base64 encode decode
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/32483/213081/base64.js
/**
* 来自http: //www1.tc711.com/tool/js/Base64.js
*/
var base64 = {
encodeChars:'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
decodeChars: [-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],
encode: function(str) {
var out, i, len;
var c1, c2, c3;
len = str.length;
i = 0;
out = '';
while (i < len) {
c1 = str.charCodeAt(i++) & 255;
if (i == len) {
out += this.encodeChars.charAt(c1 >> 2);
out += this.encodeChars.charAt((c1 & 3) << 4);
out += '==';
break;
}
c2 = str.charCodeAt(i++);
if (i == len) {
out += this.encodeChars.charAt(c1 >> 2);
out += this.encodeChars.charAt(((c1 & 3) << 4) | ((c2 & 240) >> 4));
out += this.encodeChars.charAt((c2 & 15) << 2);
out += '=';
break;
}
c3 = str.charCodeAt(i++);
out += this.encodeChars.charAt(c1 >> 2);
out += this.encodeChars.charAt(((c1 & 3) << 4) | ((c2 & 240) >> 4));
out += this.encodeChars.charAt(((c2 & 15) << 2) | ((c3 & 192) >> 6));
out += this.encodeChars.charAt(c3 & 63);
}
return out;
},
decode: function(str) {
var c1, c2, c3, c4;
var i, len, out;
len = str.length;
i = 0;
out = '';
while (i < len) {
do {
c1 = this.decodeChars[str.charCodeAt(i++) & 255];
}
while (i < len && c1 == -1);
if (c1 == -1)
break;
do {
c2 = this.decodeChars[str.charCodeAt(i++) & 255];
}
while (i < len && c2 == -1);
if (c2 == -1)
break;
out += String.fromCharCode((c1 << 2) | ((c2 & 48) >> 4));
do {
c3 = str.charCodeAt(i++) & 255;
if (c3 == 61)
return out;
c3 = this.decodeChars[c3];
}
while (i < len && c3 == -1);
if (c3 == -1)
break;
out += String.fromCharCode(((c2 & 15) << 4) | ((c3 & 60) >> 2));
do {
c4 = str.charCodeAt(i++) & 255;
if (c4 == 61)
return out;
c4 = this.decodeChars[c4];
}
while (i < len && c4 == -1);
if (c4 == -1)
break;
out += String.fromCharCode(((c3 & 3) << 6) | c4);
}
return out;
},
utf8to16: function(str) {
var out, i, len, c;
var char2, char3;
out = '';
len = str.length;
i = 0;
while (i < len) {
c = str.charCodeAt(i++);
switch (c >> 4) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
out += str.charAt(i - 1);
break;
case 12:
case 13:
char2 = str.charCodeAt(i++);
out += String.fromCharCode(((c & 31) << 6) | (char2 & 63));
break;
case 14:
char2 = str.charCodeAt(i++);
char3 = str.charCodeAt(i++);
out += String.fromCharCode(((c & 15) << 12) | ((char2 & 63) << 6) | ((char3 & 63) << 0));
break;
}
}
return out;
},
utf16to8: function(str) {
var out, i, len, c;
out = "";
len = str.length;
for (i = 0; i < len; i++) {
c = str.charCodeAt(i);
if ((c >= 0x0001) && (c <= 0x007F)) {
out += str.charAt(i);
} else if (c > 0x07FF) {
out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
} else {
out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
}
}
return out;
}
}