// Copyright (C) 2014-2016 Regis Houssin	<regis.houssin@capnetworks.com>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// or see http://www.gnu.org/

//
// \file       /milestone/core/js/lib_head.js
// \brief      File that include javascript functions (included if option use_javascript activated)
//

/**
*
*  Base64 encode / decode
*  http://www.webtoolkit.info/
*
**/

var Base64 = {

   // private property
   _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

   // public method for encoding
   encode : function (input) {
       var output = "";
       var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
       var i = 0;

       input = Base64._utf8_encode(input);

       while (i < input.length) {

           chr1 = input.charCodeAt(i++);
           chr2 = input.charCodeAt(i++);
           chr3 = input.charCodeAt(i++);

           enc1 = chr1 >> 2;
           enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
           enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
           enc4 = chr3 & 63;

           if (isNaN(chr2)) {
               enc3 = enc4 = 64;
           } else if (isNaN(chr3)) {
               enc4 = 64;
           }

           output = output +
           this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
           this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

       }

       return output;
   },

   // public method for decoding
   decode : function (input) {
       var output = "";
       var chr1, chr2, chr3;
       var enc1, enc2, enc3, enc4;
       var i = 0;

       input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

       while (i < input.length) {

           enc1 = this._keyStr.indexOf(input.charAt(i++));
           enc2 = this._keyStr.indexOf(input.charAt(i++));
           enc3 = this._keyStr.indexOf(input.charAt(i++));
           enc4 = this._keyStr.indexOf(input.charAt(i++));

           chr1 = (enc1 << 2) | (enc2 >> 4);
           chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
           chr3 = ((enc3 & 3) << 6) | enc4;

           output = output + String.fromCharCode(chr1);

           if (enc3 != 64) {
               output = output + String.fromCharCode(chr2);
           }
           if (enc4 != 64) {
               output = output + String.fromCharCode(chr3);
           }

       }

       output = Base64._utf8_decode(output);

       return output;

   },

   // private method for UTF-8 encoding
   _utf8_encode : function (string) {
       string = string.replace(/\r\n/g,"\n");
       var utftext = "";

       for (var n = 0; n < string.length; n++) {

           var c = string.charCodeAt(n);

           if (c < 128) {
               utftext += String.fromCharCode(c);
           }
           else if((c > 127) && (c < 2048)) {
               utftext += String.fromCharCode((c >> 6) | 192);
               utftext += String.fromCharCode((c & 63) | 128);
           }
           else {
               utftext += String.fromCharCode((c >> 12) | 224);
               utftext += String.fromCharCode(((c >> 6) & 63) | 128);
               utftext += String.fromCharCode((c & 63) | 128);
           }

       }

       return utftext;
   },

   // private method for UTF-8 decoding
   _utf8_decode : function (utftext) {
       var string = "";
       var i = 0;
       var c = c1 = c2 = 0;

       while ( i < utftext.length ) {

           c = utftext.charCodeAt(i);

           if (c < 128) {
               string += String.fromCharCode(c);
               i++;
           }
           else if((c > 191) && (c < 224)) {
               c2 = utftext.charCodeAt(i+1);
               string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
               i += 2;
           }
           else {
               c2 = utftext.charCodeAt(i+1);
               c3 = utftext.charCodeAt(i+2);
               string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
               i += 3;
           }

       }

       return string;
   }

}