Update zlib_how.html to match the web page, and add a license.
diff --git a/examples/zlib_how.html b/examples/zlib_how.html
index 444ff1c..43271b9 100644
--- a/examples/zlib_how.html
+++ b/examples/zlib_how.html
@@ -1,10 +1,10 @@
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
- "http://www.w3.org/TR/REC-html40/loose.dtd">
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>zlib Usage Example</title>
-<!-- Copyright (c) 2004, 2005 Mark Adler. -->
+<!-- Copyright (c) 2004-2023 Mark Adler. -->
</head>
<body bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#00A000">
<h2 align="center"> zlib Usage Example </h2>
@@ -17,7 +17,7 @@
annotations are interspersed between lines of the code. So please read between the lines.
We hope this helps explain some of the intricacies of <em>zlib</em>.
<p>
-Without further adieu, here is the program <a href="zpipe.c"><tt>zpipe.c</tt></a>:
+Without further ado, here is the program <a href="zpipe.c"><tt>zpipe.c</tt></a>:
<pre><b>
/* zpipe.c: example of proper use of zlib's inflate() and deflate()
Not copyrighted -- provided to the public domain
@@ -155,13 +155,11 @@
</b></pre>
We start off by reading data from the input file. The number of bytes read is put directly
into <tt>avail_in</tt>, and a pointer to those bytes is put into <tt>next_in</tt>. We also
-check to see if end-of-file on the input has been reached. If we are at the end of file, then <tt>flush</tt> is set to the
+check to see if end-of-file on the input has been reached using feof().
+If we are at the end of file, then <tt>flush</tt> is set to the
<em>zlib</em> constant <tt>Z_FINISH</tt>, which is later passed to <tt>deflate()</tt> to
-indicate that this is the last chunk of input data to compress. We need to use <tt>feof()</tt>
-to check for end-of-file as opposed to seeing if fewer than <tt>CHUNK</tt> bytes have been read. The
-reason is that if the input file length is an exact multiple of <tt>CHUNK</tt>, we will miss
-the fact that we got to the end-of-file, and not know to tell <tt>deflate()</tt> to finish
-up the compressed stream. If we are not yet at the end of the input, then the <em>zlib</em>
+indicate that this is the last chunk of input data to compress.
+If we are not yet at the end of the input, then the <em>zlib</em>
constant <tt>Z_NO_FLUSH</tt> will be passed to <tt>deflate</tt> to indicate that we are still
in the middle of the uncompressed data.
<p>
@@ -540,6 +538,12 @@
}
</b></pre>
<hr>
-<i>Copyright (c) 2004, 2005 by Mark Adler<br>Last modified 11 December 2005</i>
+<i>Last modified 24 January 2023<br>
+Copyright © 2004-2023 Mark Adler</i><br>
+<a rel="license" href="http://creativecommons.org/licenses/by-nd/4.0/">
+<img alt="Creative Commons License" style="border-width:0"
+src="https://i.creativecommons.org/l/by-nd/4.0/88x31.png"></a>
+<a rel="license" href="http://creativecommons.org/licenses/by-nd/4.0/">
+Creative Commons Attribution-NoDerivatives 4.0 International License</a>.
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