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/* config2a.h -- configuration for the LZO2A algorithm
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2017 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 1
#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 SWD_N 8191 /* size of ring buffer */
#else
#define SWD_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 1
#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 1
#endif
/***********************************************************************
//
************************************************************************/
/* get bits */
#define _NEEDBITS \
{ _NEEDBYTE; b |= ((lzo_uint32_t) _NEXTBYTE) << k; k += 8; assert(k <= 32); }
#define NEEDBITS(j) { assert((j) < 8); if (k < (j)) _NEEDBITS }
/* set bits */
#define SETBITS(j,x) { b |= ((lzo_uint32_t)(x)) << k; k += (j); assert(k <= 32); }
/* access bits */
#define MASKBITS(j) (b & ((((lzo_uint32_t)1 << (j)) - 1)))
/* drop bits */
#define DUMPBITS(j) { assert(k >= j); b >>= (j); k -= (j); }
#endif /* already included */
/* vim:set ts=4 sw=4 et: */
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