Creates a SourceTOut, TMat from an Stream created by the given function. Emitted elements are chunkSize sized ByteString elements, except the final element, which will be up to chunkSize in size. You can configure the default dispatcher for this Source by changing the "akka.stream.blocking-io-dispatcher" or set it for a given Source by using CreateDispatcher(String). It materializes a TaskTResult of IOResult containing the number of bytes read from the source file upon completion, and a possible exception if IO operation was not completed successfully. The created Stream will be closed when the SourceTOut, TMat is cancelled.

public static Source<ByteString, Task<IOResult>> FromInputStream(
	Func<Stream> createInputStream,
	int chunkSize = 8192
)

static member FromInputStream : 
        createInputStream : Func<Stream> * 
        ?chunkSize : int 
(* Defaults:
        let _chunkSize = defaultArg chunkSize 8192
*)
-> Source<ByteString, Task<IOResult>>