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1 <?php
2 /**
3  * Class for working with MO files
4  *
5  * @version $Id: mo.php 406 2010-02-07 11:10:24Z nbachiyski $
6  * @package pomo
7  * @subpackage mo
8  */
9
10 require_once dirname(__FILE__) . '/translations.php';
11 require_once dirname(__FILE__) . '/streams.php';
12
13 if ( !class_exists( 'MO' ) ):
14 class MO extends Gettext_Translations {
15
16         var $_nplurals = 2;
17
18         /**
19          * Fills up with the entries from MO file $filename
20          *
21          * @param string $filename MO file to load
22          */
23         function import_from_file($filename) {
24                 $reader = new POMO_FileReader($filename);
25                 if (!$reader->is_resource())
26                         return false;
27                 return $this->import_from_reader($reader);
28         }
29
30         function export_to_file($filename) {
31                 $fh = fopen($filename, 'wb');
32                 if ( !$fh ) return false;
33                 $entries = array_filter($this->entries, create_function('$e', 'return !empty($e->translations);'));
34                 ksort($entries);
35                 $magic = 0x950412de;
36                 $revision = 0;
37                 $total = count($entries) + 1; // all the headers are one entry
38                 $originals_lenghts_addr = 28;
39                 $translations_lenghts_addr = $originals_lenghts_addr + 8 * $total;
40                 $size_of_hash = 0;
41                 $hash_addr = $translations_lenghts_addr + 8 * $total;
42                 $current_addr = $hash_addr;
43                 fwrite($fh, pack('V*', $magic, $revision, $total, $originals_lenghts_addr,
44                         $translations_lenghts_addr, $size_of_hash, $hash_addr));
45                 fseek($fh, $originals_lenghts_addr);
46
47                 // headers' msgid is an empty string
48                 fwrite($fh, pack('VV', 0, $current_addr));
49                 $current_addr++;
50                 $originals_table = chr(0);
51
52                 foreach($entries as $entry) {
53                         $originals_table .= $this->export_original($entry) . chr(0);
54                         $length = strlen($this->export_original($entry));
55                         fwrite($fh, pack('VV', $length, $current_addr));
56                         $current_addr += $length + 1; // account for the NULL byte after
57                 }
58
59                 $exported_headers = $this->export_headers();
60                 fwrite($fh, pack('VV', strlen($exported_headers), $current_addr));
61                 $current_addr += strlen($exported_headers) + 1;
62                 $translations_table = $exported_headers . chr(0);
63
64                 foreach($entries as $entry) {
65                         $translations_table .= $this->export_translations($entry) . chr(0);
66                         $length = strlen($this->export_translations($entry));
67                         fwrite($fh, pack('VV', $length, $current_addr));
68                         $current_addr += $length + 1;
69                 }
70
71                 fwrite($fh, $originals_table);
72                 fwrite($fh, $translations_table);
73                 fclose($fh);
74         }
75
76         function export_original($entry) {
77                 //TODO: warnings for control characters
78                 $exported = $entry->singular;
79                 if ($entry->is_plural) $exported .= chr(0).$entry->plural;
80                 if (!is_null($entry->context)) $exported = $entry->context . chr(4) . $exported;
81                 return $exported;
82         }
83
84         function export_translations($entry) {
85                 //TODO: warnings for control characters
86                 return implode(chr(0), $entry->translations);
87         }
88
89         function export_headers() {
90                 $exported = '';
91                 foreach($this->headers as $header => $value) {
92                         $exported.= "$header: $value\n";
93                 }
94                 return $exported;
95         }
96
97         function get_byteorder($magic) {
98                 // The magic is 0x950412de
99
100                 // bug in PHP 5.0.2, see https://savannah.nongnu.org/bugs/?func=detailitem&item_id=10565
101                 $magic_little = (int) - 1794895138;
102                 $magic_little_64 = (int) 2500072158;
103                 // 0xde120495
104                 $magic_big = ((int) - 569244523) & 0xFFFFFFFF;
105                 if ($magic_little == $magic || $magic_little_64 == $magic) {
106                         return 'little';
107                 } else if ($magic_big == $magic) {
108                         return 'big';
109                 } else {
110                         return false;
111                 }
112         }
113
114         function import_from_reader($reader) {
115                 $endian_string = MO::get_byteorder($reader->readint32());
116                 if (false === $endian_string) {
117                         return false;
118                 }
119                 $reader->setEndian($endian_string);
120
121                 $endian = ('big' == $endian_string)? 'N' : 'V';
122
123                 $header = $reader->read(24);
124                 if ($reader->strlen($header) != 24)
125                         return false;
126
127                 // parse header
128                 $header = unpack("{$endian}revision/{$endian}total/{$endian}originals_lenghts_addr/{$endian}translations_lenghts_addr/{$endian}hash_length/{$endian}hash_addr", $header);
129                 if (!is_array($header))
130                         return false;
131
132                 extract( $header );
133
134                 // support revision 0 of MO format specs, only
135                 if ($revision != 0)
136                         return false;
137
138                 // seek to data blocks
139                 $reader->seekto($originals_lenghts_addr);
140
141                 // read originals' indices
142                 $originals_lengths_length = $translations_lenghts_addr - $originals_lenghts_addr;
143                 if ( $originals_lengths_length != $total * 8 )
144                         return false;
145
146                 $originals = $reader->read($originals_lengths_length);
147                 if ( $reader->strlen( $originals ) != $originals_lengths_length )
148                         return false;
149
150                 // read translations' indices
151                 $translations_lenghts_length = $hash_addr - $translations_lenghts_addr;
152                 if ( $translations_lenghts_length != $total * 8 )
153                         return false;
154
155                 $translations = $reader->read($translations_lenghts_length);
156                 if ( $reader->strlen( $translations ) != $translations_lenghts_length )
157                         return false;
158
159                 // transform raw data into set of indices
160                 $originals    = $reader->str_split( $originals, 8 );
161                 $translations = $reader->str_split( $translations, 8 );
162
163                 // skip hash table
164                 $strings_addr = $hash_addr + $hash_length * 4;
165
166                 $reader->seekto($strings_addr);
167
168                 $strings = $reader->read_all();
169                 $reader->close();
170
171                 for ( $i = 0; $i < $total; $i++ ) {
172                         $o = unpack( "{$endian}length/{$endian}pos", $originals[$i] );
173                         $t = unpack( "{$endian}length/{$endian}pos", $translations[$i] );
174                         if ( !$o || !$t ) return false;
175
176                         // adjust offset due to reading strings to separate space before
177                         $o['pos'] -= $strings_addr;
178                         $t['pos'] -= $strings_addr;
179
180                         $original    = $reader->substr( $strings, $o['pos'], $o['length'] );
181                         $translation = $reader->substr( $strings, $t['pos'], $t['length'] );
182
183                         if ('' === $original) {
184                                 $this->set_headers($this->make_headers($translation));
185                         } else {
186                                 $entry = &$this->make_entry($original, $translation);
187                                 $this->entries[$entry->key()] = &$entry;
188                         }
189                 }
190                 return true;
191         }
192
193         /**
194          * Build a Translation_Entry from original string and translation strings,
195          * found in a MO file
196          *
197          * @static
198          * @param string $original original string to translate from MO file. Might contain
199          *      0x04 as context separator or 0x00 as singular/plural separator
200          * @param string $translation translation string from MO file. Might contain
201          *      0x00 as a plural translations separator
202          */
203         function &make_entry($original, $translation) {
204                 $entry = new Translation_Entry();
205                 // look for context
206                 $parts = explode(chr(4), $original);
207                 if (isset($parts[1])) {
208                         $original = $parts[1];
209                         $entry->context = $parts[0];
210                 }
211                 // look for plural original
212                 $parts = explode(chr(0), $original);
213                 $entry->singular = $parts[0];
214                 if (isset($parts[1])) {
215                         $entry->is_plural = true;
216                         $entry->plural = $parts[1];
217                 }
218                 // plural translations are also separated by \0
219                 $entry->translations = explode(chr(0), $translation);
220                 return $entry;
221         }
222
223         function select_plural_form($count) {
224                 return $this->gettext_select_plural_form($count);
225         }
226
227         function get_plural_forms_count() {
228                 return $this->_nplurals;
229         }
230 }
231 endif;