54 lines
1.9 KiB
JavaScript
54 lines
1.9 KiB
JavaScript
const BASE64_KEYS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
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const HEXCHAR = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'];
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const BASE64_VALUES = new Array(123);
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for (let i = 0; i < 123; ++i)
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BASE64_VALUES[i] = 64;
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for (let i = 0; i < 64; ++i)
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BASE64_VALUES[BASE64_KEYS.charCodeAt(i)] = i;
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const _t = ['', '', '', ''];
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const uuidTemplate = _t.concat(_t, '-', _t, '-', _t, '-', _t, '-', _t, _t, _t);
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const indices = uuidTemplate.map(function (value, index) { return value === '-' ? NaN : index; }).filter(isFinite);
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const toBase64 = (uuid) => {
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let j = 2;
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let base64 = uuid.substring(0, j);
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for (let i = 2; i < 22; i += 2) {
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let hex1 = HEXCHAR.indexOf(uuid.charAt(indices[j++]));
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let hex2 = HEXCHAR.indexOf(uuid.charAt(indices[j++]));
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let hex3 = HEXCHAR.indexOf(uuid.charAt(indices[j++]));
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let lhs = (hex1 << 2) | (hex2 >> 2);
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let rhs = ((hex2 & 3) << 4) | hex3;
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base64 += BASE64_KEYS.charAt(lhs);
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base64 += BASE64_KEYS.charAt(rhs);
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}
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return base64;
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};
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const toUUID = (base64) => {
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let baselen = base64.length;
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if (baselen < 22) {
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return base64;
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}
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uuidTemplate[0] = base64[0];
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uuidTemplate[1] = base64[1];
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for (let i = 2, j = 2; i < 22; i += 2) {
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let lhs = BASE64_VALUES[base64.charCodeAt(i)];
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let rhs = BASE64_VALUES[base64.charCodeAt(i + 1)];
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uuidTemplate[indices[j++]] = HEXCHAR[lhs >> 2];
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uuidTemplate[indices[j++]] = HEXCHAR[((lhs & 3) << 2) | rhs >> 4];
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uuidTemplate[indices[j++]] = HEXCHAR[rhs & 0xF];
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}
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return uuidTemplate.join('');
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};
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const args = process.argv;
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const cmd = args[2];
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const value = args[3];
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if (cmd && value) {
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switch (cmd) {
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case 'u2b':
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console.log(toBase64(value));
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break;
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case 'b2u':
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console.log(toUUID(value));
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break;
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}
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}
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