/*
 * xdr_mem.h, XDR implementation using memory buffers.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * If you have some data to be interpreted as external data representation
 * or to be converted to external data representation in a memory buffer,
 * then this is the package for you.
 *
 */

#include <rpc/types.h>
#include <rpc/xdr.h>
#include <netinet/in.h>

bool_t	Xdrmem_getlong();
bool_t	Xdrmem_putlong();
bool_t	Xdrmem_getbytes();
bool_t	Xdrmem_putbytes();
u_int	Xdrmem_getpos();
bool_t	Xdrmem_setpos();
long *	Xdrmem_inline();
void	Xdrmem_destroy();

static struct	xdr_ops Xdrmem_ops = {
	Xdrmem_getlong,
	Xdrmem_putlong,
	Xdrmem_getbytes,
	Xdrmem_putbytes,
	Xdrmem_getpos,
	Xdrmem_setpos,
	Xdrmem_inline,
	Xdrmem_destroy
};


/*
 * The procedure xdrmem_create initializes a stream descriptor for a
 * memory buffer.  
 */
void
Xdrmem_create(xdrs, addr, size, op)
	register XDR *xdrs;
	caddr_t addr;
	u_int size;
        enum xdr_op op;
{
	xdrs->x_op = op;
	xdrs->x_ops = &Xdrmem_ops;
	xdrs->x_private = xdrs->x_base = addr;
        xdrs->x_handy = size;
}

void
Xdrmem_destroy(/*xdrs*/)
	/*XDR *xdrs;*/
{
}

 bool_t
Xdrmem_getlong(xdrs, lp)
	register XDR *xdrs;
	long *lp;
{
        if ((xdrs->x_handy -= sizeof(long)) < 0)
          return (FALSE);

	*lp = (long)ntohl((u_long)(*((long *)(xdrs->x_private))));
	xdrs->x_private += sizeof(long);
	return (TRUE);
}

bool_t
Xdrmem_putlong(xdrs, lp)
	register XDR *xdrs;
	long *lp;
{
	if ((xdrs->x_handy -= sizeof(long)) < 0)
		return (FALSE);
	*(long *)xdrs->x_private = (long)htonl((u_long)(*lp));
	xdrs->x_private += sizeof(long);
	return (TRUE);
}


 u_int
Xdrmem_getpos(xdrs)
	register XDR *xdrs;
{

	return ((u_int)xdrs->x_private - (u_int)xdrs->x_base);
}

bool_t
Xdrmem_setpos(xdrs, pos)
	register XDR *xdrs;
	int pos;
{
	register caddr_t newaddr = xdrs->x_base + pos;
	register caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
	if ((long)newaddr > (long)lastaddr)
		return (FALSE);
	xdrs->x_private = newaddr;
	xdrs->x_handy = (int)lastaddr - (int)newaddr;
	return (TRUE);
}