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5167c9186a
Upstream development restarted after 13 years. Changes:
2020-02-02: Version 0.5.0
Minor speed improvement on the decompressor.
Prevent memory violation when decompressing corrupted input.
2020-01-10: Version 0.4.0
Only code & infrastructure clean-up, no new functionality.
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
/*
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FastLZ - Byte-aligned LZ77 compression library
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Copyright (C) 2005-2020 Ariya Hidayat <ariya.hidayat@gmail.com>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#ifndef FASTLZ_H
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#define FASTLZ_H
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#define FASTLZ_VERSION 0x000500
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#define FASTLZ_VERSION_MAJOR 0
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#define FASTLZ_VERSION_MINOR 5
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#define FASTLZ_VERSION_REVISION 0
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#define FASTLZ_VERSION_STRING "0.5.0"
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/**
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Compress a block of data in the input buffer and returns the size of
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compressed block. The size of input buffer is specified by length. The
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minimum input buffer size is 16.
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The output buffer must be at least 5% larger than the input buffer
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and can not be smaller than 66 bytes.
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If the input is not compressible, the return value might be larger than
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length (input buffer size).
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The input buffer and the output buffer can not overlap.
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Compression level can be specified in parameter level. At the moment,
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only level 1 and level 2 are supported.
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Level 1 is the fastest compression and generally useful for short data.
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Level 2 is slightly slower but it gives better compression ratio.
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Note that the compressed data, regardless of the level, can always be
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decompressed using the function fastlz_decompress below.
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*/
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int fastlz_compress_level(int level, const void* input, int length,
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void* output);
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/**
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Decompress a block of compressed data and returns the size of the
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decompressed block. If error occurs, e.g. the compressed data is
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corrupted or the output buffer is not large enough, then 0 (zero)
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will be returned instead.
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The input buffer and the output buffer can not overlap.
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Decompression is memory safe and guaranteed not to write the output buffer
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more than what is specified in maxout.
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Note that the decompression will always work, regardless of the
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compression level specified in fastlz_compress_level above (when
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producing the compressed block).
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*/
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int fastlz_decompress(const void* input, int length, void* output, int maxout);
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/**
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DEPRECATED.
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This is similar to fastlz_compress_level above, but with the level
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automatically chosen.
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This function is deprecated and it will be completely removed in some future
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version.
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*/
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int fastlz_compress(const void* input, int length, void* output);
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#if defined(__cplusplus)
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}
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#endif
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#endif /* FASTLZ_H */
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