internal virtual AsyncCompletionResult WriteBase64TextAsync(AsyncEventArgs<XmlNodeWriterWriteBase64TextArgs> state)
{
// We do not guard this invocation. The caller of the NodeWriter should ensure that that
// they override the FastAsync guard clause for the XmlDictionaryWriter and that the
// nodeWriter has an implemenation for WriteBase64TextAsync.
throw Fx.AssertAndThrow("WriteBase64TextAsync not implemented.");
}
AsyncCompletionResult InternalWriteBase64TextAsync(AsyncEventArgs<XmlWriteBase64AsyncArguments> writerState)
{
GetBufferAsyncEventArgs bufferState = this.getBufferState;
GetBufferArgs bufferArgs = this.getBufferArgs;
XmlWriteBase64AsyncArguments writerArgs = writerState.Arguments;
if (bufferState == null)
{
// Need to initialize the cached getBufferState
// used to call GetBufferAsync() multiple times.
bufferState = new GetBufferAsyncEventArgs();
bufferArgs = new GetBufferArgs();
this.getBufferState = bufferState;
this.getBufferArgs = bufferArgs;
}
Base64Encoding encoding = XmlConverter.Base64Encoding;
while (writerArgs.Count >= 3)
{
int byteCount = Math.Min(bufferLength / 4 * 3, writerArgs.Count - writerArgs.Count % 3);
int charCount = byteCount / 3 * 4;
bufferArgs.Count = charCount;
bufferState.Set(onGetBufferComplete, bufferArgs, this);
if (writer.GetBufferAsync(bufferState) == AsyncCompletionResult.Completed)
{
GetBufferEventResult getbufferResult = bufferState.Result;
bufferState.Complete(true);
writer.Advance(encoding.GetChars(
writerArgs.Buffer,
writerArgs.Offset,
byteCount,
getbufferResult.Buffer,
getbufferResult.Offset));
writerArgs.Offset += byteCount;
writerArgs.Count -= byteCount;
}
else
{
return AsyncCompletionResult.Queued;
}
}
if (writerArgs.Count > 0)
{
bufferArgs.Count = 4;
bufferState.Set(onGetBufferComplete, bufferArgs, this);
if (writer.GetBufferAsync(bufferState) == AsyncCompletionResult.Completed)
{
GetBufferEventResult getbufferResult = bufferState.Result;
bufferState.Complete(true);
writer.Advance(encoding.GetChars(
writerArgs.Buffer,
writerArgs.Offset,
writerArgs.Count,
getbufferResult.Buffer,
getbufferResult.Offset));
}
else
{
return AsyncCompletionResult.Queued;
}
}
return AsyncCompletionResult.Completed;
}
internal AsyncCompletionResult StartAsync(AsyncEventArgs<XmlNodeWriterWriteBase64TextArgs> xmlNodeWriterState)
{
Fx.Assert(xmlNodeWriterState != null, "xmlNodeWriterState cannot be null.");
Fx.Assert(this.nodeState == null, "nodeState is not null.");
this.nodeState = xmlNodeWriterState;
XmlNodeWriterWriteBase64TextArgs nodeWriterArgs = xmlNodeWriterState.Arguments;
if (nodeWriterArgs.TrailCount > 0)
{
this.writerArgs.Buffer = nodeWriterArgs.TrailBuffer;
this.writerArgs.Offset = 0;
this.writerArgs.Count = nodeWriterArgs.TrailCount;
this.writerState.Set(onTrailByteComplete, this.writerArgs, this);
if (this.InternalWriteBase64TextAsync(this.writerState) != AsyncCompletionResult.Completed)
{
return AsyncCompletionResult.Queued;
}
this.writerState.Complete(true);
}
if (this.WriteBufferAsync() == AsyncCompletionResult.Completed)
{
this.nodeState = null;
return AsyncCompletionResult.Completed;
}
return AsyncCompletionResult.Queued;
}
public InternalWriteBase64TextAsyncWriter(XmlUTF8NodeWriter writer)
{
this.writer = writer;
this.writerState = new AsyncEventArgs<XmlWriteBase64AsyncArguments>();
this.writerArgs = new XmlWriteBase64AsyncArguments();
}
internal override AsyncCompletionResult WriteBase64TextAsync(AsyncEventArgs<XmlNodeWriterWriteBase64TextArgs> xmlNodeWriterState)
{
if (internalWriteBase64TextAsyncWriter == null)
{
internalWriteBase64TextAsyncWriter = new InternalWriteBase64TextAsyncWriter(this);
}
return this.internalWriteBase64TextAsyncWriter.StartAsync(xmlNodeWriterState);
}
AsyncCompletionResult WriteAsync()
{
if (this.writerAsyncState == null)
{
this.writerAsyncArgs = new XmlWriteBase64AsyncArguments();
this.writerAsyncState = new AsyncEventArgs<XmlWriteBase64AsyncArguments>();
}
if (onWriteComplete == null)
{
onWriteComplete = new AsyncEventArgsCallback(OnWriteComplete);
}
this.writerAsyncArgs.Buffer = this.block;
this.writerAsyncArgs.Offset = 0;
this.writerAsyncArgs.Count = this.bytesRead;
this.writerAsyncState.Set(onWriteComplete, this.writerAsyncArgs, this);
if (this.writer.WriteBase64Async(this.writerAsyncState) == AsyncCompletionResult.Completed)
{
this.HandleWriteComplete();
this.writerAsyncState.Complete(true);
return AsyncCompletionResult.Completed;
}
return AsyncCompletionResult.Queued;
}
internal virtual AsyncCompletionResult WriteBase64Async(AsyncEventArgs<XmlWriteBase64AsyncArguments> state)
{
throw FxTrace.Exception.AsError(new NotSupportedException());
}
void Clear()
{
this.inputState = null;
this.buffer = null;
this.offset = 0;
this.count = 0;
this.actualByteCount = 0;
this.totalByteCount = 0;
}
bool HandleWriteBase64Text(bool isAsyncCallback)
{
Fx.Assert(this.count > 0 && this.actualByteCount >= 3, "HandleWriteBase64Text cannot be invoked with less than 3 bytes.");
if (!writer.isXmlnsAttribute)
{
if (!isAsyncCallback)
{
if (this.nodeWriterAsyncState == null)
{
this.nodeWriterAsyncState = new AsyncEventArgs<XmlNodeWriterWriteBase64TextArgs>();
this.nodeWriterArgs = new XmlNodeWriterWriteBase64TextArgs();
}
if (onWriteComplete == null)
{
onWriteComplete = new AsyncEventArgsCallback(OnWriteComplete);
}
this.writer.StartContent();
this.nodeWriterArgs.TrailBuffer = this.writer.trailBytes;
this.nodeWriterArgs.TrailCount = this.writer.trailByteCount;
this.nodeWriterArgs.Buffer = this.buffer;
this.nodeWriterArgs.Offset = this.offset;
this.nodeWriterArgs.Count = this.actualByteCount - this.writer.trailByteCount;
this.nodeWriterAsyncState.Set(onWriteComplete, this.nodeWriterArgs, this);
if (this.writer.writer.WriteBase64TextAsync(this.nodeWriterAsyncState) != AsyncCompletionResult.Completed)
{
return false;
}
this.nodeWriterAsyncState.Complete(true);
}
this.writer.EndContent();
}
this.writer.trailByteCount = (this.totalByteCount - this.actualByteCount);
if (this.writer.trailByteCount > 0)
{
int trailOffset = offset + count - this.writer.trailByteCount;
for (int i = 0; i < this.writer.trailByteCount; i++)
this.writer.trailBytes[i] = this.buffer[trailOffset++];
}
return true;
}
public void SetArguments(AsyncEventArgs<XmlWriteBase64AsyncArguments> inputState)
{
Fx.Assert(inputState != null, "InputState cannot be null.");
this.inputState = inputState;
this.buffer = inputState.Arguments.Buffer;
this.offset = inputState.Arguments.Offset;
this.count = inputState.Arguments.Count;
}
internal override AsyncCompletionResult WriteBase64Async(AsyncEventArgs<XmlWriteBase64AsyncArguments> state)
{
if (this.nodeWriterAsyncHelper == null)
{
this.nodeWriterAsyncHelper = new XmlBaseWriterNodeWriterAsyncHelper(this);
}
this.nodeWriterAsyncHelper.SetArguments(state);
if (this.nodeWriterAsyncHelper.StartAsync() == AsyncCompletionResult.Completed)
{
return AsyncCompletionResult.Completed;
}
return AsyncCompletionResult.Queued;
}
