1 |
/* |
2 |
* Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com> |
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 |
* 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 |
18 |
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
19 |
* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
20 |
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
21 |
* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
22 |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
23 |
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
24 |
* 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 |
26 |
* OF THE POSSIBILITY OF SUCH DAMAGE. |
27 |
* |
28 |
* Alternatively, the contents of this file may be used under the terms of |
29 |
* the GNU General Public License version 2 (the "GPL"), in which case the |
30 |
* provisions of the GPL are applicable instead of the above. If you wish to |
31 |
* allow the use of your version of this file only under the terms of the |
32 |
* GPL and not to allow others to use your version of this file under the |
33 |
* BSD license, indicate your decision by deleting the provisions above and |
34 |
* replace them with the notice and other provisions required by the GPL. If |
35 |
* you do not delete the provisions above, a recipient may use your version |
36 |
* of this file under either the BSD or the GPL. |
37 |
*/ |
38 |
|
39 |
#ifndef LZFP_h |
40 |
#define LZFP_h |
41 |
|
42 |
#define STANDALONE /* at the moment, this is ok. */ |
43 |
|
44 |
#ifndef STANDALONE |
45 |
# include "lzf.h" |
46 |
#endif |
47 |
|
48 |
/* |
49 |
* size of hashtable is (1 << HLOG) * sizeof (char *) |
50 |
* decompression is independent of the hash table size |
51 |
* the difference between 15 and 14 is very small |
52 |
* for small blocks (and 14 is also faster). |
53 |
* For a low-memory configuration, use HLOG == 13; |
54 |
* For best compression, use 15 or 16. |
55 |
*/ |
56 |
#ifndef HLOG |
57 |
# define HLOG 14 |
58 |
#endif |
59 |
|
60 |
/* |
61 |
* sacrifice some compression quality in favour of compression speed. |
62 |
* (roughly 1-2% worse compression for large blocks and |
63 |
* 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. |
65 |
*/ |
66 |
#ifndef ULTRA_FAST |
67 |
# define ULTRA_FAST 1 |
68 |
#endif |
69 |
|
70 |
/* |
71 |
* unconditionally aligning does not cost very much, so do it if unsure |
72 |
*/ |
73 |
#ifndef STRICT_ALIGN |
74 |
# define STRICT_ALIGN !defined(__i386) |
75 |
#endif |
76 |
|
77 |
/* |
78 |
* use string functions to copy memory. |
79 |
* this is usually a loss, even with glibc's optimized memcpy |
80 |
*/ |
81 |
#ifndef USE_MEMCPY |
82 |
# define USE_MEMCPY 0 |
83 |
#endif |
84 |
|
85 |
/* |
86 |
* you may choose to pre-set the hash table (might be faster on modern cpus |
87 |
* and large (>>64k) blocks) |
88 |
*/ |
89 |
#ifndef INIT_HTAB |
90 |
# define INIT_HTAB 0 |
91 |
#endif |
92 |
|
93 |
/* |
94 |
* avoid assigning values to errno variable? for some embedding purposes |
95 |
* (linux kernel for example), this is neccessary. NOTE: this breaks |
96 |
* the documentation in lzf.h. |
97 |
*/ |
98 |
#ifndef AVOID_ERRNO |
99 |
# define AVOID_ERRNO 0 |
100 |
#endif |
101 |
|
102 |
/* |
103 |
* Wether to pass the LZF_STATE variable as argument, or allocate it |
104 |
* on the stack. For small-stack environments, define this to 1. |
105 |
* NOTE: this breaks the prototype in lzf.h. |
106 |
*/ |
107 |
#ifndef LZF_STATE_ARG |
108 |
# define LZF_STATE_ARG 0 |
109 |
#endif |
110 |
|
111 |
/*****************************************************************************/ |
112 |
/* nothing should be changed below */ |
113 |
|
114 |
typedef unsigned char u8; |
115 |
|
116 |
typedef const u8 *LZF_STATE[1 << (HLOG)]; |
117 |
|
118 |
#if !STRICT_ALIGN |
119 |
/* for unaligned accesses we need a 16 bit datatype. */ |
120 |
# include <limits.h> |
121 |
# if USHRT_MAX == 65535 |
122 |
typedef unsigned short u16; |
123 |
# elif UINT_MAX == 65535 |
124 |
typedef unsigned int u16; |
125 |
# else |
126 |
# undef STRICT_ALIGN |
127 |
# define STRICT_ALIGN 1 |
128 |
# endif |
129 |
#endif |
130 |
|
131 |
#if USE_MEMCPY || INIT_HTAB |
132 |
# include <string.h> |
133 |
#endif |
134 |
|
135 |
#endif |
136 |
|