endianess.c

#include "common.h"
 
uint8_t bit_flip_byte(uint8_t byte, int num_bits) {
    uint8_t x = byte << (8 - num_bits);
    return x | (byte >> num_bits);
}
 
uint16_t bit_flip_short(uint16_t short_int) {
    uint32_t first_byte = *((uint8_t*)(&short_int));
    uint32_t second_byte = *((uint8_t*)(&short_int) + 1);
    return (first_byte << 8) | (second_byte);
}
 
uint32_t bit_flip_int(uint32_t long_int) {
    uint32_t first_byte = *((uint8_t*)(&long_int));
    uint32_t second_byte = *((uint8_t*)(&long_int) + 1);
    uint32_t third_byte = *((uint8_t*)(&long_int)  + 2);
    uint32_t fourth_byte = *((uint8_t*)(&long_int) + 3);
    return (first_byte << 24) | (second_byte << 16) | (third_byte << 8) | (fourth_byte);
}
 
uint8_t htonb(uint8_t byte, int num_bits) {
    return bit_flip_byte(byte, num_bits);
}
 
uint8_t ntohb(uint8_t byte, int num_bits) {
    return bit_flip_byte(byte, 8 - num_bits);
}
 
uint16_t htons(uint16_t hostshort) {
    return bit_flip_short(hostshort);
}
 
uint32_t htonl(uint32_t hostlong) {
    return bit_flip_int(hostlong);
}
 
uint16_t ntohs(uint16_t netshort) {
    return bit_flip_short(netshort);
}
 
uint32_t ntohl(uint32_t netlong) {
    return bit_flip_int(netlong);
}