git.pond.sub.org Git - eow/blob - static/dojo-release-1.1.1/dojox/encoding/easy64.js

   1 if(!dojo._hasResource["dojox.encoding.easy64"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
   2 dojo._hasResource["dojox.encoding.easy64"] = true;
   3 dojo.provide("dojox.encoding.easy64");
   4
   5 (function(){
   6         var c = function(input, length, result){
   7                 for(var i = 0; i < length; i += 3){
   8                         result.push(
   9                                 String.fromCharCode((input[i] >>> 2) + 33),
  10                                 String.fromCharCode(((input[i] & 3) << 4) + (input[i + 1] >>> 4) + 33),
  11                                 String.fromCharCode(((input[i + 1] & 15) << 2) + (input[i + 2] >>> 6) + 33),
  12                                 String.fromCharCode((input[i + 2] & 63) + 33)
  13                         );
  14                 }
  15         };
  16
  17         dojox.encoding.easy64.encode = function(input){
  18                 // summary: encodes input data in easy64 string
  19                 // input: Array: an array of numbers (0-255) to encode
  20                 var result = [], reminder = input.length % 3, length = input.length - reminder;
  21                 c(input, length, result);
  22                 if(reminder){
  23                         var t = input.slice(length);
  24                         while(t.length < 3){ t.push(0); }
  25                         c(t, 3, result);
  26                         for(var i = 3; i > reminder; result.pop(), --i);
  27                 }
  28                 return result.join(""); // String
  29         };
  30
  31         dojox.encoding.easy64.decode = function(input){
  32                 // summary: decodes the input string back to array of numbers
  33                 // input: String: the input string to decode
  34                 var n = input.length, r = [], b = [0, 0, 0, 0], i, j, d;
  35                 for(i = 0; i < n; i += 4){
  36                         for(j = 0; j < 4; ++j){ b[j] = input.charCodeAt(i + j) - 33; }
  37                         d = n - i;
  38                         for(j = d; j < 4; b[++j] = 0);
  39                         r.push(
  40                                 (b[0] << 2) + (b[1] >>> 4),
  41                                 ((b[1] & 15) << 4) + (b[2] >>> 2),
  42                                 ((b[2] & 3) << 6) + b[3]
  43                         );
  44                         for(j = d; j < 4; ++j, r.pop());
  45                 }
  46                 return r;
  47         };
  48 })();
  49
  50 }