def GetFileEntryByPathSpec(self, path_spec):
"""Retrieves a file entry for a path specification.
Args:
path_spec (PathSpec): path specification.
Returns:
NTFSFileEntry: file entry or None if not available.
Raises:
BackEndError: if the file entry cannot be opened.
"""
# Opening a file by MFT entry is faster than opening a file by location.
# However we need the index of the corresponding $FILE_NAME MFT attribute.
fsntfs_file_entry = None
location = getattr(path_spec, 'location', None)
mft_attribute = getattr(path_spec, 'mft_attribute', None)
mft_entry = getattr(path_spec, 'mft_entry', None)
if (location == self.LOCATION_ROOT
or mft_entry == self.MFT_ENTRY_ROOT_DIRECTORY):
fsntfs_file_entry = self._fsntfs_volume.get_root_directory()
return ntfs_file_entry.NTFSFileEntry(
self._resolver_context,
self,
path_spec,
fsntfs_file_entry=fsntfs_file_entry,
is_root=True)
try:
if mft_attribute is not None and mft_entry is not None:
fsntfs_file_entry = self._fsntfs_volume.get_file_entry(
mft_entry)
elif location is not None:
fsntfs_file_entry = self._fsntfs_volume.get_file_entry_by_path(
location)
except IOError as exception:
raise errors.BackEndError(exception)
if fsntfs_file_entry is None:
return None
return ntfs_file_entry.NTFSFileEntry(
self._resolver_context,
self,
path_spec,
fsntfs_file_entry=fsntfs_file_entry)
def testIntialize(self):
"""Tests the __init__ function."""
file_entry = ntfs_file_entry.NTFSFileEntry(self._resolver_context,
self._file_system,
self._ntfs_path_spec)
self.assertIsNotNone(file_entry)