struc

struc is a C++11 implementation of python's struct module. It depends only of the Boost.Endian header only library and the math library.

Usage

struc is header only. You can just drop the struc.hpp wherever you like. Or you can add this repository as a git submodule and include it via CMake's add_subdirectory command. struc needs the math library so if you do not use struc with CMake's add_subdirectory, you need to link the math library to the final build artifact.

Example

#include <iostream>
#include "struc.hpp"

int main(int argc, char** argv)
{
   auto data = struc::pack(std::string("hhl"), 1, 2, 3);
   short h1, h2;
   long l1;
   struc::unpack("hhl", &data[0], h1, h2, l1);
   std::cout << h1 << std::endl;
   std::cout << h2 << std::endl;
   std::cout << l1 << std::endl;
   return 0;
}

output:

1
2
3

#include <iostream>
#include "struc.hpp"

int main(int argc, char** argv)
{
   std::string record("raymond   \x32\x12\x08\x01\x08");
   std::string name;
   unsigned short serialnum, school;
   char gradelevel;
   struc::unpack(std::string("<10sHHb"), record.c_str(), name, serialnum, school, gradelevel);
   std::cout << name << std::endl;
   std::cout << serialnum << std::endl;
   std::cout << school << std::endl;
   std::cout << (int)gradelevel << std::endl;
   return 0;
}

output:

raymond
4658
264
8

#include <iostream>
#include <iomanip>
#include "struc.hpp"

int main(int argc, char** argv)
{
   std::cout << struc::calcsize("ci") << std::endl;
   auto data = struc::pack(std::string("ci"), '*', 0x12131415);
   std::cout << "0x" << std::hex;
   for (const auto& c : data)
   {
      std::cout << std::setw(2) << std::setfill('0') << (int)(unsigned char)c;
   }
   std::cout << std::endl;
   std::cout << struc::calcsize("ic") << std::endl;
   data = struc::pack(std::string("ic"), 0x12131415, '*');
   std::cout << "0x" << std::hex;
   for (const auto& c : data)
   {
      std::cout << std::setw(2) << std::setfill('0') << (int)(unsigned char)c;
   }
   std::cout << std::endl;
   return 0;
}

output:

8
0x2a00000015141312
5
0x151413122a

#include <iostream>
#include <iomanip>
#include "struc.hpp"

int main(int argc, char** argv)
{
   std::cout << struc::calcsize("iih0i") << std::endl;
   auto data = struc::pack(std::string("iih0i"), 1, 2, 3);
   std::cout << "0x" << std::hex;
   for (const auto& c : data)
   {
      std::cout << std::setw(2) << std::setfill('0') << (int)(unsigned char)c;
   }
   std::cout << std::endl;
   return 0;
}

output:

12
0x010000000200000003000000