src/libs/decoders/archive.h

/*
This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to <https://unlicense.org>
*/

#ifndef ARCHIVE_H__
#define ARCHIVE_H__

#include <stdint.h>
#include <string>
#include <cassert>
#include <algorithm>

#include <vector>
#include <deque>
#include <list>
#include <set>
#include <map>

#include <exception>
#include <stdexcept>

namespace EndianSwapper
{
    class SwapByteBase
    {
        public:
            static bool ShouldSwap()
            {
                static const uint16_t swapTest = 1;
                return (*((char*)&swapTest) == 1);
            }

            static void SwapBytes(uint8_t& v1, uint8_t& v2)
            {
                uint8_t tmp = v1;
                v1 = v2;
                v2 = tmp;
            }
    };

    template <class T, int S>
        class SwapByte : public SwapByteBase
    {
        public:
            static T Swap(T v)
            {
                assert(false); // Shoud not be here...
                return v;
            }
    };

    template <class T>
        class SwapByte<T, 1> : public SwapByteBase
        {
            public:
                static T Swap(T v)
                {
                    return v;
                }
        };

    template <class T>
        class SwapByte<T, 2> : public SwapByteBase
        {
            public:
                static T Swap(T v)
                {
                    if(ShouldSwap())
                        return ((uint16_t)v >> 8) | ((uint16_t)v << 8);
                    return v;
                }
        };

    template <class T>
        class SwapByte<T, 4> : public SwapByteBase
        {
            public:
                static T Swap(T v)
                {
                    if(ShouldSwap())
                    {
                        return (SwapByte<uint16_t, 2>::Swap((uint32_t)v & 0xffff) << 16) | (SwapByte<uint16_t, 2>::Swap(((uint32_t)v & 0xffff0000) >> 16));
                    }
                    return v;
                }
        };

    template <class T>
        class SwapByte<T, 8> : public SwapByteBase
        {
            public:
                static T Swap(T v)
                {
                    if(ShouldSwap())
                        return (((uint64_t)SwapByte<uint32_t, 4>::Swap((uint32_t)(v & 0xffffffffull))) << 32) | (SwapByte<uint32_t, 4>::Swap((uint32_t)(v >> 32)));
                    return v;
                }
        };

    template <>
        class SwapByte<float, 4> : public SwapByteBase
        {
            public:
                static float Swap(float v)
                {
                    union { float f; uint8_t c[4]; };
                    f = v;
                    if(ShouldSwap())
                    {
                        SwapBytes(c[0], c[3]);
                        SwapBytes(c[1], c[2]);
                    }
                    return f;
                }
        };

    template <>
        class SwapByte<double, 8> : public SwapByteBase
        {
            public:
                static double Swap(double v)
                {
                    union { double f; uint8_t c[8]; };
                    f = v;
                    if(ShouldSwap())
                    {
                        SwapBytes(c[0], c[7]);
                        SwapBytes(c[1], c[6]);
                        SwapBytes(c[2], c[5]);
                        SwapBytes(c[3], c[4]);
                    }
                    return f;
                }
        };
}

template <class STREAM_TYPE>
class Archive
{
    public:
        Archive(STREAM_TYPE& stream) : m_stream(stream)
        {
        }

    public:
        template <class T>
            const Archive& operator<<(const T& v) const
            {
                *this & v;
                return *this;
            }

        template <class T>
            Archive& operator>>(T& v)
            {
                *this & v;
                return *this;
            }

    public:
        template <class T>
            Archive& operator&(T& v)
            {
                v.Serialize(*this);
                return *this;
            }

        template <class T>
            const Archive& operator&(const T& v) const
            {
                ((T&)v).Serialize(*this);
                return *this;
            }

        template <class T, size_t N>
            Archive& operator&(T (&v)[N])
            {
                uint32_t len;
                *this & len;
                for(size_t i = 0; i < N; ++i)
                    *this & v[i];
                return *this;
            }

        template <class T, size_t N>
            const Archive& operator&(const T (&v)[N]) const
            {
                uint32_t len = N;
                *this & len;
                for(size_t i = 0; i < N; ++i)
                    *this & v[i];
                return *this;
            }

#define SERIALIZER_FOR_POD(type) \
        Archive& operator&(type& v) \
        { \
            m_stream.read((char*)&v, sizeof(type)); \
            if(!m_stream) { throw std::runtime_error("malformed data"); } \
            v = Swap(v); \
            return *this; \
        } \
        const Archive& operator&(type v) const \
        { \
            v = Swap(v); \
            m_stream.write((const char*)&v, sizeof(type)); \
            return *this; \
        } 

        SERIALIZER_FOR_POD(bool)
        SERIALIZER_FOR_POD(char)
        SERIALIZER_FOR_POD(unsigned char)
        SERIALIZER_FOR_POD(short)
        SERIALIZER_FOR_POD(unsigned short)
        SERIALIZER_FOR_POD(int)
        SERIALIZER_FOR_POD(unsigned int)
        SERIALIZER_FOR_POD(long)
        SERIALIZER_FOR_POD(unsigned long)
        SERIALIZER_FOR_POD(long long)
        SERIALIZER_FOR_POD(unsigned long long)
        SERIALIZER_FOR_POD(float)
        SERIALIZER_FOR_POD(double)


#define SERIALIZER_FOR_STL(type) \
        template <class T> \
        Archive& operator&(type<T>& v) \
        { \
            uint32_t len; \
            *this & len; \
            for(uint32_t i = 0; i < len; ++i) \
            { \
                T value; \
                *this & value; \
                v.insert(v.end(), value); \
            } \
            return *this; \
        } \
        template <class T> \
        const Archive& operator&(const type<T>& v) const \
        { \
            uint32_t len = v.size(); \
            *this & len; \
            for(typename type<T>::const_iterator it = v.begin(); it != v.end(); ++it) \
            *this & *it; \
            return *this; \
        }

#define SERIALIZER_FOR_STL2(type) \
        template <class T1, class T2> \
        Archive& operator&(type<T1, T2>& v) \
        { \
            uint32_t len; \
            *this & len; \
            for(uint32_t i = 0; i < len; ++i) \
            { \
                std::pair<T1, T2> value; \
                *this & value; \
                v.insert(v.end(), value); \
            } \
            return *this; \
        } \
        template <class T1, class T2> \
        const Archive& operator&(const type<T1, T2>& v) const \
        { \
            uint32_t len = v.size(); \
            *this & len; \
            for(typename type<T1, T2>::const_iterator it = v.begin(); it != v.end(); ++it) \
            *this & *it; \
            return *this; \
        }

        SERIALIZER_FOR_STL(std::vector)
        SERIALIZER_FOR_STL(std::deque)
        SERIALIZER_FOR_STL(std::list)
        SERIALIZER_FOR_STL(std::set)
        SERIALIZER_FOR_STL(std::multiset)
        SERIALIZER_FOR_STL2(std::map)
        SERIALIZER_FOR_STL2(std::multimap)

        template <class T1, class T2>
            Archive& operator&(std::pair<T1, T2>& v)
            {
                *this & v.first & v.second;
                return *this;
            }

        template <class T1, class T2>
            const Archive& operator&(const std::pair<T1, T2>& v) const
            {
                *this & v.first & v.second;
                return *this;
            }

        Archive& operator&(std::string& v)
        {
            uint32_t len;
            *this & len;
            v.clear();
            char buffer[4096];
            uint32_t toRead = len;
            while(toRead != 0)
            {
                                uint32_t l;
                                
#if defined(_MSC_VER)
                l = min(toRead, (uint32_t)sizeof(buffer));
#else
                l = std::min(toRead, (uint32_t)sizeof(buffer));
#endif
                m_stream.read(buffer, l);
                if(!m_stream)
                    throw std::runtime_error("malformed data");
                v += std::string(buffer, l);
                toRead -= l;
            }
            return *this;
        }

        const Archive& operator&(const std::string& v) const
        {
            uint32_t len = v.length();
            *this & len;
            m_stream.write(v.c_str(), len);
            return *this;
        }

    private:
        template <class T>
            T Swap(const T& v) const
            {
                return EndianSwapper::SwapByte<T, sizeof(T)>::Swap(v);
            }

    private:
        STREAM_TYPE& m_stream;
};

#endif // ARCHIVE_H__