def test_version(self): """Test that the value for FileMetaInformationVersion is OK.""" meta = Dataset() meta.MediaStorageSOPClassUID = '1.1' meta.MediaStorageSOPInstanceUID = '1.2' meta.TransferSyntaxUID = '1.3' meta.ImplementationClassUID = '1.4' _write_file_meta_info(self.fp, meta) self.fp.seek(16 + 12) self.assertEqual(self.fp.read(2), b'\x00\x01')
def test_group_length(self): """Test that the value for FileMetaInformationGroupLength is OK.""" meta = Dataset() meta.MediaStorageSOPClassUID = '1.1' meta.MediaStorageSOPInstanceUID = '1.2' meta.TransferSyntaxUID = '1.3' meta.ImplementationClassUID = '1.4' _write_file_meta_info(self.fp, meta) # 78 in total, - 4 for prefix, - 12 for group length = 62 self.fp.seek(12) self.assertEqual(self.fp.read(4), b'\x3E\x00\x00\x00')
def test_prefix(self): """Test that the 'DICM' prefix is present.""" meta = Dataset() meta.MediaStorageSOPClassUID = '1.1' meta.MediaStorageSOPInstanceUID = '1.2' meta.TransferSyntaxUID = '1.3' meta.ImplementationClassUID = '1.4' _write_file_meta_info(self.fp, meta) self.fp.seek(0) prefix = self.fp.read(4) self.assertEqual(prefix, b'DICM')
def test_missing_elements(self): """Test that missing required elements raises ValueError.""" meta = Dataset() self.assertRaises(ValueError, _write_file_meta_info, self.fp, meta) meta.MediaStorageSOPClassUID = '1.1' self.assertRaises(ValueError, _write_file_meta_info, self.fp, meta) meta.MediaStorageSOPInstanceUID = '1.2' self.assertRaises(ValueError, _write_file_meta_info, self.fp, meta) meta.TransferSyntaxUID = '1.3' self.assertRaises(ValueError, _write_file_meta_info, self.fp, meta) meta.ImplementationClassUID = '1.4' _write_file_meta_info(self.fp, meta)
def test_group_length_updated(self): """Test that FileMetaInformationGroupLength gets updated if present.""" meta = Dataset() meta.FileMetaInformationGroupLength = 100 # Actual length meta.MediaStorageSOPClassUID = '1.1' meta.MediaStorageSOPInstanceUID = '1.2' meta.TransferSyntaxUID = '1.3' meta.ImplementationClassUID = '1.4' _write_file_meta_info(self.fp, meta) self.fp.seek(12) self.assertEqual(self.fp.read(4), b'\x3E\x00\x00\x00') # Check original file meta is unchanged/updated self.assertEqual(meta.FileMetaInformationGroupLength, 62) self.assertEqual(meta.FileMetaInformationVersion, b'\x00\x01') self.assertEqual(meta.MediaStorageSOPClassUID, '1.1') self.assertEqual(meta.MediaStorageSOPInstanceUID, '1.2') self.assertEqual(meta.TransferSyntaxUID, '1.3') self.assertEqual(meta.ImplementationClassUID, '1.4')
def test_filelike_position(self): """Test that the file-like's ending position is OK.""" # 4 bytes prefix # 8 + 4 bytes FileMetaInformationGroupLength # 12 + 2 bytes FileMetaInformationVersion # 8 + 4 bytes MediaStorageSOPClassUID # 8 + 4 bytes MediaStorageSOPInstanceUID # 8 + 4 bytes TransferSyntaxUID # 8 + 4 bytes ImplementationClassUID # 78 bytes total meta = Dataset() meta.MediaStorageSOPClassUID = '1.1' meta.MediaStorageSOPInstanceUID = '1.2' meta.TransferSyntaxUID = '1.3' meta.ImplementationClassUID = '1.4' _write_file_meta_info(self.fp, meta) self.assertEqual(self.fp.tell(), 78) # 8 + 6 bytes ImplementationClassUID # 80 bytes total, group length 64 self.fp.seek(0) meta.ImplementationClassUID = '1.4.1' _write_file_meta_info(self.fp, meta) # Check File Meta length self.assertEqual(self.fp.tell(), 80) # Check Group Length self.fp.seek(12) self.assertEqual(self.fp.read(4), b'\x40\x00\x00\x00') _write_file_meta_info(self.fp, meta)