uint32_t Hash64WithSeedsLow(const char* s, size_t len, uint64_t seed0, uint64_t seed1) {
  return static_cast<uint32_t>(Hash64WithSeeds(s, len, seed0, seed1));
}

uint32_t Hash64WithSeedsHigh(const char* s, size_t len, uint64_t seed0, uint64_t seed1) {
  return static_cast<uint32_t>(Hash64WithSeeds(s, len, seed0, seed1) >> 32);
}

// Hash the concatenation of the given string with itself.
uint64_t Hash64WithSeedsD(const char* s, size_t len, uint64_t seed0, uint64_t seed1) {
  char buf[8000];
  char* ss = len*2 > sizeof(buf) ? (char*)malloc(len*2) : buf;
  memcpy(ss, s, len);
  memcpy(ss + len, s, len);
  uint64_t h = Hash64WithSeeds(ss, len*2, seed0, seed1);
  if (ss != buf) free(ss);
  return h;
}

// Hash the concatenation of the given string with itself.
uint32_t Hash64WithSeedsDLow(const char* s, size_t len, uint64_t seed0, uint64_t seed1) {
  return static_cast<uint32_t>(Hash64WithSeedsD(s, len, seed0, seed1));
}

// Hash the concatenation of the given string with itself.
uint32_t Hash64WithSeedsDHigh(const char* s, size_t len, uint64_t seed0, uint64_t seed1) {
  return static_cast<uint32_t>(Hash64WithSeedsD(s, len, seed0, seed1) >> 32);
}

// Hash the concatenation of the given string with 3 copies of itself.
uint64_t Hash64WithSeedsQ(const char* s, size_t len, uint64_t seed0, uint64_t seed1) {
  char buf[8000];
  char* ss = len*4 > sizeof(buf) ? (char*)malloc(len*4) : buf;
  memcpy(ss, s, len);
  memcpy(ss + len, s, len);
  memcpy(ss + len*2, ss, len*2);
  uint64_t h = Hash64WithSeeds(ss, len*4, seed0, seed1);
  if (ss != buf) free(ss);
  return h;
}

// Hash the concatenation of the given string with 3 copies of itself.
uint32_t Hash64WithSeedsQLow(const char* s, size_t len, uint64_t seed0, uint64_t seed1) {
  return static_cast<uint32_t>(Hash64WithSeedsQ(s, len, seed0, seed1));
}

// Hash the concatenation of the given string with 3 copies of itself.
uint32_t Hash64WithSeedsQHigh(const char* s, size_t len, uint64_t seed0, uint64_t seed1) {
  return static_cast<uint32_t>(Hash64WithSeedsQ(s, len, seed0, seed1) >> 32);
}