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Revision: 1.7
Committed: Tue Apr 20 18:11:57 2004 UTC (20 years, 5 months ago) by pcg
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Branch: MAIN
Changes since 1.6: +10 -0 lines
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# Content
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 LZF_H
40 #define LZF_H
41
42 /***********************************************************************
43 **
44 ** lzf -- an extremely fast/free compression/decompression-method
45 ** http://liblzf.plan9.de/
46 **
47 ** This algorithm is believed to be patent-free.
48 **
49 ***********************************************************************/
50
51 /*
52 * Compress in_len bytes stored at the memory block starting at
53 * in_data and write the result to out_data, up to a maximum length
54 * of out_len bytes.
55 *
56 * If the output buffer is not large enough or any error occurs
57 * return 0, otherwise return the number of bytes used (which might
58 * be considerably larger than in_len, so it makes sense to always
59 * use out_len == in_len).
60 *
61 * lzf_compress might use different algorithms on different systems and
62 * thus might result in different compressed strings depending on the
63 * phase of the moon or similar factors. However, all these strings are
64 * architecture-independent and will result in the original data when
65 * decompressed using lzf_decompress.
66 *
67 * The buffers must not be overlapping.
68 *
69 * If the option LZF_STATE_ARG is enabled, an extra argument must be
70 * supplied which is not reflected in this header file. Refer to lzf_c.c.
71 *
72 */
73 unsigned int
74 lzf_compress (const void *const in_data, unsigned int in_len,
75 void *out_data, unsigned int out_len);
76
77 /*
78 * Decompress data compressed with some version of the lzf_compress
79 * function and stored at location in_data and length in_len. The result
80 * will be stored at out_data up to a maximum of out_len characters.
81 *
82 * If the output buffer is not large enough to hold the decompressed
83 * data, a 0 is returned and errno is set to E2BIG. Otherwise the number
84 * of decompressed bytes (i.e. the original length of the data) is
85 * returned.
86 *
87 * If an error in the compressed data is detected, a zero is returned and
88 * errno is set to EINVAL.
89 *
90 * This function is very fast, about as fast as a copying loop.
91 */
92 unsigned int
93 lzf_decompress (const void *const in_data, unsigned int in_len,
94 void *out_data, unsigned int out_len);
95
96 #endif
97