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(PrefixStream, StreamRegion): derive from ProxyStream.

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This commit is contained in:
morkt 2016-05-20 20:28:57 +04:00
parent 0c426d723f
commit 8732a8a837
1 changed files with 23 additions and 66 deletions
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89
ArcFormats/CommonStreams.cs
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@ -91,45 +91,35 @@ namespace GameRes.Formats
}
}
public class PrefixStream : Stream
public class PrefixStream : ProxyStream
{
byte[] m_header;
Stream m_stream;
long m_position = 0;
bool m_should_dispose;
public PrefixStream (byte[] header, Stream main, bool leave_open = false)
: base (main, leave_open)
{
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 Length { get { return BaseStream.Length + m_header.Length; } }
public override long Position
{
get { return m_position; }
set
{
if (!m_stream.CanSeek)
if (!BaseStream.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);
long stream_pos = BaseStream.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)
@ -156,9 +146,9 @@ namespace GameRes.Formats
}
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);
if (m_header.Length == m_position && BaseStream.CanSeek)
BaseStream.Position = 0;
int stream_read = BaseStream.Read (buffer, offset, count);
m_position += stream_read;
read += stream_read;
}
@ -169,9 +159,9 @@ namespace GameRes.Formats
{
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 (m_position == m_header.Length && BaseStream.CanSeek)
BaseStream.Position = 0;
int b = BaseStream.ReadByte();
if (-1 != b)
m_position++;
return b;
@ -191,38 +181,23 @@ namespace GameRes.Formats
{
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
public class StreamRegion : ProxyStream
{
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)
: base (main, leave_open)
{
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;
m_end = Math.Min (offset + length, BaseStream.Length);
BaseStream.Position = m_begin;
}
public StreamRegion (Stream main, long offset, bool leave_open = false)
@ -230,19 +205,13 @@ namespace GameRes.Formats
{
}
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();
get { return BaseStream.Position - m_begin; }
set { BaseStream.Position = Math.Max (m_begin + value, m_begin); }
}
public override long Seek (long offset, SeekOrigin origin)
@ -250,29 +219,29 @@ namespace GameRes.Formats
if (SeekOrigin.Begin == origin)
offset += m_begin;
else if (SeekOrigin.Current == origin)
offset += m_stream.Position;
offset += BaseStream.Position;
else
offset += m_end;
offset = Math.Max (offset, m_begin);
m_stream.Position = offset;
BaseStream.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;
long available = m_end - BaseStream.Position;
if (available > 0)
{
read = m_stream.Read (buffer, offset, (int)Math.Min (count, available));
read = BaseStream.Read (buffer, offset, (int)Math.Min (count, available));
}
return read;
}
public override int ReadByte ()
{
if (m_stream.Position < m_end)
return m_stream.ReadByte();
if (BaseStream.Position < m_end)
return BaseStream.ReadByte();
else
return -1;
}
@ -291,18 +260,6 @@ namespace GameRes.Formats
{
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);
}
}
}
/// <summary>