/*      $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/uio.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>

#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"

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");

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 %ju\n", (uintmax_t)ino));

        do {
                if ((ip = ntfs_nthashlookup(ntmp->ntm_dev, ino)) != NULL) {
                        ntfs_ntget(ip);
                        dprintf(("ntfs_ntlookup: ntnode %ju: %p, usecount: %d\n",
                                (uintmax_t)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: %ju: %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, 0);
        spin_init(&ip->i_interlock, "ntfsntlookup");
        ntfs_ntget(ip);

        ntfs_nthashins(ip);

        LOCKMGR(&ntfs_hashlock, LK_RELEASE);

        *ipp = ip;

        dprintf(("ntfs_ntlookup: ntnode %ju: %p, usecount: %d\n",
                (uintmax_t)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 ",
                      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");
        }

        /*
         * 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 ",
                      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;

        len = 0;        /* avoid gcc warnings */
        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, 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", 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) {
                        /*
                         * Always read and write single clusters at a time -
                         * we need to avoid requesting differently-sized
                         * blocks at the same disk offsets to avoid
                         * confusing the buffer cache.
                         */
                        tocopy = min(left, ntfs_cntob(1) - off);
                        cl = ntfs_btocl(tocopy + off);
                        KASSERT(cl == 1 && tocopy <= ntfs_cntob(1),
                            ("single cluster limit mistake"));
                        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)
                                uiomovebp(bp, 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) {
                                        tocopy = min(left,
                                                  min(ntfs_cntob(ccl) - off,
                                                      MAXBSIZE - off));
                                        cl = ntfs_btocl(tocopy + off);

                                        /*
                                         * Always read single clusters at a
                                         * time - we need to avoid reading
                                         * differently-sized blocks at the
                                         * same disk offsets to avoid
                                         * confusing the buffer cache.
                                         */
                                        tocopy = min(left,
                                            ntfs_cntob(1) - off);
                                        cl = ntfs_btocl(tocopy + off);
                                        KASSERT(cl == 1 &&
                                            tocopy <= ntfs_cntob(1),
                                            ("single cluster limit mistake"));

                                        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) {
                                                uiomovebp(bp, 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 = rounddown2(ntfs_btocn(roff), NTFS_COMPUNIT_CL);
                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;

#ifdef 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",
                        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 **)(void *)&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 **)(void *)&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 ('?');
}