/usr/include/shogun/lib/Compressor.h is in libshogun-dev 3.2.0-7.5.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | /*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Written (W) 2009 Soeren Sonnenburg
* Copyright (C) 2009 Berlin Institute of Technology
*/
#ifndef __COMPRESSOR_H__
#define __COMPRESSOR_H__
#include <shogun/lib/config.h>
#include <shogun/lib/common.h>
#include <shogun/base/SGObject.h>
#include <shogun/io/SGIO.h>
namespace shogun
{
/** compression type */
enum E_COMPRESSION_TYPE
{
UNCOMPRESSED,
LZO,
GZIP,
BZIP2,
LZMA,
SNAPPY
};
/** @brief Compression library for compressing and decompressing buffers using
* one of the standard compression algorithms:
*
* LZO, GZIP, BZIP2 or LZMA, SNAPPY.
*
* The general recommendation is to use SNAPPY or LZO whenever lightweight compression
* is sufficient but high i/o throughputs are needed (at 1/2 the speed of memcpy).
*
* If size is all that matters use LZMA (which especially when compressing
* can be very slow though).
*
* Note that besides lzo compression, this library is thread safe.
*
*/
class CCompressor : public CSGObject
{
public:
/** default constructor */
CCompressor();
/** default constructor
*
* @param ct compression to use: one of UNCOMPRESSED, LZO, GZIP, BZIP2 or LZMA
*/
CCompressor(E_COMPRESSION_TYPE ct) : CSGObject(), compression_type(ct)
{
}
/** default destructor */
virtual ~CCompressor()
{
}
/** compress data
*
* compresses the buffer uncompressed using the selected compression
* algorithm and returns compressed data and its size
*
* @param uncompressed - uncompressed data to be compressed
* @param uncompressed_size - size of the uncompressed data
* @param compressed - pointer to hold compressed data (returned)
* @param compressed_size - size of compressed data (returned)
* @param level - compression level between 1 and 9
*/
void compress(uint8_t* uncompressed, uint64_t uncompressed_size,
uint8_t* &compressed, uint64_t &compressed_size, int32_t level=1);
/** decompress data
*
* Decompresses the buffer using the selected compression
* algorithm to the memory block specified in uncompressed.
* Note: Compressed and uncompressed size must be known prior to
* calling this function.
*
* @param compressed - pointer to compressed data
* @param compressed_size - size of compressed data
* @param uncompressed - pointer to buffer to hold uncompressed data
* @param uncompressed_size - size of the uncompressed data
*/
void decompress(uint8_t* compressed, uint64_t compressed_size,
uint8_t* uncompressed, uint64_t& uncompressed_size);
/** @return object name */
virtual const char* get_name() const { return "Compressor"; }
protected:
/** compressor type */
E_COMPRESSION_TYPE compression_type;
};
}
#endif //__COMPRESSOR_H__
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