text: /*	$NetBSD: ntfs_subr.c,v 1.23 1999/10/31 19:45:26 jdolecek Exp $	*/
  
  /*-
   * Copyright (c) 1998, 1999 Semen Ustimenko (semenu@FreeBSD.org)
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. 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.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
   *
   * $FreeBSD: src/sys/ntfs/ntfs_subr.c,v 1.7.2.4 2001/10/12 22:08:49 semenu Exp $
   */
  
  #include <sys/param.h>
  #include <sys/types.h>
  #include <sys/systm.h>
  #include <sys/proc.h>
  #include <sys/namei.h>
  #include <sys/kernel.h>
  #include <sys/vnode.h>
  #include <sys/mount.h>
  #include <sys/buf.h>
  #include <sys/file.h>
  #include <sys/malloc.h>
  #include <sys/lock.h>
  #include <sys/spinlock.h>
  #include <sys/iconv.h>
  
  #include <machine/inttypes.h>
  
  #include <sys/buf2.h>
  #include <sys/spinlock2.h>
  
  #if defined(__NetBSD__)
  #include <miscfs/specfs/specdev.h>
  #endif
  
  /* #define NTFS_DEBUG 1 */
  #include "ntfs.h"
  #include "ntfsmount.h"
  #include "ntfs_inode.h"
  #include "ntfs_vfsops.h"
  #include "ntfs_subr.h"
  #include "ntfs_compr.h"
  #include "ntfs_ihash.h"
  
  #if defined(__DragonFly__)
  MALLOC_DEFINE(M_NTFSNTVATTR, "NTFS vattr", "NTFS file attribute information");
  MALLOC_DEFINE(M_NTFSRDATA, "NTFS res data", "NTFS resident data");
  MALLOC_DEFINE(M_NTFSRUN, "NTFS vrun", "NTFS vrun storage");
  MALLOC_DEFINE(M_NTFSDECOMP, "NTFS decomp", "NTFS decompression temporary");
  #endif
  
  static int ntfs_ntlookupattr (struct ntfsmount *, const char *, int, int *, char **);
  static int ntfs_findvattr (struct ntfsmount *, struct ntnode *, struct ntvattr **, struct ntvattr **, u_int32_t, const char *, size_t, cn_t);
  static int ntfs_uastricmp (struct ntfsmount *, const wchar *, size_t, const char *, size_t);
  static int ntfs_uastrcmp (struct ntfsmount *, const wchar *, size_t, const char *, size_t);
  
  /* table for mapping Unicode chars into uppercase; it's filled upon first
   * ntfs mount, freed upon last ntfs umount */
  static wchar *ntfs_toupper_tab;
  #define NTFS_TOUPPER(ch)	(ntfs_toupper_tab[(ch)])
  static struct lock ntfs_toupper_lock;
  static signed int ntfs_toupper_usecount;
  extern struct iconv_functions *ntfs_iconv;
  
  /* support macro for ntfs_ntvattrget() */
  #define NTFS_AALPCMP(aalp,type,name,namelen) (				\
    (aalp->al_type == type) && (aalp->al_namelen == namelen) &&		\
    !NTFS_UASTRCMP(aalp->al_name,aalp->al_namelen,name,namelen) )
  
  /*
   * 
   */
  int
  ntfs_ntvattrrele(struct ntvattr *vap)
  {
  	dprintf(("ntfs_ntvattrrele: ino: %"PRId64", type: 0x%x\n",
  		 vap->va_ip->i_number, vap->va_type));
  
  	ntfs_ntrele(vap->va_ip);
  
  	return (0);
  }
  
  /*
   * find the attribute in the ntnode
   */
  static int
  ntfs_findvattr(struct ntfsmount *ntmp, struct ntnode *ip,
  	       struct ntvattr **lvapp, struct ntvattr **vapp, u_int32_t type,
  	       const char *name, size_t namelen, cn_t vcn)
  {
  	int error;
  	struct ntvattr *vap;
  
  	if((ip->i_flag & IN_LOADED) == 0) {
  		dprintf(("ntfs_findvattr: node not loaded, ino: %"PRId64"\n",
  		       ip->i_number));
  		error = ntfs_loadntnode(ntmp,ip);
  		if (error) {
  			kprintf("ntfs_findvattr: FAILED TO LOAD INO: %"PRId64"\n",
  			       ip->i_number);
  			return (error);
  		}
  	}
  
  	*lvapp = NULL;
  	*vapp = NULL;
  	for (vap = ip->i_valist.lh_first; vap; vap = vap->va_list.le_next) {
  		ddprintf(("ntfs_findvattr: type: 0x%x, vcn: %d - %d\n", \
  			  vap->va_type, (u_int32_t) vap->va_vcnstart, \
  			  (u_int32_t) vap->va_vcnend));
  		if ((vap->va_type == type) &&
  		    (vap->va_vcnstart <= vcn) && (vap->va_vcnend >= vcn) &&
  		    (vap->va_namelen == namelen) &&
  		    (strncmp(name, vap->va_name, namelen) == 0)) {
  			*vapp = vap;
  			ntfs_ntref(vap->va_ip);
  			return (0);
  		}
  		if (vap->va_type == NTFS_A_ATTRLIST)
  			*lvapp = vap;
  	}
  
  	return (-1);
  }
  
  /*
   * Search attribute specifed in ntnode (load ntnode if nessecary).
   * If not found but ATTR_A_ATTRLIST present, read it in and search throught.
   * VOP_VGET node needed, and lookup througth it's ntnode (load if nessesary).
   *
   * ntnode should be locked
   */
  int
  ntfs_ntvattrget(struct ntfsmount *ntmp, struct ntnode *ip, u_int32_t type,
  		const char *name, cn_t vcn, struct ntvattr **vapp)
  {
  	struct ntvattr *lvap = NULL;
  	struct attr_attrlist *aalp;
  	struct attr_attrlist *nextaalp;
  	struct vnode   *newvp;
  	struct ntnode  *newip;
  	caddr_t         alpool;
  	size_t		namelen, len;
  	int             error;
  
  	*vapp = NULL;
  
  	if (name) {
  		dprintf(("ntfs_ntvattrget: " \
  			 "ino: %"PRId64", type: 0x%x, name: %s, vcn: %d\n", \
  			 ip->i_number, type, name, (u_int32_t) vcn));
  		namelen = strlen(name);
  	} else {
  		dprintf(("ntfs_ntvattrget: " \
  			 "ino: %"PRId64", type: 0x%x, vcn: %d\n", \
  			 ip->i_number, type, (u_int32_t) vcn));
  		name = "";
  		namelen = 0;
  	}
  
  	error = ntfs_findvattr(ntmp, ip, &lvap, vapp, type, name, namelen, vcn);
  	if (error >= 0)
  		return (error);
  
  	if (!lvap) {
  		dprintf(("ntfs_ntvattrget: UNEXISTED ATTRIBUTE: " \
  		       "ino: %"PRId64", type: 0x%x, name: %s, vcn: %d\n", \
  		       ip->i_number, type, name, (u_int32_t) vcn));
  		return (ENOENT);
  	}
  	/* Scan $ATTRIBUTE_LIST for requested attribute */
  	len = lvap->va_datalen;
  	alpool = kmalloc(len, M_TEMP, M_WAITOK);
  	error = ntfs_readntvattr_plain(ntmp, ip, lvap, 0, len, alpool, &len,
  			NULL);
  	if (error)
  		goto out;
  
  	aalp = (struct attr_attrlist *) alpool;
  	nextaalp = NULL;
  
  	for(; len > 0; aalp = nextaalp) {
  		dprintf(("ntfs_ntvattrget: " \
  			 "attrlist: ino: %d, attr: 0x%x, vcn: %d\n", \
  			 aalp->al_inumber, aalp->al_type, \
  			 (u_int32_t) aalp->al_vcnstart));
  
  		if (len > aalp->reclen) {
  			nextaalp = NTFS_NEXTREC(aalp, struct attr_attrlist *);
  		} else {
  			nextaalp = NULL;
  		}
  		len -= aalp->reclen;
  
  		if (!NTFS_AALPCMP(aalp, type, name, namelen) ||
  		    (nextaalp && (nextaalp->al_vcnstart <= vcn) &&
  		     NTFS_AALPCMP(nextaalp, type, name, namelen)))
  			continue;
  
  		dprintf(("ntfs_ntvattrget: attribute in ino: %d\n",
  				 aalp->al_inumber));
  
  		/* this is not a main record, so we can't use just plain
  		   vget() */
  		error = ntfs_vgetex(ntmp->ntm_mountp, aalp->al_inumber,
  				NTFS_A_DATA, NULL, LK_EXCLUSIVE,
  				VG_EXT, curthread, &newvp);
  		if (error) {
  			kprintf("ntfs_ntvattrget: CAN'T VGET INO: %d\n",
  			       aalp->al_inumber);
  			goto out;
  		}
  		newip = VTONT(newvp);
  		/* XXX have to lock ntnode */
  		error = ntfs_findvattr(ntmp, newip, &lvap, vapp,
  				type, name, namelen, vcn);
  		vput(newvp);
  		if (error == 0)
  			goto out;
  		kprintf("ntfs_ntvattrget: ATTRLIST ERROR.\n");
  		break;
  	}
  	error = ENOENT;
  
  	dprintf(("ntfs_ntvattrget: UNEXISTED ATTRIBUTE: " \
  	       "ino: %"PRId64", type: 0x%x, name: %.*s, vcn: %d\n", \
  	       ip->i_number, type, (int) namelen, name, (u_int32_t) vcn));
  out:
  	kfree(alpool, M_TEMP);
  	return (error);
  }
  
  /*
   * Read ntnode from disk, make ntvattr list.
   *
   * ntnode should be locked
   */
  int
  ntfs_loadntnode(struct ntfsmount *ntmp, struct ntnode *ip)
  {
  	struct filerec  *mfrp;
  	daddr_t         bn;
  	int		error,off;
  	struct attr    *ap;
  	struct ntvattr *nvap;
  
  	dprintf(("ntfs_loadntnode: loading ino: %"PRId64"\n",ip->i_number));
  
  	mfrp = kmalloc(ntfs_bntob(ntmp->ntm_bpmftrec), M_TEMP, M_WAITOK);
  
  	if (ip->i_number < NTFS_SYSNODESNUM) {
  		struct buf     *bp;
  
  		dprintf(("ntfs_loadntnode: read system node\n"));
  
  		bn = ntfs_cntobn(ntmp->ntm_mftcn) +
  			ntmp->ntm_bpmftrec * ip->i_number;
  
  		error = bread(ntmp->ntm_devvp,
  			      ntfs_bntodoff(bn), ntfs_bntob(ntmp->ntm_bpmftrec), &bp);
  		if (error) {
  			kprintf("ntfs_loadntnode: BREAD FAILED\n");
  			brelse(bp);
  			goto out;
  		}
  		memcpy(mfrp, bp->b_data, ntfs_bntob(ntmp->ntm_bpmftrec));
  		bqrelse(bp);
  	} else {
  		struct vnode   *vp;
  
  		vp = ntmp->ntm_sysvn[NTFS_MFTINO];
  		error = ntfs_readattr(ntmp, VTONT(vp), NTFS_A_DATA, NULL,
  			       ip->i_number * ntfs_bntob(ntmp->ntm_bpmftrec),
  			       ntfs_bntob(ntmp->ntm_bpmftrec), mfrp, NULL);
  		if (error) {
  			kprintf("ntfs_loadntnode: ntfs_readattr failed\n");
  			goto out;
  		}
  	}
  
  	/* Check if magic and fixups are correct */
  	error = ntfs_procfixups(ntmp, NTFS_FILEMAGIC, (caddr_t)mfrp,
  				ntfs_bntob(ntmp->ntm_bpmftrec));
  	if (error) {
  		kprintf("ntfs_loadntnode: BAD MFT RECORD %"PRId64"\n",
  		       ip->i_number);
  		goto out;
  	}
  
  	dprintf(("ntfs_loadntnode: load attrs for ino: %"PRId64"\n",ip->i_number));
  	off = mfrp->fr_attroff;
  	ap = (struct attr *) ((caddr_t)mfrp + off);
  
  	LIST_INIT(&ip->i_valist);
  	
  	while (ap->a_hdr.a_type != -1) {
  		error = ntfs_attrtontvattr(ntmp, &nvap, ap);
  		if (error)
  			break;
  		nvap->va_ip = ip;
  
  		LIST_INSERT_HEAD(&ip->i_valist, nvap, va_list);
  
  		off += ap->a_hdr.reclen;
  		ap = (struct attr *) ((caddr_t)mfrp + off);
  	}
  	if (error) {
  		kprintf("ntfs_loadntnode: failed to load attr ino: %"PRId64"\n",
  		       ip->i_number);
  		goto out;
  	}
  
  	ip->i_mainrec = mfrp->fr_mainrec;
  	ip->i_nlink = mfrp->fr_nlink;
  	ip->i_frflag = mfrp->fr_flags;
  
  	ip->i_flag |= IN_LOADED;
  
  out:
  	kfree(mfrp, M_TEMP);
  	return (error);
  }
  		
  /*
   * Routine locks ntnode and increase usecount, just opposite of
   * ntfs_ntput().
   */
  int
  ntfs_ntget(struct ntnode *ip)
  {
  	dprintf(("ntfs_ntget: get ntnode %"PRId64": %p, usecount: %d\n",
  		ip->i_number, ip, ip->i_usecount));
  
  	ip->i_usecount++;	/* ZZZ */
  	LOCKMGR(&ip->i_lock, LK_EXCLUSIVE);
  
  	return 0;
  }
  
  /*
   * Routine search ntnode in hash, if found: lock, inc usecount and return.
   * If not in hash allocate structure for ntnode, prefill it, lock,
   * inc count and return.
   *
   * ntnode returned locked
   */
  int
  ntfs_ntlookup(struct ntfsmount *ntmp, ino_t ino, struct ntnode **ipp)
  {
  	struct ntnode  *ip;
  
  	dprintf(("ntfs_ntlookup: looking for ntnode %d\n", ino));
  
  	do {
  		if ((ip = ntfs_nthashlookup(ntmp->ntm_dev, ino)) != NULL) {
  			ntfs_ntget(ip);
  			dprintf(("ntfs_ntlookup: ntnode %d: %p, usecount: %d\n",
  				ino, ip, ip->i_usecount));
  			*ipp = ip;
  			return (0);
  		}
  	} while (LOCKMGR(&ntfs_hashlock, LK_EXCLUSIVE | LK_SLEEPFAIL));
  
  	ip = kmalloc(sizeof(struct ntnode), M_NTFSNTNODE, M_WAITOK | M_ZERO);
  	ddprintf(("ntfs_ntlookup: allocating ntnode: %d: %p\n", ino, ip));
  
  	/* Generic initialization */
  	ip->i_devvp = ntmp->ntm_devvp;
  	ip->i_dev = ntmp->ntm_dev;
  	ip->i_number = ino;
  	ip->i_mp = ntmp;
  
  	LIST_INIT(&ip->i_fnlist);
  	vref(ip->i_devvp);
  
  	/* init lock and lock the newborn ntnode */
  	lockinit(&ip->i_lock, "ntnode", 0, LK_EXCLUSIVE);
  	spin_init(&ip->i_interlock);
  	ntfs_ntget(ip);
  
  	ntfs_nthashins(ip);
  
  	LOCKMGR(&ntfs_hashlock, LK_RELEASE);
  
  	*ipp = ip;
  
  	dprintf(("ntfs_ntlookup: ntnode %d: %p, usecount: %d\n",
  		ino, ip, ip->i_usecount));
  
  	return (0);
  }
  
  /*
   * Decrement usecount of ntnode and unlock it, if usecount reach zero,
   * deallocate ntnode.
   *
   * ntnode should be locked on entry, and unlocked on return.
   */
  void
  ntfs_ntput(struct ntnode *ip)
  {
  	struct ntvattr *vap;
  
  	dprintf(("ntfs_ntput: rele ntnode %"PRId64": %p, usecount: %d\n",
  		ip->i_number, ip, ip->i_usecount));
  
  	spin_lock(&ip->i_interlock);
  	ip->i_usecount--;
  
  #ifdef DIAGNOSTIC
  	if (ip->i_usecount < 0) {
  		spin_unlock(&ip->i_interlock);
  		panic("ntfs_ntput: ino: %"PRId64" usecount: %d \n",
  		      ip->i_number,ip->i_usecount);
  	}
  #endif
  
  	if (ip->i_usecount > 0) {
  		spin_unlock(&ip->i_interlock);
  		LOCKMGR(&ip->i_lock, LK_RELEASE);
  		return;
  	}
  
  	dprintf(("ntfs_ntput: deallocating ntnode: %"PRId64"\n", ip->i_number));
  
  	if (ip->i_fnlist.lh_first) {
  		spin_unlock(&ip->i_interlock);
  		panic("ntfs_ntput: ntnode has fnodes\n");
  	}
  
  	/*
  	 * XXX this is a bit iffy because we are making high level calls
  	 * while holding a spinlock.
  	 */
  	ntfs_nthashrem(ip);
  
  	while ((vap = LIST_FIRST(&ip->i_valist)) != NULL) {
  		LIST_REMOVE(vap,va_list);
  		ntfs_freentvattr(vap);
  	}
  	spin_unlock(&ip->i_interlock);
  	vrele(ip->i_devvp);
  	kfree(ip, M_NTFSNTNODE);
  }
  
  /*
   * increment usecount of ntnode 
   */
  void
  ntfs_ntref(struct ntnode *ip)
  {
  	ip->i_usecount++;
  
  	dprintf(("ntfs_ntref: ino %"PRId64", usecount: %d\n",
  		ip->i_number, ip->i_usecount));
  			
  }
  
  /*
   * Decrement usecount of ntnode.
   */
  void
  ntfs_ntrele(struct ntnode *ip)
  {
  	dprintf(("ntfs_ntrele: rele ntnode %"PRId64": %p, usecount: %d\n",
  		ip->i_number, ip, ip->i_usecount));
  
  	spin_lock(&ip->i_interlock);
  	ip->i_usecount--;
  
  	if (ip->i_usecount < 0) {
  		spin_unlock(&ip->i_interlock);
  		panic("ntfs_ntrele: ino: %"PRId64" usecount: %d \n",
  		      ip->i_number,ip->i_usecount);
  	}
  	spin_unlock(&ip->i_interlock);
  }
  
  /*
   * Deallocate all memory allocated for ntvattr
   */
  void
  ntfs_freentvattr(struct ntvattr *vap)
  {
  	if (vap->va_flag & NTFS_AF_INRUN) {
  		if (vap->va_vruncn)
  			kfree(vap->va_vruncn, M_NTFSRUN);
  		if (vap->va_vruncl)
  			kfree(vap->va_vruncl, M_NTFSRUN);
  	} else {
  		if (vap->va_datap)
  			kfree(vap->va_datap, M_NTFSRDATA);
  	}
  	kfree(vap, M_NTFSNTVATTR);
  }
  
  /*
   * Convert disk image of attribute into ntvattr structure,
   * runs are expanded also.
   */
  int
  ntfs_attrtontvattr(struct ntfsmount *ntmp, struct ntvattr **rvapp,
  		   struct attr *rap)
  {
  	int             error, i;
  	struct ntvattr *vap;
  
  	error = 0;
  	*rvapp = NULL;
  
  	vap = kmalloc(sizeof(struct ntvattr), M_NTFSNTVATTR,
  		      M_WAITOK | M_ZERO);
  	vap->va_ip = NULL;
  	vap->va_flag = rap->a_hdr.a_flag;
  	vap->va_type = rap->a_hdr.a_type;
  	vap->va_compression = rap->a_hdr.a_compression;
  	vap->va_index = rap->a_hdr.a_index;
  
  	ddprintf(("type: 0x%x, index: %d", vap->va_type, vap->va_index));
  
  	vap->va_namelen = rap->a_hdr.a_namelen;
  	if (rap->a_hdr.a_namelen) {
  		wchar *unp = (wchar *) ((caddr_t) rap + rap->a_hdr.a_nameoff);
  		ddprintf((", name:["));
  		for (i = 0; i < vap->va_namelen; i++) {
  			vap->va_name[i] = unp[i];
  			ddprintf(("%c", vap->va_name[i]));
  		}
  		ddprintf(("]"));
  	}
  	if (vap->va_flag & NTFS_AF_INRUN) {
  		ddprintf((", nonres."));
  		vap->va_datalen = rap->a_nr.a_datalen;
  		vap->va_allocated = rap->a_nr.a_allocated;
  		vap->va_vcnstart = rap->a_nr.a_vcnstart;
  		vap->va_vcnend = rap->a_nr.a_vcnend;
  		vap->va_compressalg = rap->a_nr.a_compressalg;
  		error = ntfs_runtovrun(&(vap->va_vruncn), &(vap->va_vruncl),
  				       &(vap->va_vruncnt),
  				       (caddr_t) rap + rap->a_nr.a_dataoff);
  	} else {
  		vap->va_compressalg = 0;
  		ddprintf((", res."));
  		vap->va_datalen = rap->a_r.a_datalen;
  		vap->va_allocated = rap->a_r.a_datalen;
  		vap->va_vcnstart = 0;
  		vap->va_vcnend = ntfs_btocn(vap->va_allocated);
  		vap->va_datap = kmalloc(vap->va_datalen, M_NTFSRDATA,
  					M_WAITOK);
  		memcpy(vap->va_datap, (caddr_t) rap + rap->a_r.a_dataoff,
  		       rap->a_r.a_datalen);
  	}
  	ddprintf((", len: %d", vap->va_datalen));
  
  	if (error)
  		kfree(vap, M_NTFSNTVATTR);
  	else
  		*rvapp = vap;
  
  	ddprintf(("\n"));
  
  	return (error);
  }
  
  /*
   * Expand run into more utilizable and more memory eating format.
   */
  int
  ntfs_runtovrun(cn_t **rcnp, cn_t **rclp, u_long *rcntp, u_int8_t *run)
  {
  	u_int32_t       off;
  	u_int32_t       sz, i;
  	cn_t           *cn;
  	cn_t           *cl;
  	u_long		cnt;
  	cn_t		prev;
  	cn_t		tmp;
  
  	off = 0;
  	cnt = 0;
  	i = 0;
  	while (run[off]) {
  		off += (run[off] & 0xF) + ((run[off] >> 4) & 0xF) + 1;
  		cnt++;
  	}
  	cn = kmalloc(cnt * sizeof(cn_t), M_NTFSRUN, M_WAITOK);
  	cl = kmalloc(cnt * sizeof(cn_t), M_NTFSRUN, M_WAITOK);
  
  	off = 0;
  	cnt = 0;
  	prev = 0;
  	while (run[off]) {
  
  		sz = run[off++];
  		cl[cnt] = 0;
  
  		for (i = 0; i < (sz & 0xF); i++)
  			cl[cnt] += (u_int32_t) run[off++] << (i << 3);
  
  		sz >>= 4;
  		if (run[off + sz - 1] & 0x80) {
  			tmp = ((u_int64_t) - 1) << (sz << 3);
  			for (i = 0; i < sz; i++)
  				tmp |= (u_int64_t) run[off++] << (i << 3);
  		} else {
  			tmp = 0;
  			for (i = 0; i < sz; i++)
  				tmp |= (u_int64_t) run[off++] << (i << 3);
  		}
  		if (tmp)
  			prev = cn[cnt] = prev + tmp;
  		else
  			cn[cnt] = tmp;
  
  		cnt++;
  	}
  	*rcnp = cn;
  	*rclp = cl;
  	*rcntp = cnt;
  	return (0);
  }
  
  /*
   * Compare unicode and ascii string case insens.
   */
  static int
  ntfs_uastricmp(struct ntfsmount *ntmp, const wchar *ustr, size_t ustrlen,
  	       const char *astr, size_t astrlen)
  {
  	int len;
  	size_t i, j, mbstrlen = astrlen;
  	int res;
  	wchar wc;
  
  	if (ntmp->ntm_ic_l2u) {
  		for (i = 0, j = 0; i < ustrlen && j < astrlen; i++, j++) {
  			if (j < astrlen -1) {
  				wc = (wchar)astr[j]<<8 | (astr[j+1]&0xFF);
  				len = 2;
  			} else {
  				wc = (wchar)astr[j]<<8 & 0xFF00;
  				len = 1;
  			}
  			res = ((int) NTFS_TOUPPER(ustr[i])) -
  				((int)NTFS_TOUPPER(NTFS_82U(wc, &len)));
  			j += len - 1;
  			mbstrlen -= len - 1;
  
  			if (res)
  				return res;
  		}
  	} else {
  		/*
  		 * We use NTFS_82U(NTFS_U28(c)) to get rid of unicode
  		 * symbols not covered by translation table
  		 */
  		for (i = 0; i < ustrlen && i < astrlen; i++) {
  			res = ((int) NTFS_TOUPPER(NTFS_82U(NTFS_U28(ustr[i]), &len))) -
  				((int)NTFS_TOUPPER(NTFS_82U((wchar)astr[i], &len)));
  			if (res)
  				return res;
  		}
  	}
  	return (ustrlen - mbstrlen);
  }
  
  /*
   * Compare unicode and ascii string case sens.
   */
  static int
  ntfs_uastrcmp(struct ntfsmount *ntmp, const wchar *ustr, size_t ustrlen,
  	      const char *astr, size_t astrlen)
  {
  	char u, l;
  	size_t i, j, mbstrlen = astrlen;
  	int res;
  	wchar wc;
  
  	for (i = 0, j = 0; (i < ustrlen) && (j < astrlen); i++, j++) {
  		res = 0;
  		wc = NTFS_U28(ustr[i]);
  		u = (char)(wc>>8);
  		l = (char)wc;
  		if (u != '\0' && j < astrlen -1) {
  			res = (int) (u - astr[j++]);
  			mbstrlen--;
  		}
  		res = (res<<8) + (int) (l - astr[j]);
  		if (res)
  			return res;
  	}
  	return (ustrlen - mbstrlen);
  }
  
  /* 
   * Search fnode in ntnode, if not found allocate and preinitialize.
   *
   * ntnode should be locked on entry.
   */
  int
  ntfs_fget(struct ntfsmount *ntmp, struct ntnode *ip, int attrtype,
  	  char *attrname, struct fnode **fpp)
  {
  	struct fnode *fp;
  
  	dprintf(("ntfs_fget: ino: %"PRId64", attrtype: 0x%x, attrname: %s\n",
  		ip->i_number,attrtype, attrname?attrname:""));
  	*fpp = NULL;
  	for (fp = ip->i_fnlist.lh_first; fp != NULL; fp = fp->f_fnlist.le_next){
  		dprintf(("ntfs_fget: fnode: attrtype: %d, attrname: %s\n",
  			fp->f_attrtype, fp->f_attrname?fp->f_attrname:""));
  
  		if ((attrtype == fp->f_attrtype) && 
  		    ((!attrname && !fp->f_attrname) ||
  		     (attrname && fp->f_attrname &&
  		      !strcmp(attrname,fp->f_attrname)))){
  			dprintf(("ntfs_fget: found existed: %p\n",fp));
  			*fpp = fp;
  		}
  	}
  
  	if (*fpp)
  		return (0);
  
  	fp = kmalloc(sizeof(struct fnode), M_NTFSFNODE, M_WAITOK | M_ZERO);
  	dprintf(("ntfs_fget: allocating fnode: %p\n",fp));
  
  	fp->f_ip = ip;
  	if (attrname) {
  		fp->f_flag |= FN_AATTRNAME;
  		fp->f_attrname = kmalloc(strlen(attrname) + 1, M_TEMP,
  					 M_WAITOK);
  		strcpy(fp->f_attrname, attrname);
  	} else
  		fp->f_attrname = NULL;
  	fp->f_attrtype = attrtype;
  
  	ntfs_ntref(ip);
  
  	LIST_INSERT_HEAD(&ip->i_fnlist, fp, f_fnlist);
  
  	*fpp = fp;
  
  	return (0);
  }
  
  /*
   * Deallocate fnode, remove it from ntnode's fnode list.
   *
   * ntnode should be locked.
   */
  void
  ntfs_frele(struct fnode *fp)
  {
  	struct ntnode *ip = FTONT(fp);
  
  	dprintf(("ntfs_frele: fnode: %p for %"PRId64": %p\n", fp, ip->i_number, ip));
  
  	dprintf(("ntfs_frele: deallocating fnode\n"));
  	LIST_REMOVE(fp,f_fnlist);
  	if (fp->f_flag & FN_AATTRNAME)
  		kfree(fp->f_attrname, M_TEMP);
  	if (fp->f_dirblbuf)
  		kfree(fp->f_dirblbuf, M_NTFSDIR);
  	kfree(fp, M_NTFSFNODE);
  	ntfs_ntrele(ip);
  }
  
  /*
   * Lookup attribute name in format: [[:$ATTR_TYPE]:$ATTR_NAME], 
   * $ATTR_TYPE is searched in attrdefs read from $AttrDefs.
   * If $ATTR_TYPE nott specifed, ATTR_A_DATA assumed.
   */
  static int
  ntfs_ntlookupattr(struct ntfsmount *ntmp, const char *name, int namelen,
  		  int *attrtype, char **attrname)
  {
  	const char *sys;
  	size_t syslen, i;
  	struct ntvattrdef *adp;
  
  	if (namelen == 0)
  		return (0);
  
  	if (name[0] == '$') {
  		sys = name;
  		for (syslen = 0; syslen < namelen; syslen++) {
  			if(sys[syslen] == ':') {
  				name++;
  				namelen--;
  				break;
  			}
  		}
  		name += syslen;
  		namelen -= syslen;
  
  		adp = ntmp->ntm_ad;
  		for (i = 0; i < ntmp->ntm_adnum; i++, adp++){
  			if (syslen != adp->ad_namelen || 
  			   strncmp(sys, adp->ad_name, syslen) != 0)
  				continue;
  
  			*attrtype = adp->ad_type;
  			goto out;
  		}
  		return (ENOENT);
  	} else
  		*attrtype = NTFS_A_DATA;
  
      out:
  	if (namelen) {
  		(*attrname) = kmalloc(namelen, M_TEMP, M_WAITOK);
  		memcpy((*attrname), name, namelen);
  		(*attrname)[namelen] = '\0';
  	}
  
  	return (0);
  }
  
  /*
   * Lookup specifed node for filename, matching cnp,
   * return fnode filled.
   */
  int
  ntfs_ntlookupfile(struct ntfsmount *ntmp, struct vnode *vp,
  		  struct componentname *cnp, struct vnode **vpp)
  {
  	struct fnode   *fp = VTOF(vp);
  	struct ntnode  *ip = FTONT(fp);
  	struct ntvattr *vap;	/* Root attribute */
  	cn_t            cn;	/* VCN in current attribute */
  	caddr_t         rdbuf;	/* Buffer to read directory's blocks  */
  	u_int32_t       blsize;
  	u_int32_t       rdsize;	/* Length of data to read from current block */
  	struct attr_indexentry *iep;
  	int             error, res, anamelen, fnamelen;
  	const char     *fname,*aname;
  	u_int32_t       aoff;
  	int attrtype = NTFS_A_DATA;
  	char *attrname = NULL;
  	struct fnode   *nfp;
  	struct vnode   *nvp;
  	enum vtype	f_type;
  
  	error = ntfs_ntget(ip);
  	if (error)
  		return (error);
  
  	error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDXROOT, "$I30", 0, &vap);
  	if (error || (vap->va_flag & NTFS_AF_INRUN))
  		return (ENOTDIR);
  
  	blsize = vap->va_a_iroot->ir_size;
  	rdsize = vap->va_datalen;
  
  	/*
  	 * Divide file name into: foofilefoofilefoofile[:attrspec]
  	 * Store like this:       fname:fnamelen       [aname:anamelen]
  	 */
  	fname = cnp->cn_nameptr;
  	aname = NULL;
  	anamelen = 0;
  	for (fnamelen = 0; fnamelen < cnp->cn_namelen; fnamelen++)
  		if(fname[fnamelen] == ':') {
  			aname = fname + fnamelen + 1;
  			anamelen = cnp->cn_namelen - fnamelen - 1;
  			dprintf(("ntfs_ntlookupfile: %s (%d), attr: %s (%d)\n",
  				fname, fnamelen, aname, anamelen));
  			break;
  		}
  
  	dprintf(("ntfs_ntlookupfile: blksz: %d, rdsz: %d\n", blsize, rdsize));
  
  	rdbuf = kmalloc(blsize, M_TEMP, M_WAITOK);
  
  	error = ntfs_readattr(ntmp, ip, NTFS_A_INDXROOT, "$I30",
  			       0, rdsize, rdbuf, NULL);
  	if (error)
  		goto fail;
  
  	aoff = sizeof(struct attr_indexroot);
  
  	do {
  		iep = (struct attr_indexentry *) (rdbuf + aoff);
  
  		for (; !(iep->ie_flag & NTFS_IEFLAG_LAST) && (rdsize > aoff);
  			aoff += iep->reclen,
  			iep = (struct attr_indexentry *) (rdbuf + aoff))
  		{
  			ddprintf(("scan: %d, %d\n",
  				  (u_int32_t) iep->ie_number,
  				  (u_int32_t) iep->ie_fnametype));
  
  			/* check the name - the case-insensitible check
  			 * has to come first, to break from this for loop
  			 * if needed, so we can dive correctly */
  			res = NTFS_UASTRICMP(iep->ie_fname, iep->ie_fnamelen,
  				fname, fnamelen);
  			if (res > 0) break;
  			if (res < 0) continue;
  
  			if (iep->ie_fnametype == 0 ||
  			    !(ntmp->ntm_flag & NTFS_MFLAG_CASEINS))
  			{
  				res = NTFS_UASTRCMP(iep->ie_fname,
  					iep->ie_fnamelen, fname, fnamelen);
  				if (res != 0) continue;
  			}
  
  			if (aname) {
  				error = ntfs_ntlookupattr(ntmp,
  					aname, anamelen,
  					&attrtype, &attrname);
  				if (error)
  					goto fail;
  			}
  
  			/* Check if we've found ourself */
  			if ((iep->ie_number == ip->i_number) &&
  			    (attrtype == fp->f_attrtype) &&
  			    ((!attrname && !fp->f_attrname) ||
  			     (attrname && fp->f_attrname &&
  			      !strcmp(attrname, fp->f_attrname))))
  			{
  				vref(vp);
  				*vpp = vp;
  				error = 0;
  				goto fail;
  			}
  
  			/* vget node, but don't load it */
  			error = ntfs_vgetex(ntmp->ntm_mountp,
  				   iep->ie_number, attrtype, attrname,
  				   LK_EXCLUSIVE, VG_DONTLOADIN | VG_DONTVALIDFN,
  				   curthread, &nvp);
  
  			/* free the buffer returned by ntfs_ntlookupattr() */
  			if (attrname) {
  				kfree(attrname, M_TEMP);
  				attrname = NULL;
  			}
  
  			if (error)
  				goto fail;
  
  			nfp = VTOF(nvp);
  
  			if (nfp->f_flag & FN_VALID) {
  				*vpp = nvp;
  				goto fail;
  			}
  
  			nfp->f_fflag = iep->ie_fflag;
  			nfp->f_pnumber = iep->ie_fpnumber;
  			nfp->f_times = iep->ie_ftimes;
  
  			if((nfp->f_fflag & NTFS_FFLAG_DIR) &&
  			   (nfp->f_attrtype == NTFS_A_DATA) &&
  			   (nfp->f_attrname == NULL))
  				f_type = VDIR;	
  			else
  				f_type = VREG;	
  
  			nvp->v_type = f_type;
  
  			if ((nfp->f_attrtype == NTFS_A_DATA) &&
  			    (nfp->f_attrname == NULL))
  			{
  				/* Opening default attribute */
  				nfp->f_size = iep->ie_fsize;
  				nfp->f_allocated = iep->ie_fallocated;
  				nfp->f_flag |= FN_PRELOADED;
  			} else {
  				error = ntfs_filesize(ntmp, nfp,
  					    &nfp->f_size, &nfp->f_allocated);
  				if (error) {
  					vput(nvp);
  					goto fail;
  				}
  			}
  			nfp->f_flag &= ~FN_VALID;
  
  			/*
  			 * Normal files use the buffer cache
  			 */
  			if (nvp->v_type == VREG)
  				vinitvmio(nvp, nfp->f_size, PAGE_SIZE, -1);
  			*vpp = nvp;
  			goto fail;
  		}
  
  		/* Dive if possible */
  		if (iep->ie_flag & NTFS_IEFLAG_SUBNODE) {
  			dprintf(("ntfs_ntlookupfile: diving\n"));
  
  			cn = *(cn_t *) (rdbuf + aoff +
  					iep->reclen - sizeof(cn_t));
  			rdsize = blsize;
  
  			error = ntfs_readattr(ntmp, ip, NTFS_A_INDX, "$I30",
  					ntfs_cntob(cn), rdsize, rdbuf, NULL);
  			if (error)
  				goto fail;
  
  			error = ntfs_procfixups(ntmp, NTFS_INDXMAGIC,
  						rdbuf, rdsize);
  			if (error)
  				goto fail;
  
  			aoff = (((struct attr_indexalloc *) rdbuf)->ia_hdrsize +
  				0x18);
  		} else {
  			dprintf(("ntfs_ntlookupfile: nowhere to dive :-(\n"));
  			error = ENOENT;
  			break;
  		}
  	} while (1);
  
  	dprintf(("finish\n"));
  
  fail:
  	if (attrname) kfree(attrname, M_TEMP);
  	ntfs_ntvattrrele(vap);
  	ntfs_ntput(ip);
  	kfree(rdbuf, M_TEMP);
  	return (error);
  }
  
  /*
   * Check if name type is permitted to show.
   */
  int
  ntfs_isnamepermitted(struct ntfsmount *ntmp, struct attr_indexentry *iep)
  {
  	if (ntmp->ntm_flag & NTFS_MFLAG_ALLNAMES)
  		return 1;
  
  	switch (iep->ie_fnametype) {
  	case 2:
  		ddprintf(("ntfs_isnamepermitted: skipped DOS name\n"));
  		return 0;
  	case 0: case 1: case 3:
  		return 1;
  	default:
  		kprintf("ntfs_isnamepermitted: " \
  		       "WARNING! Unknown file name type: %d\n",
  		       iep->ie_fnametype);
  		break;
  	}
  	return 0;
  }
  
  /*
   * Read ntfs dir like stream of attr_indexentry, not like btree of them.
   * This is done by scaning $BITMAP:$I30 for busy clusters and reading them.
   * Ofcouse $INDEX_ROOT:$I30 is read before. Last read values are stored in
   * fnode, so we can skip toward record number num almost immediatly.
   * Anyway this is rather slow routine. The problem is that we don't know
   * how many records are there in $INDEX_ALLOCATION:$I30 block.
   */
  int
  ntfs_ntreaddir(struct ntfsmount *ntmp, struct fnode *fp,
  	       u_int32_t num, struct attr_indexentry **riepp)
  {
  	struct ntnode  *ip = FTONT(fp);
  	struct ntvattr *vap = NULL;	/* IndexRoot attribute */
  	struct ntvattr *bmvap = NULL;	/* BitMap attribute */
  	struct ntvattr *iavap = NULL;	/* IndexAllocation attribute */
  	caddr_t         rdbuf;		/* Buffer to read directory's blocks  */
  	u_char         *bmp = NULL;	/* Bitmap */
  	u_int32_t       blsize;		/* Index allocation size (2048) */
  	u_int32_t       rdsize;		/* Length of data to read */
  	u_int32_t       attrnum;	/* Current attribute type */
  	u_int32_t       cpbl = 1;	/* Clusters per directory block */
  	u_int32_t       blnum;
  	struct attr_indexentry *iep;
  	int             error = ENOENT;
  	u_int32_t       aoff, cnum;
  
  	dprintf(("ntfs_ntreaddir: read ino: %"PRId64", num: %d\n", ip->i_number, num));
  	error = ntfs_ntget(ip);
  	if (error)
  		return (error);
  
  	error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDXROOT, "$I30", 0, &vap);
  	if (error)
  		return (ENOTDIR);
  
  	if (fp->f_dirblbuf == NULL) {
  		fp->f_dirblsz = vap->va_a_iroot->ir_size;
  		fp->f_dirblbuf = kmalloc(max(vap->va_datalen, fp->f_dirblsz),
  					 M_NTFSDIR, M_WAITOK);
  	}
  
  	blsize = fp->f_dirblsz;
  	rdbuf = fp->f_dirblbuf;
  
  	dprintf(("ntfs_ntreaddir: rdbuf: 0x%p, blsize: %d\n", rdbuf, blsize));
  
  	if (vap->va_a_iroot->ir_flag & NTFS_IRFLAG_INDXALLOC) {
  		error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDXBITMAP, "$I30",
  					0, &bmvap);
  		if (error) {
  			error = ENOTDIR;
  			goto fail;
  		}
  		bmp = kmalloc(bmvap->va_datalen, M_TEMP, M_WAITOK);
  		error = ntfs_readattr(ntmp, ip, NTFS_A_INDXBITMAP, "$I30", 0,
  				       bmvap->va_datalen, bmp, NULL);
  		if (error)
  			goto fail;
  
  		error = ntfs_ntvattrget(ntmp, ip, NTFS_A_INDX, "$I30",
  					0, &iavap);
  		if (error) {
  			error = ENOTDIR;
  			goto fail;
  		}
  		cpbl = ntfs_btocn(blsize + ntfs_cntob(1) - 1);
  		dprintf(("ntfs_ntreaddir: indexalloc: %d, cpbl: %d\n",
  			 iavap->va_datalen, cpbl));
  	} else {
  		dprintf(("ntfs_ntreadidir: w/o BitMap and IndexAllocation\n"));
  		iavap = bmvap = NULL;
  		bmp = NULL;
  	}
  
  	/* Try use previous values */
  	if ((fp->f_lastdnum < num) && (fp->f_lastdnum != 0)) {
  		attrnum = fp->f_lastdattr;
  		aoff = fp->f_lastdoff;
  		blnum = fp->f_lastdblnum;
  		cnum = fp->f_lastdnum;
  	} else {
  		attrnum = NTFS_A_INDXROOT;
  		aoff = sizeof(struct attr_indexroot);
  		blnum = 0;
  		cnum = 0;
  	}
  
  	do {
  		dprintf(("ntfs_ntreaddir: scan: 0x%x, %d, %d, %d, %d\n",
  			 attrnum, (u_int32_t) blnum, cnum, num, aoff));
  		rdsize = (attrnum == NTFS_A_INDXROOT) ? vap->va_datalen : blsize;
  		error = ntfs_readattr(ntmp, ip, attrnum, "$I30",
  				ntfs_cntob(blnum * cpbl), rdsize, rdbuf, NULL);
  		if (error)
  			goto fail;
  
  		if (attrnum == NTFS_A_INDX) {
  			error = ntfs_procfixups(ntmp, NTFS_INDXMAGIC,
  						rdbuf, rdsize);
  			if (error)
  				goto fail;
  		}
  		if (aoff == 0)
  			aoff = (attrnum == NTFS_A_INDX) ?
  				(0x18 + ((struct attr_indexalloc *) rdbuf)->ia_hdrsize) :
  				sizeof(struct attr_indexroot);
  
  		iep = (struct attr_indexentry *) (rdbuf + aoff);
  		for (; !(iep->ie_flag & NTFS_IEFLAG_LAST) && (rdsize > aoff);
  			aoff += iep->reclen,
  			iep = (struct attr_indexentry *) (rdbuf + aoff))
  		{
  			if (!ntfs_isnamepermitted(ntmp, iep)) continue;
  
  			if (cnum >= num) {
  				fp->f_lastdnum = cnum;
  				fp->f_lastdoff = aoff;
  				fp->f_lastdblnum = blnum;
  				fp->f_lastdattr = attrnum;
  
  				*riepp = iep;
  
  				error = 0;
  				goto fail;
  			}
  			cnum++;
  		}
  
  		if (iavap) {
  			if (attrnum == NTFS_A_INDXROOT)
  				blnum = 0;
  			else
  				blnum++;
  
  			while (ntfs_cntob(blnum * cpbl) < iavap->va_datalen) {
  				if (bmp[blnum >> 3] & (1 << (blnum & 3)))
  					break;
  				blnum++;
  			}
  
  			attrnum = NTFS_A_INDX;
  			aoff = 0;
  			if (ntfs_cntob(blnum * cpbl) >= iavap->va_datalen)
  				break;
  			dprintf(("ntfs_ntreaddir: blnum: %d\n", (u_int32_t) blnum));
  		}
  	} while (iavap);
  
  	*riepp = NULL;
  	fp->f_lastdnum = 0;
  
  fail:
  	if (vap)
  		ntfs_ntvattrrele(vap);
  	if (bmvap)
  		ntfs_ntvattrrele(bmvap);
  	if (iavap)
  		ntfs_ntvattrrele(iavap);
  	if (bmp)
  		kfree(bmp, M_TEMP);
  	ntfs_ntput(ip);
  	return (error);
  }
  
  /*
   * Convert NTFS times that are in 100 ns units and begins from
   * 1601 Jan 1 into unix times.
   */
  struct timespec
  ntfs_nttimetounix(u_int64_t nt)
  {
  	struct timespec t;
  
  	/* WindowNT times are in 100 ns and from 1601 Jan 1 */
  	t.tv_nsec = (nt % (1000 * 1000 * 10)) * 100;
  	t.tv_sec = nt / (1000 * 1000 * 10) -
  		369LL * 365LL * 24LL * 60LL * 60LL -
  		89LL * 1LL * 24LL * 60LL * 60LL;
  	return (t);
  }
  
  /*
   * Get file times from NTFS_A_NAME attribute.
   */
  int
  ntfs_times(struct ntfsmount *ntmp, struct ntnode *ip, ntfs_times_t *tm)
  {
  	struct ntvattr *vap;
  	int             error;
  
  	dprintf(("ntfs_times: ino: %"PRId64"...\n", ip->i_number));
  
  	error = ntfs_ntget(ip);
  	if (error)
  		return (error);
  
  	error = ntfs_ntvattrget(ntmp, ip, NTFS_A_NAME, NULL, 0, &vap);
  	if (error) {
  		ntfs_ntput(ip);
  		return (error);
  	}
  	*tm = vap->va_a_name->n_times;
  	ntfs_ntvattrrele(vap);
  	ntfs_ntput(ip);
  
  	return (0);
  }
  
  /*
   * Get file sizes from corresponding attribute. 
   * 
   * ntnode under fnode should be locked.
   */
  int
  ntfs_filesize(struct ntfsmount *ntmp, struct fnode *fp, u_int64_t *size,
  	      u_int64_t *bytes)
  {
  	struct ntvattr *vap;
  	struct ntnode *ip = FTONT(fp);
  	u_int64_t       sz, bn;
  	int             error;
  
  	dprintf(("ntfs_filesize: ino: %"PRId64"\n", ip->i_number));
  
  	error = ntfs_ntvattrget(ntmp, ip,
  		fp->f_attrtype, fp->f_attrname, 0, &vap);
  	if (error)
  		return (error);
  
  	bn = vap->va_allocated;
  	sz = vap->va_datalen;
  
  	dprintf(("ntfs_filesize: %d bytes (%d bytes allocated)\n",
  		(u_int32_t) sz, (u_int32_t) bn));
  
  	if (size)
  		*size = sz;
  	if (bytes)
  		*bytes = bn;
  
  	ntfs_ntvattrrele(vap);
  
  	return (0);
  }
  
  /*
   * This is one of write routine.
   */
  int
  ntfs_writeattr_plain(struct ntfsmount *ntmp, struct ntnode *ip,
  		     u_int32_t attrnum, char *attrname,	off_t roff,
  		     size_t rsize, void *rdata,	size_t *initp,
  		     struct uio *uio)
  {
  	size_t          init;
  	int             error = 0;
  	off_t           off = roff, left = rsize, towrite;
  	caddr_t         data = rdata;
  	struct ntvattr *vap;
  	*initp = 0;
  
  	while (left) {
  		error = ntfs_ntvattrget(ntmp, ip, attrnum, attrname,
  					ntfs_btocn(off), &vap);
  		if (error)
  			return (error);
  		towrite = min(left, ntfs_cntob(vap->va_vcnend + 1) - off);
  		ddprintf(("ntfs_writeattr_plain: o: %d, s: %d (%d - %d)\n",
  			 (u_int32_t) off, (u_int32_t) towrite,
  			 (u_int32_t) vap->va_vcnstart,
  			 (u_int32_t) vap->va_vcnend));
  		error = ntfs_writentvattr_plain(ntmp, ip, vap,
  					 off - ntfs_cntob(vap->va_vcnstart),
  					 towrite, data, &init, uio);
  		if (error) {
  			kprintf("ntfs_writeattr_plain: " \
  			       "ntfs_writentvattr_plain failed: o: %d, s: %d\n",
  			       (u_int32_t) off, (u_int32_t) towrite);
  			kprintf("ntfs_writeattr_plain: attrib: %d - %d\n",
  			       (u_int32_t) vap->va_vcnstart, 
  			       (u_int32_t) vap->va_vcnend);
  			ntfs_ntvattrrele(vap);
  			break;
  		}
  		ntfs_ntvattrrele(vap);
  		left -= towrite;
  		off += towrite;
  		data = data + towrite;
  		*initp += init;
  	}
  
  	return (error);
  }
  
  /*
   * This is one of write routine.
   *
   * ntnode should be locked.
   */
  int
  ntfs_writentvattr_plain(struct ntfsmount *ntmp,	struct ntnode *ip,
  			struct ntvattr *vap, off_t roff, size_t rsize,
  			void *rdata, size_t *initp, struct uio *uio)
  {
  	int             error = 0;
  	int             off;
  	int             cnt;
  	cn_t            ccn, ccl, cn, left, cl;
  	caddr_t         data = rdata;
  	struct buf     *bp;
  	size_t          tocopy;
  
  	*initp = 0;
  
  	if ((vap->va_flag & NTFS_AF_INRUN) == 0) {
  		kprintf("ntfs_writevattr_plain: CAN'T WRITE RES. ATTRIBUTE\n");
  		return ENOTTY;
  	}
  
  	ddprintf(("ntfs_writentvattr_plain: data in run: %ld chains\n",
  		 vap->va_vruncnt));
  
  	off = roff;
  	left = rsize;
  	ccl = 0;
  	ccn = 0;
  	cnt = 0;
  	for (; left && (cnt < vap->va_vruncnt); cnt++) {
  		ccn = vap->va_vruncn[cnt];
  		ccl = vap->va_vruncl[cnt];
  
  		ddprintf(("ntfs_writentvattr_plain: " \
  			 "left %d, cn: 0x%x, cl: %d, off: %d\n", \
  			 (u_int32_t) left, (u_int32_t) ccn, \
  			 (u_int32_t) ccl, (u_int32_t) off));
  
  		if (ntfs_cntob(ccl) < off) {
  			off -= ntfs_cntob(ccl);
  			cnt++;
  			continue;
  		}
  		if (!ccn && ip->i_number != NTFS_BOOTINO)
  			continue; /* XXX */
  
  		ccl -= ntfs_btocn(off);
  		cn = ccn + ntfs_btocn(off);
  		off = ntfs_btocnoff(off);
  
  		while (left && ccl) {
  #if defined(__DragonFly__)
  			tocopy = min(left,
  				  min(ntfs_cntob(ccl) - off, MAXBSIZE - off));
  #else
  			/* under NetBSD, bread() can read
  			 * maximum one block worth of data */
  			tocopy = min(left, ntmp->ntm_bps - off);
  #endif
  			cl = ntfs_btocl(tocopy + off);
  			ddprintf(("ntfs_writentvattr_plain: write: " \
  				"cn: 0x%x cl: %d, off: %d len: %d, left: %d\n",
  				(u_int32_t) cn, (u_int32_t) cl, 
  				(u_int32_t) off, (u_int32_t) tocopy, 
  				(u_int32_t) left));
  			if (off == 0 && tocopy == ntfs_cntob(cl) &&
  			    uio->uio_segflg != UIO_NOCOPY) {
  				bp = getblk(ntmp->ntm_devvp, ntfs_cntodoff(cn),
  					    ntfs_cntob(cl), 0, 0);
  				clrbuf(bp);
  			} else {
  				error = bread(ntmp->ntm_devvp,
  					      ntfs_cntodoff(cn),
  					      ntfs_cntob(cl), &bp);
  				if (error) {
  					brelse(bp);
  					return (error);
  				}
  			}
  			if (uio)
  				uiomove(bp->b_data + off, tocopy, uio);
  			else
  				memcpy(bp->b_data + off, data, tocopy);
  			bawrite(bp);
  			data = data + tocopy;
  			*initp += tocopy;
  			off = 0;
  			left -= tocopy;
  			cn += cl;
  			ccl -= cl;
  		}
  	}
  
  	if (left) {
  		kprintf("ntfs_writentvattr_plain: POSSIBLE RUN ERROR\n");
  		error = EINVAL;
  	}
  
  	return (error);
  }
  
  /*
   * This is one of read routines.
   *
   * ntnode should be locked.
   */
  int
  ntfs_readntvattr_plain(struct ntfsmount *ntmp, struct ntnode *ip,
  		       struct ntvattr *vap, off_t roff, size_t rsize,
  		       void *rdata, size_t *initp, struct uio *uio)
  {
  	int             error = 0;
  	int             off;
  
  	*initp = 0;
  	if (vap->va_flag & NTFS_AF_INRUN) {
  		int             cnt;
  		cn_t            ccn, ccl, cn, left, cl;
  		caddr_t         data = rdata;
  		struct buf     *bp;
  		size_t          tocopy;
  
  		ddprintf(("ntfs_readntvattr_plain: data in run: %ld chains\n",
  			 vap->va_vruncnt));
  
  		off = roff;
  		left = rsize;
  		ccl = 0;
  		ccn = 0;
  		cnt = 0;
  		while (left && (cnt < vap->va_vruncnt)) {
  			ccn = vap->va_vruncn[cnt];
  			ccl = vap->va_vruncl[cnt];
  
  			ddprintf(("ntfs_readntvattr_plain: " \
  				 "left %d, cn: 0x%x, cl: %d, off: %d\n", \
  				 (u_int32_t) left, (u_int32_t) ccn, \
  				 (u_int32_t) ccl, (u_int32_t) off));
  
  			if (ntfs_cntob(ccl) < off) {
  				off -= ntfs_cntob(ccl);
  				cnt++;
  				continue;
  			}
  			if (ccn || ip->i_number == NTFS_BOOTINO) {
  				ccl -= ntfs_btocn(off);
  				cn = ccn + ntfs_btocn(off);
  				off = ntfs_btocnoff(off);
  
  				while (left && ccl) {
  #if defined(__DragonFly__)
  					tocopy = min(left,
  						  min(ntfs_cntob(ccl) - off,
  						      MAXBSIZE - off));
  #else
  					/* under NetBSD, bread() can read
  					 * maximum one block worth of data */
  					tocopy = min(left,
  						ntmp->ntm_bps - off);
  #endif
  					cl = ntfs_btocl(tocopy + off);
  					ddprintf(("ntfs_readntvattr_plain: " \
  						"read: cn: 0x%x cl: %d, " \
  						"off: %d len: %d, left: %d\n",
  						(u_int32_t) cn, 
  						(u_int32_t) cl, 
  						(u_int32_t) off, 
  						(u_int32_t) tocopy, 
  						(u_int32_t) left));
  					error = bread(ntmp->ntm_devvp,
  						      ntfs_cntodoff(cn),
  						      ntfs_cntob(cl),
  						      &bp);
  					if (error) {
  						brelse(bp);
  						return (error);
  					}
  					if (uio) {
  						uiomove(bp->b_data + off,
  							tocopy, uio);
  					} else {
  						memcpy(data, bp->b_data + off,
  							tocopy);
  					}
  					brelse(bp);
  					data = data + tocopy;
  					*initp += tocopy;
  					off = 0;
  					left -= tocopy;
  					cn += cl;
  					ccl -= cl;
  				}
  			} else {
  				tocopy = min(left, ntfs_cntob(ccl) - off);
  				ddprintf(("ntfs_readntvattr_plain: "
  					"hole: ccn: 0x%x ccl: %d, off: %d, " \
  					" len: %d, left: %d\n", 
  					(u_int32_t) ccn, (u_int32_t) ccl, 
  					(u_int32_t) off, (u_int32_t) tocopy, 
  					(u_int32_t) left));
  				left -= tocopy;
  				off = 0;
  				if (uio) {
  					size_t remains = tocopy;
  					for(; remains; remains++)
  						uiomove("", 1, uio);
  				} else 
  					bzero(data, tocopy);
  				data = data + tocopy;
  			}
  			cnt++;
  		}
  		if (left) {
  			kprintf("ntfs_readntvattr_plain: POSSIBLE RUN ERROR\n");
  			error = E2BIG;
  		}
  	} else {
  		ddprintf(("ntfs_readnvattr_plain: data is in mft record\n"));
  		if (uio) 
  			uiomove(vap->va_datap + roff, rsize, uio);
  		else
  			memcpy(rdata, vap->va_datap + roff, rsize);
  		*initp += rsize;
  	}
  
  	return (error);
  }
  
  /*
   * This is one of read routines.
   */
  int
  ntfs_readattr_plain(struct ntfsmount *ntmp, struct ntnode *ip,
  		    u_int32_t attrnum, char *attrname, off_t roff,
  		    size_t rsize, void *rdata, size_t * initp,
  		    struct uio *uio)
  {
  	size_t          init;
  	int             error = 0;
  	off_t           off = roff, left = rsize, toread;
  	caddr_t         data = rdata;
  	struct ntvattr *vap;
  	*initp = 0;
  
  	while (left) {
  		error = ntfs_ntvattrget(ntmp, ip, attrnum, attrname,
  					ntfs_btocn(off), &vap);
  		if (error)
  			return (error);
  		toread = min(left, ntfs_cntob(vap->va_vcnend + 1) - off);
  		ddprintf(("ntfs_readattr_plain: o: %d, s: %d (%d - %d)\n",
  			 (u_int32_t) off, (u_int32_t) toread,
  			 (u_int32_t) vap->va_vcnstart,
  			 (u_int32_t) vap->va_vcnend));
  		error = ntfs_readntvattr_plain(ntmp, ip, vap,
  					 off - ntfs_cntob(vap->va_vcnstart),
  					 toread, data, &init, uio);
  		if (error) {
  			kprintf("ntfs_readattr_plain: " \
  			       "ntfs_readntvattr_plain failed: o: %d, s: %d\n",
  			       (u_int32_t) off, (u_int32_t) toread);
  			kprintf("ntfs_readattr_plain: attrib: %d - %d\n",
  			       (u_int32_t) vap->va_vcnstart, 
  			       (u_int32_t) vap->va_vcnend);
  			ntfs_ntvattrrele(vap);
  			break;
  		}
  		ntfs_ntvattrrele(vap);
  		left -= toread;
  		off += toread;
  		data = data + toread;
  		*initp += init;
  	}
  
  	return (error);
  }
  
  /*
   * This is one of read routines.
   */
  int
  ntfs_readattr(struct ntfsmount *ntmp, struct ntnode *ip, u_int32_t attrnum,
  	      char *attrname, off_t roff, size_t rsize, void *rdata,
  	      struct uio *uio)
  {
  	int             error = 0;
  	struct ntvattr *vap;
  	size_t          init;
  
  	ddprintf(("ntfs_readattr: reading %"PRId64": 0x%x, from %d size %d bytes\n",
  	       ip->i_number, attrnum, (u_int32_t) roff, (u_int32_t) rsize));
  
  	error = ntfs_ntvattrget(ntmp, ip, attrnum, attrname, 0, &vap);
  	if (error)
  		return (error);
  
  	if ((roff > vap->va_datalen) ||
  	    (roff + rsize > vap->va_datalen)) {
  		ddprintf(("ntfs_readattr: offset too big\n"));
  		ntfs_ntvattrrele(vap);
  		return (E2BIG);
  	}
  	if (vap->va_compression && vap->va_compressalg) {
  		u_int8_t       *cup;
  		u_int8_t       *uup;
  		off_t           off, left = rsize, tocopy;
  		caddr_t         data = rdata;
  		cn_t            cn;
  
  		ddprintf(("ntfs_ntreadattr: compression: %d\n",
  			 vap->va_compressalg));
  
  		cup = kmalloc(ntfs_cntob(NTFS_COMPUNIT_CL), M_NTFSDECOMP,
  			      M_WAITOK);
  		uup = kmalloc(ntfs_cntob(NTFS_COMPUNIT_CL), M_NTFSDECOMP,
  			      M_WAITOK);
  
  		cn = (ntfs_btocn(roff)) & (~(NTFS_COMPUNIT_CL - 1));
  		off = roff - ntfs_cntob(cn);
  
  		while (left) {
  			error = ntfs_readattr_plain(ntmp, ip, attrnum,
  						  attrname, ntfs_cntob(cn),
  						  ntfs_cntob(NTFS_COMPUNIT_CL),
  						  cup, &init, NULL);
  			if (error)
  				break;
  
  			tocopy = min(left, ntfs_cntob(NTFS_COMPUNIT_CL) - off);
  
  			if (init == ntfs_cntob(NTFS_COMPUNIT_CL)) {
  				if (uio)
  					uiomove(cup + off, tocopy, uio);
  				else
  					memcpy(data, cup + off, tocopy);
  			} else if (init == 0) {
  				if (uio) {
  					size_t remains = tocopy;
  					for(; remains; remains--)
  						uiomove("", 1, uio);
  				}
  				else
  					bzero(data, tocopy);
  			} else {
  				error = ntfs_uncompunit(ntmp, uup, cup);
  				if (error)
  					break;
  				if (uio)
  					uiomove(uup + off, tocopy, uio);
  				else
  					memcpy(data, uup + off, tocopy);
  			}
  
  			left -= tocopy;
  			data = data + tocopy;
  			off += tocopy - ntfs_cntob(NTFS_COMPUNIT_CL);
  			cn += NTFS_COMPUNIT_CL;
  		}
  
  		kfree(uup, M_NTFSDECOMP);
  		kfree(cup, M_NTFSDECOMP);
  	} else
  		error = ntfs_readattr_plain(ntmp, ip, attrnum, attrname,
  					     roff, rsize, rdata, &init, uio);
  	ntfs_ntvattrrele(vap);
  	return (error);
  }
  
  #if 0 /* UNUSED */
  int
  ntfs_parserun(cn_t *cn, cn_t *cl, u_int8_t *run, u_long len, u_long *off)
  {
  	u_int8_t        sz;
  	int             i;
  
  	if (NULL == run) {
  		kprintf("ntfs_parsetun: run == NULL\n");
  		return (EINVAL);
  	}
  	sz = run[(*off)++];
  	if (0 == sz) {
  		kprintf("ntfs_parserun: trying to go out of run\n");
  		return (E2BIG);
  	}
  	*cl = 0;
  	if ((sz & 0xF) > 8 || (*off) + (sz & 0xF) > len) {
  		kprintf("ntfs_parserun: " \
  		       "bad run: length too big: sz: 0x%02x (%ld < %ld + sz)\n",
  		       sz, len, *off);
  		return (EINVAL);
  	}
  	for (i = 0; i < (sz & 0xF); i++)
  		*cl += (u_int32_t) run[(*off)++] << (i << 3);
  
  	sz >>= 4;
  	if ((sz & 0xF) > 8 || (*off) + (sz & 0xF) > len) {
  		kprintf("ntfs_parserun: " \
  		       "bad run: length too big: sz: 0x%02x (%ld < %ld + sz)\n",
  		       sz, len, *off);
  		return (EINVAL);
  	}
  	for (i = 0; i < (sz & 0xF); i++)
  		*cn += (u_int32_t) run[(*off)++] << (i << 3);
  
  	return (0);
  }
  #endif
  
  /*
   * Process fixup routine on given buffer.
   */
  int
  ntfs_procfixups(struct ntfsmount *ntmp, u_int32_t magic, caddr_t buf,
  		size_t len)
  {
  	struct fixuphdr *fhp = (struct fixuphdr *) buf;
  	int             i;
  	u_int16_t       fixup;
  	u_int16_t      *fxp;
  	u_int16_t      *cfxp;
  
  	if (fhp->fh_magic != magic) {
  		kprintf("ntfs_procfixups: magic doesn't match: %08x != %08x\n",
  		       fhp->fh_magic, magic);
  		return (EINVAL);
  	}
  	if ((fhp->fh_fnum - 1) * ntmp->ntm_bps != len) {
  		kprintf("ntfs_procfixups: " \
  		       "bad fixups number: %d for %ld bytes block\n", 
  		       fhp->fh_fnum, (long)len);	/* XXX kprintf kludge */
  		return (EINVAL);
  	}
  	if (fhp->fh_foff >= ntmp->ntm_spc * ntmp->ntm_mftrecsz * ntmp->ntm_bps) {
  		kprintf("ntfs_procfixups: invalid offset: %x", fhp->fh_foff);
  		return (EINVAL);
  	}
  	fxp = (u_int16_t *) (buf + fhp->fh_foff);
  	cfxp = (u_int16_t *) (buf + ntmp->ntm_bps - 2);
  	fixup = *fxp++;
  	for (i = 1; i < fhp->fh_fnum; i++, fxp++) {
  		if (*cfxp != fixup) {
  			kprintf("ntfs_procfixups: fixup %d doesn't match\n", i);
  			return (EINVAL);
  		}
  		*cfxp = *fxp;
  		cfxp = (u_int16_t *)(((caddr_t) cfxp) + ntmp->ntm_bps);
  	}
  	return (0);
  }
  
  #if 0 /* UNUSED */
  int
  ntfs_runtocn(cn_t *cn,	struct ntfsmount *ntmp, u_int8_t *run, u_long len,
  	     cn_t vcn)
  {
  	cn_t            ccn = 0;
  	cn_t            ccl = 0;
  	u_long          off = 0;
  	int             error = 0;
  
  #if NTFS_DEBUG
  	int             i;
  	kprintf("ntfs_runtocn: run: 0x%p, %ld bytes, vcn:%ld\n",
  		run, len, (u_long) vcn);
  	kprintf("ntfs_runtocn: run: ");
  	for (i = 0; i < len; i++)
  		kprintf("0x%02x ", run[i]);
  	kprintf("\n");
  #endif
  
  	if (NULL == run) {
  		kprintf("ntfs_runtocn: run == NULL\n");
  		return (EINVAL);
  	}
  	do {
  		if (run[off] == 0) {
  			kprintf("ntfs_runtocn: vcn too big\n");
  			return (E2BIG);
  		}
  		vcn -= ccl;
  		error = ntfs_parserun(&ccn, &ccl, run, len, &off);
  		if (error) {
  			kprintf("ntfs_runtocn: ntfs_parserun failed\n");
  			return (error);
  		}
  	} while (ccl <= vcn);
  	*cn = ccn + vcn;
  	return (0);
  }
  #endif
  
  /*
   * this initializes toupper table & dependant variables to be ready for
   * later work
   */
  void
  ntfs_toupper_init(void)
  {
  	ntfs_toupper_tab = NULL;
  	lockinit(&ntfs_toupper_lock, "ntfs_toupper", 0, 0);
  	ntfs_toupper_usecount = 0;
  }
  
  /*
   * if the ntfs_toupper_tab[] is filled already, just raise use count;
   * otherwise read the data from the filesystem we are currently mounting
   */
  int
  ntfs_toupper_use(struct mount *mp, struct ntfsmount *ntmp)
  {
  	int error = 0;
  	struct vnode *vp;
  
  	/* get exclusive access */
  	LOCKMGR(&ntfs_toupper_lock, LK_EXCLUSIVE);
  	
  	/* only read the translation data from a file if it hasn't been
  	 * read already */
  	if (ntfs_toupper_tab)
  		goto out;
  
  	/*
  	 * Read in Unicode lowercase -> uppercase translation file.
  	 * XXX for now, just the first 256 entries are used anyway,
  	 * so don't bother reading more
  	 */
  	ntfs_toupper_tab = kmalloc(65536 * sizeof(wchar), M_NTFSRDATA,
  				   M_WAITOK);
  
  	if ((error = VFS_VGET(mp, NULL, NTFS_UPCASEINO, &vp)))
  		goto out;
  	error = ntfs_readattr(ntmp, VTONT(vp), NTFS_A_DATA, NULL,
  			0, 65536*sizeof(wchar), (char *) ntfs_toupper_tab, NULL);
  	vput(vp);
  
      out:
  	ntfs_toupper_usecount++;
  	LOCKMGR(&ntfs_toupper_lock, LK_RELEASE);
  	return (error);
  }
  
  /*
   * lower the use count and if it reaches zero, free the memory
   * tied by toupper table
   */
  void
  ntfs_toupper_unuse(void)
  {
  	/* get exclusive access */
  	LOCKMGR(&ntfs_toupper_lock, LK_EXCLUSIVE);
  
  	ntfs_toupper_usecount--;
  	if (ntfs_toupper_usecount == 0) {
  		kfree(ntfs_toupper_tab, M_NTFSRDATA);
  		ntfs_toupper_tab = NULL;
  	}
  #ifdef DIAGNOSTIC
  	else if (ntfs_toupper_usecount < 0) {
  		panic("ntfs_toupper_unuse(): use count negative: %d\n",
  			ntfs_toupper_usecount);
  	}
  #endif
  	
  	/* release the lock */
  	LOCKMGR(&ntfs_toupper_lock, LK_RELEASE);
  } 
  
  int
  ntfs_u28_init(struct ntfsmount *ntmp, wchar *u2w, char *cs_local,
  	 char *cs_ntfs)
  {
  	char ** u28;
  	int i, j, h, l;
  
  	if (ntfs_iconv && cs_local) {
  		ntfs_iconv->open(cs_local, cs_ntfs, &ntmp->ntm_ic_u2l);
  		return (0);
  	}
  
  	u28 = kmalloc(256 * sizeof(char *), M_TEMP, M_WAITOK | M_ZERO);
  
  	for (i=0; i<256; i++) {
  		h = (u2w[i] >> 8) & 0xFF;
  		l = (u2w[i]) &0xFF;
  
  		if (u28[h] == NULL) {
  			u28[h] = kmalloc(256 * sizeof(char), M_TEMP, M_WAITOK);
  			for (j=0; j<256; j++)
  				u28[h][j] = '_';
  		}
  
  		u28[h][l] = i & 0xFF;
  	}
  
  	ntmp->ntm_u28 = u28;
  
  	return (0);
  }
  
  int
  ntfs_u28_uninit(struct ntfsmount *ntmp)
  {
  	char ** u28;
  	int i;
  
  	if (ntmp->ntm_u28 == NULL) {
  		if (ntfs_iconv && ntmp->ntm_ic_u2l) {
  			ntfs_iconv->close(ntmp->ntm_ic_u2l);
  		}
  		return (0);
  	}
  
  	if (ntmp->ntm_u28 == NULL)
  		return (0);
  
  	u28 = ntmp->ntm_u28;
  
  	for (i=0; i<256; i++)
  		if (u28[i] != NULL)
  			kfree(u28[i], M_TEMP);
  
  	kfree(u28, M_TEMP);
  
  	return (0);
  }
  
  int
  ntfs_82u_init(struct ntfsmount *ntmp, char *cs_local, char *cs_ntfs)
  
  {
  	wchar * _82u;
  	int i;
  
  	if (ntfs_iconv && cs_local) {
  		ntfs_iconv->open(cs_ntfs, cs_local, &ntmp->ntm_ic_l2u);
  		return (0);
  	}
  
  	_82u = kmalloc(256 * sizeof(wchar), M_TEMP, M_WAITOK);
  
  	for (i=0; i<256; i++)
  		_82u[i] = i;
  
  	ntmp->ntm_82u = _82u;
  
  	return (0);
  }
  
  int
  ntfs_82u_uninit(struct ntfsmount *ntmp)
  {
  	if (ntmp->ntm_82u == NULL) {
  		if (ntfs_iconv && ntmp->ntm_ic_l2u) {
  			ntfs_iconv->close(ntmp->ntm_ic_l2u);
  		}
  		return (0);
  	}
  
  	kfree(ntmp->ntm_82u, M_TEMP);
  	return (0);
  }
  
  /*
   * maps the Unicode char to 8bit equivalent
   * XXX currently only gets lower 8bit from the Unicode char
   * and substitutes a '_' for it if the result would be '\0';
   * something better has to be definitely though out
   */
  wchar
  ntfs_u28(struct ntfsmount *ntmp, wchar wc)
  {
  	char *p, *outp, inbuf[3], outbuf[3];
  	size_t ilen, olen;
  
  	if (ntfs_iconv && ntmp->ntm_ic_u2l) {
  		ilen = olen = 2;
  		inbuf[0] = (char)(wc>>8);
  		inbuf[1] = (char)wc;
  		inbuf[2] = '\0';
  		p = inbuf;
  		outp = outbuf;
  		ntfs_iconv->convchr(ntmp->ntm_ic_u2l, (const char **)&p, &ilen,
  				    &outp, &olen);
  		if (olen == 1) {
  			return ((wchar)(outbuf[0]&0xFF));
  		} else if (olen == 0) {
  			return ((wchar)((outbuf[0]<<8) | (outbuf[1]&0xFF)));
  		}
  		return ('?');
  	}
  
  	p = ntmp->ntm_u28[(wc>>8)&0xFF];
  	if (p == NULL)
  		return ('_');
  	return (p[wc&0xFF]);
  }
  
  wchar
  ntfs_82u(struct ntfsmount *ntmp,
  	wchar wc,
  	int *len)
  {
  	char *p, *outp, inbuf[3], outbuf[3];
  	wchar uc;
  	size_t ilen, olen;
  
  	if (ntfs_iconv && ntmp->ntm_ic_l2u) {
  		ilen = (size_t)*len;
  		olen = 2;
  
  		inbuf[0] = (char)(wc>>8);
  		inbuf[1] = (char)wc;
  		inbuf[2] = '\0';
  		p = inbuf;
  		outp = outbuf;
  		ntfs_iconv->convchr(ntmp->ntm_ic_l2u, (const char **)&p, &ilen,
  				    &outp, &olen);
  		*len -= (int)ilen;
  		uc = (wchar)((outbuf[0]<<8) | (outbuf[1]&0xFF));
  
  		return (uc);
  	}
  
  	if (ntmp->ntm_82u != NULL)
  		return (ntmp->ntm_82u[wc&0xFF]);
  
  	return ('?');
  }
  