BufferedInputStream.fillAsync

void fillAsync(ptrdiff_t count,  int  ioPriority,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

Reads data into stream's buffer asynchronously, up to count size. io_priority can be used to prioritize reads. For the synchronous version of this function, see [gio.buffered_input_stream.BufferedInputStream.fill].

If count is -1 then the attempted read size is equal to the number of bytes that are required to fill the buffer.

Parameters

`count`	the number of bytes that will be read from the stream
`ioPriority`	the [I/O priority][io-priority] of the request
`cancellable`	optional #GCancellable object
`callback`	a #GAsyncReadyCallback