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84 lines
2.7 KiB
Objective-C
84 lines
2.7 KiB
Objective-C
/*
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* XADFastLZSSHandle.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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#import "CSStreamHandle.h"
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#import "LZSS.h"
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#import "XADException.h"
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@interface XADFastLZSSHandle:CSStreamHandle
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{
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@public
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LZSS lzss;
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off_t flushbarrier;
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off_t bufferpos,bufferend;
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uint8_t *bufferpointer;
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}
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-(id)initWithParentHandle:(CSHandle *)handle windowSize:(int)windowsize;
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-(id)initWithParentHandle:(CSHandle *)handle length:(off_t)length windowSize:(int)windowsize;
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-(id)initWithInputBufferForHandle:(CSHandle *)handle windowSize:(int)windowsize;
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-(id)initWithInputBufferForHandle:(CSHandle *)handle length:(off_t)length windowSize:(int)windowsize;
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-(void)dealloc;
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-(void)resetStream;
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-(int)streamAtMost:(int)num toBuffer:(void *)buffer;
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-(void)resetLZSSHandle;
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-(void)expandFromPosition:(off_t)pos;
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-(void)endLZSSHandle;
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@end
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void XADLZSSFlushToBuffer(XADFastLZSSHandle *self);
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static inline BOOL XADLZSSShouldKeepExpanding(XADFastLZSSHandle *self)
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{
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return LZSSPosition(&self->lzss)<self->bufferend;
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}
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static inline void XADEmitLZSSLiteral(XADFastLZSSHandle *self,uint8_t byte,off_t *pos)
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{
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if(LZSSPosition(&self->lzss)==self->flushbarrier) XADLZSSFlushToBuffer(self);
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EmitLZSSLiteral(&self->lzss,byte);
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if(pos) *pos=LZSSPosition(&self->lzss);
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}
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static inline void XADEmitLZSSMatch(XADFastLZSSHandle *self,int offset,int length,off_t *pos)
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{
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// You can not emit more than the window size, or data would get lost. If you need to do this,
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// you need to divide the match into smaller parts so you can call ShouldKeepExpanding in between and
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// exit if needed. See XADStacLZSHandle for an example.
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if(length>LZSSWindowSize(&self->lzss)) [XADException raiseDecrunchException];
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if(LZSSPosition(&self->lzss)+length>self->flushbarrier) XADLZSSFlushToBuffer(self);
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EmitLZSSMatch(&self->lzss,offset,length);
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if(pos) *pos=LZSSPosition(&self->lzss);
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}
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/*static inline uint8_t XADLZSSByteFromWindow2(XADFastLZSSHandle *self,off_t absolutepos)
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{
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return self->windowbuffer[absolutepos&self->windowmask];
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}*/
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