68 lines
2.1 KiB
JavaScript
68 lines
2.1 KiB
JavaScript
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function base64decode( data ) {
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// Decodes string using MIME base64 algorithm
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//
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// version: 903.3016
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// discuss at: http://phpjs.org/functions/base64_decode
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// + original by: Tyler Akins (http://rumkin.com)
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// + improved by: Thunder.m
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// + input by: Aman Gupta
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// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
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// + bugfixed by: Onno Marsman
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// + bugfixed by: Pellentesque Malesuada
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// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
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// + input by: Brett Zamir (http://brettz9.blogspot.com)
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// + bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
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// - depends on: utf8_decode
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// * example 1: base64_decode('S2V2aW4gdmFuIFpvbm5ldmVsZA==');
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// * returns 1: 'Kevin van Zonneveld'
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// mozilla has this native
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// - but breaks in 2.0.0.12!
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//if (typeof window['btoa'] == 'function') {
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// return btoa(data);
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//}
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var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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var o1, o2, o3, h1, h2, h3, h4, bits, i = 0, ac = 0, dec = "", tmp_arr = [];
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if (!data) {
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return data;
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}
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data += '';
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do { // unpack four hexets into three octets using index points in b64
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h1 = b64.indexOf(data.charAt(i++));
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h2 = b64.indexOf(data.charAt(i++));
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h3 = b64.indexOf(data.charAt(i++));
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h4 = b64.indexOf(data.charAt(i++));
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bits = h1<<18 | h2<<12 | h3<<6 | h4;
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o1 = bits>>16 & 0xff;
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o2 = bits>>8 & 0xff;
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o3 = bits & 0xff;
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if (h3 == 64) {
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tmp_arr[ac++] = String.fromCharCode(o1);
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} else if (h4 == 64) {
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tmp_arr[ac++] = String.fromCharCode(o1, o2);
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} else {
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tmp_arr[ac++] = String.fromCharCode(o1, o2, o3);
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}
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} while (i < data.length);
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dec = tmp_arr.join('');
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//dec = utf8_decode(dec);
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return dec;
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}
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var b64a=document.getElementsByTagName("span"), i=b64a.length-1;
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while (i>-1){
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if(b64a[i].className=="b64"){
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var b64html=b64a[i].innerHTML;
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b64html=base64decode(b64html);
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b64a[i].innerHTML=b64html;
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}
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i--
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}
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