Merge pull request #765 from TsudaKageyu/zero-length-atom

Proper handling of MP4 atoms with zero length.

diff --cc tests/test_mp4.cpp
index ebfb4baba93e58031375cced1f30373b0c56cc09,bc0ac01d7f41585d6a201d4905aa4297cbfcab77..c8d657234aa460f92962e6804342434d0972b6af
--- 1/tests/test_mp4.cpp
--- 2/tests/test_mp4.cpp
+++ b/tests/test_mp4.cpp
@@@ -55,9 -55,9 +55,10 @@@ class TestMP4 : public CppUnit::TestFix
    CPPUNIT_TEST(testCovrWrite);
    CPPUNIT_TEST(testCovrRead2);
    CPPUNIT_TEST(testProperties);
 +  CPPUNIT_TEST(testPropertiesMovement);
    CPPUNIT_TEST(testFuzzedFile);
    CPPUNIT_TEST(testRepeatedSave);
+   CPPUNIT_TEST(testWithZeroLengthAtom);
    CPPUNIT_TEST_SUITE_END();
  
  public: