struct foo
{
int type;
size_t length;
};
// To allocate the struct
struct foo *bar = malloc(sizeof(foo) + theBytesINeed);
// To memcpy the data out of it:
void *buffer = ...;
memcpy(buffer, bar + 1, bar->length);
The code should be self explanatory. When sending, just append the extra bytes to the size of the struct, like the call of malloc() does.
