Function uvintPack

lib/utils.js:1336–1365

* * @param {Number} val * @returns {Buffer}

(val)

 * @returns {Buffer}
 */
  function uvintPack(val) {
    const rv = [];
    if (val < 128) {
      rv.push(val);
    } else {
      let v = val;
      let numExtraBytes = 0;
      let numBits = v.toString(2).length;
      let reservedBits = numExtraBytes + 1;

      while (numBits > (8 - reservedBits)) {
        numExtraBytes += 1;
        numBits -= 8;
        reservedBits = Math.min(numExtraBytes + 1, 8);
        rv.push(v & 0xff);
        v >>= 8;
      }

      if (numExtraBytes > 8) {
        throw new Error(`Value ${val} is too big and cannot be encoded as vint`);
      }

      const n = 8 - numExtraBytes;
      v |= (0xff >> n) << n;
      rv.push(Math.abs(v));
    }

    rv.reverse();
    return Buffer.from(rv);
  }

  return {
    readVInt: readVInt,