1// LZ.OutWindow
2
3package SevenZip.Compression.LZ;
4
5import java.io.IOException;
6
7public class OutWindow
8{
9	byte[] _buffer;
10	int _pos;
11	int _windowSize = 0;
12	int _streamPos;
13	java.io.OutputStream _stream;
14
15	public void Create(int windowSize)
16	{
17		if (_buffer == null || _windowSize != windowSize)
18			_buffer = new byte[windowSize];
19		_windowSize = windowSize;
20		_pos = 0;
21		_streamPos = 0;
22	}
23
24	public void SetStream(java.io.OutputStream stream) throws IOException
25	{
26		ReleaseStream();
27		_stream = stream;
28	}
29
30	public void ReleaseStream() throws IOException
31	{
32		Flush();
33		_stream = null;
34	}
35
36	public void Init(boolean solid)
37	{
38		if (!solid)
39		{
40			_streamPos = 0;
41			_pos = 0;
42		}
43	}
44
45	public void Flush() throws IOException
46	{
47		int size = _pos - _streamPos;
48		if (size == 0)
49			return;
50		_stream.write(_buffer, _streamPos, size);
51		if (_pos >= _windowSize)
52			_pos = 0;
53		_streamPos = _pos;
54	}
55
56	public void CopyBlock(int distance, int len) throws IOException
57	{
58		int pos = _pos - distance - 1;
59		if (pos < 0)
60			pos += _windowSize;
61		for (; len != 0; len--)
62		{
63			if (pos >= _windowSize)
64				pos = 0;
65			_buffer[_pos++] = _buffer[pos++];
66			if (_pos >= _windowSize)
67				Flush();
68		}
69	}
70
71	public void PutByte(byte b) throws IOException
72	{
73		_buffer[_pos++] = b;
74		if (_pos >= _windowSize)
75			Flush();
76	}
77
78	public byte GetByte(int distance)
79	{
80		int pos = _pos - distance - 1;
81		if (pos < 0)
82			pos += _windowSize;
83		return _buffer[pos];
84	}
85}
86