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Comparing liblzf/lzfP.h (file contents):
Revision 1.10 by root, Thu Mar 3 17:06:44 2005 UTC vs.
Revision 1.11 by root, Tue Mar 8 19:59:52 2005 UTC

… …
37 */ 37 */
38 38
39#ifndef LZFP_h 39#ifndef LZFP_h
40#define LZFP_h 40#define LZFP_h
41 41
42#define STANDALONE /* at the moment, this is ok. */ 42#define STANDALONE 1 /* at the moment, this is ok. */
43 43
44#ifndef STANDALONE 44#ifndef STANDALONE
45# include "lzf.h" 45# include "lzf.h"
46#endif 46#endif
47 47
48/* 48/*
49 * size of hashtable is (1 << HLOG) * sizeof (char *) 49 * size of hashtable is (1 << HLOG) * sizeof (char *)
50 * decompression is independent of the hash table size 50 * decompression is independent of the hash table size
51 * the difference between 15 and 14 is very small 51 * the difference between 15 and 14 is very small
52 * for small blocks (and 14 is also faster). 52 * for small blocks (and 14 is usually a but faster).
53 * For a low-memory configuration, use HLOG == 13; 53 * For a low-memory/faster configuration, use HLOG == 13;
54 * For best compression, use 15 or 16. 54 * For best compression, use 15 or 16 (or more).
55 */ 55 */
56#ifndef HLOG 56#ifndef HLOG
57# define HLOG 14 57# define HLOG 14
58#endif 58#endif
59 59
60/* 60/*
61 * sacrifice very little compression quality in favour of compression speed.
62 * This gives almost the same compression as the default code, and is
63 * (very roughly) 15% faster. This is the preferable mode of operation.
64 */
65
66#ifndef VERY_FAST
67# define VERY_FAST 1
68#endif
69
70/*
61 * sacrifice some compression quality in favour of compression speed. 71 * sacrifice some more compression quality in favour of compression speed.
62 * (roughly 1-2% worse compression for large blocks and 72 * (roughly 1-2% worse compression for large blocks and
63 * 9-10% for small, redundant, blocks and >>20% better speed in both cases) 73 * 9-10% for small, redundant, blocks and >>20% better speed in both cases)
64 * In short: enable this for binary data, disable this for text data. 74 * In short: when in need for speed, enable this for binary data,
75 * possibly disable this for text data.
65 */ 76 */
66#ifndef ULTRA_FAST 77#ifndef ULTRA_FAST
67# define ULTRA_FAST 1 78# define ULTRA_FAST 0
68#endif 79#endif
69 80
70/* 81/*
71 * unconditionally aligning does not cost very much, so do it if unsure 82 * unconditionally aligning does not cost very much, so do it if unsure
72 */ 83 */
73#ifndef STRICT_ALIGN 84#ifndef STRICT_ALIGN
74# define STRICT_ALIGN !defined(__i386) 85# define STRICT_ALIGN !(defined(__i386) || defined (__amd64))
75#endif 86#endif
76 87
77/* 88/*
78 * use string functions to copy memory. 89 * use string functions to copy memory.
79 * this is usually a loss, even with glibc's optimized memcpy 90 * this is usually a loss, even with glibc's optimized memcpy
… …
81#ifndef USE_MEMCPY 92#ifndef USE_MEMCPY
82# define USE_MEMCPY 0 93# define USE_MEMCPY 0
83#endif 94#endif
84 95
85/* 96/*
86 * you may choose to pre-set the hash table (might be faster on modern cpus 97 * you may choose to pre-set the hash table (might be faster on some
87 * and large (>>64k) blocks) 98 * modern cpus and large (>>64k) blocks)
88 */ 99 */
89#ifndef INIT_HTAB 100#ifndef INIT_HTAB
90# define INIT_HTAB 0 101# define INIT_HTAB 0
91#endif 102#endif
92 103
… …
126# undef STRICT_ALIGN 137# undef STRICT_ALIGN
127# define STRICT_ALIGN 1 138# define STRICT_ALIGN 1
128# endif 139# endif
129#endif 140#endif
130 141
142#if ULTRA_FAST
143# if defined(VERY_FAST)
144# undef VERY_FAST
145# endif
146#endif
147
131#if USE_MEMCPY || INIT_HTAB 148#if USE_MEMCPY || INIT_HTAB
132# ifdef __cplusplus 149# ifdef __cplusplus
133# include <cstring> 150# include <cstring>
134# else 151# else
135# include <string.h> 152# include <string.h>

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