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(InputProxyStream): generalization of input filters.

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This commit is contained in:
morkt
2016-07-02 06:06:32 +04:00
parent cc22f988c6
commit 883ee94a7e
8 changed files with 39 additions and 174 deletions
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45
ArcFormats/Ikura/ImageGGP.cs
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@@ -87,28 +87,23 @@ namespace GameRes.Formats.Ikura
}
}
internal class EncryptedStream : Stream
internal class EncryptedStream : InputProxyStream
{
private Stream m_stream;
private byte[] m_key;
private long m_position;
private bool m_should_dispose;
public EncryptedStream (Stream main, byte[] key, bool leave_open = false)
: base (main, leave_open)
{
if (null == key)
throw new ArgumentNullException ("key");
if (key.Length < 8)
throw new ArgumentException ("key");
m_stream = main;
m_key = key;
m_position = 0;
m_should_dispose = !leave_open;
}
public override bool CanRead { get { return m_stream.CanRead; } }
public override bool CanSeek { get { return false; } }
public override bool CanWrite { get { return false; } }
public override long Length { get { throw new NotSupportedException(); } }
public override long Position
{
@@ -121,14 +116,9 @@ namespace GameRes.Formats.Ikura
throw new NotSupportedException();
}
public override void Flush()
{
m_stream.Flush();
}
public override int Read (byte[] buffer, int offset, int count)
{
int read = m_stream.Read (buffer, offset, count);
int read = BaseStream.Read (buffer, offset, count);
if (read > 0)
{
for (int i = 0; i < read; ++i)
@@ -141,39 +131,12 @@ namespace GameRes.Formats.Ikura
public override int ReadByte ()
{
int b = m_stream.ReadByte();
int b = BaseStream.ReadByte();
if (-1 != b)
{
b ^= m_key[m_position++ & 7];
}
return b;
}
public override void SetLength (long length)
{
throw new NotSupportedException ("EncryptedStream.SetLength method is not supported");
}
public override void Write (byte[] buffer, int offset, int count)
{
throw new NotSupportedException ("EncryptedStream.Write method is not supported");
}
public override void WriteByte (byte value)
{
throw new NotSupportedException ("EncryptedStream.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);
}
}
}
}