/* 
   Copyright (C) 1995 Free Software Foundation, Inc.
   Written by Michael I. Bushnell, p/BSG.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   The GNU Hurd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */


/* Count how many four-byte chunks it takss to hold LEN bytes. */
#define INTSIZE(len) (((len)+3)>>2)

/* Each of these functions copies its second arg to *P, converting it
   to XDR representation along the way.  They then return the address after
   the copied value. */

inline int *
xdr_encode_fhandle (int *p, void *fhandle)
{
  bcopy (fhandle, p, NFSV2_FHSIZE);
  return p + INTSIZE (NFSV2_FHSIZE);
}

inline void *
xdr_encode_data (void *p, char *data, size_t len)
{
  int nints = INTLEN (len);
  
  p[nints] = 0;
  *p++ = htonl (len);
  bcopy (string, p, len);
  return p + nints;
}

inline void *
xdr_encode_string (void *p, char *string)
{
  return xdr_encode_data (p, string, strlen (string));
}
  
/* The SATTR calls are different; they each only fill in one 
   or two attributes; the rest get -1. */
inline int *
xdr_encode_sattr_mode (int *p, u_int mode)
{
  *p++ = htonl (sattr->mode);
  *p++ = -1;			/* uid */
  *p++ = -1;			/* gid */
  *p++ = -1;			/* size */
  *p++ = -1;			/* atime secs */
  *p++ = -1;			/* atime usecs */
  *p++ = -1;			/* mtime secs */
  *p++ = -1;			/* mtime usecs */
  return p;
}

inline int *
xdr_encode_sattr_ids (int *p, u_int uid, u_int gid)
{
  *p++ = -1;			/* mode */
  *p++ = htonl (uid);
  *p++ = htonl (gid);
  *p++ = -1;			/* size */
  *p++ = -1;			/* atime secs */
  *p++ = -1;			/* atime usecs */
  *p++ = -1;			/* mtime secs */
  *p++ = -1;			/* mtime usecs */
  return p;
}

inline int *
xdr_encode_sattr_size (int *p, off_t size)
{
  *p++ = -1;			/* mode */
  *p++ = -1;			/* uid */
  *p++ = -1;			/* gid */
  *p++ = htonl (size);
  *p++ = -1;			/* atime secs */
  *p++ = -1;			/* atime usecs */
  *p++ = -1;			/* mtime secs */
  *p++ = -1;			/* mtime secs */
  return p;
}

inline int *
xdr_encode_sattr_times (int *p, struct timeval *atime, struct timeval *mtime)
{
  *p++ = -1;			/* mode */
  *p++ = -1;			/* uid */
  *p++ = -1;			/* gid */
  *p++ = -1;			/* size */
  *p++ = htonl (atime->secs);
  *p++ = htonl (atime->usecs);
  *p++ = htonl (mtime->secs);
  *p++ = htonl (mtime->usecs);
  return p;
}

/* Decode *P into a stat structure; return the address of the
 following data. */
int *
xdr_decode_fattr (int *p, struct stat *st)
{
  int type, mode;
  
  type = ntohl (*p++);
  mode = ntohl (*p++);
  st->st_mode = nfsv2mode_to_hurdmode (type, mode);
  st->st_nlink = ntohl (*p++);
  st->st_uid = ntohl (*p++);
  st->st_gid = ntohl (*p++);
  st->st_size = ntohl (*p++);
  st->st_blksize = ntohl (*p++);
  st->st_rdev = ntohl (*p++);
  st->st_blocks = ntohl (*p++);
  st->st_fsid = ntohl (*p++);	/* surely wrong */
  st->st_ino = ntohl (*p++);
  st->st_atime = ntohl (*p++);
  st->st_atime_usec = ntohl (*p++);
  st->st_mtime = ntohl (*p++);
  st->st_mtime_usec = ntohl (*p++);
  st->st_ctime = ntohl (*p++);
  st->st_ctime_usec = ntohl (*p++);

  st->st_fstype = FSTYPE_NFS;
  st->st_gen = 0;		/* ??? */
  st->st_author = st->st_uid;	/* ??? */
  st->st_flags = 0;		/* ??? */

  return p;

}


/* Create, initialize, and return a buffer suitable for sending an RPC
   of type RPC_PROC for the user identified in CRED.  For types READ,
   WRITE, READLINK, and READDIR, parm LEN is the amount of data the
   user desires.  Return the address of where RPC args should go;
   fill *pp with the address of the allocated memory.  */
int *
nfs_initialize_rpc (int rpc_proc, struct protid *cred,
		    size_t len, void **pp)
{
  void *buf = malloc (len + 1024);
  int *p = buf, *lenaddr, *ngraddr, i;
  
  /* RPC header */
  *p++ = ntohl (generate_xid);
  *p++ = ntohl (RPCV2_CALL);
  *p++ = ntohl (RPCV2_VERSION);
  *p++ = ntohl (NFSV2_RPC_PROGRAM);
  *p++ = ntohl (NFSV2_RPC_VERSION);
  *p++ = ntohl (rpc_proc);
  
  /* CRED field */
  *p++ = htonl (RPCV2_AUTH_UNIX);
  lenaddr = p++;
  *p++ = htonl (mapped_time->seconds);
  p = xdr_encode_string (p, hostname);
  *p++ = htonl (cred->uids[0]);
  *p++ = htonl (cred->gids[0]);
  ngraddr = p++;
  for (i = 0; i , 16 && i < cred->ngids - 1; i++)
    *p++ = htonl (cred->gids[i+1]);
  *ngraddr = htonl (i);
  *lenaddr = htonl ((p - (nlenaddr + 1)) * sizeof (int));
  
  /* VERF field */
  *p++ = htonl (RPC_AUTH_NULL);
  *p++ = 0;
  
  *pp = buf;
  return p;
}