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source: vbox/trunk/src/libs/liblzf-1.51/lzf.h@ 4394

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1/*
2 * Copyright (c) 2000-2005 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 * 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 LZF_H
40#define LZF_H
41
42#ifdef __cplusplus
43extern "C" {
44#endif
45
46/***********************************************************************
47**
48** lzf -- an extremely fast/free compression/decompression-method
49** http://liblzf.plan9.de/
50**
51** This algorithm is believed to be patent-free.
52**
53***********************************************************************/
54
55#define LZF_VERSION 0x0105 /* 1.5 */
56
57/*
58 * Compress in_len bytes stored at the memory block starting at
59 * in_data and write the result to out_data, up to a maximum length
60 * of out_len bytes.
61 *
62 * If the output buffer is not large enough or any error occurs
63 * return 0, otherwise return the number of bytes used (which might
64 * be considerably larger than in_len, so it makes sense to always
65 * use out_len == in_len - 1), to ensure _some_ compression, and store
66 * the data uncompressed otherwise.
67 *
68 * lzf_compress might use different algorithms on different systems and
69 * even diferent runs, thus might result in different compressed strings
70 * depending on the phase of the moon or similar factors. However, all
71 * these strings are architecture-independent and will result in the
72 * original data when decompressed using lzf_decompress.
73 *
74 * The buffers must not be overlapping.
75 *
76 * If the option LZF_STATE_ARG is enabled, an extra argument must be
77 * supplied which is not reflected in this header file. Refer to lzfP.h
78 * and lzf_c.c.
79 *
80 */
81unsigned int
82lzf_compress (const void *const in_data, unsigned int in_len,
83 void *out_data, unsigned int out_len);
84
85/*
86 * Decompress data compressed with some version of the lzf_compress
87 * function and stored at location in_data and length in_len. The result
88 * will be stored at out_data up to a maximum of out_len characters.
89 *
90 * If the output buffer is not large enough to hold the decompressed
91 * data, a 0 is returned and errno is set to E2BIG. Otherwise the number
92 * of decompressed bytes (i.e. the original length of the data) is
93 * returned.
94 *
95 * If an error in the compressed data is detected, a zero is returned and
96 * errno is set to EINVAL.
97 *
98 * This function is very fast, about as fast as a copying loop.
99 */
100unsigned int
101lzf_decompress (const void *const in_data, unsigned int in_len,
102 void *out_data, unsigned int out_len);
103
104
105#ifdef __cplusplus
106}
107#endif
108#endif
109
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