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/*
* Copyright 1993, University Corporation for Atmospheric Research
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*/
/* $Id: sharray.c,v 1.1.1.1 1998/09/27 01:25:29 phil Exp $ */
#include "local_nc.h"
#include "alloc.h"
/* you may wish to tune this: big on a cray, small on a PC? */
#define NC_SHRT_BUFSIZ 8192
#define NC_NSHRTS_PER (NC_SHRT_BUFSIZ/2) /* number of netshorts the buffer holds */
/*
* internal function, bulk xdr of an even number of shorts, less than NC_NSHRTS_PER
*/
static
bool_t
NCxdr_shortsb(xdrs, sp, nshorts)
XDR *xdrs;
short *sp;
u_int nshorts ;
{
unsigned char buf[NC_SHRT_BUFSIZ] ;
unsigned char *cp ;
unsigned int nbytes = nshorts * 2;
/* assert(nshorts <= NC_NSHRTS_PER) ; */
/* assert(nshorts > 0) ; */
if(xdrs->x_op == XDR_ENCODE)
{
for(cp = buf ; cp < &buf[nbytes] ; sp++, cp += 2 )
{
*(cp +1) = *sp % 256 ;
*cp = (*sp >> 8) ;
}
}
if(!xdr_opaque(xdrs, (caddr_t)buf, nbytes))
return FALSE ;
if(xdrs->x_op == XDR_DECODE)
{
for(cp = buf ; cp < &buf[nbytes] ; sp++, cp += 2 )
{
*sp = ((*cp & 0x7f) << 8) + *(cp +1) ;
if(*cp & 0x80)
{
/* extern is neg */
*sp -= 0x8000 ;
}
}
}
return TRUE ;
}
/*
* Translate an array of cnt short integers at sp.
*/
bool_t
xdr_shorts(xdrs, sp, cnt)
XDR *xdrs;
short *sp;
u_int cnt ;
{
int odd ; /* 1 if cnt is odd, 0 otherwise */
if(cnt == 0)
return TRUE ; /* ? */
odd = cnt % 2 ;
if(odd)
cnt-- ;
/* cnt is even, odd is set if apropos */
while(cnt > NC_NSHRTS_PER)
{
if(!NCxdr_shortsb(xdrs, sp, NC_NSHRTS_PER))
return FALSE ;
/* else */
sp += NC_NSHRTS_PER ;
cnt -= NC_NSHRTS_PER ;
}
/* we know cnt <= NC_NSHRTS_PER at this point */
if(cnt != 0)
{
if(!NCxdr_shortsb(xdrs, sp, cnt))
return FALSE ;
/* else */
sp += cnt ;
cnt = 0 ;
}
if(odd)
if(!xdr_NCvshort(xdrs, 0, sp))
return FALSE ;
return TRUE ;
}
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