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From "Niklas Therning (JIRA)" <server-...@james.apache.org>
Subject [jira] Created: (MIME4J-62) Unnecessary qp encoding of SPACE and TAB characters in CodecUtil
Date Mon, 21 Jul 2008 09:35:31 GMT
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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