#
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# The Python Imaging Library.
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# $Id$
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#
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# read files from within a tar file
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#
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# History:
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# 95-06-18 fl Created
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# 96-05-28 fl Open files in binary mode
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#
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# Copyright (c) Secret Labs AB 1997.
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# Copyright (c) Fredrik Lundh 1995-96.
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#
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# See the README file for information on usage and redistribution.
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#
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import ContainerIO
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import string
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##
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# A file object that provides read access to a given member of a TAR
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# file.
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class TarIO(ContainerIO.ContainerIO):
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##
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# Create file object.
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#
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# @param tarfile Name of TAR file.
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# @param file Name of member file.
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def __init__(self, tarfile, file):
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fh = open(tarfile, "rb")
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while 1:
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s = fh.read(512)
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if len(s) != 512:
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raise IOError, "unexpected end of tar file"
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name = s[:100]
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i = string.find(name, chr(0))
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if i == 0:
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raise IOError, "cannot find subfile"
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if i > 0:
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name = name[:i]
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size = string.atoi(s[124:136], 8)
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if file == name:
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break
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fh.seek((size + 511) & (~511), 1)
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# Open region
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ContainerIO.ContainerIO.__init__(self, fh, fh.tell(), size)
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