question: public int read ( byte [ ] b , int off , int len ) throws IOException { if ( closed ) { throw new IOException ( "Attempted read from closed stream." ) ; } if ( eof ) { return - 1 ; } if ( pos >= chunkSize ) { nextChunk ( ) ; if ( eof ) { return - 1 ; } } len = Math . min ( len , chunkSize - pos ) ; int count = in . read ( b , off , len ) ; pos += count ; return count ; }
target:  Read some bytes from the stream.