d0751937 |
1 | /* |
2 | * Copyright (c) 2000-2007 Marc Alexander Lehmann <schmorp@schmorp.de> |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without modifica- |
5 | * tion, are permitted provided that the following conditions are met: |
6 | * |
7 | * 1. Redistributions of source code must retain the above copyright notice, |
8 | * this list of conditions and the following disclaimer. |
9 | * |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
16 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
17 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
18 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
20 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
21 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
22 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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. |
35 | */ |
36 | |
37 | #ifndef LZFP_h |
38 | #define LZFP_h |
39 | |
40 | #define STANDALONE 1 /* at the moment, this is ok. */ |
41 | |
42 | #ifndef STANDALONE |
43 | # include "lzf.h" |
44 | #endif |
45 | |
46 | /* |
47 | * Size of hashtable is (1 << HLOG) * sizeof (char *) |
48 | * decompression is independent of the hash table size |
49 | * the difference between 15 and 14 is very small |
50 | * for small blocks (and 14 is usually a bit faster). |
51 | * For a low-memory/faster configuration, use HLOG == 13; |
52 | * For best compression, use 15 or 16 (or more, up to 23). |
53 | */ |
54 | #ifndef HLOG |
55 | # define HLOG 16 |
56 | #endif |
57 | |
58 | /* |
59 | * Sacrifice very little compression quality in favour of compression speed. |
60 | * This gives almost the same compression as the default code, and is |
61 | * (very roughly) 15% faster. This is the preferred mode of operation. |
62 | */ |
63 | #ifndef VERY_FAST |
64 | # define VERY_FAST 1 |
65 | #endif |
66 | |
67 | /* |
68 | * Sacrifice some more compression quality in favour of compression speed. |
69 | * (roughly 1-2% worse compression for large blocks and |
70 | * 9-10% for small, redundant, blocks and >>20% better speed in both cases) |
71 | * In short: when in need for speed, enable this for binary data, |
72 | * possibly disable this for text data. |
73 | */ |
74 | #ifndef ULTRA_FAST |
75 | # define ULTRA_FAST 0 |
76 | #endif |
77 | |
78 | /* |
79 | * Unconditionally aligning does not cost very much, so do it if unsure |
80 | */ |
81 | #ifndef STRICT_ALIGN |
82 | # define STRICT_ALIGN !(defined(__i386) || defined (__amd64)) |
83 | #endif |
84 | |
85 | /* |
86 | * You may choose to pre-set the hash table (might be faster on some |
87 | * modern cpus and large (>>64k) blocks, and also makes compression |
88 | * deterministic/repeatable when the configuration otherwise is the same). |
89 | */ |
90 | #ifndef INIT_HTAB |
b0553789 |
91 | # define INIT_HTAB 0 |
d0751937 |
92 | #endif |
93 | |
94 | /* |
95 | * Avoid assigning values to errno variable? for some embedding purposes |
96 | * (linux kernel for example), this is neccessary. NOTE: this breaks |
97 | * the documentation in lzf.h. |
98 | */ |
99 | #ifndef AVOID_ERRNO |
100 | # define AVOID_ERRNO 0 |
101 | #endif |
102 | |
103 | /* |
104 | * Wether to pass the LZF_STATE variable as argument, or allocate it |
105 | * on the stack. For small-stack environments, define this to 1. |
106 | * NOTE: this breaks the prototype in lzf.h. |
107 | */ |
108 | #ifndef LZF_STATE_ARG |
109 | # define LZF_STATE_ARG 0 |
110 | #endif |
111 | |
112 | /* |
113 | * Wether to add extra checks for input validity in lzf_decompress |
114 | * and return EINVAL if the input stream has been corrupted. This |
115 | * only shields against overflowing the input buffer and will not |
116 | * detect most corrupted streams. |
117 | * This check is not normally noticable on modern hardware |
118 | * (<1% slowdown), but might slow down older cpus considerably. |
119 | */ |
120 | #ifndef CHECK_INPUT |
121 | # define CHECK_INPUT 1 |
122 | #endif |
123 | |
124 | /*****************************************************************************/ |
125 | /* nothing should be changed below */ |
126 | |
127 | typedef unsigned char u8; |
128 | |
129 | typedef const u8 *LZF_STATE[1 << (HLOG)]; |
130 | |
131 | #if !STRICT_ALIGN |
132 | /* for unaligned accesses we need a 16 bit datatype. */ |
133 | # include <limits.h> |
134 | # if USHRT_MAX == 65535 |
135 | typedef unsigned short u16; |
136 | # elif UINT_MAX == 65535 |
137 | typedef unsigned int u16; |
138 | # else |
139 | # undef STRICT_ALIGN |
140 | # define STRICT_ALIGN 1 |
141 | # endif |
142 | #endif |
143 | |
144 | #if ULTRA_FAST |
145 | # if defined(VERY_FAST) |
146 | # undef VERY_FAST |
147 | # endif |
148 | #endif |
149 | |
150 | #if INIT_HTAB |
151 | # ifdef __cplusplus |
152 | # include <cstring> |
153 | # else |
154 | # include <string.h> |
155 | # endif |
156 | #endif |
157 | |
158 | #endif |
159 | |