LZOutWindow.h
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// LZOutWindow.h
#ifndef __LZ_OUT_WINDOW_H
#define __LZ_OUT_WINDOW_H
#include "../../IStream.h"
#include "../../Common/OutBuffer.h"
#ifndef _NO_EXCEPTIONS
typedef COutBufferException CLZOutWindowException;
#endif
class CLZOutWindow: public COutBuffer
{
public:
void Init(bool solid = false);
// distance >= 0, len > 0,
bool CopyBlock(UInt32 distance, UInt32 len)
{
UInt32 pos = _pos - distance - 1;
if (distance >= _pos)
{
if (!_overDict || distance >= _bufferSize)
return false;
pos += _bufferSize;
}
if (_limitPos - _pos > len && _bufferSize - pos > len)
{
const Byte *src = _buffer + pos;
Byte *dest = _buffer + _pos;
_pos += len;
do
*dest++ = *src++;
while(--len != 0);
}
else do
{
if (pos == _bufferSize)
pos = 0;
_buffer[_pos++] = _buffer[pos++];
if (_pos == _limitPos)
FlushWithCheck();
}
while(--len != 0);
return true;
}
void PutByte(Byte b)
{
_buffer[_pos++] = b;
if (_pos == _limitPos)
FlushWithCheck();
}
Byte GetByte(UInt32 distance) const
{
UInt32 pos = _pos - distance - 1;
if (pos >= _bufferSize)
pos += _bufferSize;
return _buffer[pos];
}
};
#endif