/*
* Copyright (c) 2009 Julien Ponge. All rights reserved.
*
* <julien.ponge@gmail.com>
* http://julien.ponge.info/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This work is based on the LZMA SDK by Igor Pavlov.
* The LZMA SDK is placed under the public domain, and can be obtained from
*
* http://www.7-zip.org/sdk.html
*
* The LzmaInputStream and LzmaOutputStream classes were inspired by the
* work of Christopher League, although they are not derivative works.
*
* http://contrapunctus.net/league/haques/lzmajio/
*/
package lzma.sdk.lz;
import java.io.IOException;
public class OutWindow
{
private byte[] _buffer;
private int _pos;
private int _windowSize = 0;
private int _streamPos;
private 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];
}
}