fill

Read the next bytes into the destination starting at offset at most length bytes. May block until at least one byte is available. Usually bypass all exceptions from the underlying source.

Parameters

offset - in bytes where result should be written

length - should be at least one byte

Return number of bytes were copied or 0 if EOF encountered

Reads the next chunk suitable for reading or null if no more chunks available. It is also allowed to return a chain of chunks linked through ChunkBuffer.next. The last chunk should have null next reference. Could rethrow exceptions from the underlying source.