bool HandleWriteCharacters(IAsyncResult result)
{
int byteCount = Math.Min(bufferLength / 4 * 3, count - count % 3);
int charCount = byteCount / 3 * 4;
int charOffset;
if (result == null)
{
result = writer.BeginGetBuffer(charCount, onWriteCharacters, this);
if (!result.CompletedSynchronously)
{
return(false);
}
}
byte[] chars = writer.EndGetBuffer(result, out charOffset);
writer.Advance(encoding.GetChars(this.buffer, this.offset, byteCount, chars, charOffset));
this.offset += byteCount;
this.count -= byteCount;
return(true);
}
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);
}