mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-11 00:42:29 +00:00
98 lines
4.0 KiB
C
98 lines
4.0 KiB
C
/* ******************************************************************
|
|
Huff0 : Huffman coder, part of New Generation Entropy library
|
|
header file
|
|
Copyright (C) 2013-2016, Yann Collet.
|
|
|
|
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the following disclaimer
|
|
in the documentation and/or other materials provided with the
|
|
distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
You can contact the author at :
|
|
- Source repository : https://github.com/Cyan4973/FiniteStateEntropy
|
|
****************************************************************** */
|
|
#ifndef HUFF0_H
|
|
#define HUFF0_H
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
/* ****************************************
|
|
* Dependency
|
|
******************************************/
|
|
#include <stddef.h> /* size_t */
|
|
|
|
|
|
/* ****************************************
|
|
* Huff0 simple functions
|
|
******************************************/
|
|
size_t HUF_compress(void* dst, size_t maxDstSize,
|
|
const void* src, size_t srcSize);
|
|
size_t HUF_decompress(void* dst, size_t dstSize,
|
|
const void* cSrc, size_t cSrcSize);
|
|
/*!
|
|
HUF_compress():
|
|
Compress content of buffer 'src', of size 'srcSize', into destination buffer 'dst'.
|
|
'dst' buffer must be already allocated. Compression runs faster if maxDstSize >= HUF_compressBound(srcSize).
|
|
Note : srcSize must be <= 128 KB
|
|
@return : size of compressed data (<= maxDstSize)
|
|
Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!!
|
|
if return == 1, srcData is a single repeated byte symbol (RLE compression)
|
|
if HUF_isError(return), compression failed (more details using HUF_getErrorName())
|
|
|
|
HUF_decompress():
|
|
Decompress Huff0 data from buffer 'cSrc', of size 'cSrcSize',
|
|
into already allocated destination buffer 'dst', of size 'dstSize'.
|
|
@dstSize : must be the **exact** size of original (uncompressed) data.
|
|
Note : in contrast with FSE, HUF_decompress can regenerate
|
|
RLE (cSrcSize==1) and uncompressed (cSrcSize==dstSize) data,
|
|
because it knows size to regenerate.
|
|
@return : size of regenerated data (== dstSize)
|
|
or an error code, which can be tested using HUF_isError()
|
|
*/
|
|
|
|
|
|
/* ****************************************
|
|
* Tool functions
|
|
******************************************/
|
|
size_t HUF_compressBound(size_t size); /* maximum compressed size */
|
|
|
|
/* Error Management */
|
|
unsigned HUF_isError(size_t code); /* tells if a return value is an error code */
|
|
const char* HUF_getErrorName(size_t code); /* provides error code string (useful for debugging) */
|
|
|
|
|
|
/* ****************************************
|
|
* Advanced functions
|
|
******************************************/
|
|
size_t HUF_compress2 (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog);
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* HUFF0_H */
|