twitst4tz

twitter statistics web application
Log | Files | Refs | README | LICENSE

bytesToUuid.js (775B)

      1 /**
      2  * Convert array of 16 byte values to UUID string format of the form:
      3  * XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
      4  */
      5 var byteToHex = [];
      6 for (var i = 0; i < 256; ++i) {
      7   byteToHex[i] = (i + 0x100).toString(16).substr(1);
      8 }
      9 
     10 function 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 ([
     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++]],
     22     bth[buf[i++]], bth[buf[i++]]
     23   ]).join('');
     24 }
     25 
     26 module.exports = bytesToUuid;