From 9b0a0ba9e671d9134b93c33ab73ccccb352acafa Mon Sep 17 00:00:00 2001
From: "Ondrej Zajicek (work)" <santiago@crfreenet.org>
Date: Wed, 9 Nov 2016 16:36:34 +0100
Subject:   Unit Testing for BIRD

 - Unit Testing Framework (BirdTest)
 - Integration of BirdTest into the BIRD build system
 - Tests for several BIRD modules

 Based on squashed Pavel Tvrdik's int-test branch, updated for
 current int-new branch.
---
 lib/checksum_test.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 lib/checksum_test.c

(limited to 'lib/checksum_test.c')

diff --git a/lib/checksum_test.c b/lib/checksum_test.c
new file mode 100644
index 00000000..ae5a7f31
--- /dev/null
+++ b/lib/checksum_test.c
@@ -0,0 +1,94 @@
+/*
+ *	BIRD Library -- IP One-Complement Checksum Tests
+ *
+ *	(c) 2015 CZ.NIC z.s.p.o.
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include <stdio.h>
+
+#include "test/birdtest.h"
+
+#include "lib/checksum.h"
+
+#define MAX_NUM 10000
+
+static u16
+ipsum_calculate_expected(u32 *a)
+{
+  int i;
+  u32 sum = 0;
+
+  for(i = 0; i < MAX_NUM; i++)
+  {
+    sum += a[i] & 0xffff;
+    bt_debug("low) \t0x%08X \n", sum);
+
+    sum += a[i] >> 16;
+    bt_debug("high) \t0x%08X \n", sum);
+
+    u16 carry = sum >> 16;
+    sum = (sum & 0xffff) + carry;
+    bt_debug("carry) \t0x%08X \n\n", sum);
+  }
+  bt_debug("sum) \t0x%08X \n", sum);
+
+  sum = sum ^ 0xffff;
+  bt_debug("~sum) \t0x%08X \n", sum);
+
+  return sum;
+}
+
+static int
+t_calculate(void)
+{
+  u32 a[MAX_NUM];
+  int i;
+
+  for (i = 0; i < MAX_NUM; i++)
+    a[i] = bt_random();
+
+  u16 sum_calculated   = ipsum_calculate(a, sizeof(a), NULL);
+  u16 sum_calculated_2 = ipsum_calculate(&a[0], sizeof(u32)*(MAX_NUM/2), &a[MAX_NUM/2], sizeof(u32)*(MAX_NUM - MAX_NUM/2), NULL);
+  bt_assert(sum_calculated == sum_calculated_2);
+
+  u16 sum_expected = ipsum_calculate_expected(a);
+
+  bt_debug("sum_calculated: %08X \n", sum_calculated);
+  bt_debug("sum_expected:   %08X \n", sum_expected);
+
+  bt_assert(sum_calculated == sum_expected);
+
+  return BT_SUCCESS;
+}
+
+static int
+t_verify(void)
+{
+  u32 a[MAX_NUM+1];
+  int i;
+
+  for (i = 0; i < MAX_NUM; i++)
+    a[i] = bt_random();
+
+  u16 sum = ipsum_calculate_expected(a);
+
+  a[MAX_NUM] = sum;
+
+  bt_assert(ipsum_verify(a, sizeof(a), NULL));
+
+  return BT_SUCCESS;
+}
+
+
+int
+main(int argc, char *argv[])
+{
+  bt_init(argc, argv);
+
+  bt_test_suite(t_calculate, "Checksum of pseudo-random data");
+  bt_test_suite(t_verify, "Verification of pseudo-random data.");
+
+  return bt_exit_value();
+}
-- 
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