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moved common stream classes to separate file.

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morkt
2016-03-13 00:32:02 +04:00
parent b569c81c50
commit 834409f2a4
5 changed files with 389 additions and 357 deletions
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214
ArcFormats/ArcCommon.cs
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@@ -95,220 +95,6 @@ namespace GameRes.Formats
static readonly Lazy<AudioFormat> s_OggFormat = new Lazy<AudioFormat> (() => FormatCatalog.Instance.AudioFormats.FirstOrDefault (x => x.Tag == "OGG"));
}
public class PrefixStream : Stream
{
byte[] m_header;
Stream m_stream;
long m_position = 0;
bool m_should_dispose;
public PrefixStream (byte[] header, Stream main, bool leave_open = false)
{
m_header = header;
m_stream = main;
m_should_dispose = !leave_open;
}
public override bool CanRead { get { return m_stream.CanRead; } }
public override bool CanSeek { get { return m_stream.CanSeek; } }
public override bool CanWrite { get { return false; } }
public override long Length { get { return m_stream.Length + m_header.Length; } }
public override long Position
{
get { return m_position; }
set
{
if (!m_stream.CanSeek)
throw new NotSupportedException ("Underlying stream does not support Stream.Position property");
m_position = Math.Max (value, 0);
if (m_position > m_header.Length)
{
long stream_pos = m_stream.Seek (m_position - m_header.Length, SeekOrigin.Begin);
m_position = m_header.Length + stream_pos;
}
}
}
public override void Flush()
{
m_stream.Flush();
}
public override long Seek (long offset, SeekOrigin origin)
{
if (SeekOrigin.Begin == origin)
Position = offset;
else if (SeekOrigin.Current == origin)
Position = m_position + offset;
else
Position = Length + offset;
return m_position;
}
public override int Read (byte[] buffer, int offset, int count)
{
int read = 0;
if (m_position < m_header.Length)
{
int header_count = Math.Min (count, m_header.Length - (int)m_position);
Buffer.BlockCopy (m_header, (int)m_position, buffer, offset, header_count);
m_position += header_count;
read += header_count;
offset += header_count;
count -= header_count;
}
if (count > 0)
{
if (m_header.Length == m_position && m_stream.CanSeek)
m_stream.Position = 0;
int stream_read = m_stream.Read (buffer, offset, count);
m_position += stream_read;
read += stream_read;
}
return read;
}
public override int ReadByte ()
{
if (m_position < m_header.Length)
return m_header[m_position++];
if (m_position == m_header.Length && m_stream.CanSeek)
m_stream.Position = 0;
int b = m_stream.ReadByte();
if (-1 != b)
m_position++;
return b;
}
public override void SetLength (long length)
{
throw new NotSupportedException ("PrefixStream.SetLength method is not supported");
}
public override void Write (byte[] buffer, int offset, int count)
{
throw new NotSupportedException ("PrefixStream.Write method is not supported");
}
public override void WriteByte (byte value)
{
throw new NotSupportedException ("PrefixStream.WriteByte method is not supported");
}
bool disposed = false;
protected override void Dispose (bool disposing)
{
if (!disposed)
{
if (m_should_dispose && disposing)
m_stream.Dispose();
disposed = true;
base.Dispose (disposing);
}
}
}
/// <summary>
/// Represents a region within existing stream.
/// Underlying stream should allow seeking (CanSeek == true).
/// </summary>
public class StreamRegion : Stream
{
private Stream m_stream;
private long m_begin;
private long m_end;
private bool m_should_dispose;
public StreamRegion (Stream main, long offset, long length, bool leave_open = false)
{
m_stream = main;
m_begin = offset;
m_end = Math.Min (offset + length, m_stream.Length);
m_stream.Position = m_begin;
m_should_dispose = !leave_open;
}
public StreamRegion (Stream main, long offset, bool leave_open = false)
: this (main, offset, main.Length-offset, leave_open)
{
}
public override bool CanRead { get { return m_stream.CanRead; } }
public override bool CanSeek { get { return true; } }
public override bool CanWrite { get { return false; } }
public override long Length { get { return m_end - m_begin; } }
public override long Position
{
get { return m_stream.Position - m_begin; }
set { m_stream.Position = Math.Max (m_begin + value, m_begin); }
}
public override void Flush()
{
m_stream.Flush();
}
public override long Seek (long offset, SeekOrigin origin)
{
if (SeekOrigin.Begin == origin)
offset += m_begin;
else if (SeekOrigin.Current == origin)
offset += m_stream.Position;
else
offset += m_end;
offset = Math.Max (offset, m_begin);
m_stream.Position = offset;
return offset - m_begin;
}
public override int Read (byte[] buffer, int offset, int count)
{
int read = 0;
long available = m_end - m_stream.Position;
if (available > 0)
{
read = m_stream.Read (buffer, offset, (int)Math.Min (count, available));
}
return read;
}
public override int ReadByte ()
{
if (m_stream.Position < m_end)
return m_stream.ReadByte();
else
return -1;
}
public override void SetLength (long length)
{
throw new NotSupportedException ("StreamRegion.SetLength method is not supported");
}
public override void Write (byte[] buffer, int offset, int count)
{
throw new NotSupportedException ("StreamRegion.Write method is not supported");
}
public override void WriteByte (byte value)
{
throw new NotSupportedException ("StreamRegion.WriteByte method is not supported");
}
bool m_disposed = false;
protected override void Dispose (bool disposing)
{
if (!m_disposed)
{
if (m_should_dispose && disposing)
m_stream.Dispose();
m_disposed = true;
base.Dispose (disposing);
}
}
}
public class HuffmanDecoder
{
byte[] m_src;