lib/libc/xdr/xdr_mem.c

   1 /*
   2  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3  * unrestricted use provided that this legend is included on all tape
   4  * media and as a part of the software program in whole or part.  Users
   5  * may copy or modify Sun RPC without charge, but are not authorized
   6  * to license or distribute it to anyone else except as part of a product or
   7  * program developed by the user.
   8  *
   9  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12  *
  13  * Sun RPC is provided with no support and without any obligation on the
  14  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15  * modification or enhancement.
  16  *
  17  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19  * OR ANY PART THEREOF.
  20  *
  21  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22  * or profits or other special, indirect and consequential damages, even if
  23  * Sun has been advised of the possibility of such damages.
  24  *
  25  * Sun Microsystems, Inc.
  26  * 2550 Garcia Avenue
  27  * Mountain View, California  94043
  28  *
  29  * @(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro
  30  * @(#)xdr_mem.c        2.1 88/07/29 4.0 RPCSRC
  31  * $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $
  32  * $FreeBSD: src/lib/libc/xdr/xdr_mem.c,v 1.13 2004/10/16 06:32:43 obrien Exp $
  33  * $DragonFly: src/lib/libc/xdr/xdr_mem.c,v 1.4 2005/12/05 00:47:57 swildner Exp $
  34  */
  35
  36 /*
  37  * xdr_mem.h, XDR implementation using memory buffers.
  38  *
  39  * Copyright (C) 1984, Sun Microsystems, Inc.
  40  *
  41  * If you have some data to be interpreted as external data representation
  42  * or to be converted to external data representation in a memory buffer,
  43  * then this is the package for you.
  44  *
  45  */
  46
  47 #include "namespace.h"
  48 #include <sys/types.h>
  49
  50 #include <netinet/in.h>
  51
  52 #include <string.h>
  53
  54 #include <rpc/types.h>
  55 #include <rpc/xdr.h>
  56 #include "un-namespace.h"
  57
  58 static void     xdrmem_destroy(XDR *);
  59 static bool_t   xdrmem_getlong_aligned(XDR *, long *);
  60 static bool_t   xdrmem_putlong_aligned(XDR *, const long *);
  61 static bool_t   xdrmem_getlong_unaligned(XDR *, long *);
  62 static bool_t   xdrmem_putlong_unaligned(XDR *, const long *);
  63 static bool_t   xdrmem_getbytes(XDR *, char *, u_int);
  64 static bool_t   xdrmem_putbytes(XDR *, const char *, u_int);
  65 /* XXX: w/64-bit pointers, u_int not enough! */
  66 static u_int    xdrmem_getpos(XDR *);
  67 static bool_t   xdrmem_setpos(XDR *, u_int);
  68 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
  69 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
  70
  71 static const struct     xdr_ops xdrmem_ops_aligned = {
  72         xdrmem_getlong_aligned,
  73         xdrmem_putlong_aligned,
  74         xdrmem_getbytes,
  75         xdrmem_putbytes,
  76         xdrmem_getpos,
  77         xdrmem_setpos,
  78         xdrmem_inline_aligned,
  79         xdrmem_destroy
  80 };
  81
  82 static const struct     xdr_ops xdrmem_ops_unaligned = {
  83         xdrmem_getlong_unaligned,
  84         xdrmem_putlong_unaligned,
  85         xdrmem_getbytes,
  86         xdrmem_putbytes,
  87         xdrmem_getpos,
  88         xdrmem_setpos,
  89         xdrmem_inline_unaligned,
  90         xdrmem_destroy
  91 };
  92
  93 /*
  94  * The procedure xdrmem_create initializes a stream descriptor for a
  95  * memory buffer.
  96  */
  97 void
  98 xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
  99 {
 100
 101         xdrs->x_op = op;
 102         xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
 103             ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
 104         xdrs->x_private = xdrs->x_base = addr;
 105         xdrs->x_handy = size;
 106 }
 107
 108 /*ARGSUSED*/
 109 static void
 110 xdrmem_destroy(XDR *xdrs)
 111 {
 112
 113 }
 114
 115 static bool_t
 116 xdrmem_getlong_aligned(XDR *xdrs, long *lp)
 117 {
 118
 119         if (xdrs->x_handy < sizeof(int32_t))
 120                 return (FALSE);
 121         xdrs->x_handy -= sizeof(int32_t);
 122         *lp = ntohl(*(u_int32_t *)xdrs->x_private);
 123         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 124         return (TRUE);
 125 }
 126
 127 static bool_t
 128 xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
 129 {
 130
 131         if (xdrs->x_handy < sizeof(int32_t))
 132                 return (FALSE);
 133         xdrs->x_handy -= sizeof(int32_t);
 134         *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
 135         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 136         return (TRUE);
 137 }
 138
 139 static bool_t
 140 xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
 141 {
 142         u_int32_t l;
 143
 144         if (xdrs->x_handy < sizeof(int32_t))
 145                 return (FALSE);
 146         xdrs->x_handy -= sizeof(int32_t);
 147         memmove(&l, xdrs->x_private, sizeof(int32_t));
 148         *lp = ntohl(l);
 149         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 150         return (TRUE);
 151 }
 152
 153 static bool_t
 154 xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
 155 {
 156         u_int32_t l;
 157
 158         if (xdrs->x_handy < sizeof(int32_t))
 159                 return (FALSE);
 160         xdrs->x_handy -= sizeof(int32_t);
 161         l = htonl((u_int32_t)*lp);
 162         memmove(xdrs->x_private, &l, sizeof(int32_t));
 163         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
 164         return (TRUE);
 165 }
 166
 167 static bool_t
 168 xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
 169 {
 170
 171         if (xdrs->x_handy < len)
 172                 return (FALSE);
 173         xdrs->x_handy -= len;
 174         memmove(addr, xdrs->x_private, len);
 175         xdrs->x_private = (char *)xdrs->x_private + len;
 176         return (TRUE);
 177 }
 178
 179 static bool_t
 180 xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
 181 {
 182
 183         if (xdrs->x_handy < len)
 184                 return (FALSE);
 185         xdrs->x_handy -= len;
 186         memmove(xdrs->x_private, addr, len);
 187         xdrs->x_private = (char *)xdrs->x_private + len;
 188         return (TRUE);
 189 }
 190
 191 static u_int
 192 xdrmem_getpos(XDR *xdrs)
 193 {
 194
 195         /* XXX w/64-bit pointers, u_int not enough! */
 196         return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
 197 }
 198
 199 static bool_t
 200 xdrmem_setpos(XDR *xdrs, u_int pos)
 201 {
 202         char *newaddr = xdrs->x_base + pos;
 203         char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
 204
 205         if (newaddr > lastaddr)
 206                 return (FALSE);
 207         xdrs->x_private = newaddr;
 208         xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
 209         return (TRUE);
 210 }
 211
 212 static int32_t *
 213 xdrmem_inline_aligned(XDR *xdrs, u_int len)
 214 {
 215         int32_t *buf = 0;
 216
 217         if (xdrs->x_handy >= len) {
 218                 xdrs->x_handy -= len;
 219                 buf = (int32_t *)xdrs->x_private;
 220                 xdrs->x_private = (char *)xdrs->x_private + len;
 221         }
 222         return (buf);
 223 }
 224
 225 /* ARGSUSED */
 226 static int32_t *
 227 xdrmem_inline_unaligned(XDR *xdrs __unused, u_int len __unused)
 228 {
 229
 230         return (0);
 231 }