vendor/symfony/translation/Loader/MoFileLoader.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Translation\Loader;

use Symfony\Component\Translation\Exception\InvalidResourceException;

/**
 * @copyright Copyright (c) 2010, Union of RAD http://union-of-rad.org (http://lithify.me/)
 */
class MoFileLoader extends FileLoader
{
    /**
     * Magic used for validating the format of an MO file as well as
     * detecting if the machine used to create that file was little endian.
     */
    public const MO_LITTLE_ENDIAN_MAGIC = 0x950412DE;

    /**
     * Magic used for validating the format of an MO file as well as
     * detecting if the machine used to create that file was big endian.
     */
    public const MO_BIG_ENDIAN_MAGIC = 0xDE120495;

    /**
     * The size of the header of an MO file in bytes.
     */
    public const MO_HEADER_SIZE = 28;

    /**
     * Parses machine object (MO) format, independent of the machine's endian it
     * was created on. Both 32bit and 64bit systems are supported.
     *
     * {@inheritdoc}
     */
    protected function loadResource(string $resource)
    {
        $stream = fopen($resource, 'r');

        $stat = fstat($stream);

        if ($stat['size'] < self::MO_HEADER_SIZE) {
            throw new InvalidResourceException('MO stream content has an invalid format.');
        }
        $magic = unpack('V1', fread($stream, 4));
        $magic = hexdec(substr(dechex(current($magic)), -8));

        if (self::MO_LITTLE_ENDIAN_MAGIC == $magic) {
            $isBigEndian = false;
        } elseif (self::MO_BIG_ENDIAN_MAGIC == $magic) {
            $isBigEndian = true;
        } else {