<?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\Dumper;
 
 use Symfony\Component\Translation\MessageCatalogue;
 
 /**
  * IcuResDumper generates an ICU ResourceBundle formatted string representation of a message catalogue.
  *
  * @author Stealth35
  */
 class IcuResFileDumper extends FileDumper
 {
     /**
      * {@inheritdoc}
      */
     protected $relativePathTemplate = '%domain%/%locale%.%extension%';
 
     /**
      * {@inheritdoc}
      */
     public function formatCatalogue(MessageCatalogue $messages, $domain, array $options = [])
     {
         $data = $indexes = $resources = '';
 
         foreach ($messages->all($domain) as $source => $target) {
             $indexes .= pack('v', \strlen($data) + 28);
             $data .= $source."\0";
         }
 
         $data .= $this->writePadding($data);
 
         $keyTop = $this->getPosition($data);
 
         foreach ($messages->all($domain) as $source => $target) {
             $resources .= pack('V', $this->getPosition($data));
 
             $data .= pack('V', \strlen($target))
                 .mb_convert_encoding($target."\0", 'UTF-16LE', 'UTF-8')
                 .$this->writePadding($data)
                   ;
         }
 
         $resOffset = $this->getPosition($data);
 
         $data .= pack('v', \count($messages->all($domain)))
             .$indexes
             .$this->writePadding($data)
             .$resources
               ;
 
         $bundleTop = $this->getPosition($data);
 
         $root = pack('V7',
             $resOffset + (2 << 28), // Resource Offset + Resource Type
             6,                      // Index length
             $keyTop,                        // Index keys top
             $bundleTop,                     // Index resources top
             $bundleTop,                     // Index bundle top
             \count($messages->all($domain)), // Index max table length
             0                               // Index attributes
         );
 
         $header = pack('vC2v4C12@32',
             32,                     // Header size
             0xDA, 0x27,             // Magic number 1 and 2
             20, 0, 0, 2,            // Rest of the header, ..., Size of a char
             0x52, 0x65, 0x73, 0x42, // Data format identifier
             1, 2, 0, 0,             // Data version
             1, 4, 0, 0              // Unicode version
         );
 
         return $header.$root.$data;
     }
 
     private function writePadding($data)
     {
         $padding = \strlen($data) % 4;
 
         if ($padding) {
             return str_repeat("\xAA", 4 - $padding);
         }
     }
 
     private function getPosition($data)
     {
         return (\strlen($data) + 28) / 4;
     }
 
     /**
      * {@inheritdoc}
      */
     protected function getExtension()
     {
         return 'res';
     }
 }