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Comparing liblzf/lzfP.h (file contents):
Revision 1.7 by pcg, Mon Dec 29 12:48:16 2003 UTC vs.
Revision 1.17 by root, Mon Nov 5 23:28:40 2007 UTC

1/* 1/*
2 * Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com> 2 * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de>
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without modifica- 4 * Redistribution and use in source and binary forms, with or without modifica-
5 * tion, are permitted provided that the following conditions are met: 5 * tion, are permitted provided that the following conditions are met:
6 * 6 *
7 * 1. Redistributions of source code must retain the above copyright notice, 7 * 1. Redistributions of source code must retain the above copyright notice,
… …
9 * 9 *
10 * 2. Redistributions in binary form must reproduce the above copyright 10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the 11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution. 12 * documentation and/or other materials provided with the distribution.
13 * 13 *
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- 15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 16 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- 17 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 18 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 22 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE. 23 * OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * Alternatively, the contents of this file may be used under the terms of
26 * the GNU General Public License ("GPL") version 2 or any later version,
27 * in which case the provisions of the GPL are applicable instead of
28 * the above. If you wish to allow the use of your version of this file
29 * only under the terms of the GPL and not to allow others to use your
30 * version of this file under the BSD license, indicate your decision
31 * by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL. If you do not delete the
33 * provisions above, a recipient may use your version of this file under
34 * either the BSD or the GPL.
27 */ 35 */
28 36
29#ifndef LZFP_h 37#ifndef LZFP_h
30#define LZFP_h 38#define LZFP_h
31 39
32#define STANDALONE /* at the moment, this is ok. */ 40#define STANDALONE 1 /* at the moment, this is ok. */
33 41
34#ifndef STANDALONE 42#ifndef STANDALONE
35# include "lzf.h" 43# include "lzf.h"
36#endif 44#endif
37 45
38/* 46/*
39 * size of hashtable is (1 << HLOG) * sizeof (char *) 47 * Size of hashtable is (1 << HLOG) * sizeof (char *)
40 * decompression is independent of the hash table size 48 * decompression is independent of the hash table size
41 * the difference between 15 and 14 is very small 49 * the difference between 15 and 14 is very small
42 * for small blocks (and 14 is also faster). 50 * for small blocks (and 14 is usually a bit faster).
43 * For a low-memory configuration, use HLOG == 13; 51 * For a low-memory/faster configuration, use HLOG == 13;
44 * For best compression, use 15 or 16. 52 * For best compression, use 15 or 16 (or more).
45 */ 53 */
46#ifndef HLOG 54#ifndef HLOG
47# define HLOG 14 55# define HLOG 15
48#endif 56#endif
49 57
50/* 58/*
51 * sacrifice some compression quality in favour of compression speed. 59 * Sacrifice very little compression quality in favour of compression speed.
52 * (roughly 1-2% worse compression for large blocks and 60 * This gives almost the same compression as the default code, and is
53 * 9-10% for small, redundant, blocks and >>20% better speed in both cases) 61 * (very roughly) 15% faster. This is the preferable mode of operation.
54 * In short: enable this for binary data, disable this for text data.
55 */ 62 */
63
56#ifndef ULTRA_FAST 64#ifndef VERY_FAST
57# define ULTRA_FAST 1 65# define VERY_FAST 1
58#endif 66#endif
59 67
60/* 68/*
61 * unconditionally aligning does not cost very much, so do it if unsure 69 * Sacrifice some more compression quality in favour of compression speed.
70 * (roughly 1-2% worse compression for large blocks and
71 * 9-10% for small, redundant, blocks and >>20% better speed in both cases)
72 * In short: when in need for speed, enable this for binary data,
73 * possibly disable this for text data.
62 */ 74 */
63#ifndef STRICT_ALIGN 75#ifndef ULTRA_FAST
64# define STRICT_ALIGN !defined(__i386) 76# define ULTRA_FAST 0
65#endif 77#endif
66 78
67/* 79/*
68 * use string functions to copy memory. 80 * Unconditionally aligning does not cost very much, so do it if unsure
69 * this is usually a loss, even with glibc's optimized memcpy
70 */ 81 */
71#ifndef USE_MEMCPY 82#ifndef STRICT_ALIGN
72# define USE_MEMCPY 0 83# define STRICT_ALIGN !(defined(__i386) || defined (__amd64))
73#endif 84#endif
74 85
75/* 86/*
76 * you may choose to pre-set the hash table (might be faster on modern cpus 87 * You may choose to pre-set the hash table (might be faster on some
77 * and large (>>64k) blocks) 88 * modern cpus and large (>>64k) blocks, and also makes compression
89 * deterministic/repeatable when the configuration otherwise is the same).
78 */ 90 */
79#ifndef INIT_HTAB 91#ifndef INIT_HTAB
80# define INIT_HTAB 0 92# define INIT_HTAB 0
81#endif 93#endif
82 94
83/* 95/*
84 * avoid assigning values to errno variable? for some embedding purposes 96 * Avoid assigning values to errno variable? for some embedding purposes
85 * (linux kernel for example), this is neccessary. NOTE: this breaks 97 * (linux kernel for example), this is neccessary. NOTE: this breaks
86 * the documentation in lzf.h. 98 * the documentation in lzf.h.
87 */ 99 */
88#ifndef AVOID_ERRNO 100#ifndef AVOID_ERRNO
89# define AVOID_ERRNO 0 101# define AVOID_ERRNO 0
… …
94 * on the stack. For small-stack environments, define this to 1. 106 * on the stack. For small-stack environments, define this to 1.
95 * NOTE: this breaks the prototype in lzf.h. 107 * NOTE: this breaks the prototype in lzf.h.
96 */ 108 */
97#ifndef LZF_STATE_ARG 109#ifndef LZF_STATE_ARG
98# define LZF_STATE_ARG 0 110# define LZF_STATE_ARG 0
111#endif
112
113/*
114 * Wether to add extra checks for input validity in lzf_decompress
115 * and return EINVAL if the input stream has been corrupted. This
116 * only shields against overflowing the input buffer and will not
117 * detect most corrupted streams.
118 * This check is not normally noticable on modern hardware
119 * (<1% slowdown), but might slow down older cpus considerably.
120 */
121#ifndef CHECK_INPUT
122# define CHECK_INPUT 1
99#endif 123#endif
100 124
101/*****************************************************************************/ 125/*****************************************************************************/
102/* nothing should be changed below */ 126/* nothing should be changed below */
103 127
… …
116# undef STRICT_ALIGN 140# undef STRICT_ALIGN
117# define STRICT_ALIGN 1 141# define STRICT_ALIGN 1
118# endif 142# endif
119#endif 143#endif
120 144
121#if USE_MEMCPY || INIT_HTAB 145#if ULTRA_FAST
146# if defined(VERY_FAST)
147# undef VERY_FAST
148# endif
149#endif
150
151#if INIT_HTAB
152# ifdef __cplusplus
153# include <cstring>
154# else
122# include <string.h> 155# include <string.h>
156# endif
123#endif 157#endif
124 158
125#endif 159#endif
126 160

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