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Diffstat (limited to 'src/config2a.h')
| -rw-r--r-- | src/config2a.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/src/config2a.h b/src/config2a.h new file mode 100644 index 0000000..ba38ca5 --- /dev/null +++ b/src/config2a.h @@ -0,0 +1,155 @@ +/* config2a.h -- configuration for the LZO2A algorithm + + This file is part of the LZO real-time data compression library. + + Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer + Copyright (C) 1996 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_CONFIG2A_H +#define __LZO_CONFIG2A_H + +#include "lzo_conf.h" +#include "lzo/lzo2a.h" + + +/*********************************************************************** +// algorithm configuration +************************************************************************/ + +/* dictionary depth (0 - 6) - this only affects the compressor. + * 0 is fastest, 6 is best compression ratio */ +#if !defined(DDBITS) +# define DDBITS 0 +#endif + +/* compression level (1 - 9) - this only affects the compressor. + * 1 is fastest, 9 is best compression ratio */ +#if !defined(CLEVEL) +# define CLEVEL 1 /* fastest by default */ +#endif + + +/* check configuration */ +#if (DDBITS < 0 || DDBITS > 6) +# error "invalid DDBITS" +#endif +#if (CLEVEL < 1 || CLEVEL > 9) +# error "invalid CLEVEL" +#endif + + +/*********************************************************************** +// internal configuration +************************************************************************/ + +#if 1 +#define N 8191 /* size of ring buffer */ +#else +#define N 16383 /* size of ring buffer */ +#endif + +#define M1_MIN_LEN 2 +#define M1_MAX_LEN 5 +#define M2_MIN_LEN 3 +#define M3_MIN_LEN 3 + + +/* add a special code so that the decompressor can detect the + * end of the compressed data block (overhead is 3 bytes per block) */ +#define LZO_EOF_CODE + +#undef LZO_DETERMINISTIC + + +/*********************************************************************** +// algorithm internal configuration +************************************************************************/ + +/* choose the hashing strategy */ +#ifndef LZO_HASH +#define LZO_HASH LZO_HASH_LZO_INCREMENTAL_A +#endif + +/* config */ +#define DD_BITS DDBITS +#ifndef D_BITS +#define D_BITS 14 +#endif + + + +/*********************************************************************** +// optimization and debugging +************************************************************************/ + +/* Collect statistics */ +#if 0 && !defined(LZO_COLLECT_STATS) +# define LZO_COLLECT_STATS +#endif + + +/*********************************************************************** +// +************************************************************************/ + +/* get bits */ +#define _NEEDBITS \ + { _NEEDBYTE; b |= ((lzo_uint32) _NEXTBYTE) << k; k += 8; assert(k <= 32); } +#define NEEDBITS(j) { assert((j) < 8); if (k < (j)) _NEEDBITS } + +/* set bits */ +#define SETBITS(j,x) { b |= (x) << k; k += (j); assert(k <= 32); } + +/* access bits */ +#define MASKBITS(j) (b & ((((lzo_uint32)1 << (j)) - 1))) + +/* drop bits */ +#define DUMPBITS(j) { assert(k >= j); b >>= (j); k -= (j); } + + + +#endif /* already included */ + +/* +vi:ts=4:et +*/ + |