gistfile1.cpp

typedef struct IPv4Header
{
    u_int8_t versionAndHeaderLength;
    u_int8_t differentiatedServices; 
    u_int16_t totalLength;
    u_int16_t identification;
    u_int16_t fragmentOffset;
    u_int8_t timeToLive; 
    u_int8_t protocol;
    u_int16_t checksum;
    struct in_addr source, destination;
} IPv4Header;

uint8_t buffer[HeaderSize];

mHeader = *((IPv4Header*) buffer); // uint8_t to IPv4Header
*((IPv4Header*) buffer) = mHeader; // IPv4Header to uint8_t