mirror of
https://github.com/MacPaw/XADMaster.git
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111 lines
2.8 KiB
Objective-C
111 lines
2.8 KiB
Objective-C
/*
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* XADFastLZSSHandle.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 "XADFastLZSSHandle.h"
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// TODO: Seeking
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@implementation XADFastLZSSHandle
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-(id)initWithParentHandle:(CSHandle *)handle windowSize:(int)windowsize
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{
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return [self initWithParentHandle:handle length:CSHandleMaxLength windowSize:windowsize];
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}
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-(id)initWithParentHandle:(CSHandle *)handle length:(off_t)length windowSize:(int)windowsize
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{
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if((self=[super initWithParentHandle:handle length:length]))
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{
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InitializeLZSS(&lzss,windowsize);
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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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InitializeLZSS(&lzss,windowsize);
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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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CleanupLZSS(&lzss);
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[super dealloc];
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}
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-(void)resetStream
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{
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RestartLZSS(&lzss);
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[self resetLZSSHandle];
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}
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-(int)streamAtMost:(int)num toBuffer:(void *)buffer
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{
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bufferpointer=buffer;
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bufferpos=streampos;
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bufferend=streampos+num;
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XADLZSSFlushToBuffer(self);
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if(bufferpos!=bufferend)
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{
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flushbarrier=LZSSPosition(&lzss)+LZSSWindowSize(&lzss);
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[self expandFromPosition:LZSSPosition(&lzss)];
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XADLZSSFlushToBuffer(self);
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}
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return (int)(bufferpos-streampos);
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}
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-(void)resetLZSSHandle {}
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-(void)expandFromPosition:(off_t)pos {}
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-(void)endLZSSHandle { [self endStream]; }
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// TODO: remove usage of bufferpos entirely, it's somewhat redundant.
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void XADLZSSFlushToBuffer(XADFastLZSSHandle *self)
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{
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off_t end=LZSSPosition(&self->lzss);
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if(end>self->bufferend) end=self->bufferend;
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int available=(int)(end-self->bufferpos);
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if(available==0) return;
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//if(available<0) [XADException raiseUnknownException]; // TODO: better error
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CopyBytesFromLZSSWindow(&self->lzss,self->bufferpointer,self->bufferpos,available);
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self->bufferpos+=available;
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self->bufferpointer+=available;
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self->flushbarrier+=available;
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}
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@end
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