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/* lzo1b_de.h -- definitions for the the LZO1B/LZO1C algorithm
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library 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.
The LZO library 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 the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
/* WARNING: this file should *not* be used by applications. It is
part of the implementation of the library and is subject
to change.
*/
#ifndef __LZO_DEFS_H
#define __LZO_DEFS_H 1
#ifdef __cplusplus
extern "C" {
#endif
/***********************************************************************
//
************************************************************************/
/*
Format of the marker byte
76543210
--------
00000000 R0 - a long literal run ('R0' run)
000rrrrr R - a short literal run with len r
00100000 M4 - a very long match
001mmmmm M3 - a long match (len = m+M3_MIN_LEN)
mmmooooo M2 - a short match (len = m+M2_MIN_LEN, o = offset low bits)
M1 is not used !
*/
#ifndef R_BITS
#define R_BITS (5)
#endif
#ifndef M1L_BITS
#define M1L_BITS (0)
#endif
#ifndef M2L_BITS
#define M2L_BITS (CHAR_BIT - M2O_BITS)
#endif
#ifndef M3L_BITS
#define M3L_BITS (R_BITS)
#endif
#ifndef M4L_BITS
#define M4L_BITS (CHAR_BIT)
#endif
#ifndef M1O_BITS
#define M1O_BITS (6)
#endif
#ifndef M2O_BITS
#define M2O_BITS (R_BITS)
#endif
#ifndef M3O_BITS
#define M3O_BITS (CHAR_BIT)
#endif
#ifndef M4O_BITS
#define M4O_BITS (M3O_BITS) /* must be the same */
#endif
#ifndef M1X_BITS
#define M1X_BITS (M1O_BITS)
#endif
#ifndef M2X_BITS
#define M2X_BITS (M2O_BITS + CHAR_BIT)
#endif
#ifndef M3X_BITS
#define M3X_BITS (M3O_BITS + CHAR_BIT)
#endif
#ifndef M4X_BITS
#define M4X_BITS M3X_BITS
#endif
#define __MIN_OFFSET(bits) 1
#define __MAX_OFFSET(bits) LZO_SIZE(bits)
#define M1_MIN_OFFSET __MIN_OFFSET(M1X_BITS)
#define M2_MIN_OFFSET __MIN_OFFSET(M2X_BITS)
#define M3_MIN_OFFSET __MIN_OFFSET(M3X_BITS)
#define M4_MIN_OFFSET M3_MIN_OFFSET
#if defined(LZO_EOF_CODE) && !defined(M3_EOF_OFFSET)
#define M3_EOF_OFFSET 1
#else
#define M3_EOF_OFFSET 0
#endif
#ifndef _M1_MAX_OFFSET
#define _M1_MAX_OFFSET __MAX_OFFSET(M1X_BITS)
#endif
#ifndef _M2_MAX_OFFSET
#define _M2_MAX_OFFSET __MAX_OFFSET(M2X_BITS)
#endif
#ifndef _M3_MAX_OFFSET
#define _M3_MAX_OFFSET (__MAX_OFFSET(M3X_BITS) - M3_EOF_OFFSET)
#endif
#ifndef _M4_MAX_OFFSET
#define _M4_MAX_OFFSET _M3_MAX_OFFSET
#endif
#ifndef _MAX_OFFSET
#define _MAX_OFFSET _M4_MAX_OFFSET
#endif
#if (M3_EOF_OFFSET > 0) && (_M2_MAX_OFFSET == _M3_MAX_OFFSET + M3_EOF_OFFSET)
# undef _M2_MAX_OFFSET
# define _M2_MAX_OFFSET _M3_MAX_OFFSET
#endif
#if (_M2_MAX_OFFSET > _M3_MAX_OFFSET)
# error
#endif
#define M1_MAX_OFFSET ((lzo_uint) _M1_MAX_OFFSET)
#define M2_MAX_OFFSET ((lzo_uint) _M2_MAX_OFFSET)
#define M3_MAX_OFFSET ((lzo_uint) _M3_MAX_OFFSET)
#define M4_MAX_OFFSET ((lzo_uint) _M4_MAX_OFFSET)
#define MAX_OFFSET ((lzo_uint) _MAX_OFFSET)
#ifndef M1_MIN_LEN
#define M1_MIN_LEN (2)
#endif
#ifndef M2_MIN_LEN
#define M2_MIN_LEN (3)
#endif
#ifndef M3_MIN_LEN
#if (M3X_BITS == M2X_BITS)
#define M3_MIN_LEN (M2_MAX_LEN + 1)
#else
#define M3_MIN_LEN (4)
#endif
#endif
#ifndef M4_MIN_LEN
#define M4_MIN_LEN (M3_MAX_LEN + 1)
#endif
#ifndef M1_MAX_LEN
#define M1_MAX_LEN (M1_MIN_LEN + LZO_SIZE(M1L_BITS) - 1)
#endif
#ifndef M2_MAX_LEN
#define M2_MAX_LEN (M2_MIN_LEN + LZO_SIZE(M2L_BITS) - 3)
#endif
#ifndef M3_MAX_LEN
#define M3_MAX_LEN (M3_MIN_LEN + LZO_SIZE(M3L_BITS) - 2)
#endif
#ifndef M4_MAX_LEN
#define M4_MAX_LEN (ULONG_MAX)
#endif
#define M1O_MASK LZO_MASK(M1O_BITS)
#define M1L_MASK LZO_MASK(M1L_BITS)
#define M2O_MASK LZO_MASK(M2O_BITS)
#define M2L_MASK LZO_MASK(M2L_BITS)
#define M3O_MASK LZO_MASK(M3O_BITS)
#define M3L_MASK LZO_MASK(M3L_BITS)
#define M4O_MASK LZO_MASK(M4O_BITS)
#define M4L_MASK LZO_MASK(M4L_BITS)
#define M1_MARKER (1 << M1O_BITS)
#define M2_MARKER (2 << M2O_BITS)
#define M3_MARKER (1 << M3L_BITS)
#define M4_MARKER M3_MARKER
/***********************************************************************
// R0 literal run (a long run)
************************************************************************/
#ifndef R0MIN
#define R0MIN (LZO_SIZE(R_BITS)) /* Minimum len of R0 run of literals */
#endif
#define R0MAX (R0MIN + 256 - 1) /* Maximum len of R0 run of literals */
#if (R0MAX - (R0MAX & ~7u) >= 7)
#define R0FAST (R0MAX & ~7u) /* R0MAX aligned to 8 byte boundary */
#else
#define R0FAST (R0MAX & ~15u) /* R0MAX aligned to 8 byte boundary */
#endif
#if (R0MAX - R0FAST < 7) || ((R0FAST & 7) != 0)
# error "something went wrong"
#endif
#if (R0FAST * 2 < 512)
# error "R0FAST is not big enough"
#endif
/* 7 special codes from R0FAST+1 .. R0MAX
* these codes mean long R0 runs with lengths
* 512, 1024, 2048, 4096, 8192, 16384, 32768
*/
/***********************************************************************
// matching
************************************************************************/
#define PS *m_pos++ != *ip++
/* We already matched M2_MIN_LEN bytes.
* Try to match another M2_MAX_LEN - M2_MIN_LEN bytes. */
#if (M2_MAX_LEN - M2_MIN_LEN == 4)
# define MATCH_M2X (PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 5)
# define MATCH_M2X (PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 6)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 7)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 13)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 14)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 16)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS || PS || PS || PS)
#elif (M2_MAX_LEN - M2_MIN_LEN == 29)
# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS || PS || PS || PS || \
PS || PS || PS || PS || PS)
#else
# error "MATCH_M2X not yet implemented"
#endif
/* We already matched M2_MIN_LEN bytes.
* Try to match another M2_MAX_LEN + 1 - M2_MIN_LEN bytes
* to see if we get more than a M2 match */
#define MATCH_M2 (MATCH_M2X || PS)
/***********************************************************************
// copying
************************************************************************/
#define _CP *op++ = *m_pos++
#if (M2_MIN_LEN == 2)
# define COPY_M2X _CP
#elif (M2_MIN_LEN == 3)
# define COPY_M2X _CP; _CP
#elif (M2_MIN_LEN == 4)
# define COPY_M2X _CP; _CP; _CP
#else
# error "COPY_M2X not yet implemented"
#endif
#if (M3_MIN_LEN == 3)
# define COPY_M3X _CP; _CP
#elif (M3_MIN_LEN == 4)
# define COPY_M3X _CP; _CP; _CP
#elif (M3_MIN_LEN == 9)
# define COPY_M3X _CP; _CP; _CP; _CP; _CP; _CP; _CP; _CP
#else
# error "COPY_M3X not yet implemented"
#endif
#define COPY_M2 COPY_M2X; *op++ = *m_pos++
#define COPY_M3 COPY_M3X; *op++ = *m_pos++
/***********************************************************************
//
************************************************************************/
#if defined(LZO_NEED_DICT_H)
#define DL_MIN_LEN M2_MIN_LEN
#define D_INDEX1(d,p) d = DM(DMUL(0x21,DX3(p,5,5,6)) >> 5)
#define D_INDEX2(d,p) d = (d & (D_MASK & 0x7ff)) ^ (D_HIGH | 0x1f)
#include "lzo_dict.h"
#ifndef MIN_LOOKAHEAD
#define MIN_LOOKAHEAD (M2_MAX_LEN + 1)
#endif
#ifndef MAX_LOOKBEHIND
#define MAX_LOOKBEHIND (MAX_OFFSET)
#endif
#endif /* defined(LZO_NEED_DICT_H) */
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* already included */
/* vim:set ts=4 sw=4 et: */
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