1 files changed, 169 insertions, 0 deletions
diff --git a/lib/fletcher16_test.c b/lib/fletcher16_test.c
new file mode 100644
index 00000000..1020e6ec
--- /dev/null
+++ b/lib/fletcher16_test.c
@@ -0,0 +1,169 @@
+/*
+ *	BIRD Library -- Fletcher-16 Tests
+ *
+ *	(c) 2015 CZ.NIC z.s.p.o.
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+#include "test/birdtest.h"
+#include "lib/fletcher16.h"
+
+static u16
+straightforward_fletcher16_compute(const char *data)
+{
+  int count = strlen(data);
+
+  u16 sum1 = 0;
+  u16 sum2 = 0;
+  int index;
+
+  for (index = 0; index < count; ++index)
+  {
+    sum1 = (sum1 + data[index]) % 255;
+    sum2 = (sum2 + sum1) % 255;
+  }
+
+  return (sum2 << 8) | sum1;
+}
+
+static u16
+straightforward_fletcher16_checksum(const char *data)
+{
+  u16 csum;
+  u8 c0,c1,f0,f1;
+
+  csum = straightforward_fletcher16_compute(data);
+  f0 = csum & 0xff;
+  f1 = (csum >> 8) & 0xff;
+  c0 = 0xff - ((f0 + f1) % 0xff);
+  c1 = 0xff - ((f0 + c0) % 0xff);
+
+  return (c1 << 8) | c0;
+}
+
+static int
+test_fletcher16(void *out_, const void *in_, const void *expected_out_)
+{
+  u16 *out = out_;
+  const char *in = in_;
+  const u16 *expected_out = expected_out_;
+
+  struct fletcher16_context ctxt;
+
+  fletcher16_init(&ctxt);
+  fletcher16_update(&ctxt, in, strlen(in));
+  put_u16(out, fletcher16_compute(&ctxt));
+
+  return *out == *expected_out;
+}
+
+static int
+test_fletcher16_checksum(void *out_, const void *in_, const void *expected_out_)
+{
+  u16 *out = out_;
+  const char *in = in_;
+  const u16 *expected_out = expected_out_;
+
+  struct fletcher16_context ctxt;
+  int len = strlen(in);
+
+  fletcher16_init(&ctxt);
+  fletcher16_update(&ctxt, in, len);
+  put_u16(out, fletcher16_final(&ctxt, len, len));
+
+  return *out == *expected_out;
+}
+
+static int
+t_fletcher16_compute(void)
+{
+  struct bt_pair test_vectors[] = {
+    {
+      .in  = "\001\002",
+      .out = & (const u16) { 0x0403 },
+    },
+    {
+      .in  = "",
+      .out = & ((const u16) { straightforward_fletcher16_compute("") }),
+    },
+    {
+      .in  = "a",
+      .out = & ((const u16) { straightforward_fletcher16_compute("a") }),
+    },
+    {
+      .in  = "abcd",
+      .out = & ((const u16) { straightforward_fletcher16_compute("abcd") }),
+    },
+    {
+      .in  = "message digest",
+      .out = & ((const u16) { straightforward_fletcher16_compute("message digest") }),
+    },
+    {
+      .in  = "abcdefghijklmnopqrstuvwxyz",
+      .out = & ((const u16) { straightforward_fletcher16_compute("abcdefghijklmnopqrstuvwxyz") }),
+    },
+    {
+      .in  = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
+      .out = & ((const u16) { straightforward_fletcher16_compute("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") }),
+    },
+    {
+      .in  = "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
+      .out = & ((const u16) { straightforward_fletcher16_compute("12345678901234567890123456789012345678901234567890123456789012345678901234567890") }),
+    },
+  };
+
+  return bt_assert_batch(test_vectors, test_fletcher16, bt_fmt_str, bt_fmt_unsigned);
+}
+
+static int
+t_fletcher16_checksum(void)
+{
+  struct bt_pair test_vectors[] = {
+    {
+      .in  = "\001\002",
+      .out =  & ((const u16) { straightforward_fletcher16_checksum("\001\002") }),
+    },
+    {
+      .in  = "",
+      .out =  & ((const u16) { straightforward_fletcher16_checksum("") }),
+    },
+    {
+      .in  = "a",
+      .out =  & ((const u16) { straightforward_fletcher16_checksum("a") }),
+    },
+    {
+      .in  = "abcd",
+      .out =  & ((const u16) { straightforward_fletcher16_checksum("abcd") }),
+    },
+    {
+      .in  = "message digest",
+      .out =  & ((const u16) { straightforward_fletcher16_checksum("message digest") }),
+    },
+    {
+      .in  = "abcdefghijklmnopqrstuvwxyz",
+      .out =  & ((const u16) { straightforward_fletcher16_checksum("abcdefghijklmnopqrstuvwxyz") }),
+    },
+    {
+      .in  = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
+      .out =  & ((const u16) { straightforward_fletcher16_checksum("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") }),
+    },
+    {
+      .in  = "12345678901234567890123456789012345678901234567890123456789012345678901234567890",
+      .out =  & ((const u16) { straightforward_fletcher16_checksum("12345678901234567890123456789012345678901234567890123456789012345678901234567890") }),
+    },
+  };
+
+  return bt_assert_batch(test_vectors, test_fletcher16_checksum, bt_fmt_str, bt_fmt_unsigned);
+}
+
+int
+main(int argc, char *argv[])
+{
+  bt_init(argc, argv);
+
+  bt_test_suite(t_fletcher16_compute, "Fletcher-16 Compute Tests");
+  bt_test_suite(t_fletcher16_checksum, "Fletcher-16 Checksum Tests");
+
+  return bt_exit_value();
+}