private static IEnumerable <Future> PipeToIterator(this Stream input, Stream output, byte[] buffer)
{
bool readAsync = input.CanReadAsync();
bool writeAsync = output.CanWriteAsync();
while (true)
{
int read;
if (readAsync)
{
var readFuture = Future.FromAsyncPattern <int>(
ac => input.BeginRead(buffer, 0, buffer.Length, ac, null),
input.EndRead);
yield return(readFuture);
read = readFuture.Result;
}
else
{
read = input.Read(buffer, 0, buffer.Length);
}
if (read == 0)
{
yield break;
}
if (writeAsync)
{
yield return(Future.FromAsyncPattern(
ac => output.BeginWrite(buffer, 0, read, ac, null),
ar =>
{
output.EndWrite(ar);
return 0;
}));
}
else
{
output.Write(buffer, 0, read);
}
}
}