2017년 2월 11일 토요일
==JavaScript==
[[category: JavaScript]]
function base64_decode(input) {
var keystr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
var output = "";
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
while (i < input.length) {
enc1 = keystr.indexOf(input.charAt(i++));
enc2 = keystr.indexOf(input.charAt(i++));
enc3 = keystr.indexOf(input.charAt(i++));
enc4 = keystr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) output += String.fromCharCode(chr2);
if (enc4 != 64) output += String.fromCharCode(chr3);
}
return utf8_decode(output);
}
document.write(base64_decode('4piFQeqwgOOBguS4rQ==')); // ★A가あ中
*Dependencies: [[utf8_decode]]
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