<?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;

	}

}

?>