xnu-123.5.tar.gz

[apple/xnu.git] / bsd / isofs / cd9660 / cd9660_util.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*      $NetBSD: cd9660_util.c,v 1.8 1994/12/13 22:33:25 mycroft Exp $  */

/*-
 * Copyright (c) 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley
 * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
 * Support code is derived from software contributed to Berkeley
 * by Atsushi Murai (amurai@spec.co.jp).
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)cd9660_util.c       8.3 (Berkeley) 12/5/94
 *
 * HISTORY
 *  7-Dec-98    Add ATTR_VOL_MOUNTFLAGS attribute support - djb
 * 18-Nov-98    Add support for volfs - djb
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/utfconv.h>
#include <miscfs/specfs/specdev.h> /* XXX */
#include <miscfs/fifofs/fifo.h> /* XXX */
#include <sys/malloc.h>
#include <sys/dir.h>
#include <sys/attr.h>
#include <kern/assert.h>
#include <architecture/byte_order.h>

#include <isofs/cd9660/iso.h>
#include <isofs/cd9660/cd9660_node.h>
#include <isofs/cd9660/iso_rrip.h>

/*
 * translate and compare a filename
 * Note: Version number plus ';' may be omitted.
 */
int
isofncmp(fn, fnlen, isofn, isolen)
        u_char *fn, *isofn;
        int fnlen, isolen;
{
        int i, j;
        char c;
        
        while (--fnlen >= 0) {
                if (--isolen < 0)
                        return *fn;
                if ((c = *isofn++) == ';') {
                        switch (*fn++) {
                        default:
                                return *--fn;
                        case 0:
                                return 0;
                        case ';':
                                break;
                        }
                        for (i = 0; --fnlen >= 0; i = i * 10 + *fn++ - '0') {
                                if (*fn < '0' || *fn > '9') {
                                        return -1;
                                }
                        }
                        for (j = 0; --isolen >= 0; j = j * 10 + *isofn++ - '0');
                        return i - j;
                }
                /* if raw comparison fails, check if char was mapped */
                if (c != *fn) {
                        if (c >= 'A' && c <= 'Z') {
                                if (c + ('a' - 'A') != *fn) {
                                        if (*fn >= 'a' && *fn <= 'z')
                                                return *fn - ('a' - 'A') - c;
                                        else
                                                return *fn - c;
                                }
                        } else if (c == '/') {
                                if (*fn != ':')
                                        return *fn - c;
                        } else if (c > 0 || *fn != '_')
                                return *fn - c;
                }
                fn++;
        }
        if (isolen > 0) {
                switch (*isofn) {
                default:
                        return -1;
                case '.':
                        if (isofn[1] != ';')
                                return -1;
                case ';':
                        return 0;
                }
        }
        return 0;
}


/*
 * translate and compare a UCS-2 filename
 * Note: Version number plus ';' may be omitted.
 */

int
ucsfncmp(fn, fnlen, ucsfn, ucslen)
        u_int16_t *fn;
        int fnlen;
        u_int16_t *ucsfn;
        int ucslen;
{
        int i, j;
        u_int16_t c;
        
        /* convert byte count to char count */
        ucslen /= 2;
        fnlen /= 2;

        while (--fnlen >= 0) {
                if (--ucslen < 0)
                        return *fn;
                if ((c = *ucsfn++) == UCS_SEPARATOR2) {
                        switch (*fn++) {
                        default:
                                return *--fn;
                        case 0:
                                return 0;
                        case UCS_SEPARATOR2:
                                break;
                        }
                        for (i = 0; --fnlen >= 0; i = i * 10 + *fn++ - '0') {
                                if (*fn < '0' || *fn > '9') {
                                        return -1;
                                }
                        }
                        for (j = 0; --ucslen >= 0; j = j * 10 + *ucsfn++ - '0');
                        return i - j;
                }
                if (c != *fn)
                        return *fn - c;
                fn++;
        }
        if (ucslen > 0) {
                switch (*ucsfn) {
                default:
                        return -1;
                case UCS_SEPARATOR1:
                        if (ucsfn[1] != UCS_SEPARATOR2)
                                return -1;
                case UCS_SEPARATOR2:
                        return 0;
                }
        }
        return 0;
}


/*
 * translate a filename
 */
void
isofntrans(infn, infnlen, outfn, outfnlen, original)
        u_char *infn, *outfn;
        int infnlen;
        u_short *outfnlen;
        int original;
{
        int fnidx = 0;
        
        for (; fnidx < infnlen; fnidx++) {
                char c = *infn++;
                
                /*
                 * Some ISO 9600 CD names contain 8-bit chars.
                 * These chars are mapped to '_' because there
                 * is no context for mapping them to UTF-8.
                 * In addition '/' is mapped to ':'.
                 *
                 * isofncmp accounts for these mappings.
                 */
                if (!original) {
                        if (c < 0)
                                c = '_';
                        else if (c == '/')
                                c = ':';
                        else if (c == '.' && *infn == ';')
                                break;
                        else if (c == ';')
                                break;
                }
                *outfn++ = c;
        }
        *outfnlen = fnidx;
}



/*
 * translate a UCS-2 filename to UTF-8
 */
void
ucsfntrans(infn, infnlen, outfn, outfnlen, dir)
        u_int16_t *infn;
        int infnlen;
        u_char *outfn;
        u_short *outfnlen;
        int dir;
{
        if (infnlen == 1) {
                strcpy(outfn, "..");

                if (*(u_char*)infn == 0)
                        *outfnlen = 1;
                else if (*(u_char*)infn == 1) 
                        *outfnlen = 2;
        } else {
                int fnidx;
                size_t outbytes;
                int flags;
                
                fnidx = infnlen/2;
                flags = 0;

                if (!dir) {
                        /* strip file version number */
                        for (fnidx--; fnidx > 0; fnidx--) {
                                /* stop when ';' is found */
                                if (infn[fnidx] == UCS_SEPARATOR2) {
                                        /* drop dangling dot */
                                        if (fnidx > 0 && infn[fnidx-1] == UCS_SEPARATOR1)
                                                fnidx--;
                                        break;
                                }
                        }
                        if (fnidx <= 0)
                                fnidx = infnlen/2;
                }

                flags = UTF_NO_NULL_TERM;
                if (BYTE_ORDER != BIG_ENDIAN)
                        flags |= UTF_REVERSE_ENDIAN;

                (void) utf8_encodestr(infn, fnidx * 2, outfn, &outbytes, ISO_JOLIET_NAMEMAX, 0, flags);
                *outfnlen = outbytes;
        }
}


/*
 * count the number of children by enumerating the directory
 */
static int
isochildcount(vdp, dircnt, filcnt)
        struct vnode *vdp;
        int *dircnt;
        int *filcnt;
{
        struct iso_node *dp;
        struct buf *bp = NULL;
        struct iso_directory_record *ep;
        u_long bmask;
        int error = 0;
        int reclen;
        int dirs, files;
        int blkoffset;
        int logblksize;
        long diroffset;

        dp = VTOI(vdp);
        bmask = dp->i_mnt->im_bmask;
        logblksize = dp->i_mnt->logical_block_size;
        blkoffset = diroffset = 0;
        dirs = files = 0;

        while (diroffset < dp->i_size) {
                /*
                 * If offset is on a block boundary, read the next 
                 * directory block. Release previous if it exists.
                 */
                if ((diroffset & bmask) == 0) {
                        if (bp != NULL)
                                brelse(bp);
                        if ( (error = VOP_BLKATOFF(vdp, diroffset, NULL, &bp)) )
                                break;
                        blkoffset = 0;
                }

                ep = (struct iso_directory_record *)
                        ((char *)bp->b_data + blkoffset);

                reclen = isonum_711(ep->length);
                if (reclen == 0) {
                        /* skip to next block, if any */
                        diroffset =
                            (diroffset & ~bmask) + logblksize;
                        continue;
                }

                if ((reclen < ISO_DIRECTORY_RECORD_SIZE)  ||
                    (blkoffset + reclen > logblksize)     ||
                    (reclen < ISO_DIRECTORY_RECORD_SIZE + isonum_711(ep->name_len))){
                        /* illegal, so give up */
                        break;
                }

                if ( isonum_711(ep->flags) & directoryBit )
                        dirs++;
                else if ((isonum_711(ep->flags) & associatedBit) == 0)
                        files++;

                diroffset += reclen;
                blkoffset += reclen;
        }

        if (bp)
                brelse (bp);

        *dircnt = dirs;
        *filcnt = files;

        return (error);
}


/*
 * There are two ways to qualify for ownership rights on an object:
 *
 * 1. Your UID matches the UID of the vnode
 * 2. You are root
 *
 */
static int cd9660_owner_rights(uid_t owner, struct iso_mnt *imp, struct ucred *cred, struct proc *p, int invokesuperuserstatus) {
    return ((cred->cr_uid == owner) ||                                                                                                          /* [1] */
                (invokesuperuserstatus && (suser(cred, &p->p_acflag) == 0))) ? 0 : EPERM;                       /* [2] */
}



static unsigned long DerivePermissionSummary(uid_t owner, gid_t group, mode_t obj_mode, struct iso_mnt *imp, struct ucred *cred, struct proc *p) {
    register gid_t *gp;
    unsigned long permissions;
    int i;

     /* User id 0 (root) always gets access. */
     if (cred->cr_uid == 0) {
         permissions = R_OK | X_OK;
         goto Exit;
     };

    /* Otherwise, check the owner. */
    if (cd9660_owner_rights(owner, imp, cred, p, 0) == 0) {
        permissions = ((unsigned long)obj_mode & S_IRWXU) >> 6;
        goto Exit;
    }

    /* Otherwise, check the groups. */
    for (i = 0, gp = cred->cr_groups; i < cred->cr_ngroups; i++, gp++) {
        if (group == *gp) {
            permissions = ((unsigned long)obj_mode & S_IRWXG) >> 3;
                        goto Exit;
        }
    };

    /* Otherwise, settle for 'others' access. */
    permissions = (unsigned long)obj_mode & S_IRWXO;

Exit:
        return permissions & ~W_OK;     /* Write access is always impossible */
}


int
attrcalcsize(struct attrlist *attrlist)
{
        int size;
        attrgroup_t a;
        
#if ((ATTR_CMN_NAME                     | ATTR_CMN_DEVID                        | ATTR_CMN_FSID                         | ATTR_CMN_OBJTYPE              | \
      ATTR_CMN_OBJTAG           | ATTR_CMN_OBJID                        | ATTR_CMN_OBJPERMANENTID       | ATTR_CMN_PAROBJID             | \
      ATTR_CMN_SCRIPT           | ATTR_CMN_CRTIME                       | ATTR_CMN_MODTIME                      | ATTR_CMN_CHGTIME              | \
      ATTR_CMN_ACCTIME          | ATTR_CMN_BKUPTIME                     | ATTR_CMN_FNDRINFO                     | ATTR_CMN_OWNERID              | \
      ATTR_CMN_GRPID            | ATTR_CMN_ACCESSMASK           | ATTR_CMN_NAMEDATTRCOUNT       | ATTR_CMN_NAMEDATTRLIST| \
      ATTR_CMN_FLAGS            | ATTR_CMN_USERACCESS) != ATTR_CMN_VALIDMASK)
#error AttributeBlockSize: Missing bits in common mask computation!
#endif
        assert((attrlist->commonattr & ~ATTR_CMN_VALIDMASK) == 0);

#if ((ATTR_VOL_FSTYPE           | ATTR_VOL_SIGNATURE            | ATTR_VOL_SIZE                         | ATTR_VOL_SPACEFREE    | \
      ATTR_VOL_SPACEAVAIL       | ATTR_VOL_MINALLOCATION        | ATTR_VOL_ALLOCATIONCLUMP      | ATTR_VOL_IOBLOCKSIZE  | \
      ATTR_VOL_OBJCOUNT         | ATTR_VOL_FILECOUNT            | ATTR_VOL_DIRCOUNT                     | ATTR_VOL_MAXOBJCOUNT  | \
      ATTR_VOL_MOUNTPOINT       | ATTR_VOL_NAME                         | ATTR_VOL_MOUNTFLAGS           | ATTR_VOL_INFO                 | \
      ATTR_VOL_MOUNTEDDEVICE| ATTR_VOL_ENCODINGSUSED    | ATTR_VOL_CAPABILITIES         | ATTR_VOL_ATTRIBUTES) != ATTR_VOL_VALIDMASK)
#error AttributeBlockSize: Missing bits in volume mask computation!
#endif
        assert((attrlist->volattr & ~ATTR_VOL_VALIDMASK) == 0);

#if ((ATTR_DIR_LINKCOUNT | ATTR_DIR_ENTRYCOUNT | ATTR_DIR_MOUNTSTATUS) != ATTR_DIR_VALIDMASK)
#error AttributeBlockSize: Missing bits in directory mask computation!
#endif
        assert((attrlist->dirattr & ~ATTR_DIR_VALIDMASK) == 0);
#if ((ATTR_FILE_LINKCOUNT       | ATTR_FILE_TOTALSIZE           | ATTR_FILE_ALLOCSIZE           | ATTR_FILE_IOBLOCKSIZE         | \
      ATTR_FILE_CLUMPSIZE       | ATTR_FILE_DEVTYPE                     | ATTR_FILE_FILETYPE            | ATTR_FILE_FORKCOUNT           | \
      ATTR_FILE_FORKLIST        | ATTR_FILE_DATALENGTH          | ATTR_FILE_DATAALLOCSIZE       | ATTR_FILE_DATAEXTENTS         | \
      ATTR_FILE_RSRCLENGTH      | ATTR_FILE_RSRCALLOCSIZE       | ATTR_FILE_RSRCEXTENTS) != ATTR_FILE_VALIDMASK)
#error AttributeBlockSize: Missing bits in file mask computation!
#endif
        assert((attrlist->fileattr & ~ATTR_FILE_VALIDMASK) == 0);

#if ((ATTR_FORK_TOTALSIZE | ATTR_FORK_ALLOCSIZE) != ATTR_FORK_VALIDMASK)
#error AttributeBlockSize: Missing bits in fork mask computation!
#endif
        assert((attrlist->forkattr & ~ATTR_FORK_VALIDMASK) == 0);

        size = 0;
        
        if ((a = attrlist->commonattr) != 0) {
        if (a & ATTR_CMN_NAME) size += sizeof(struct attrreference);
                if (a & ATTR_CMN_DEVID) size += sizeof(dev_t);
                if (a & ATTR_CMN_FSID) size += sizeof(fsid_t);
                if (a & ATTR_CMN_OBJTYPE) size += sizeof(fsobj_type_t);
                if (a & ATTR_CMN_OBJTAG) size += sizeof(fsobj_tag_t);
                if (a & ATTR_CMN_OBJID) size += sizeof(fsobj_id_t);
        if (a & ATTR_CMN_OBJPERMANENTID) size += sizeof(fsobj_id_t);
                if (a & ATTR_CMN_PAROBJID) size += sizeof(fsobj_id_t);
                if (a & ATTR_CMN_SCRIPT) size += sizeof(text_encoding_t);
                if (a & ATTR_CMN_CRTIME) size += sizeof(struct timespec);
                if (a & ATTR_CMN_MODTIME) size += sizeof(struct timespec);
                if (a & ATTR_CMN_CHGTIME) size += sizeof(struct timespec);
                if (a & ATTR_CMN_ACCTIME) size += sizeof(struct timespec);
                if (a & ATTR_CMN_BKUPTIME) size += sizeof(struct timespec);
                if (a & ATTR_CMN_FNDRINFO) size += 32 * sizeof(u_int8_t);
                if (a & ATTR_CMN_OWNERID) size += sizeof(uid_t);
                if (a & ATTR_CMN_GRPID) size += sizeof(gid_t);
                if (a & ATTR_CMN_ACCESSMASK) size += sizeof(u_long);
                if (a & ATTR_CMN_NAMEDATTRCOUNT) size += sizeof(u_long);
                if (a & ATTR_CMN_NAMEDATTRLIST) size += sizeof(struct attrreference);
                if (a & ATTR_CMN_FLAGS) size += sizeof(u_long);
                if (a & ATTR_CMN_USERACCESS) size += sizeof(u_long);
        };
        if ((a = attrlist->volattr) != 0) {
                if (a & ATTR_VOL_FSTYPE) size += sizeof(u_long);
                if (a & ATTR_VOL_SIGNATURE) size += sizeof(u_long);
                if (a & ATTR_VOL_SIZE) size += sizeof(off_t);
                if (a & ATTR_VOL_SPACEFREE) size += sizeof(off_t);
                if (a & ATTR_VOL_SPACEAVAIL) size += sizeof(off_t);
                if (a & ATTR_VOL_MINALLOCATION) size += sizeof(off_t);
                if (a & ATTR_VOL_ALLOCATIONCLUMP) size += sizeof(off_t);
                if (a & ATTR_VOL_IOBLOCKSIZE) size += sizeof(size_t);
                if (a & ATTR_VOL_OBJCOUNT) size += sizeof(u_long);
                if (a & ATTR_VOL_FILECOUNT) size += sizeof(u_long);
                if (a & ATTR_VOL_DIRCOUNT) size += sizeof(u_long);
                if (a & ATTR_VOL_MAXOBJCOUNT) size += sizeof(u_long);
                if (a & ATTR_VOL_MOUNTPOINT) size += sizeof(struct attrreference);
        if (a & ATTR_VOL_NAME) size += sizeof(struct attrreference);
        if (a & ATTR_VOL_MOUNTFLAGS) size += sizeof(u_long);
        if (a & ATTR_VOL_MOUNTEDDEVICE) size += sizeof(struct attrreference);
        if (a & ATTR_VOL_ENCODINGSUSED) size += sizeof(unsigned long long);
        if (a & ATTR_VOL_CAPABILITIES) size += sizeof(vol_capabilities_attr_t);
        if (a & ATTR_VOL_ATTRIBUTES) size += sizeof(vol_attributes_attr_t);
        };
        if ((a = attrlist->dirattr) != 0) {
                if (a & ATTR_DIR_LINKCOUNT) size += sizeof(u_long);
                if (a & ATTR_DIR_ENTRYCOUNT) size += sizeof(u_long);
                if (a & ATTR_DIR_MOUNTSTATUS) size += sizeof(u_long);
        };
        if ((a = attrlist->fileattr) != 0) {
                if (a & ATTR_FILE_LINKCOUNT) size += sizeof(u_long);
                if (a & ATTR_FILE_TOTALSIZE) size += sizeof(off_t);
                if (a & ATTR_FILE_ALLOCSIZE) size += sizeof(off_t);
                if (a & ATTR_FILE_IOBLOCKSIZE) size += sizeof(size_t);
                if (a & ATTR_FILE_CLUMPSIZE) size += sizeof(off_t);
                if (a & ATTR_FILE_DEVTYPE) size += sizeof(u_long);
                if (a & ATTR_FILE_FILETYPE) size += sizeof(u_long);
                if (a & ATTR_FILE_FORKCOUNT) size += sizeof(u_long);
                if (a & ATTR_FILE_FORKLIST) size += sizeof(struct attrreference);
                if (a & ATTR_FILE_DATALENGTH) size += sizeof(off_t);
                if (a & ATTR_FILE_DATAALLOCSIZE) size += sizeof(off_t);
                if (a & ATTR_FILE_DATAEXTENTS) size += sizeof(extentrecord);
                if (a & ATTR_FILE_RSRCLENGTH) size += sizeof(off_t);
                if (a & ATTR_FILE_RSRCALLOCSIZE) size += sizeof(off_t);
                if (a & ATTR_FILE_RSRCEXTENTS) size += sizeof(extentrecord);
        };
        if ((a = attrlist->forkattr) != 0) {
                if (a & ATTR_FORK_TOTALSIZE) size += sizeof(off_t);
                if (a & ATTR_FORK_ALLOCSIZE) size += sizeof(off_t);
        };

    return size;
}



void
packvolattr (struct attrlist *alist,
                         struct iso_node *ip,   /* ip for root directory */
                         void **attrbufptrptr,
                         void **varbufptrptr)
{
    void *attrbufptr;
    void *varbufptr;
        struct iso_mnt *imp;
        struct mount *mp;
        attrgroup_t a;
        u_long attrlength;
        
        attrbufptr = *attrbufptrptr;
        varbufptr = *varbufptrptr;
        imp = ip->i_mnt;
        mp = imp->im_mountp;

    if ((a = alist->commonattr) != 0) {
        if (a & ATTR_CMN_NAME) {
            attrlength = strlen( imp->volume_id ) + 1;
            ((struct attrreference *)attrbufptr)->attr_dataoffset = (u_int8_t *)varbufptr - (u_int8_t *)attrbufptr;
            ((struct attrreference *)attrbufptr)->attr_length = attrlength;
            (void) strncpy((unsigned char *)varbufptr, imp->volume_id, attrlength);

            /* Advance beyond the space just allocated and round up to the next 4-byte boundary: */
            (u_int8_t *)varbufptr += attrlength + ((4 - (attrlength & 3)) & 3);
            ++((struct attrreference *)attrbufptr);
        };
                if (a & ATTR_CMN_DEVID) *((dev_t *)attrbufptr)++ = imp->im_devvp->v_rdev;
                if (a & ATTR_CMN_FSID) *((fsid_t *)attrbufptr)++ = ITOV(ip)->v_mount->mnt_stat.f_fsid;
                if (a & ATTR_CMN_OBJTYPE) *((fsobj_type_t *)attrbufptr)++ = 0;
                if (a & ATTR_CMN_OBJTAG) *((fsobj_tag_t *)attrbufptr)++ = VT_ISOFS;
                if (a & ATTR_CMN_OBJID) {
                        ((fsobj_id_t *)attrbufptr)->fid_objno = 0;
                        ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                        ++((fsobj_id_t *)attrbufptr);
                };
        if (a & ATTR_CMN_OBJPERMANENTID) {
            ((fsobj_id_t *)attrbufptr)->fid_objno = 0;
            ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
            ++((fsobj_id_t *)attrbufptr);
        };
                if (a & ATTR_CMN_PAROBJID) {
            ((fsobj_id_t *)attrbufptr)->fid_objno = 0;
                        ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                        ++((fsobj_id_t *)attrbufptr);
                };
        if (a & ATTR_CMN_SCRIPT) *((text_encoding_t *)attrbufptr)++ = 0;
                if (a & ATTR_CMN_CRTIME) *((struct timespec *)attrbufptr)++ = imp->creation_date;
                if (a & ATTR_CMN_MODTIME) *((struct timespec *)attrbufptr)++ = imp->modification_date;
                if (a & ATTR_CMN_CHGTIME) *((struct timespec *)attrbufptr)++ = imp->modification_date;
                if (a & ATTR_CMN_ACCTIME) *((struct timespec *)attrbufptr)++ = imp->modification_date;
                if (a & ATTR_CMN_BKUPTIME) {
                        ((struct timespec *)attrbufptr)->tv_sec = 0;
                        ((struct timespec *)attrbufptr)->tv_nsec = 0;
                        ++((struct timespec *)attrbufptr);
                };
                if (a & ATTR_CMN_FNDRINFO) {
            bzero (attrbufptr, 32 * sizeof(u_int8_t));
            (u_int8_t *)attrbufptr += 32 * sizeof(u_int8_t);
                };
                if (a & ATTR_CMN_OWNERID) *((uid_t *)attrbufptr)++ = ip->inode.iso_uid;
                if (a & ATTR_CMN_GRPID) *((gid_t *)attrbufptr)++ = ip->inode.iso_gid;
                if (a & ATTR_CMN_ACCESSMASK) *((u_long *)attrbufptr)++ = (u_long)ip->inode.iso_mode;
                if (a & ATTR_CMN_FLAGS) *((u_long *)attrbufptr)++ = 0;
                if (a & ATTR_CMN_USERACCESS) {
                        *((u_long *)attrbufptr)++ =
                                DerivePermissionSummary(ip->inode.iso_uid,
                                                                                ip->inode.iso_gid,
                                                                                ip->inode.iso_mode,
                                                                                imp,
                                                                                current_proc()->p_ucred,
                                                                                current_proc());
                };
        };
        
        if ((a = alist->volattr) != 0) {
                off_t blocksize = (off_t)imp->logical_block_size;

                if (a & ATTR_VOL_FSTYPE) *((u_long *)attrbufptr)++ = (u_long)imp->im_mountp->mnt_vfc->vfc_typenum;
                if (a & ATTR_VOL_SIGNATURE) *((u_long *)attrbufptr)++ = (u_long)ISO9660SIGNATURE;
        if (a & ATTR_VOL_SIZE) *((off_t *)attrbufptr)++ = (off_t)imp->volume_space_size * blocksize;
        if (a & ATTR_VOL_SPACEFREE) *((off_t *)attrbufptr)++ = 0;
        if (a & ATTR_VOL_SPACEAVAIL) *((off_t *)attrbufptr)++ = 0;
        if (a & ATTR_VOL_MINALLOCATION) *((off_t *)attrbufptr)++ = blocksize;
                if (a & ATTR_VOL_ALLOCATIONCLUMP) *((off_t *)attrbufptr)++ = blocksize;
        if (a & ATTR_VOL_IOBLOCKSIZE) *((size_t *)attrbufptr)++ = blocksize;
                if (a & ATTR_VOL_OBJCOUNT) *((u_long *)attrbufptr)++ = 0;
                if (a & ATTR_VOL_FILECOUNT) *((u_long *)attrbufptr)++ = 0;
                if (a & ATTR_VOL_DIRCOUNT) *((u_long *)attrbufptr)++ = 0;
                if (a & ATTR_VOL_MAXOBJCOUNT) *((u_long *)attrbufptr)++ = 0xFFFFFFFF;
        if (a & ATTR_VOL_NAME) {
            attrlength = strlen( imp->volume_id ) + 1;
            ((struct attrreference *)attrbufptr)->attr_dataoffset = (u_int8_t *)varbufptr - (u_int8_t *)attrbufptr;
            ((struct attrreference *)attrbufptr)->attr_length = attrlength;
            (void) strncpy((unsigned char *)varbufptr, imp->volume_id, attrlength);

            /* Advance beyond the space just allocated and round up to the next 4-byte boundary: */
            (u_int8_t *)varbufptr += attrlength + ((4 - (attrlength & 3)) & 3);
            ++((struct attrreference *)attrbufptr);
        };
                if (a & ATTR_VOL_MOUNTFLAGS) *((u_long *)attrbufptr)++ = (u_long)imp->im_mountp->mnt_flag;
        if (a & ATTR_VOL_MOUNTEDDEVICE) {
            ((struct attrreference *)attrbufptr)->attr_dataoffset = (u_int8_t *)varbufptr - (u_int8_t *)attrbufptr;
            ((struct attrreference *)attrbufptr)->attr_length = strlen(mp->mnt_stat.f_mntfromname) + 1;
                        attrlength = ((struct attrreference *)attrbufptr)->attr_length;
                        attrlength = attrlength + ((4 - (attrlength & 3)) & 3);         /* round up to the next 4-byte boundary: */
                        (void) bcopy(mp->mnt_stat.f_mntfromname, varbufptr, attrlength);
                        
                        /* Advance beyond the space just allocated: */
            (u_int8_t *)varbufptr += attrlength;
            ++((struct attrreference *)attrbufptr);
        };
        if (a & ATTR_VOL_ENCODINGSUSED) *((unsigned long long *)attrbufptr)++ = (unsigned long long)0;
        if (a & ATTR_VOL_CAPABILITIES) {
                ((vol_capabilities_attr_t *)attrbufptr)->capabilities[VOL_CAPABILITIES_FORMAT] = VOL_CAP_FMT_PERSISTENTOBJECTIDS;
                ((vol_capabilities_attr_t *)attrbufptr)->capabilities[VOL_CAPABILITIES_INTERFACES] =
                                VOL_CAP_INT_ATTRLIST | VOL_CAP_INT_NFSEXPORT;
                ((vol_capabilities_attr_t *)attrbufptr)->capabilities[VOL_CAPABILITIES_RESERVED1] = 0;
                ((vol_capabilities_attr_t *)attrbufptr)->capabilities[VOL_CAPABILITIES_RESERVED2] = 0;

                ((vol_capabilities_attr_t *)attrbufptr)->valid[VOL_CAPABILITIES_FORMAT] =
                                VOL_CAP_FMT_PERSISTENTOBJECTIDS | VOL_CAP_FMT_SYMBOLICLINKS | VOL_CAP_FMT_HARDLINKS;
                ((vol_capabilities_attr_t *)attrbufptr)->valid[VOL_CAPABILITIES_INTERFACES] =
                                VOL_CAP_INT_SEARCHFS | VOL_CAP_INT_ATTRLIST | VOL_CAP_INT_NFSEXPORT;
                ((vol_capabilities_attr_t *)attrbufptr)->valid[VOL_CAPABILITIES_RESERVED1] = 0;
                ((vol_capabilities_attr_t *)attrbufptr)->valid[VOL_CAPABILITIES_RESERVED2] = 0;

            ++((vol_capabilities_attr_t *)attrbufptr);
        };
        if (a & ATTR_VOL_ATTRIBUTES) {
                ((vol_attributes_attr_t *)attrbufptr)->validattr.commonattr = ATTR_CMN_VALIDMASK;
                ((vol_attributes_attr_t *)attrbufptr)->validattr.volattr = ATTR_VOL_VALIDMASK;
                ((vol_attributes_attr_t *)attrbufptr)->validattr.dirattr = ATTR_DIR_VALIDMASK;
                ((vol_attributes_attr_t *)attrbufptr)->validattr.fileattr = ATTR_FILE_VALIDMASK;
                ((vol_attributes_attr_t *)attrbufptr)->validattr.forkattr = ATTR_FORK_VALIDMASK;

                ((vol_attributes_attr_t *)attrbufptr)->nativeattr.commonattr = ATTR_CMN_VALIDMASK;
                ((vol_attributes_attr_t *)attrbufptr)->nativeattr.volattr = ATTR_VOL_VALIDMASK;
                ((vol_attributes_attr_t *)attrbufptr)->nativeattr.dirattr = ATTR_DIR_VALIDMASK;
                ((vol_attributes_attr_t *)attrbufptr)->nativeattr.fileattr = ATTR_FILE_VALIDMASK;
                ((vol_attributes_attr_t *)attrbufptr)->nativeattr.forkattr = ATTR_FORK_VALIDMASK;

            ++((vol_attributes_attr_t *)attrbufptr);
        };
        };

        *attrbufptrptr = attrbufptr;
        *varbufptrptr = varbufptr;
}


void
packcommonattr (struct attrlist *alist,
                                struct iso_node *ip,
                                void **attrbufptrptr,
                                void **varbufptrptr)
{
        void *attrbufptr;
        void *varbufptr;
        attrgroup_t a;
        u_long attrlength;
        
        attrbufptr = *attrbufptrptr;
        varbufptr = *varbufptrptr;
        
    if ((a = alist->commonattr) != 0) {
                struct iso_mnt *imp = ip->i_mnt;

        if (a & ATTR_CMN_NAME) {
                        /* special case root since we know how to get it's name */
                        if (ITOV(ip)->v_flag & VROOT) {
                                attrlength = strlen( imp->volume_id ) + 1;
                                (void) strncpy((unsigned char *)varbufptr, imp->volume_id, attrlength);
                } else {
                attrlength = strlen(ip->i_namep) + 1;
                                (void) strncpy((unsigned char *)varbufptr, ip->i_namep, attrlength);
            }

                        ((struct attrreference *)attrbufptr)->attr_dataoffset = (u_int8_t *)varbufptr - (u_int8_t *)attrbufptr;
                        ((struct attrreference *)attrbufptr)->attr_length = attrlength;
            /* Advance beyond the space just allocated and round up to the next 4-byte boundary: */
            (u_int8_t *)varbufptr += attrlength + ((4 - (attrlength & 3)) & 3);
            ++((struct attrreference *)attrbufptr);
        };
                if (a & ATTR_CMN_DEVID) *((dev_t *)attrbufptr)++ = ip->i_dev;
                if (a & ATTR_CMN_FSID) *((fsid_t *)attrbufptr)++ = ITOV(ip)->v_mount->mnt_stat.f_fsid;
                if (a & ATTR_CMN_OBJTYPE) *((fsobj_type_t *)attrbufptr)++ = ITOV(ip)->v_type;
                if (a & ATTR_CMN_OBJTAG) *((fsobj_tag_t *)attrbufptr)++ = ITOV(ip)->v_tag;
        if (a & ATTR_CMN_OBJID) {
                        if (ITOV(ip)->v_flag & VROOT)
                                ((fsobj_id_t *)attrbufptr)->fid_objno = 2;      /* force root to be 2 */
                        else
                ((fsobj_id_t *)attrbufptr)->fid_objno = ip->i_number;
                        ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                        ++((fsobj_id_t *)attrbufptr);
                };
        if (a & ATTR_CMN_OBJPERMANENTID)        {
                        if (ITOV(ip)->v_flag & VROOT)
                                ((fsobj_id_t *)attrbufptr)->fid_objno = 2;      /* force root to be 2 */
                        else
                ((fsobj_id_t *)attrbufptr)->fid_objno = ip->i_number;
            ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
            ++((fsobj_id_t *)attrbufptr);
        };
                if (a & ATTR_CMN_PAROBJID) {
                        struct iso_directory_record *dp = (struct iso_directory_record *)imp->root;
                        ino_t rootino = isodirino(dp, imp);

                        if (ip->i_number == rootino)
                                ((fsobj_id_t *)attrbufptr)->fid_objno = 1;      /* force root parent to be 1 */
                        else if (ip->i_parent == rootino)
                                ((fsobj_id_t *)attrbufptr)->fid_objno = 2;      /* force root to be 2 */
                        else
                ((fsobj_id_t *)attrbufptr)->fid_objno = ip->i_parent;
                        ((fsobj_id_t *)attrbufptr)->fid_generation = 0;
                        ++((fsobj_id_t *)attrbufptr);
                };
        if (a & ATTR_CMN_SCRIPT) *((text_encoding_t *)attrbufptr)++ = 0;
                if (a & ATTR_CMN_CRTIME) *((struct timespec *)attrbufptr)++ = ip->inode.iso_mtime;
                if (a & ATTR_CMN_MODTIME) *((struct timespec *)attrbufptr)++ = ip->inode.iso_mtime;
                if (a & ATTR_CMN_CHGTIME) *((struct timespec *)attrbufptr)++ = ip->inode.iso_ctime;
                if (a & ATTR_CMN_ACCTIME) *((struct timespec *)attrbufptr)++ = ip->inode.iso_atime;
                if (a & ATTR_CMN_BKUPTIME) {
                        ((struct timespec *)attrbufptr)->tv_sec = 0;
                        ((struct timespec *)attrbufptr)->tv_nsec = 0;
                        ++((struct timespec *)attrbufptr);
                };
                if (a & ATTR_CMN_FNDRINFO) {
                        struct finder_info finfo = {0};

                        finfo.fdFlags = ip->i_FinderFlags;
                        if (ITOV(ip)->v_type == VREG) {
                                finfo.fdType = ip->i_FileType;
                                finfo.fdCreator = ip->i_Creator;
                        }
            bcopy (&finfo, attrbufptr, sizeof(finfo));
            (u_int8_t *)attrbufptr += sizeof(finfo);
            bzero (attrbufptr, EXTFNDRINFOSIZE);
            (u_int8_t *)attrbufptr += EXTFNDRINFOSIZE;
                };
                if (a & ATTR_CMN_OWNERID) *((uid_t *)attrbufptr)++ = ip->inode.iso_uid;
                if (a & ATTR_CMN_GRPID) *((gid_t *)attrbufptr)++ = ip->inode.iso_gid;
                if (a & ATTR_CMN_ACCESSMASK) *((u_long *)attrbufptr)++ = (u_long)ip->inode.iso_mode;
                if (a & ATTR_CMN_FLAGS) *((u_long *)attrbufptr)++ = 0; /* could also use ip->i_flag */
                if (a & ATTR_CMN_USERACCESS) {
                        *((u_long *)attrbufptr)++ =
                                DerivePermissionSummary(ip->inode.iso_uid,
                                                                                ip->inode.iso_gid,
                                                                                ip->inode.iso_mode,
                                                                                imp,
                                                                                current_proc()->p_ucred,
                                                                                current_proc());
                };
        };
        
        *attrbufptrptr = attrbufptr;
        *varbufptrptr = varbufptr;
}


void
packdirattr(struct attrlist *alist,
                        struct iso_node *ip,
                        void **attrbufptrptr,
                        void **varbufptrptr)
{
    void *attrbufptr;
    attrgroup_t a;
        int filcnt, dircnt;
        
        attrbufptr = *attrbufptrptr;
        filcnt = dircnt = 0;
        
        a = alist->dirattr;
        if ((ITOV(ip)->v_type == VDIR) && (a != 0)) {
                /*
                 * if we haven't counted our children yet, do it now...
                 */
                if ((ip->i_entries == 0) &&
                    (a & (ATTR_DIR_LINKCOUNT | ATTR_DIR_ENTRYCOUNT))) {
                        (void) isochildcount(ITOV(ip), &dircnt, &filcnt);

                        if ((ip->inode.iso_links == 1) && (dircnt != 0))
                                ip->inode.iso_links = dircnt;
                        if ((filcnt + dircnt) > 0)
                                ip->i_entries = dircnt + filcnt;
                }

                if (a & ATTR_DIR_LINKCOUNT) {
                        *((u_long *)attrbufptr)++ = ip->inode.iso_links;
                }
                if (a & ATTR_DIR_ENTRYCOUNT) {
                        /* exclude '.' and '..' from total caount */
                        *((u_long *)attrbufptr)++ = ((ip->i_entries <= 2) ? 0 : (ip->i_entries - 2));
                }
                if (a & ATTR_DIR_MOUNTSTATUS) {
                        if (ITOV(ip)->v_mountedhere) {
                                *((u_long *)attrbufptr)++ = DIR_MNTSTATUS_MNTPOINT;
                        } else {
                                *((u_long *)attrbufptr)++ = 0;
                        };
                };
        };
        
        *attrbufptrptr = attrbufptr;
}


void
packfileattr(struct attrlist *alist,
                         struct iso_node *ip,
                         void **attrbufptrptr,
                         void **varbufptrptr)
{
    void *attrbufptr = *attrbufptrptr;
    void *varbufptr = *varbufptrptr;
    attrgroup_t a = alist->fileattr;
        
        if ((ITOV(ip)->v_type == VREG) && (a != 0)) {
                if (a & ATTR_FILE_LINKCOUNT)
                        *((u_long *)attrbufptr)++ = ip->inode.iso_links;
                if (a & ATTR_FILE_TOTALSIZE)
                        *((off_t *)attrbufptr)++ = (off_t)ip->i_size;
                if (a & ATTR_FILE_ALLOCSIZE)
                        *((off_t *)attrbufptr)++ = (off_t)ip->i_size;
                if (a & ATTR_FILE_IOBLOCKSIZE)
                        *((u_long *)attrbufptr)++ = ip->i_mnt->logical_block_size;
                if (a & ATTR_FILE_CLUMPSIZE)
                        *((u_long *)attrbufptr)++ = ip->i_mnt->logical_block_size;
                if (a & ATTR_FILE_DEVTYPE)
                        *((u_long *)attrbufptr)++ = (u_long)ip->inode.iso_rdev;
                if (a & ATTR_FILE_DATALENGTH)
                        *((off_t *)attrbufptr)++ = (off_t)ip->i_size;
                if (a & ATTR_FILE_DATAALLOCSIZE)
                        *((off_t *)attrbufptr)++ = (off_t)ip->i_size;
                if (a & ATTR_FILE_RSRCLENGTH)
                        *((off_t *)attrbufptr)++ = (off_t)ip->i_rsrcsize;
                if (a & ATTR_FILE_RSRCALLOCSIZE)
                        *((off_t *)attrbufptr)++ = (off_t)ip->i_rsrcsize;
        }
        
        *attrbufptrptr = attrbufptr;
        *varbufptrptr = varbufptr;
}


void
packattrblk(struct attrlist *alist,
                        struct vnode *vp,
                        void **attrbufptrptr,
                        void **varbufptrptr)
{
        struct iso_node *ip = VTOI(vp);

        if (alist->volattr != 0) {
                packvolattr(alist, ip, attrbufptrptr, varbufptrptr);
        } else {
                packcommonattr(alist, ip, attrbufptrptr, varbufptrptr);
                
                switch (ITOV(ip)->v_type) {
                  case VDIR:
                        packdirattr(alist, ip, attrbufptrptr, varbufptrptr);
                        break;
                        
                  case VREG:
                        packfileattr(alist, ip, attrbufptrptr, varbufptrptr);
                        break;
                  
                  /* Without this the compiler complains about VNON,VBLK,VCHR,VLNK,VSOCK,VFIFO,VBAD and VSTR
                     not being handled...
                   */
                  default:
                        break;
                };
        };
};