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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 ## # 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. """ 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: break self.fh.seek((size + 511) & (~511), io.SEEK_CUR) # Open region super().__init__(self.fh, self.fh.tell(), size) # Context manager support def __enter__(self): return self def __exit__(self, *args): self.close() def close(self): self.fh.close()