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63 lines
1.7 KiB
C
63 lines
1.7 KiB
C
/*
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* LZSS.c
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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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#include "LZSS.h"
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#include <stdlib.h>
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#include <string.h>
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bool InitializeLZSS(LZSS *self,size_t windowsize)
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{
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self->window=malloc(windowsize);
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if(!self->window) return false;
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self->mask=windowsize-1; // Assume windows are power-of-two sized!
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RestartLZSS(self);
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return true;
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}
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void CleanupLZSS(LZSS *self)
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{
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free(self->window);
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}
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void RestartLZSS(LZSS *self)
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{
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memset(self->window,0,LZSSWindowSize(self));
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self->position=0;
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}
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void CopyBytesFromLZSSWindow(LZSS *self,uint8_t *buffer,int64_t startpos,int length)
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{
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size_t windowoffs=LZSSWindowOffsetForPosition(self,startpos);
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if(windowoffs+length<=LZSSWindowSize(self)) // Request fits inside window
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{
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memcpy(buffer,&self->window[windowoffs],length);
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}
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else // Request wraps around window
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{
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size_t firstpart=LZSSWindowSize(self)-windowoffs;
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memcpy(&buffer[0],&self->window[windowoffs],firstpart);
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memcpy(&buffer[firstpart],&self->window[0],length-firstpart);
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}
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}
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