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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.
- #
-
- from . import ContainerIO
-
-
- ##
- # A file object that provides read access to a given member of a TAR
- # file.
-
- class TarIO(ContainerIO.ContainerIO):
-
- def __init__(self, tarfile, file):
- """
- Create file object.
-
- :param tarfile: Name of TAR file.
- :param file: Name of member file.
- """
- fh = open(tarfile, "rb")
-
- while True:
-
- s = fh.read(512)
- if len(s) != 512:
- raise IOError("unexpected end of tar file")
-
- name = s[:100].decode('utf-8')
- i = name.find('\0')
- if i == 0:
- raise IOError("cannot find subfile")
- if i > 0:
- name = name[:i]
-
- size = int(s[124:135], 8)
-
- if file == name:
- break
-
- fh.seek((size + 511) & (~511), 1)
-
- # Open region
- ContainerIO.ContainerIO.__init__(self, fh, fh.tell(), size)
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