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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: