blobref.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/endianness.h"
#include "gwnavruntime/base/memory.h"


namespace Kaim
{


class BlobRefImpl
{
    KY_DEFINE_NEW_DELETE_OPERATORS(Stat_Default_Mem)

public:
    // Constructs a new instance of this class.
    KY_INLINE BlobRefImpl() : m_shallowBlobSize(0), m_offset(0) {}

    KY_INLINE void* Ptr() const
    {
        if (m_shallowBlobSize == 0)
            return nullptr;
        else
            return (void*)((char*)&m_offset + m_offset);
    }

public:
    KyUInt32 m_shallowBlobSize;
    KyInt32 m_offset;

private:
    BlobRefImpl& operator=(const BlobRefImpl& other);
    BlobRefImpl(const BlobRefImpl& other);
};



template <class T>
class BlobRef
{
    KY_DEFINE_NEW_DELETE_OPERATORS(Stat_Default_Mem)

public:
    KY_INLINE BlobRef() {}

    KY_INLINE T* Ptr() const { return (T*)m_impl.Ptr(); }

    KY_INLINE KyUInt32 ShallowBlobSize() const { return m_impl.m_shallowBlobSize; }
public:
    BlobRefImpl m_impl;

private:
    BlobRef& operator=(const BlobRef& blobRef);
    BlobRef(const BlobRef& blobRef);
};


// --------------------------------- inline implementation ---------------------------------

template <class T>
void SwapEndianness(Endianness::Target e, BlobRef<T>& self)
{
    if (e == Endianness::SYSTEM_ENDIANNESS)
    {
        // use count and values once they have been swapped
        SwapEndianness(e, self.m_impl.m_shallowBlobSize);
        SwapEndianness(e, self.m_impl.m_offset);

        if (self.m_impl.m_shallowBlobSize != 0)
            SwapEndianness(e, *self.Ptr());
    }
    else
    {
        // use shallowBlobSize and value before they are swapped
        KyUInt32 shallowBlobSize = self.m_impl.m_shallowBlobSize;
        T* value = self.Ptr();

        SwapEndianness(e, self.m_impl.m_shallowBlobSize);
        SwapEndianness(e, self.m_impl.m_offset);

        if (shallowBlobSize != 0)
            SwapEndianness(e, *value);
    }
}


}