/* @(#)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 <rpc/types.h>
#include <stdio.h>
#include <rpc/xdr.h>

static bool_t xdrstdio_getlong (XDR *, long *);
static bool_t xdrstdio_putlong (XDR *, const long *);
static bool_t xdrstdio_getbytes (XDR *, caddr_t, u_int);
static bool_t xdrstdio_putbytes (XDR *, const char *, u_int);
static u_int xdrstdio_getpos (const XDR *);
static bool_t xdrstdio_setpos (XDR *, u_int);
static long *xdrstdio_inline (XDR *, 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 */
};

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

static bool_t
xdrstdio_getlong (xdrs, lp)
     XDR *xdrs;
     long *lp;
{
  int32_t mycopy;

  if (fread ((caddr_t) & mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)
    return FALSE;
  *lp = (int32_t) ntohl (mycopy);
  return TRUE;
}

static bool_t
xdrstdio_putlong (XDR *xdrs, const long *lp)
{

  long mycopy = htonl (*lp);
  lp = &mycopy;
  if (fwrite ((caddr_t) lp, 4, 1, (FILE *) xdrs->x_private) != 1)
    return FALSE;
  return TRUE;
}

static bool_t
xdrstdio_getbytes (xdrs, addr, len)
     XDR *xdrs;
     const 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, const char *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 (const 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;
}

static long *
xdrstdio_inline (XDR *xdrs, 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;
}