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/projects/cubeos/src_current/net/rpc/xdr_mem.c

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/* @(#)xdr_mem.c        2.1 88/07/29 4.0 RPCSRC */
/*
 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
 * unrestricted use provided that this legend is included on all tape
 * media and as a part of the software program in whole or part.  Users
 * may copy or modify Sun RPC without charge, but are not authorized
 * to license or distribute it to anyone else except as part of a product or
 * program developed by the user.
 * 
 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
 * 
 * Sun RPC is provided with no support and without any obligation on the
 * part of Sun Microsystems, Inc. to assist in its use, correction,
 * modification or enhancement.
 * 
 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
 * OR ANY PART THEREOF.
 * 
 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
 * or profits or other special, indirect and consequential damages, even if
 * Sun has been advised of the possibility of such damages.
 * 
 * Sun Microsystems, Inc.
 * 2550 Garcia Avenue
 * Mountain View, California  94043
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * 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>
#include <string.h>             /* CUBEOS: for bcopy */

static bool_t xdrmem_getlong ();
static bool_t xdrmem_putlong ();
static bool_t xdrmem_getbytes ();
static bool_t xdrmem_putbytes ();
static u_int xdrmem_getpos ();
static bool_t xdrmem_setpos ();
static long *xdrmem_inline ();
static 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;
}

static void xdrmem_destroy ( /*xdrs */ )
        /*XDR *xdrs; */
{
}

static 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);
}

static 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);
}

static bool_t
  xdrmem_getbytes (xdrs, addr, len)
     register XDR *xdrs;
     caddr_t addr;
     register u_int len;
{

        if ((xdrs->x_handy -= len) < 0)
                return (FALSE);
        bcopy (xdrs->x_private, addr, len);
        xdrs->x_private += len;
        return (TRUE);
}

static bool_t
  xdrmem_putbytes (xdrs, addr, len)
     register XDR *xdrs;
     caddr_t addr;
     register u_int len;
{

        if ((xdrs->x_handy -= len) < 0)
                return (FALSE);
        bcopy (addr, xdrs->x_private, len);
        xdrs->x_private += len;
        return (TRUE);
}

static u_int
  xdrmem_getpos (xdrs)
     register XDR *xdrs;
{

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

static bool_t
  xdrmem_setpos (xdrs, pos)
     register XDR *xdrs;
     u_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);
}

static long *
  xdrmem_inline (xdrs, len)
     register XDR *xdrs;
     int len;
{
        long *buf = 0;

        if (xdrs->x_handy >= len) {
                xdrs->x_handy -= len;
                buf = (long *) xdrs->x_private;
                xdrs->x_private += len;
        }
        return (buf);
}

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