See the file man.macros.
trf-intro - Introduction to Trf
package require Tcl ?8.2?
package require Trf ?2.1.3?
The package Trf
provides a number of commands which take data and
transform them in various ways.
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,
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:
- TrfCrypt, by myself, contains various encryption systems
- TLS, an SSL/TLS implementation by Matt Newman.
- Tcl MIME by Marshall Rose.
The commands provide by trf
can be placed into the three categories
listed below. Note that all commands are added to the global namespace.
- The encoding commands either take some data and return the same data in
encoded form, or take encoded data and return a decoded result.
- Message Digests
- The second category are message digests in general, simple ones like
crc, and cryptographically strong algorithms like md5.
- At last a number of commands not readily placed into categories providing
password crypting, general transformations, data compression, error
correction and others.
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
compression, encoding, error correction, message digest, transformation
Copyright (c) 1996-2003, Andreas Kupries <email@example.com>