def test_get_testdata_file_external_hash_match(self):
"""Test that external source is used when hash is OK."""
fname = "693_UNCI.dcm"
p = self.dpath / fname
ext_hash = calculate_file_hash(p)
ref_hash = get_cached_filehash(p.name)
assert ext_hash == ref_hash
fpath = self.as_posix(get_testdata_file(fname))
assert "data_store/data" in fpath
def test_get_testdata_files_hash_match(self):
"""Test that the external source is not used when hash is not OK."""
p = self.dpath / "693_UNCI.dcm"
ext_hash = calculate_file_hash(p)
ref_hash = get_cached_filehash(p.name)
assert ext_hash == ref_hash
fpaths = get_testdata_files("693_UNCI*")
fpaths = [self.as_posix(p) for p in fpaths]
assert 2 == len(fpaths)
assert "data_store/data" in fpaths[0]
assert ".pydicom/data" in fpaths[1]
def test_get_testdata_file_external_hash_mismatch(self):
"""Test that the external source is not used when hash is not OK."""
p = self.dpath / "693_UNCI.dcm"
with open(p, 'wb') as f:
f.write(b"\x00\x01")
ext_hash = calculate_file_hash(p)
ref_hash = get_cached_filehash(p.name)
assert ext_hash != ref_hash
fpath = self.as_posix(get_testdata_file(p.name))
assert ".pydicom/data" in fpath
def test_get_testdata_file_external_ignore_hash(self):
"""Test that non-pydicom-data external source ignores hash check."""
EXTERNAL_DATA_SOURCES['mylib'] = EXTERNAL_DATA_SOURCES['pydicom-data']
p = self.dpath / "693_UNCI.dcm"
with open(p, 'wb') as f:
f.write(b"\x00\x01")
ext_hash = calculate_file_hash(p)
ref_hash = get_cached_filehash(p.name)
assert ext_hash != ref_hash
fpath = self.as_posix(get_testdata_file(p.name))
assert "data_store/data" in fpath
def test_get_testdata_files_external_ignore_hash(self):
"""Test that non-pydicom-data external source ignores hash check."""
external_data_sources()['mylib'] = external_data_sources(
)['pydicom-data']
p = self.dpath / "693_UNCI.dcm"
with open(p, 'wb') as f:
f.write(b"\x00\x01")
ext_hash = calculate_file_hash(p)
ref_hash = get_cached_filehash(p.name)
assert ext_hash != ref_hash
fpaths = get_testdata_files("693_UNCI*")
fpaths = [self.as_posix(p) for p in fpaths]
assert 2 == len(fpaths)
assert "data_store/data" in fpaths[0]
assert ".pydicom/data" in fpaths[1]
def _check_data_hash(fpath: str) -> bool:
"""Return ``True`` if the SHA256 checksum of the file at ``fpath`` is OK.
Parameters
----------
fpath : str
The absolute path to the file to perform the checksum for.
Returns
-------
bool
``True`` if the checksum matches those in ``hashes.json``, ``False``
otherwise.
Raises
------
pydicom.data.download.NoHashFound
If the file is missing from ``hashes.json``.
"""
p = Path(fpath)
ext_hash = calculate_file_hash(p)
ref_hash = get_cached_filehash(p.name)
return ext_hash == ref_hash
