includes/AjaxFunctions.php

   1 <?php
   2 /**
   3  * Handler functions for Ajax requests
   4  *
   5  * @file
   6  * @ingroup Ajax
   7  */
   8
   9 if ( !defined( 'MEDIAWIKI' ) ) {
  10         die( 1 );
  11 }
  12
  13 /**
  14  * Function converts an Javascript escaped string back into a string with
  15  * specified charset (default is UTF-8).
  16  * Modified function from http://pure-essence.net/stuff/code/utf8RawUrlDecode.phps
  17  *
  18  * @param $source String escaped with Javascript's escape() function
  19  * @param $iconv_to String destination character set will be used as second parameter
  20  * in the iconv function. Default is UTF-8.
  21  * @return string
  22  */
  23 function js_unescape( $source, $iconv_to = 'UTF-8' ) {
  24         $decodedStr = '';
  25         $pos = 0;
  26         $len = strlen ( $source );
  27
  28         while ( $pos < $len ) {
  29                 $charAt = substr ( $source, $pos, 1 );
  30                 if ( $charAt == '%' ) {
  31                         $pos++;
  32                         $charAt = substr ( $source, $pos, 1 );
  33
  34                         if ( $charAt == 'u' ) {
  35                                 // we got a unicode character
  36                                 $pos++;
  37                                 $unicodeHexVal = substr ( $source, $pos, 4 );
  38                                 $unicode = hexdec ( $unicodeHexVal );
  39                                 $decodedStr .= code2utf( $unicode );
  40                                 $pos += 4;
  41                         } else {
  42                                 // we have an escaped ascii character
  43                                 $hexVal = substr ( $source, $pos, 2 );
  44                                 $decodedStr .= chr ( hexdec ( $hexVal ) );
  45                                 $pos += 2;
  46                         }
  47                 } else {
  48                         $decodedStr .= $charAt;
  49                         $pos++;
  50                 }
  51         }
  52
  53         if ( $iconv_to != "UTF-8" ) {
  54                 $decodedStr = iconv( "utf-8", $iconv_to, $decodedStr );
  55         }
  56
  57         return $decodedStr;
  58 }
  59
  60 /**
  61  * Function coverts number of utf char into that character.
  62  * Function taken from: http://www.php.net/manual/en/function.utf8-encode.php#49336
  63  *
  64  * @param $num Integer
  65  * @return utf8char
  66  */
  67 function code2utf( $num ) {
  68         if ( $num < 128 ) {
  69                 return chr( $num );
  70         }
  71
  72         if ( $num < 2048 ) {
  73                 return chr( ( $num >> 6 ) + 192 ) . chr( ( $num&63 ) + 128 );
  74         }
  75
  76         if ( $num < 65536 ) {
  77                 return chr( ( $num >> 12 ) + 224 ) . chr( ( ( $num >> 6 )&63 ) + 128 ) . chr( ( $num&63 ) + 128 );
  78         }
  79
  80         if ( $num < 2097152 ) {
  81                 return chr( ( $num >> 18 ) + 240 ) . chr( ( ( $num >> 12 )&63 ) + 128 ) . chr( ( ( $num >> 6 )&63 ) + 128 ) . chr( ( $num&63 ) + 128 );
  82         }
  83
  84         return '';
  85 }
  86
  87 /**
  88  * Called in some places (currently just extensions)
  89  * to get the URL for a given file.
  90  */
  91 function wfAjaxGetFileUrl( $file ) {
  92         $file = wfFindFile( $file );
  93
  94         if ( !$file || !$file->exists() ) {
  95                 return null;
  96         }
  97
  98         $url = $file->getUrl();
  99
 100         return $url;
 101 }