int ProcessReadOrWrite(ref AsyncProtocolRequest nestedRequest, ref BufferOffsetSize2 internalBuffer, AsyncOperation operation, BufferOffsetSize userBuffer, LazyAsyncResult lazyResult)
{
if (userBuffer == null || userBuffer.Buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (userBuffer.Offset < 0)
{
throw new ArgumentOutOfRangeException("offset");
}
if (userBuffer.Size < 0 || userBuffer.Offset + userBuffer.Size > userBuffer.Buffer.Length)
{
throw new ArgumentOutOfRangeException("count");
}
CheckThrow(true);
var name = internalBuffer == readBuffer ? "read" : "write";
Debug("ProcessReadOrWrite: {0} {1}", name, userBuffer);
var asyncRequest = new AsyncProtocolRequest(this, lazyResult, userBuffer);
return(StartOperation(ref nestedRequest, ref internalBuffer, operation, asyncRequest, name));
}
int StartOperation(ref AsyncProtocolRequest nestedRequest, ref BufferOffsetSize2 internalBuffer, AsyncOperation operation, AsyncProtocolRequest asyncRequest, string name)
{
if (Interlocked.CompareExchange(ref nestedRequest, asyncRequest, null) != null)
{
throw new InvalidOperationException("Invalid nested call.");
}
bool failed = false;
try {
internalBuffer.Reset();
asyncRequest.StartOperation(operation);
return(asyncRequest.UserResult);
} catch (Exception e) {
failed = true;
if (e is IOException)
{
throw;
}
throw new IOException(name + " failed", e);
} finally {
if (asyncRequest.UserAsyncResult == null || failed)
{
internalBuffer.Reset();
nestedRequest = null;
}
}
}
IAsyncResult BeginReadOrWrite(ref AsyncProtocolRequest nestedRequest, ref BufferOffsetSize2 internalBuffer, AsyncOperation operation, BufferOffsetSize userBuffer, AsyncCallback asyncCallback, object asyncState)
{
LazyAsyncResult lazyResult = new LazyAsyncResult(this, asyncState, asyncCallback);
ProcessReadOrWrite(ref nestedRequest, ref internalBuffer, operation, userBuffer, lazyResult);
return(lazyResult);
}
bool InternalWrite(AsyncProtocolRequest asyncRequest, BufferOffsetSize2 internalBuffer, byte[] buffer, int offset, int size)
{
Debug("InternalWrite: {0} {1} {2} {3}", asyncRequest != null, internalBuffer, offset, size);
if (asyncRequest == null)
{
/*
* The only situation where 'asyncRequest' could possibly be 'null' is when we're called
* from within SSLClose() - which might attempt to send the close_notity notification.
* Since this notification message is very small, it should definitely fit into our internal
* buffer, so we just save it in there and after SSLClose() returns, the final call to
* InternalFlush() - just before closing the underlying stream - will send it out.
*/
if (lastException != null)
{
return(false);
}
if (Interlocked.Exchange(ref closeRequested, 1) == 0)
{
internalBuffer.Reset();
}
else if (internalBuffer.Remaining == 0)
{
throw new InvalidOperationException();
}
}
/*
* Normal write - can be either SSLWrite() or SSLHandshake().
*
* It is important that we always accept all the data and queue it.
*/
internalBuffer.AppendData(buffer, offset, size);
/*
* Calling 'asyncRequest.RequestWrite()' here ensures that ProcessWrite() is called next
* time we regain control from native code.
*
* During the handshake, the native code won't actually realize (unless if attempts to send
* so much that the write buffer gets full) that we only buffered the data.
*
* However, it doesn't matter because it will either return with a completed handshake
* (and doesn't care whether the remote actually received the data) or it will expect more
* data from the remote and request a read. In either case, we regain control in managed
* code and can flush out the data.
*
* Note that a calling RequestWrite() followed by RequestRead() will first flush the write
* queue once we return to managed code - before attempting to read anything.
*/
if (asyncRequest != null)
{
asyncRequest.RequestWrite();
}
return(true);
}
public MobileAuthenticatedStream(Stream innerStream, bool leaveInnerStreamOpen, MonoTlsSettings settings, AppleTlsProvider provider)
: base(innerStream, leaveInnerStreamOpen)
{
Settings = settings;
Provider = provider;
readBuffer = new BufferOffsetSize2(16834);
writeBuffer = new BufferOffsetSize2(16384);
}
