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rot13.html
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<html>
<head>
<title>
ROT13 - Apply "ROT13" Transformation to a File
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
ROT13 <br> Apply "ROT13" Transformation to a File
</h1>
<hr>
<p>
<b>ROT13</b>
is a C++ program which
reads a file and makes a
copy in which all characters have been "rotated" by 13 positions, and
all digits have been "rotated" by 5 positions.
</p>
<p>
Applying <b>ROT13</b> to the transformed file returns the original.
Thus, <b>ROT13</b> can be used as a very simply method of encoding
and decoding text files. Only an idiot would be fooled by this
encoding, but nonetheless the encoding serves a number of useful
purposes. And often, it's only idiots you have to fool, after all.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>rot13</b> <i>file1.txt</i>
</blockquote>
where
<ul>
<li>
<i>file1.txt</i> is the input file to be encoded.
</li>
</ul>
The output filename is the ROT13 transformation of the input filename.
In the case of "file1.txt", the output filename would be <i>svyr6.gkg</i>.
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>ROT13</b> is available in
<a href = "../../cpp_src/rot13/rot13.html">a C++ version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/cr2lf/cr2lf.html">
CR2LF</a>,
a C++ program which
reads a text file and replaces carriage returns by line feeds.
</p>
<p>
<a href = "../../cpp_src/crrm/crrm.html">
CRRM</a>,
a C++ program which
reads a text file and writes a copy which has no carriage returns.
</p>
<p>
<a href = "../../cpp_src/deblank/deblank.html">
DEBLANK</a>,
a C++ program which
makes a copy of a text file in which blank lines have been removed.
</p>
<p>
<a href = "../../cpp_src/decomment/decomment.html">
DECOMMENT</a>,
a C++ program which
makes a copy of a text file which contains no "comment" lines
(that begin with "#").
</p>
<p>
<a href = "../../cpp_src/filum/filum.html">
FILUM</a>,
a C++ library which
performs various operations on files.
</p>
<p>
<a href = "../../c_src/pig_latin/pig_latin.html">
PIG_LATIN</a>,
a C program which
makes a copy of a file, translating the text into Pig Latin.
</p>
<p>
<a href = "../../f_src/reformat/reformat.html">
REFORMAT</a>,
a FORTRAN90 program which
reads a file that contains only real values, and writes a copy
which has a fixed number of real values on each line.
</p>
<p>
<a href = "../../cpp_src/reword/reword.html">
REWORD</a>,
a C++ program which
makes a copy of a file
in which each line has the same number of "words".
</p>
<p>
<a href = "../../cpp_src/uncontrol/uncontrol.html">
UNCONTROL</a>,
a C++ program which
makes a copy of a text file which contains no control characters.
</p>
<p>
<a href = "../../c_src/uudecode/uudecode.html">
UUDECODE</a>,
a C program which
reads a UU encoded text file and translates it back to its original form.
</p>
<p>
<a href = "../../c_src/uuencode/uuencode.html">
UUENCODE</a>,
a C program which
translates a file (possibly in binary format) to the UU encoding.
</p>
<p>
<a href = "../../cpp_src/wrap/wrap.html">
WRAP</a>,
a C++ program which
makes a copy of a text file in which long lines have been wrapped.
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "rot13.cpp">rot13.cpp</a>, the source code;
</li>
<li>
<a href = "rot13.sh">rot13.sh</a>, commands to
compile and load the source code;
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "gettysburg.txt">gettysburg.txt</a>,
Lincoln's Gettysburg Address.
</li>
<li>
<a href = "trgglfohet.gkg">trgglfohet.gkg</a>,
the file, encoded by ROT13.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for ROT13.
</li>
<li>
<b>CH_TO_ROT13</b> converts a character to its ROT13 equivalent.
</li>
<li>
<b>HANDLE</b> makes a copy of a file after applying ROT13 to it.
</li>
<li>
<b>S_TO_ROT13</b> "rotates" the alphabetical characters in a string by 13 positions.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 21 May 2011.
</i>
<!-- John Burkardt -->
</body>
</html>