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@ -352,56 +352,85 @@ In input, the next byte or bytes must match the checksum.
<h3>Implemented checksum functions</h3>
<dl>
<dt><code>%&lt;SUM&gt;</code> or <code>%&lt;SUM8&gt;</code></dt>
<dt><code>%&lt;sum&gt;</code> or <code>%&lt;sum8&gt;</code></dt>
<dd>One byte. The sum of all characters modulo 2<sup>8</sup>.</dd>
<dt><code>%&lt;SUM16&gt;</code></dt>
<dt><code>%&lt;sum16&gt;</code></dt>
<dd>Two bytes. The sum of all characters modulo 2<sup>16</sup>.</dd>
<dt><code>%&lt;SUM32&gt;</code></dt>
<dt><code>%&lt;sum32&gt;</code></dt>
<dd>Four bytes. The sum of all characters modulo 2<sup>32</sup>.</dd>
<dt><code>%&lt;NEGSUM&gt;</code> or <code>%&lt;NSUM&gt;</code> or <code>%&lt;-SUM&gt;</code></dt>
<dt><code>%&lt;negsum&gt;</code>, <code>%&lt;nsum&gt;</code>, <code>%&lt;-sum&gt;</code>, <code>%&lt;negsum8&gt;</code>, <code>%&lt;nsum8&gt;</code>, or <code>%&lt;-sum8&gt;</code></dt>
<dd>One byte. The negative of the sum of all characters modulo 2<sup>8</sup>.</dd>
<dt><code>%&lt;NOTSUM&gt;</code> or <code>%&lt;~SUM&gt;</code></dt>
<dt><code>%&lt;negsum16&gt;</code>, <code>%&lt;nsum16&gt;</code>, or <code>%&lt;-sum16&gt;</code></dt>
<dd>Two bytes. The negative of the sum of all characters modulo 2<sup>16</sup>.</dd>
<dt><code>%&lt;negsum32&gt;</code>, <code>%&lt;nsum32&gt;</code>, or <code>%&lt;-sum32&gt;</code></dt>
<dd>Four bytes. The negative of the sum of all characters modulo 2<sup>32</sup>.</dd>
<dt><code>%&lt;notsum&gt;</code> or <code>%&lt;~sum&gt;</code></dt>
<dd>One byte. The bitwise inverse of the sum of all characters modulo 2<sup>8</sup>.</dd>
<dt><code>%&lt;XOR&gt;</code></dt>
<dt><code>%&lt;xor&gt;</code></dt>
<dd>One byte. All characters xor'ed.</dd>
<dt><code>%&lt;CRC8&gt;</code></dt>
<dd>One byte. An often used 8 bit CRC checksum
<dt><code>%&lt;xor7&gt;</code></dt>
<dd>One byte. All characters xor'ed &amp; 0x7F.</dd>
<dt><code>%&lt;crc8&gt;</code></dt>
<dd>One byte. An often used 8 bit crc checksum
(poly=0x07, init=0x00, xorout=0x00).</dd>
<dt><code>%&lt;CCITT8&gt;</code></dt>
<dd>One byte. The CCITT standard 8 bit CRC checksum
<dt><code>%&lt;ccitt8&gt;</code></dt>
<dd>One byte. The CCITT standard 8 bit crc checksum
(poly=0x31, init=0x00, xorout=0x00).</dd>
<dt><code>%&lt;CRC16&gt;</code></dt>
<dd>Two bytes. An often used 16 bit CRC checksum
<dt><code>%&lt;crc16&gt;</code></dt>
<dd>Two bytes. An often used 16 bit crc checksum
(poly=0x8005, init=0x0000, xorout=0x0000).</dd>
<dt><code>%&lt;CRC16R&gt;</code></dt>
<dd>Two bytes. An often used reflected 16 bit CRC checksum
<dt><code>%&lt;crc16r&gt;</code></dt>
<dd>Two bytes. An often used reflected 16 bit crc checksum
(poly=0x8005, init=0x0000, xorout=0x0000).</dd>
<dt><code>%&lt;CCITT16&gt;</code></dt>
<dt><code>%&lt;ccitt16&gt;</code></dt>
<dd>Two bytes. The usual (but <a target="ex"
href="http://www.joegeluso.com/software/articles/ccitt.htm">wrong?</a>)
implementation of the CCITT standard 16 bit CRC checksum
implementation of the CCITT standard 16 bit crc checksum
(poly=0x1021, init=0xFFFF, xorout=0x0000).</dd>
<dt><code>%&lt;CCITT16A&gt;</code></dt>
<dt><code>%&lt;ccitt16a&gt;</code></dt>
<dd>Two bytes. The unusual (but <a target="ex"
href="http://www.joegeluso.com/software/articles/ccitt.htm">correct?</a>)
implementation of the CCITT standard 16 bit CRC checksum with augment.
implementation of the CCITT standard 16 bit crc checksum with augment.
(poly=0x1021, init=0x1D0F, xorout=0x0000).</dd>
<dt><code>%&lt;CRC32&gt;</code></dt>
<dd>Four bytes. The standard 32 bit CRC checksum.
<dt><code>%&lt;crc32&gt;</code></dt>
<dd>Four bytes. The standard 32 bit crc checksum.
(poly=0x04C11DB7, init=0xFFFFFFFF, xorout=0xFFFFFFFF).</dd>
<dt><code>%&lt;CRC32R&gt;</code></dt>
<dd>Four bytes. The standard reflected 32 bit CRC checksum.
<dt><code>%&lt;crc32r&gt;</code></dt>
<dd>Four bytes. The standard reflected 32 bit crc checksum.
(poly=0x04C11DB7, init=0xFFFFFFFF, xorout=0xFFFFFFFF).</dd>
<dt><code>%&lt;JAMCRC&gt;</code></dt>
<dd>Four bytes. Another reflected 32 bit CRC checksum.
<dt><code>%&lt;jamcrc&gt;</code></dt>
<dd>Four bytes. Another reflected 32 bit crc checksum.
(poly=0x04C11DB7, init=0xFFFFFFFF, xorout=0x00000000).</dd>
<dt><code>%&lt;ADLER32&gt;</code></dt>
<dt><code>%&lt;adler32&gt;</code></dt>
<dd>Four bytes. The Adler32 checksum according to <a target="ex"
href="http://www.ietf.org/rfc/rfc1950.txt">RFC 1950</a>.</dd>
<dt><code>%&lt;HEXSUM8&gt;</code></dt>
<dt><code>%&lt;hexsum8&gt;</code></dt>
<dd>One byte. The sum of all hex digits. (Other characters are ignored.)</dd>
</dl>
<a name="regex"></a>
<h2>12. Regular Expresion STRING Converter (<code>%/<em>regex</em>/</code>)</h2>
<p>
This input-only format matches <a target="ex"
href="http://www.pcre.org/" >Perl compatible regular expressions (PCRE)</a>.
It is only available if a PCRE library is installed and the RELEASE
file contains the variable <code>PCRE</code> which should point to the
install location.
If the regular expression is not anchored, i.e. does not start with
<code>^</code>, leading non-matching input is skipped.
A maximum of <em>width</em> bytes is matched, if specified.
If <em>prec</em> is given, it specifies the sub-expression whose match
is retuned.
Otherwise the complete match is returned.
In any case, the complete match is consumed from the input buffer.
If the expression contains a <code>/</code> is must be escaped.
</p>
<p>
Example: <code>%.1/&lt;title&gt;(.*)&lt;\/title&gt;/</code> returns
the title of an HTML page, skipps anything before the
<code>&lt;title&gt</code> tag and leaves anything after the
<code>&lt;/title&gt;</code> tag in the input buffer.
</p>
<hr>
<p align="right"><a href="processing.html">Next: Record Processing</a></p>
<p><small>Dirk Zimoch, 2007</small></p>