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using System.IO;
namespace SharpCompress.IO
{
internal class RewindableStream : Stream
{
private readonly Stream stream;
private MemoryStream bufferStream = new MemoryStream();
private bool isRewound;
private bool isDisposed;
public RewindableStream(Stream stream)
{
this.stream = stream;
}
internal bool IsRecording { get; private set; }
protected override void Dispose(bool disposing)
{
if (isDisposed)
{
return;
}
isDisposed = true;
base.Dispose(disposing);
if (disposing)
{
stream.Dispose();
}
}
public void Rewind(bool stopRecording)
{
isRewound = true;
IsRecording = !stopRecording;
bufferStream.Position = 0;
}
public void Rewind(MemoryStream buffer)
{
if (bufferStream.Position >= buffer.Length)
{
bufferStream.Position -= buffer.Length;
}
else
{
bufferStream.TransferTo(buffer);
bufferStream = buffer;
bufferStream.Position = 0;
}
isRewound = true;
}
public void StartRecording()
{
//if (isRewound && bufferStream.Position != 0)
// throw new System.NotImplementedException();
if (bufferStream.Position != 0)
{
byte[] data = bufferStream.ToArray();
long position = bufferStream.Position;
bufferStream.SetLength(0);
bufferStream.Write(data, (int)position, data.Length - (int)position);
bufferStream.Position = 0;
}
IsRecording = true;
}
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()
{
throw new System.NotImplementedException();
}
public override long Length
{
get { throw new System.NotImplementedException(); }
}
public override long Position
{
get { return stream.Position + bufferStream.Position - bufferStream.Length; }
set
{
if (!isRewound)
{
stream.Position = value;
}
else if (value < stream.Position - bufferStream.Length || value >= stream.Position)
{
stream.Position = value;
isRewound = false;
bufferStream.SetLength(0);
}
else
{
bufferStream.Position = value - stream.Position + bufferStream.Length;
}
}
}
public override int Read(byte[] buffer, int offset, int count)
{
int read;
if (isRewound && bufferStream.Position != bufferStream.Length)
{
read = bufferStream.Read(buffer, offset, count);
if (read < count)
{
int tempRead = stream.Read(buffer, offset + read, count - read);
if (IsRecording)
{
bufferStream.Write(buffer, offset + read, tempRead);
}
read += tempRead;
}
if (bufferStream.Position == bufferStream.Length && !IsRecording)
{
isRewound = false;
bufferStream.SetLength(0);
}
return read;
}
read = stream.Read(buffer, offset, count);
if (IsRecording)
{
bufferStream.Write(buffer, offset, read);
}
return read;
}
public override long Seek(long offset, SeekOrigin origin)
{
throw new System.NotImplementedException();
}
public override void SetLength(long value)
{
throw new System.NotImplementedException();
}
public override void Write(byte[] buffer, int offset, int count)
{
throw new System.NotImplementedException();
}
}
}
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