153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
/*
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* $QNXtpLicenseC:
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* Copyright 2007, QNX Software Systems. All Rights Reserved.
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*
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* You must obtain a written license from and pay applicable license fees to QNX
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* Software Systems before you may reproduce, modify or distribute this software,
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* or any work that includes all or part of this software. Free development
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* licenses are available for evaluation and non-commercial purposes. For more
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* information visit http://licensing.qnx.com or email licensing@qnx.com.
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*
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* This file may contain contributions from others. Please review this entire
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* file for other proprietary rights or license notices, as well as the QNX
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* Development Suite License Guide at http://licensing.qnx.com/license-guide/
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* for other information.
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* $
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*/
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/* config2a.h -- configuration for the LZO2A algorithm
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This file is part of the LZO real-time data compression library.
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Copyright (C) 1996-1999 Markus Franz Xaver Johannes Oberhumer
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Markus F.X.J. Oberhumer
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markus.oberhumer@jk.uni-linz.ac.at
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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_CONFIG2A_H
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#define __LZO_CONFIG2A_H
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#include <lzo2a.h>
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#include "lzo_conf.h"
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#include "lzo_util.h"
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/***********************************************************************
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// algorithm configuration
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************************************************************************/
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/* dictionary depth (0 - 6) - this only affects the compressor.
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* 0 is fastest, 6 is best compression ratio */
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#if !defined(DDBITS)
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# define DDBITS 0
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#endif
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/* compression level (1 - 9) - this only affects the compressor.
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* 1 is fastest, 9 is best compression ratio */
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#if !defined(CLEVEL)
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# define CLEVEL 1 /* fastest by default */
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#endif
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/* check configuration */
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#if (DDBITS < 0 || DDBITS > 6)
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# error invalid DDBITS
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#endif
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#if (CLEVEL < 1 || CLEVEL > 9)
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# error invalid CLEVEL
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#endif
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/***********************************************************************
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// internal configuration
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************************************************************************/
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#if 1
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#define N 8191 /* size of ring buffer */
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#else
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#define N 16383 /* size of ring buffer */
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#endif
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#define M1_MIN_LEN 2
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#define M1_MAX_LEN 5
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#define M2_MIN_LEN 3
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#define M3_MIN_LEN 3
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/* add a special code so that the decompressor can detect the
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* end of the compressed data block (overhead is 3 bytes per block) */
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#undef LZO_EOF_CODE
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#define LZO_EOF_CODE
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/* return -1 instead of copying if the data cannot be compressed */
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#undef LZO_RETURN_IF_NOT_COMPRESSIBLE
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#undef LZO_DETERMINISTIC
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/***********************************************************************
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// algorithm internal configuration
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************************************************************************/
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/* choose the hashing strategy */
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#ifndef LZO_HASH
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#define LZO_HASH LZO_HASH_LZO_INCREMENTAL_A
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#endif
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/* config */
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#define DD_BITS DDBITS
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#ifndef D_BITS
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#define D_BITS 14
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#endif
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/***********************************************************************
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// optimization and debugging
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************************************************************************/
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/* Collect statistics */
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#if 0 && !defined(LZO_COLLECT_STATS)
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# define LZO_COLLECT_STATS
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#endif
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/***********************************************************************
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//
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************************************************************************/
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/* get bits */
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#define _NEEDBITS \
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{ _NEEDBYTE; b |= ((lzo_uint32) _NEXTBYTE) << k; k += 8; assert(k <= 32); }
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#define NEEDBITS(j) { assert((j) < 8); if (k < (j)) _NEEDBITS }
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/* set bits */
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#define SETBITS(j,x) { b |= (x) << k; k += (j); assert(k <= 32); }
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/* access bits */
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#define MASKBITS(j) (b & ((((lzo_uint32)1 << (j)) - 1)))
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/* drop bits */
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#define DUMPBITS(j) { assert(k >= j); b >>= (j); k -= (j); }
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#endif /* already included */
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/*
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vi:ts=4
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*/
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