<?php 
/**
 * @author   "Sebastián Grignoli" <grignoli@framework2.com.ar>
 * @package  Encoding
 * @version  1.1
 * @link     http://www.framework2.com.ar/dzone/forceUTF8-es/
 * @example  http://www.framework2.com.ar/dzone/forceUTF8-es/
  */

class Encoding {
    
  protected static $win1252ToUtf8 = array(
        128 => "\xe2\x82\xac",

        130 => "\xe2\x80\x9a",
        131 => "\xc6\x92",
        132 => "\xe2\x80\x9e",
        133 => "\xe2\x80\xa6",
        134 => "\xe2\x80\xa0",
        135 => "\xe2\x80\xa1",
        136 => "\xcb\x86",
        137 => "\xe2\x80\xb0",
        138 => "\xc5\xa0",
        139 => "\xe2\x80\xb9",
        140 => "\xc5\x92",

        142 => "\xc5\xbd",


        145 => "\xe2\x80\x98",
        146 => "\xe2\x80\x99",
        147 => "\xe2\x80\x9c",
        148 => "\xe2\x80\x9d",
        149 => "\xe2\x80\xa2",
        150 => "\xe2\x80\x93",
        151 => "\xe2\x80\x94",
        152 => "\xcb\x9c",
        153 => "\xe2\x84\xa2",
        154 => "\xc5\xa1",
        155 => "\xe2\x80\xba",
        156 => "\xc5\x93",

        158 => "\xc5\xbe",
        159 => "\xc5\xb8"
  );
  
    protected static $brokenUtf8ToUtf8 = array(
        "\xc2\x80" => "\xe2\x82\xac",
        
        "\xc2\x82" => "\xe2\x80\x9a",
        "\xc2\x83" => "\xc6\x92",
        "\xc2\x84" => "\xe2\x80\x9e",
        "\xc2\x85" => "\xe2\x80\xa6",
        "\xc2\x86" => "\xe2\x80\xa0",
        "\xc2\x87" => "\xe2\x80\xa1",
        "\xc2\x88" => "\xcb\x86",
        "\xc2\x89" => "\xe2\x80\xb0",
        "\xc2\x8a" => "\xc5\xa0",
        "\xc2\x8b" => "\xe2\x80\xb9",
        "\xc2\x8c" => "\xc5\x92",
        
        "\xc2\x8e" => "\xc5\xbd",
        
        
        "\xc2\x91" => "\xe2\x80\x98",
        "\xc2\x92" => "\xe2\x80\x99",
        "\xc2\x93" => "\xe2\x80\x9c",
        "\xc2\x94" => "\xe2\x80\x9d",
        "\xc2\x95" => "\xe2\x80\xa2",
        "\xc2\x96" => "\xe2\x80\x93",
        "\xc2\x97" => "\xe2\x80\x94",
        "\xc2\x98" => "\xcb\x9c",
        "\xc2\x99" => "\xe2\x84\xa2",
        "\xc2\x9a" => "\xc5\xa1",
        "\xc2\x9b" => "\xe2\x80\xba",
        "\xc2\x9c" => "\xc5\x93",
        
        "\xc2\x9e" => "\xc5\xbe",
        "\xc2\x9f" => "\xc5\xb8"
  );
    
  protected static $utf8ToWin1252 = array(
       "\xe2\x82\xac" => "\x80",
       
       "\xe2\x80\x9a" => "\x82",
       "\xc6\x92"     => "\x83",
       "\xe2\x80\x9e" => "\x84",
       "\xe2\x80\xa6" => "\x85",
       "\xe2\x80\xa0" => "\x86",
       "\xe2\x80\xa1" => "\x87",
       "\xcb\x86"     => "\x88",
       "\xe2\x80\xb0" => "\x89",
       "\xc5\xa0"     => "\x8a",
       "\xe2\x80\xb9" => "\x8b",
       "\xc5\x92"     => "\x8c",
       
       "\xc5\xbd"     => "\x8e",
       
       
       "\xe2\x80\x98" => "\x91",
       "\xe2\x80\x99" => "\x92",
       "\xe2\x80\x9c" => "\x93",
       "\xe2\x80\x9d" => "\x94",
       "\xe2\x80\xa2" => "\x95",
       "\xe2\x80\x93" => "\x96",
       "\xe2\x80\x94" => "\x97",
       "\xcb\x9c"     => "\x98",
       "\xe2\x84\xa2" => "\x99",
       "\xc5\xa1"     => "\x9a",
       "\xe2\x80\xba" => "\x9b",
       "\xc5\x93"     => "\x9c",
       
       "\xc5\xbe"     => "\x9e",
       "\xc5\xb8"     => "\x9f"
    );

  static function toUTF8($text){
  /**
   * Function Encoding::toUTF8
   *
   * This function leaves UTF8 characters alone, while converting almost all non-UTF8 to UTF8.
   * 
   * It assumes that the encoding of the original string is either Windows-1252 or ISO 8859-1.
   *
   * It may fail to convert characters to UTF-8 if they fall into one of these scenarios:
   *
   * 1) when any of these characters:   ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞß
   *    are followed by any of these:  ("group B")
   *                                    ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶•¸¹º»¼½¾¿
   * For example:   %ABREPRESENT%C9%BB. «REPRESENTÉ»
   * The "«" (%AB) character will be converted, but the "É" followed by "»" (%C9%BB) 
   * is also a valid unicode character, and will be left unchanged.
   *
   * 2) when any of these: àáâãäåæçèéêëìíîï  are followed by TWO chars from group B,
   * 3) when any of these: ðñòó  are followed by THREE chars from group B.
   *
   * @name toUTF8
   * @param string $text  Any string.
   * @return string  The same string, UTF8 encoded
   *
   */

    if(is_array($text))
    {
      foreach($text as $k => $v)
      {
        $text[$k] = self::toUTF8($v);
      }
      return $text;
    } elseif(is_string($text)) {
    
      $max = strlen($text);
      $buf = "";
      for($i = 0; $i < $max; $i++){
          $c1 = $text{$i};
          if($c1>="\xc0"){ //Should be converted to UTF8, if it's not UTF8 already
            $c2 = $i+1 >= $max? "\x00" : $text{$i+1};
            $c3 = $i+2 >= $max? "\x00" : $text{$i+2};
            $c4 = $i+3 >= $max? "\x00" : $text{$i+3};
              if($c1 >= "\xc0" & $c1 <= "\xdf"){ //looks like 2 bytes UTF8
                  if($c2 >= "\x80" && $c2 <= "\xbf"){ //yeah, almost sure it's UTF8 already
                      $buf .= $c1 . $c2;
                      $i++;
                  } else { //not valid UTF8.  Convert it.
                      $cc1 = (chr(ord($c1) / 64) | "\xc0");
                      $cc2 = ($c1 & "\x3f") | "\x80";
                      $buf .= $cc1 . $cc2;
                  }
              } elseif($c1 >= "\xe0" & $c1 <= "\xef"){ //looks like 3 bytes UTF8
                  if($c2 >= "\x80" && $c2 <= "\xbf" && $c3 >= "\x80" && $c3 <= "\xbf"){ //yeah, almost sure it's UTF8 already
                      $buf .= $c1 . $c2 . $c3;
                      $i = $i + 2;
                  } else { //not valid UTF8.  Convert it.
                      $cc1 = (chr(ord($c1) / 64) | "\xc0");
                      $cc2 = ($c1 & "\x3f") | "\x80";
                      $buf .= $cc1 . $cc2;
                  }
              } elseif($c1 >= "\xf0" & $c1 <= "\xf7"){ //looks like 4 bytes UTF8
                  if($c2 >= "\x80" && $c2 <= "\xbf" && $c3 >= "\x80" && $c3 <= "\xbf" && $c4 >= "\x80" && $c4 <= "\xbf"){ //yeah, almost sure it's UTF8 already
                      $buf .= $c1 . $c2 . $c3;
                      $i = $i + 2;
                  } else { //not valid UTF8.  Convert it.
                      $cc1 = (chr(ord($c1) / 64) | "\xc0");
                      $cc2 = ($c1 & "\x3f") | "\x80";
                      $buf .= $cc1 . $cc2;
                  }
              } else { //doesn't look like UTF8, but should be converted
                      $cc1 = (chr(ord($c1) / 64) | "\xc0");
                      $cc2 = (($c1 & "\x3f") | "\x80");
                      $buf .= $cc1 . $cc2;
              }
          } elseif(($c1 & "\xc0") == "\x80"){ // needs conversion
                if(isset(self::$win1252ToUtf8[ord($c1)])) { //found in Windows-1252 special cases
                    $buf .= self::$win1252ToUtf8[ord($c1)];
                } else {
                  $cc1 = (chr(ord($c1) / 64) | "\xc0");
                  $cc2 = (($c1 & "\x3f") | "\x80");
                  $buf .= $cc1 . $cc2;
                }
          } else { // it doesn't need convesion
              $buf .= $c1;
          }
      }
      return $buf;
    } else {
      return $text;
    }
  }

  static function toWin1252($text) {
    if(is_array($text)) {
      foreach($text as $k => $v) {
        $text[$k] = self::toWin1252($v);
      }
      return $text;
    } elseif(is_string($text)) {
      return utf8_decode(str_replace(array_keys(self::$utf8ToWin1252), array_values(self::$utf8ToWin1252), self::toUTF8($text)));
    } else {
      return $text;
    }
  }

  static function toISO8859($text) {
    return self::toWin1252($text);
  }

  static function toLatin1($text) {
    return self::toWin1252($text);
  }

  static function fixUTF8($text){
    if(is_array($text)) {
      foreach($text as $k => $v) {
        $text[$k] = self::fixUTF8($v);
      }
      return $text;
    }

    $last = "";
    while($last <> $text){
      $last = $text;
      $text = self::toUTF8(utf8_decode(str_replace(array_keys(self::$utf8ToWin1252), array_values(self::$utf8ToWin1252), $text)));
    }
    $text = self::toUTF8(utf8_decode(str_replace(array_keys(self::$utf8ToWin1252), array_values(self::$utf8ToWin1252), $text)));
    return $text;
  }
  
  static function UTF8FixWin1252Chars($text){
    // If you received an UTF-8 string that was converted from Windows-1252 as it was ISO8859-1 
    // (ignoring Windows-1252 chars from 80 to 9F) use this function to fix it.
    // See: http://en.wikipedia.org/wiki/Windows-1252
    
    return str_replace(array_keys(self::$brokenUtf8ToUtf8), array_values(self::$brokenUtf8ToUtf8), $text);
  }
  
  static function removeBOM($str=""){
    if(substr($str, 0,3) == pack("CCC",0xef,0xbb,0xbf)) {
      $str=substr($str, 3);
    }
    return $str;
  }
}