question: @ Override public int read ( ) throws IOException { if ( buf == null ) { throw new IOException ( ) ; } if ( pos < buf . length ) { return ( buf [ pos ++ ] & 0xFF ) ; } return in . read ( ) ; }
target:  Reads a single byte from this stream and returns it as an integer in the range from 0 to 255. If the pushback buffer does not contain any available bytes then a byte from the source input stream is returned. Blocks until one byte has been read, the end of the source stream is detected or an exception is thrown.