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  1. #include <cstdint>
  2. #include <cstring>
  3. #include <iostream>
  4. #include <tuple>
  5. #include <type_traits>
  6.  
  7. class Serializer
  8. {
  9. public:
  10.     explicit Serializer(unsigned int buffer_size=255) : _cursor_end(0),_cursor_begin(0), _buffer_size(buffer_size)
  11.     {
  12.         _buffer = new unsigned char[buffer_size];
  13.     };
  14.     ~Serializer(){
  15.         delete _buffer;
  16.     }
  17.  
  18.     Serializer& operator<<(int i){
  19.         push(*reinterpret_cast<uint32_t*>(&i));
  20.         return *this;
  21.  
  22.     };
  23.  
  24.     Serializer& operator>>(int& i){
  25.         pop(*reinterpret_cast<uint32_t*>(&i));
  26.         return *this;
  27.     };
  28.  
  29. protected:
  30.  
  31.     unsigned char* _buffer;
  32.     unsigned int _cursor_end;
  33.     unsigned int _cursor_begin;
  34.     unsigned int _buffer_size;
  35.  
  36.     inline void resize(const unsigned int buffer_cursor_end){
  37.         unsigned char* buffer = new unsigned char[buffer_cursor_end];
  38.         buffer = (unsigned char*)memcpy(buffer,_buffer,_buffer_size);
  39.  
  40.         delete _buffer;
  41.         _buffer = buffer;
  42.         _buffer_size = buffer_cursor_end;
  43.     };
  44.  
  45.     inline void push(uint32_t& a){
  46.         if(_buffer_size < _cursor_end + 4)
  47.         resize(_buffer_size+128);
  48.  
  49.         uint8_t *d = (uint8_t *)&a;
  50.  
  51.         #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  52.         _buffer[_cursor_end++] = d[0];
  53.         _buffer[_cursor_end++] = d[1];
  54.         _buffer[_cursor_end++] = d[2];
  55.         _buffer[_cursor_end++] = d[3];
  56.         #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  57.         _buffer[_cursor_end++] = d[3];
  58.         _buffer[_cursor_end++] = d[2];
  59.         _buffer[_cursor_end++] = d[1];
  60.         _buffer[_cursor_end++] = d[0];
  61.         #else
  62.         #error "byte orden not suported (PDP endian)"
  63.         #endif
  64.  
  65.     }
  66.  
  67.     inline void pop(uint32_t& a){
  68.         if(_cursor_begin +4 <= _cursor_end)
  69.         {
  70.             uint8_t *d = (uint8_t *)&a;
  71.             #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  72.             d[0]= _buffer[_cursor_begin++];
  73.             d[1]= _buffer[_cursor_begin++];
  74.             d[2]= _buffer[_cursor_begin++];
  75.             d[3]= _buffer[_cursor_begin++];
  76.             #elif __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
  77.             d[3]= _buffer[_cursor_begin++];
  78.             d[2]= _buffer[_cursor_begin++];
  79.             d[1]= _buffer[_cursor_begin++];
  80.             d[0]= _buffer[_cursor_begin++];
  81.             #else
  82.             #error "byte orden not suported (PDP endian)"
  83.             #endif
  84.         }
  85.     };
  86. };
  87.  
  88. template<typename T, T...>
  89. struct integer_sequence
  90. { };
  91.  
  92. template<std::size_t... Indices>
  93. struct indices : integer_sequence<std::size_t, Indices...>
  94. { };
  95.  
  96. template<std::size_t N, std::size_t... T>
  97. struct build_indices : build_indices<(N - 1), (N - 1), T...>
  98. { };
  99.  
  100. template<std::size_t... T>
  101. struct build_indices<0, T...> : indices<T...>
  102. { };
  103.  
  104. template<typename Fn, typename... Args, std::size_t... Idx>
  105. auto exec__(Fn fn, Serializer& ser, std::tuple<Args...> args, indices<Idx...>)
  106. -> decltype(fn(ser, std::get<Idx>(args)...))
  107. {
  108. 	int ctx[] = { ((ser >> std::get<Idx>(args)), void(), 0)... };
  109. 	(void)ctx;
  110. 	return fn(ser, std::get<Idx>(args)...);
  111. }
  112.  
  113. template<typename R, typename... Args>
  114. auto exec(R(*fn)(Serializer&, Args...), Serializer& ser)
  115. -> decltype(fn(ser, Args()...))
  116. {
  117. 	return exec__(fn, ser, std::tuple<typename std::remove_reference<Args>::type...>(), build_indices<sizeof...(Args)>());
  118. }
  119.  
  120. int getVersion(Serializer& sock)
  121. {
  122.     return 42;
  123. }
  124.  
  125. int testParamInt(Serializer& sock, int v)
  126. {
  127.     std::cout << "param:" << v << std::endl;
  128.     return v + 12;
  129. }
  130.  
  131. int main() {
  132. 	{
  133.         Serializer params;
  134.         std::cout << "getVersion : " << exec(&getVersion, params) << std::endl;;
  135.     }
  136.  
  137.     {
  138.         Serializer params;
  139.         params << 35;
  140.         /*int p1;
  141.         params >> p1;*/
  142.         std::cout << "testParamInt: " << exec(&testParamInt, params) << std::endl;
  143.     }
  144.    return 0;
  145. }
  146.  
Success #stdin #stdout 0s 3428KB
comments (?)
stdin 
Standard input is empty
stdout 
getVersion : 42
param:35
testParamInt: 47
https://ideone.com/IvAL2i
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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