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/*
* *********************************************************************
* * Copyright (C) 1988, 1990 Stanford University. *
* * Permission to use, copy, modify, and distribute this *
* * software and its documentation for any purpose and without *
* * fee is hereby granted, provided that the above copyright *
* * notice appear in all copies. Stanford University *
* * makes no representations about the suitability of this *
* * software for any purpose. It is provided "as is" without *
* * express or implied warranty. Export of this software outside *
* * of the United States of America may require an export license. *
* *********************************************************************
*/
/*
* Macros to read/write machine-independent binary files.
*/
/*
* Extract NBYTES from byte stream BUFF and place result in NUM.
* Restriction is 1 <= NBYTES <= 4. (Force Unrolling of loops).
*/
#define UnpackBytes( BUFF, NUM, NBYTES ) \
{ \
register unsigned char *B_S = (unsigned char *) (BUFF); \
register unsigned long RES = 0; \
\
if( NBYTES == 1 ) \
RES = *B_S; \
else if( NBYTES == 2 ) \
{ \
RES = B_S[0]; \
RES += ( ((unsigned int) B_S[1]) << 8 ) & 0x0ff00; \
} \
else if( NBYTES == 3 ) \
{ \
RES = B_S[0]; \
RES += ( ((unsigned int) B_S[1]) << 8 ) & 0x0ff00; \
RES += ( ((unsigned int) B_S[2]) << 16 ) & 0x0ff0000; \
} \
else if( NBYTES == 4 ) \
{ \
RES = B_S[0]; \
RES += ( ((unsigned int) B_S[1]) << 8 ) & 0x0ff00; \
RES += ( ((unsigned int) B_S[2]) << 16 ) & 0x0ff0000; \
RES += ( ((unsigned int) B_S[3]) << 24 ) & 0xff000000; \
} \
NUM = RES; \
} \
/*
* Pack NBYTES from NUM into byte stream pointed to by BUFF.
* Restriction is 1 <= NBYTES <= 4. (Force Unrolling of loops).
*/
#define PackBytes( BUFF, NUM, NBYTES ) \
{ \
register unsigned long B_T = (NUM); \
register unsigned char *B_S = (unsigned char *) (BUFF); \
\
if( NBYTES > 3 ) \
{ \
*B_S++ = B_T & 0x0ff; \
B_T >>= 8; \
} \
if( NBYTES > 2 ) \
{ \
*B_S++ = B_T & 0x0ff; \
B_T >>= 8; \
} \
if( NBYTES > 1 ) \
{ \
*B_S++ = B_T & 0x0ff; \
B_T >>= 8; \
} \
*B_S = B_T & 0x0ff; \
} \
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