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99 lines
3.9 KiB
C
99 lines
3.9 KiB
C
/*
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* Copyright (c) 2009 Andrew Collette <andrew.collette at gmail.com>
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* http://lzfx.googlecode.com
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*
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* Implements an LZF-compatible compressor/decompressor based on the liblzf
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* codebase written by Marc Lehmann. This code is released under the BSD
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* license. License and original copyright statement follow.
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*
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*
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* Copyright (c) 2000-2008 Marc Alexander Lehmann <schmorp@schmorp.de>
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*
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* Redistribution and use in source and binary forms, with or without modifica-
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* tion, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef LZFX_H
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#define LZFX_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* Documented behavior, including function signatures and error codes,
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is guaranteed to remain unchanged for releases with the same major
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version number. Releases of the same major version are also able
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to read each other's output, although the output itself is not
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guaranteed to be byte-for-byte identical.
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*/
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#define LZFX_VERSION_MAJOR 0
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#define LZFX_VERSION_MINOR 1
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#define LZFX_VERSION_STRING "0.1"
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/* Hashtable size (2**LZFX_HLOG entries) */
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#ifndef LZFX_HLOG
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#define LZFX_HLOG 16
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#endif
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/* Predefined errors. */
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#define LZFX_ESIZE -1 /* Output buffer too small */
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#define LZFX_ECORRUPT -2 /* Invalid data for decompression */
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#define LZFX_EARGS -3 /* Arguments invalid (NULL) */
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/* Buffer-to buffer compression.
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Supply pre-allocated input and output buffers via ibuf and obuf, and
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their size in bytes via ilen and olen. Buffers may not overlap.
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On success, the function returns a non-negative value and the argument
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olen contains the compressed size in bytes. On failure, a negative
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value is returned and olen is not modified.
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*/
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int lzfx_compress(const void *ibuf, unsigned int ilen,
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void *obuf, unsigned int *olen);
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/* Buffer-to-buffer decompression.
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Supply pre-allocated input and output buffers via ibuf and obuf, and
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their size in bytes via ilen and olen. Buffers may not overlap.
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On success, the function returns a non-negative value and the argument
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olen contains the uncompressed size in bytes. On failure, a negative
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value is returned.
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If the failure code is LZFX_ESIZE, olen contains the minimum buffer size
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required to hold the decompressed data. Otherwise, olen is not modified.
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Supplying a zero *olen is a valid and supported strategy to determine the
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required buffer size. This does not require decompression of the entire
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stream and is consequently very fast. Argument obuf may be NULL in
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this case only.
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*/
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int lzfx_decompress(const void *ibuf, unsigned int ilen,
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void *obuf, unsigned int *olen);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif
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