unit-tests: Fix internet checksum tests on big-endian systems

We actually need to do a byte-swap, which ntohs() only does on
little-endian systems.

Fixes #747.

diff --git a/src/libstrongswan/tests/suites/test_chunk.c b/src/libstrongswan/tests/suites/test_chunk.c
index d71e010a2dd988a75fadc5cf3b03e1e4bb182ab2..b5d23658da926782ed59a9d1ad0f63f0530fa314 100644 (file)
--- a/src/libstrongswan/tests/suites/test_chunk.c
+++ b/src/libstrongswan/tests/suites/test_chunk.c
@@ -787,6 +787,11 @@ END_TEST
  * test for chunk_internet_checksum[_inc]()
  */
 
+static inline u_int16_t compensate_alignment(u_int16_t val)
+{
+       return ((val & 0xff) << 8) | (val >> 8);
+}
+
 START_TEST(test_chunk_internet_checksum)
 {
        chunk_t chunk;
@@ -804,9 +809,9 @@ START_TEST(test_chunk_internet_checksum)
 
        /* need to compensate for even/odd alignment */
        sum = chunk_internet_checksum(chunk_create(chunk.ptr, 9));
-       sum = ntohs(sum);
+       sum = compensate_alignment(sum);
        sum = chunk_internet_checksum_inc(chunk_create(chunk.ptr+9, 11), sum);
-       sum = ntohs(sum);
+       sum = compensate_alignment(sum);
        ck_assert_int_eq(0x442e, ntohs(sum));
 
        chunk = chunk_from_chars(0x45,0x00,0x00,0x30,0x44,0x22,0x40,0x00,0x80,0x06,
@@ -821,9 +826,9 @@ START_TEST(test_chunk_internet_checksum)
 
        /* need to compensate for even/odd alignment */
        sum = chunk_internet_checksum(chunk_create(chunk.ptr, 9));
-       sum = ntohs(sum);
+       sum = compensate_alignment(sum);
        sum = chunk_internet_checksum_inc(chunk_create(chunk.ptr+9, 10), sum);
-       sum = ntohs(sum);
+       sum = compensate_alignment(sum);
        ck_assert_int_eq(0x4459, ntohs(sum));
 }
 END_TEST