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using System;
using System.IO;
namespace Google.Protobuf
{
/// <summary>
/// Stream implementation which proxies another stream, only allowing a certain amount
/// of data to be read. Note that this is only used to read delimited streams, so it
/// doesn't attempt to implement everything.
/// </summary>
internal sealed class LimitedInputStream : Stream
{
private readonly Stream proxied;
private int bytesLeft;
internal LimitedInputStream(Stream proxied, int size)
{
this.proxied = proxied;
bytesLeft = size;
}
public override bool CanRead
{
get { return true; }
}
public override bool CanSeek
{
get { return false; }
}
public override bool CanWrite
{
get { return false; }
}
public override void Flush()
{
}
public override long Length
{
get { throw new NotSupportedException(); }
}
public override long Position
{
get { throw new NotSupportedException(); }
set { throw new NotSupportedException(); }
}
public override int Read(byte[] buffer, int offset, int count)
{
if (bytesLeft > 0)
{
int bytesRead = proxied.Read(buffer, offset, Math.Min(bytesLeft, count));
bytesLeft -= bytesRead;
return bytesRead;
}
return 0;
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override void SetLength(long value)
{
throw new NotSupportedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotSupportedException();
}
}
}
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