cione-comp-lib
Version:
`$ yarn add cione-comp-lib` 或者 `$ npm i cione-comp-lib -S`
49 lines (48 loc) • 2.59 kB
JavaScript
const _hasbtoa = typeof btoa === "function";
const _hasBuffer = typeof Buffer === "function";
typeof TextDecoder === "function" ? new TextDecoder() : void 0;
const _TE = typeof TextEncoder === "function" ? new TextEncoder() : void 0;
const b64ch = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
const b64chs = Array.prototype.slice.call(b64ch);
((a) => {
let tab = {};
a.forEach((c, i) => tab[c] = i);
return tab;
})(b64chs);
const _fromCC = String.fromCharCode.bind(String);
typeof Uint8Array.from === "function" ? Uint8Array.from.bind(Uint8Array) : (it) => new Uint8Array(Array.prototype.slice.call(it, 0));
const _mkUriSafe = (src) => src.replace(/=/g, "").replace(/[+\/]/g, (m0) => m0 == "+" ? "-" : "_");
const btoaPolyfill = (bin) => {
let u32, c0, c1, c2, asc = "";
const pad = bin.length % 3;
for (let i = 0; i < bin.length; ) {
if ((c0 = bin.charCodeAt(i++)) > 255 || (c1 = bin.charCodeAt(i++)) > 255 || (c2 = bin.charCodeAt(i++)) > 255)
throw new TypeError("invalid character found");
u32 = c0 << 16 | c1 << 8 | c2;
asc += b64chs[u32 >> 18 & 63] + b64chs[u32 >> 12 & 63] + b64chs[u32 >> 6 & 63] + b64chs[u32 & 63];
}
return pad ? asc.slice(0, pad - 3) + "===".substring(pad) : asc;
};
const _btoa = _hasbtoa ? (bin) => btoa(bin) : _hasBuffer ? (bin) => Buffer.from(bin, "binary").toString("base64") : btoaPolyfill;
const _fromUint8Array = _hasBuffer ? (u8a) => Buffer.from(u8a).toString("base64") : (u8a) => {
const maxargs = 4096;
let strs = [];
for (let i = 0, l = u8a.length; i < l; i += maxargs) {
strs.push(_fromCC.apply(null, u8a.subarray(i, i + maxargs)));
}
return _btoa(strs.join(""));
};
const cb_utob = (c) => {
if (c.length < 2) {
var cc = c.charCodeAt(0);
return cc < 128 ? c : cc < 2048 ? _fromCC(192 | cc >>> 6) + _fromCC(128 | cc & 63) : _fromCC(224 | cc >>> 12 & 15) + _fromCC(128 | cc >>> 6 & 63) + _fromCC(128 | cc & 63);
} else {
var cc = 65536 + (c.charCodeAt(0) - 55296) * 1024 + (c.charCodeAt(1) - 56320);
return _fromCC(240 | cc >>> 18 & 7) + _fromCC(128 | cc >>> 12 & 63) + _fromCC(128 | cc >>> 6 & 63) + _fromCC(128 | cc & 63);
}
};
const re_utob = /[\uD800-\uDBFF][\uDC00-\uDFFFF]|[^\x00-\x7F]/g;
const utob = (u) => u.replace(re_utob, cb_utob);
const _encode = _hasBuffer ? (s) => Buffer.from(s, "utf8").toString("base64") : _TE ? (s) => _fromUint8Array(_TE.encode(s)) : (s) => _btoa(utob(s));
const encode = (src, urlsafe = false) => urlsafe ? _mkUriSafe(_encode(src)) : _encode(src);
export { _btoa as btoa, btoaPolyfill, encode, encode as toBase64, utob };