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747 BJavaScriptView Raw
1/**
2 * Convert array of 16 byte values to UUID string format of the form:
3 * XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
4 */
5var byteToHex = [];
6for (var i = 0; i < 256; ++i) {
7 byteToHex[i] = (i + 0x100).toString(16).substr(1);
8}
9
10function bytesToUuid(buf, offset) {
11 var i = offset || 0;
12 var bth = byteToHex;
13 // join used to fix memory issue caused by concatenation: https://bugs.chromium.org/p/v8/issues/detail?id=3175#c4
14 return ([bth[buf[i++]], bth[buf[i++]],
15 bth[buf[i++]], bth[buf[i++]], '-',
16 bth[buf[i++]], bth[buf[i++]], '-',
17 bth[buf[i++]], bth[buf[i++]], '-',
18 bth[buf[i++]], bth[buf[i++]], '-',
19 bth[buf[i++]], bth[buf[i++]],
20 bth[buf[i++]], bth[buf[i++]],
21 bth[buf[i++]], bth[buf[i++]]]).join('');
22}
23
24module.exports = bytesToUuid;