97 lines
4.1 KiB
C
97 lines
4.1 KiB
C
/* ******************************************************************
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Huff0 : Huffman coder, part of New Generation Entropy library
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header file
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Copyright (C) 2013-2015, 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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- Source repository : https://github.com/Cyan4973/FiniteStateEntropy
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- Public forum : https://groups.google.com/forum/#!forum/lz4c
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****************************************************************** */
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#ifndef HUFF0_H
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#define HUFF0_H
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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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* Dependency
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******************************************/
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#include <stddef.h> /* size_t */
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/******************************************
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* Huff0 simple functions
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******************************************/
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size_t HUF_compress(void* dst, size_t maxDstSize,
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const void* src, size_t srcSize);
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size_t HUF_decompress(void* dst, size_t dstSize,
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const void* cSrc, size_t cSrcSize);
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/*
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HUF_compress():
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Compress content of buffer 'src', of size 'srcSize', into destination buffer 'dst'.
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'dst' buffer must be already allocated. Compression runs faster if maxDstSize >= HUF_compressBound(srcSize).
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Note : srcSize must be <= 128 KB
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return : size of compressed data (<= maxDstSize)
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Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!!
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if return == 1, srcData is a single repeated byte symbol (RLE compression)
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if HUF_isError(return), compression failed (more details using HUF_getErrorName())
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HUF_decompress():
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Decompress Huff0 data from buffer 'cSrc', of size 'cSrcSize',
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into already allocated destination buffer 'dst', of size 'dstSize'.
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'dstSize' must be the exact size of original (uncompressed) data.
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Note : in contrast with FSE, HUF_decompress can regenerate RLE (cSrcSize==1) and uncompressed (cSrcSize==dstSize) data, because it knows size to regenerate.
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return : size of regenerated data (== dstSize)
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or an error code, which can be tested using HUF_isError()
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*/
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/******************************************
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* Tool functions
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******************************************/
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size_t HUF_compressBound(size_t size); /* maximum compressed size */
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/* Error Management */
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unsigned HUF_isError(size_t code); /* tells if a return value is an error code */
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const char* HUF_getErrorName(size_t code); /* provides error code string (useful for debugging) */
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/******************************************
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* Advanced functions
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******************************************/
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size_t HUF_compress2 (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog);
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#if defined (__cplusplus)
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}
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#endif
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#endif /* HUFF0_H */
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