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bin(n)									bin(n)

______________________________________________________________________________

NAME
       bin - Encoding "bin"

SYNOPSIS
       package require Tcl  ?8.2?

       package require Trf  ?2.1.4?

       bin ?options...? ?data?

_________________________________________________________________

DESCRIPTION
       The  command bin is one of several data encodings provided by the pack‐
       age trf. See trf-intro for an overview of the whole package.

       This encoding transforms every byte in the input into a sequence	 of  8
       characters containing the binary representation of the byte.  For exam‐
       ple

	    % bin -mode encode Z
	    01011010

       bin ?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 oper‐
		     ation 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 abbre‐
		     viations 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 ver‐
		     sus ATTACHED.

		     If the option is absent the  transformation  is  used  in
		     immediate	mode  and  the options listed below are recog‐
		     nized.  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 com‐
       mandline 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 out‐
       put.

SEE ALSO
       ascii85, base64, bin, hex, oct, otp_words, quoted-printable, trf-intro,
       uuencode

KEYWORDS
       bin, encoding, hex, oct

COPYRIGHT
       Copyright (c) 1996-2003, Andreas Kupries <andreas_kupries@users.sourceforge.net>

Trf transformer commands	     2.1.4				bin(n)
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