95 lines
2.9 KiB
JavaScript
95 lines
2.9 KiB
JavaScript
export const Base64 = {
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_keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
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// Base64编码
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encode: function(e) {
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let t = "";
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let n, r, i, s, o, u, a;
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let f = 0;
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e = Base64._utf8_encode(e);
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while (f < e.length) {
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n = e.charCodeAt(f++);
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r = e.charCodeAt(f++);
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i = e.charCodeAt(f++);
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s = n >> 2;
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o = (n & 3) << 4 | r >> 4;
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u = (r & 15) << 2 | i >> 6;
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a = i & 63;
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if (isNaN(r)) {
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u = a = 64
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} else if (isNaN(i)) {
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a = 64
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}
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t = t + this._keyStr.charAt(s) + this._keyStr.charAt(o) + this._keyStr.charAt(u) + this._keyStr.charAt(a)
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}
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return t
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},
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// Base64解码
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decode: function(e) {
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let t = "";
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let n, r, i;
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let s, o, u, a;
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let f = 0;
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e=e.replace(/[^A-Za-z0-9+/=]/g,"");
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while (f < e.length) {
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s = this._keyStr.indexOf(e.charAt(f++));
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o = this._keyStr.indexOf(e.charAt(f++));
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u = this._keyStr.indexOf(e.charAt(f++));
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a = this._keyStr.indexOf(e.charAt(f++));
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n = s << 2 | o >> 4;
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r = (o & 15) << 4 | u >> 2;
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i = (u & 3) << 6 | a;
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t = t + String.fromCharCode(n);
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if (u != 64) {
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t = t + String.fromCharCode(r)
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}
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if (a != 64) {
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t = t + String.fromCharCode(i)
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}
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}
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t = Base64._utf8_decode(t);
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return t
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},
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_utf8_encode: function(e) {
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e = e.replace(/rn/g, "n");
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let t = "";
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for (let n = 0; n < e.length; n++) {
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let r = e.charCodeAt(n);
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if (r < 128) {
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t += String.fromCharCode(r)
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} else if (r > 127 && r < 2048) {
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t += String.fromCharCode(r >> 6 | 192);
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t += String.fromCharCode(r & 63 | 128)
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} else {
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t += String.fromCharCode(r >> 12 | 224);
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t += String.fromCharCode(r >> 6 & 63 | 128);
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t += String.fromCharCode(r & 63 | 128)
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}
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}
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return t
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},
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_utf8_decode: function(e) {
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let t = "";
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let n = 0;
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let r = c1 = c2 = 0;
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while (n < e.length) {
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r = e.charCodeAt(n);
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if (r < 128) {
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t += String.fromCharCode(r);
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n++
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} else if (r > 191 && r < 224) {
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c2 = e.charCodeAt(n + 1);
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t += String.fromCharCode((r & 31) << 6 | c2 & 63);
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n += 2
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} else {
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c2 = e.charCodeAt(n + 1);
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c3 = e.charCodeAt(n + 2);
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t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
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n += 3
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}
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}
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return t
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}
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};
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export default Base64;
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