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#ifndef __STREAM_WINDOWOUT_H
#define __STREAM_WINDOWOUT_H
#include "IInOutStreams.h"
namespace NStream {
namespace NWindow {
// m_KeepSizeBefore: how mach BYTEs must be in buffer before m_Pos;
// m_KeepSizeAfter: how mach BYTEs must be in buffer after m_Pos;
// m_KeepSizeReserv: how mach BYTEs must be in buffer for Moving Reserv;
// must be >= aKeepSizeAfter; // test it
class COut
{
BYTE *m_Buffer;
INT m_Pos;
INT m_PosLimit;
INT m_KeepSizeBefore;
INT m_KeepSizeAfter;
INT m_KeepSizeReserv;
INT m_StreamPos;
INT m_WindowSize;
INT m_MoveFrom;
ISequentialOutStream *m_Stream;
virtual void MoveBlockBackward();
public:
COut(): m_Buffer(0), m_Stream(0) {}
virtual ~COut();
void Create(INT aKeepSizeBefore,
INT aKeepSizeAfter, INT aKeepSizeReserv = (1<<17));
void SetWindowSize(INT aWindowSize);
void Init(ISequentialOutStream *aStream, bool aSolid = false);
HRESULT Flush();
INT GetCurPos() const { return m_Pos; }
const BYTE *GetPointerToCurrentPos() const { return m_Buffer + m_Pos;};
void CopyBackBlock(INT aDistance, INT aLen)
{
if (m_Pos >= m_PosLimit)
MoveBlockBackward();
BYTE *p = m_Buffer + m_Pos;
aDistance++;
for(INT i = 0; i < aLen; i++)
p[i] = p[i - aDistance];
m_Pos += aLen;
}
void PutOneByte(BYTE aByte)
{
if (m_Pos >= m_PosLimit)
MoveBlockBackward();
m_Buffer[m_Pos++] = aByte;
}
BYTE GetOneByte(INT anIndex) const
{
return m_Buffer[m_Pos + anIndex];
}
BYTE *GetBuffer() const { return m_Buffer; }
};
}}
#endif
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