@dillonkearns/elm-graphql
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25 lines (22 loc) • 747 B
JavaScript
/**
* Convert array of 16 byte values to UUID string format of the form:
* XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
*/
var byteToHex = [];
for (var i = 0; i < 256; ++i) {
byteToHex[i] = (i + 0x100).toString(16).substr(1);
}
function bytesToUuid(buf, offset) {
var i = offset || 0;
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;