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- #
- # The Python Imaging Library.
- # $Id: TarIO.py 2134 2004-10-06 08:55:20Z fredrik $
- #
- # 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 ContainerIO
- import string
-
- ##
- # A file object that provides read access to a given member of a TAR
- # file.
-
- class TarIO(ContainerIO.ContainerIO):
-
- ##
- # Create file object.
- #
- # @param tarfile Name of TAR file.
- # @param file Name of member file.
-
- def __init__(self, tarfile, file):
-
- fh = open(tarfile, "rb")
-
- while 1:
-
- s = fh.read(512)
- if len(s) != 512:
- raise IOError, "unexpected end of tar file"
-
- name = s[:100]
- i = string.find(name, chr(0))
- if i == 0:
- raise IOError, "cannot find subfile"
- if i > 0:
- name = name[:i]
-
- size = string.atoi(s[124:136], 8)
-
- if file == name:
- break
-
- fh.seek((size + 511) & (~511), 1)
-
- # Open region
- ContainerIO.ContainerIO.__init__(self, fh, fh.tell(), size)
-