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decode.ts
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decode.ts
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// private property
const _keyStr =
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
/**
* base64 加密
*/
export const encode = (content = '') => {
let input = content;
let output = '';
let chr1;
let chr2;
let chr3;
let enc1;
let enc2;
let enc3;
let enc4;
let i = 0;
input = _utf8_encode(input);
while (i < input.length) {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
// eslint-disable-next-line no-multi-assign
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output =
output +
_keyStr.charAt(enc1) +
_keyStr.charAt(enc2) +
_keyStr.charAt(enc3) +
_keyStr.charAt(enc4);
}
return output;
};
function _utf8_encode(content: string) {
const decode = content.replace(/\r\n/g, '\n');
let code = '';
for (let n = 0; n < decode.length; n++) {
const c = decode.charCodeAt(n);
if (c < 128) {
code += String.fromCharCode(c);
} else if (c > 127 && c < 2048) {
code += String.fromCharCode((c >> 6) | 192);
code += String.fromCharCode((c & 63) | 128);
} else {
code += String.fromCharCode((c >> 12) | 224);
code += String.fromCharCode(((c >> 6) & 63) | 128);
code += String.fromCharCode((c & 63) | 128);
}
}
return code;
}