71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/*
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* Basic implementation of LZ78 compression algorithm
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*
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* Copyright (C) 2010 evilaliv3 <giovanni.pellerano@evilaliv3.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __LZ78_H
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#define __LZ78_H
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#include "bitio.h"
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/* Modes of compression */
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#define LZ78_MODE_COMPRESS 0
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#define LZ78_MODE_DECOMPRESS 1
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/* List of lz78-level return codes */
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#define LZ78_SUCCESS 0
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#define LZ78_ERROR_DICTIONARY 1
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#define LZ78_ERROR_READ 2
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#define LZ78_ERROR_WRITE 3
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#define LZ78_ERROR_EAGAIN 4
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#define LZ78_ERROR_COMPRESS 5
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#define LZ78_ERROR_DECOMPRESS 6
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#define LZ78_ERROR_INITIALIZATION 7
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#define LZ78_ERROR_MODE 8
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/* Size of the dictionary */
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#define DICT_SIZE_MIN 260
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#define DICT_SIZE_DEFAULT 4096
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#define DICT_SIZE_MAX 1048576
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/* Opaque type representing the compression instance */
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typedef struct __lz78_instance lz78_instance;
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/* Allocate and return an instance of lz78 compressor
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cmode: specify compress/decompress mode
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dsize: specify the size of the dictionary (byte)
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*/
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lz78_instance* lz78_new(uint8_t cmode, uint32_t dsize);
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/* Compress the input stream by sending the result to the output stream
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arg: current instance of compressor obtained by invoking lz78_init()
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Return: one of defined lz78-level return codes
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*/
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uint8_t lz78_compress(lz78_instance* lz78, int fd_in, int fd_out);
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/* Decompress the input stream by sending the result to the output stream
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arg: current instance of compressor obtained by invoking lz78_init()
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Return: one of defined lz78-level return codes
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*/
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uint8_t lz78_decompress(lz78_instance* lz78, int fd_in, int fd_out);
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/* Deallocate current instance */
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void lz78_destroy(lz78_instance* lz78);
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#endif /* __LZ78_H */
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