lib/libc/xdr/xdr_stdio.c

root/lib/libc/xdr/xdr_stdio.c
/*
 * 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, MERCHANTABILITY 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
 *
 * @(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro
 * @(#)xdr_stdio.c      2.1 88/07/29 4.0 RPCSRC
 * $NetBSD: xdr_stdio.c,v 1.14 2000/01/22 22:19:19 mycroft Exp $
 * $FreeBSD: src/lib/libc/xdr/xdr_stdio.c,v 1.13 2004/10/16 06:32:43 obrien Exp $
 */

/*
 * xdr_stdio.c, XDR implementation on standard i/o file.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 *
 * 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 "namespace.h"
#include <stdio.h>

#include <arpa/inet.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include "un-namespace.h"

static void     xdrstdio_destroy(XDR *);
static bool_t   xdrstdio_getlong(XDR *, long *);
static bool_t   xdrstdio_putlong(XDR *, const long *);
static bool_t   xdrstdio_getbytes(XDR *, char *, u_int);
static bool_t   xdrstdio_putbytes(XDR *, const char *, u_int);
static u_int    xdrstdio_getpos(XDR *);
static bool_t   xdrstdio_setpos(XDR *, u_int);
static int32_t *xdrstdio_inline(XDR *, u_int);

/*
 * Ops vector for stdio type XDR
 */
static const struct xdr_ops     xdrstdio_ops = {
        xdrstdio_getlong,       /* deseraialize a long int */
        xdrstdio_putlong,       /* seraialize 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
};

/*
 * 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 = 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)
{
        fflush((FILE *)xdrs->x_private);
                /* XXX: should we close the file ?? */
}

static bool_t
xdrstdio_getlong(XDR *xdrs, long *lp)
{
        uint32_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, const long *lp)
{
        int32_t mycopy = htonl((uint32_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, char *addr, u_int len)
{

        if ((len != 0) && (fread(addr, (size_t)len, 1, (FILE *)xdrs->x_private) != 1))
                return (FALSE);
        return (TRUE);
}

static bool_t
xdrstdio_putbytes(XDR *xdrs, const char *addr, u_int len)
{

        if ((len != 0) && (fwrite(addr, (size_t)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 ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
                FALSE : TRUE);
}

/* ARGSUSED */
static int32_t *
xdrstdio_inline(XDR *xdrs __unused, u_int len __unused)
{

        /*
         * Must do some work to implement this: must insure
         * 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);
}
DragonflyBSD
