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86 lines
2 KiB
C
86 lines
2 KiB
C
/*
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* LZW.h
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*
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* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
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*
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* This library 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 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef __LZW_H__
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#define __LZW_H__
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#include <stdint.h>
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#include <stdbool.h>
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#define LZWNoError 0
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#define LZWInvalidCodeError 1
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#define LZWTooManyCodesError 2
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typedef struct LZWTreeNode
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{
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uint8_t chr;
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int parent;
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} LZWTreeNode;
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typedef struct LZW
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{
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int numsymbols,maxsymbols,reservedsymbols;
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int prevsymbol;
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int symbolsize;
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uint8_t *buffer;
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int buffersize;
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LZWTreeNode nodes[0];
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} LZW;
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LZW *AllocLZW(int maxsymbols,int reservedsymbols);
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void FreeLZW(LZW *self);
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void ClearLZWTable(LZW *self);
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int NextLZWSymbol(LZW *self,int symbol);
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int ReplaceLZWSymbol(LZW *self,int oldsymbol,int symbol);
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int LZWOutputLength(LZW *self);
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int LZWOutputToBuffer(LZW *self,uint8_t *buffer);
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int LZWReverseOutputToBuffer(LZW *self,uint8_t *buffer);
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int LZWOutputToInternalBuffer(LZW *self);
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static inline int LZWSuggestedSymbolSize(LZW *self)
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{
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return self->symbolsize;
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}
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static inline uint8_t *LZWInternalBuffer(LZW *self)
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{
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return self->buffer;
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}
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static inline int LZWSymbolCount(LZW *self)
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{
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return self->numsymbols;
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}
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static inline bool LZWSymbolListFull(LZW *self)
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{
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return self->numsymbols==self->maxsymbols;
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}
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static inline LZWTreeNode *LZWSymbols(LZW *self)
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{
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return self->nodes;
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}
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#endif
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