source: rtems-libbsd/freebsd/lib/libc/xdr/xdr_mem.c @ f41a394

#include <machine/rtems-bsd-user-space.h>

/*      $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 "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
};

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(xdrs, addr, size, op)
        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(xdrs)
        XDR *xdrs;
{

}

static bool_t
xdrmem_getlong_aligned(xdrs, lp)
        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(xdrs, lp)
        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(xdrs, lp)
        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(xdrs, lp)
        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(xdrs, addr, len)
        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(xdrs, addr, len)
        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(xdrs)
        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(xdrs, pos)
        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(xdrs, len)
        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(xdrs, len)
        XDR *xdrs;
        u_int len;
{

        return (0);
}