blobarray.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
{

template <class T>
class BlobArray
{
    KY_DEFINE_NEW_DELETE_OPERATORS(Stat_Default_Mem)
public:
    typedef T ValueType;

    // ------------------------------ Functions -----------------------------

    BlobArray() : m_count(0), m_offset(0) {}

    const T* GetValues() const { return (const T*)((char*)&m_offset + m_offset); }

    T* GetValues() { return (T*)((char*)&m_offset + m_offset); }

    KyUInt32 GetCount() const { return m_count; }

public: // internal
    KyUInt32 m_count; 
    KyInt32 m_offset; 
};



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

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

        T* values = self.GetValues();
        for (KyUInt32 i = 0; i < self.m_count; ++i)
            SwapEndianness(e, values[i]);
    }
    else
    {
        // use count and values before they are swapped
        KyUInt32 count = self.m_count;
        T* values = self.GetValues();

        SwapEndianness(e, self.m_count);
        SwapEndianness(e, self.m_offset);

        for (KyUInt32 i = 0; i < count; ++i)
            SwapEndianness(e, values[i]);
    }
}


// Helper template function to initialiaze Array<> from BlobArray<>
// Each element of the Array<> is initialized with operator=(blobElement)
template <class ArrayT, class BlobArrayT>
void InitArrayFromBlobArray_Assign(ArrayT& kyArray, const BlobArrayT& blobArray)
{
    const typename BlobArrayT::ValueType* blobValues = blobArray.GetValues();
    KyUInt32 blobValuesCount                = blobArray.GetCount();
    kyArray.Clear();
    kyArray.Resize(blobValuesCount);
    for (KyUInt32 i = 0; i < blobValuesCount; ++i)
        kyArray[i] = blobValues[i];
}

// Helper template function to initialiaze Array<> from BlobArray<>
// Each element of the Array<> is initialized with InitFromBlob(blobElement)
template <class ArrayT, class BlobArrayT>
void InitArrayFromBlobArray_InitFromBlob(ArrayT& kyArray, const BlobArrayT& blobArray)
{
    const typename BlobArrayT::ValueType* blobValues = blobArray.GetValues();
    KyUInt32 blobValuesCount                = blobArray.GetCount();
    kyArray.Clear();
    kyArray.Resize(blobValuesCount);
    for (KyUInt32 i = 0; i < blobValuesCount; ++i)
        kyArray[i].InitFromBlob(blobValues[i]);
}

// Helper template function to initialize Array<String> from BlobArray<BlobArray<char> >
template <class ArrayT, class BlobArrayT>
void InitArrayFromBlobArray_String(ArrayT& kyArray, const BlobArrayT& blobArray)
{
    const typename BlobArrayT::ValueType* blobValues = blobArray.GetValues();
    KyUInt32 blobValuesCount                = blobArray.GetCount();
    kyArray.Clear();
    kyArray.Resize(blobValuesCount);
    for (KyUInt32 i = 0; i < blobValuesCount; ++i)
        kyArray[i] = blobValues[i].GetValues();
}


}