popufare/busunit/passdb_slim/byte_access.h

#ifndef BYTE_ACCESS_H
#define BYTE_ACCESS_H

/* Conversion routines for accessing
 * integers (short, long, long long)
 * from a byte array.
 *
 * The viper (gcc I assume) does not
 * allow for non frame aligned access.
 * From what I can tell, it clamps
 * the address to the nearest frame
 * depending on the type you're accessing
 * and reads starting from this position.
 * This leads to misframed data being
 * read if you dereference it from a
 * non framed position.  I would
 * also assume writing has the same problem.
 *
 * These functions will read or write
 * short, long or long long (unsigned)
 * integers starting at the pointer location.
 *
 * Storage is least significant byte first.
 * For example:
 *    _uliw(p, 67305985) would write:
 *
 *    p[0] = 0x01
 *    p[1] = 0x02
 *    p[2] = 0x03
 *    p[3] = 0x04
 *
 *    _uli(p) would return 67305985
 *
 */

unsigned short int _usi(void *p);
unsigned long int _uli(void *p);
unsigned long long int _ulli(void *p);

void _usiw(void *p, unsigned short int usi);
void _uliw(void *p, unsigned long int uli);
void _ulliw(void *p, unsigned long long int ulli);


#endif