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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;
UINT32 m_Pos;
UINT32 m_PosLimit;
UINT32 m_KeepSizeBefore;
UINT32 m_KeepSizeAfter;
UINT32 m_KeepSizeReserv;
UINT32 m_StreamPos;
UINT32 m_WindowSize;
UINT32 m_MoveFrom;
ISequentialOutStream *m_Stream;
virtual void MoveBlockBackward();
public:
COut(): m_Buffer(0), m_Stream(0) {}
virtual ~COut();
void Create(UINT32 aKeepSizeBefore,
UINT32 aKeepSizeAfter, UINT32 aKeepSizeReserv = (1<<17));
void SetWindowSize(UINT32 aWindowSize);
void Init(ISequentialOutStream *aStream, bool aSolid = false);
HRESULT Flush();
UINT32 GetCurPos() const { return m_Pos; }
const BYTE *GetPointerToCurrentPos() const { return m_Buffer + m_Pos;};
void CopyBackBlock(UINT32 aDistance, UINT32 aLen)
{
if (m_Pos >= m_PosLimit)
MoveBlockBackward();
BYTE *p = m_Buffer + m_Pos;
aDistance++;
for(UINT32 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(UINT32 anIndex) const
{
return m_Buffer[m_Pos + anIndex];
}
BYTE *GetBuffer() const { return m_Buffer; }
};
}}
#endif
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