The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xdr/xdr_mem.c

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    1 /*      $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $     */
    2 
    3 /*
    4  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
    5  * unrestricted use provided that this legend is included on all tape
    6  * media and as a part of the software program in whole or part.  Users
    7  * may copy or modify Sun RPC without charge, but are not authorized
    8  * to license or distribute it to anyone else except as part of a product or
    9  * program developed by the user.
   10  *
   11  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
   12  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
   13  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
   14  *
   15  * Sun RPC is provided with no support and without any obligation on the
   16  * part of Sun Microsystems, Inc. to assist in its use, correction,
   17  * modification or enhancement.
   18  *
   19  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
   20  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
   21  * OR ANY PART THEREOF.
   22  *
   23  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
   24  * or profits or other special, indirect and consequential damages, even if
   25  * Sun has been advised of the possibility of such damages.
   26  *
   27  * Sun Microsystems, Inc.
   28  * 2550 Garcia Avenue
   29  * Mountain View, California  94043
   30  */
   31 
   32 #if defined(LIBC_SCCS) && !defined(lint)
   33 static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
   34 static char *sccsid = "@(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";
   35 #endif
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: stable/12/sys/xdr/xdr_mem.c 297975 2016-04-14 17:06:37Z pfg $");
   38 
   39 /*
   40  * xdr_mem.h, XDR implementation using memory buffers.
   41  *
   42  * Copyright (C) 1984, Sun Microsystems, Inc.
   43  *
   44  * If you have some data to be interpreted as external data representation
   45  * or to be converted to external data representation in a memory buffer,
   46  * then this is the package for you.
   47  *
   48  */
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/malloc.h>
   53 
   54 #include <rpc/types.h>
   55 #include <rpc/xdr.h>
   56 
   57 static void xdrmem_destroy(XDR *);
   58 static bool_t xdrmem_getlong_aligned(XDR *, long *);
   59 static bool_t xdrmem_putlong_aligned(XDR *, const long *);
   60 static bool_t xdrmem_getlong_unaligned(XDR *, long *);
   61 static bool_t xdrmem_putlong_unaligned(XDR *, const long *);
   62 static bool_t xdrmem_getbytes(XDR *, char *, u_int);
   63 static bool_t xdrmem_putbytes(XDR *, const char *, u_int);
   64 /* XXX: w/64-bit pointers, u_int not enough! */
   65 static u_int xdrmem_getpos(XDR *);
   66 static bool_t xdrmem_setpos(XDR *, u_int);
   67 static int32_t *xdrmem_inline_aligned(XDR *, u_int);
   68 static int32_t *xdrmem_inline_unaligned(XDR *, u_int);
   69 static bool_t xdrmem_control(XDR *xdrs, int request, void *info);
   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         xdrmem_control
   81 };
   82 
   83 static const struct     xdr_ops xdrmem_ops_unaligned = {
   84         xdrmem_getlong_unaligned,
   85         xdrmem_putlong_unaligned,
   86         xdrmem_getbytes,
   87         xdrmem_putbytes,
   88         xdrmem_getpos,
   89         xdrmem_setpos,
   90         xdrmem_inline_unaligned,
   91         xdrmem_destroy,
   92         xdrmem_control
   93 };
   94 
   95 /*
   96  * The procedure xdrmem_create initializes a stream descriptor for a
   97  * memory buffer.
   98  */
   99 void
  100 xdrmem_create(XDR *xdrs, char *addr, u_int size, enum xdr_op op)
  101 {
  102 
  103         xdrs->x_op = op;
  104         xdrs->x_ops = ((unsigned long)addr & (sizeof(int32_t) - 1))
  105             ? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
  106         xdrs->x_private = xdrs->x_base = addr;
  107         xdrs->x_handy = size;
  108 }
  109 
  110 /*ARGSUSED*/
  111 static void
  112 xdrmem_destroy(XDR *xdrs)
  113 {
  114 
  115 }
  116 
  117 static bool_t
  118 xdrmem_getlong_aligned(XDR *xdrs, long *lp)
  119 {
  120 
  121         if (xdrs->x_handy < sizeof(int32_t))
  122                 return (FALSE);
  123         xdrs->x_handy -= sizeof(int32_t);
  124         *lp = ntohl(*(u_int32_t *)xdrs->x_private);
  125         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
  126         return (TRUE);
  127 }
  128 
  129 static bool_t
  130 xdrmem_putlong_aligned(XDR *xdrs, const long *lp)
  131 {
  132 
  133         if (xdrs->x_handy < sizeof(int32_t))
  134                 return (FALSE);
  135         xdrs->x_handy -= sizeof(int32_t);
  136         *(u_int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
  137         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
  138         return (TRUE);
  139 }
  140 
  141 static bool_t
  142 xdrmem_getlong_unaligned(XDR *xdrs, long *lp)
  143 {
  144         u_int32_t l;
  145 
  146         if (xdrs->x_handy < sizeof(int32_t))
  147                 return (FALSE);
  148         xdrs->x_handy -= sizeof(int32_t);
  149         memmove(&l, xdrs->x_private, sizeof(int32_t));
  150         *lp = ntohl(l);
  151         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
  152         return (TRUE);
  153 }
  154 
  155 static bool_t
  156 xdrmem_putlong_unaligned(XDR *xdrs, const long *lp)
  157 {
  158         u_int32_t l;
  159 
  160         if (xdrs->x_handy < sizeof(int32_t))
  161                 return (FALSE);
  162         xdrs->x_handy -= sizeof(int32_t);
  163         l = htonl((u_int32_t)*lp);
  164         memmove(xdrs->x_private, &l, sizeof(int32_t));
  165         xdrs->x_private = (char *)xdrs->x_private + sizeof(int32_t);
  166         return (TRUE);
  167 }
  168 
  169 static bool_t
  170 xdrmem_getbytes(XDR *xdrs, char *addr, u_int len)
  171 {
  172 
  173         if (xdrs->x_handy < len)
  174                 return (FALSE);
  175         xdrs->x_handy -= len;
  176         memmove(addr, xdrs->x_private, len);
  177         xdrs->x_private = (char *)xdrs->x_private + len;
  178         return (TRUE);
  179 }
  180 
  181 static bool_t
  182 xdrmem_putbytes(XDR *xdrs, const char *addr, u_int len)
  183 {
  184 
  185         if (xdrs->x_handy < len)
  186                 return (FALSE);
  187         xdrs->x_handy -= len;
  188         memmove(xdrs->x_private, addr, len);
  189         xdrs->x_private = (char *)xdrs->x_private + len;
  190         return (TRUE);
  191 }
  192 
  193 static u_int
  194 xdrmem_getpos(XDR *xdrs)
  195 {
  196 
  197         /* XXX w/64-bit pointers, u_int not enough! */
  198         return (u_int)((u_long)xdrs->x_private - (u_long)xdrs->x_base);
  199 }
  200 
  201 static bool_t
  202 xdrmem_setpos(XDR *xdrs, u_int pos)
  203 {
  204         char *newaddr = xdrs->x_base + pos;
  205         char *lastaddr = (char *)xdrs->x_private + xdrs->x_handy;
  206 
  207         if (newaddr > lastaddr)
  208                 return (FALSE);
  209         xdrs->x_private = newaddr;
  210         xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX sizeof(u_int) <? sizeof(ptrdiff_t) */
  211         return (TRUE);
  212 }
  213 
  214 static int32_t *
  215 xdrmem_inline_aligned(XDR *xdrs, u_int len)
  216 {
  217         int32_t *buf = NULL;
  218 
  219         if (xdrs->x_handy >= len) {
  220                 xdrs->x_handy -= len;
  221                 buf = (int32_t *)xdrs->x_private;
  222                 xdrs->x_private = (char *)xdrs->x_private + len;
  223         }
  224         return (buf);
  225 }
  226 
  227 /* ARGSUSED */
  228 static int32_t *
  229 xdrmem_inline_unaligned(XDR *xdrs, u_int len)
  230 {
  231 
  232         return (0);
  233 }
  234 
  235 static bool_t
  236 xdrmem_control(XDR *xdrs, int request, void *info)
  237 {
  238         xdr_bytesrec *xptr;
  239         int32_t *l;
  240         int len;
  241 
  242         switch (request) {
  243 
  244         case XDR_GET_BYTES_AVAIL:
  245                 xptr = (xdr_bytesrec *)info;
  246                 xptr->xc_is_last_record = TRUE;
  247                 xptr->xc_num_avail = xdrs->x_handy;
  248                 return (TRUE);
  249 
  250         case XDR_PEEK:
  251                 /*
  252                  * Return the next 4 byte unit in the XDR stream.
  253                  */
  254                 if (xdrs->x_handy < sizeof (int32_t))
  255                         return (FALSE);
  256                 l = (int32_t *)info;
  257                 *l = (int32_t)ntohl((uint32_t)
  258                     (*((int32_t *)(xdrs->x_private))));
  259                 return (TRUE);
  260 
  261         case XDR_SKIPBYTES:
  262                 /*
  263                  * Skip the next N bytes in the XDR stream.
  264                  */
  265                 l = (int32_t *)info;
  266                 len = RNDUP((int)(*l));
  267                 if (xdrs->x_handy < len)
  268                         return (FALSE);
  269                 xdrs->x_handy -= len;
  270                 xdrs->x_private = (char *)xdrs->x_private + len;
  271                 return (TRUE);
  272 
  273         }
  274         return (FALSE);
  275 }

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