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<?php
/**
* Class for working with MO files
*
* @version $Id: mo.php 1157 2015-11-20 04:30:11Z dd32 $
* @package pomo
* @subpackage mo
*/
require_once __DIR__ . '/translations.php';
require_once __DIR__ . '/streams.php';
if ( ! class_exists( 'MO', false ) ) :
class MO extends Gettext_Translations {
/**
* Number of plural forms.
*
* @var int
*/
public $_nplurals = 2;
/**
* Loaded MO file.
*
* @var string
*/
private $filename = '';
/**
* Returns the loaded MO file.
*
* @return string The loaded MO file.
*/
public function get_filename() {
return $this->filename;
}
/**
* Fills up with the entries from MO file $filename
*
* @param string $filename MO file to load
* @return bool True if the import from file was successful, otherwise false.
*/
public function import_from_file( $filename ) {
$reader = new POMO_FileReader( $filename );
if ( ! $reader->is_resource() ) {
return false;
}
$this->filename = (string) $filename;
return $this->import_from_reader( $reader );
}
/**
* @param string $filename
* @return bool
*/
public function export_to_file( $filename ) {
$fh = fopen( $filename, 'wb' );
if ( ! $fh ) {
return false;
}
$res = $this->export_to_file_handle( $fh );
fclose( $fh );
return $res;
}
/**
* @return string|false
*/
public function export() {
$tmp_fh = fopen( 'php://temp', 'r+' );
if ( ! $tmp_fh ) {
return false;
}
$this->export_to_file_handle( $tmp_fh );
rewind( $tmp_fh );
return stream_get_contents( $tmp_fh );
}
/**
* @param Translation_Entry $entry
* @return bool
*/
public function is_entry_good_for_export( $entry ) {
if ( empty( $entry->translations ) ) {
return false;
}
if ( ! array_filter( $entry->translations ) ) {
return false;
}
return true;
}
/**
* @param resource $fh
* @return true
*/
public function export_to_file_handle( $fh ) {
$entries = array_filter( $this->entries, array( $this, 'is_entry_good_for_export' ) );
ksort( $entries );
$magic = 0x950412de;
$revision = 0;
$total = count( $entries ) + 1; // All the headers are one entry.
$originals_lengths_addr = 28;
$translations_lengths_addr = $originals_lengths_addr + 8 * $total;
$size_of_hash = 0;
$hash_addr = $translations_lengths_addr + 8 * $total;
$current_addr = $hash_addr;
fwrite(
$fh,
pack(
'V*',
$magic,
$revision,
$total,
$originals_lengths_addr,
$translations_lengths_addr,
$size_of_hash,
$hash_addr
)
);
fseek( $fh, $originals_lengths_addr );
// Headers' msgid is an empty string.
fwrite( $fh, pack( 'VV', 0, $current_addr ) );
++$current_addr;
$originals_table = "\0";
$reader = new POMO_Reader();
foreach ( $entries as $entry ) {
$originals_table .= $this->export_original( $entry ) . "\0";
$length = $reader->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', $reader->strlen( $exported_headers ), $current_addr ) );
$current_addr += strlen( $exported_headers ) + 1;
$translations_table = $exported_headers . "\0";
foreach ( $entries as $entry ) {
$translations_table .= $this->export_translations( $entry ) . "\0";
$length = $reader->strlen( $this->export_translations( $entry ) );
fwrite( $fh, pack( 'VV', $length, $current_addr ) );
$current_addr += $length + 1;
}
fwrite( $fh, $originals_table );
fwrite( $fh, $translations_table );
return true;
}
/**
* @param Translation_Entry $entry
* @return string
*/
public function export_original( $entry ) {
// TODO: Warnings for control characters.
$exported = $entry->singular;
if ( $entry->is_plural ) {
$exported .= "\0" . $entry->plural;
}
if ( $entry->context ) {
$exported = $entry->context . "\4" . $exported;
}
return $exported;
}
/**
* @param Translation_Entry $entry
* @return string
*/
public function export_translations( $entry ) {
// TODO: Warnings for control characters.
return $entry->is_plural ? implode( "\0", $entry->translations ) : $entry->translations[0];
}
/**
* @return string
*/
public function export_headers() {
$exported = '';
foreach ( $this->headers as $header => $value ) {
$exported .= "$header: $value\n";
}
return $exported;
}
/**
* @param int $magic
* @return string|false
*/
public 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';
} elseif ( $magic_big === $magic ) {
return 'big';
} else {
return false;
}
}
/**
* @param POMO_FileReader $reader
* @return bool True if the import was successful, otherwise false.
*/
public 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_lengths_addr/{$endian}translations_lengths_addr/{$endian}hash_length/{$endian}hash_addr", $header );
if ( ! is_array( $header ) ) {
return false;
}
// Support revision 0 of MO format specs, only.
if ( 0 !== $header['revision'] ) {
return false;
}
// Seek to data blocks.
$reader->seekto( $header['originals_lengths_addr'] );
// Read originals' indices.
$originals_lengths_length = $header['translations_lengths_addr'] - $header['originals_lengths_addr'];
if ( $originals_lengths_length !== $header['total'] * 8 ) {
return false;
}
$originals = $reader->read( $originals_lengths_length );
if ( $reader->strlen( $originals ) !== $originals_lengths_length ) {
return false;
}
// Read translations' indices.
$translations_lengths_length = $header['hash_addr'] - $header['translations_lengths_addr'];
if ( $translations_lengths_length !== $header['total'] * 8 ) {
return false;
}
$translations = $reader->read( $translations_lengths_length );
if ( $reader->strlen( $translations ) !== $translations_lengths_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 = $header['hash_addr'] + $header['hash_length'] * 4;
$reader->seekto( $strings_addr );
$strings = $reader->read_all();
$reader->close();
for ( $i = 0; $i < $header['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
* @return Translation_Entry Entry instance.
*/
public function &make_entry( $original, $translation ) {
$entry = new Translation_Entry();
// Look for context, separated by \4.
$parts = explode( "\4", $original );
if ( isset( $parts[1] ) ) {
$original = $parts[1];
$entry->context = $parts[0];
}
// Look for plural original.
$parts = explode( "\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( "\0", $translation );
return $entry;
}
/**
* @param int $count
* @return string
*/
public function select_plural_form( $count ) {
return $this->gettext_select_plural_form( $count );
}
/**
* @return int
*/
public function get_plural_forms_count() {
return $this->_nplurals;
}
}
endif;