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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\I18n\Translator\Loader;
use Zend\I18n\Exception;
use Zend\I18n\Translator\Plural\Rule as PluralRule;
use Zend\I18n\Translator\TextDomain;
use Zend\Stdlib\ErrorHandler;
/**
* Gettext loader.
*/
class Gettext extends AbstractFileLoader
{
/**
* Current file pointer.
*
* @var resource
*/
protected $file;
/**
* Whether the current file is little endian.
*
* @var bool
*/
protected $littleEndian;
/**
* load(): defined by FileLoaderInterface.
*
* @see FileLoaderInterface::load()
* @param string $locale
* @param string $filename
* @return TextDomain
* @throws Exception\InvalidArgumentException
*/
public function load($locale, $filename)
{
$resolvedFile = $this->resolveFile($filename);
if (!$resolvedFile) {
throw new Exception\InvalidArgumentException(sprintf(
'Could not find or open file %s for reading',
$filename
));
}
$textDomain = new TextDomain();
ErrorHandler::start();
$this->file = fopen($resolvedFile, 'rb');
$error = ErrorHandler::stop();
if (false === $this->file) {
throw new Exception\InvalidArgumentException(sprintf(
'Could not open file %s for reading',
$filename
), 0, $error);
}
// Verify magic number
$magic = fread($this->file, 4);
if ($magic == "\x95\x04\x12\xde") {
$this->littleEndian = false;
} elseif ($magic == "\xde\x12\x04\x95") {
$this->littleEndian = true;
} else {
fclose($this->file);
throw new Exception\InvalidArgumentException(sprintf(
'%s is not a valid gettext file',
$filename
));
}
// Verify major revision (only 0 and 1 supported)
$majorRevision = ($this->readInteger() >> 16);
if ($majorRevision !== 0 && $majorRevision !== 1) {
fclose($this->file);
throw new Exception\InvalidArgumentException(sprintf(
'%s has an unknown major revision',
$filename
));
}
// Gather main information
$numStrings = $this->readInteger();
$originalStringTableOffset = $this->readInteger();
$translationStringTableOffset = $this->readInteger();
// Usually there follow size and offset of the hash table, but we have
// no need for it, so we skip them.
fseek($this->file, $originalStringTableOffset);
$originalStringTable = $this->readIntegerList(2 * $numStrings);
fseek($this->file, $translationStringTableOffset);
$translationStringTable = $this->readIntegerList(2 * $numStrings);
// Read in all translations
for ($current = 0; $current < $numStrings; $current++) {
$sizeKey = $current * 2 + 1;
$offsetKey = $current * 2 + 2;
$originalStringSize = $originalStringTable[$sizeKey];
$originalStringOffset = $originalStringTable[$offsetKey];
$translationStringSize = $translationStringTable[$sizeKey];
$translationStringOffset = $translationStringTable[$offsetKey];
$originalString = array('');
if ($originalStringSize > 0) {
fseek($this->file, $originalStringOffset);
$originalString = explode("\0", fread($this->file, $originalStringSize));
}
if ($translationStringSize > 0) {
fseek($this->file, $translationStringOffset);
$translationString = explode("\0", fread($this->file, $translationStringSize));
if (count($originalString) > 1 && count($translationString) > 1) {
$textDomain[$originalString[0]] = $translationString;
array_shift($originalString);
foreach ($originalString as $string) {
if (! isset($textDomain[$string])) {
$textDomain[$string] = '';
}
}
} else {
$textDomain[$originalString[0]] = $translationString[0];
}
}
}
// Read header entries
if (array_key_exists('', $textDomain)) {
$rawHeaders = explode("\n", trim($textDomain['']));
foreach ($rawHeaders as $rawHeader) {
list($header, $content) = explode(':', $rawHeader, 2);
if (trim(strtolower($header)) === 'plural-forms') {
$textDomain->setPluralRule(PluralRule::fromString($content));
}
}
unset($textDomain['']);
}
fclose($this->file);
return $textDomain;
}
/**
* Read a single integer from the current file.
*
* @return int
*/
protected function readInteger()
{
if ($this->littleEndian) {
$result = unpack('Vint', fread($this->file, 4));
} else {
$result = unpack('Nint', fread($this->file, 4));
}
return $result['int'];
}
/**
* Read an integer from the current file.
*
* @param int $num
* @return int
*/
protected function readIntegerList($num)
{
if ($this->littleEndian) {
return unpack('V' . $num, fread($this->file, 4 * $num));
}
return unpack('N' . $num, fread($this->file, 4 * $num));
}
}
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