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<a name="crc.crc_samples"></a><a class="link" href="crc_samples.html" title="Pre-Defined CRC Samples">Pre-Defined CRC Samples</a>
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<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span>
<span class="special">{</span>
<span class="keyword">typedef</span> <span class="identifier">crc_optimal</span><span class="special">&lt;</span><span class="number">16</span><span class="special">,</span> <span class="number">0x8005</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="keyword">true</span><span class="special">,</span> <span class="keyword">true</span><span class="special">&gt;</span>
<span class="identifier">crc_16_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">crc_optimal</span><span class="special">&lt;</span><span class="number">16</span><span class="special">,</span> <span class="number">0x1021</span><span class="special">,</span> <span class="number">0xFFFF</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="keyword">false</span><span class="special">,</span> <span class="keyword">false</span><span class="special">&gt;</span>
<span class="identifier">crc_ccitt_false_t</span><span class="special">,</span> <span class="identifier">crc_ccitt_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">crc_optimal</span><span class="special">&lt;</span><span class="number">16</span><span class="special">,</span> <span class="number">0x1021</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="keyword">true</span><span class="special">,</span> <span class="keyword">true</span><span class="special">&gt;</span> <span class="identifier">crc_ccitt_true_t</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">crc_optimal</span><span class="special">&lt;</span><span class="number">16</span><span class="special">,</span> <span class="number">0x8408</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="keyword">true</span><span class="special">,</span> <span class="keyword">true</span><span class="special">&gt;</span> <span class="identifier">crc_xmodem_type</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">crc_optimal</span><span class="special">&lt;</span><span class="number">16</span><span class="special">,</span> <span class="number">0x1021</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="number">0</span><span class="special">,</span> <span class="keyword">false</span><span class="special">,</span> <span class="keyword">false</span><span class="special">&gt;</span> <span class="identifier">crc_xmodem_t</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">crc_optimal</span><span class="special">&lt;</span><span class="number">32</span><span class="special">,</span> <span class="number">0x04C11DB7</span><span class="special">,</span> <span class="number">0xFFFFFFFF</span><span class="special">,</span> <span class="number">0xFFFFFFFF</span><span class="special">,</span> <span class="keyword">true</span><span class="special">,</span> <span class="keyword">true</span><span class="special">&gt;</span>
<span class="identifier">crc_32_type</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
Several sample CRC types are given, representing common CRC algorithms. The
samples have now been checked against the <a href="http://regregex.bbcmicro.net/crc-catalogue.htm" target="_top"><span class="emphasis"><em>Catalogue
of parametrised CRC algorithms</em></span></a>, leading to some new type-aliases
corresponding to the corrected profiles. (Older, incorrect profiles keep their
name for backwards compatibility.) However, this library is primarily concerned
with CRC implementation, and not with determining "good" sets of
CRC parameters.
</p>
<div class="table">
<a name="crc.crc_samples.crc_samples_list"></a><p class="title"><b>Table 12.4. Common CRCs</b></p>
<div class="table-contents"><table class="table" summary="Common CRCs">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Computer Type
</p>
</th>
<th>
<p>
Standard(s)
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">crc_16_type</span></code>
</p>
</td>
<td>
<p>
BISYNCH, ARC, LHA, ZOO
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">crc_ccitt_false_t</span></code>
</p>
</td>
<td>
<p>
Commonly misidentified as the standard by CCITT
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">crc_ccitt_type</span></code>
</p>
</td>
<td>
<p>
<code class="computeroutput"><span class="identifier">crc_ccitt_false_t</span></code>
(I made the same mistake.)
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">crc_ccitt_true_t</span></code>
</p>
</td>
<td>
<p>
Designated by CCITT (Comité Consultatif International Télégraphique
et Téléphonique), KERMIT
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">crc_xmodem_type</span></code>
</p>
</td>
<td>
<p>
A mistake I didn't catch in defining <code class="computeroutput"><span class="identifier">crc_xmodem_t</span></code>.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">crc_xmodem_t</span></code>
</p>
</td>
<td>
<p>
XMODEM, ZMODEM, ACORN
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">crc_32_type</span></code>
</p>
</td>
<td>
<p>
ADCCP, PKZip, libPNG, AUTODIN II, Ethernet, FDDI
</p>
</td>
</tr>
</tbody>
</table></div>
</div>
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<td align="right"><div class="copyright-footer">Copyright © 2001, 2003, 2012 Daryle Walker<p>
Distributed under the Boost Software License, Version 1.0. (See the accompanying
file LICENSE_1_0.txt or a copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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