/*

 * Copyright (c) 2009, Sun Microsystems, Inc.

 * All rights reserved.

 *

 * 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 Sun Microsystems, 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.

 *

 * 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 <stdio.h>

#include <stdint.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 */

};

/*

 * 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(xdrs, file, op)

	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(xdrs)

	XDR *xdrs;

{

	(void)fflush((FILE *)xdrs->x_private);

		/* XXX: should we close the file ?? */

}

static bool_t

xdrstdio_getlong(xdrs, lp)

	XDR *xdrs;

	long *lp;

{

	int32_t mycopy;

	if (fread(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)

		return (FALSE);

	*lp = (long)ntohl(mycopy);

	return (TRUE);

}

static bool_t

xdrstdio_putlong(xdrs, lp)

	XDR *xdrs;

	const long *lp;

{

	int32_t mycopy;

#if defined(_LP64)

	if ((*lp > UINT32_MAX) || (*lp < INT32_MIN))

		return (FALSE);

#endif

	mycopy = (int32_t)htonl((int32_t)*lp);

	if (fwrite(&mycopy, sizeof(int32_t), 1, (FILE *)xdrs->x_private) != 1)

		return (FALSE);

	return (TRUE);

}

static bool_t

xdrstdio_getbytes(xdrs, addr, len)

	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(xdrs, addr, len)

	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(xdrs)

	XDR *xdrs;

{

	return ((u_int) ftell((FILE *)xdrs->x_private));

}

static bool_t

xdrstdio_setpos(xdrs, pos) 

	XDR *xdrs;

	u_int pos;

{ 

	return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?

		FALSE : TRUE);

}

/* ARGSUSED */

static int32_t *

xdrstdio_inline(xdrs, len)

	XDR *xdrs;

	u_int len;

{

	/*

	 * 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);

}