protected function readInt32( $pos = 0 ) {
		static $lookups;

		if ( !$lookups ) {
			$lookups = [];
			for ( $i = 1; $i < 256; $i++ ) {
				$lookups[ chr( $i ) ] = $i;
			}
		}

		$buf = $this->read( $pos, 4 );

		$rv = 0;

		if ( $buf[0] !== "\x0" ) {
			$rv = $lookups[ $buf[0] ];
		}
		if ( $buf[1] !== "\x0" ) {
			$rv |= ( $lookups[ $buf[1] ] << 8 );
		}
		if ( $buf[2] !== "\x0" ) {
			$rv |= ( $lookups[ $buf[2] ] << 16 );
		}
		if ( $buf[3] !== "\x0" ) {
			$rv |= ( $lookups[ $buf[3] ] << 24 );
		}

		return $rv;
	}
protected function readInt32( $pos = 0 ) {
		static $lookups;

		if ( !$lookups ) {
			$lookups = [];
			for ( $i = 1; $i < 256; $i++ ) {
				$lookups[ chr( $i ) ] = $i;
			}
		}

		$buf = $this->read( $pos, 4 );

		$rv = 0;

		if ( $buf[0] !== "\x0" ) {
			$rv = $lookups[ $buf[0] ];
		}
		if ( $buf[1] !== "\x0" ) {
			$rv |= ( $lookups[ $buf[1] ] << 8 );
		}
		if ( $buf[2] !== "\x0" ) {
			$rv |= ( $lookups[ $buf[2] ] << 16 );
		}
		if ( $buf[3] !== "\x0" ) {
			$rv |= ( $lookups[ $buf[3] ] << 24 );
		}

		return $rv;
	}
protected function readInt32 ( $ pos = 0 ) { static $ lookups ; if ( ! $ lookups ) { $ lookups = [ ] ; for ( $ i = 1 ; $ i < 256 ; $ i ++ ) { $ lookups [ chr ( $ i ) ] = $ i ; } } $ buf = $ this -> read ( $ pos , 4 ) ; $ rv = 0 ; if ( $ buf [ 0 ] !== "\x0" ) { $ rv = $ lookups [ $ buf [ 0 ] ] ; } if ( $ buf [ 1 ] !== "\x0" ) { $ rv |= ( $ lookups [ $ buf [ 1 ] ] << 8 ) ; } if ( $ buf [ 2 ] !== "\x0" ) { $ rv |= ( $ lookups [ $ buf [ 2 ] ] << 16 ) ; } if ( $ buf [ 3 ] !== "\x0" ) { $ rv |= ( $ lookups [ $ buf [ 3 ] ] << 24 ) ; } return $ rv ; }
Unpack a 32-bit integer.

@param int $pos
@return int
Unpack a 32 - bit integer .