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 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
compression, 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>
