<?php
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Party Tool
 *
 * The Initial Developer of the Original Code is
 * Ryan Flint <rflint@dslr.net>
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
class UnicodeComponent extends Object {
  /**
   * Unicode utilities. Converts and encodes characters up to 0xFFFF (65535)
   */
  function unicode2utf($char) {
    if ($char < 128) {
      $rv = chr($char);
    }

    else if ($char < 2048) {
      $rv = chr(192 + (($char - ($char % 64)) / 64));
      $rv .= chr(128 + ($char % 64));
    }

    else {
      $rv = chr(224 + (($char - ($char % 4096)) / 4096));
      $rv .= chr(128 + ((($char % 4096) - ($char % 64)) / 64));
      $rv .= chr(128 + ($char % 64));
    }

    return $rv;
  }

  function utf2unicode($char) {
    if (ord($char{0}) < 128)
      $rv = ord($char);

    else if (ord($char{0}) < 224)
      $rv = ((ord($char{0}) - 192) * 64) + (ord($char{1}) - 128);

    else if (ord($char{0}) < 240)
      $rv = ((ord($char{0}) - 224) * 4096) + ((ord($char{1}) - 128) * 64 + (ord($char{2}) - 128));

    else
      $rv = ((ord($char{0}) - 240) * 262144) + ((ord($char{1}) - 128) * 4096) + ((ord($char{2}) - 128) * 64) + (ord($char{3}) - 128);

    return $rv;
  }
}