Minecraft 12w22a Zombie Pigmen Spawning

//found in bi.class by diff'ing bi.class from 12w22a minecraft.jar with bh.class from 12w21b minecraft.jar

===

public void a(acz paramacz, int paramInt1, int paramInt2, int paramInt3, Random paramRandom)
  {
    super.a(paramacz, paramInt1, paramInt2, paramInt3, paramRandom);

    if ((paramacz.u.e()) && (paramRandom.nextInt(2000) < paramacz.s))
    {
      int i = 0;
      while (!paramacz.h(paramInt1, i, paramInt3)) {
        i--;
      }
      if (!paramacz.h(paramInt1, i + 1, paramInt3))
      {
        ajm.a(paramacz, 57, paramInt1 + 0.5D, i + 1.1D, paramInt3 + 0.5D);
      }
    }
  }