# -*- coding: utf-8 -*-
"""The encrypted stream file entry implementation."""
from dfvfs.lib import definitions
from dfvfs.lib import errors
from dfvfs.resolver import resolver
from dfvfs.vfs import root_only_file_entry
[docs]
class EncryptedStreamFileEntry(root_only_file_entry.RootOnlyFileEntry):
"""Encrypted stream file entry."""
TYPE_INDICATOR = definitions.TYPE_INDICATOR_ENCRYPTED_STREAM
[docs]
def __init__(
self, resolver_context, file_system, path_spec, is_root=False,
is_virtual=False):
"""Initializes a file entry.
Args:
resolver_context (Context): resolver context.
file_system (FileSystem): file system.
path_spec (PathSpec): path specification.
is_root (Optional[bool]): True if the file entry is the root file entry
of the corresponding file system.
is_virtual (Optional[bool]): True if the file entry is a virtual file
Raises:
BackEndError: when the encrypted stream is missing.
"""
encrypted_stream = resolver.Resolver.OpenFileObject(
path_spec, resolver_context=resolver_context)
if not encrypted_stream:
raise errors.BackEndError(
f'Unable to open encrypted stream: {self.path_spec.comparable:s}.')
super(EncryptedStreamFileEntry, self).__init__(
resolver_context, file_system, path_spec, is_root=is_root,
is_virtual=is_virtual)
self._encrypted_stream = encrypted_stream
self.entry_type = definitions.FILE_ENTRY_TYPE_FILE
@property
def size(self):
"""int: size of the file entry in bytes or None if not available."""
return self._encrypted_stream.get_size()