/*exported base64_encode, base64_decode */ function base64_encode (data) { // Twacked by Will Scullin to handle arrays of "bytes" // http://kevin.vanzonneveld.net // + original by: Tyler Akins (http://rumkin.com) // + improved by: Bayron Guevara // + improved by: Thunder.m // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + bugfixed by: Pellentesque Malesuada // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // - depends on: utf8_encode // * example 1: base64_encode('Kevin van Zonneveld'); // * returns 1: 'S2V2aW4gdmFuIFpvbm5ldmVsZA==' // mozilla has this native // - but breaks in 2.0.0.12! //if (typeof this.window['atob'] == 'function') { // return atob(data); //} var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; var o1, o2, o3, h1, h2, h3, h4, bits, i = 0, ac = 0, enc="", tmp_arr = []; if (!data) { return data; } do { // pack three octets into four hexets o1 = data[i++]; o2 = data[i++]; o3 = data[i++]; bits = o1<<16 | o2<<8 | o3; h1 = bits>>18 & 0x3f; h2 = bits>>12 & 0x3f; h3 = bits>>6 & 0x3f; h4 = bits & 0x3f; // use hexets to index into b64, and append result to encoded string tmp_arr[ac++] = b64.charAt(h1) + b64.charAt(h2) + b64.charAt(h3) + b64.charAt(h4); } while (i < data.length); enc = tmp_arr.join(''); switch (data.length % 3) { case 1: enc = enc.slice(0, -2) + '=='; break; case 2: enc = enc.slice(0, -1) + '='; break; } return enc; } function base64_decode(data) { // Twacked by Will Scullin to handle arrays of "bytes" // http://kevin.vanzonneveld.net // + original by: Tyler Akins (http://rumkin.com) // + improved by: Thunder.m // + input by: Aman Gupta // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + bugfixed by: Onno Marsman // + bugfixed by: Pellentesque Malesuada // + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // + input by: Brett Zamir (http://brett-zamir.me) // + bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net) // - depends on: utf8_decode // * example 1: base64_decode('S2V2aW4gdmFuIFpvbm5ldmVsZA=='); // * returns 1: 'Kevin van Zonneveld' // mozilla has this native // - but breaks in 2.0.0.12! //if (typeof this.window['btoa'] == 'function') { // return btoa(data); //} var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="; var o1, o2, o3, h1, h2, h3, h4, bits, i = 0, ac = 0, tmp_arr = []; if (!data) { return data; } do { // unpack four hexets into three octets using index points in b64 h1 = b64.indexOf(data.charAt(i++)); h2 = b64.indexOf(data.charAt(i++)); h3 = b64.indexOf(data.charAt(i++)); h4 = b64.indexOf(data.charAt(i++)); bits = h1<<18 | h2<<12 | h3<<6 | h4; o1 = bits>>16 & 0xff; o2 = bits>>8 & 0xff; o3 = bits & 0xff; tmp_arr[ac++] = o1; if (h3 != 64) { tmp_arr[ac++] = o2; } if (h4 != 64) { tmp_arr[ac++] = o3; } } while (i < data.length); return tmp_arr; }