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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.
+     */
+    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);
+    }
+}