/***************************************************************************
  *
  * File Name: xdrmem.c
  *
  * Copyright (C) 1993-1996 Hewlett-Packard Company.  
  * All rights reserved.
  *
  * 11311 Chinden Blvd.
  * Boise, Idaho  83714
  *
  * This is a part of the HP JetAdmin Printer Utility
  *
  * This source code is only intended as a supplement for support and 
  * localization of HP JetAdmin by 3rd party Operating System vendors.
  * Modification of source code cannot be made without the express written
  * consent of Hewlett-Packard.
  *
  *	
  * Description: 
  *
  * Author:  Name 
  *        
  *
  * Modification history:
  *
  *     date      initials     change description
  *
  *   mm-dd-yy    MJB     	
  *
  *
  *
  *
  *
  *
  ***************************************************************************/

#include "rpsyshdr.h"
#include "rpcxdr.h"
#include "xdrext.h"

/*
 *  .unsupp/sys/_ became sxu
 *  machine/ became sxm
 *  sys/ became sx
 *  arpa/ became sx
 *  netinet/ became sx
 *  net/ became sx
 *  rpc/ became
 *  auth_ became aut
 *  auth became aut
 *  clnt_ became clnt
 *  nfsv3_ became nfs
 *  nfsv3 became nfs
 *  getrpc became gr
 *  pmap_ became pmap
 *  rpc_ became rpc
 *  svc_ became svc
 *  unix_ became ux
 *  unix became ux
 *  xdr_ became xdr
 *  reference became rf
 *  commondata became cd
 *  tablesize became tsz
 *  get_myaddress became gmyad
 *  bindresvport became brvp
 *  generic became gnc
 *  getmaps became map
 *  getport became port
 *  _prot became pro
 *  prot became pro
 *  simple became simp
 *  callmsg became call
 *  error became err
 *  stdsyms became syms
 *  socket became sock
 *  sysmacros became macs
 *  if_arp became ifarp
 *  errno became ern
 *  ioctl became ioct
 *  signal became sig
 *  param became parm
 *  types became typs
 */
/*
 * 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 or with the express written consent of
 * Sun Microsystems, Inc.
 *
 * 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
 */

/*
 * 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.
 *
 */


#ifdef MANUAL_STATIC_VAR_INIT
static struct xdr_ops ops;
#endif /* MANUAL_STATIC_VAR_INIT */

static struct xdr_ops *xdrmem_ops();

/*
 * Meaning of the private areas of the xdr struct for xdr_mem
 * 	x_base : Base from where the xdr stream starts
 * 	x_private : The current position of the stream.
 * 	x_handy : The size of the stream buffer.
 */

/*
 * The procedure xdrmem_create initializes a stream descriptor for a
 * memory buffer.  
 */
void
xdrmem_create(register XDR *xdrs,
	      caddr_t addr,
	      uint32 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( /*XDR *xdrs*/ )
{
}

static bool_t
xdrmem_getlong(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(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(register XDR *xdrs,
	        caddr_t addr,
	        register u_int len)
{
	if ((xdrs->x_handy -= len) < 0)
		return (FALSE);
	(void) memcpy(addr, xdrs->x_private, len);
	xdrs->x_private += len;
	return (TRUE);
}

static bool_t
xdrmem_putbytes(register XDR *xdrs,
	        caddr_t addr,
	        register u_int len)
{
	if ((xdrs->x_handy -= len) < 0)
		return (FALSE);
	(void) memcpy(xdrs->x_private, addr, len);
	xdrs->x_private += len;
	return (TRUE);
}

static uint32
xdrmem_getpos(register XDR *xdrs)
{
	return ((uint32)xdrs->x_private - (uint32)xdrs->x_base);
}

static bool_t
xdrmem_setpos(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 = (uint32)lastaddr - (uint32)newaddr;
	return (TRUE);
}

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

	if ((xdrs->x_handy >= 0) &&(xdrs->x_handy >= (sint32)len)) {
		xdrs->x_handy -= len;
		buf = (long *) xdrs->x_private;
		xdrs->x_private += len;
	}
	return (buf);
}


#ifdef MANUAL_STATIC_VAR_INIT

/***********************************************************
*
* Function Name:  xdrmem_ops_init()
*
* This function initializes the static struct xdr_ops, ops.
* IT MUST BE RUN AT SYSTEM STARTUP!!!!
*
***********************************************************/
void xdrmem_ops_init(void)
{
  memset(&ops, 0, sizeof(struct xdr_ops));
}

#endif /* MANUAL_STATIC_VAR_INIT */


static struct xdr_ops *
xdrmem_ops()
{
#ifndef MANUAL_STATIC_VAR_INIT
	static struct xdr_ops ops;
#endif /*  not MANUAL_STATIC_VAR_INIT */

	if (ops.x_getlong == NULL) {
		ops.x_getlong = xdrmem_getlong;
		ops.x_putlong = xdrmem_putlong;
		ops.x_getbytes = xdrmem_getbytes;
		ops.x_putbytes = xdrmem_putbytes;
		ops.x_getpostn = xdrmem_getpos;
		ops.x_setpostn = xdrmem_setpos;
		ops.x_inline = xdrmem_inline;
		ops.x_destroy = xdrmem_destroy;
	}
	return (&ops);
}