def _OpenFileObject(self, path_spec):
"""Opens the file-like object defined by path specification.
Args:
path_spec (PathSpec): path specification.
Returns:
pyewf.handle: a file-like object or None.
Raises:
PathSpecError: if the path specification is invalid.
"""
if not path_spec.HasParent():
raise errors.PathSpecError(
'Unsupported path specification without parent.')
parent_path_spec = path_spec.parent
file_system = resolver.Resolver.OpenFileSystem(
parent_path_spec, resolver_context=self._resolver_context)
# Note that we cannot use pyewf's glob function since it does not
# handle the file system abstraction dfvfs provides.
segment_file_path_specs = ewf.EWFGlobPathSpec(file_system, path_spec)
if not segment_file_path_specs:
return None
if parent_path_spec.IsSystemLevel():
# Typically the file-like object cache should have room for 127 items.
self._resolver_context.SetMaximumNumberOfFileObjects(
len(segment_file_path_specs) + 127)
for segment_file_path_spec in segment_file_path_specs:
file_object = resolver.Resolver.OpenFileObject(
segment_file_path_spec,
resolver_context=self._resolver_context)
self._file_objects.append(file_object)
ewf_handle = pyewf.handle()
ewf_handle.open_file_objects(self._file_objects)
return ewf_handle
def testGlobE01(self):
"""Test the glob function."""
expected_segment_file_path_specs = []
file_system = self._BuildFileFakeFileSystem(
u'image.E01', 1, expected_segment_file_path_specs)
# Test single segment file: E01.
path_spec = fake_path_spec.FakePathSpec(location=u'/image.E01')
path_spec = ewf_path_spec.EWFPathSpec(parent=path_spec)
segment_file_path_specs = ewf.EWFGlobPathSpec(file_system, path_spec)
self.assertEqual(len(segment_file_path_specs),
len(expected_segment_file_path_specs))
self.assertEqual(segment_file_path_specs,
expected_segment_file_path_specs)
# Test non exiting segment file: E01.
expected_segment_file_path_specs = []
path_spec = fake_path_spec.FakePathSpec(location=u'/bogus.E01')
path_spec = ewf_path_spec.EWFPathSpec(parent=path_spec)
segment_file_path_specs = ewf.EWFGlobPathSpec(file_system, path_spec)
self.assertEqual(len(segment_file_path_specs),
len(expected_segment_file_path_specs))
self.assertEqual(segment_file_path_specs,
expected_segment_file_path_specs)
# Test multiple segment files: E01-E10.
expected_segment_file_path_specs = []
file_system = self._BuildFileFakeFileSystem(
u'image.E01', 10, expected_segment_file_path_specs)
path_spec = fake_path_spec.FakePathSpec(location=u'/image.E01')
path_spec = ewf_path_spec.EWFPathSpec(parent=path_spec)
segment_file_path_specs = ewf.EWFGlobPathSpec(file_system, path_spec)
self.assertEqual(len(segment_file_path_specs),
len(expected_segment_file_path_specs))
self.assertEqual(segment_file_path_specs,
expected_segment_file_path_specs)
# Test multiple segment files: E01-E99,EAA.
expected_segment_file_path_specs = []
file_system = self._BuildFileFakeFileSystem(
u'image.E01', 100, expected_segment_file_path_specs)
path_spec = fake_path_spec.FakePathSpec(location=u'/image.E01')
path_spec = ewf_path_spec.EWFPathSpec(parent=path_spec)
segment_file_path_specs = ewf.EWFGlobPathSpec(file_system, path_spec)
self.assertEqual(len(segment_file_path_specs),
len(expected_segment_file_path_specs))
self.assertEqual(segment_file_path_specs,
expected_segment_file_path_specs)
# Test multiple segment files: E01-E99,EAA-EBA.
expected_segment_file_path_specs = []
file_system = self._BuildFileFakeFileSystem(
u'image.E01', 126, expected_segment_file_path_specs)
path_spec = fake_path_spec.FakePathSpec(location=u'/image.E01')
path_spec = ewf_path_spec.EWFPathSpec(parent=path_spec)
segment_file_path_specs = ewf.EWFGlobPathSpec(file_system, path_spec)
self.assertEqual(len(segment_file_path_specs),
len(expected_segment_file_path_specs))
self.assertEqual(segment_file_path_specs,
expected_segment_file_path_specs)
# Test multiple segment files: E01-E99,EAA-EZZ.
expected_segment_file_path_specs = []
file_system = self._BuildFileFakeFileSystem(
u'image.E01', 775, expected_segment_file_path_specs)
path_spec = fake_path_spec.FakePathSpec(location=u'/image.E01')
path_spec = ewf_path_spec.EWFPathSpec(parent=path_spec)
segment_file_path_specs = ewf.EWFGlobPathSpec(file_system, path_spec)
self.assertEqual(len(segment_file_path_specs),
len(expected_segment_file_path_specs))
self.assertEqual(segment_file_path_specs,
expected_segment_file_path_specs)
# Test multiple segment files: E01-E99,EAA-ZZZ.
expected_segment_file_path_specs = []
file_system = self._BuildFileFakeFileSystem(
u'image.E01', 14970, expected_segment_file_path_specs)
path_spec = fake_path_spec.FakePathSpec(location=u'/image.E01')
path_spec = ewf_path_spec.EWFPathSpec(parent=path_spec)
segment_file_path_specs = ewf.EWFGlobPathSpec(file_system, path_spec)
self.assertEqual(len(segment_file_path_specs),
len(expected_segment_file_path_specs))
self.assertEqual(segment_file_path_specs,
expected_segment_file_path_specs)
# Test multiple segment files: E01-E99,EAA-[ZZ.
expected_segment_file_path_specs = []
file_system = self._BuildFileFakeFileSystem(
u'image.E01', 14971, expected_segment_file_path_specs)
path_spec = fake_path_spec.FakePathSpec(location=u'/image.E01')
path_spec = ewf_path_spec.EWFPathSpec(parent=path_spec)
with self.assertRaises(RuntimeError):
segment_file_path_specs = ewf.EWFGlobPathSpec(
file_system, path_spec)