@goa/uuid
Version:
[fork] Simple, fast generation of RFC4122 UUIDS.
25 lines (22 loc) • 760 B
JavaScript
/**
* Convert array of 16 byte values to UUID string format of the form:
* XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
*/
var byteToHex = []
for (var j = 0; j < 256; ++j) {
byteToHex[j] = (j + 0x100).toString(16).substr(1)
}
function bytesToUuid(buf, offset = 0) {
var i = offset
var bth = byteToHex
// join used to fix memory issue caused by concatenation: https://bugs.chromium.org/p/v8/issues/detail?id=3175#c4
return ([bth[buf[i++]], bth[buf[i++]],
bth[buf[i++]], bth[buf[i++]], '-',
bth[buf[i++]], bth[buf[i++]], '-',
bth[buf[i++]], bth[buf[i++]], '-',
bth[buf[i++]], bth[buf[i++]], '-',
bth[buf[i++]], bth[buf[i++]],
bth[buf[i++]], bth[buf[i++]],
bth[buf[i++]], bth[buf[i++]]]).join('')
}
module.exports = bytesToUuid