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<?php
namespace Gettext\Extractors;
use Exception;
use Gettext\Translations;
use Gettext\Utils\StringReader;
/**
* Class to get gettext strings from .mo files.
*/
class Mo extends Extractor implements ExtractorInterface
{
const MAGIC1 = -1794895138;
const MAGIC2 = -569244523;
const MAGIC3 = 2500072158;
/**
* {@inheritdoc}
*/
public static function fromString($string, Translations $translations, array $options = [])
{
$stream = new StringReader($string);
$magic = self::readInt($stream, 'V');
if (($magic === self::MAGIC1) || ($magic === self::MAGIC3)) { //to make sure it works for 64-bit platforms
$byteOrder = 'V'; //low endian
} elseif ($magic === (self::MAGIC2 & 0xFFFFFFFF)) {
$byteOrder = 'N'; //big endian
} else {
throw new Exception('Not MO file');
}
self::readInt($stream, $byteOrder);
$total = self::readInt($stream, $byteOrder); //total string count
$originals = self::readInt($stream, $byteOrder); //offset of original table
$tran = self::readInt($stream, $byteOrder); //offset of translation table
$stream->seekto($originals);
$table_originals = self::readIntArray($stream, $byteOrder, $total * 2);
$stream->seekto($tran);
$table_translations = self::readIntArray($stream, $byteOrder, $total * 2);
for ($i = 0; $i < $total; ++$i) {
$next = $i * 2;
$stream->seekto($table_originals[$next + 2]);
$original = $stream->read($table_originals[$next + 1]);
$stream->seekto($table_translations[$next + 2]);
$translated = $stream->read($table_translations[$next + 1]);
if ($original === '') {
// Headers
foreach (explode("\n", $translated) as $headerLine) {
if ($headerLine === '') {
continue;
}
$headerChunks = preg_split('/:\s*/', $headerLine, 2);
$translations->setHeader($headerChunks[0], isset($headerChunks[1]) ? $headerChunks[1] : '');
}
continue;
}
$chunks = explode("\x04", $original, 2);
if (isset($chunks[1])) {
$context = $chunks[0];
$original = $chunks[1];
} else {
$context = '';
}
$chunks = explode("\x00", $original, 2);
if (isset($chunks[1])) {
$original = $chunks[0];
$plural = $chunks[1];
} else {
$plural = '';
}
$translation = $translations->insert($context, $original, $plural);
if ($translated === '') {
continue;
}
if ($plural === '') {
$translation->setTranslation($translated);
continue;
}
$v = explode("\x00", $translated);
$translation->setTranslation(array_shift($v));
$translation->setPluralTranslations($v);
}
}
/**
* @param StringReader $stream
* @param string $byteOrder
*/
private static function readInt(StringReader $stream, $byteOrder)
{
if (($read = $stream->read(4)) === false) {
return false;
}
$read = unpack($byteOrder, $read);
return array_shift($read);
}
/**
* @param StringReader $stream
* @param string $byteOrder
* @param int $count
*/
private static function readIntArray(StringReader $stream, $byteOrder, $count)
{
return unpack($byteOrder.$count, $stream->read(4 * $count));
}
}
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