/*      $NetBSD: xdr_mem.c,v 1.2 2019/06/05 16:25:43 hannken Exp $      */

/*
* Copyright (c) 2010, Oracle America, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
*     * Redistributions of source code must retain the above copyright
*       notice, this list of conditions and the following disclaimer.
*     * Redistributions in binary form must reproduce the above
*       copyright notice, this list of conditions and the following
*       disclaimer in the documentation and/or other materials
*       provided with the distribution.
*     * Neither the name of the "Oracle America, Inc." nor the names of its
*       contributors may be used to endorse or promote products derived
*       from this software without specific prior written permission.
*
*   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
*   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
*   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
*   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
*   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
*   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
*   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
*   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
*   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
*   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
*   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
*   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char *sccsid = "@(#)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";
#else
__RCSID("$NetBSD: xdr_mem.c,v 1.2 2019/06/05 16:25:43 hannken Exp $");
#endif
#endif

/*
* 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.
*
*/

#if defined(_KERNEL) || defined(_STANDALONE)

#include <lib/libkern/libkern.h>
#include <rpc/types.h>
#include <rpc/xdr.h>

#else /* _KERNEL || _STANDALONE */

#include "namespace.h"

#include <sys/types.h>

#include <netinet/in.h>

#include <string.h>

#include <rpc/types.h>
#include <rpc/xdr.h>

#ifdef __weak_alias
__weak_alias(xdrmem_create,_xdrmem_create)
#endif

#endif /* _KERNEL || _STANDALONE */

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 bool_t xdrmem_control(XDR *xdrs, int request, void *info);

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,
       xdrmem_control
};

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,
       xdrmem_control
};

/*
* 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 ((long)newaddr > (long)lastaddr)
               return (FALSE);
       xdrs->x_private = newaddr;
       xdrs->x_handy = (int)((long)lastaddr - (long)newaddr);
       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);
}

static bool_t
xdrmem_control(XDR *xdrs, int request, void *info)
{
       xdr_bytesrec *xptr;

       switch (request) {

       case XDR_GET_BYTES_AVAIL:
               xptr = (xdr_bytesrec *)info;
               xptr->xc_is_last_record = TRUE;
               xptr->xc_num_avail = xdrs->x_handy;
               return (TRUE);

       }
       return (FALSE);
}

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