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			fdchecksum32.c
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<pre>
/*====================================================================*
 *
 *   uint32_t fdchecksum32 (int fd, size_t extent, uint32_t checksum);
 *
 *   memory.h
 *
 *   return the 32-bit checksum of a file region starting from the
 *   current file position; extent is specified in bytes but will be
 *   rounded to a multiple of four bytes;
 *
 *   Motley Tools by Charles Maier &lt;cmaier@cmassoc.net&gt;;
 *   Copyright (c) 2001-2006 by Charles Maier Associates;
 *   Licensed under the Internet Software Consortium License;
 *
 *--------------------------------------------------------------------*/

#ifndef FDCHECKSUM32_SOURCE
#define FDCHECKSUM32_SOURCE

#include &lt;stdio.h&gt;
#include &lt;unistd.h&gt;
#include &lt;errno.h&gt;

#include &quot;../tools/memory.h&quot;

uint32_t fdchecksum32 (int fd, register size_t extent, register uint32_t checksum)

{
	uint32_t memory;
	while (extent &gt;= sizeof (memory))
	{
		if (read (fd, &amp;memory, sizeof (memory)) != sizeof (memory))
		{
			return (-1);
		}
		extent -= sizeof (memory);
		checksum ^= memory;
	}
	return (~checksum);
}

#endif


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