mirror of https://github.com/libAthena/athena.git
331 lines
9.0 KiB
C
331 lines
9.0 KiB
C
/* lzo1b_de.h -- definitions for the the LZO1B/LZO1C algorithm
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This file is part of the LZO real-time data compression library.
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Copyright (C) 1996-2015 Markus Franz Xaver Johannes Oberhumer
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All Rights Reserved.
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The LZO library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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The LZO library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the LZO library; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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Markus F.X.J. Oberhumer
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<markus@oberhumer.com>
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http://www.oberhumer.com/opensource/lzo/
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*/
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/* WARNING: this file should *not* be used by applications. It is
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part of the implementation of the library and is subject
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to change.
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*/
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#ifndef __LZO_DEFS_H
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#define __LZO_DEFS_H 1
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#ifdef __cplusplus
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extern "C" {
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#endif
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/***********************************************************************
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//
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************************************************************************/
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/*
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Format of the marker byte
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76543210
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--------
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00000000 R0 - a long literal run ('R0' run)
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000rrrrr R - a short literal run with len r
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00100000 M4 - a very long match
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001mmmmm M3 - a long match (len = m+M3_MIN_LEN)
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mmmooooo M2 - a short match (len = m+M2_MIN_LEN, o = offset low bits)
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M1 is not used !
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*/
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#ifndef R_BITS
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#define R_BITS (5)
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#endif
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#ifndef M1L_BITS
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#define M1L_BITS (0)
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#endif
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#ifndef M2L_BITS
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#define M2L_BITS (CHAR_BIT - M2O_BITS)
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#endif
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#ifndef M3L_BITS
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#define M3L_BITS (R_BITS)
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#endif
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#ifndef M4L_BITS
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#define M4L_BITS (CHAR_BIT)
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#endif
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#ifndef M1O_BITS
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#define M1O_BITS (6)
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#endif
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#ifndef M2O_BITS
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#define M2O_BITS (R_BITS)
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#endif
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#ifndef M3O_BITS
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#define M3O_BITS (CHAR_BIT)
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#endif
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#ifndef M4O_BITS
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#define M4O_BITS (M3O_BITS) /* must be the same */
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#endif
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#ifndef M1X_BITS
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#define M1X_BITS (M1O_BITS)
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#endif
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#ifndef M2X_BITS
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#define M2X_BITS (M2O_BITS + CHAR_BIT)
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#endif
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#ifndef M3X_BITS
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#define M3X_BITS (M3O_BITS + CHAR_BIT)
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#endif
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#ifndef M4X_BITS
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#define M4X_BITS M3X_BITS
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#endif
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#define __MIN_OFFSET(bits) 1
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#define __MAX_OFFSET(bits) LZO_SIZE(bits)
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#define M1_MIN_OFFSET __MIN_OFFSET(M1X_BITS)
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#define M2_MIN_OFFSET __MIN_OFFSET(M2X_BITS)
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#define M3_MIN_OFFSET __MIN_OFFSET(M3X_BITS)
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#define M4_MIN_OFFSET M3_MIN_OFFSET
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#if defined(LZO_EOF_CODE) && !defined(M3_EOF_OFFSET)
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#define M3_EOF_OFFSET 1
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#else
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#define M3_EOF_OFFSET 0
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#endif
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#ifndef _M1_MAX_OFFSET
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#define _M1_MAX_OFFSET __MAX_OFFSET(M1X_BITS)
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#endif
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#ifndef _M2_MAX_OFFSET
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#define _M2_MAX_OFFSET __MAX_OFFSET(M2X_BITS)
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#endif
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#ifndef _M3_MAX_OFFSET
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#define _M3_MAX_OFFSET (__MAX_OFFSET(M3X_BITS) - M3_EOF_OFFSET)
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#endif
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#ifndef _M4_MAX_OFFSET
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#define _M4_MAX_OFFSET _M3_MAX_OFFSET
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#endif
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#ifndef _MAX_OFFSET
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#define _MAX_OFFSET _M4_MAX_OFFSET
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#endif
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#if (M3_EOF_OFFSET > 0) && (_M2_MAX_OFFSET == _M3_MAX_OFFSET + M3_EOF_OFFSET)
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# undef _M2_MAX_OFFSET
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# define _M2_MAX_OFFSET _M3_MAX_OFFSET
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#endif
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#if (_M2_MAX_OFFSET > _M3_MAX_OFFSET)
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# error
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#endif
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#define M1_MAX_OFFSET ((lzo_uint) _M1_MAX_OFFSET)
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#define M2_MAX_OFFSET ((lzo_uint) _M2_MAX_OFFSET)
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#define M3_MAX_OFFSET ((lzo_uint) _M3_MAX_OFFSET)
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#define M4_MAX_OFFSET ((lzo_uint) _M4_MAX_OFFSET)
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#define MAX_OFFSET ((lzo_uint) _MAX_OFFSET)
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#ifndef M1_MIN_LEN
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#define M1_MIN_LEN (2)
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#endif
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#ifndef M2_MIN_LEN
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#define M2_MIN_LEN (3)
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#endif
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#ifndef M3_MIN_LEN
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#if (M3X_BITS == M2X_BITS)
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#define M3_MIN_LEN (M2_MAX_LEN + 1)
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#else
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#define M3_MIN_LEN (4)
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#endif
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#endif
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#ifndef M4_MIN_LEN
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#define M4_MIN_LEN (M3_MAX_LEN + 1)
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#endif
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#ifndef M1_MAX_LEN
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#define M1_MAX_LEN (M1_MIN_LEN + LZO_SIZE(M1L_BITS) - 1)
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#endif
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#ifndef M2_MAX_LEN
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#define M2_MAX_LEN (M2_MIN_LEN + LZO_SIZE(M2L_BITS) - 3)
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#endif
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#ifndef M3_MAX_LEN
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#define M3_MAX_LEN (M3_MIN_LEN + LZO_SIZE(M3L_BITS) - 2)
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#endif
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#ifndef M4_MAX_LEN
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#define M4_MAX_LEN (ULONG_MAX)
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#endif
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#define M1O_MASK LZO_MASK(M1O_BITS)
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#define M1L_MASK LZO_MASK(M1L_BITS)
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#define M2O_MASK LZO_MASK(M2O_BITS)
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#define M2L_MASK LZO_MASK(M2L_BITS)
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#define M3O_MASK LZO_MASK(M3O_BITS)
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#define M3L_MASK LZO_MASK(M3L_BITS)
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#define M4O_MASK LZO_MASK(M4O_BITS)
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#define M4L_MASK LZO_MASK(M4L_BITS)
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#define M1_MARKER (1 << M1O_BITS)
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#define M2_MARKER (2 << M2O_BITS)
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#define M3_MARKER (1 << M3L_BITS)
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#define M4_MARKER M3_MARKER
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/***********************************************************************
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// R0 literal run (a long run)
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************************************************************************/
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#ifndef R0MIN
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#define R0MIN (LZO_SIZE(R_BITS)) /* Minimum len of R0 run of literals */
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#endif
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#define R0MAX (R0MIN + 256 - 1) /* Maximum len of R0 run of literals */
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#if (R0MAX - (R0MAX & ~7u) >= 7)
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#define R0FAST (R0MAX & ~7u) /* R0MAX aligned to 8 byte boundary */
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#else
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#define R0FAST (R0MAX & ~15u) /* R0MAX aligned to 8 byte boundary */
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#endif
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#if (R0MAX - R0FAST < 7) || ((R0FAST & 7) != 0)
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# error "something went wrong"
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#endif
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#if (R0FAST * 2 < 512)
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# error "R0FAST is not big enough"
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#endif
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/* 7 special codes from R0FAST+1 .. R0MAX
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* these codes mean long R0 runs with lengths
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* 512, 1024, 2048, 4096, 8192, 16384, 32768
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*/
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/***********************************************************************
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// matching
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************************************************************************/
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#define PS *m_pos++ != *ip++
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/* We already matched M2_MIN_LEN bytes.
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* Try to match another M2_MAX_LEN - M2_MIN_LEN bytes. */
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#if (M2_MAX_LEN - M2_MIN_LEN == 4)
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# define MATCH_M2X (PS || PS || PS || PS)
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#elif (M2_MAX_LEN - M2_MIN_LEN == 5)
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# define MATCH_M2X (PS || PS || PS || PS || PS)
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#elif (M2_MAX_LEN - M2_MIN_LEN == 6)
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# define MATCH_M2X (PS || PS || PS || PS || PS || PS)
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#elif (M2_MAX_LEN - M2_MIN_LEN == 7)
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# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS)
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#elif (M2_MAX_LEN - M2_MIN_LEN == 13)
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# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
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PS || PS || PS || PS || PS)
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#elif (M2_MAX_LEN - M2_MIN_LEN == 14)
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# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
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PS || PS || PS || PS || PS || PS)
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#elif (M2_MAX_LEN - M2_MIN_LEN == 16)
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# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
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PS || PS || PS || PS || PS || PS || PS || PS)
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#elif (M2_MAX_LEN - M2_MIN_LEN == 29)
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# define MATCH_M2X (PS || PS || PS || PS || PS || PS || PS || PS || \
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PS || PS || PS || PS || PS || PS || PS || PS || \
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PS || PS || PS || PS || PS || PS || PS || PS || \
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PS || PS || PS || PS || PS)
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#else
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# error "MATCH_M2X not yet implemented"
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#endif
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/* We already matched M2_MIN_LEN bytes.
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* Try to match another M2_MAX_LEN + 1 - M2_MIN_LEN bytes
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* to see if we get more than a M2 match */
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#define MATCH_M2 (MATCH_M2X || PS)
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/***********************************************************************
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// copying
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************************************************************************/
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#define _CP *op++ = *m_pos++
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#if (M2_MIN_LEN == 2)
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# define COPY_M2X _CP
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#elif (M2_MIN_LEN == 3)
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# define COPY_M2X _CP; _CP
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#elif (M2_MIN_LEN == 4)
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# define COPY_M2X _CP; _CP; _CP
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#else
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# error "COPY_M2X not yet implemented"
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#endif
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#if (M3_MIN_LEN == 3)
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# define COPY_M3X _CP; _CP
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#elif (M3_MIN_LEN == 4)
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# define COPY_M3X _CP; _CP; _CP
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#elif (M3_MIN_LEN == 9)
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# define COPY_M3X _CP; _CP; _CP; _CP; _CP; _CP; _CP; _CP
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#else
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# error "COPY_M3X not yet implemented"
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#endif
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#define COPY_M2 COPY_M2X; *op++ = *m_pos++
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#define COPY_M3 COPY_M3X; *op++ = *m_pos++
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/***********************************************************************
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//
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************************************************************************/
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#if defined(LZO_NEED_DICT_H)
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#define DL_MIN_LEN M2_MIN_LEN
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#define D_INDEX1(d,p) d = DM(DMUL(0x21,DX3(p,5,5,6)) >> 5)
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#define D_INDEX2(d,p) d = (d & (D_MASK & 0x7ff)) ^ (D_HIGH | 0x1f)
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#include "lzo_dict.h"
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#ifndef MIN_LOOKAHEAD
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#define MIN_LOOKAHEAD (M2_MAX_LEN + 1)
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#endif
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#ifndef MAX_LOOKBEHIND
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#define MAX_LOOKBEHIND (MAX_OFFSET)
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#endif
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#endif /* defined(LZO_NEED_DICT_H) */
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* already included */
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/* vim:set ts=4 sw=4 et: */
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