git.pond.sub.org Git - eow/blob - static/dojo-release-1.1.1/dojox/encoding/base64.js

   1 if(!dojo._hasResource["dojox.encoding.base64"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
   2 dojo._hasResource["dojox.encoding.base64"] = true;
   3 dojo.provide("dojox.encoding.base64");
   4
   5 (function(){
   6         var p="=";
   7         var tab="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
   8         var dxe=dojox.encoding;
   9
  10         dxe.base64.encode=function(/* byte[] */ba){
  11                 //      summary
  12                 //      Encode an array of bytes as a base64-encoded string
  13                 var s=[], l=ba.length;
  14                 var rm=l%3;
  15                 var x=l-rm;
  16                 for (var i=0; i<x;){
  17                         var t=ba[i++]<<16|ba[i++]<<8|ba[i++];
  18                         s.push(tab.charAt((t>>>18)&0x3f));
  19                         s.push(tab.charAt((t>>>12)&0x3f));
  20                         s.push(tab.charAt((t>>>6)&0x3f));
  21                         s.push(tab.charAt(t&0x3f));
  22                 }
  23                 //      deal with trailers, based on patch from Peter Wood.
  24                 switch(rm){
  25                         case 2:{
  26                                 var t=ba[i++]<<16|ba[i++]<<8;
  27                                 s.push(tab.charAt((t>>>18)&0x3f));
  28                                 s.push(tab.charAt((t>>>12)&0x3f));
  29                                 s.push(tab.charAt((t>>>6)&0x3f));
  30                                 s.push(p);
  31                                 break;
  32                         }
  33                         case 1:{
  34                                 var t=ba[i++]<<16;
  35                                 s.push(tab.charAt((t>>>18)&0x3f));
  36                                 s.push(tab.charAt((t>>>12)&0x3f));
  37                                 s.push(p);
  38                                 s.push(p);
  39                                 break;
  40                         }
  41                 }
  42                 return s.join("");      //      string
  43         };
  44
  45         dxe.base64.decode=function(/* string */str){
  46                 //      summary
  47                 //      Convert a base64-encoded string to an array of bytes
  48                 var s=str.split(""), out=[];
  49                 var l=s.length;
  50                 while(s[--l]==p){ }     //      strip off trailing padding
  51                 for (var i=0; i<l;){
  52                         var t=tab.indexOf(s[i++])<<18;
  53                         if(i<=l){ t|=tab.indexOf(s[i++])<<12 };
  54                         if(i<=l){ t|=tab.indexOf(s[i++])<<6 };
  55                         if(i<=l){ t|=tab.indexOf(s[i++]) };
  56                         out.push((t>>>16)&0xff);
  57                         out.push((t>>>8)&0xff);
  58                         out.push(t&0xff);
  59                 }
  60                 //      strip off any null bytes
  61                 while(out[out.length-1]==0){ out.pop(); }
  62                 return out;     //      byte[]
  63         };
  64 })();
  65
  66 }