Unnecessary qp encoding of SPACE and TAB characters in CodecUtil
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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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