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