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; 25