/* lzo1b_de.h -- definitions for the the LZO1B/LZO1C algorithm

   This file is part of the LZO real-time data compression library.

   Copyright (C) 1996-2014 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 */

/*

vi:ts=4:et

*/