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63 lines
1.6 KiB
JavaScript
63 lines
1.6 KiB
JavaScript
dojo.provide("dojox.encoding.base64");
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(function(){
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var p="=";
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var tab="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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var dxe=dojox.encoding;
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dxe.base64.encode=function(/* byte[] */ba){
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// summary
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// Encode an array of bytes as a base64-encoded string
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var s=[], l=ba.length;
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var rm=l%3;
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var x=l-rm;
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for (var i=0; i<x;){
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var t=ba[i++]<<16|ba[i++]<<8|ba[i++];
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s.push(tab.charAt((t>>>18)&0x3f));
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s.push(tab.charAt((t>>>12)&0x3f));
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s.push(tab.charAt((t>>>6)&0x3f));
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s.push(tab.charAt(t&0x3f));
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}
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// deal with trailers, based on patch from Peter Wood.
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switch(rm){
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case 2:{
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var t=ba[i++]<<16|ba[i++]<<8;
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s.push(tab.charAt((t>>>18)&0x3f));
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s.push(tab.charAt((t>>>12)&0x3f));
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s.push(tab.charAt((t>>>6)&0x3f));
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s.push(p);
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break;
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}
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case 1:{
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var t=ba[i++]<<16;
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s.push(tab.charAt((t>>>18)&0x3f));
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s.push(tab.charAt((t>>>12)&0x3f));
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s.push(p);
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s.push(p);
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break;
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}
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}
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return s.join(""); // string
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};
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dxe.base64.decode=function(/* string */str){
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// summary
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// Convert a base64-encoded string to an array of bytes
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var s=str.split(""), out=[];
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var l=s.length;
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while(s[--l]==p){ } // strip off trailing padding
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for (var i=0; i<l;){
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var t=tab.indexOf(s[i++])<<18;
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if(i<=l){ t|=tab.indexOf(s[i++])<<12 };
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if(i<=l){ t|=tab.indexOf(s[i++])<<6 };
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if(i<=l){ t|=tab.indexOf(s[i++]) };
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out.push((t>>>16)&0xff);
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out.push((t>>>8)&0xff);
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out.push(t&0xff);
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}
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// strip off any null bytes
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while(out[out.length-1]==0){ out.pop(); }
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return out; // byte[]
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};
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})();
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