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// InBuffer.h
#ifndef __IN_BUFFER_H
#define __IN_BUFFER_H
#include "../../Common/MyException.h"
#include "../IStream.h"
#ifndef _NO_EXCEPTIONS
struct CInBufferException: public CSystemException
{
CInBufferException(HRESULT errorCode): CSystemException(errorCode) {}
};
#endif
class CInBufferBase
{
protected:
Byte *_buf;
Byte *_bufLim;
Byte *_bufBase;
ISequentialInStream *_stream;
UInt64 _processedSize;
size_t _bufSize; // actually it's number of Bytes for next read. The buf can be larger
// only up to 32-bits values now are supported!
bool _wasFinished;
bool ReadBlock();
bool ReadByte_FromNewBlock(Byte &b);
Byte ReadByte_FromNewBlock();
public:
#ifdef _NO_EXCEPTIONS
HRESULT ErrorCode;
#endif
UInt32 NumExtraBytes;
CInBufferBase() throw();
UInt64 GetStreamSize() const { return _processedSize + (_buf - _bufBase); }
UInt64 GetProcessedSize() const { return _processedSize + NumExtraBytes + (_buf - _bufBase); }
bool WasFinished() const { return _wasFinished; }
void SetStream(ISequentialInStream *stream) { _stream = stream; }
void SetBuf(Byte *buf, size_t bufSize, size_t end, size_t pos)
{
_bufBase = buf;
_bufSize = bufSize;
_processedSize = 0;
_buf = buf + pos;
_bufLim = buf + end;
_wasFinished = false;
#ifdef _NO_EXCEPTIONS
ErrorCode = S_OK;
#endif
NumExtraBytes = 0;
}
void Init() throw();
bool ReadByte(Byte &b)
{
if (_buf >= _bufLim)
return ReadByte_FromNewBlock(b);
b = *_buf++;
return true;
}
Byte ReadByte()
{
if (_buf >= _bufLim)
return ReadByte_FromNewBlock();
return *_buf++;
}
size_t ReadBytes(Byte *buf, size_t size);
size_t Skip(size_t size);
};
class CInBuffer: public CInBufferBase
{
public:
~CInBuffer() { Free(); }
bool Create(size_t bufSize) throw(); // only up to 32-bits values now are supported!
void Free() throw();
};
#endif
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