/// <summary>
/// Reads data from this stream and stores it in the specified array.
/// </summary>
/// <param name="buffer">A byte array that receives the bytes read from
/// the stream.</param>
/// <param name="offset">The zero-based index into the buffer at which to
/// begin storing the data read from this stream.</param>
/// <param name="count">The the maximum number of bytes to read from the
/// stream.</param>
/// <returns>The the number of bytes read from the underlying stream. When
/// there is no more data to be read, returns 0.</returns>
/// <exception cref="IOException">The read operation failed.</exception>
public override int Read(byte[] buffer, int offset, int count)
{
if (state == FilterStreamState.WaitingForServerResponse)
{
// We need to receive the server response, before we can satisfy
// any reads.
ReadServerResponse();
state = FilterStreamState.SatisfyRead;
}
if (state != FilterStreamState.SatisfyRead)
{
throw new IOException("Unexpected Read call.");
}
// This really shouldn't happen but who knows.
if (count > (receivedData.Length - receivedConsumed))
{
throw new IOException("Read passed the end of received data.");
}
Array.Copy(receivedData, receivedConsumed, buffer, offset, count);
receivedConsumed += count;
// Read buffer is empty. We don't expect another call to read for now.
if (receivedConsumed == receivedData.Length)
{
state = FilterStreamState.ReadingHandshake;
}
return(count);
}
/// <summary>
/// Write the specified number of bytes to the underlying stream using the
/// specified buffer and offset.
/// </summary>
/// <param name="buffer">A byte array that supplies the bytes written to
/// the stream.</param>
/// <param name="offset">The zero-based index in the buffer at which to
/// begin reading bytes to be written to the stream.</param>
/// <param name="count">The number of bytes to read from buffer.</param>
/// <exception cref="IOException">The write operation failed.</exception>
public override void Write(byte[] buffer, int offset, int count)
{
switch (state)
{
case FilterStreamState.ReadingHandshake:
if (ReadHandshake(buffer, offset, count))
{
state = FilterStreamState.ReadingPayload;
}
break;
case FilterStreamState.ReadingPayload:
if (ReadPayload(buffer, offset, count))
{
if (SendPayload())
{
state = FilterStreamState.SatisfyRead;
// Put a fake handshake into the client's receive buffer to
// play along with the NegotiateStream protocol.
receivedData = new Handshake(HandshakeType.HandshakeDone, 0).Serialize();
receivedConsumed = 0;
}
else
{
state = FilterStreamState.WaitingForServerResponse;
}
}
break;
default:
throw new IOException("Unexpected Write call.");
}
}
/// <summary>
/// Reads the client's handshake from the specified buffer.
/// </summary>
/// <param name="buffer">A byte array from which the handshake data
/// will be read.</param>
/// <param name="offset">The zero-based index in the buffer at which to
/// begin reading bytes.</param>
/// <param name="count">The number of bytes to read from buffer.</param>
/// <returns>True if the handshake has been read completely, otherwise
/// false.</returns>
bool ReadHandshake(byte[] buffer, int offset, int count)
{
// Accumulate data into buffer until 5 bytes have been read.
int read = Math.Min(count, 5 - handshakeData.Length);
handshakeData.Append(buffer, offset, read);
if (handshakeData.Length == 5)
{
// We're now expecting the payload data.
state = FilterStreamState.ReadingPayload;
handshake = Handshake.Deserialize(handshakeData.ToArray());
handshakeData.Clear();
// Append rest of buffer to payloadData.
payloadData.Append(buffer, offset + read, count - read);
return(true);
}
// We haven't read 5 bytes yet.
return(false);
}
/// <summary>
/// Reads data from this stream and stores it in the specified array.
/// </summary>
/// <param name="buffer">A byte array that receives the bytes read from
/// the stream.</param>
/// <param name="offset">The zero-based index into the buffer at which to
/// begin storing the data read from this stream.</param>
/// <param name="count">The the maximum number of bytes to read from the
/// stream.</param>
/// <returns>The the number of bytes read from the underlying stream. When
/// there is no more data to be read, returns 0.</returns>
/// <exception cref="IOException">The read operation failed.</exception>
public override int Read(byte[] buffer, int offset, int count) {
if (state == FilterStreamState.WaitingForServerResponse) {
// We need to receive the server response, before we can satisfy
// any reads.
ReadServerResponse();
state = FilterStreamState.SatisfyRead;
}
if (state != FilterStreamState.SatisfyRead)
throw new IOException("Unexpected Read call.");
// This really shouldn't happen but who knows.
if (count > (receivedData.Length - receivedConsumed))
throw new IOException("Read passed the end of received data.");
Array.Copy(receivedData, receivedConsumed, buffer, offset, count);
receivedConsumed += count;
// Read buffer is empty. We don't expect another call to read for now.
if (receivedConsumed == receivedData.Length)
state = FilterStreamState.ReadingHandshake;
return count;
}
/// <summary>
/// Reads the client's handshake from the specified buffer.
/// </summary>
/// <param name="buffer">A byte array from which the handshake data
/// will be read.</param>
/// <param name="offset">The zero-based index in the buffer at which to
/// begin reading bytes.</param>
/// <param name="count">The number of bytes to read from buffer.</param>
/// <returns>True if the handshake has been read completely, otherwise
/// false.</returns>
bool ReadHandshake(byte[] buffer, int offset, int count) {
// Accumulate data into buffer until 5 bytes have been read.
int read = Math.Min(count, 5 - handshakeData.Length);
handshakeData.Append(buffer, offset, read);
if (handshakeData.Length == 5) {
// We're now expecting the payload data.
state = FilterStreamState.ReadingPayload;
handshake = Handshake.Deserialize(handshakeData.ToArray());
handshakeData.Clear();
// Append rest of buffer to payloadData.
payloadData.Append(buffer, offset + read, count - read);
return true;
}
// We haven't read 5 bytes yet.
return false;
}
/// <summary>
/// Write the specified number of bytes to the underlying stream using the
/// specified buffer and offset.
/// </summary>
/// <param name="buffer">A byte array that supplies the bytes written to
/// the stream.</param>
/// <param name="offset">The zero-based index in the buffer at which to
/// begin reading bytes to be written to the stream.</param>
/// <param name="count">The number of bytes to read from buffer.</param>
/// <exception cref="IOException">The write operation failed.</exception>
public override void Write(byte[] buffer, int offset, int count) {
switch (state) {
case FilterStreamState.ReadingHandshake:
if (ReadHandshake(buffer, offset, count))
state = FilterStreamState.ReadingPayload;
break;
case FilterStreamState.ReadingPayload:
if (ReadPayload(buffer, offset, count)) {
if (SendPayload()) {
state = FilterStreamState.SatisfyRead;
// Put a fake handshake into the client's receive buffer to
// play along with the NegotiateStream protocol.
receivedData = new Handshake(HandshakeType.HandshakeDone, 0).Serialize();
receivedConsumed = 0;
} else {
state = FilterStreamState.WaitingForServerResponse;
}
}
break;
default:
throw new IOException("Unexpected Write call.");
}
}
private bool ReadHandshake(byte[] buffer, int offset, int count)
{
int read = Math.Min(count, 5 - handshakeData.Length);
this.handshakeData.Append(buffer, offset, read);
if (this.handshakeData.Length == 5)
{
this.state = FilterStreamState.ReadingPayload;
this.handshake = Handshake.Deserialize(this.handshakeData.ToArray());
this.handshakeData.Clear();
this.payloadData.Append(buffer, offset + read, count - read);
return true;
}
return false;
}
public override void Write(byte[] buffer, int offset, int count)
{
switch (this.state)
{
case FilterStreamState.ReadingHandshake:
if (this.ReadHandshake(buffer, offset, count))
{
this.state = FilterStreamState.ReadingPayload;
}
break;
case FilterStreamState.ReadingPayload:
if (this.ReadPayload(buffer, offset, count))
{
if (this.SendPayload())
{
this.state = FilterStreamState.SatisfyRead;
this.receivedData = new Handshake(HandshakeType.HandshakeDone, 0).Serialize();
this.receivedConsumed = 0;
}
else
{
this.state = FilterStreamState.WaitingForServerResponse;
}
}
break;
default:
throw new IOException("Unexpected Write call.");
}
}
public override int Read(byte[] buffer, int offset, int count)
{
if (this.state == FilterStreamState.WaitingForServerResponse)
{
this.ReadServerResponse();
this.state = FilterStreamState.SatisfyRead;
}
if (this.state != FilterStreamState.SatisfyRead)
{
throw new IOException("Unexpected Read call.");
}
if (count > (this.receivedData.Length - this.receivedConsumed))
{
throw new IOException("Read passed the end of received data.");
}
Array.Copy(this.receivedData, this.receivedConsumed, buffer, offset, count);
this.receivedConsumed += count;
if (this.receivedConsumed == this.receivedData.Length)
{
this.state = FilterStreamState.ReadingHandshake;
}
return count;
}