Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2

Newsgroups	comp.lang.python
Date	2013-09-25 09:38 -0700
Message-ID	<14063249-6159-48ff-bfe2-8e8d6e3cd7a4@googlegroups.com> (permalink)
Subject	Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2
From	nilsbunger@gmail.com

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Hi, 

I'm having trouble encoding a MIME message with a binary file.  Newline characters are being interpreted even though the content is supposed to be binary. This is using Python 3.3.2

Small test case:

app = MIMEApplication(b'Q\x0dQ', _encoder=encode_noop)
b = io.BytesIO()
g = BytesGenerator(b)
g.flatten(app)
for i in b.getvalue()[-3:]:
    print ("%02x " % i, end="")
print ()

This prints 51 0a 51,  meaning the 0x0d character got reinterpreted as a newline. 

I've tried setting an email policy of HTTP policy, but that goes even further, converting \r to \r\n

This is for HTTP transport, so binary encoding is normal.

Any thoughts how I can do this properly?

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Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2 nilsbunger@gmail.com - 2013-09-25 09:38 -0700
  Re: Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2 Chris Angelico <rosuav@gmail.com> - 2013-09-26 14:11 +1000
    Re: Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2 Nils Bunger <nilsbunger@gmail.com> - 2013-09-25 21:23 -0700
      Re: Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2 Chris Angelico <rosuav@gmail.com> - 2013-09-26 14:32 +1000
        Re: Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2 Neil Cerutti <neilc@norwich.edu> - 2013-09-26 13:41 +0000
          Re: Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2 Nils Bunger <nilsbunger@gmail.com> - 2013-09-26 08:56 -0700
            Re: Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2 Piet van Oostrum <piet@vanoostrum.org> - 2013-09-26 14:44 -0400
  Re: Newline interpretation issue with MIMEApplication with binary data, Python 3.3.2 Nils Bunger <nilsbunger@gmail.com> - 2013-09-26 09:35 -0700

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