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/cvs/liblzf/lzfP.h
Revision: 1.5
Committed: Tue Dec 23 04:52:00 2003 UTC (20 years, 4 months ago) by pcg
Content type: text/plain
Branch: MAIN
Changes since 1.4: +19 -1 lines
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File Contents

# User Rev Content
1 root 1.1 /*
2 pcg 1.5 * Copyright (c) 2000-2003 Marc Alexander Lehmann <pcg@goof.com>
3 root 1.1 *
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    
29     #ifndef LZFP_h
30     #define LZFP_h
31    
32     #define STANDALONE /* at the moment, this is ok. */
33    
34     #ifndef STANDALONE
35     # include "lzf.h"
36     #endif
37    
38     /*
39     * size of hashtable is (1 << HLOG) * sizeof (char *)
40     * decompression is independent of the hash table size
41     * the difference between 15 and 14 is very small
42     * for small blocks (and 14 is also faster).
43     * For a low-memory configuration, use HLOG == 13;
44     * For best compression, use 15 or 16.
45     */
46     #ifndef HLOG
47     # define HLOG 14
48     #endif
49    
50     /*
51     * sacrifice some compression quality in favour of compression speed.
52     * (roughly 1-2% worse compression for large blocks and
53 root 1.2 * 9-10% for small, redundant, blocks and >>20% better speed in both cases)
54 root 1.1 * In short: enable this for binary data, disable this for text data.
55     */
56     #ifndef ULTRA_FAST
57     # define ULTRA_FAST 1
58     #endif
59    
60     /*
61     * unconditionally aligning does not cost very much, so do it if unsure
62     */
63     #ifndef STRICT_ALIGN
64     # define STRICT_ALIGN !defined(__i386)
65     #endif
66    
67     /*
68     * use string functions to copy memory.
69     * this is usually a loss, even with glibc's optimized memcpy
70     */
71     #ifndef USE_MEMCPY
72     # define USE_MEMCPY 0
73     #endif
74    
75     /*
76     * you may choose to pre-set the hash table (might be faster on modern cpus
77     * and large (>>64k) blocks)
78     */
79     #ifndef INIT_HTAB
80     # define INIT_HTAB 0
81     #endif
82    
83 pcg 1.5 /*
84     * avoid assigning values to errno variable? for some embedding purposes
85     * (linux kernel for example), this is not
86     */
87     #ifndef AVOID_ERRNO
88     # define AVOID_ERRNO 0
89     #endif
90    
91     /*
92     * Wether to pass the LZF_STATE variable as argument, or allocate it
93     * on the stack. For small-stack environments, define this to zero.
94     */
95     #ifndef LZF_STATE_ARG
96     # define LZF_STATE_ARG 1
97     #endif
98    
99 root 1.1 /*****************************************************************************/
100     /* nothing should be changed below */
101    
102     typedef unsigned char u8;
103 pcg 1.5
104     typedef const u8 *LZF_STATE[1 << (HLOG)];
105 root 1.1
106     #if !STRICT_ALIGN
107     /* for unaligned accesses we need a 16 bit datatype. */
108     # include <limits.h>
109     # if USHRT_MAX == 65535
110     typedef unsigned short u16;
111     # elif UINT_MAX == 65535
112     typedef unsigned int u16;
113     # else
114     # undef STRICT_ALIGN
115     # define STRICT_ALIGN 1
116     # endif
117     #endif
118    
119     #if USE_MEMCPY || INIT_HTAB
120     # include <string.h>
121     #endif
122    
123     #endif
124