blobfileheader.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 BaseBlobHandler;

class BlobFileHeader
{
    KY_DEFINE_NEW_DELETE_OPERATORS(Stat_Default_Mem)
public:
    static const char* MagicString() { return "BlobFile"; }

    BlobFileHeader();

    /* Sets the whole structure to zeros */
    void Clear();

    /* Copy memoryBuffer to this and fix the endianness if needed.
        Typically called when loading a Blob from a buffer or a file. */
    KyResult InitFromBuffer(void* memoryBuffer, bool& isEndiannessSwap);

    /* Typically called when saving a Blob to a buffer or a file */
    void Init(KyUInt32 blobTypeId, KyUInt32 blobTypeVersion, KyUInt32 deepBlobSize, KyUInt32 shallowBlobSize);

    void Init(const BaseBlobHandler& blobHandler);

    /* GetEndianness() works even if the endianness of the structure is swapped */
    Endianness::Type GetEndianness() const;

    /* Swap endianness in place.
        After SwapEndianness() is called, all subsequent calls to BlobFileHeader are invalid !
        Swaps also m_endianness from little to big or big to little */
    void SwapEndianness();

public:
    char m_magicString[12]; // BlobFile0000
    KyUInt32 m_endianness;
    KyUInt32 m_blobTypeId;
    KyUInt32 m_blobTypeVersion;
    KyUInt32 m_deepBlobSize;
    KyUInt32 m_shallowBlobSize;
};


}