"""The gzip file entry implementation."""
from dfdatetime import posix_time as dfdatetime_posix_time
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 GzipFileEntry(root_only_file_entry.RootOnlyFileEntry):
"""File system file entry that uses gzip."""
TYPE_INDICATOR = definitions.TYPE_INDICATOR_GZIP
[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 gzip file is missing.
"""
gzip_file = resolver.Resolver.OpenFileObject(
path_spec, resolver_context=resolver_context
)
if not gzip_file:
raise errors.BackEndError("Missing gzip file.")
super().__init__(
resolver_context,
file_system,
path_spec,
is_root=is_root,
is_virtual=is_virtual,
)
self._gzip_file = gzip_file
self.entry_type = definitions.FILE_ENTRY_TYPE_FILE
@property
def modification_time(self):
"""dfdatetime.DateTimeValues: modification time or None if not available."""
timestamps = self._gzip_file.modification_times
if not timestamps:
return None
return dfdatetime_posix_time.PosixTime(timestamp=timestamps[0])
@property
def size(self):
"""int: size of the file entry in bytes or None if not available."""
return self._gzip_file.uncompressed_data_size