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MoFileLoader.php

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1	<?php
2
3	/*
4	* This file is part of the Symfony package.
5	*
6	* (c) Fabien Potencier <fabien@symfony.com>
7	*
8	* For the full copyright and license information, please view the LICENSE
9	* file that was distributed with this source code.
10	*/
11	namespace IAWPSCOPED\Symfony\Component\Translation\Loader;
12
13	use IAWPSCOPED\Symfony\Component\Translation\Exception\InvalidResourceException;
14	/**
15	* @copyright Copyright (c) 2010, Union of RAD http://union-of-rad.org (http://lithify.me/)
16	* @internal
17	*/
18	class MoFileLoader extends FileLoader
19	{
20	/**
21	* Magic used for validating the format of an MO file as well as
22	* detecting if the machine used to create that file was little endian.
23	*/
24	public const MO_LITTLE_ENDIAN_MAGIC = 0x950412de;
25	/**
26	* Magic used for validating the format of an MO file as well as
27	* detecting if the machine used to create that file was big endian.
28	*/
29	public const MO_BIG_ENDIAN_MAGIC = 0xde120495;
30	/**
31	* The size of the header of an MO file in bytes.
32	*/
33	public const MO_HEADER_SIZE = 28;
34	/**
35	* Parses machine object (MO) format, independent of the machine's endian it
36	* was created on. Both 32bit and 64bit systems are supported.
37	*
38	* {@inheritdoc}
39	*/
40	protected function loadResource(string $resource)
41	{
42	$stream = \fopen($resource, 'r');
43	$stat = \fstat($stream);
44	if ($stat['size'] < self::MO_HEADER_SIZE) {
45	throw new InvalidResourceException('MO stream content has an invalid format.');
46	}
47	$magic = \unpack('V1', \fread($stream, 4));
48	$magic = \hexdec(\substr(\dechex(\current($magic)), -8));
49	if (self::MO_LITTLE_ENDIAN_MAGIC == $magic) {
50	$isBigEndian = \false;
51	} elseif (self::MO_BIG_ENDIAN_MAGIC == $magic) {
52	$isBigEndian = \true;
53	} else {
54	throw new InvalidResourceException('MO stream content has an invalid format.');
55	}
56	// formatRevision
57	$this->readLong($stream, $isBigEndian);
58	$count = $this->readLong($stream, $isBigEndian);
59	$offsetId = $this->readLong($stream, $isBigEndian);
60	$offsetTranslated = $this->readLong($stream, $isBigEndian);
61	// sizeHashes
62	$this->readLong($stream, $isBigEndian);
63	// offsetHashes
64	$this->readLong($stream, $isBigEndian);
65	$messages = [];
66	for ($i = 0; $i < $count; ++$i) {
67	$pluralId = null;
68	$translated = null;
69	\fseek($stream, $offsetId + $i * 8);
70	$length = $this->readLong($stream, $isBigEndian);
71	$offset = $this->readLong($stream, $isBigEndian);
72	if ($length < 1) {
73	continue;
74	}
75	\fseek($stream, $offset);
76	$singularId = \fread($stream, $length);
77	if (\str_contains($singularId, "\x00")) {
78	[$singularId, $pluralId] = \explode("\x00", $singularId);
79	}
80	\fseek($stream, $offsetTranslated + $i * 8);
81	$length = $this->readLong($stream, $isBigEndian);
82	$offset = $this->readLong($stream, $isBigEndian);
83	if ($length < 1) {
84	continue;
85	}
86	\fseek($stream, $offset);
87	$translated = \fread($stream, $length);
88	if (\str_contains($translated, "\x00")) {
89	$translated = \explode("\x00", $translated);
90	}
91	$ids = ['singular' => $singularId, 'plural' => $pluralId];
92	$item = \compact('ids', 'translated');
93	if (!empty($item['ids']['singular'])) {
94	$id = $item['ids']['singular'];
95	if (isset($item['ids']['plural'])) {
96	$id .= '\|' . $item['ids']['plural'];
97	}
98	$messages[$id] = \stripcslashes(\implode('\|', (array) $item['translated']));
99	}
100	}
101	\fclose($stream);
102	return \array_filter($messages);
103	}
104	/**
105	* Reads an unsigned long from stream respecting endianness.
106	*
107	* @param resource $stream
108	*/
109	private function readLong($stream, bool $isBigEndian) : int
110	{
111	$result = \unpack($isBigEndian ? 'N1' : 'V1', \fread($stream, 4));
112	$result = \current($result);
113	return (int) \substr($result, -8);
114	}
115	}
116