trf-intro(n)trf-intro(n)______________________________________________________________________________NAME
trf-intro - Introduction to Trf
SYNOPSIS
package require Tcl ?8.2?
package require Trf ?2.1.4?
_________________________________________________________________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 designated
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 com‐
pression, 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 2.1.4 trf-intro(n)
