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#import <Foundation/Foundation.h>
#import "CSHandle.h"
typedef struct CSInputBuffer
{
CSHandle *parent;
off_t startoffs;
BOOL eof;
uint8_t *buffer;
unsigned int bufsize,bufbytes,currbyte;
uint32_t bits;
unsigned int numbits;
} CSInputBuffer;
// Allocation and management
CSInputBuffer *CSInputBufferAlloc(CSHandle *parent,int size);
CSInputBuffer *CSInputBufferAllocWithBuffer(const uint8_t *buffer,int length,off_t startoffs);
CSInputBuffer *CSInputBufferAllocEmpty();
void CSInputBufferFree(CSInputBuffer *self);
void CSInputSetMemoryBuffer(CSInputBuffer *self,uint8_t *buffer,int length,off_t startoffs);
static inline CSHandle *CSInputHandle(CSInputBuffer *self)
{
return self->parent;
}
// Buffer and file positioning
void CSInputRestart(CSInputBuffer *self);
void CSInputFlush(CSInputBuffer *self);
void CSInputSynchronizeFileOffset(CSInputBuffer *self);
void CSInputSeekToFileOffset(CSInputBuffer *self,off_t offset);
void CSInputSeekToBufferOffset(CSInputBuffer *self,off_t offset);
void CSInputSetStartOffset(CSInputBuffer *self,off_t offset);
off_t CSInputBufferOffset(CSInputBuffer *self);
off_t CSInputFileOffset(CSInputBuffer *self);
off_t CSInputBufferBitOffset(CSInputBuffer *self);
void _CSInputFillBuffer(CSInputBuffer *self);
// Byte reading
#define CSInputBufferLookAhead 4
static inline void _CSInputBufferRaiseEOF(CSInputBuffer *self)
{
[self->parent _raiseEOF];
}
static inline int _CSInputBytesLeftInBuffer(CSInputBuffer *self)
{
return self->bufbytes-self->currbyte;
}
static inline void _CSInputCheckAndFillBuffer(CSInputBuffer *self)
{
if(!self->eof&&_CSInputBytesLeftInBuffer(self)<=CSInputBufferLookAhead) _CSInputFillBuffer(self);
}
static inline void CSInputSkipBytes(CSInputBuffer *self,int num)
{
self->currbyte+=num;
}
static inline int _CSInputPeekByteWithoutEOF(CSInputBuffer *self,int offs)
{
return self->buffer[self->currbyte+offs];
}
static inline int CSInputPeekByte(CSInputBuffer *self,int offs)
{
_CSInputCheckAndFillBuffer(self);
if(offs>=_CSInputBytesLeftInBuffer(self)) _CSInputBufferRaiseEOF(self);
return _CSInputPeekByteWithoutEOF(self,offs);
}
static inline int CSInputNextByte(CSInputBuffer *self)
{
int byte=CSInputPeekByte(self,0);
CSInputSkipBytes(self,1);
return byte;
}
static inline BOOL CSInputAtEOF(CSInputBuffer *self)
{
_CSInputCheckAndFillBuffer(self);
return _CSInputBytesLeftInBuffer(self)<=0;
}
// Bitstream reading
void _CSInputFillBits(CSInputBuffer *self);
void _CSInputFillBitsLE(CSInputBuffer *self);
unsigned int CSInputNextBit(CSInputBuffer *self);
unsigned int CSInputNextBitLE(CSInputBuffer *self);
unsigned int CSInputNextBitString(CSInputBuffer *self,int numbits);
unsigned int CSInputNextBitStringLE(CSInputBuffer *self,int numbits);
unsigned int CSInputNextLongBitString(CSInputBuffer *self,int numbits);
unsigned int CSInputNextLongBitStringLE(CSInputBuffer *self,int numbits);
void CSInputSkipBits(CSInputBuffer *self,int numbits);
void CSInputSkipBitsLE(CSInputBuffer *self,int numbits);
BOOL CSInputOnByteBoundary(CSInputBuffer *self);
void CSInputSkipToByteBoundary(CSInputBuffer *self);
void CSInputSkipTo16BitBoundary(CSInputBuffer *self);
static inline unsigned int CSInputBitsLeftInBuffer(CSInputBuffer *self)
{
_CSInputCheckAndFillBuffer(self);
return _CSInputBytesLeftInBuffer(self)*8+(self->numbits&7);
}
static inline void _CSInputCheckAndFillBits(CSInputBuffer *self,int numbits)
{
if(numbits>self->numbits) _CSInputFillBits(self);
}
static inline void _CSInputCheckAndFillBitsLE(CSInputBuffer *self,int numbits)
{
if(numbits>self->numbits) _CSInputFillBitsLE(self);
}
static inline unsigned int CSInputPeekBitString(CSInputBuffer *self,int numbits)
{
if(numbits==0) return 0;
_CSInputCheckAndFillBits(self,numbits);
return self->bits>>(32-numbits);
}
static inline unsigned int CSInputPeekBitStringLE(CSInputBuffer *self,int numbits)
{
if(numbits==0) return 0;
_CSInputCheckAndFillBitsLE(self,numbits);
return self->bits&((1<<numbits)-1);
}
static inline void CSInputSkipPeekedBits(CSInputBuffer *self,int numbits)
{
int numbytes=(numbits-(self->numbits&7)+7)>>3;
CSInputSkipBytes(self,numbytes);
if(_CSInputBytesLeftInBuffer(self)<0) _CSInputBufferRaiseEOF(self);
self->bits<<=numbits;
self->numbits-=numbits;
}
static inline void CSInputSkipPeekedBitsLE(CSInputBuffer *self,int numbits)
{
int numbytes=(numbits-(self->numbits&7)+7)>>3;
CSInputSkipBytes(self,numbytes);
if(_CSInputBytesLeftInBuffer(self)<0) _CSInputBufferRaiseEOF(self);
self->bits>>=numbits;
self->numbits-=numbits;
}
// Multibyte reading
#define CSInputNextValueImpl(type,name,conv) \
static inline type name(CSInputBuffer *self) \
{ \
_CSInputCheckAndFillBuffer(self); \
type val=conv(self->buffer+self->currbyte); \
CSInputSkipBytes(self,sizeof(type)); \
return val; \
}
CSInputNextValueImpl(int16_t,CSInputNextInt16LE,CSInt16LE)
CSInputNextValueImpl(int32_t,CSInputNextInt32LE,CSInt32LE)
CSInputNextValueImpl(uint16_t,CSInputNextUInt16LE,CSUInt16LE)
CSInputNextValueImpl(uint32_t,CSInputNextUInt32LE,CSUInt32LE)
CSInputNextValueImpl(int16_t,CSInputNextInt16BE,CSInt16BE)
CSInputNextValueImpl(int32_t,CSInputNextInt32BE,CSInt32BE)
CSInputNextValueImpl(uint16_t,CSInputNextUInt16BE,CSUInt16BE)
CSInputNextValueImpl(uint32_t,CSInputNextUInt32BE,CSUInt32BE)
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