From 15cd5d90f4861da24c971f5ea186d542c4d32067 Mon Sep 17 00:00:00 2001
From: David Williams <david@thermite3d.org>
Date: Mon, 9 Apr 2012 11:00:35 +0200
Subject: [PATCH] More validation of block sizes.

---
 .../PolyVoxCore/include/PolyVoxCore/SimpleVolume.inl | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/library/PolyVoxCore/include/PolyVoxCore/SimpleVolume.inl b/library/PolyVoxCore/include/PolyVoxCore/SimpleVolume.inl
index 14bed170..536fe065 100644
--- a/library/PolyVoxCore/include/PolyVoxCore/SimpleVolume.inl
+++ b/library/PolyVoxCore/include/PolyVoxCore/SimpleVolume.inl
@@ -177,12 +177,18 @@ namespace PolyVox
 	void SimpleVolume<VoxelType>::resize(const Region& regValidRegion, uint16_t uBlockSideLength)
 	{
 		//Debug mode validation
-		assert(uBlockSideLength > 0);
+		assert(uBlockSideLength >= 8);
+		assert(uBlockSideLength <= 256);
+		assert(isPowerOf2(uBlockSideLength));
 		
 		//Release mode validation
-		if(uBlockSideLength == 0)
+		if(uBlockSideLength < 8)
 		{
-			throw std::invalid_argument("Block side length cannot be zero.");
+			throw std::invalid_argument("Block side length should be at least 8");
+		}
+		if(uBlockSideLength > 256)
+		{
+			throw std::invalid_argument("Block side length should not be more than 256");
 		}
 		if(!isPowerOf2(uBlockSideLength))
 		{