trf-intro(3trf) 														   trf-intro(3trf)

NAME

       trf-intro - Introduction to Trf

SYNOPSIS

       package require Tcl  ?8.2?

       package require Trf  ?2.1.3?

DESCRIPTION

       The package Trf provides a number of commands which take data and transform them in various ways.

BACKGROUND

       The  implementation  of	Trf  began  as proof-of-concept of the validity and usefulness of the "stacked channel" patches to the core. These
       patches allow the writing of extensions to the generic I/O system of the core which are able to intercept all read/write operations on des-
       ignated channels, thus giving it the ability to transform the data flowing through these channels as desired.

       This allows things like transparent encryption, compression, charset recoding, etc.

       Since  version  8.2  of the tcl core the aforementioned patches are part of the tcl core itself, changing the status of trf from "extension
       requiring core patches" to "normal extension".

       Other packages built upon either the stackd channels directly, or Trf are:

       [1]    TrfCrypt, by myself, contains various encryption systems

       [2]    TLS, an SSL/TLS implementation by Matt Newman.

       [3]    Tcl MIME by Marshall Rose.

API

       The commands provide by trf can be placed into the three categories listed below. Note that all commands are added to the global namespace.

       Encodings
	      The encoding commands either take some data and return the same data in encoded form, or take encoded  data  and	return	a  decoded
	      result.

	      [1]    oct

	      [2]    hex

	      [3]    oct

	      [4]    base64

	      [5]    uuencode

	      [6]    ascii85

	      [7]    otp_words

	      [8]    quoted-printable

       Message Digests
	      The second category are message digests in general, simple ones like crc, and cryptographically strong algorithms like md5.

	      [1]    crc-zlib

	      [2]    crc

	      [3]    adler

	      [4]    md2

	      [5]    md5

	      [6]    md5_otp

	      [7]    sha

	      [8]    sha1

	      [9]    sha1_otp

	      [10]   haval

	      [11]   ripemd-160

	      [12]   ripemd-128

       Miscellaneous
	      At  last a number of commands not readily placed into categories providing password crypting, general transformations, data compres-
	      sion, error correction and others.

	      [1]    crypt

	      [2]    md5crypt

	      [3]    transform

	      [4]    rs_ecc

	      [5]    zip

	      [6]    bz2

	      [7]    unstack

SEE ALSO

       adler, ascii85, base64, bz2, crc, crc-zlib, crypt, haval, hex, md2, md5, md5_otp, md5crypt, oct, otp_words,  quoted-printable,  ripemd-128,
       ripemd-160, rs_ecc, sha, sha1, sha1_otp, transform, uuencode, zip

KEYWORDS

       compression, encoding, error correction, message digest, transformation

COPYRIGHT

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

Trf transformer commands					       2.1.3							   trf-intro(3trf)