47 lines
1.7 KiB
JavaScript
47 lines
1.7 KiB
JavaScript
Ext.util.base64 = {
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base64s : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
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encode: function(decStr){
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if (typeof btoa === 'function') {
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return btoa(decStr);
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}
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var base64s = this.base64s;
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var bits;
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var dual;
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var i = 0;
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var encOut = "";
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while(decStr.length >= i + 3){
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bits = (decStr.charCodeAt(i++) & 0xff) <<16 | (decStr.charCodeAt(i++) & 0xff) <<8 | decStr.charCodeAt(i++) & 0xff;
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encOut += base64s.charAt((bits & 0x00fc0000) >>18) + base64s.charAt((bits & 0x0003f000) >>12) + base64s.charAt((bits & 0x00000fc0) >> 6) + base64s.charAt((bits & 0x0000003f));
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}
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if(decStr.length -i > 0 && decStr.length -i < 3){
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dual = Boolean(decStr.length -i -1);
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bits = ((decStr.charCodeAt(i++) & 0xff) <<16) | (dual ? (decStr.charCodeAt(i) & 0xff) <<8 : 0);
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encOut += base64s.charAt((bits & 0x00fc0000) >>18) + base64s.charAt((bits & 0x0003f000) >>12) + (dual ? base64s.charAt((bits & 0x00000fc0) >>6) : '=') + '=';
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}
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return(encOut);
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},
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decode: function(encStr){
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if (typeof atob === 'function') {
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return atob(encStr);
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}
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var base64s = this.base64s;
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var bits;
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var decOut = "";
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var i = 0;
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for(; i<encStr.length; i += 4){
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bits = (base64s.indexOf(encStr.charAt(i)) & 0xff) <<18 | (base64s.indexOf(encStr.charAt(i +1)) & 0xff) <<12 | (base64s.indexOf(encStr.charAt(i +2)) & 0xff) << 6 | base64s.indexOf(encStr.charAt(i +3)) & 0xff;
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decOut += String.fromCharCode((bits & 0xff0000) >>16, (bits & 0xff00) >>8, bits & 0xff);
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}
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if(encStr.charCodeAt(i -2) == 61){
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return(decOut.substring(0, decOut.length -2));
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}
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else if(encStr.charCodeAt(i -1) == 61){
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return(decOut.substring(0, decOut.length -1));
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}
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else {
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return(decOut);
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}
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}
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} |