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 /*
 * Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */
 
 #ifndef B2_BLOCK_ALLOCATOR_H
 #define B2_BLOCK_ALLOCATOR_H
 
 #include <Box2D/Common/b2Settings.h>
 
 const int32 b2_chunkSize = 16 * 1024;
 const int32 b2_maxBlockSize = 640;
 const int32 b2_blockSizes = 14;
 const int32 b2_chunkArrayIncrement = 128;
 
 struct b2Block;
 struct b2Chunk;
 
 /// This is a small object allocator used for allocating small
 /// objects that persist for more than one time step.
 /// See: http://www.codeproject.com/useritems/Small_Block_Allocator.asp
 class b2BlockAllocator
 {
 public:
     b2BlockAllocator();
     ~b2BlockAllocator();
 
     /// Allocate memory. This will use b2Alloc if the size is larger than b2_maxBlockSize.
     void* Allocate(int32 size);
 
     /// Free memory. This will use b2Free if the size is larger than b2_maxBlockSize.
     void Free(void* p, int32 size);
 
     void Clear();
 
 private:
 
     b2Chunk* m_chunks;
     int32 m_chunkCount;
     int32 m_chunkSpace;
 
     b2Block* m_freeLists[b2_blockSizes];
 
     static int32 s_blockSizes[b2_blockSizes];
     static uint8 s_blockSizeLookup[b2_maxBlockSize + 1];
     static bool s_blockSizeLookupInitialized;
 };
 
 #endif