1/* config2a.h -- configuration for the LZO2A algorithm 2 3 This file is part of the LZO real-time data compression library. 4 5 Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer 6 Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer 7 Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer 8 Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer 9 Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer 10 Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer 11 Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer 12 Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer 13 Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer 14 Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer 15 Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer 16 Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer 17 Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer 18 Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer 19 Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer 20 Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer 21 All Rights Reserved. 22 23 The LZO library is free software; you can redistribute it and/or 24 modify it under the terms of the GNU General Public License as 25 published by the Free Software Foundation; either version 2 of 26 the License, or (at your option) any later version. 27 28 The LZO library is distributed in the hope that it will be useful, 29 but WITHOUT ANY WARRANTY; without even the implied warranty of 30 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 31 GNU General Public License for more details. 32 33 You should have received a copy of the GNU General Public License 34 along with the LZO library; see the file COPYING. 35 If not, write to the Free Software Foundation, Inc., 36 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 37 38 Markus F.X.J. Oberhumer 39 <markus@oberhumer.com> 40 http://www.oberhumer.com/opensource/lzo/ 41 */ 42 43 44/* WARNING: this file should *not* be used by applications. It is 45 part of the implementation of the library and is subject 46 to change. 47 */ 48 49 50#ifndef __LZO_CONFIG2A_H 51#define __LZO_CONFIG2A_H 1 52 53#include "lzo_conf.h" 54#include "lzo/lzo2a.h" 55 56 57/*********************************************************************** 58// algorithm configuration 59************************************************************************/ 60 61/* dictionary depth (0 - 6) - this only affects the compressor. 62 * 0 is fastest, 6 is best compression ratio */ 63#if !defined(DDBITS) 64# define DDBITS 0 65#endif 66 67/* compression level (1 - 9) - this only affects the compressor. 68 * 1 is fastest, 9 is best compression ratio */ 69#if !defined(CLEVEL) 70# define CLEVEL 1 /* fastest by default */ 71#endif 72 73 74/* check configuration */ 75#if (DDBITS < 0 || DDBITS > 6) 76# error "invalid DDBITS" 77#endif 78#if (CLEVEL < 1 || CLEVEL > 9) 79# error "invalid CLEVEL" 80#endif 81 82 83/*********************************************************************** 84// internal configuration 85************************************************************************/ 86 87#if 1 88#define SWD_N 8191 /* size of ring buffer */ 89#else 90#define SWD_N 16383 /* size of ring buffer */ 91#endif 92 93#define M1_MIN_LEN 2 94#define M1_MAX_LEN 5 95#define M2_MIN_LEN 3 96#define M3_MIN_LEN 3 97 98 99/* add a special code so that the decompressor can detect the 100 * end of the compressed data block (overhead is 3 bytes per block) */ 101#define LZO_EOF_CODE 1 102 103#undef LZO_DETERMINISTIC 104 105 106/*********************************************************************** 107// algorithm internal configuration 108************************************************************************/ 109 110/* choose the hashing strategy */ 111#ifndef LZO_HASH 112#define LZO_HASH LZO_HASH_LZO_INCREMENTAL_A 113#endif 114 115/* config */ 116#define DD_BITS DDBITS 117#ifndef D_BITS 118#define D_BITS 14 119#endif 120 121 122 123/*********************************************************************** 124// optimization and debugging 125************************************************************************/ 126 127/* Collect statistics */ 128#if 0 && !defined(LZO_COLLECT_STATS) 129# define LZO_COLLECT_STATS 1 130#endif 131 132 133/*********************************************************************** 134// 135************************************************************************/ 136 137/* get bits */ 138#define _NEEDBITS \ 139 { _NEEDBYTE; b |= ((lzo_uint32) _NEXTBYTE) << k; k += 8; assert(k <= 32); } 140#define NEEDBITS(j) { assert((j) < 8); if (k < (j)) _NEEDBITS } 141 142/* set bits */ 143#define SETBITS(j,x) { b |= (x) << k; k += (j); assert(k <= 32); } 144 145/* access bits */ 146#define MASKBITS(j) (b & ((((lzo_uint32)1 << (j)) - 1))) 147 148/* drop bits */ 149#define DUMPBITS(j) { assert(k >= j); b >>= (j); k -= (j); } 150 151 152 153#endif /* already included */ 154 155/* 156vi:ts=4:et 157*/ 158 159