/** * 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;