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class POMO_Reader {

	public $endian = 'little';
	public $_pos;
	public $is_overloaded;

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

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

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

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