old_contents: // Copyright (c) 2015 Uber Technologies, Inc.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  
  'use strict';
  
  var Buffer = require('buffer').Buffer;
  
  function LCG(seed) {
      var self = this;
      if (typeof seed === 'number') {
          self.last = seed;
      } else {
          self.last = Math.floor(Math.pow(2, 32) * Math.random());
      }
      self.mod = Math.pow(2, 32);
      self.mul = 214013;
      self.add = 253101;
  }
  
  LCG.prototype.rand = function rand() {
      var self = this;
      self.last = (self.mul * self.last + self.add) % self.mod;
      return self.last;
  };
  
  LCG.prototype.rand64 = function rand64() {
      var self = this;
      var ret = new Buffer(8);
      ret.writeUInt32BE(self.rand(), 0);
      ret.writeUInt32BE(self.rand(), 4);
      return ret;
  };
  
  module.exports = LCG;
  
new_contents: // Copyright (c) 2015 Uber Technologies, Inc.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  
  'use strict';
  
  var Buffer = require('buffer').Buffer;
  
  // NOTE: this RNG is not suitable for real usage, it exists only for a
  // predictable test/benchmark fixture.
  
  function LCG(seed) {
      var self = this;
      if (typeof seed === 'number') {
          self.last = seed;
      } else {
          self.last = Math.floor(Math.pow(2, 32) * Math.random());
      }
      self.mod = Math.pow(2, 32);
      self.mul = 214013;
      self.add = 253101;
  }
  
  LCG.prototype.rand = function rand() {
      var self = this;
      self.last = (self.mul * self.last + self.add) % self.mod;
      return self.last;
  };
  
  LCG.prototype.rand64 = function rand64() {
      var self = this;
      var ret = new Buffer(8);
      ret.writeUInt32BE(self.rand(), 0);
      ret.writeUInt32BE(self.rand(), 4);
      return ret;
  };
  
  module.exports = LCG;
  
subject: add not to not use in real code