From 133a564a7ba1f57ff229e7c181227d43b4bae584 Mon Sep 17 00:00:00 2001
From: Carlos Maiolino <cem@toxiclabs.cc>
Date: Sat, 6 Sep 2025 11:12:35 +0200
Subject: Create ecat based on a lib archive

Signed-off-by: Carlos Maiolino <cem@toxiclabs.cc>
---
 C/HF/chap8/src/ecat.c         | 29 +++++++++++++++++++++++++++++
 C/HF/chap8/src/libs/encrypt.c | 13 +++++++++++++
 C/HF/chap8/src/libs/xor.c     | 30 ++++++++++++++++++++++++++++++
 C/HF/chap8/src/message.c      | 13 +++++++++++++
 4 files changed, 85 insertions(+)
 create mode 100644 C/HF/chap8/src/ecat.c
 create mode 100644 C/HF/chap8/src/libs/encrypt.c
 create mode 100644 C/HF/chap8/src/libs/xor.c
 create mode 100644 C/HF/chap8/src/message.c

(limited to 'C/HF/chap8/src')

diff --git a/C/HF/chap8/src/ecat.c b/C/HF/chap8/src/ecat.c
new file mode 100644
index 0000000..9be8a47
--- /dev/null
+++ b/C/HF/chap8/src/ecat.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <libs/xor.h>
+#include <libs/encrypt.h>
+
+int main(int argc, char **argv)
+{
+	FILE *fd;
+	char buf[80];
+
+	char f = '\0';
+
+	encrypt_arr_t fn_arr = {xor16, xor42, xor64};
+	if (argc != 2)
+		return 1;
+
+	printf("Arr size: %ld\n", sizeof(fn_arr) / sizeof(*fn_arr));
+	fd = fopen(argv[1], "r");
+
+	while (fgets(buf, 80, fd)) {
+		encrypt_arr(buf, fn_arr, 3);
+		printf("encrypted message: '%s'", buf);
+	}
+
+	printf("\n");
+
+	printf("%c", (char)(f ^ 16 ^ 42 ^ 64));
+	fclose(fd);
+	return 0;
+}
diff --git a/C/HF/chap8/src/libs/encrypt.c b/C/HF/chap8/src/libs/encrypt.c
new file mode 100644
index 0000000..d894cfc
--- /dev/null
+++ b/C/HF/chap8/src/libs/encrypt.c
@@ -0,0 +1,13 @@
+#include <libs/encrypt.h>
+
+void encrypt(char *message, encrypt_fn_t encrypt_fn) {
+	encrypt_fn(message);
+}
+
+void encrypt_arr(char *message, encrypt_arr_t fn_arr, int size)
+{
+	int i;
+
+	for (i = 0; i < size; i++)
+		encrypt(message, fn_arr[i]);
+}
diff --git a/C/HF/chap8/src/libs/xor.c b/C/HF/chap8/src/libs/xor.c
new file mode 100644
index 0000000..30286e7
--- /dev/null
+++ b/C/HF/chap8/src/libs/xor.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <libs/xor.h>
+
+void xor16(char *message)
+{
+	printf("Orig: %s\n", message);
+	while (*message) {
+		*message = *message ^ 16;
+		message++;
+	}
+}
+
+void xor42(char *message)
+{
+	printf("Orig: %s\n", message);
+	while (*message) {
+		*message = *message ^ 42;
+		message++;
+	}
+}
+
+void xor64(char *message)
+{
+	printf("Orig: %s\n", message);
+	while (*message) {
+		*message = *message ^ 64;
+		message++;
+	}
+}
+
diff --git a/C/HF/chap8/src/message.c b/C/HF/chap8/src/message.c
new file mode 100644
index 0000000..345774c
--- /dev/null
+++ b/C/HF/chap8/src/message.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include "encrypt.h"
+
+int main(void)
+{
+	char msg[80];
+	while (fgets(msg, 80, stdin)) {
+		encrypt(msg);
+		printf("%s\n", msg);
+	}
+
+	return 0;
+}
-- 
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