/// <summary>
/// Straight copy from the reader to the writer
/// </summary>
public static async Task CopyToAsync(this IReadAsyncStream readStream, IWriteAsyncStream writeStream, CancellationToken ct)
{
// We have the double exception catching to avoid the using() from hiding the inner exception
Exception inner = null;
try
{
using (readStream)
{
try
{
var buffer = new byte[BufferSize];
int read;
do
{
ct.ThrowIfCancellationRequested();
read = await readStream.ReadAsync(buffer, 0, buffer.Length, ct).ConfigureAwait(false);
if (read > 0)
{
ct.ThrowIfCancellationRequested();
await writeStream.WriteAsync(buffer, 0, read, ct).ConfigureAwait(false);
}
} while (read > 0);
}
catch (Exception e)
{
inner = e;
throw;
}
}
}
catch (Exception)
{
if (inner != null)
{
throw inner;
}
else throw;
}
}
public WriteWriteAsyncStream(IWriteAsyncStream stream, Func<Stream, Stream> writeStack)
{
_stream = stream;
_ms = new MemoryStream();
_watcher = new WriteWatcherStream(_ms, () => { }); // We do this mostly so that the ms is not disposed
_stack = writeStack(_watcher);
}
