From: "briantobin (Brian Tobin)" <brian@...>
Date: 2012-10-17T07:01:17+09:00
Subject: [ruby-core:48036] [ruby-trunk - Bug #7175] unpack('M*') changed behavior between patchlevels


Issue #7175 has been updated by briantobin (Brian Tobin).


After reading the changelog I see that this changed b/c of bug #5635 (http://bugs.ruby-lang.org/issues/5635).

I still believe that this might be a regression. Looking at our data, the last lines of quoted-printable strings produced by Microsoft products generally have an "=" and no newline.

Reading RFC2045 (http://www.ietf.org/rfc/rfc2045.txt), page 21, item #2, I see that this is invalid. But in practice I'm seeing that it's common.
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Bug #7175: unpack('M*') changed behavior between patchlevels
https://bugs.ruby-lang.org/issues/7175#change-30904

Author: briantobin (Brian Tobin)
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.3.0]


I'm seeing an important difference in the output of string.unpack between two patchlevels of ruby 1.9.3. The output of patchlevel 194 is expected, and the output of 286 is unexpected.

--- Console 1 ---
>> RUBY_VERSION
=> "1.9.3"
>> RUBY_PATCHLEVEL
=> 194
>> "foo =3D =".unpack("M*")
=> ["foo = "]

--- Console 2 ---
>> RUBY_VERSION
=> "1.9.3"
>> RUBY_PATCHLEVEL
=> 286
>> "foo =3D =".unpack("M*")
=> ["foo = ="]

Was this a purposeful change? Our code is processing emails with the "quoted printable" encoding. After upgrading to patchlevel 286 we are getting trailing equals signs after decoding. I feel like this is a regression.

Thanks in advance!

Brian


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