| 1 | /*
|
|---|
| 2 | * Copyright (c) 2000-2008 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 LZF_H
|
|---|
| 38 | #define LZF_H
|
|---|
| 39 |
|
|---|
| 40 | #ifdef __cplusplus /* vbox */
|
|---|
| 41 | extern "C" { /* vbox */
|
|---|
| 42 | #endif /* vbox */
|
|---|
| 43 |
|
|---|
| 44 | /***********************************************************************
|
|---|
| 45 | **
|
|---|
| 46 | ** lzf -- an extremely fast/free compression/decompression-method
|
|---|
| 47 | ** http://liblzf.plan9.de/
|
|---|
| 48 | **
|
|---|
| 49 | ** This algorithm is believed to be patent-free.
|
|---|
| 50 | **
|
|---|
| 51 | ***********************************************************************/
|
|---|
| 52 |
|
|---|
| 53 | #define LZF_VERSION 0x0105 /* 1.5, API version */
|
|---|
| 54 |
|
|---|
| 55 | /*
|
|---|
| 56 | * Compress in_len bytes stored at the memory block starting at
|
|---|
| 57 | * in_data and write the result to out_data, up to a maximum length
|
|---|
| 58 | * of out_len bytes.
|
|---|
| 59 | *
|
|---|
| 60 | * If the output buffer is not large enough or any error occurs return 0,
|
|---|
| 61 | * otherwise return the number of bytes used, which might be considerably
|
|---|
| 62 | * more than in_len (but less than 104% of the original size), so it
|
|---|
| 63 | * makes sense to always use out_len == in_len - 1), to ensure _some_
|
|---|
| 64 | * compression, and store the data uncompressed otherwise (with a flag, of
|
|---|
| 65 | * course.
|
|---|
| 66 | *
|
|---|
| 67 | * lzf_compress might use different algorithms on different systems and
|
|---|
| 68 | * even different runs, thus might result in different compressed strings
|
|---|
| 69 | * depending on the phase of the moon or similar factors. However, all
|
|---|
| 70 | * these strings are architecture-independent and will result in the
|
|---|
| 71 | * original data when decompressed using lzf_decompress.
|
|---|
| 72 | *
|
|---|
| 73 | * The buffers must not be overlapping.
|
|---|
| 74 | *
|
|---|
| 75 | * If the option LZF_STATE_ARG is enabled, an extra argument must be
|
|---|
| 76 | * supplied which is not reflected in this header file. Refer to lzfP.h
|
|---|
| 77 | * and lzf_c.c.
|
|---|
| 78 | *
|
|---|
| 79 | */
|
|---|
| 80 | unsigned int
|
|---|
| 81 | lzf_compress (const void *const in_data, unsigned int in_len,
|
|---|
| 82 | void *out_data, unsigned int out_len);
|
|---|
| 83 |
|
|---|
| 84 | /*
|
|---|
| 85 | * Decompress data compressed with some version of the lzf_compress
|
|---|
| 86 | * function and stored at location in_data and length in_len. The result
|
|---|
| 87 | * will be stored at out_data up to a maximum of out_len characters.
|
|---|
| 88 | *
|
|---|
| 89 | * If the output buffer is not large enough to hold the decompressed
|
|---|
| 90 | * data, a 0 is returned and errno is set to E2BIG. Otherwise the number
|
|---|
| 91 | * of decompressed bytes (i.e. the original length of the data) is
|
|---|
| 92 | * returned.
|
|---|
| 93 | *
|
|---|
| 94 | * If an error in the compressed data is detected, a zero is returned and
|
|---|
| 95 | * errno is set to EINVAL.
|
|---|
| 96 | *
|
|---|
| 97 | * This function is very fast, about as fast as a copying loop.
|
|---|
| 98 | */
|
|---|
| 99 | unsigned int
|
|---|
| 100 | lzf_decompress (const void *const in_data, unsigned int in_len,
|
|---|
| 101 | void *out_data, unsigned int out_len);
|
|---|
| 102 |
|
|---|
| 103 | #ifdef __cplusplus /* vbox */
|
|---|
| 104 | } /* vbox */
|
|---|
| 105 | #endif /* vbox */
|
|---|
| 106 | #endif
|
|---|
| 107 |
|
|---|
