You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
114 lines
3.4 KiB
114 lines
3.4 KiB
/* Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>
|
|
* Version: 1.0
|
|
* LastModified: Dec 25 1999
|
|
* This library is free. You can redistribute it and/or modify it.
|
|
*/
|
|
|
|
/*
|
|
* Interfaces:
|
|
* b64 = base64encode(data);
|
|
* data = base64decode(b64);
|
|
*/
|
|
|
|
(function() {
|
|
|
|
var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
|
var base64DecodeChars = new Array(
|
|
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
|
|
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
|
|
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
|
|
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
|
|
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
|
|
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
|
|
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
|
|
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);
|
|
|
|
function base64encode(str) {
|
|
var out, i, len;
|
|
var c1, c2, c3;
|
|
|
|
len = str.length;
|
|
i = 0;
|
|
out = "";
|
|
while(i < len) {
|
|
c1 = str.charCodeAt(i++) & 0xff;
|
|
if(i == len)
|
|
{
|
|
out += base64EncodeChars.charAt(c1 >> 2);
|
|
out += base64EncodeChars.charAt((c1 & 0x3) << 4);
|
|
out += "==";
|
|
break;
|
|
}
|
|
c2 = str.charCodeAt(i++);
|
|
if(i == len)
|
|
{
|
|
out += base64EncodeChars.charAt(c1 >> 2);
|
|
out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
|
|
out += base64EncodeChars.charAt((c2 & 0xF) << 2);
|
|
out += "=";
|
|
break;
|
|
}
|
|
c3 = str.charCodeAt(i++);
|
|
out += base64EncodeChars.charAt(c1 >> 2);
|
|
out += base64EncodeChars.charAt(((c1 & 0x3)<< 4) | ((c2 & 0xF0) >> 4));
|
|
out += base64EncodeChars.charAt(((c2 & 0xF) << 2) | ((c3 & 0xC0) >>6));
|
|
out += base64EncodeChars.charAt(c3 & 0x3F);
|
|
}
|
|
return out;
|
|
}
|
|
|
|
function base64decode(str) {
|
|
var c1, c2, c3, c4;
|
|
var i, len, out;
|
|
|
|
len = str.length;
|
|
i = 0;
|
|
out = "";
|
|
while(i < len) {
|
|
/* c1 */
|
|
do {
|
|
c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
|
|
} while(i < len && c1 == -1);
|
|
if(c1 == -1)
|
|
break;
|
|
|
|
/* c2 */
|
|
do {
|
|
c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];
|
|
} while(i < len && c2 == -1);
|
|
if(c2 == -1)
|
|
break;
|
|
|
|
out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));
|
|
|
|
/* c3 */
|
|
do {
|
|
c3 = str.charCodeAt(i++) & 0xff;
|
|
if(c3 == 61)
|
|
return out;
|
|
c3 = base64DecodeChars[c3];
|
|
} while(i < len && c3 == -1);
|
|
if(c3 == -1)
|
|
break;
|
|
|
|
out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));
|
|
|
|
/* c4 */
|
|
do {
|
|
c4 = str.charCodeAt(i++) & 0xff;
|
|
if(c4 == 61)
|
|
return out;
|
|
c4 = base64DecodeChars[c4];
|
|
} while(i < len && c4 == -1);
|
|
if(c4 == -1)
|
|
break;
|
|
out += String.fromCharCode(((c3 & 0x03) << 6) | c4);
|
|
}
|
|
return out;
|
|
}
|
|
|
|
if (!window.btoa) window.btoa = base64encode;
|
|
if (!window.atob) window.atob = base64decode;
|
|
|
|
})();
|
|
|