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#
# 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()
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