Merged revisions 77472-77473 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r77472 | antoine.pitrou | 2010-01-13 15:32:10 +0100 (mer., 13 janv. 2010) | 5 lines

  Issue #2846: Add support for gzip.GzipFile reading zero-padded files.
  Patch by Brian Curtin.
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  r77473 | antoine.pitrou | 2010-01-13 15:32:51 +0100 (mer., 13 janv. 2010) | 3 lines

  Add ACKS entry for r77472.
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diff --git a/Lib/gzip.py b/Lib/gzip.py
index 66fc88d..ef6befc 100644
--- a/Lib/gzip.py
+++ b/Lib/gzip.py
@@ -348,6 +348,15 @@
         elif isize != (self.size & 0xffffffff):
             raise IOError("Incorrect length of data produced")
 
+        # Gzip files can be padded with zeroes and still have archives.
+        # Consume all zero bytes and set the file position to the first
+        # non-zero byte. See http://www.gzip.org/#faq8
+        c = b"\x00"
+        while c == b"\x00":
+            c = self.fileobj.read(1)
+        if c:
+            self.fileobj.seek(-1, 1)
+
     @property
     def closed(self):
         return self.fileobj is None