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Comparing liblzf/lzfP.h (file contents):
Revision 1.17 by root, Mon Nov 5 23:28:40 2007 UTC vs.
Revision 1.22 by root, Tue Jun 1 03:17:06 2010 UTC

… …
47 * Size of hashtable is (1 << HLOG) * sizeof (char *) 47 * Size of hashtable is (1 << HLOG) * sizeof (char *)
48 * decompression is independent of the hash table size 48 * decompression is independent of the hash table size
49 * the difference between 15 and 14 is very small 49 * the difference between 15 and 14 is very small
50 * for small blocks (and 14 is usually a bit faster). 50 * for small blocks (and 14 is usually a bit faster).
51 * For a low-memory/faster configuration, use HLOG == 13; 51 * For a low-memory/faster configuration, use HLOG == 13;
52 * For best compression, use 15 or 16 (or more). 52 * For best compression, use 15 or 16 (or more, up to 23).
53 */ 53 */
54#ifndef HLOG 54#ifndef HLOG
55# define HLOG 15 55# define HLOG 16
56#endif 56#endif
57 57
58/* 58/*
59 * Sacrifice very little compression quality in favour of compression speed. 59 * Sacrifice very little compression quality in favour of compression speed.
60 * This gives almost the same compression as the default code, and is 60 * This gives almost the same compression as the default code, and is
61 * (very roughly) 15% faster. This is the preferable mode of operation. 61 * (very roughly) 15% faster. This is the preferred mode of operation.
62 */ 62 */
63
64#ifndef VERY_FAST 63#ifndef VERY_FAST
65# define VERY_FAST 1 64# define VERY_FAST 1
66#endif 65#endif
67 66
68/* 67/*
… …
92# define INIT_HTAB 0 91# define INIT_HTAB 0
93#endif 92#endif
94 93
95/* 94/*
96 * Avoid assigning values to errno variable? for some embedding purposes 95 * Avoid assigning values to errno variable? for some embedding purposes
97 * (linux kernel for example), this is neccessary. NOTE: this breaks 96 * (linux kernel for example), this is necessary. NOTE: this breaks
98 * the documentation in lzf.h. 97 * the documentation in lzf.h. Avoiding errno has no speed impact.
99 */ 98 */
100#ifndef AVOID_ERRNO 99#ifndef AVOID_ERRNO
101# define AVOID_ERRNO 0 100# define AVOID_ERRNO 0
102#endif 101#endif
103 102
104/* 103/*
105 * Wether to pass the LZF_STATE variable as argument, or allocate it 104 * Whether to pass the LZF_STATE variable as argument, or allocate it
106 * on the stack. For small-stack environments, define this to 1. 105 * on the stack. For small-stack environments, define this to 1.
107 * NOTE: this breaks the prototype in lzf.h. 106 * NOTE: this breaks the prototype in lzf.h.
108 */ 107 */
109#ifndef LZF_STATE_ARG 108#ifndef LZF_STATE_ARG
110# define LZF_STATE_ARG 0 109# define LZF_STATE_ARG 0
111#endif 110#endif
112 111
113/* 112/*
114 * Wether to add extra checks for input validity in lzf_decompress 113 * Whether to add extra checks for input validity in lzf_decompress
115 * and return EINVAL if the input stream has been corrupted. This 114 * and return EINVAL if the input stream has been corrupted. This
116 * only shields against overflowing the input buffer and will not 115 * only shields against overflowing the input buffer and will not
117 * detect most corrupted streams. 116 * detect most corrupted streams.
118 * This check is not normally noticable on modern hardware 117 * This check is not normally noticeable on modern hardware
119 * (<1% slowdown), but might slow down older cpus considerably. 118 * (<1% slowdown), but might slow down older cpus considerably.
120 */ 119 */
121#ifndef CHECK_INPUT 120#ifndef CHECK_INPUT
122# define CHECK_INPUT 1 121# define CHECK_INPUT 1
123#endif 122#endif
124 123
124/*
125 * Whether to store pointers or offsets inside the hash table. On
126 * 64 bit architetcures, pointers take up twice as much space,
127 * and might also be slower. Default is to autodetect.
128 */
129/*#define LZF_USER_OFFSETS autodetect */
130
125/*****************************************************************************/ 131/*****************************************************************************/
126/* nothing should be changed below */ 132/* nothing should be changed below */
127 133
134#ifdef __cplusplus
135# include <cstring>
136# include <climits>
137using namespace std;
138#else
139# include <string.h>
140# include <limits.h>
141#endif
142
143#ifndef LZF_USE_OFFSETS
144# if defined (WIN32)
145# define LZF_USE_OFFSETS defined(_M_X64)
146# else
147# ifdef __cplusplus
148# include <cstdint>
149# else
150# include <stdint.h>
151# endif
152# define LZF_USE_OFFSETS (UINTPTR_MAX > 0xffffffffU)
153# endif
154#endif
155
128typedef unsigned char u8; 156typedef unsigned char u8;
129 157
158#if LZF_USE_OFFSETS
159# define LZF_HSLOT_BIAS ((const u8 *)in_data)
160 typedef unsigned int LZF_HSLOT;
161#else
162# define LZF_HSLOT_BIAS 0
163 typedef const u8 *LZF_HSLOT;
164#endif
165
130typedef const u8 *LZF_STATE[1 << (HLOG)]; 166typedef LZF_HSLOT LZF_STATE[1 << (HLOG)];
131 167
132#if !STRICT_ALIGN 168#if !STRICT_ALIGN
133/* for unaligned accesses we need a 16 bit datatype. */ 169/* for unaligned accesses we need a 16 bit datatype. */
134# include <limits.h>
135# if USHRT_MAX == 65535 170# if USHRT_MAX == 65535
136 typedef unsigned short u16; 171 typedef unsigned short u16;
137# elif UINT_MAX == 65535 172# elif UINT_MAX == 65535
138 typedef unsigned int u16; 173 typedef unsigned int u16;
139# else 174# else
… …
141# define STRICT_ALIGN 1 176# define STRICT_ALIGN 1
142# endif 177# endif
143#endif 178#endif
144 179
145#if ULTRA_FAST 180#if ULTRA_FAST
146# if defined(VERY_FAST)
147# undef VERY_FAST 181# undef VERY_FAST
148# endif
149#endif
150
151#if INIT_HTAB
152# ifdef __cplusplus
153# include <cstring>
154# else
155# include <string.h>
156# endif
157#endif 182#endif
158 183
159#endif 184#endif
160 185

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