private async Task EnsuranceBuffer()
{
if (_buffer.Count == 0)
{
_buffer = await _allocator.AllocateAsync(_bufferSize).WithoutCapturingContext();
}
}
public override async Task <int> ReadAsync(byte[] array, int offset, int count, CancellationToken cancellationToken)
{
int n = _readLen - _readPos;
if (n == 0)
{
if (_writePos > 0)
{
await FlushWriteAsync();
}
if (count > _bufferSize)
{
n = _s.Read(array, offset, count);
// Throw away read buffer.
_readPos = 0;
_readLen = 0;
return(n);
}
if (_buffer.Count == 0)
{
_buffer = await _allocator.AllocateAsync(_bufferSize);
}
n = await _s.ReadAsync(_buffer.Array, _buffer.Offset, _buffer.Count);
if (n == 0)
{
return(0);
}
_readPos = 0;
_readLen = n;
}
if (n > count)
{
n = count;
}
Buffer.BlockCopy(_buffer.Array, _buffer.Offset + _readPos, array, offset, n);
_readPos += n;
return(n);
}