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/*

 * 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

 */

/*

 * xdr_mem.h, XDR implementation using memory buffers.

 *

 * Copyright (C) 1984, Sun Microsystems, Inc.

 *

 * If you have some data to be interpreted as external data representation

 * or to be converted to external data representation in a memory buffer,

 * then this is the package for you.

 *

 */

#define __FORCE_GLIBC

#define _GNU_SOURCE

#include <features.h>

#include <string.h>

#include <rpc/rpc.h>

static bool_t xdrmem_getlong (XDR *, long *);

static bool_t xdrmem_putlong (XDR *, const long *);

static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int);

static bool_t xdrmem_putbytes (XDR *, const char *, u_int);

static u_int xdrmem_getpos (const XDR *);

static bool_t xdrmem_setpos (XDR *, u_int);

static int32_t *xdrmem_inline (XDR *, int);

static void xdrmem_destroy (XDR *);

static bool_t xdrmem_getint32 (XDR *, int32_t *);

static bool_t xdrmem_putint32 (XDR *, const int32_t *);

static const struct xdr_ops xdrmem_ops =

{

  xdrmem_getlong,

  xdrmem_putlong,

  xdrmem_getbytes,

  xdrmem_putbytes,

  xdrmem_getpos,

  xdrmem_setpos,

  xdrmem_inline,

  xdrmem_destroy,

  xdrmem_getint32,

  xdrmem_putint32

};

/*

 * The procedure xdrmem_create initializes a stream descriptor for a

 * memory buffer.

 */

void

xdrmem_create (XDR *xdrs, const caddr_t addr, u_int size, 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 *) &xdrmem_ops;

  xdrs->x_private = xdrs->x_base = addr;

  xdrs->x_handy = size;

}

/*

 * Nothing needs to be done for the memory case.  The argument is clearly

 * const.

 */

static void

xdrmem_destroy (XDR *xdrs)

{

}

/*

 * Gets the next word from the memory referenced by xdrs and places it

 * in the long pointed to by lp.  It then increments the private word to

 * point at the next element.  Neither object pointed to is const

 */

static bool_t

xdrmem_getlong (XDR *xdrs, long *lp)

{

  if ((xdrs->x_handy -= 4) < 0)

    return FALSE;

  *lp = (int32_t) ntohl ((*((int32_t *) (xdrs->x_private))));

  xdrs->x_private += 4;

  return TRUE;

}

/*

 * Puts the long pointed to by lp in the memory referenced by xdrs.  It

 * then increments the private word to point at the next element.  The

 * long pointed at is const

 */

static bool_t

xdrmem_putlong (XDR *xdrs, const long *lp)

{

  if ((xdrs->x_handy -= 4) < 0)

    return FALSE;

  *(int32_t *) xdrs->x_private = htonl (*lp);

  xdrs->x_private += 4;

  return TRUE;

}

/*

 * Gets an unaligned number of bytes from the xdrs structure and writes them

 * to the address passed in addr.  Be very careful when calling this routine

 * as it could leave the xdrs pointing to an unaligned structure which is not

 * a good idea.  None of the things pointed to are const.

 */

static bool_t

xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len)

{

  if ((xdrs->x_handy -= len) < 0)

    return FALSE;

  memcpy (addr, xdrs->x_private, len);

  xdrs->x_private += len;

  return TRUE;

}

/*

 * The complementary function to the above.  The same warnings apply about

 * unaligned data.  The source address is const.

 */

static bool_t

xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len)

{

  if ((xdrs->x_handy -= len) < 0)

    return FALSE;

  memcpy (xdrs->x_private, addr, len);

  xdrs->x_private += len;

  return TRUE;

}

/*

 * Not sure what this one does.  But it clearly doesn't modify the contents

 * of xdrs.  **FIXME** does this not assume u_int == u_long?

 */

static u_int

xdrmem_getpos (const XDR *xdrs)

{

  return (u_long) xdrs->x_private - (u_long) xdrs->x_base;

}

/*

 * xdrs modified

 */

static bool_t

xdrmem_setpos (xdrs, pos)

     XDR *xdrs;

     u_int pos;

{

  caddr_t newaddr = xdrs->x_base + pos;

  caddr_t lastaddr = xdrs->x_private + xdrs->x_handy;

  if ((long) newaddr > (long) lastaddr)

    return FALSE;

  xdrs->x_private = newaddr;

  xdrs->x_handy = (long) lastaddr - (long) newaddr;

  return TRUE;

}

/*

 * xdrs modified

 */

static int32_t *

xdrmem_inline (XDR *xdrs, int len)

{

  int32_t *buf = 0;

  if (xdrs->x_handy >= len)

    {

      xdrs->x_handy -= len;

      buf = (int32_t *) xdrs->x_private;

      xdrs->x_private += len;

    }

  return buf;

}

/*

 * Gets the next word from the memory referenced by xdrs and places it

 * in the int pointed to by ip.  It then increments the private word to

 * point at the next element.  Neither object pointed to is const

 */

static bool_t

xdrmem_getint32 (XDR *xdrs, int32_t *ip)

{

  if ((xdrs->x_handy -= 4) < 0)

    return FALSE;

  *ip = ntohl ((*((int32_t *) (xdrs->x_private))));

  xdrs->x_private += 4;

  return TRUE;

}

/*

 * Puts the long pointed to by lp in the memory referenced by xdrs.  It

 * then increments the private word to point at the next element.  The

 * long pointed at is const

 */

static bool_t

xdrmem_putint32 (XDR *xdrs, const int32_t *ip)

{

  if ((xdrs->x_handy -= 4) < 0)

    return FALSE;

  *(int32_t *) xdrs->x_private = htonl (*ip);

  xdrs->x_private += 4;

  return TRUE;

}