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/* $OpenBSD: xdr_stdio.c,v 1.17 2022/05/14 05:06:32 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_stdio.c, XDR implementation on standard i/o file.
*
* This set of routines implements a XDR on a stdio stream.
* XDR_ENCODE serializes onto the stream, XDR_DECODE de-serializes
* from the stream.
*/
#include <stdio.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
static bool_t xdrstdio_getlong(XDR *, long *);
static bool_t xdrstdio_putlong(XDR *, long *);
static bool_t xdrstdio_getbytes(XDR *, caddr_t, u_int);
static bool_t xdrstdio_putbytes(XDR *, caddr_t, u_int);
static u_int xdrstdio_getpos(XDR *);
static bool_t xdrstdio_setpos(XDR *, u_int);
static int32_t *xdrstdio_inline(XDR *, u_int);
static void xdrstdio_destroy(XDR *);
/*
* Ops vector for stdio type XDR
*/
static const struct xdr_ops xdrstdio_ops = {
xdrstdio_getlong, /* deserialize a long int */
xdrstdio_putlong, /* serialize a long int */
xdrstdio_getbytes, /* deserialize counted bytes */
xdrstdio_putbytes, /* serialize counted bytes */
xdrstdio_getpos, /* get offset in the stream */
xdrstdio_setpos, /* set offset in the stream */
xdrstdio_inline, /* prime stream for inline macros */
xdrstdio_destroy, /* destroy stream */
NULL, /* xdrstdio_control */
};
/*
* Initialize a stdio xdr stream.
* Sets the xdr stream handle xdrs for use on the stream file.
* Operation flag is set to op.
*/
void
xdrstdio_create(XDR *xdrs, FILE *file, enum xdr_op op)
{
xdrs->x_op = op;
xdrs->x_ops = &xdrstdio_ops;
xdrs->x_private = (caddr_t)file;
xdrs->x_handy = 0;
xdrs->x_base = 0;
}
/*
* Destroy a stdio xdr stream.
* Cleans up the xdr stream handle xdrs previously set up by xdrstdio_create.
*/
static void
xdrstdio_destroy(XDR *xdrs)
{
(void)fflush((FILE *)xdrs->x_private);
/* xx should we close the file ?? */
}
static bool_t
xdrstdio_getlong(XDR *xdrs, long int *lp)
{
u_int32_t temp;
if (fread(&temp, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
return (FALSE);
*lp = (long)ntohl(temp);
return (TRUE);
}
static bool_t
xdrstdio_putlong(XDR *xdrs, long int *lp)
{
int32_t mycopy = htonl((u_int32_t)*lp);
if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)
return (FALSE);
return (TRUE);
}
static bool_t
xdrstdio_getbytes(XDR *xdrs, caddr_t addr, u_int len)
{
if ((len != 0) && (fread(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
return (FALSE);
return (TRUE);
}
static bool_t
xdrstdio_putbytes(XDR *xdrs, caddr_t addr, u_int len)
{
if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
return (FALSE);
return (TRUE);
}
static u_int
xdrstdio_getpos(XDR *xdrs)
{
return ((u_int) ftell((FILE *)xdrs->x_private));
}
static bool_t
xdrstdio_setpos(XDR *xdrs, u_int pos)
{
return ((fseeko((FILE *)xdrs->x_private, pos, SEEK_SET) == -1) ?
FALSE : TRUE);
}
static int32_t *
xdrstdio_inline(XDR *xdrs, u_int len)
{
/*
* Must do some work to implement this: must ensure
* enough data in the underlying stdio buffer,
* that the buffer is aligned so that we can indirect through a
* long *, and stuff this pointer in xdrs->x_buf. Doing
* a fread or fwrite to a scratch buffer would defeat
* most of the gains to be had here and require storage
* management on this buffer, so we don't do this.
*/
return (NULL);
}
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