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75 lines
2.7 KiB
C
75 lines
2.7 KiB
C
// SONIC ROBO BLAST 2
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//-----------------------------------------------------------------------------
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// Copyright (C) 2000-2005 by Marc Alexander Lehmann <schmorp@schmorp.de>
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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// See the 'LICENSE' file for more details.
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//-----------------------------------------------------------------------------
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/// \file lzf.h
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/// \brief LZF de/compression routines
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#ifndef LZF_H
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#define LZF_H
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#include <stdio.h>
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/***********************************************************************
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**
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** lzf -- an extremely fast/free compression/decompression-method
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** http://liblzf.plan9.de/
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**
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** This algorithm is believed to be patent-free.
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**
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***********************************************************************/
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#define LZF_VERSION 0x0105 /* 1.5 */
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/*
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* Compress in_len bytes stored at the memory block starting at
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* in_data and write the result to out_data, up to a maximum length
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* of out_len bytes.
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*
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* If the output buffer is not large enough or any error occurs
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* return 0, otherwise return the number of bytes used (which might
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* be considerably larger than in_len, so it makes sense to always
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* use out_len == in_len - 1), to ensure _some_ compression, and store
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* the data uncompressed otherwise.
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*
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* lzf_compress might use different algorithms on different systems and
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* even diferent runs, thus might result in different compressed strings
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* depending on the phase of the moon or similar factors. However, all
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* these strings are architecture-independent and will result in the
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* original data when decompressed using lzf_decompress.
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*
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* The buffers must not be overlapping.
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*
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* If the option LZF_STATE_ARG is enabled, an extra argument must be
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* supplied which is not reflected in this header file. Refer to lzfP.h
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* and lzf_c.c.
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*
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*/
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size_t
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lzf_compress (const void *const in_data, size_t in_len,
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void *out_data, size_t out_len);
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/*
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* Decompress data compressed with some version of the lzf_compress
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* function and stored at location in_data and length in_len. The result
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* will be stored at out_data up to a maximum of out_len characters.
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*
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* If the output buffer is not large enough to hold the decompressed
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* data, a 0 is returned and errno is set to E2BIG. Otherwise the number
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* of decompressed bytes (i.e. the original length of the data) is
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* returned.
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*
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* If an error in the compressed data is detected, a zero is returned and
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* errno is set to EINVAL.
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*
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* This function is very fast, about as fast as a copying loop.
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*/
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size_t
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lzf_decompress (const void *const in_data, size_t in_len,
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void *out_data, size_t out_len);
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#endif
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