HexParser.php

<?php

namespace BlockTrail\Util;

class HexParser {

    protected $position = 0;

    protected $string = '';

    public function __construct($string) {
        $this->string = $string;
    }

    public function getString() {
        return $this->string;
    }

    public function getCount() {
        return strlen($this->string) / 2;
    }

    public function read($count) {
        $count = $count * 2;
        $this->position += $count;
        return substr($this->string, $this->position - $count, $count);
    }

    public function readDecimal($count) {
        return hexdec($this->read($count));
    }

    public function readString($count) {
        return self::hexToStr($this->read($count));
    }

    public function getPosition() {
        return $this->position;
    }

    public static function hexToStr($hex) {
        $string = '';
        for ($i = 0; $i < strlen($hex) - 1; $i += 2) {
            $string .= chr(hexdec($hex[$i] . $hex[$i + 1]));
        }
        return $string;
    }

    public static function strToHex($string) {
        $hex = '';
        for ($i = 0; $i < strlen($string); $i++) {
            $hex .= dechex(ord($string[$i]));
        }
        return $hex;
    }
}