80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
/*
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* This file is a part of Pcompress, a chunked parallel multi-
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* algorithm lossless compression and decompression program.
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*
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* Copyright (C) 2012-2013 Moinak Ghosh. All rights reserved.
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* Use is subject to license terms.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program.
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* If not, see <http://www.gnu.org/licenses/>.
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*
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* moinakg@gmail.com, http://moinakg.wordpress.com/
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*/
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/*
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* Dict filter for text files. Adapted from Public Domain sources
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* of Fu Siyuan's CSC 3.2 archiver.
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*/
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#ifndef _FILTERS_H
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#define _FILTERS_H
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#include <utils.h>
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#include "Common.h"
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#define MAX_WORDTREE_NODE_NUM 300 //Enough now!
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class DictFilter
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{
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public:
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~DictFilter();
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DictFilter();
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u32 Forward_Dict(u8 *src, u32 size, u8 *dst, u32 *dstsize);
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void Inverse_Dict(u8 *src, u32 size, u8 *dst, u32 *dstsize);
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private:
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typedef struct
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{
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u32 next[26];
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u8 symbol;
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} CTreeNode;
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CTreeNode wordTree[MAX_WORDTREE_NODE_NUM];
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u32 nodeMum;
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u8 maxSymbol;
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//Used for DICT transformer. Words are stored in trees.
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u32 wordIndex[256];
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//Used for DICT untransformer.choose words by symbols.
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void MakeWordTree(); //Init the DICT transformer
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u32 x0,x1;
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u32 i,k;
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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void *new_dict_context();
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void delete_dict_context(void *dict_ctx);
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int dict_encode(void *dict_ctx, uchar_t *from, uint64_t fromlen, uchar_t *to, uint64_t *dstlen);
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int dict_decode(void *dict_ctx, uchar_t *from, uint64_t fromlen, uchar_t *to, uint64_t *dstlen);
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#ifdef __cplusplus
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}
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#endif
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#endif
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