text: /*
   * 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
   *
   * @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro
   * @(#)xdr_mem.c	2.1 88/07/29 4.0 RPCSRC
   * $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $
   * $FreeBSD: src/lib/libc/xdr/xdr_mem.c,v 1.13 2004/10/16 06:32:43 obrien Exp $
   */
  
  /*
   * 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 "namespace.h"
  #include <sys/types.h>
  
  #include <netinet/in.h>
  
  #include <string.h>
  
  #include <rpc/types.h>
  #include <rpc/xdr.h>
  #include "un-namespace.h"
  
  static void	xdrmem_destroy(XDR *);
  static bool_t	xdrmem_getlong_aligned(XDR *, long *);
  static bool_t	xdrmem_putlong_aligned(XDR *, const long *);
  static bool_t	xdrmem_getlong_unaligned(XDR *, long *);
  static bool_t	xdrmem_putlong_unaligned(XDR *, const long *);
  static bool_t	xdrmem_getbytes(XDR *, char *, u_int);
  static bool_t	xdrmem_putbytes(XDR *, const char *, u_int);
  /* XXX: w/64-bit pointers, u_int not enough! */
  static u_int	xdrmem_getpos(XDR *);
  static bool_t	xdrmem_setpos(XDR *, u_int);
  static int32_t *xdrmem_inline_aligned(XDR *, u_int);
  static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
  
  static const struct	xdr_ops xdrmem_ops_aligned = {
  	xdrmem_getlong_aligned,
  	xdrmem_putlong_aligned,
  	xdrmem_getbytes,
  	xdrmem_putbytes,
  	xdrmem_getpos,
  	xdrmem_setpos,
  	xdrmem_inline_aligned,
  	xdrmem_destroy,
  	NULL
  };
  
  static const struct	xdr_ops xdrmem_ops_unaligned = {
  	xdrmem_getlong_unaligned,
  	xdrmem_putlong_unaligned,
  	xdrmem_getbytes,
  	xdrmem_putbytes,
  	xdrmem_getpos,
  	xdrmem_setpos,
  	xdrmem_inline_unaligned,
  	xdrmem_destroy,
  	NULL
  };
  
  /*
   * The procedure xdrmem_create initializes a stream descriptor for a
   * memory buffer.
   */
  void
  xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
  {
  
  	xdrs->x_op = op;
  	xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
  	    ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
  	xdrs->x_private = xdrs->x_base = addr;
  	xdrs->x_handy = size;
  }
  
  /*ARGSUSED*/
  static void
  xdrmem_destroy(XDR *xdrs __unused)
  {
  
  }
  
  static bool_t
  xdrmem_getlong_aligned(XDR *xdrs, long *lp)
  {
  
  	if (xdrs->x_handy < sizeof(int32_t))
  		return (FALSE);
  	xdrs->x_handy -= sizeof(int32_t);
  	*lp = ntohl(*(u_int32_t *)xdrs->x_private);
  	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
  	return (TRUE);
  }
  
  static bool_t
  xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
  {
  
  	if (xdrs->x_handy < sizeof(int32_t))
  		return (FALSE);
  	xdrs->x_handy -= sizeof(int32_t);
  	*(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
  	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
  	return (TRUE);
  }
  
  static bool_t
  xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
  {
  	u_int32_t l;
  
  	if (xdrs->x_handy < sizeof(int32_t))
  		return (FALSE);
  	xdrs->x_handy -= sizeof(int32_t);
  	memmove(&l, xdrs->x_private, sizeof(int32_t));
  	*lp = ntohl(l);
  	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
  	return (TRUE);
  }
  
  static bool_t
  xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
  {
  	u_int32_t l;
  
  	if (xdrs->x_handy < sizeof(int32_t))
  		return (FALSE);
  	xdrs->x_handy -= sizeof(int32_t);
  	l = htonl((u_int32_t)*lp);
  	memmove(xdrs->x_private, &l, sizeof(int32_t));
  	xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
  	return (TRUE);
  }
  
  static bool_t
  xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
  {
  
  	if (xdrs->x_handy < len)
  		return (FALSE);
  	xdrs->x_handy -= len;
  	memmove(addr, xdrs->x_private, len);
  	xdrs->x_private = (char *)xdrs->x_private + len;
  	return (TRUE);
  }
  
  static bool_t
  xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
  {
  
  	if (xdrs->x_handy < len)
  		return (FALSE);
  	xdrs->x_handy -= len;
  	memmove(xdrs->x_private, addr, len);
  	xdrs->x_private = (char *)xdrs->x_private + len;
  	return (TRUE);
  }
  
  static u_int
  xdrmem_getpos(XDR *xdrs)
  {
  
  	/* XXX w/64-bit pointers, u_int not enough! */
  	return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
  }
  
  static bool_t
  xdrmem_setpos(XDR *xdrs, u_int pos)
  {
  	char *newaddr = xdrs->x_base + pos;
  	char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
  
  	if (newaddr > lastaddr)
  		return (FALSE);
  	xdrs->x_private = newaddr;
  	xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
  	return (TRUE);
  }
  
  static int32_t *
  xdrmem_inline_aligned(XDR *xdrs, u_int len)
  {
  	int32_t *buf = NULL;
  
  	if (xdrs->x_handy >= len) {
  		xdrs->x_handy -= len;
  		buf = (int32_t *)xdrs->x_private;
  		xdrs->x_private = (char *)xdrs->x_private + len;
  	}
  	return (buf);
  }
  
  /* ARGSUSED */
  static int32_t *
  xdrmem_inline_unaligned(XDR *xdrs __unused, u_int len __unused)
  {
  
  	return (0);
  }
  