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