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/* $OpenBSD: xdr_mem.c,v 1.18 2022/02/14 03:38:59 guenther 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.
*/
/*
* xdr_mem.h, XDR implementation using memory buffers.
*
* 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/types.h>
#include <netinet/in.h>
#include <string.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
static bool_t xdrmem_getlong_aligned(XDR *, long *);
static bool_t xdrmem_putlong_aligned(XDR *, long *);
static bool_t xdrmem_getlong_unaligned(XDR *, long *);
static bool_t xdrmem_putlong_unaligned(XDR *, long *);
static bool_t xdrmem_getbytes(XDR *, caddr_t, u_int);
static bool_t xdrmem_putbytes(XDR *, caddr_t, u_int);
static u_int xdrmem_getpos(XDR *); /* XXX w/64-bit pointers, u_int not enough! */
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 void xdrmem_destroy(XDR *);
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,
NULL, /* 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,
NULL, /* xdrmem_control */
};
/*
* The procedure xdrmem_create initializes a stream descriptor for a
* memory buffer.
*/
void
xdrmem_create(XDR *xdrs, caddr_t addr, u_int size, enum xdr_op op)
{
xdrs->x_op = op;
xdrs->x_ops = ((size_t)addr & (sizeof(int32_t) - 1))
? &xdrmem_ops_unaligned : &xdrmem_ops_aligned;
xdrs->x_private = xdrs->x_base = addr;
xdrs->x_handy = size;
}
DEF_WEAK(xdrmem_create);
static void
xdrmem_destroy(XDR *xdrs)
{
}
static bool_t
xdrmem_getlong_aligned(XDR *xdrs, long int *lp)
{
if (xdrs->x_handy < sizeof(int32_t))
return (FALSE);
xdrs->x_handy -= sizeof(int32_t);
*lp = ntohl(*(int32_t *)xdrs->x_private);
xdrs->x_private += sizeof(int32_t);
return (TRUE);
}
static bool_t
xdrmem_putlong_aligned(XDR *xdrs, long int *lp)
{
if (xdrs->x_handy < sizeof(int32_t))
return (FALSE);
xdrs->x_handy -= sizeof(int32_t);
*(int32_t *)xdrs->x_private = htonl((u_int32_t)*lp);
xdrs->x_private += sizeof(int32_t);
return (TRUE);
}
static bool_t
xdrmem_getlong_unaligned(XDR *xdrs, long int *lp)
{
int32_t l;
if (xdrs->x_handy < sizeof(int32_t))
return (FALSE);
xdrs->x_handy -= sizeof(int32_t);
memcpy(&l, xdrs->x_private, sizeof(int32_t));
*lp = ntohl(l);
xdrs->x_private += sizeof(int32_t);
return (TRUE);
}
static bool_t
xdrmem_putlong_unaligned(XDR *xdrs, long int *lp)
{
int32_t l;
if (xdrs->x_handy < sizeof(int32_t))
return (FALSE);
xdrs->x_handy -= sizeof(int32_t);
l = htonl((u_int32_t)*lp);
memcpy(xdrs->x_private, &l, sizeof(int32_t));
xdrs->x_private += sizeof(int32_t);
return (TRUE);
}
static bool_t
xdrmem_getbytes(XDR *xdrs, caddr_t addr, u_int len)
{
if (xdrs->x_handy < len)
return (FALSE);
xdrs->x_handy -= len;
memcpy(addr, xdrs->x_private, len);
xdrs->x_private += len;
return (TRUE);
}
static bool_t
xdrmem_putbytes(XDR *xdrs, caddr_t addr, u_int len)
{
if (xdrs->x_handy < len)
return (FALSE);
xdrs->x_handy -= len;
memcpy(xdrs->x_private, addr, len);
xdrs->x_private += len;
return (TRUE);
}
static u_int
xdrmem_getpos(XDR *xdrs)
{
/* XXX w/64-bit pointers, u_int not enough! */
return ((u_long)xdrs->x_private - (u_long)xdrs->x_base);
}
static bool_t
xdrmem_setpos(XDR *xdrs, u_int pos)
{
caddr_t newaddr = xdrs->x_base + pos;
caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;
if (newaddr > lastaddr)
return (FALSE);
xdrs->x_private = newaddr;
xdrs->x_handy = (u_int)(lastaddr - newaddr); /* XXX w/64-bit pointers, u_int not enough! */
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 += len;
}
return (buf);
}
static int32_t *
xdrmem_inline_unaligned(XDR *xdrs, u_int len)
{
return (0);
}
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