source: trunk/www.guidonia.net/wp/wp-includes/pomo/mo.php@ 44

<?php
/**
 * Class for working with MO files
 *
 * @version $Id: mo.php 106 2009-04-23 19:48:22Z nbachiyski $
 * @package pomo
 * @subpackage mo
 */

require_once dirname(__FILE__) . '/translations.php';
require_once dirname(__FILE__) . '/streams.php';

class MO extends Gettext_Translations {

        var $_nplurals = 2;

        /**
         * Fills up with the entries from MO file $filename
         *
         * @param string $filename MO file to load
         */
        function import_from_file($filename) {
                $reader = new POMO_CachedIntFileReader($filename);
                if (isset($reader->error)) {
                        return false;
                }
                return $this->import_from_reader($reader);
        }
        
        function export_to_file($filename) {
                $fh = fopen($filename, 'wb');
                if ( !$fh ) return false;
                $entries = array_filter($this->entries, create_function('$e', 'return !empty($e->translations);'));
                ksort($entries);
                $magic = 0x950412de;
                $revision = 0;
                $total = count($entries) + 1; // all the headers are one entry
                $originals_lenghts_addr = 28;
                $translations_lenghts_addr = $originals_lenghts_addr + 8 * $total;
                $size_of_hash = 0;
                $hash_addr = $translations_lenghts_addr + 8 * $total;
                $current_addr = $hash_addr;
                fwrite($fh, pack('V*', $magic, $revision, $total, $originals_lenghts_addr,
                        $translations_lenghts_addr, $size_of_hash, $hash_addr));
                fseek($fh, $originals_lenghts_addr);
                
                // headers' msgid is an empty string
                fwrite($fh, pack('VV', 0, $current_addr));
                $current_addr++;
                $originals_table = chr(0);

                foreach($entries as $entry) {
                        $originals_table .= $this->export_original($entry) . chr(0);
                        $length = strlen($this->export_original($entry));
                        fwrite($fh, pack('VV', $length, $current_addr));
                        $current_addr += $length + 1; // account for the NULL byte after
                }
                
                $exported_headers = $this->export_headers();
                fwrite($fh, pack('VV', strlen($exported_headers), $current_addr));
                $current_addr += strlen($exported_headers) + 1;
                $translations_table = $exported_headers . chr(0);
                
                foreach($entries as $entry) {
                        $translations_table .= $this->export_translations($entry) . chr(0);
                        $length = strlen($this->export_translations($entry));
                        fwrite($fh, pack('VV', $length, $current_addr));
                        $current_addr += $length + 1;
                }
                
                fwrite($fh, $originals_table);
                fwrite($fh, $translations_table);
                fclose($fh);
        }
        
        function export_original($entry) {
                //TODO: warnings for control characters
                $exported = $entry->singular;
                if ($entry->is_plural) $exported .= chr(0).$entry->plural;
                if (!is_null($entry->context)) $exported = $entry->context . chr(4) . $exported;
                return $exported;
        }
        
        function export_translations($entry) {
                //TODO: warnings for control characters
                return implode(chr(0), $entry->translations);
        }
        
        function export_headers() {
                $exported = '';
                foreach($this->headers as $header => $value) {
                        $exported.= "$header: $value\n";
                }
                return $exported;
        }

        function get_byteorder($magic) {

                // The magic is 0x950412de

                // bug in PHP 5.0.2, see https://savannah.nongnu.org/bugs/?func=detailitem&item_id=10565
                $magic_little = (int) - 1794895138;
                $magic_little_64 = (int) 2500072158;
                // 0xde120495
                $magic_big = ((int) - 569244523) && 0xFFFFFFFF;
                
                if ($magic_little == $magic || $magic_little_64 == $magic) {
                        return 'little';
                } else if ($magic_big == $magic) {
                        return 'big';
                } else {
                        return false;
                }
        }

        function import_from_reader($reader) {
                $reader->setEndian('little');
                $endian = MO::get_byteorder($reader->readint32());
                if (false === $endian) {
                        return false;
                }
                $reader->setEndian($endian);

                $revision = $reader->readint32();
                $total = $reader->readint32();
                // get addresses of array of lenghts and offsets for original string and translations
                $originals_lenghts_addr = $reader->readint32();
                $translations_lenghts_addr = $reader->readint32();

                $reader->seekto($originals_lenghts_addr);
                $originals_lenghts = $reader->readint32array($total * 2); // each of 
                $reader->seekto($translations_lenghts_addr);
                $translations_lenghts = $reader->readint32array($total * 2);

                $length = create_function('$i', 'return $i * 2 + 1;');
                $offset = create_function('$i', 'return $i * 2 + 2;');

                for ($i = 0; $i < $total; ++$i) {
                        $reader->seekto($originals_lenghts[$offset($i)]);
                        $original = $reader->read($originals_lenghts[$length($i)]);
                        $reader->seekto($translations_lenghts[$offset($i)]);
                        $translation = $reader->read($translations_lenghts[$length($i)]);
                        if ('' == $original) {
                                $this->set_headers($this->make_headers($translation));
                        } else {
                                $this->add_entry($this->make_entry($original, $translation));
                        }
                }
                return true;
        }

        /**
         * @static
         */
        function &make_entry($original, $translation) {
                $args = array();
                // look for context
                $parts = explode(chr(4), $original);
                if (isset($parts[1])) {
                        $original = $parts[1];
                        $args['context'] = $parts[0];
                }
                // look for plural original
                $parts = explode(chr(0), $original);
                $args['singular'] = $parts[0];
                if (isset($parts[1])) {
                        $args['plural'] = $parts[1];
                }
                // plural translations are also separated by \0
                $args['translations'] = explode(chr(0), $translation);
                $entry = & new Translation_Entry($args);
                return $entry;
        }

        function select_plural_form($count) {
                return $this->gettext_select_plural_form($count);
        }

        function get_plural_forms_count() {
                return $this->_nplurals;
        }


}
?>