quoted-printable(3trf)
NAME
quoted-printable - Encoding "quoted-printable"
SYNOPSIS
package require Tcl ?8.2? package require Trf ?2.1.3? quoted-printable ?options...? ?data?
DESCRIPTION
The command quoted-printable is one of several data encodings provided
by the package trf. See trf-intro for an overview of the whole package.
Printable ASCII characters are largely untouched. Otherwise a three-
character encoding sequence is used. This is MIME's compromise
encoding. See RFC 2045 (http://www.rfc-editor.org/rfc/rfc2045.txt) for
its definition.
quoted-printable ?options...? ?data?
-mode encode|decode
This option has to be present and is always understood by
the encoding.
For immediate mode the argument value specifies the
operation to use. For an attached encoding it specifies
the operation to use for writing. Reading will
automatically use the reverse operation. See section
IMMEDIATE versus ATTACHED for explanations of these two
terms.
Beyond the argument values listed above all unique
abbreviations are recognized too.
Encode converts from arbitrary (most likely binary) data
into the described representation, decode does the
reverse .
-attach channel
The presence/absence of this option determines the main
operation mode of the transformation.
If present the transformation will be stacked onto the
channel whose handle was given to the option and run in
attached mode. More about this in section IMMEDIATE
versus ATTACHED.
If the option is absent the transformation is used in
immediate mode and the options listed below are
recognized. More about this in section IMMEDIATE versus
ATTACHED.
-in channel
This options is legal if and only if the transformation
is used in immediate mode. It provides the handle of the
channel the data to transform has to be read from.
If the transformation is in immediate mode and this
option is absent the data to transform is expected as the
last argument to the transformation.
-out channel
This options is legal if and only if the transformation
is used in immediate mode. It provides the handle of the
channel the generated transformation result is written
to.
If the transformation is in immediate mode and this
option is absent the generated data is returned as the
result of the command itself.
IMMEDIATE VERSUS ATTACHED
The transformation distinguishes between two main ways of using it. These are the immediate and attached operation modes. For the attached mode the option -attach is used to associate the transformation with an existing channel. During the execution of the command no transformation is performed, instead the channel is changed in such a way, that from then on all data written to or read from it passes through the transformation and is modified by it according to the definition above. This attachment can be revoked by executing the command unstack for the chosen channel. This is the only way to do this at the Tcl level. In the second mode, which can be detected by the absence of option -attach, the transformation immediately takes data from either its commandline or a channel, transforms it, and returns the result either as result of the command, or writes it into a channel. The mode is named after the immediate nature of its execution. Where the data is taken from, and delivered to, is governed by the presence and absence of the options -in and -out. It should be noted that this ability to immediately read from and/or write to a channel is an historic artifact which was introduced at the beginning of Trf's life when Tcl version 7.6 was current as this and earlier versions have trouble to deal with \0 characters embedded into either input or output.
SEE ALSO
ascii85, base64, bin, hex, oct, otp_words, quoted-printable, trf-intro, uuencode
KEYWORDS
encoding, mime, quoted-printable, rfc 2045
COPYRIGHT
Copyright (c) 1996-2003, Andreas Kupries <andreas_kupries@users.sourceforge.net>
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