mirror of
https://github.com/MacPaw/XADMaster.git
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112 lines
2.9 KiB
Objective-C
112 lines
2.9 KiB
Objective-C
/*
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* XADLZSSHandle.m
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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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#import "XADLZSSHandle.h"
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@implementation XADLZSSHandle
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/*-(id)initWithName:(NSString *)descname windowSize:(int)windowsize
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{
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return [self initWithName:descname length:CSHandleMaxLength windowSize:windowsize];
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}
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-(id)initWithName:(NSString *)descname length:(off_t)length windowSize:(int)windowsize
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{
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if((self=[super initWithName:descname length:length]))
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{
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nextliteral_ptr=(int (*)(id,SEL,int *,int *,off_t))
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[self methodForSelector:@selector(nextLiteralOrOffset:andLength:atPosition:)];
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windowbuffer=malloc(windowsize);
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windowmask=windowsize-1; // Assumes windows are always power-of-two sized!
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}
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return self;
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}*/
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-(id)initWithInputBufferForHandle:(CSHandle *)handle windowSize:(int)windowsize
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{
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return [self initWithInputBufferForHandle:handle length:CSHandleMaxLength windowSize:windowsize];
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}
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-(id)initWithInputBufferForHandle:(CSHandle *)handle length:(off_t)length windowSize:(int)windowsize
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{
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if((self=[super initWithInputBufferForHandle:handle length:length]))
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{
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nextliteral_ptr=(int (*)(id,SEL,int *,int *,off_t))
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[self methodForSelector:@selector(nextLiteralOrOffset:andLength:atPosition:)];
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windowbuffer=malloc(windowsize);
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windowmask=windowsize-1; // Assumes windows are always power-of-two sized!
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}
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return self;
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}
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-(void)dealloc
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{
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free(windowbuffer);
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[super dealloc];
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}
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-(void)resetByteStream
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{
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matchlength=0;
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matchoffset=0;
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memset(windowbuffer,0,windowmask+1);
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[self resetLZSSHandle];
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}
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-(uint8_t)produceByteAtOffset:(off_t)pos
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{
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if(!matchlength)
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{
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int offset,length;
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int val=nextliteral_ptr(self,@selector(nextLiteralOrOffset:andLength:atPosition:),&offset,&length,pos);
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if(val>=0)
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{
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windowbuffer[pos&windowmask]=val;
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return val;
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}
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else if(val==XADLZSSEnd)
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{
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CSByteStreamEOF(self);
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}
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else
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{
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matchlength=length;
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matchoffset=(int)(pos-offset);
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}
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}
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matchlength--;
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uint8_t byte=windowbuffer[matchoffset++&windowmask];
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windowbuffer[pos&windowmask]=byte;
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return byte;
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}
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-(void)resetLZSSHandle {}
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-(int)nextLiteralOrOffset:(int *)offset andLength:(int *)length atPosition:(off_t)pos { return XADLZSSEnd; }
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@end
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