utils.h

#ifndef UTILS_H
#define UTILS_H

#include "includes.h"

namespace utils {
    int16 endian16(int16 data){
        int8 l, h;
        h = (data & 0xff00) >> 8;
        l = (data & 0x00ff);
        return (int16)(l << 8) | h;
    }

    int16 checksum(int8* buffer, int16 size){
        int32 acc = 0;
        int16* i;

        for(i = (int16 *)buffer; size > 1; size-=2, ++i) 
            acc+=(int32)(*i);

        if(size == 1) acc += ((int32)*((int8 *)i)) << 8;

        int16 sum = (acc & 0x0000ffff);
        int16 carry = ((acc & 0xffff0000) >> 16);
        return (~(sum + carry));
    }

    vector<int8> getStringToByteVector(string s){
        return vector<int8>(s.begin(), s.end());
    }

    string convertIpToString(int32 ip){
        int8 o1 = (ip >> 24) & 0xff;
        int8 o2 = (ip >> 16) & 0xff;
        int8 o3 = (ip >> 8) & 0xff;
        int8 o4 = ip & 0xff;

        ostringstream oss;
        oss<<(int32)o1<<'.'<<(int32)o2<<'.'<<(int32)o3<<'.'<<(int32)o4;
        return oss.str();
    }

    void copy_data(int8* src_data, int8* dest_data, int16 size){
        int8 *src_ptr, *dest_ptr;
        for(src_ptr=src_data, dest_ptr=dest_data; size!=0; --size,++src_ptr,++dest_ptr) 
            *dest_ptr = *src_ptr;
    }

    void printhex(const int8* data, size_t size, int indent = 0)
    {
        for (size_t i = 0; i < size; ++i) {
            if (i % 16 == 0) {
                cout << "\n";
                for (int j = 0; j < indent; ++j) cout << ' ';
            }
            cout << hex << setw(2) << setfill('0') << (int)data[i] << " ";
        }
        cout << dec << "\n";
    }
}

#endif