public static async Task CopyToAsync(
this Stream istream,
Stream ostream,
IBufferProvider bufferProvider,
CancellationToken token,
Action <long> progressIncreased)
{
var buffer = await bufferProvider.AllocBufferAsync();
try
{
while (!token.IsCancellationRequested)
{
int readLen = await istream.ReadAsync(buffer, 0, buffer.Length, token);
if (readLen <= 0)
{
break;
}
await ostream.WriteAsync(buffer, 0, readLen, token);
progressIncreased(readLen);
}
}
catch (TaskCanceledException) { }
finally
{
bufferProvider.ReleaseBuffer(buffer);
}
}
