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

     /*      $NetBSD: xdr_mem.c,v 1.15 2000/01/22 22:19:18 mycroft Exp $     */
     
     /*
      * 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(LIBC_SCCS) && !defined(lint)
    static char *sccsid2 = "@(#)xdr_mem.c 1.19 87/08/11 Copyr 1984 Sun Micro";
    static char *sccsid = "@(#)xdr_mem.c    2.1 88/07/29 4.0 RPCSRC";
    #endif
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    /*
     * 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 <sys/param.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    
    #include <rpc/types.h>
    #include <rpc/xdr.h>
    
    #define memmove(dst, src, len)  bcopy(src, dst, len)
    
    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
    };
    
    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
    };
    
    /*
     * 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)
   {
   
   }
   
   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 = 0;
   
           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, u_int len)
   {
   
           return (0);
   }

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