def is_dicom(file):
"""Boolean specifying if file is a proper DICOM file.
This function is a pared down version of read_preamble meant for a fast return.
The file is read for a proper preamble ('DICM'), returning True if so,
and False otherwise. This is a conservative approach.
Parameters
----------
file : str
The path to the file.
See Also
--------
pydicom.filereader.read_preamble
pydicom.filereader.read_partial
"""
is_valid_file(file, raise_error=True)
fp = open(file, 'rb')
preamble = fp.read(0x80)
prefix = fp.read(4)
if prefix == b"DICM":
return True
else:
return False
def is_dicom(file):
"""Boolean specifying if file is a proper DICOM file.
This function is a pared down version of read_preamble meant for a fast return.
The file is read for a proper preamble ('DICM'), returning True if so,
and False otherwise. This is a conservative approach.
Parameters
----------
file : str
The path to the file.
See Also
--------
pydicom.filereader.read_preamble
pydicom.filereader.read_partial
"""
is_valid_file(file, raise_error=True)
fp = open(file, 'rb')
preamble = fp.read(0x80)
prefix = fp.read(4)
if prefix == b"DICM":
return True
else:
return False
def __init__(self, filepath=None):
"""
Parameters
----------
filepath : None, str
If None, image must be loaded later.
If a str, path to the image file.
"""
if filepath is not None and is_valid_file(filepath):
self.image = Image.load(filepath)
else:
self.image = np.zeros((1,1))
def test_invalid_file_str(self):
not_a_file = "file"
self.assertFalse(is_valid_file(not_a_file, raise_error=False))
self.assertRaises(FileExistsError, is_valid_file, not_a_file)
def test_valid_file(self):
real_file = __file__
self.assertTrue(is_valid_file(real_file))
real_file_obj = open(__file__)
self.assertTrue(is_valid_file(real_file_obj))
