FloatByteOrder.h

/*
 * Copyright (c) 2018, Automatak LLC
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 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
 * disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
 * disclaimer in the documentation and/or other materials provided with the distribution.
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 * products derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 */
#ifndef SER4CPP_FLOAT_BYTE_ORDER_H
#define SER4CPP_FLOAT_BYTE_ORDER_H

#include "ser4cpp/util/Uncopyable.h"

#include <cstdint>

namespace ser4cpp
{

struct FloatByteOrder : private StaticOnly
{
public:
    enum class Value : uint8_t
    {
        normal,
        reverse,
        unsupported
    };

    static Value order()
    {
        static Value order = get_byte_order();
        return order;
    }

private:
    union FloatUnion
    {
        uint8_t bytes[4];
        float f;
    };

    static Value get_byte_order()
    {
        if (is_normal_byte_order())
        {
            return FloatByteOrder::Value::normal;
        }
        else if (is_reverse_byte_order())
        {
            return FloatByteOrder::Value::reverse;
        }
        else
        {
            return FloatByteOrder::Value::unsupported;
        }
    }

    static bool is_normal_byte_order()
    {
        FloatUnion value = {{ 0x00, 0x00, 0xA0, 0xC1 }};
        return (value.f == -20.0f);
    }

    static bool is_reverse_byte_order()
    {
        FloatUnion value = {{ 0xC1, 0xA0, 0x00, 0x00 }};
        return (value.f == -20.0f);
    }
};

}

#endif