mirror of https://github.com/sgoudham/Enso-Bot.git
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
1.4 KiB
Python
66 lines
1.4 KiB
Python
5 years ago
|
#
|
||
|
|
# The Python Imaging Library.
|
||
|
|
# $Id$
|
||
|
|
#
|
||
|
|
# read files from within a tar file
|
||
|
|
#
|
||
|
|
# History:
|
||
|
|
# 95-06-18 fl Created
|
||
|
|
# 96-05-28 fl Open files in binary mode
|
||
|
|
#
|
||
|
|
# Copyright (c) Secret Labs AB 1997.
|
||
|
|
# Copyright (c) Fredrik Lundh 1995-96.
|
||
|
|
#
|
||
|
|
# See the README file for information on usage and redistribution.
|
||
|
|
#
|
||
|
|
|
||
|
|
import io
|
||
|
|
|
||
|
|
from . import ContainerIO
|
||
|
|
|
||
|
|
|
||
|
|
class TarIO(ContainerIO.ContainerIO):
|
||
|
|
"""A file object that provides read access to a given member of a TAR file."""
|
||
|
|
|
||
|
|
def __init__(self, tarfile, file):
|
||
|
|
"""
|
||
|
|
Create file object.
|
||
|
|
|
||
|
|
:param tarfile: Name of TAR file.
|
||
|
|
:param file: Name of member file.
|
||
|
|
"""
|
||
|
|
self.fh = open(tarfile, "rb")
|
||
|
|
|
||
|
|
while True:
|
||
|
|
|
||
|
|
s = self.fh.read(512)
|
||
|
|
if len(s) != 512:
|
||
|
|
raise OSError("unexpected end of tar file")
|
||
|
|
|
||
|
|
name = s[:100].decode("utf-8")
|
||
|
|
i = name.find("\0")
|
||
|
|
if i == 0:
|
||
|
|
raise OSError("cannot find subfile")
|
||
|
|
if i > 0:
|
||
|
|
name = name[:i]
|
||
|
|
|
||
|
|
size = int(s[124:135], 8)
|
||
|
|
|
||
|
|
if file == name:
|
||
|
|
break
|
||
|
|
|
||
|
|
self.fh.seek((size + 511) & (~511), io.SEEK_CUR)
|
||
|
|
|
||
|
|
# Open region
|
||
|
|
super().__init__(self.fh, self.fh.tell(), size)
|
||
|
|
|
||
|
|
# Context manager support
|
||
|
|
def __enter__(self):
|
||
|
|
return self
|
||
|
|
|
||
|
|
def __exit__(self, *args):
|
||
|
|
self.close()
|
||
|
|
|
||
|
|
def close(self):
|
||
|
|
self.fh.close()
|