + N_CHAR - 1)] are pointers for leaves
*/
COUNT prnt[T + N_CHAR];
/* pointing children nodes (son[], son[] + 1)*/
COUNT son[T];
UWORD workbuf;
BYTE workbuflen;
STREAM_TYPE StreamType;
void *Stream;
DWORD StreamIndex, StreamLength;
STREAM_MODE StreamMode;
PVOIDFUNC CleanupFunc;
};
typedef struct _LZHCODE_DESC LZHCODE_DESC;
typedef LZHCODE_DESC *PLZHCODE_DESC;
#define InChar() (_StreamType == FILE_STREAM ? \
GetResFileChar ((uio_Stream *)_Stream) : \
(int)*_Stream++)
#define OutChar(c) (_StreamType == FILE_STREAM ? \
PutResFileChar ((c), (uio_Stream *)_Stream) : \
(*_Stream++ = (BYTE)(c)))
#define AllocCodeDesc() HCalloc (sizeof (LZHCODE_DESC))
#define FreeCodeDesc HFree
extern void _update (COUNT c);
extern void StartHuff (void);
extern PLZHCODE_DESC _lpCurCodeDesc;
extern STREAM_TYPE _StreamType;
extern BYTE* _Stream;
extern UWORD _workbuf;
extern BYTE _workbuflen;
#endif /* LIBS_DECOMP_LZH_H_ */
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