awips2/ldm/src/rpc/xdr_stdio.c

/* @(#)xdr_stdio.c	2.1 88/07/29 4.0 RPCSRC */
/*
 * 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, MERCHANTIBILITY 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
 */
#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)xdr_stdio.c 1.16 87/08/11 Copyr 1984 Sun Micro";
#endif

/*
 * 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 "config.h"

#include <arpa/inet.h>	/* for htonl() & ntohl() */
#include <stdio.h>
#include "types.h"
#include "xdr.h"

static bool_t	xdrstdio_getlong(XDR *xdrs, uint32_t *lp);
static bool_t	xdrstdio_putlong(XDR *xdrs, uint32_t *lp);
static bool_t	xdrstdio_getbytes(XDR *xdrs, char* addr, unsigned len);
static bool_t	xdrstdio_putbytes(XDR *xdrs, char* addr, unsigned len);
static unsigned	xdrstdio_getpos(XDR *xdrs);
static bool_t	xdrstdio_setpos(XDR *xdrs, unsigned pos);
static uint32_t*xdrstdio_inline(XDR *xdrs, unsigned len);
static void	xdrstdio_destroy(XDR *xdrs);

/*
 * Ops vector for stdio type XDR
 */
static 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(
	register XDR *xdrs,
	FILE *file,
	enum xdr_op op)
{
	xdrs->x_op = op;
	xdrs->x_ops = &xdrstdio_ops;
	xdrs->x_private = (char*)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(
	register XDR *xdrs)
{
	(void)fflush((FILE *)xdrs->x_private);
	/* xx should we close the file ?? */
}

static bool_t
xdrstdio_getlong(
	XDR *xdrs,
	register uint32_t *lp)
{
	uint32_t	mycopy;

	if (fread(&mycopy, sizeof(mycopy), 1, (FILE *)xdrs->x_private) != 1)
		return (FALSE);
	*lp = ntohl(mycopy);
	return (TRUE);
}

static bool_t
xdrstdio_putlong(
	XDR *xdrs,
	uint32_t *lp)
{
	uint32_t mycopy = htonl(*lp);

	if (fwrite(&mycopy, sizeof(mycopy), 1, (FILE *)xdrs->x_private) != 1)
		return (FALSE);
	return (TRUE);
}

static bool_t
xdrstdio_getbytes(
	XDR *xdrs,
	char* addr,
	unsigned 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,
	char* addr,
	unsigned len)
{
	if ((len != 0) && (fwrite(addr, (int)len, 1, (FILE *)xdrs->x_private) != 1))
		return (FALSE);
	return (TRUE);
}

static unsigned
xdrstdio_getpos(
	XDR *xdrs)
{
	return ((unsigned) ftell((FILE *)xdrs->x_private));
}

static bool_t
xdrstdio_setpos(
	XDR *xdrs,
	unsigned pos)
{ 
	return ((fseek((FILE *)xdrs->x_private, (long)pos, 0) < 0) ?
		FALSE : TRUE);
}

/*ARGSUSED*/
static uint32_t *
xdrstdio_inline(
	XDR *xdrs,
	unsigned 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);
}