@absmartly/javascript-sdk/es/murmur3_32.js

A/B Smartly Javascript SDK

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.murmur3_32 = void 0;
const C1 = 0xcc9e2d51;
const C2 = 0x1b873593;
const C3 = 0xe6546b64;
const imul32 = Math.imul;
function fmix32(h) {
  h ^= h >>> 16;
  h = imul32(h, 0x85ebca6b);
  h ^= h >>> 13;
  h = imul32(h, 0xc2b2ae35);
  h ^= h >>> 16;
  return h >>> 0;
}
function rotl32(a, b) {
  return a << b | a >>> 32 - b;
}
function scramble32(block) {
  return imul32(rotl32(imul32(block, C1), 15), C2);
}
function murmur3_32(key, hash) {
  hash = (hash || 0) >>> 0;
  const dataView = new DataView(key);
  let i;
  const n = dataView.byteLength & ~3;
  for (i = 0; i < n; i += 4) {
    const chunk = dataView.getUint32(i, true);
    hash ^= scramble32(chunk);
    hash = rotl32(hash, 13);
    hash = imul32(hash, 5) + C3;
  }
  let remaining = 0;
  switch (dataView.byteLength & 3) {
    case 3:
      remaining ^= dataView.getUint8(i + 2) << 16;
    case 2:
      remaining ^= dataView.getUint8(i + 1) << 8;
    case 1:
      remaining ^= dataView.getUint8(i);
      hash ^= scramble32(remaining);
    default:
      break;
  }
  hash ^= dataView.byteLength;
  hash = fmix32(hash);
  return hash >>> 0;
}
exports.murmur3_32 = murmur3_32;