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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Crypto.IO
{
public class DigestStream
: Stream
{
protected readonly Stream stream;
protected readonly IDigest inDigest;
protected readonly IDigest outDigest;
public DigestStream(
Stream stream,
IDigest readDigest,
IDigest writeDigest)
{
this.stream = stream;
this.inDigest = readDigest;
this.outDigest = writeDigest;
}
public virtual IDigest ReadDigest()
{
return inDigest;
}
public virtual IDigest WriteDigest()
{
return outDigest;
}
public override int Read(
byte[] buffer,
int offset,
int count)
{
int n = stream.Read(buffer, offset, count);
if (inDigest != null)
{
if (n > 0)
{
inDigest.BlockUpdate(buffer, offset, n);
}
}
return n;
}
public override int ReadByte()
{
int b = stream.ReadByte();
if (inDigest != null)
{
if (b >= 0)
{
inDigest.Update((byte)b);
}
}
return b;
}
public override void Write(
byte[] buffer,
int offset,
int count)
{
if (outDigest != null)
{
if (count > 0)
{
outDigest.BlockUpdate(buffer, offset, count);
}
}
stream.Write(buffer, offset, count);
}
public override void WriteByte(
byte b)
{
if (outDigest != null)
{
outDigest.Update(b);
}
stream.WriteByte(b);
}
public override bool CanRead
{
get { return stream.CanRead; }
}
public override bool CanWrite
{
get { return stream.CanWrite; }
}
public override bool CanSeek
{
get { return stream.CanSeek; }
}
public override long Length
{
get { return stream.Length; }
}
public override long Position
{
get { return stream.Position; }
set { stream.Position = value; }
}
#if PORTABLE
protected override void Dispose(bool disposing)
{
if (disposing)
{
Platform.Dispose(stream);
}
base.Dispose(disposing);
}
#else
public override void Close()
{
Platform.Dispose(stream);
base.Close();
}
#endif
public override void Flush()
{
stream.Flush();
}
public override long Seek(
long offset,
SeekOrigin origin)
{
return stream.Seek(offset, origin);
}
public override void SetLength(
long length)
{
stream.SetLength(length);
}
}
}
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