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projecten1/lib/python3.6/site-packages/PIL/TarIO.py

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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)