/*

 * xdr_stdio.c, XDR implementation on standard i/o file.

 *

 * 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.

 *

 * 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>

#include <libio/iolibio.h>

#include <shlib-compat.h>

#define fflush(s) _IO_fflush (s)

#define fread(p, m, n, s) _IO_fread (p, m, n, s)

#define ftell(s) _IO_ftell (s)

#define fwrite(p, m, n, s) _IO_fwrite (p, m, n, s)

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 int32_t *xdrstdio_inline (XDR *, u_int);

static void xdrstdio_destroy (XDR *);

static bool_t xdrstdio_getint32 (XDR *, int32_t *);

static bool_t xdrstdio_putint32 (XDR *, const int32_t *);

/*

 * 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 */

  xdrstdio_getint32,		/* deserialize a int */

  xdrstdio_putint32		/* serialize a int */

};

/*

 * 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;

  /* We have to add the const since the `struct xdr_ops' in `struct XDR'

     is not `const'.  */

  xdrs->x_ops = (struct xdr_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 *lp)

{

  uint32_t mycopy;

  if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)

    return FALSE;

  *lp = (long) ntohl (mycopy);

  return TRUE;

}

static bool_t

xdrstdio_putlong (XDR *xdrs, const long *lp)

{

  int32_t mycopy = htonl ((uint32_t) *lp);

  if (fwrite ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)

    return FALSE;

  return TRUE;

}

static bool_t

xdrstdio_getbytes (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 int32_t *

xdrstdio_inline (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;

}

static bool_t

xdrstdio_getint32 (XDR *xdrs, int32_t *ip)

{

  int32_t mycopy;

  if (fread ((caddr_t) &mycopy, 4, 1, (FILE *) xdrs->x_private) != 1)

    return FALSE;

  *ip = ntohl (mycopy);

  return TRUE;

}

static bool_t

xdrstdio_putint32 (XDR *xdrs, const int32_t *ip)

{

  int32_t mycopy = htonl (*ip);

  ip = &mycopy;

  if (fwrite ((caddr_t) ip, 4, 1, (FILE *) xdrs->x_private) != 1)

    return FALSE;

  return TRUE;

}

#ifdef EXPORT_RPC_SYMBOLS

libc_hidden_def (xdrstdio_create)

#else

libc_hidden_nolink_sunrpc (xdrstdio_create, GLIBC_2_0)

#endif