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using System;
using System.Diagnostics;
using System.IO;
namespace Org.BouncyCastle.Utilities.IO
{
public abstract class BaseInputStream : Stream
{
private bool closed;
public sealed override bool CanRead { get { return !closed; } }
public sealed override bool CanSeek { get { return false; } }
public sealed override bool CanWrite { get { return false; } }
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
closed = true;
}
public sealed override void Flush() {}
public sealed override long Length { get { throw new NotSupportedException(); } }
public sealed override long Position
{
get { throw new NotSupportedException(); }
set { throw new NotSupportedException(); }
}
public override int Read(byte[] buffer, int offset, int count)
{
int pos = offset;
try
{
int end = offset + count;
while (pos < end)
{
int b = ReadByte();
if (b == -1) break;
buffer[pos++] = (byte) b;
}
}
catch (IOException)
{
if (pos == offset) throw;
}
return pos - offset;
}
public sealed override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); }
public sealed override void SetLength(long value) { throw new NotSupportedException(); }
public sealed override void Write(byte[] buffer, int offset, int count) { throw new NotSupportedException(); }
}
}
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