/usr/include/claw/lzw_decoder.hpp is in libclaw-dev 1.7.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /*
CLAW - a C++ Library Absolutely Wonderful
CLAW is a free library without any particular aim but being useful to
anyone.
Copyright (C) 2005-2011 Julien Jorge
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
contact: julien.jorge@gamned.org
*/
/**
* \file lzw_decoder.hpp
* \brief A class to help decoding a stream encoded with Lempel-Ziv-Welch (LZW)
* compression algorithm.
* \author Julien Jorge
*/
#ifndef __CLAW_LZW_DECODER_HPP__
#define __CLAW_LZW_DECODER_HPP__
#include <vector>
#include <utility>
namespace claw
{
/**
* \brief A class to help decoding a stream encoded with Lempel-Ziv-Welch
* (LZW) compression algorithm.
*
*\b Template \b parameters:
* - \a InputBuffer The type of the buffer where we read the compressed datas,
* - \a OutputBuffer The type of the buffer where we write the uncompressed
* datas.
*
* The \a InputBuffer type must have the following methods:
* - bool end_of_data(), tell if the input buffer is empty,
* - unsigned int symbols_count(), get the number of different symbols in the
* uncompressed data,
* - unsigned int get_next(), returns the next code and moves to the next
* symbol.
*
* The \a OutputBuffer type must have the following methods:
* - write( unsigned int ), write a symbol in the output.
*
* \author Julien Jorge
*/
template<typename InputBuffer, typename OutputBuffer>
class lzw_decoder
{
public:
/** \brief The type of the input buffer. */
typedef InputBuffer input_buffer_type;
/** \brief The type of the output buffer. */
typedef OutputBuffer output_buffer_type;
private:
typedef std::pair<unsigned int, unsigned int> word_type;
typedef std::vector<word_type> table_type;
public:
void decode( input_buffer_type& input, output_buffer_type& output );
private:
unsigned int get_first_symbol
( const table_type& table, const unsigned int code,
const unsigned int symbols_count ) const;
void decompose
( const table_type& table, unsigned int code,
const unsigned int symbols_count, output_buffer_type& output ) const;
}; // class lzw_decoder
} // namespace claw
#include <claw/impl/lzw_decoder.tpp>
#endif // __CLAW_LZW_DECODER_HPP__
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