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/* lzo1a_de.h -- definitions for the the LZO1A algorithm
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This file is part of the LZO real-time data compression library.
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Copyright (C) 1996-2014 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 LZO package 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 a long literal run ('R0' run) - there are short and long R0 runs
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000rrrrr a short literal run with len r
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mmmooooo a short match (len = 2+m, o = offset low bits)
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111ooooo a long match (o = offset low bits)
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*/
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#define RSIZE (1 << RBITS)
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#define RMASK (RSIZE - 1)
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#define MBITS (8 - OBITS)
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#define MSIZE (1 << MBITS)
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#define MMASK (MSIZE - 1)
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#define OBITS RBITS /* offset and run-length use same bits */
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#define OSIZE (1 << OBITS)
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#define OMASK (OSIZE - 1)
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/* additional bits for coding the length in a long match */
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#define LBITS 8
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#define LSIZE (1 << LBITS)
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#define LMASK (LSIZE - 1)
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/***********************************************************************
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// some macros to improve readability
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************************************************************************/
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/* Minimum len of a match */
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#define MIN_MATCH 3
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#define THRESHOLD (MIN_MATCH - 1)
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/* Min-/Maximum len of a match coded in 2 bytes */
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#define MIN_MATCH_SHORT (MIN_MATCH)
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#define MAX_MATCH_SHORT (MIN_MATCH_SHORT + (MSIZE - 2) - 1)
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/* why (MSIZE - 2) ? because 0 is used to mark runs,
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* and MSIZE-1 is used to mark a long match */
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/* Min-/Maximum len of a match coded in 3 bytes */
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#define MIN_MATCH_LONG (MAX_MATCH_SHORT + 1)
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#define MAX_MATCH_LONG (MIN_MATCH_LONG + LSIZE - 1)
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/* Min-/Maximum offset of a match */
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#define MIN_OFFSET 1
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#define MAX_OFFSET (1 << (CHAR_BIT + OBITS))
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/* R0 literal run (a long run) */
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#define R0MIN (RSIZE) /* Minimum len of R0 run of literals */
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#define R0MAX (R0MIN + 255) /* Maximum len of R0 run of literals */
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#define R0FAST (R0MAX & ~7) /* R0MAX aligned to 8 byte boundary */
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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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/* 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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RBITS | MBITS MIN THR. MSIZE MAXS MINL MAXL MAXO R0MAX R0FAST
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======+===============================================================
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3 | 5 3 2 32 32 33 288 2048 263 256
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4 | 4 3 2 16 16 17 272 4096 271 264
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5 | 3 3 2 8 8 9 264 8192 287 280
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*/
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/***********************************************************************
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//
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************************************************************************/
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#define DBITS 13
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#include "lzo_dict.h"
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#define DVAL_LEN DVAL_LOOKAHEAD
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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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/*
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vi:ts=4:et
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*/
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