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// InBuffer.h
#ifndef __INBUFFER_H
#define __INBUFFER_H
#include "../IStream.h"
#include "../../Common/MyCom.h"
#include "../../Common/MyException.h"
#ifndef _NO_EXCEPTIONS
struct CInBufferException: public CSystemException
{
CInBufferException(HRESULT errorCode): CSystemException(errorCode) {}
};
#endif
class CInBuffer
{
Byte *_buffer;
Byte *_bufferLimit;
Byte *_bufferBase;
CMyComPtr<ISequentialInStream> _stream;
UInt64 _processedSize;
UInt32 _bufferSize;
bool _wasFinished;
bool ReadBlock();
Byte ReadBlock2();
public:
#ifdef _NO_EXCEPTIONS
HRESULT ErrorCode;
#endif
CInBuffer();
~CInBuffer() { Free(); }
bool Create(UInt32 bufferSize);
void Free();
void SetStream(ISequentialInStream *stream);
void Init();
void ReleaseStream() { _stream.Release(); }
bool ReadByte(Byte &b)
{
if (_buffer >= _bufferLimit)
if (!ReadBlock())
return false;
b = *_buffer++;
return true;
}
Byte ReadByte()
{
if (_buffer >= _bufferLimit)
return ReadBlock2();
return *_buffer++;
}
UInt32 ReadBytes(Byte *buf, UInt32 size)
{
if ((UInt32)(_bufferLimit - _buffer) >= size)
{
for (UInt32 i = 0; i < size; i++)
buf[i] = _buffer[i];
_buffer += size;
return size;
}
for (UInt32 i = 0; i < size; i++)
{
if (_buffer >= _bufferLimit)
if (!ReadBlock())
return i;
buf[i] = *_buffer++;
}
return size;
}
UInt64 GetProcessedSize() const { return _processedSize + (_buffer - _bufferBase); }
bool WasFinished() const { return _wasFinished; }
};
#endif
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