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sdk/extensions/serialization/source/NvBlastExtSerializationInternal.h

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// Copyright (c) 2020 NVIDIA Corporation. All rights reserved.


#pragma once

#include "NvBlastExtSerialization.h"

#include <cstring>

#define ExtSerializerBoilerplate(_name, _description, _objectTypeID, _encodingID)   \
virtual const char* getName() const override { return _name; }                      \
virtual const char* getDescription() const override { return _description; }        \
virtual uint32_t    getObjectTypeID() const override { return _objectTypeID; }      \
virtual uint32_t    getEncodingID() const override { return _encodingID; }


#define ExtSerializerReadOnly(_name)                                                                \
virtual bool        isReadOnly() const override { return true; }                                    \
virtual uint64_t    serializeIntoBuffer                                                             \
(                                                                                                   \
    void*& buffer,                                                                                  \
    ExtSerialization::BufferProvider& bufferProvider,                                               \
    const void* object,                                                                             \
    uint64_t offset = 0                                                                             \
) override                                                                                          \
{                                                                                                   \
    NVBLAST_LOG_WARNING(#_name "::serializeIntoBuffer: ExtPxAsset_RAW serializer is read-only.");   \
    NV_UNUSED(buffer);                                                                              \
    NV_UNUSED(bufferProvider);                                                                      \
    NV_UNUSED(object);                                                                              \
    NV_UNUSED(offset);                                                                              \
    return 0;                                                                                       \
}


#define ExtSerializerDefaultFactoryAndRelease(_classname)   \
static ExtSerializer*   create()                            \
{                                                           \
    return NVBLAST_NEW(_classname) ();                      \
}                                                           \
virtual void release() override                             \
{                                                           \
    NVBLAST_DELETE(this, _classname);                       \
}


namespace Nv
{
namespace Blast
{

class ExtSerializer
{
public:
    virtual             ~ExtSerializer() {}

    virtual const char* getName() const = 0;

    virtual const char* getDescription() const = 0;

    virtual uint32_t    getObjectTypeID() const = 0;

    virtual uint32_t    getEncodingID() const = 0;

    virtual bool        isReadOnly() const { return false; }

    virtual void*       deserializeFromBuffer(const void* buffer, uint64_t size) = 0;

    virtual uint64_t    serializeIntoBuffer(void*& buffer, ExtSerialization::BufferProvider& bufferProvider, const void* object, uint64_t offset = 0) = 0;

    virtual void        release() = 0;
};


class ExtSerializationInternal : public ExtSerialization
{
public:
    virtual bool            registerSerializer(ExtSerializer& serializer) = 0;
    virtual bool            unregisterSerializer(ExtSerializer& serializer) = 0;

    virtual ExtSerializer*  findSerializer(uint32_t objectTypeID, uint32_t encodingID) = 0;

    enum { HeaderSize = 128 };
};


template<typename Factory, size_t N>
size_t ExtSerializationLoadSet(Nv::Blast::ExtSerializationInternal& serialization, Factory(&factories)[N])
{
    size_t count = 0;

    for (auto f : factories)
    {
        Nv::Blast::ExtSerializer* serializer = f();
        if (serializer != nullptr)
        {
            if (serialization.registerSerializer(*serializer))
            {
                ++count;
            }
            else
            {
                NVBLAST_LOG_ERROR("Nv::Blast::ExtSerializationLoadSet: failed to register serailizer:");
                NVBLAST_LOG_ERROR(serializer->getName());
                serializer->release();
            }
        }
        else
        {
            NVBLAST_LOG_ERROR("Nv::Blast::ExtSerializationLoadSet: failed to create serailizer.");
        }
    }

    return count;
}


class ExtIStream
{
public:
    enum Flags
    {
        LittleEndian = (1 << 0),
        Fail = (1 << 1)
    };

    ExtIStream(const void* buffer, size_t size) : m_buf(reinterpret_cast<const char*>(buffer)), m_flags(0)
    {
        m_cur = m_buf;
        m_end = m_buf + size;
        const uint16_t x = LittleEndian;
        m_flags = *reinterpret_cast<const char*>(&x);
    }

    bool    advance(ptrdiff_t diff)
    {
        m_cur += diff;
        if (m_cur < m_buf)
        {
            m_cur = m_buf;
            m_flags |= Fail;
            return false;
        }
        else
        if (m_cur > m_end)
        {
            m_cur = m_end;
            m_flags |= Fail;
            return false;
        }
        return true;
    }

    const void* view()
    {
        return m_cur;
    }

    bool    read(void* buffer, size_t size)
    {
        if (!canRead(size)) return false;
        std::memcpy(buffer, m_cur, size);
        m_cur += size;
        return true;
    }

    size_t  tellg() const { return m_cur - m_buf; }
    size_t  left()  const { return m_end - m_cur; }

    bool    eof() const { return m_cur >= m_end; }
    bool    fail() const { return (m_flags & Fail) != 0; }

private:
    const char* m_buf;
    const char* m_cur;
    const char* m_end;
    uint32_t    m_flags;

    bool    isLittleEndian() const { return (m_flags & LittleEndian) != 0; }

    bool    canRead(size_t size) const { return m_cur + size <= m_end; }

    template<typename T>
    friend  ExtIStream& operator >> (ExtIStream& s, T& x);
};

template<typename T>
NV_INLINE ExtIStream& operator >> (ExtIStream& s, T& x)
{
    if (s.canRead(sizeof(T)))
    {
        if (s.isLittleEndian())
        {
            x = *reinterpret_cast<const T*>(s.m_cur);
            s.m_cur += sizeof(T);
        }
        else
        {
            char* b = reinterpret_cast<char*>(&x) + sizeof(T);
            for (size_t n = sizeof(T); n--;) *--b = *s.m_cur++;
        }
    }
    else
    {
        s.m_flags |= ExtIStream::Fail;
    }
    return s;
}

}   // namespace Blast
}   // namespace Nv

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