stitchdatamanagerutils.h

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/*
* Copyright 2016 Autodesk, Inc. All rights reserved.
* Use of this software is subject to the terms of the Autodesk license agreement and any attachments or Appendices thereto provided at the time of installation or download,
* or which otherwise accompanies this software in either electronic or hard copy form, or which is signed by you and accepted by Autodesk.
*/

#pragma once

#include "gwnavruntime/base/types.h"

namespace Kaim
{

class MemoryManagerUtils
{
public:
    template<class T>
    static bool IsMemoryAlignedForClass(T* memory)
    {
        return IsMemoryAlignedForClassFromClassSize<(KyUInt32)sizeof(T)>((char*)memory);
    }

    template<class T>
    static  KyUInt32 GetPaddingForMemory(char* memory)
    {
        return GetPaddingForMemoryFromClassSize<(KyUInt32)sizeof(T)>(memory);
    }

    template<class T>
    static KyUInt32 GetPaddingForBytesCount(KyUInt32 currentBytesCount)
    {
        return GetPaddingForBytesCountFromClassSize<(KyUInt32)sizeof(T)>((UPInt)currentBytesCount);
    }

    template<KyUInt32 sizeOfClass>
    static inline bool IsMemoryAlignedForClassFromClassSize(char* memory)
    {
        return GetPaddingForMemoryFromClassSize<sizeOfClass>(memory) == 0;
    }

    template<KyUInt32 sizeOfClass>
    static inline KyUInt32 GetPaddingForMemoryFromClassSize(char* memory)
    {
        return GetPaddingForBytesCountFromClassSize<sizeOfClass>((UPInt)memory);
    }

    template<KyUInt32 sizeOfClass>
    static inline KyUInt32 GetPaddingForBytesCountFromClassSize(UPInt currentBytesCount)
    {
        if ((sizeOfClass & 0x1) != 0)
            // no padding
            return 0;
        else if ((sizeOfClass & 0x2) != 0)
            // padding to be 2 bytes aligned
            // need one 1 byte more if currentBytesCount is not already even
            return (KyUInt32)(currentBytesCount & 0x1);
        else
        {
#ifndef KY_64BIT_POINTERS
            // padding to be 4 bytes aligned
            // add
            return (KyUInt32)((4 - (currentBytesCount & 0x3)) & 0x3);
#else
            if ((sizeOfClass & 0x4) != 0)
                // padding to be 4 bytes aligned
                return (KyUInt32)((4 - (currentBytesCount & 0x3)) & 0x3);
            else
                // padding to be 8 bytes aligned
                return (KyUInt32)((8 - (currentBytesCount & 0x7)) & 0x7);
#endif
        }

    }


};


}