- /* Read overlapping B/C/D and over-reading */
- BOOST_CHECK_EQUAL (fg.read (test, total_length * 3), total_length - pos);
- BOOST_CHECK_EQUAL (memcmp (data + pos, test, total_length - pos), 0);
-
- /* Bad seek */
- BOOST_CHECK_EQUAL (fg.seek (total_length * 2, SEEK_SET), -1);
+ /* Read overlapping B/C/D and over-reading by a lot */
+ BOOST_CHECK_EQUAL (fg.read(test, total_length * 3), total_length - pos);
+ BOOST_CHECK_EQUAL (memcmp(data + pos, test, total_length - pos), 0);
+
+ /* Over-read by a little */
+ BOOST_CHECK_EQUAL (fg.seek(0, SEEK_SET), 0);
+ BOOST_CHECK_EQUAL (fg.read(test, total_length), total_length);
+ BOOST_CHECK_EQUAL (fg.read(test, 1), 0);
+
+ /* Seeking off the end of the file should not give an error */
+ BOOST_CHECK_EQUAL (fg.seek(total_length * 2, SEEK_SET), total_length * 2);
+ /* and attempting to read should return nothing */
+ BOOST_CHECK_EQUAL (fg.read(test, 64), 0);
+ /* but the requested seek should be remembered, so if we now go back (relatively) */
+ BOOST_CHECK_EQUAL (fg.seek(-total_length * 2, SEEK_CUR), 0);
+ /* we should be at the start again */
+ BOOST_CHECK_EQUAL (fg.read(test, 64), 64);
+ BOOST_CHECK_EQUAL (memcmp(data, test, 64), 0);