Mash

Javascript

  function Mash() {
    var n = 0xefc8249d;
 
    var mash = function(data) {
      data = data.toString();
      for (var i = 0; i < data.length; i++) {
        n += data.charCodeAt(i);
        var h = 0.02519603282416938 * n;
        n = h >>> 0;
        h -= n;
        h *= n;
        n = h >>> 0;
        h -= n;
        n += h * 0x100000000; // 2^32
      }
      return (n >>> 0) * 2.3283064365386963e-10; // 2^-32
    };
 
    mash.version = 'Mash 0.9';
    return mash;
  }

C

mash.h:

static inline double mash(unsigned char *x) {
  static uint32_t n = 0xefc8249d;
  double h;
 
  while (*x) {
    n += *x++;
    h = 0.02519603282416938 * n;
    n = h;
    h -= n;
    h *= n;
    n = h;
    h -= n;
    n += h * 0x100000000ULL;
  }
  return n * 2.3283064365386963e-10; // 2^-32
}