71 lines
1.5 KiB
Python
71 lines
1.5 KiB
Python
#
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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 sys
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from . import ContainerIO
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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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def __init__(self, tarfile, file):
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"""
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Create file object.
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:param tarfile: Name of TAR file.
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:param file: Name of member file.
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"""
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self.fh = open(tarfile, "rb")
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while True:
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s = self.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].decode('utf-8')
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i = name.find('\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 = int(s[124:135], 8)
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if file == name:
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break
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self.fh.seek((size + 511) & (~511), 1)
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# Open region
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ContainerIO.ContainerIO.__init__(self, self.fh, self.fh.tell(), size)
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# Context manager support
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def __enter__(self):
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return self
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def __exit__(self, *args):
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self.close()
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if sys.version_info.major >= 3:
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def __del__(self):
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self.close()
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def close(self):
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self.fh.close()
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