e898c9a79a
Corrected issue 60 in lz4.h, reported by Takayuki Matsuoka Added : a cmake/pack installer, by Dmitry Cherepanov git-svn-id: https://lz4.googlecode.com/svn/trunk@89 650e7d94-2a16-8b24-b05c-7c0b3f6821cd
129 lines
5.4 KiB
C
129 lines
5.4 KiB
C
/*
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LZ4 - Fast LZ compression algorithm
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Header File
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Copyright (C) 2011-2012, Yann Collet.
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BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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You can contact the author at :
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- LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
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- LZ4 source repository : http://code.google.com/p/lz4/
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*/
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#pragma once
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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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// Compiler Options
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//**************************************
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#if defined(_MSC_VER) && !defined(__cplusplus) // Visual Studio
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# define inline __inline // Visual is not C99, but supports some kind of inline
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#endif
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//****************************
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// Simple Functions
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//****************************
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int LZ4_compress (const char* source, char* dest, int isize);
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int LZ4_uncompress (const char* source, char* dest, int osize);
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/*
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LZ4_compress() :
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Compresses 'isize' bytes from 'source' into 'dest'.
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Destination buffer must be already allocated,
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and must be sized to handle worst cases situations (input data not compressible)
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Worst case size evaluation is provided by function LZ4_compressBound()
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isize : is the input size. Max supported value is ~1.9GB
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return : the number of bytes written in buffer dest
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LZ4_uncompress() :
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osize : is the output size, therefore the original size
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return : the number of bytes read in the source buffer
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If the source stream is malformed, the function will stop decoding and return a negative result, indicating the byte position of the faulty instruction
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This function never writes outside of provided buffers, and never modifies input buffer.
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note : destination buffer must be already allocated.
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its size must be a minimum of 'osize' bytes.
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*/
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//****************************
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// Advanced Functions
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//****************************
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static inline int LZ4_compressBound(int isize) { return ((isize) + ((isize)/255) + 16); }
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#define LZ4_COMPRESSBOUND( isize) ((isize) + ((isize)/255) + 16)
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/*
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LZ4_compressBound() :
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Provides the maximum size that LZ4 may output in a "worst case" scenario (input data not compressible)
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primarily useful for memory allocation of output buffer.
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inline function is recommended for the general case,
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but macro is also provided when results need to be evaluated at compile time (such as table size allocation).
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isize : is the input size. Max supported value is ~1.9GB
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return : maximum output size in a "worst case" scenario
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note : this function is limited by "int" range (2^31-1)
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*/
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int LZ4_compress_limitedOutput (const char* source, char* dest, int isize, int maxOutputSize);
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/*
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LZ4_compress_limitedOutput() :
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Compress 'isize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
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If it cannot achieve it, compression will stop, and result of the function will be zero.
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This function never writes outside of provided output buffer.
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isize : is the input size. Max supported value is ~1.9GB
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maxOutputSize : is the size of the destination buffer (which must be already allocated)
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return : the number of bytes written in buffer 'dest'
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or 0 if the compression fails
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*/
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int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
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/*
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LZ4_uncompress_unknownOutputSize() :
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isize : is the input size, therefore the compressed size
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maxOutputSize : is the size of the destination buffer (which must be already allocated)
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return : the number of bytes decoded in the destination buffer (necessarily <= maxOutputSize)
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If the source stream is malformed, the function will stop decoding and return a negative result, indicating the byte position of the faulty instruction
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This function never writes beyond dest + maxOutputSize, and is therefore protected against malicious data packets
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note : Destination buffer must be already allocated.
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This version is slightly slower than LZ4_uncompress()
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*/
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#if defined (__cplusplus)
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}
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#endif
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