/* =======================================================================
 * PROGRAMMER "BAHN, William"
 * TITLE      "Integer Storage Size Type Definitions"
 * CREATED    06 FEB 07
 * MODIFIED   06 FEB 07
 * FILENAME   "bytes.c"
 * =======================================================================
 * GENERAL DESCRIPTION
 *
 * NOTE: ANY AVAILABLE "USER GUIDE" IS IN THE ASSOCIATED HEADER FILE.
 *
 * This file contains type definitions so that porting from one processor
 * to another is simpler.
 *
 * =======================================================================
 */

#include "bytes.h"

int VerifyBYTE(void)
{
	return (8*sizeof(BYTE) != BITSinBYTE);
}

int VerifyWORD(void)
{
	return (8*sizeof(WORD) != BITSinWORD);
}

int VerifyDWORD(void)
{
	return (8*sizeof(DWORD) != BITSinDWORD);
}

int VerifyQWORD(void)
{
	return (8*sizeof(QWORD) != BITSinQWORD);
}

unsigned int VerifySIZES(unsigned int maxlength)
{
	unsigned int flags;
	unsigned int mask;

	// Generate a flag vector with a 1 set anyplace that does not 
	// verify properly. Note that the bit position is equal to base-2
	// log of the number of bytes in the integer type.

	flags = 0;
	flags = (flags << 1) + VerifyQWORD();
	flags = (flags << 1) + VerifyDWORD();
	flags = (flags << 1) + VerifyWORD();
	flags = (flags << 1) + VerifyBYTE();

	// Convert length from bits to smallest compatible number of bytes.

	maxlength = (maxlength/8) + ((maxlength%8)?1:0);

	// Generate a mask that is set only in those flag positions of interest.

	if (maxlength) // report on sizes up to and including maxlength.
		for (mask = 0; maxlength > 0; maxlength /= 2)
		{
			mask = (mask << 1) + 1;
			if ((maxlength > 1)&&(maxlength%2))
				mask = (mask << 1) + 1;
		}
	else // report on all defined sizes
		mask = ~0;

	return (flags & mask);
}