This document accompanies trf 2.1p2, as
distributed at August 20, 2001
If you are interested in a version of Trf usable
with Tcl 7.6, please go and have a look at version 1.8, the
last one supporting that version of Tcl.
trf is an extension library to the script language tcl, as created
by John Ousterhout. It extends the language at the C-level with so-called
``transformer''-procedures. With the help of some patches to the core
the package is able to intercept all read/write operations on
designated channels, thus giving it the ability to transform the
buffer contents as desired. This allows things like transparent
encryption, compression, charset recoding, etc.
Build upon this framework (and as proof of concept) a collection of
tcl-level commands was implemented, most of them related to
cryptography. Additionally some binary data support is put in as well.
Note: The patches mentionend above are required only for Tcl
8.0.x and 8.1.x. Since version 8.2 the Trf patches are an official
part of the core.
Packages built upon the fundament provided by trf are