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