From 539816b0704ccddaaba1f392370533fc9d4310a4 Mon Sep 17 00:00:00 2001
From: lumenthi <lumenthi@student.42.fr>
Date: Fri, 25 Nov 2022 17:54:27 +0100
Subject: [PATCH] :sparkles: Add ft_swap, ft_ntohs implementation

---
 headers/malcolm.h |  2 ++
 libft/Makefile    |  5 +++--
 libft/ft_swap.c   | 28 ++++++++++++++++++++++++++++
 libft/libft.h     |  4 +++-
 sources/main.c    | 15 ++++++++++-----
 5 files changed, 46 insertions(+), 8 deletions(-)
 create mode 100644 libft/ft_swap.c

diff --git a/headers/malcolm.h b/headers/malcolm.h
index 37c2a73..207149c 100644
--- a/headers/malcolm.h
+++ b/headers/malcolm.h
@@ -1,6 +1,8 @@
 #ifndef MALCOLM_H
 # define MALCOLM_H
 
+#include "libft.h"
+
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <linux/if_ether.h>
diff --git a/libft/Makefile b/libft/Makefile
index 9c11081..5dbb20e 100644
--- a/libft/Makefile
+++ b/libft/Makefile
@@ -6,7 +6,7 @@
 #    By: lumenthi <lumenthi@student.42.fr>          +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2018/01/04 10:37:11 by lumenthi          #+#    #+#              #
-#    Updated: 2022/10/11 11:10:04 by lumenthi         ###   ########.fr        #
+#    Updated: 2022/11/25 17:41:20 by lumenthi         ###   ########.fr        #
 #                                                                              #
 # **************************************************************************** #
 
@@ -117,7 +117,8 @@ SRCS = ft_atoi.c \
 		ft_strjoin_free.c \
 		ft_rmchar.c \
 		time_utils.c \
-		ft_abs.c 
+		ft_abs.c \
+		ft_swap.c
 
 OBJDIR = objs
 OBJS = $(addprefix $(OBJDIR)/, $(SRCS:.c=.o))
diff --git a/libft/ft_swap.c b/libft/ft_swap.c
new file mode 100644
index 0000000..76184a4
--- /dev/null
+++ b/libft/ft_swap.c
@@ -0,0 +1,28 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_swap.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lumenthi <lumenthi@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/02/10 12:01:16 by lumenthi          #+#    #+#             */
+/*   Updated: 2022/11/25 17:45:11 by lumenthi         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+uint16_t	swap_uint16(uint16_t nb)
+{
+	nb = (nb << 8) | (nb >> 8);
+	return (nb);
+}
+
+uint32_t	swap_uint32(uint32_t nb)
+{
+	nb = ((nb & 0x000000FF) << 24 |
+				(nb & 0x0000FF00) << 8 |
+				(nb & 0x00FF0000) >> 8 |
+				(nb & 0xFF000000) >> 24);
+	return (nb);
+}
diff --git a/libft/libft.h b/libft/libft.h
index 7790094..9f4bf7b 100644
--- a/libft/libft.h
+++ b/libft/libft.h
@@ -6,7 +6,7 @@
 /*   By: lumenthi <lumenthi@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2017/11/11 10:50:56 by lumenthi          #+#    #+#             */
-/*   Updated: 2022/10/11 11:10:36 by lumenthi         ###   ########.fr       */
+/*   Updated: 2022/11/25 17:45:30 by lumenthi         ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -121,5 +121,7 @@ uint64_t		get_time(void);
 int				ft_abs(int nb);
 long			ft_labs(long nb);
 long long		ft_llabs(long long nb);
+uint16_t		swap_uint16(uint16_t nb);
+uint32_t		swap_uint32(uint32_t nb);
 
 #endif
diff --git a/sources/main.c b/sources/main.c
index 63296cf..c09f4c0 100644
--- a/sources/main.c
+++ b/sources/main.c
@@ -1,5 +1,10 @@
 #include "malcolm.h"
 
+uint16_t ft_ntohs(uint16_t netshort)
+{
+	return swap_uint16(netshort);
+}
+
 void print_ip(uint8_t *ip_address)
 {
 	int i = 0;
@@ -30,11 +35,11 @@ void debug_arp(struct arp_hdr *arp)
 
 	/* Type informations */
 	printf("Hardware type: %s\n",
-		(ntohs(arp->hrd) == HARDWARE_ETHERNET) ? "Ethernet" : "Unknown");
+		(ft_ntohs(arp->hrd) == HARDWARE_ETHERNET) ? "Ethernet" : "Unknown");
 	printf("Protocol type: %s\n",
-		(ntohs(arp->pro) == ETH_P_IP) ? "IPv4" : "Unknown");
+		(ft_ntohs(arp->pro) == ETH_P_IP) ? "IPv4" : "Unknown");
 	printf("Operation: %s\n",
-		(ntohs(arp->op) == ARP_REQUEST) ? "ARP Request" : "ARP Reply");
+		(ft_ntohs(arp->op) == ARP_REQUEST) ? "ARP Request" : "ARP Reply");
 
 	/* Addresses informations */
 	/* Sender */
@@ -60,7 +65,7 @@ void debug_eth(struct ethernet_hdr *ethernet)
 
 	/* Type */
 	printf("Ethernet type: %s\n",
-		(ntohs(ethernet->type) == ETH_P_ARP) ? "ARP" : "Other");
+		(ft_ntohs(ethernet->type) == ETH_P_ARP) ? "ARP" : "Other");
 
 	/* Addresses informations */
 	/* Sender */
@@ -83,7 +88,7 @@ void debug_packet(char *buffer)
 	ethernet = (struct ethernet_hdr *)buffer;
 	arp = (struct arp_hdr *)(buffer + sizeof(struct ethernet_hdr));
 
-	type = ntohs(ethernet->type);
+	type = ft_ntohs(ethernet->type);
 
 	if (type == ETH_P_ARP) {
 		printf("\n");