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https://issues.apache.org/jira/browse/MIME4J-62?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615282#action_12615282
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Stefano Bagnara commented on MIME4J-62:
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I agree that the specific encoder for the text parts is the preferred behaviour.
BTW, The 3 failing tests represents a text/plain part, so they will be affected
by a similar change, anyway.
About the CRLF problem I would add an issue but I still have to better
investigate on it.
We anyway won't forget about it because we have the failing tests, so who takes
care of updating the failing tests/expected result for this can also leave the
CRLF failure there or add a JIRA issue depending on his preferences.
> Unnecessary qp encoding of SPACE and TAB characters in CodecUtil
> ----------------------------------------------------------------
>
> Key: MIME4J-62
> URL: https://issues.apache.org/jira/browse/MIME4J-62
> Project: Mime4j
> Issue Type: Bug
> Affects Versions: 0.4
> Reporter: Niklas Therning
> Priority: Minor
> Fix For: 0.4
>
>
> ATM we always encode SPACE and TAB. The result is that the output of the
> encoding is longer than necessary. According to the MIME RFC:
> (3) (White Space) Octets with values of 9 and 32 MAY be
> represented as US-ASCII TAB (HT) and SPACE characters,
> respectively, but MUST NOT be so represented at the end
> of an encoded line. Any TAB (HT) or SPACE characters
> on an encoded line MUST thus be followed on that line
> by a printable character. In particular, an "=" at the
> end of an encoded line, indicating a soft line break
> (see rule #5) may follow one or more TAB (HT) or SPACE
> characters. It follows that an octet with decimal
> value 9 or 32 appearing at the end of an encoded line
> must be represented according to Rule #1. This rule is
> necessary because some MTAs (Message Transport Agents,
> programs which transport messages from one user to
> another, or perform a portion of such transfers) are
> known to pad lines of text with SPACEs, and others are
> known to remove "white space" characters from the end
> of a line. Therefore, when decoding a Quoted-Printable
> body, any trailing white space on a line must be
> deleted, as it will necessarily have been added by
> intermediate transport agents.
> To make the encoded output as short as possible we should try to not encode
> SPACE and TAB unless they are the last character in a line.
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