/* Test that data values are written and read with proper alignment. */
static void
test_alignment(void)
{
void *ctx = ralloc_context(NULL);
struct blob *blob;
struct blob_reader reader;
uint8_t bytes[] = "ABCDEFGHIJKLMNOP";
size_t delta, last, num_bytes;
blob = blob_create(ctx);
/* First, write an intptr value to the blob and capture that size. This is
* the expected offset between any pair of intptr values (if written with
* alignment).
*/
blob_write_intptr(blob, (intptr_t) blob);
delta = blob->size;
last = blob->size;
/* Then loop doing the following:
*
* 1. Write an unaligned number of bytes
* 2. Verify that write results in an unaligned size
* 3. Write an intptr_t value
* 2. Verify that that write results in an aligned size
*/
for (num_bytes = 1; num_bytes < sizeof(intptr_t); num_bytes++) {
blob_write_bytes(blob, bytes, num_bytes);
expect_unequal(delta, blob->size - last, "unaligned write of bytes");
blob_write_intptr(blob, (intptr_t) blob);
expect_equal(2 * delta, blob->size - last, "aligned write of intptr");
last = blob->size;
}
/* Finally, test that reading also does proper alignment. Since we know
* that values were written with all the right alignment, all we have to do
* here is verify that correct values are read.
*/
blob_reader_init(&reader, blob->data, blob->size);
expect_equal((intptr_t) blob, blob_read_intptr(&reader),
"read of initial, aligned intptr_t");
for (num_bytes = 1; num_bytes < sizeof(intptr_t); num_bytes++) {
expect_equal_bytes(bytes, blob_read_bytes(&reader, num_bytes),
num_bytes, "unaligned read of bytes");
expect_equal((intptr_t) blob, blob_read_intptr(&reader),
"aligned read of intptr_t");
}
ralloc_free(ctx);
}
/* Test at least one call of each blob_write_foo and blob_read_foo function,
* verifying that we read out everything we wrote, that every bytes is
* consumed, and that the overrun bit is not set.
*/
static void
test_write_and_read_functions (void)
{
struct blob blob;
struct blob_reader reader;
ssize_t reserved;
size_t str_offset, uint_offset;
uint8_t reserve_buf[sizeof(reserve_test_str)];
blob_init(&blob);
/*** Test blob by writing one of every possible kind of value. */
blob_write_bytes(&blob, bytes_test_str, sizeof(bytes_test_str));
reserved = blob_reserve_bytes(&blob, sizeof(reserve_test_str));
blob_overwrite_bytes(&blob, reserved, reserve_test_str, sizeof(reserve_test_str));
/* Write a placeholder, (to be replaced later via overwrite_bytes) */
str_offset = blob.size;
blob_write_bytes(&blob, placeholder_str, sizeof(placeholder_str));
blob_write_uint32(&blob, uint32_test);
/* Write a placeholder, (to be replaced later via overwrite_uint32) */
uint_offset = blob.size;
blob_write_uint32(&blob, uint32_placeholder);
blob_write_uint64(&blob, uint64_test);
blob_write_intptr(&blob, (intptr_t) &blob);
blob_write_string(&blob, string_test_str);
/* Finally, overwrite our placeholders. */
blob_overwrite_bytes(&blob, str_offset, overwrite_test_str,
sizeof(overwrite_test_str));
blob_overwrite_uint32(&blob, uint_offset, uint32_overwrite);
/*** Now read each value and verify. */
blob_reader_init(&reader, blob.data, blob.size);
expect_equal_str(bytes_test_str,
blob_read_bytes(&reader, sizeof(bytes_test_str)),
"blob_write/read_bytes");
blob_copy_bytes(&reader, reserve_buf, sizeof(reserve_buf));
expect_equal_str(reserve_test_str, (char *) reserve_buf,
"blob_reserve_bytes/blob_copy_bytes");
expect_equal_str(overwrite_test_str,
blob_read_bytes(&reader, sizeof(overwrite_test_str)),
"blob_overwrite_bytes");
expect_equal(uint32_test, blob_read_uint32(&reader),
"blob_write/read_uint32");
expect_equal(uint32_overwrite, blob_read_uint32(&reader),
"blob_overwrite_uint32");
expect_equal(uint64_test, blob_read_uint64(&reader),
"blob_write/read_uint64");
expect_equal((intptr_t) &blob, blob_read_intptr(&reader),
"blob_write/read_intptr");
expect_equal_str(string_test_str, blob_read_string(&reader),
"blob_write/read_string");
expect_equal(reader.end - reader.data, reader.current - reader.data,
"read_consumes_all_bytes");
expect_equal(false, reader.overrun, "read_does_not_overrun");
blob_finish(&blob);
}
static void *
read_object(read_ctx *ctx)
{
return read_lookup_object(ctx, blob_read_intptr(ctx->blob));
}
