29 lines
1.4 KiB
JavaScript
29 lines
1.4 KiB
JavaScript
import validate from './validate.js';
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/**
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* Convert array of 16 byte values to UUID string format of the form:
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* XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
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*/
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const byteToHex = [];
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for (let i = 0; i < 256; ++i) {
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byteToHex.push((i + 0x100).toString(16).substr(1));
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}
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function stringify(arr, offset = 0) {
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// Note: Be careful editing this code! It's been tuned for performance
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// and works in ways you may not expect. See https://github.com/uuidjs/uuid/pull/434
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const uuid = (byteToHex[arr[offset + 0]] + byteToHex[arr[offset + 1]] + byteToHex[arr[offset + 2]] + byteToHex[arr[offset + 3]] + '-' + byteToHex[arr[offset + 4]] + byteToHex[arr[offset + 5]] + '-' + byteToHex[arr[offset + 6]] + byteToHex[arr[offset + 7]] + '-' + byteToHex[arr[offset + 8]] + byteToHex[arr[offset + 9]] + '-' + byteToHex[arr[offset + 10]] + byteToHex[arr[offset + 11]] + byteToHex[arr[offset + 12]] + byteToHex[arr[offset + 13]] + byteToHex[arr[offset + 14]] + byteToHex[arr[offset + 15]]).toLowerCase(); // Consistency check for valid UUID. If this throws, it's likely due to one
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// of the following:
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// - One or more input array values don't map to a hex octet (leading to
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// "undefined" in the uuid)
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// - Invalid input values for the RFC `version` or `variant` fields
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if (!validate(uuid)) {
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throw TypeError('Stringified UUID is invalid');
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}
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return uuid;
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}
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export default stringify; |