<?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): array
{
$stream = fopen($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 {
throw new InvalidResourceException('MO stream content has an invalid format.');
}
// formatRevision
$this->readLong($stream, $isBigEndian);
$count = $this->readLong($stream, $isBigEndian);
$offsetId = $this->readLong($stream, $isBigEndian);
$offsetTranslated = $this->readLong($stream, $isBigEndian);
// sizeHashes
$this->readLong($stream, $isBigEndian);
// offsetHashes
$this->readLong($stream, $isBigEndian);
$messages = [];
for ($i = 0; $i < $count; ++$i) {
$pluralId = null;
$translated = null;
fseek($stream, $offsetId + $i * 8);
$length = $this->readLong($stream, $isBigEndian);
$offset = $this->readLong($stream, $isBigEndian);
if ($length < 1) {
continue;
}
fseek($stream, $offset);
$singularId = fread($stream, $length);
if (str_contains($singularId, "\000")) {
[$singularId, $pluralId] = explode("\000", $singularId);
}
fseek($stream, $offsetTranslated + $i * 8);
$length = $this->readLong($stream, $isBigEndian);
$offset = $this->readLong($stream, $isBigEndian);
if ($length < 1) {
continue;
}
fseek($stream, $offset);
$translated = fread($stream, $length);
if (str_contains($translated, "\000")) {
$translated = explode("\000", $translated);
}
$ids = ['singular' => $singularId, 'plural' => $pluralId];
$item = compact('ids', 'translated');
if (!empty($item['ids']['singular'])) {
$id = $item['ids']['singular'];
if (isset($item['ids']['plural'])) {
$id .= '|'.$item['ids']['plural'];
}
$messages[$id] = stripcslashes(implode('|', (array) $item['translated']));
}
}
fclose($stream);
return array_filter($messages);
}
/**
* Reads an unsigned long from stream respecting endianness.
*
* @param resource $stream
*/
private function readLong($stream, bool $isBigEndian): int
{
$result = unpack($isBigEndian ? 'N1' : 'V1', fread($stream, 4));
$result = current($result);
return (int) substr($result, -8);
}
}
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