Fix NumberFormatException.

src/minecraft/net/minecraft/src/MathHelper.java

@@ -73,10 +73,11 @@ public class MathHelper
     }
     
     public static BigInteger floor_double_BigInteger(double val) {
-    	return new BigInteger(String.format("%.0f", Math.floor(val)));
+    	return new BigInteger(String.format("%.0f", Math.floor(normalize(val))));
     }
     
     public static BigInteger toBigInteger(double val) {
+    	val = normalize(val);
     	val = val < 0 ? Math.floor(val) + 1 : Math.floor(val);
     	return new BigInteger(String.format("%.0f", val));
     }
@@ -84,6 +85,12 @@ public class MathHelper
     public static BigDecimal toBigDecimal(BigInteger val) {
 		return new BigDecimal(new java.math.BigInteger(val.toByteArray()));
 	}
+    
+    public static double normalize(double val) {
+    	if(Double.isInfinite(val)) val = Double.MAX_VALUE * Math.signum(val);
+    	if(Double.isNaN(val)) val = 0;
+    	return val;
+    }
 
     public static float abs(float par0)
     {