@sagi.io/maxmind/lib/utils.js

IP lookup using Maxmind databases

'use strict';

exports.concat2 = function(a, b) {
  return (a << 8) | b;
};

exports.concat3 = function(a, b, c) {
  return (a << 16) | (b << 8) | c;
};

exports.concat4 = function(a, b, c, d) {
  return (a << 24) | (b << 16) | (c << 8) | d;
};

exports.legacyErrorMessage =
  'Maxmind v1 module has changed API.\n\
  Upgrade instructions can be found here: \
  https://github.com/runk/node-maxmind/wiki/Migration-guide\n\
  If you want to use legacy libary then explicitly install maxmind@0.6';