<?php

/**

* Class for working with MO files

*

* @version $Id: mo.php 406 2010-02-07 11:10:24Z nbachiyski $

* @package pomo

* @subpackage mo

*/

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

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

if ( !class_exists( 'MO' ) ):

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) {

$reader = new POMO_FileReader($filename);

if (!$reader->is_resource())

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) {

$endian_string = MO::get_byteorder($reader->readint32());

if (false === $endian_string) {

return false;

}

$reader->setEndian($endian_string);

$endian = ('big' == $endian_string)? 'N' : 'V';

$header = $reader->read(24);

if ($reader->strlen($header) != 24)

return false;

// parse header

$header = unpack("{$endian}revision/{$endian}total/{$endian}originals_lenghts_addr/{$endian}translations_lenghts_addr/{$endian}hash_length/{$endian}hash_addr", $header);

if (!is_array($header))

return false;

extract( $header );

// support revision 0 of MO format specs, only

if ($revision != 0)

return false;

// seek to data blocks

$reader->seekto($originals_lenghts_addr);

// read originals' indices

$originals_lengths_length = $translations_lenghts_addr - $originals_lenghts_addr;

if ( $originals_lengths_length != $total * 8 )

return false;

$originals = $reader->read($originals_lengths_length);

if ( $reader->strlen( $originals ) != $originals_lengths_length )

return false;

// read translations' indices

$translations_lenghts_length = $hash_addr - $translations_lenghts_addr;

if ( $translations_lenghts_length != $total * 8 )

return false;

$translations = $reader->read($translations_lenghts_length);

if ( $reader->strlen( $translations ) != $translations_lenghts_length )

return false;

// transform raw data into set of indices

$originals = $reader->str_split( $originals, 8 );

$translations = $reader->str_split( $translations, 8 );

// skip hash table

$strings_addr = $hash_addr + $hash_length * 4;

$reader->seekto($strings_addr);

$strings = $reader->read_all();

$reader->close();

for ( $i = 0; $i < $total; $i++ ) {

$o = unpack( "{$endian}length/{$endian}pos", $originals[$i] );

$t = unpack( "{$endian}length/{$endian}pos", $translations[$i] );

if ( !$o || !$t ) return false;

// adjust offset due to reading strings to separate space before

$o['pos'] -= $strings_addr;

$t['pos'] -= $strings_addr;

$original = $reader->substr( $strings, $o['pos'], $o['length'] );

$translation = $reader->substr( $strings, $t['pos'], $t['length'] );

if ('' === $original) {

$this->set_headers($this->make_headers($translation));

} else {

$entry = &$this->make_entry($original, $translation);

$this->entries[$entry->key()] = &$entry;

}

}

return true;

}

/**

* Build a Translation_Entry from original string and translation strings,

* found in a MO file

*

* @static

* @param string $original original string to translate from MO file. Might contain

* 0x04 as context separator or 0x00 as singular/plural separator

* @param string $translation translation string from MO file. Might contain

* 0x00 as a plural translations separator

*/

function &make_entry($original, $translation) {

$entry = new Translation_Entry();

// look for context

$parts = explode(chr(4), $original);

if (isset($parts[1])) {

$original = $parts[1];

$entry->context = $parts[0];

}

// look for plural original

$parts = explode(chr(0), $original);

$entry->singular = $parts[0];

if (isset($parts[1])) {

$entry->is_plural = true;

$entry->plural = $parts[1];

}

// plural translations are also separated by \0

$entry->translations = explode(chr(0), $translation);

return $entry;

}

function select_plural_form($count) {

return $this->gettext_select_plural_form($count);

}

function get_plural_forms_count() {

return $this->_nplurals;

}

}

endif;