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<title>trf-intro - Trf transformer commands</title>
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<! -- Generated from file 'trf.man' by tcllib/doctools with format 'html'
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<body><div class="doctools">
<h1 class="title">trf-intro(3trf) 2.1.3 "Trf transformer commands"</h1>
<div id="name" class="section"><h2><a name="name">Name</a></h2>
<p>trf-intro - Introduction to Trf</p>
</div>
<div id="toc" class="section"><h2><a name="toc">Table Of Contents</a></h2>
<ul class="toc">
<li class="section"><a href="#toc">Table Of Contents</a></li>
<li class="section"><a href="#synopsis">Synopsis</a></li>
<li class="section"><a href="#section1">Description</a></li>
<li class="section"><a href="#section2">BACKGROUND</a></li>
<li class="section"><a href="#section3">API</a></li>
<li class="section"><a href="#see-also">See Also</a></li>
<li class="section"><a href="#keywords">Keywords</a></li>
<li class="section"><a href="#copyright">Copyright</a></li>
</ul>
</div>
<div id="synopsis" class="section"><h2><a name="synopsis">Synopsis</a></h2>
<div class="synopsis">
<ul class="requirements">
<li>package require <b class="pkgname">Tcl <span class="opt">?8.2?</span></b></li>
<li>package require <b class="pkgname">Trf <span class="opt">?2.1.3?</span></b></li>
</ul>
</div>
</div>
<div id="section1" class="section"><h2><a name="section1">Description</a></h2>
<p>The package <b class="package">Trf</b> provides a number of commands which take
data and transform them in various ways.</p>
</div>
<div id="section2" class="section"><h2><a name="section2">BACKGROUND</a></h2>
<p>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.</p>
<p>This allows things like transparent encryption, compression, charset
recoding, etc.</p>
<p>Since version 8.2 of the tcl core the aforementioned patches are part
of the tcl core itself, changing the status of <b class="package">trf</b> from
"extension requiring core patches" to "normal extension".</p>
<p>Other packages built upon either the stackd channels directly, or Trf
are:</p>
<ol class="enumerated">
<li><p><b class="package">TrfCrypt</b>, by myself, contains various encryption systems</p></li>
<li><p><b class="package">TLS</b>, an SSL/TLS implementation by Matt Newman.</p></li>
<li><p><b class="package">Tcl MIME</b> by Marshall Rose.</p></li>
</ol>
</div>
<div id="section3" class="section"><h2><a name="section3">API</a></h2>
<p>The commands provide by <b class="package">trf</b> can be placed into the three
categories listed below. Note that all commands are added to the
global namespace.</p>
<dl class="definitions">
<dt><i class="term">Encodings</i></dt>
<dd><p>The encoding commands either take some data and return the same data
in encoded form, or take encoded data and return a decoded result.</p>
<ol class="enumerated">
<li><p><b class="cmd">oct</b></p></li>
<li><p><b class="cmd">hex</b></p></li>
<li><p><b class="cmd">oct</b></p></li>
<li><p><b class="cmd">base64</b></p></li>
<li><p><b class="cmd">uuencode</b></p></li>
<li><p><b class="cmd">ascii85</b></p></li>
<li><p><b class="cmd">otp_words</b></p></li>
<li><p><b class="cmd">quoted-printable</b></p></li>
</ol></dd>
<dt><i class="term">Message Digests</i></dt>
<dd><p>The second category are message digests in general, simple ones like
<b class="cmd">crc</b>, and cryptographically strong algorithms like <b class="cmd">md5</b>.</p>
<ol class="enumerated">
<li><p><b class="cmd">crc-zlib</b></p></li>
<li><p><b class="cmd">crc</b></p></li>
<li><p><b class="cmd">adler</b></p></li>
<li><p><b class="cmd">md2</b></p></li>
<li><p><b class="cmd">md5</b></p></li>
<li><p><b class="cmd">md5_otp</b></p></li>
<li><p><b class="cmd">sha</b></p></li>
<li><p><b class="cmd">sha1</b></p></li>
<li><p><b class="cmd">sha1_otp</b></p></li>
<li><p><b class="cmd">haval</b></p></li>
<li><p><b class="cmd">ripemd-160</b></p></li>
<li><p><b class="cmd">ripemd-128</b></p></li>
</ol></dd>
<dt>Miscellaneous</dt>
<dd><p>At last a number of commands not readily placed into categories
providing password crypting, general transformations, data
compression, error correction and others.</p>
<ol class="enumerated">
<li><p><b class="cmd">crypt</b></p></li>
<li><p><b class="cmd">md5crypt</b></p></li>
<li><p><b class="cmd">transform</b></p></li>
<li><p><b class="cmd">rs_ecc</b></p></li>
<li><p><b class="cmd">zip</b></p></li>
<li><p><b class="cmd">bz2</b></p></li>
<li><p><b class="cmd">unstack</b></p></li>
</ol></dd>
</dl>
</div>
<div id="see-also" class="section"><h2><a name="see-also">See Also</a></h2>
<p>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</p>
</div>
<div id="keywords" class="section"><h2><a name="keywords">Keywords</a></h2>
<p>compression, encoding, error correction, message digest, transformation</p>
</div>
<div id="copyright" class="section"><h2><a name="copyright">Copyright</a></h2>
<p>Copyright © 1996-2003, Andreas Kupries <andreas_kupries@users.sourceforge.net></p>
</div>
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