POMO_Reader WordPress Class

	class POMO_Reader {

		public $endian = 'little';
		public $_post  = '';

		/**
		 * PHP5 constructor.
		 */
		public function __construct() {
			if ( function_exists( 'mb_substr' )
				&& ( (int) ini_get( 'mbstring.func_overload' ) & 2 ) // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated
			) {
				$this->is_overloaded = true;
			} else {
				$this->is_overloaded = false;
			}

			$this->_pos = 0;
		}

		/**
		 * PHP4 constructor.
		 *
		 * @deprecated 5.4.0 Use __construct() instead.
		 *
		 * @see POMO_Reader::__construct()
		 */
		public function POMO_Reader() {
			_deprecated_constructor( self::class, '5.4.0', static::class );
			self::__construct();
		}

		/**
		 * Sets the endianness of the file.
		 *
		 * @param string $endian Set the endianness of the file. Accepts 'big', or 'little'.
		 */
		public function setEndian( $endian ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.MethodNameInvalid
			$this->endian = $endian;
		}

		/**
		 * Reads a 32bit Integer from the Stream
		 *
		 * @return mixed The integer, corresponding to the next 32 bits from
		 *  the stream of false if there are not enough bytes or on error
		 */
		public function readint32() {
			$bytes = $this->read( 4 );
			if ( 4 != $this->strlen( $bytes ) ) {
				return false;
			}
			$endian_letter = ( 'big' === $this->endian ) ? 'N' : 'V';
			$int           = unpack( $endian_letter, $bytes );
			return reset( $int );
		}

		/**
		 * Reads an array of 32-bit Integers from the Stream
		 *
		 * @param int $count How many elements should be read
		 * @return mixed Array of integers or false if there isn't
		 *  enough data or on error
		 */
		public function readint32array( $count ) {
			$bytes = $this->read( 4 * $count );
			if ( 4 * $count != $this->strlen( $bytes ) ) {
				return false;
			}
			$endian_letter = ( 'big' === $this->endian ) ? 'N' : 'V';
			return unpack( $endian_letter . $count, $bytes );
		}

		/**
		 * @param string $string
		 * @param int    $start
		 * @param int    $length
		 * @return string
		 */
		public function substr( $string, $start, $length ) {
			if ( $this->is_overloaded ) {
				return mb_substr( $string, $start, $length, 'ascii' );
			} else {
				return substr( $string, $start, $length );
			}
		}

		/**
		 * @param string $string
		 * @return int
		 */
		public function strlen( $string ) {
			if ( $this->is_overloaded ) {
				return mb_strlen( $string, 'ascii' );
			} else {
				return strlen( $string );
			}
		}

		/**
		 * @param string $string
		 * @param int    $chunk_size
		 * @return array
		 */
		public function str_split( $string, $chunk_size ) {
			if ( ! function_exists( 'str_split' ) ) {
				$length = $this->strlen( $string );
				$out    = array();
				for ( $i = 0; $i < $length; $i += $chunk_size ) {
					$out[] = $this->substr( $string, $i, $chunk_size );
				}
				return $out;
			} else {
				return str_split( $string, $chunk_size );
			}
		}

		/**
		 * @return int
		 */
		public function pos() {
			return $this->_pos;
		}

		/**
		 * @return true
		 */
		public function is_resource() {
			return true;
		}

		/**
		 * @return true
		 */
		public function close() {
			return true;
		}
	}