OutWindow.java
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// LZ.OutWindow
package SevenZip.Compression.LZ;
import java.io.IOException;
public class OutWindow
{
byte[] _buffer;
int _pos;
int _windowSize = 0;
int _streamPos;
java.io.OutputStream _stream;
public void Create(int windowSize)
{
if (_buffer == null || _windowSize != windowSize)
_buffer = new byte[windowSize];
_windowSize = windowSize;
_pos = 0;
_streamPos = 0;
}
public void SetStream(java.io.OutputStream stream) throws IOException
{
ReleaseStream();
_stream = stream;
}
public void ReleaseStream() throws IOException
{
Flush();
_stream = null;
}
public void Init(boolean solid)
{
if (!solid)
{
_streamPos = 0;
_pos = 0;
}
}
public void Flush() throws IOException
{
int size = _pos - _streamPos;
if (size == 0)
return;
_stream.write(_buffer, _streamPos, size);
if (_pos >= _windowSize)
_pos = 0;
_streamPos = _pos;
}
public void CopyBlock(int distance, int len) throws IOException
{
int pos = _pos - distance - 1;
if (pos < 0)
pos += _windowSize;
for (; len != 0; len--)
{
if (pos >= _windowSize)
pos = 0;
_buffer[_pos++] = _buffer[pos++];
if (_pos >= _windowSize)
Flush();
}
}
public void PutByte(byte b) throws IOException
{
_buffer[_pos++] = b;
if (_pos >= _windowSize)
Flush();
}
public byte GetByte(int distance)
{
int pos = _pos - distance - 1;
if (pos < 0)
pos += _windowSize;
return _buffer[pos];
}
}