BasiliskII/src/extfs.cpp

/*
 *  extfs.cpp - MacOS file system for native file system access
 *
 *  Basilisk II (C) 1997-2008 Christian Bauer
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/*
 *  SEE ALSO
 *    Guide to the File System Manager (from FSM 1.2 SDK)
 *
 *  TODO
 *    LockRng
 *    UnlockRng
 *    (CatSearch)
 *    (MakeFSSpec)
 *    (GetVolMountInfoSize)
 *    (GetVolMountInfo)
 *    (GetForeignPrivs)
 *    (SetForeignPrivs)
 */

#include "sysdeps.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>

#ifndef WIN32
#include <unistd.h>
#include <dirent.h>
#endif

#if defined __APPLE__ && defined __MACH__
#include <sys/attr.h>
#endif

#include "cpu_emulation.h"
#include "emul_op.h"
#include "main.h"
#include "disk.h"
#include "prefs.h"
#include "user_strings.h"
#include "extfs.h"
#include "extfs_defs.h"

#ifdef WIN32
# include "posix_emu.h"
#endif

#define DEBUG 0
#include "debug.h"


// File system global data and 68k routines
enum {
        fsCommProcStub = 0,
        fsHFSProcStub = 6,
        fsDrvStatus = 12,                               // Drive Status record
        fsFSD = 42,                                             // File system descriptor
        fsPB = 238,                                             // IOParam (for mounting and renaming), also used for temporary storage
        fsVMI = 288,                                    // VoumeMountInfoHeader (for mounting)
        fsParseRec = 296,                               // ParsePathRec struct
        fsReturn = 306,                                 // Area for return data of 68k routines
        fsAllocateVCB = 562,                    // UTAllocateVCB(uint16 *sysVCBLength{a0}, uint32 *vcb{a1})
        fsAddNewVCB = 578,                              // UTAddNewVCB(int drive_number{d0}, int16 *vRefNum{a1}, uint32 vcb{a1})
        fsDetermineVol = 594,                   // UTDetermineVol(uint32 pb{a0}, int16 *status{a1}, int16 *more_matches{a2}, int16 *vRefNum{a3}, uint32 *vcb{a4})
        fsResolveWDCB = 614,                    // UTResolveWDCB(uint32 procID{d0}, int16 index{d1}, int16 vRefNum{d0}, uint32 *wdcb{a0})
        fsGetDefaultVol = 632,                  // UTGetDefaultVol(uint32 wdpb{a0})
        fsGetPathComponentName = 644,   // UTGetPathComponentName(uint32 rec{a0})
        fsParsePathname = 656,                  // UTParsePathname(uint32 *start{a0}, uint32 name{a1})
        fsDisposeVCB = 670,                             // UTDisposeVCB(uint32 vcb{a0})
        fsCheckWDRefNum = 682,                  // UTCheckWDRefNum(int16 refNum{d0})
        fsSetDefaultVol = 694,                  // UTSetDefaultVol(uint32 dummy{d0}, int32 dirID{d1}, int16 refNum{d2})
        fsAllocateFCB = 710,                    // UTAllocateFCB(int16 *refNum{a0}, uint32 *fcb{a1})
        fsReleaseFCB = 724,                             // UTReleaseFCB(int16 refNum{d0})
        fsIndexFCB = 736,                               // UTIndexFCB(uint32 vcb{a0}, int16 *refNum{a1}, uint32 *fcb{a2})
        fsResolveFCB = 752,                             // UTResolveFCB(int16 refNum{d0}, uint32 *fcb{a0})
        fsAdjustEOF = 766,                              // UTAdjustEOF(int16 refNum{d0})
        fsAllocateWDCB = 778,                   // UTAllocateWDCB(uint32 pb{a0})
        fsReleaseWDCB = 790,                    // UTReleaseWDCB(int16 vRefNum{d0})
        SIZEOF_fsdat = 802
};

static uint32 fs_data = 0;              // Mac address of global data


// File system and volume name
static char FS_NAME[32], VOLUME_NAME[32];

// This directory is our root (read from prefs)
static const char *RootPath;
static bool ready = false;
static struct stat root_stat;

// File system ID/media type
const int16 MY_FSID = EMULATOR_ID_2;
const uint32 MY_MEDIA_TYPE = EMULATOR_ID_4;

// CNID of root and root's parent
const uint32 ROOT_ID = 2;
const uint32 ROOT_PARENT_ID = 1;

// File system stack size
const int STACK_SIZE = 0x10000;

// Allocation block and clump size as reported to MacOS (these are of course
// not the real values and have no meaning on the host OS)
const int AL_BLK_SIZE = 0x4000;
const int CLUMP_SIZE = 0x4000;

// Drive number of our pseudo-drive
static int drive_number;


// Disk/drive icon
const uint8 ExtFSIcon[256] = {
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfe,
        0x80, 0x00, 0x00, 0x91, 0x80, 0x00, 0x00, 0x91, 0x80, 0x00, 0x01, 0x21, 0x80, 0x00, 0x01, 0x21,
        0x80, 0x00, 0x02, 0x41, 0x8c, 0x00, 0x02, 0x41, 0x80, 0x00, 0x04, 0x81, 0x80, 0x00, 0x04, 0x81,
        0x7f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7f, 0xff, 0xff, 0xfe,
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
        0x7f, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};


// These objects are used to map CNIDs to path names
struct FSItem {
        FSItem *next;                   // Pointer to next FSItem in list
        uint32 id;                              // CNID of this file/dir
        uint32 parent_id;               // CNID of parent file/dir
        FSItem *parent;                 // Pointer to parent
        char *name;                             // Object name (C string) - Host OS
        char guest_name[32];    // Object name (C string) - Guest OS
        time_t mtime;                   // Modification time for get_cat_info caching
        int cache_dircount;             // Cached number of files in directory
};

static FSItem *first_fs_item, *last_fs_item;

static uint32 next_cnid = fsUsrCNID;    // Next available CNID


/*
 *  Get object creation time
 */

#if defined __APPLE__ && defined __MACH__
struct crtimebuf {
        unsigned long length;
        struct timespec crtime;
};

static uint32 do_get_creation_time(const char *path)
{
        struct attrlist attr;
        memset(&attr, 0, sizeof(attr));
        attr.bitmapcount = ATTR_BIT_MAP_COUNT;
        attr.commonattr = ATTR_CMN_CRTIME;

        crtimebuf buf;
        if (getattrlist(path, &attr, &buf, sizeof(buf), FSOPT_NOFOLLOW) < 0)
                return 0;
        return TimeToMacTime(buf.crtime.tv_sec);
}

static uint32 get_creation_time(const char *path)
{
        if (path == NULL)
                return 0;
        if (path == RootPath) {
                static uint32 root_crtime = UINT_MAX;
                if (root_crtime == UINT_MAX)
                        root_crtime = do_get_creation_time(path);
                return root_crtime;
        }
        return do_get_creation_time(path);
}
#endif


/*
 *  Find FSItem for given CNID
 */

static FSItem *find_fsitem_by_id(uint32 cnid)
{
        FSItem *p = first_fs_item;
        while (p) {
                if (p->id == cnid)
                        return p;
                p = p->next;
        }
        return NULL;
}

/*
 *  Create FSItem with the given parameters
 */

static FSItem *create_fsitem(const char *name, const char *guest_name, FSItem *parent)
{
        FSItem *p = new FSItem;
        last_fs_item->next = p;
        p->next = NULL;
        last_fs_item = p;
        p->id = next_cnid++;
        p->parent_id = parent->id;
        p->parent = parent;
        p->name = new char[strlen(name) + 1];
        strcpy(p->name, name);
        strncpy(p->guest_name, guest_name, 31);
        p->guest_name[31] = 0;
        p->mtime = 0;
        return p;
}

/*
 *  Find FSItem for given name and parent, construct new FSItem if not found
 */

static FSItem *find_fsitem(const char *name, FSItem *parent)
{
        FSItem *p = first_fs_item;
        while (p) {
                if (p->parent == parent && !strcmp(p->name, name))
                        return p;
                p = p->next;
        }

        // Not found, construct new FSItem
        return create_fsitem(name, host_encoding_to_macroman(name), parent);
}

/*
 *  Find FSItem for given guest_name and parent, construct new FSItem if not found
 */

static FSItem *find_fsitem_guest(const char *guest_name, FSItem *parent)
{
        FSItem *p = first_fs_item;
        while (p) {
                if (p->parent == parent && !strcmp(p->guest_name, guest_name))
                        return p;
                p = p->next;
        }

        // Not found, construct new FSItem
        return create_fsitem(macroman_to_host_encoding(guest_name), guest_name, parent);
}

/*
 *  Get full path (->full_path) for given FSItem
 */

static char full_path[MAX_PATH_LENGTH];

static void add_path_comp(const char *s)
{
        add_path_component(full_path, s);
}

static void get_path_for_fsitem(FSItem *p)
{
        if (p->id == ROOT_PARENT_ID) {
                full_path[0] = 0;
        } else if (p->id == ROOT_ID) {
                strncpy(full_path, RootPath, MAX_PATH_LENGTH-1);
                full_path[MAX_PATH_LENGTH-1] = 0;
        } else {
                get_path_for_fsitem(p->parent);
                add_path_comp(p->name);
        }
}


/*
 *  Exchange parent CNIDs in all FSItems
 */

static void swap_parent_ids(uint32 parent1, uint32 parent2)
{
        FSItem *p = first_fs_item;
        while (p) {
                if (p->parent_id == parent1)
                        p->parent_id = parent2;
                else if (p->parent_id == parent2)
                        p->parent_id = parent1;
                p = p->next;
        }
}


/*
 *  String handling functions
 */

// Copy pascal string
static void pstrcpy(char *dst, const char *src)
{
        int size = *dst++ = *src++;
        while (size--)
                *dst++ = *src++;
}

// Convert C string to pascal string
static void cstr2pstr(char *dst, const char *src)
{
        *dst++ = strlen(src);
        char c;
        while ((c = *src++) != 0) {
                // Note: we are converting host ':' characters to Mac '/' characters here
                // '/' is not a path separator as this function is only used on object names
                if (c == ':')
                        c = '/';
                *dst++ = c;
        }
}

// Convert string (no length byte) to C string, length given separately
static void strn2cstr(char *dst, const char *src, int size)
{
        while (size--) {
                char c = *src++;
                // Note: we are converting Mac '/' characters to host ':' characters here
                // '/' is not a path separator as this function is only used on object names
                if (c == '/')
                        c = ':';
                *dst++ = c;
        }
        *dst = 0;
}


/*
 *  Convert errno to MacOS error code
 */

static int16 errno2oserr(void)
{
        D(bug(" errno %08x\n", errno));
        switch (errno) {
                case 0:
                        return noErr;
                case ENOENT:
                case EISDIR:
                        return fnfErr;
                case EACCES:
                case EPERM:
                        return permErr;
                case EEXIST:
                        return dupFNErr;
                case EBUSY:
                case ENOTEMPTY:
                        return fBsyErr;
                case ENOSPC:
                        return dskFulErr;
                case EROFS:
                        return wPrErr;
                case EMFILE:
                        return tmfoErr;
                case ENOMEM:
                        return -108;
                case EIO:
                default:
                        return ioErr;
        }
}


/*
 *  Initialization
 */

void ExtFSInit(void)
{
        // System specific initialization
        extfs_init();

        // Get file system and volume name
        cstr2pstr(FS_NAME, GetString(STR_EXTFS_NAME));
        cstr2pstr(VOLUME_NAME, GetString(STR_EXTFS_VOLUME_NAME));

        // Create root's parent FSItem
        FSItem *p = new FSItem;
        first_fs_item = last_fs_item = p;
        p->next = NULL;
        p->id = ROOT_PARENT_ID;
        p->parent_id = 0;
        p->parent = NULL;
        p->name = new char[1];
        p->name[0] = 0;
        p->guest_name[0] = 0;

        // Create root FSItem
        p = new FSItem;
        last_fs_item->next = p;
        p->next = NULL;
        last_fs_item = p;
        p->id = ROOT_ID;
        p->parent_id = ROOT_PARENT_ID;
        p->parent = first_fs_item;
        const char *volume_name = GetString(STR_EXTFS_VOLUME_NAME);
        p->name = new char[strlen(volume_name) + 1];
        strcpy(p->name, volume_name);
        strncpy(p->guest_name, host_encoding_to_macroman(p->name), 32);
        p->guest_name[31] = 0;

        // Find path for root
        if ((RootPath = PrefsFindString("extfs")) != NULL) {
                if (stat(RootPath, &root_stat))
                        return;
                if (!S_ISDIR(root_stat.st_mode))
                        return;
                ready = true;
        }
}


/*
 *  Deinitialization
 */

void ExtFSExit(void)
{
        // Delete all FSItems
        FSItem *p = first_fs_item, *next;
        while (p) {
                next = p->next;
                delete[] p->name;
                delete p;
                p = next;
        }
        first_fs_item = last_fs_item = NULL;

        // System specific deinitialization
        extfs_exit();
}


/*
 *  Install file system
 */

void InstallExtFS(void)
{
        int num_blocks = 0xffff;        // Fake number of blocks of our drive
        M68kRegisters r;

        D(bug("InstallExtFS\n"));
        if (!ready)
                return;

        // FSM present?
        r.d[0] = gestaltFSAttr;
        Execute68kTrap(0xa1ad, &r);     // Gestalt()
        D(bug("FSAttr %d, %08x\n", r.d[0], r.a[0]));
        if ((r.d[0] & 0xffff) || !(r.a[0] & (1 << gestaltHasFileSystemManager))) {
                printf("WARNING: No FSM present, disabling ExtFS\n");
                return;
        }

        // Yes, version >=1.2?
        r.d[0] = gestaltFSMVersion;
        Execute68kTrap(0xa1ad, &r);     // Gestalt()
        D(bug("FSMVersion %d, %08x\n", r.d[0], r.a[0]));
        if ((r.d[0] & 0xffff) || (r.a[0] < 0x0120)) {
                printf("WARNING: FSM <1.2 found, disabling ExtFS\n");
                return;
        }

        D(bug("FSM present\n"));

        // Yes, allocate file system stack
        r.d[0] = STACK_SIZE;
        Execute68kTrap(0xa71e, &r);             // NewPtrSysClear()
        if (r.a[0] == 0)
                return;
        uint32 fs_stack = r.a[0];

        // Allocate memory for our data structures and 68k code
        r.d[0] = SIZEOF_fsdat;
        Execute68kTrap(0xa71e, &r);             // NewPtrSysClear()
        if (r.a[0] == 0)
                return;
        fs_data = r.a[0];

        // Set up 68k code fragments
        int p = fs_data + fsCommProcStub;
        WriteMacInt16(p, M68K_EMUL_OP_EXTFS_COMM); p += 2;
        WriteMacInt16(p, M68K_RTD); p += 2;
        WriteMacInt16(p, 10); p += 2;
        if (p - fs_data != fsHFSProcStub)
                goto fsdat_error;
        WriteMacInt16(p, M68K_EMUL_OP_EXTFS_HFS); p += 2;
        WriteMacInt16(p, M68K_RTD); p += 2;
        WriteMacInt16(p, 16);
        p = fs_data + fsAllocateVCB;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x2f09); p+= 2;        // move.l a1,-(sp)
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x7006); p+= 2;        // UTAllocateVCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsAddNewVCB)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x3f00); p+= 2;        // move.w d0,-(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(a7)
        WriteMacInt16(p, 0x2f09); p+= 2;        // move.l a1,-(a7)
        WriteMacInt16(p, 0x7007); p+= 2;        // UTAddNewVCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsDetermineVol)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x2f09); p+= 2;        // move.l a1,-(sp)
        WriteMacInt16(p, 0x2f0a); p+= 2;        // move.l a2,-(sp)
        WriteMacInt16(p, 0x2f0b); p+= 2;        // move.l a3,-(sp)
        WriteMacInt16(p, 0x2f0c); p+= 2;        // move.l a4,-(sp)
        WriteMacInt16(p, 0x701d); p+= 2;        // UTDetermineVol
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsResolveWDCB)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f00); p+= 2;        // move.l d0,-(sp)
        WriteMacInt16(p, 0x3f01); p+= 2;        // move.w d1,-(sp)
        WriteMacInt16(p, 0x3f02); p+= 2;        // move.w d2,-(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x700e); p+= 2;        // UTResolveWDCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsGetDefaultVol)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x7012); p+= 2;        // UTGetDefaultVol
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsGetPathComponentName)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x701c); p+= 2;        // UTGetPathComponentName
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsParsePathname)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x2f09); p+= 2;        // move.l a1,-(sp)
        WriteMacInt16(p, 0x701b); p+= 2;        // UTParsePathname
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsDisposeVCB)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x7008); p+= 2;        // UTDisposeVCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsCheckWDRefNum)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x3f00); p+= 2;        // move.w d0,-(sp)
        WriteMacInt16(p, 0x7013); p+= 2;        // UTCheckWDRefNum
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsSetDefaultVol)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f00); p+= 2;        // move.l d0,-(sp)
        WriteMacInt16(p, 0x2f01); p+= 2;        // move.l d1,-(sp)
        WriteMacInt16(p, 0x3f02); p+= 2;        // move.w d2,-(sp)
        WriteMacInt16(p, 0x7011); p+= 2;        // UTSetDefaultVol
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsAllocateFCB)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x2f09); p+= 2;        // move.l a1,-(sp)
        WriteMacInt16(p, 0x7000); p+= 2;        // UTAllocateFCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsReleaseFCB)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x3f00); p+= 2;        // move.w d0,-(sp)
        WriteMacInt16(p, 0x7001); p+= 2;        // UTReleaseFCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsIndexFCB)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x2f09); p+= 2;        // move.l a1,-(sp)
        WriteMacInt16(p, 0x2f0a); p+= 2;        // move.l a2,-(sp)
        WriteMacInt16(p, 0x7004); p+= 2;        // UTIndexFCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsResolveFCB)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x3f00); p+= 2;        // move.w d0,-(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x7005); p+= 2;        // UTResolveFCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsAdjustEOF)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x3f00); p+= 2;        // move.w d0,-(sp)
        WriteMacInt16(p, 0x7010); p+= 2;        // UTAdjustEOF
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsAllocateWDCB)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x2f08); p+= 2;        // move.l a0,-(sp)
        WriteMacInt16(p, 0x700c); p+= 2;        // UTAllocateWDCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != fsReleaseWDCB)
                goto fsdat_error;
        WriteMacInt16(p, 0x4267); p+= 2;        // clr.w -(sp)
        WriteMacInt16(p, 0x3f00); p+= 2;        // move.w d0,-(sp)
        WriteMacInt16(p, 0x700d); p+= 2;        // UTReleaseWDCB
        WriteMacInt16(p, 0xa824); p+= 2;        // FSMgr
        WriteMacInt16(p, 0x301f); p+= 2;        // move.w (sp)+,d0
        WriteMacInt16(p, M68K_RTS); p+= 2;
        if (p - fs_data != SIZEOF_fsdat)
                goto fsdat_error;

        // Set up drive status
        WriteMacInt8(fs_data + fsDrvStatus + dsDiskInPlace, 8); // Fixed disk
        WriteMacInt8(fs_data + fsDrvStatus + dsInstalled, 1);
        WriteMacInt16(fs_data + fsDrvStatus + dsQType, hard20);
        WriteMacInt16(fs_data + fsDrvStatus + dsDriveSize, num_blocks & 0xffff);
        WriteMacInt16(fs_data + fsDrvStatus + dsDriveS1, num_blocks >> 16);
        WriteMacInt16(fs_data + fsDrvStatus + dsQFSID, MY_FSID);

        // Add drive to drive queue
        drive_number = FindFreeDriveNumber(1);
        D(bug(" adding drive %d\n", drive_number));
        r.d[0] = (drive_number << 16) | (DiskRefNum & 0xffff);
        r.a[0] = fs_data + fsDrvStatus + dsQLink;
        Execute68kTrap(0xa04e, &r);     // AddDrive()

        // Init FSDRec and install file system
        D(bug(" installing file system\n"));
        WriteMacInt16(fs_data + fsFSD + fsdLength, SIZEOF_FSDRec);
        WriteMacInt16(fs_data + fsFSD + fsdVersion, fsdVersion1);
        WriteMacInt16(fs_data + fsFSD + fileSystemFSID, MY_FSID);
        Host2Mac_memcpy(fs_data + fsFSD + fileSystemName, FS_NAME, 32);
        WriteMacInt32(fs_data + fsFSD + fileSystemCommProc, fs_data + fsCommProcStub);
        WriteMacInt32(fs_data + fsFSD + fsdHFSCI + compInterfProc, fs_data + fsHFSProcStub);
        WriteMacInt32(fs_data + fsFSD + fsdHFSCI + stackTop, fs_stack + STACK_SIZE);
        WriteMacInt32(fs_data + fsFSD + fsdHFSCI + stackSize, STACK_SIZE);
        WriteMacInt32(fs_data + fsFSD + fsdHFSCI + idSector, (uint32)-1);
        r.a[0] = fs_data + fsFSD;
        r.d[0] = 0;                                     // InstallFS
        Execute68kTrap(0xa0ac, &r);     // FSMDispatch()
        D(bug(" InstallFS() returned %d\n", r.d[0]));

        // Enable HFS component
        D(bug(" enabling HFS component\n"));
        WriteMacInt32(fs_data + fsFSD + fsdHFSCI + compInterfMask, ReadMacInt32(fs_data + fsFSD + fsdHFSCI + compInterfMask) | (fsmComponentEnableMask | hfsCIResourceLoadedMask | hfsCIDoesHFSMask));
        r.a[0] = fs_data + fsFSD;
        r.d[3] = SIZEOF_FSDRec;
        r.d[4] = MY_FSID;
        r.d[0] = 5;                                     // SetFSInfo
        Execute68kTrap(0xa0ac, &r);     // FSMDispatch()
        D(bug(" SetFSInfo() returned %d\n", r.d[0]));

        // Mount volume
        D(bug(" mounting volume\n"));
        WriteMacInt32(fs_data + fsPB + ioBuffer, fs_data + fsVMI);
        WriteMacInt16(fs_data + fsVMI + vmiLength, SIZEOF_VolumeMountInfoHeader);
        WriteMacInt32(fs_data + fsVMI + vmiMedia, MY_MEDIA_TYPE);
        r.a[0] = fs_data + fsPB;
        r.d[0] = 0x41;                          // PBVolumeMount
        Execute68kTrap(0xa260, &r);     // HFSDispatch()
        D(bug(" PBVolumeMount() returned %d\n", r.d[0]));
        return;

fsdat_error:
        printf("FATAL: ExtFS data block initialization error\n");
        QuitEmulator();
}


/*
 *  FS communications function
 */

int16 ExtFSComm(uint16 message, uint32 paramBlock, uint32 globalsPtr)
{
        D(bug("ExtFSComm(%d, %08lx, %08lx)\n", message, paramBlock, globalsPtr));

        switch (message) {
                case ffsNopMessage:
                case ffsLoadMessage:
                case ffsUnloadMessage:
                        return noErr;

                case ffsGetIconMessage: {               // Get disk/drive icon
                        if (ReadMacInt8(paramBlock + iconType) == kLargeIcon && ReadMacInt32(paramBlock + requestSize) >= sizeof(ExtFSIcon)) {
                                Host2Mac_memcpy(ReadMacInt32(paramBlock + iconBufferPtr), ExtFSIcon, sizeof(ExtFSIcon));
                                WriteMacInt32(paramBlock + actualSize, sizeof(ExtFSIcon));
                                return noErr;
                        } else
                                return -5012;   // afpItemNotFound
                }

                case ffsIDDiskMessage: {                // Check if volume is handled by our FS
                        if ((int16)ReadMacInt16(paramBlock + ioVRefNum) == drive_number)
                                return noErr;
                        else
                                return extFSErr;
                }

                case ffsIDVolMountMessage: {    // Check if volume can be mounted by our FS
                        if (ReadMacInt32(ReadMacInt32(paramBlock + ioBuffer) + vmiMedia) == MY_MEDIA_TYPE)
                                return noErr;
                        else
                                return extFSErr;
                }

                default:
                        return fsmUnknownFSMMessageErr;
        }
}


/*
 *  Get current directory specified by given ParamBlock/dirID
 */

static int16 get_current_dir(uint32 pb, uint32 dirID, uint32 &current_dir, bool no_vol_name = false)
{
        M68kRegisters r;
        int16 result;

        // Determine volume
        D(bug("  determining volume, dirID %d\n", dirID));
        r.a[0] = pb;
        r.a[1] = fs_data + fsReturn;
        r.a[2] = fs_data + fsReturn + 2;
        r.a[3] = fs_data + fsReturn + 4;
        r.a[4] = fs_data + fsReturn + 6;
        uint32 name_ptr = 0;
        if (no_vol_name) {
                name_ptr = ReadMacInt32(pb + ioNamePtr);
                WriteMacInt32(pb + ioNamePtr, 0);
        }
        Execute68k(fs_data + fsDetermineVol, &r);
        if (no_vol_name)
                WriteMacInt32(pb + ioNamePtr, name_ptr);
        int16 status = ReadMacInt16(fs_data + fsReturn);
        D(bug("  UTDetermineVol() returned %d, status %d\n", r.d[0], status));
        result = (int16)(r.d[0] & 0xffff);

        if (result == noErr) {
                switch (status) {
                        case dtmvFullPathname:  // Determined by full pathname
                                current_dir = ROOT_ID;
                                break;

                        case dtmvVRefNum:               // Determined by refNum or by drive number
                        case dtmvDriveNum:
                                current_dir = dirID ? dirID : ROOT_ID;
                                break;

                        case dtmvWDRefNum:              // Determined by working directory refNum
                                if (dirID)
                                        current_dir = dirID;
                                else {
                                        D(bug("  resolving WDCB\n"));
                                        r.d[0] = 0;
                                        r.d[1] = 0;
                                        r.d[2] = ReadMacInt16(pb + ioVRefNum);
                                        r.a[0] = fs_data + fsReturn;
                                        Execute68k(fs_data + fsResolveWDCB, &r);
                                        uint32 wdcb = ReadMacInt32(fs_data + fsReturn);
                                        D(bug("  UTResolveWDCB() returned %d, dirID %d\n", r.d[0], ReadMacInt32(wdcb + wdDirID)));
                                        result = (int16)(r.d[0] & 0xffff);
                                        if (result == noErr)
                                                current_dir = ReadMacInt32(wdcb + wdDirID);
                                }
                                break;

                        case dtmvDefault:               // Determined by default volume
                                if (dirID)
                                        current_dir = dirID;
                                else {
                                        uint32 wdpb = fs_data + fsReturn;
                                        WriteMacInt32(wdpb + ioNamePtr, 0);
                                        D(bug("  getting default volume\n"));
                                        r.a[0] = wdpb;
                                        Execute68k(fs_data + fsGetDefaultVol, &r);
                                        D(bug("  UTGetDefaultVol() returned %d, dirID %d\n", r.d[0], ReadMacInt32(wdpb + ioWDDirID)));
                                        result = (int16)(r.d[0] & 0xffff);
                                        if (result == noErr)
                                                current_dir = ReadMacInt32(wdpb + ioWDDirID);
                                }
                                break;

                        default:
                                result = paramErr;
                                break;
                }
        }
        return result;
}


/*
 *  Get path component name
 */

static int16 get_path_component_name(uint32 rec)
{
//      D(bug("  getting path component\n"));
        M68kRegisters r;
        r.a[0] = rec;
        Execute68k(fs_data + fsGetPathComponentName, &r);
//      D(bug("  UTGetPathComponentName returned %d\n", r.d[0]));
        return (int16)(r.d[0] & 0xffff);
}


/*
 *  Get FSItem and full path (->full_path) for file/dir specified in ParamBlock
 */

static int16 get_item_and_path(uint32 pb, uint32 dirID, FSItem *&item, bool no_vol_name = false)
{
        M68kRegisters r;

        // Find FSItem for parent directory
        int16 result;
        uint32 current_dir;
        if ((result = get_current_dir(pb, dirID, current_dir, no_vol_name)) != noErr)
                return result;
        D(bug("  current dir %08x\n", current_dir));
        FSItem *p = find_fsitem_by_id(current_dir);
        if (p == NULL)
                return dirNFErr;

        // Start parsing
        uint32 parseRec = fs_data + fsParseRec;
        WriteMacInt32(parseRec + ppNamePtr, ReadMacInt32(pb + ioNamePtr));
        WriteMacInt16(parseRec + ppStartOffset, 0);
        WriteMacInt16(parseRec + ppComponentLength, 0);
        WriteMacInt8(parseRec + ppMoreName, false);
        WriteMacInt8(parseRec + ppFoundDelimiter, false);

        // Get length of volume name
        D(bug("  parsing pathname\n"));
        r.a[0] = parseRec + ppStartOffset;
        r.a[1] = ReadMacInt32(parseRec + ppNamePtr);
        Execute68k(fs_data + fsParsePathname, &r);
        D(bug("  UTParsePathname() returned %d, startOffset %d\n", r.d[0], ReadMacInt16(parseRec + ppStartOffset)));
        result = (int16)(r.d[0] & 0xffff);
        if (result == noErr) {

                // Check for leading delimiter of the partial pathname
                result = get_path_component_name(parseRec);
                if (result == noErr) {
                        if (ReadMacInt16(parseRec + ppComponentLength) == 0 && ReadMacInt8(parseRec + ppFoundDelimiter)) {
                                // Get past initial delimiter
                                WriteMacInt16(parseRec + ppStartOffset, ReadMacInt16(parseRec + ppStartOffset) + 1);
                        }

                        // Parse until there is no more pathname to parse
                        while ((result == noErr) && ReadMacInt8(parseRec + ppMoreName)) {

                                // Search for the next delimiter from startOffset
                                result = get_path_component_name(parseRec);
                                if (result == noErr) {
                                        if (ReadMacInt16(parseRec + ppComponentLength) == 0) {

                                                // Delimiter immediately following another delimiter, get parent
                                                if (current_dir != ROOT_ID) {
                                                        p = p->parent;
                                                        current_dir = p->id;
                                                } else
                                                        result = bdNamErr;

                                                // startOffset = start of next component
                                                WriteMacInt16(parseRec + ppStartOffset, ReadMacInt16(parseRec + ppStartOffset) + 1);

                                        } else if (ReadMacInt8(parseRec + ppMoreName)) {

                                                // Component found and isn't the last, so it must be a directory, enter it
                                                char name[32];
                                                strn2cstr(name, (char *)Mac2HostAddr(ReadMacInt32(parseRec + ppNamePtr)) + ReadMacInt16(parseRec + ppStartOffset) + 1, ReadMacInt16(parseRec + ppComponentLength));
                                                D(bug("  entering %s\n", name));
                                                p = find_fsitem_guest(name, p);
                                                current_dir = p->id;

                                                // startOffset = start of next component
                                                WriteMacInt16(parseRec + ppStartOffset, ReadMacInt16(parseRec + ppStartOffset) + ReadMacInt16(parseRec + ppComponentLength) + 1);
                                        }
                                }
                        }

                        if (result == noErr) {

                                // There is no more pathname to parse
                                if (ReadMacInt16(parseRec + ppComponentLength) == 0) {

                                        // Pathname ended with '::' or was simply a volume name, so current directory is the object
                                        item = p;

                                } else {

                                        // Pathname ended with 'name:' or 'name', so name is the object
                                        char name[32];
                                        strn2cstr(name, (char *)Mac2HostAddr(ReadMacInt32(parseRec + ppNamePtr)) + ReadMacInt16(parseRec + ppStartOffset) + 1, ReadMacInt16(parseRec + ppComponentLength));
                                        D(bug("  object is %s\n", name));
                                        item = find_fsitem_guest(name, p);
                                }
                        }
                }

        } else {

                // Default to bad name
                result = bdNamErr;

                if (ReadMacInt32(pb + ioNamePtr) == 0 || ReadMacInt8(ReadMacInt32(pb + ioNamePtr)) == 0) {

                        // Pathname was NULL or a zero length string, so we found a directory at the end of the string
                        item = p;
                        result = noErr;
                }
        }

        // Eat the path
        if (result == noErr) {
                get_path_for_fsitem(item);
                D(bug("  path %s\n", full_path));
        }
        return result;
}


/*
 *  Find FCB for given file RefNum
 */

static uint32 find_fcb(int16 refNum)
{
        D(bug("  finding FCB\n"));
        M68kRegisters r;
        r.d[0] = refNum;
        r.a[0] = fs_data + fsReturn;
        Execute68k(fs_data + fsResolveFCB, &r);
        uint32 fcb = ReadMacInt32(fs_data + fsReturn);
        D(bug("  UTResolveFCB() returned %d, fcb %08lx\n", r.d[0], fcb));
        if (r.d[0] & 0xffff)
                return 0;
        else
                return fcb;
}


/*
 *  HFS interface functions
 */

// Check if volume belongs to our FS
static int16 fs_mount_vol(uint32 pb)
{
        D(bug(" fs_mount_vol(%08lx), vRefNum %d\n", pb, ReadMacInt16(pb + ioVRefNum)));
        if ((int16)ReadMacInt16(pb + ioVRefNum) == drive_number)
                return noErr;
        else
                return extFSErr;
}

// Mount volume
static int16 fs_volume_mount(uint32 pb)
{
        D(bug(" fs_volume_mount(%08lx)\n", pb));
        M68kRegisters r;

        // Create new VCB
        D(bug("  creating VCB\n"));
        r.a[0] = fs_data + fsReturn;
        r.a[1] = fs_data + fsReturn + 2;
        Execute68k(fs_data + fsAllocateVCB, &r);
#if DEBUG
        uint16 sysVCBLength = ReadMacInt16(fs_data + fsReturn);
#endif
        uint32 vcb = ReadMacInt32(fs_data + fsReturn + 2);
        D(bug("  UTAllocateVCB() returned %d, vcb %08lx, size %d\n", r.d[0], vcb, sysVCBLength));
        if (r.d[0] & 0xffff)
                return (int16)r.d[0];

        // Init VCB
        WriteMacInt16(vcb + vcbSigWord, 0x4244);
#if defined(__BEOS__) || defined(WIN32)
        WriteMacInt32(vcb + vcbCrDate, TimeToMacTime(root_stat.st_crtime));
#elif defined __APPLE__ && defined __MACH__
        WriteMacInt32(vcb + vcbCrDate, get_creation_time(RootPath));
#else
        WriteMacInt32(vcb + vcbCrDate, 0);
#endif
        WriteMacInt32(vcb + vcbLsMod, TimeToMacTime(root_stat.st_mtime));
        WriteMacInt32(vcb + vcbVolBkUp, 0);
        WriteMacInt16(vcb + vcbNmFls, 1);                       //!!
        WriteMacInt16(vcb + vcbNmRtDirs, 1);            //!!
        WriteMacInt16(vcb + vcbNmAlBlks, 0xffff);       //!!
        WriteMacInt32(vcb + vcbAlBlkSiz, AL_BLK_SIZE);
        WriteMacInt32(vcb + vcbClpSiz, CLUMP_SIZE);
        WriteMacInt32(vcb + vcbNxtCNID, next_cnid);
        WriteMacInt16(vcb + vcbFreeBks, 0xffff);        //!!
        Host2Mac_memcpy(vcb + vcbVN, VOLUME_NAME, 28);
        WriteMacInt16(vcb + vcbFSID, MY_FSID);
        WriteMacInt32(vcb + vcbFilCnt, 1);                      //!!
        WriteMacInt32(vcb + vcbDirCnt, 1);                      //!!

        // Add VCB to VCB queue
        D(bug("  adding VCB to queue\n"));
        r.d[0] = drive_number;
        r.a[0] = fs_data + fsReturn;
        r.a[1] = vcb;
        Execute68k(fs_data + fsAddNewVCB, &r);
        int16 vRefNum = (int16)ReadMacInt32(fs_data + fsReturn);
        D(bug("  UTAddNewVCB() returned %d, vRefNum %d\n", r.d[0], vRefNum));
        if (r.d[0] & 0xffff)
                return (int16)r.d[0];

        // Post diskInsertEvent
        D(bug("  posting diskInsertEvent\n"));
        r.d[0] = drive_number;
        r.a[0] = 7;     // diskEvent
        Execute68kTrap(0xa02f, &r);             // PostEvent()

        // Return volume RefNum
        WriteMacInt16(pb + ioVRefNum, vRefNum);
        return noErr;
}

// Unmount volume
static int16 fs_unmount_vol(uint32 vcb)
{
        D(bug(" fs_unmount_vol(%08lx), vRefNum %d\n", vcb, ReadMacInt16(vcb + vcbVRefNum)));
        M68kRegisters r;

        // Remove and free VCB
        D(bug("  freeing VCB\n"));
        r.a[0] = vcb;
        Execute68k(fs_data + fsDisposeVCB, &r);
        D(bug("  UTDisposeVCB() returned %d\n", r.d[0]));
        return (int16)r.d[0];
}

// Get information about a volume (HVolumeParam)
static int16 fs_get_vol_info(uint32 pb, bool hfs)
{
//      D(bug(" fs_get_vol_info(%08lx)\n", pb));

        // Fill in struct
        if (ReadMacInt32(pb + ioNamePtr))
                pstrcpy((char *)Mac2HostAddr(ReadMacInt32(pb + ioNamePtr)), VOLUME_NAME);
#if defined(__BEOS__) || defined(WIN32)
        WriteMacInt32(pb + ioVCrDate, TimeToMacTime(root_stat.st_crtime));
#elif defined __APPLE__ && defined __MACH__
        WriteMacInt32(pb + ioVCrDate, get_creation_time(RootPath));
#else
        WriteMacInt32(pb + ioVCrDate, 0);
#endif
        WriteMacInt32(pb + ioVLsMod, TimeToMacTime(root_stat.st_mtime));
        WriteMacInt16(pb + ioVAtrb, 0);
        WriteMacInt16(pb + ioVNmFls, 1);                        //!!
        WriteMacInt16(pb + ioVBitMap, 0);
        WriteMacInt16(pb + ioAllocPtr, 0);
        WriteMacInt16(pb + ioVNmAlBlks, 0xffff);        //!!
        WriteMacInt32(pb + ioVAlBlkSiz, AL_BLK_SIZE);
        WriteMacInt32(pb + ioVClpSiz, CLUMP_SIZE);
        WriteMacInt16(pb + ioAlBlSt, 0);
        WriteMacInt32(pb + ioVNxtCNID, next_cnid);
        WriteMacInt16(pb + ioVFrBlk, 0xffff);           //!!
        if (hfs) {
                WriteMacInt16(pb + ioVDrvInfo, drive_number);
                WriteMacInt16(pb + ioVDRefNum, ReadMacInt16(fs_data + fsDrvStatus + dsQRefNum));
                WriteMacInt16(pb + ioVFSID, MY_FSID);
                WriteMacInt32(pb + ioVBkUp, 0);
                WriteMacInt16(pb + ioVSeqNum, 0);
                WriteMacInt32(pb + ioVWrCnt, 0);
                WriteMacInt32(pb + ioVFilCnt, 1);                       //!!
                WriteMacInt32(pb + ioVDirCnt, 1);                       //!!
                Mac_memset(pb + ioVFndrInfo, 0, 32);
        }
        return noErr;
}

// Change volume information (HVolumeParam)
static int16 fs_set_vol_info(uint32 pb)
{
        D(bug(" fs_set_vol_info(%08lx)\n", pb));

        //!! times
        return noErr;
}

// Get volume parameter block
static int16 fs_get_vol_parms(uint32 pb)
{
//      D(bug(" fs_get_vol_parms(%08lx)\n", pb));

        // Return parameter block
        uint32 actual = ReadMacInt32(pb + ioReqCount);
        if (actual > SIZEOF_GetVolParmsInfoBuffer)
                actual = SIZEOF_GetVolParmsInfoBuffer;
        WriteMacInt32(pb + ioActCount, actual);
        uint32 p = ReadMacInt32(pb + ioBuffer);
        if (actual > vMVersion) WriteMacInt16(p + vMVersion, 2);
        if (actual > vMAttrib) WriteMacInt32(p + vMAttrib, kNoMiniFndr | kNoVNEdit | kNoLclSync | kTrshOffLine | kNoSwitchTo | kNoBootBlks | kNoSysDir | kHasExtFSVol);
        if (actual > vMLocalHand) WriteMacInt32(p + vMLocalHand, 0);
        if (actual > vMServerAdr) WriteMacInt32(p + vMServerAdr, 0);
        if (actual > vMVolumeGrade) WriteMacInt32(p + vMVolumeGrade, 0);
        if (actual > vMForeignPrivID) WriteMacInt16(p + vMForeignPrivID, 0);
        return noErr;
}

// Get default volume (WDParam)
static int16 fs_get_vol(uint32 pb)
{
        D(bug(" fs_get_vol(%08lx)\n", pb));
        M68kRegisters r;

        // Getting default volume
        D(bug("  getting default volume\n"));
        r.a[0] = pb;
        Execute68k(fs_data + fsGetDefaultVol, &r);
        D(bug("  UTGetDefaultVol() returned %d\n", r.d[0]));
        return (int16)r.d[0];
}

// Set default volume (WDParam)
static int16 fs_set_vol(uint32 pb, bool hfs, uint32 vcb)
{
        D(bug(" fs_set_vol(%08lx), vRefNum %d, name %.31s, dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), ReadMacInt32(pb + ioWDDirID)));
        M68kRegisters r;

        // Determine parameters
        uint32 dirID;
        int16 refNum;
        if (hfs) {

                // Find FSItem for given dir
                FSItem *fs_item;
                int16 result = get_item_and_path(pb, ReadMacInt32(pb + ioWDDirID), fs_item);
                if (result != noErr)
                        return result;

                // Is it a directory?
                struct stat st;
                if (stat(full_path, &st))
                        return dirNFErr;
                if (!S_ISDIR(st.st_mode))
                        return dirNFErr;

                // Get dirID and refNum
                dirID = fs_item->id;
                refNum = ReadMacInt16(vcb + vcbVRefNum);

        } else {

                // Is the given vRefNum a working directory number?
                D(bug("  checking for WDRefNum\n"));
                r.d[0] = ReadMacInt16(pb + ioVRefNum);
                Execute68k(fs_data + fsCheckWDRefNum, &r);
                D(bug("  UTCheckWDRefNum() returned %d\n", r.d[0]));
                if (r.d[0] & 0xffff) {
                        // Volume refNum
                        dirID = ROOT_ID;
                        refNum = ReadMacInt16(vcb + vcbVRefNum);
                } else {
                        // WD refNum
                        dirID = 0;
                        refNum = ReadMacInt16(pb + ioVRefNum);
                }
        }

        // Setting default volume
        D(bug("  setting default volume\n"));
        r.d[0] = 0;
        r.d[1] = dirID;
        r.d[2] = refNum;
        Execute68k(fs_data + fsSetDefaultVol, &r);
        D(bug("  UTSetDefaultVol() returned %d\n", r.d[0]));
        return (int16)r.d[0];
}

// Query file attributes (HFileParam)
static int16 fs_get_file_info(uint32 pb, bool hfs, uint32 dirID)
{
        D(bug(" fs_get_file_info(%08lx), vRefNum %d, name %.31s, idx %d, dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), ReadMacInt16(pb + ioFDirIndex), dirID));

        FSItem *fs_item;
        int16 dir_index = ReadMacInt16(pb + ioFDirIndex);
        if (dir_index <= 0) {           // Query item specified by ioDirID and ioNamePtr

                // Find FSItem for given file
                int16 result = get_item_and_path(pb, dirID, fs_item);
                if (result != noErr)
                        return result;

        } else {                                        // Query item in directory specified by ioDirID by index

                // Find FSItem for parent directory
                int16 result;
                uint32 current_dir;
                if ((result = get_current_dir(pb, dirID, current_dir, true)) != noErr)
                        return result;
                FSItem *p = find_fsitem_by_id(current_dir);
                if (p == NULL)
                        return dirNFErr;
                get_path_for_fsitem(p);

                // Look for nth item in directory and add name to path
                DIR *d = opendir(full_path);
                if (d == NULL)
                        return dirNFErr;
                struct dirent *de = NULL;
                for (int i=0; i<dir_index; i++) {
read_next_de:
                        de = readdir(d);
                        if (de == NULL) {
                                closedir(d);
                                return fnfErr;
                        }
                        if (de->d_name[0] == '.')
                                goto read_next_de;      // Suppress names beginning with '.' (MacOS could interpret these as driver names)
                        //!! suppress directories
                }
                add_path_comp(de->d_name);

                // Get FSItem for queried item
                fs_item = find_fsitem(de->d_name, p);
                closedir(d);
        }

        // Get stats
        struct stat st;
        if (stat(full_path, &st))
                return fnfErr;
        if (S_ISDIR(st.st_mode))
                return fnfErr;

        // Fill in struct from fs_item and stats
        if (ReadMacInt32(pb + ioNamePtr))
                cstr2pstr((char *)Mac2HostAddr(ReadMacInt32(pb + ioNamePtr)), fs_item->guest_name);
        WriteMacInt16(pb + ioFRefNum, 0);
        WriteMacInt8(pb + ioFlAttrib, access(full_path, W_OK) == 0 ? 0 : faLocked);
        WriteMacInt32(pb + ioDirID, fs_item->id);

#if defined(__BEOS__) || defined(WIN32)
        WriteMacInt32(pb + ioFlCrDat, TimeToMacTime(st.st_crtime));
#elif defined __APPLE__ && defined __MACH__
        WriteMacInt32(pb + ioFlCrDat, get_creation_time(full_path));
#else
        WriteMacInt32(pb + ioFlCrDat, 0);
#endif
        WriteMacInt32(pb + ioFlMdDat, TimeToMacTime(st.st_mtime));

        get_finfo(full_path, pb + ioFlFndrInfo, hfs ? pb + ioFlXFndrInfo : 0, false);

        WriteMacInt16(pb + ioFlStBlk, 0);
        WriteMacInt32(pb + ioFlLgLen, st.st_size);
        WriteMacInt32(pb + ioFlPyLen, (st.st_size | (AL_BLK_SIZE - 1)) + 1);
        WriteMacInt16(pb + ioFlRStBlk, 0);
        uint32 rf_size = get_rfork_size(full_path);
        WriteMacInt32(pb + ioFlRLgLen, rf_size);
        WriteMacInt32(pb + ioFlRPyLen, (rf_size | (AL_BLK_SIZE - 1)) + 1);

        if (hfs) {
                WriteMacInt32(pb + ioFlBkDat, 0);
                WriteMacInt32(pb + ioFlParID, fs_item->parent_id);
                WriteMacInt32(pb + ioFlClpSiz, 0);
        }
        return noErr;
}

// Set file attributes (HFileParam)
static int16 fs_set_file_info(uint32 pb, bool hfs, uint32 dirID)
{
        D(bug(" fs_set_file_info(%08lx), vRefNum %d, name %.31s, idx %d, dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), ReadMacInt16(pb + ioFDirIndex), dirID));

        // Find FSItem for given file/dir
        FSItem *fs_item;
        int16 result = get_item_and_path(pb, dirID, fs_item);
        if (result != noErr)
                return result;

        // Get stats
        struct stat st;
        if (stat(full_path, &st) < 0)
                return errno2oserr();
        if (S_ISDIR(st.st_mode))
                return fnfErr;

        // Set Finder info
        set_finfo(full_path, pb + ioFlFndrInfo, hfs ? pb + ioFlXFndrInfo : 0, false);

        //!! times
        return noErr;
}

// Query file/directory attributes
static int16 fs_get_cat_info(uint32 pb)
{
        D(bug(" fs_get_cat_info(%08lx), vRefNum %d, name %.31s, idx %d, dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), ReadMacInt16(pb + ioFDirIndex), ReadMacInt32(pb + ioDirID)));

        FSItem *fs_item;
        int16 dir_index = ReadMacInt16(pb + ioFDirIndex);
        if (dir_index < 0) {                    // Query directory specified by ioDirID

                // Find FSItem for directory
                fs_item = find_fsitem_by_id(ReadMacInt32(pb + ioDrDirID));
                if (fs_item == NULL)
                        return dirNFErr;
                get_path_for_fsitem(fs_item);

        } else if (dir_index == 0) {    // Query item specified by ioDirID and ioNamePtr

                // Find FSItem for given file/dir
                int16 result = get_item_and_path(pb, ReadMacInt32(pb + ioDirID), fs_item);
                if (result != noErr)
                        return result;

        } else {                                                        // Query item in directory specified by ioDirID by index

                // Find FSItem for parent directory
                int16 result;
                uint32 current_dir;
                if ((result = get_current_dir(pb, ReadMacInt32(pb + ioDirID), current_dir, true)) != noErr)
                        return result;
                FSItem *p = find_fsitem_by_id(current_dir);
                if (p == NULL)
                        return dirNFErr;
                get_path_for_fsitem(p);

                // Look for nth item in directory and add name to path
                DIR *d = opendir(full_path);
                if (d == NULL)
                        return dirNFErr;
                struct dirent *de = NULL;
                for (int i=0; i<dir_index; i++) {
read_next_de:
                        de = readdir(d);
                        if (de == NULL) {
                                closedir(d);
                                return fnfErr;
                        }
                        if (de->d_name[0] == '.')
                                goto read_next_de;      // Suppress names beginning with '.' (MacOS could interpret these as driver names)
                }
                add_path_comp(de->d_name);

                // Get FSItem for queried item
                fs_item = find_fsitem(de->d_name, p);
                closedir(d);
        }
        D(bug("  path %s\n", full_path));

        // Get stats
        struct stat st;
        if (stat(full_path, &st) < 0)
                return errno2oserr();
        if (dir_index == -1 && !S_ISDIR(st.st_mode))
                return dirNFErr;

        // Fill in struct from fs_item and stats
        if (ReadMacInt32(pb + ioNamePtr))
                cstr2pstr((char *)Mac2HostAddr(ReadMacInt32(pb + ioNamePtr)), fs_item->guest_name);
        WriteMacInt16(pb + ioFRefNum, 0);
        WriteMacInt8(pb + ioFlAttrib, (S_ISDIR(st.st_mode) ? faIsDir : 0) | (access(full_path, W_OK) == 0 ? 0 : faLocked));
        WriteMacInt8(pb + ioACUser, 0);
        WriteMacInt32(pb + ioDirID, fs_item->id);
        WriteMacInt32(pb + ioFlParID, fs_item->parent_id);
#if defined(__BEOS__) || defined(WIN32)
        WriteMacInt32(pb + ioFlCrDat, TimeToMacTime(st.st_crtime));
#elif defined __APPLE__ && defined __MACH__
        WriteMacInt32(pb + ioFlCrDat, get_creation_time(full_path));
#else
        WriteMacInt32(pb + ioFlCrDat, 0);
#endif
        time_t mtime = st.st_mtime;
        bool cached = true;
        if (mtime > fs_item->mtime) {
                fs_item->mtime = mtime;
                cached = false;
        }
        WriteMacInt32(pb + ioFlMdDat, TimeToMacTime(mtime));
        WriteMacInt32(pb + ioFlBkDat, 0);

        get_finfo(full_path, pb + ioFlFndrInfo, pb + ioFlXFndrInfo, S_ISDIR(st.st_mode));

        if (S_ISDIR(st.st_mode)) {

                // Determine number of files in directory (cached)
                int count;
                if (cached)
                        count = fs_item->cache_dircount;
                else {
                        count = 0;
                        DIR *d = opendir(full_path);
                        if (d) {
                                struct dirent *de;
                                for (;;) {
                                        de = readdir(d);
                                        if (de == NULL)
                                                break;
                                        if (de->d_name[0] == '.')
                                                continue;       // Suppress names beginning with '.'
                                        count++;
                                }
                                closedir(d);
                        }
                        fs_item->cache_dircount = count;
                }
                WriteMacInt16(pb + ioDrNmFls, count);
        } else {
                WriteMacInt16(pb + ioFlStBlk, 0);
                WriteMacInt32(pb + ioFlLgLen, st.st_size);
                WriteMacInt32(pb + ioFlPyLen, (st.st_size | (AL_BLK_SIZE - 1)) + 1);
                WriteMacInt16(pb + ioFlRStBlk, 0);
                uint32 rf_size = get_rfork_size(full_path);
                WriteMacInt32(pb + ioFlRLgLen, rf_size);
                WriteMacInt32(pb + ioFlRPyLen, (rf_size | (AL_BLK_SIZE - 1)) + 1);
                WriteMacInt32(pb + ioFlClpSiz, 0);
        }
        return noErr;
}

// Set file/directory attributes
static int16 fs_set_cat_info(uint32 pb)
{
        D(bug(" fs_set_cat_info(%08lx), vRefNum %d, name %.31s, idx %d, dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), ReadMacInt16(pb + ioFDirIndex), ReadMacInt32(pb + ioDirID)));

        // Find FSItem for given file/dir
        FSItem *fs_item;
        int16 result = get_item_and_path(pb, ReadMacInt32(pb + ioDirID), fs_item);
        if (result != noErr)
                return result;

        // Get stats
        struct stat st;
        if (stat(full_path, &st) < 0)
                return errno2oserr();

        // Set Finder info
        set_finfo(full_path, pb + ioFlFndrInfo, pb + ioFlXFndrInfo, S_ISDIR(st.st_mode));

        //!! times
        return noErr;
}

// Open file
static int16 fs_open(uint32 pb, uint32 dirID, uint32 vcb, bool resource_fork)
{
        D(bug(" fs_open(%08lx), %s, vRefNum %d, name %.31s, dirID %d, perm %d\n", pb, resource_fork ? "rsrc" : "data", ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), dirID, ReadMacInt8(pb + ioPermssn)));
        M68kRegisters r;

        // Find FSItem for given file
        FSItem *fs_item;
        int16 result = get_item_and_path(pb, dirID, fs_item);
        if (result != noErr)
                return result;

        // Convert ioPermssn to open() flag
        int flag = 0;
        bool write_ok = (access(full_path, W_OK) == 0);
        switch (ReadMacInt8(pb + ioPermssn)) {
                case fsCurPerm:         // Whatever is currently allowed
                        if (write_ok)
                                flag = O_RDWR;
                        else
                                flag = O_RDONLY;
                        break;
                case fsRdPerm:          // Exclusive read
                        flag = O_RDONLY;
                        break;
                case fsWrPerm:          // Exclusive write
                        flag = O_WRONLY;
                        break;
                case fsRdWrPerm:        // Exclusive read/write
                case fsRdWrShPerm:      // Shared read/write
                default:
                        flag = O_RDWR;
                        break;
        }

        // Try to open and stat the file
        int fd = -1;
        struct stat st;
        if (resource_fork) {
                if (access(full_path, F_OK))
                        return fnfErr;
                fd = open_rfork(full_path, flag);
                if (fd >= 0) {
                        if (fstat(fd, &st) < 0) {
                                close(fd);
                                return errno2oserr();
                        }
                } else {        // Resource fork not supported, silently ignore it ("pseudo" resource fork)
                        st.st_size = 0;
                        st.st_mode = 0;
                }
        } else {
                fd = open(full_path, flag);
                if (fd < 0)
                        return errno2oserr();
                if (fstat(fd, &st) < 0) {
                        close(fd);
                        return errno2oserr();
                }
        }

        // File open, allocate FCB
        D(bug("  allocating FCB\n"));
        r.a[0] = pb + ioRefNum;
        r.a[1] = fs_data + fsReturn;
        Execute68k(fs_data + fsAllocateFCB, &r);
        uint32 fcb = ReadMacInt32(fs_data + fsReturn);
        D(bug("  UTAllocateFCB() returned %d, fRefNum %d, fcb %08lx\n", r.d[0], ReadMacInt16(pb + ioRefNum), fcb));
        if (r.d[0] & 0xffff) {
                close(fd);
                return (int16)r.d[0];
        }

        // Initialize FCB, fd is stored in fcbCatPos
        WriteMacInt32(fcb + fcbFlNm, fs_item->id);
        WriteMacInt8(fcb + fcbFlags, ((flag == O_WRONLY || flag == O_RDWR) ? fcbWriteMask : 0) | (resource_fork ? fcbResourceMask : 0) | (write_ok ? 0 : fcbFileLockedMask));
        WriteMacInt32(fcb + fcbEOF, st.st_size);
        WriteMacInt32(fcb + fcbPLen, (st.st_size | (AL_BLK_SIZE - 1)) + 1);
        WriteMacInt32(fcb + fcbCrPs, 0);
        WriteMacInt32(fcb + fcbVPtr, vcb);
        WriteMacInt32(fcb + fcbClmpSize, CLUMP_SIZE);

        get_finfo(full_path, fs_data + fsPB, 0, false);
        WriteMacInt32(fcb + fcbFType, ReadMacInt32(fs_data + fsPB + fdType));

        WriteMacInt32(fcb + fcbCatPos, fd);
        WriteMacInt32(fcb + fcbDirID, fs_item->parent_id);
        cstr2pstr((char *)Mac2HostAddr(fcb + fcbCName), fs_item->guest_name);
        return noErr;
}

// Close file
static int16 fs_close(uint32 pb)
{
        D(bug(" fs_close(%08lx), refNum %d\n", pb, ReadMacInt16(pb + ioRefNum)));
        M68kRegisters r;

        // Find FCB and fd for file
        uint32 fcb = find_fcb(ReadMacInt16(pb + ioRefNum));
        if (fcb == 0)
                return rfNumErr;
        if (ReadMacInt32(fcb + fcbFlNm) == 0)
                return fnOpnErr;
        int fd = ReadMacInt32(fcb + fcbCatPos);

        // Close file
        if (ReadMacInt8(fcb + fcbFlags) & fcbResourceMask) {
                FSItem *item = find_fsitem_by_id(ReadMacInt32(fcb + fcbFlNm));
                if (item) {
                        get_path_for_fsitem(item);
                        close_rfork(full_path, fd);
                }
        } else
                close(fd);
        WriteMacInt32(fcb + fcbCatPos, (uint32)-1);

        // Release FCB
        D(bug("  releasing FCB\n"));
        r.d[0] = ReadMacInt16(pb + ioRefNum);
        Execute68k(fs_data + fsReleaseFCB, &r);
        D(bug("  UTReleaseFCB() returned %d\n", r.d[0]));
        return (int16)r.d[0];
}

// Query information about FCB (FCBPBRec)
static int16 fs_get_fcb_info(uint32 pb, uint32 vcb)
{
        D(bug(" fs_get_fcb_info(%08lx), vRefNum %d, refNum %d, idx %d\n", pb, ReadMacInt16(pb + ioVRefNum), ReadMacInt16(pb + ioRefNum), ReadMacInt16(pb + ioFCBIndx)));
        M68kRegisters r;

        uint32 fcb = 0;
        if (ReadMacInt16(pb + ioFCBIndx) == 0) {        // Get information about single file

                // Find FCB for file
                fcb = find_fcb(ReadMacInt16(pb + ioRefNum));

        } else {                                        // Get information about file specified by index

                // Find FCB by index
                WriteMacInt16(pb + ioRefNum, 0);
                for (int i=0; i<(int)ReadMacInt16(pb + ioFCBIndx); i++) {
                        D(bug("  indexing FCBs\n"));
                        r.a[0] = vcb;
                        r.a[1] = pb + ioRefNum;
                        r.a[2] = fs_data + fsReturn;
                        Execute68k(fs_data + fsIndexFCB, &r);
                        fcb = ReadMacInt32(fs_data + fsReturn);
                        D(bug("  UTIndexFCB() returned %d, fcb %p\n", r.d[0], fcb));
                        if (r.d[0] & 0xffff)
                                return (int16)r.d[0];
                }
        }
        if (fcb == 0)
                return rfNumErr;

        // Copy information from FCB
        if (ReadMacInt32(pb + ioNamePtr))
                pstrcpy((char *)Mac2HostAddr(ReadMacInt32(pb + ioNamePtr)), (char *)Mac2HostAddr(fcb + fcbCName));
        WriteMacInt32(pb + ioFCBFlNm, ReadMacInt32(fcb + fcbFlNm));
        WriteMacInt8(pb + ioFCBFlags, ReadMacInt8(fcb + fcbFlags));
        WriteMacInt16(pb + ioFCBStBlk, ReadMacInt16(fcb + fcbSBlk));
        WriteMacInt32(pb + ioFCBEOF, ReadMacInt32(fcb + fcbEOF));
        WriteMacInt32(pb + ioFCBPLen, ReadMacInt32(fcb + fcbPLen));
        WriteMacInt32(pb + ioFCBCrPs, ReadMacInt32(fcb + fcbCrPs));
        WriteMacInt16(pb + ioFCBVRefNum, ReadMacInt16(ReadMacInt32(fcb + fcbVPtr) + vcbVRefNum));
        WriteMacInt32(pb + ioFCBClpSiz, ReadMacInt32(fcb + fcbClmpSize));
        WriteMacInt32(pb + ioFCBParID, ReadMacInt32(fcb + fcbDirID));
        return noErr;
}

// Obtain logical size of an open file
static int16 fs_get_eof(uint32 pb)
{
        D(bug(" fs_get_eof(%08lx), refNum %d\n", pb, ReadMacInt16(pb + ioRefNum)));
        M68kRegisters r;

        // Find FCB and fd for file
        uint32 fcb = find_fcb(ReadMacInt16(pb + ioRefNum));
        if (fcb == 0)
                return rfNumErr;
        if (ReadMacInt32(fcb + fcbFlNm) == 0)
                return fnOpnErr;
        int fd = ReadMacInt32(fcb + fcbCatPos);
        if (fd < 0)
                if (ReadMacInt8(fcb + fcbFlags) & fcbResourceMask) {    // "pseudo" resource fork
                        WriteMacInt32(pb + ioMisc, 0);
                        return noErr;
                } else
                        return fnOpnErr;

        // Get file size
        struct stat st;
        if (fstat(fd, &st) < 0)
                return errno2oserr();

        // Adjust FCBs
        WriteMacInt32(fcb + fcbEOF, st.st_size);
        WriteMacInt32(fcb + fcbPLen, (st.st_size | (AL_BLK_SIZE - 1)) + 1);
        WriteMacInt32(pb + ioMisc, st.st_size);
        D(bug("  adjusting FCBs\n"));
        r.d[0] = ReadMacInt16(pb + ioRefNum);
        Execute68k(fs_data + fsAdjustEOF, &r);
        D(bug("  UTAdjustEOF() returned %d\n", r.d[0]));
        return noErr;
}

// Truncate file
static int16 fs_set_eof(uint32 pb)
{
        D(bug(" fs_set_eof(%08lx), refNum %d, size %d\n", pb, ReadMacInt16(pb + ioRefNum), ReadMacInt32(pb + ioMisc)));
        M68kRegisters r;

        // Find FCB and fd for file
        uint32 fcb = find_fcb(ReadMacInt16(pb + ioRefNum));
        if (fcb == 0)
                return rfNumErr;
        if (ReadMacInt32(fcb + fcbFlNm) == 0)
                return fnOpnErr;
        int fd = ReadMacInt32(fcb + fcbCatPos);
        if (fd < 0)
                if (ReadMacInt8(fcb + fcbFlags) & fcbResourceMask)      // "pseudo" resource fork
                        return noErr;
                else
                        return fnOpnErr;

        // Truncate file
        uint32 size = ReadMacInt32(pb + ioMisc);
        if (ftruncate(fd, size) < 0)
                return errno2oserr();

        // Adjust FCBs
        WriteMacInt32(fcb + fcbEOF, size);
        WriteMacInt32(fcb + fcbPLen, (size | (AL_BLK_SIZE - 1)) + 1);
        D(bug("  adjusting FCBs\n"));
        r.d[0] = ReadMacInt16(pb + ioRefNum);
        Execute68k(fs_data + fsAdjustEOF, &r);
        D(bug("  UTAdjustEOF() returned %d\n", r.d[0]));
        return noErr;
}

// Query current file position
static int16 fs_get_fpos(uint32 pb)
{
        D(bug(" fs_get_fpos(%08lx), refNum %d\n", pb, ReadMacInt16(pb + ioRefNum)));

        WriteMacInt32(pb + ioReqCount, 0);
        WriteMacInt32(pb + ioActCount, 0);
        WriteMacInt16(pb + ioPosMode, 0);

        // Find FCB and fd for file
        uint32 fcb = find_fcb(ReadMacInt16(pb + ioRefNum));
        if (fcb == 0)
                return rfNumErr;
        if (ReadMacInt32(fcb + fcbFlNm) == 0)
                return fnOpnErr;
        int fd = ReadMacInt32(fcb + fcbCatPos);
        if (fd < 0)
                if (ReadMacInt8(fcb + fcbFlags) & fcbResourceMask) {    // "pseudo" resource fork
                        WriteMacInt32(pb + ioPosOffset, 0);
                        return noErr;
                } else
                        return fnOpnErr;

        // Get file position
        uint32 pos = lseek(fd, 0, SEEK_CUR);
        WriteMacInt32(fcb + fcbCrPs, pos);
        WriteMacInt32(pb + ioPosOffset, pos);
        return noErr;
}

// Set current file position
static int16 fs_set_fpos(uint32 pb)
{
        D(bug(" fs_set_fpos(%08lx), refNum %d, posMode %d, offset %d\n", pb, ReadMacInt16(pb + ioRefNum), ReadMacInt16(pb + ioPosMode), ReadMacInt32(pb + ioPosOffset)));

        // Find FCB and fd for file
        uint32 fcb = find_fcb(ReadMacInt16(pb + ioRefNum));
        if (fcb == 0)
                return rfNumErr;
        if (ReadMacInt32(fcb + fcbFlNm) == 0)
                return fnOpnErr;
        int fd = ReadMacInt32(fcb + fcbCatPos);
        if (fd < 0)
                if (ReadMacInt8(fcb + fcbFlags) & fcbResourceMask) {    // "pseudo" resource fork
                        WriteMacInt32(pb + ioPosOffset, 0);
                        return noErr;
                } else
                        return fnOpnErr;

        // Set file position
        switch (ReadMacInt16(pb + ioPosMode) & 3) {
                case fsFromStart:
                        if (lseek(fd, ReadMacInt32(pb + ioPosOffset), SEEK_SET) < 0)
                                return posErr;
                        break;
                case fsFromLEOF:
                        if (lseek(fd, (int32)ReadMacInt32(pb + ioPosOffset), SEEK_END) < 0)
                                return posErr;
                        break;
                case fsFromMark:
                        if (lseek(fd, (int32)ReadMacInt32(pb + ioPosOffset), SEEK_CUR) < 0)
                                return posErr;
                        break;
                default:
                        break;
        }
        uint32 pos = lseek(fd, 0, SEEK_CUR);
        WriteMacInt32(fcb + fcbCrPs, pos);
        WriteMacInt32(pb + ioPosOffset, pos);
        return noErr;
}

// Read from file
static int16 fs_read(uint32 pb)
{
        D(bug(" fs_read(%08lx), refNum %d, buffer %p, count %d, posMode %d, posOffset %d\n", pb, ReadMacInt16(pb + ioRefNum), ReadMacInt32(pb + ioBuffer), ReadMacInt32(pb + ioReqCount), ReadMacInt16(pb + ioPosMode), ReadMacInt32(pb + ioPosOffset)));

        // Check parameters
        if ((int32)ReadMacInt32(pb + ioReqCount) < 0)
                return paramErr;

        // Find FCB and fd for file
        uint32 fcb = find_fcb(ReadMacInt16(pb + ioRefNum));
        if (fcb == 0)
                return rfNumErr;
        if (ReadMacInt32(fcb + fcbFlNm) == 0)
                return fnOpnErr;
        int fd = ReadMacInt32(fcb + fcbCatPos);
        if (fd < 0)
                if (ReadMacInt8(fcb + fcbFlags) & fcbResourceMask) {    // "pseudo" resource fork
                        WriteMacInt32(pb + ioActCount, 0);
                        return eofErr;
                } else
                        return fnOpnErr;

        // Seek
        switch (ReadMacInt16(pb + ioPosMode) & 3) {
                case fsFromStart:
                        if (lseek(fd, ReadMacInt32(pb + ioPosOffset), SEEK_SET) < 0)
                                return posErr;
                        break;
                case fsFromLEOF:
                        if (lseek(fd, (int32)ReadMacInt32(pb + ioPosOffset), SEEK_END) < 0)
                                return posErr;
                        break;
                case fsFromMark:
                        if (lseek(fd, (int32)ReadMacInt32(pb + ioPosOffset), SEEK_CUR) < 0)
                                return posErr;
                        break;
        }

        // Read
        ssize_t actual = extfs_read(fd, Mac2HostAddr(ReadMacInt32(pb + ioBuffer)), ReadMacInt32(pb + ioReqCount));
        int16 read_err = errno2oserr();
        D(bug("  actual %d\n", actual));
        WriteMacInt32(pb + ioActCount, actual >= 0 ? actual : 0);
        uint32 pos = lseek(fd, 0, SEEK_CUR);
        WriteMacInt32(fcb + fcbCrPs, pos);
        WriteMacInt32(pb + ioPosOffset, pos);
        if (actual != (ssize_t)ReadMacInt32(pb + ioReqCount))
                return actual < 0 ? read_err : eofErr;
        else
                return noErr;
}

// Write to file
static int16 fs_write(uint32 pb)
{
        D(bug(" fs_write(%08lx), refNum %d, buffer %p, count %d, posMode %d, posOffset %d\n", pb, ReadMacInt16(pb + ioRefNum), ReadMacInt32(pb + ioBuffer), ReadMacInt32(pb + ioReqCount), ReadMacInt16(pb + ioPosMode), ReadMacInt32(pb + ioPosOffset)));

        // Check parameters
        if ((int32)ReadMacInt32(pb + ioReqCount) < 0)
                return paramErr;

        // Find FCB and fd for file
        uint32 fcb = find_fcb(ReadMacInt16(pb + ioRefNum));
        if (fcb == 0)
                return rfNumErr;
        if (ReadMacInt32(fcb + fcbFlNm) == 0)
                return fnOpnErr;
        int fd = ReadMacInt32(fcb + fcbCatPos);
        if (fd < 0)
                if (ReadMacInt8(fcb + fcbFlags) & fcbResourceMask) {    // "pseudo" resource fork
                        WriteMacInt32(pb + ioActCount, ReadMacInt32(pb + ioReqCount));
                        return noErr;
                } else
                        return fnOpnErr;

        // Seek
        switch (ReadMacInt16(pb + ioPosMode) & 3) {
                case fsFromStart:
                        if (lseek(fd, ReadMacInt32(pb + ioPosOffset), SEEK_SET) < 0)
                                return posErr;
                        break;
                case fsFromLEOF:
                        if (lseek(fd, (int32)ReadMacInt32(pb + ioPosOffset), SEEK_END) < 0)
                                return posErr;
                        break;
                case fsFromMark:
                        if (lseek(fd, (int32)ReadMacInt32(pb + ioPosOffset), SEEK_CUR) < 0)
                                return posErr;
                        break;
        }

        // Write
        ssize_t actual = extfs_write(fd, Mac2HostAddr(ReadMacInt32(pb + ioBuffer)), ReadMacInt32(pb + ioReqCount));
        int16 write_err = errno2oserr();
        D(bug("  actual %d\n", actual));
        WriteMacInt32(pb + ioActCount, actual >= 0 ? actual : 0);
        uint32 pos = lseek(fd, 0, SEEK_CUR);
        WriteMacInt32(fcb + fcbCrPs, pos);
        WriteMacInt32(pb + ioPosOffset, pos);
        if (actual != (ssize_t)ReadMacInt32(pb + ioReqCount))
                return write_err;
        else
                return noErr;
}

// Create file
static int16 fs_create(uint32 pb, uint32 dirID)
{
        D(bug(" fs_create(%08lx), vRefNum %d, name %.31s, dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), dirID));

        // Find FSItem for given file
        FSItem *fs_item;
        int16 result = get_item_and_path(pb, dirID, fs_item);
        if (result != noErr)
                return result;

        // Does the file already exist?
        if (access(full_path, F_OK) == 0)
                return dupFNErr;

        // Create file
        int fd = creat(full_path, 0666);
        if (fd < 0)
                return errno2oserr();
        else {
                close(fd);
                return noErr;
        }
}

// Create directory
static int16 fs_dir_create(uint32 pb)
{
        D(bug(" fs_dir_create(%08lx), vRefNum %d, name %.31s, dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), ReadMacInt32(pb + ioDirID)));

        // Find FSItem for given directory
        FSItem *fs_item;
        int16 result = get_item_and_path(pb, ReadMacInt32(pb + ioDirID), fs_item);
        if (result != noErr)
                return result;

        // Does the directory already exist?
        if (access(full_path, F_OK) == 0)
                return dupFNErr;

        // Create directory
        if (mkdir(full_path, 0777) < 0)
                return errno2oserr();
        else {
                WriteMacInt32(pb + ioDirID, fs_item->id);
                return noErr;
        }
}

// Delete file/directory
static int16 fs_delete(uint32 pb, uint32 dirID)
{
        D(bug(" fs_delete(%08lx), vRefNum %d, name %.31s, dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), dirID));

        // Find FSItem for given file/dir
        FSItem *fs_item;
        int16 result = get_item_and_path(pb, dirID, fs_item);
        if (result != noErr)
                return result;

        // Delete file
        if (!extfs_remove(full_path))
                return errno2oserr();
        else
                return noErr;
}

// Rename file/directory
static int16 fs_rename(uint32 pb, uint32 dirID)
{
        D(bug(" fs_rename(%08lx), vRefNum %d, name %.31s, dirID %d, new name %.31s\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), dirID, Mac2HostAddr(ReadMacInt32(pb + ioMisc) + 1)));

        // Find path of given file/dir
        FSItem *fs_item;
        int16 result = get_item_and_path(pb, dirID, fs_item);
        if (result != noErr)
                return result;

        // Save path of existing item
        char old_path[MAX_PATH_LENGTH];
        strcpy(old_path, full_path);

        // Find path for new name
        Mac2Mac_memcpy(fs_data + fsPB, pb, SIZEOF_IOParam);
        WriteMacInt32(fs_data + fsPB + ioNamePtr, ReadMacInt32(pb + ioMisc));
        FSItem *new_item;
        result = get_item_and_path(fs_data + fsPB, dirID, new_item);
        if (result != noErr)
                return result;

        // Does the new name already exist?
        if (access(full_path, F_OK) == 0)
                return dupFNErr;

        // Rename item
        D(bug("  renaming %s -> %s\n", old_path, full_path));
        if (!extfs_rename(old_path, full_path))
                return errno2oserr();
        else {
                // The ID of the old file/dir has to stay the same, so we swap the IDs of the FSItems
                swap_parent_ids(fs_item->id, new_item->id);
                uint32 t = fs_item->id;
                fs_item->id = new_item->id;
                new_item->id = t;
                return noErr;
        }
}

// Move file/directory (CMovePBRec)
static int16 fs_cat_move(uint32 pb)
{
        D(bug(" fs_cat_move(%08lx), vRefNum %d, name %.31s, dirID %d, new name %.31s, new dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), ReadMacInt32(pb + ioDirID), Mac2HostAddr(ReadMacInt32(pb + ioNewName) + 1), ReadMacInt32(pb + ioNewDirID)));

        // Find path of given file/dir
        FSItem *fs_item;
        int16 result = get_item_and_path(pb, ReadMacInt32(pb + ioDirID), fs_item);
        if (result != noErr)
                return result;

        // Save path of existing item
        char old_path[MAX_PATH_LENGTH];
        strcpy(old_path, full_path);

        // Find path for new directory
        Mac2Mac_memcpy(fs_data + fsPB, pb, SIZEOF_IOParam);
        WriteMacInt32(fs_data + fsPB + ioNamePtr, ReadMacInt32(pb + ioNewName));
        FSItem *new_dir_item;
        result = get_item_and_path(fs_data + fsPB, ReadMacInt32(pb + ioNewDirID), new_dir_item);
        if (result != noErr)
                return result;

        // Append old file/dir name
        add_path_comp(fs_item->name);

        // Does the new name already exist?
        if (access(full_path, F_OK) == 0)
                return dupFNErr;

        // Move item
        D(bug("  moving %s -> %s\n", old_path, full_path));
        if (!extfs_rename(old_path, full_path))
                return errno2oserr();
        else {
                // The ID of the old file/dir has to stay the same, so we swap the IDs of the FSItems
                FSItem *new_item = find_fsitem(fs_item->name, new_dir_item);
                if (new_item) {
                        swap_parent_ids(fs_item->id, new_item->id);
                        uint32 t = fs_item->id;
                        fs_item->id = new_item->id;
                        new_item->id = t;
                }
                return noErr;
        }
}

// Open working directory (WDParam)
static int16 fs_open_wd(uint32 pb)
{
        D(bug(" fs_open_wd(%08lx), vRefNum %d, name %.31s, dirID %d\n", pb, ReadMacInt16(pb + ioVRefNum), Mac2HostAddr(ReadMacInt32(pb + ioNamePtr) + 1), ReadMacInt32(pb + ioWDDirID)));
        M68kRegisters r;

        // Allocate WDCB
        D(bug("  allocating WDCB\n"));
        r.a[0] = pb;
        Execute68k(fs_data + fsAllocateWDCB, &r);
        D(bug("  UTAllocateWDCB returned %d, refNum is %d\n", r.d[0], ReadMacInt16(pb + ioVRefNum)));
        return (int16)r.d[0];
}

// Close working directory (WDParam)
static int16 fs_close_wd(uint32 pb)
{
        D(bug(" fs_close_wd(%08lx), vRefNum %d\n", pb, ReadMacInt16(pb + ioVRefNum)));
        M68kRegisters r;

        // Release WDCB
        D(bug("  releasing WDCB\n"));
        r.d[0] = ReadMacInt16(pb + ioVRefNum);
        Execute68k(fs_data + fsReleaseWDCB, &r);
        D(bug("  UTReleaseWDCB returned %d\n", r.d[0]));
        return (int16)r.d[0];
}

// Query information about working directory (WDParam)
static int16 fs_get_wd_info(uint32 pb, uint32 vcb)
{
        D(bug(" fs_get_wd_info(%08lx), vRefNum %d, idx %d, procID %d\n", pb, ReadMacInt16(pb + ioVRefNum), ReadMacInt16(pb + ioWDIndex), ReadMacInt32(pb + ioWDProcID)));
        M68kRegisters r;

        // Querying volume?
        if (ReadMacInt16(pb + ioWDIndex) == 0 && ReadMacInt16(pb + ioVRefNum) == ReadMacInt16(vcb + vcbVRefNum)) {
                WriteMacInt32(pb + ioWDProcID, 0);
                WriteMacInt16(pb + ioWDVRefNum, ReadMacInt16(vcb + vcbVRefNum));
                if (ReadMacInt32(pb + ioNamePtr))
                        Mac2Mac_memcpy(ReadMacInt32(pb + ioNamePtr), vcb + vcbVN, 28);
                WriteMacInt32(pb + ioWDDirID, ROOT_ID);
                return noErr;
        }

        // Resolve WDCB
        D(bug("  resolving WDCB\n"));
        r.d[0] = ReadMacInt32(pb + ioWDProcID);
        r.d[1] = ReadMacInt16(pb + ioWDIndex);
        r.d[2] = ReadMacInt16(pb + ioVRefNum);
        r.a[0] = fs_data + fsReturn;
        Execute68k(fs_data + fsResolveWDCB, &r);
        uint32 wdcb = ReadMacInt32(fs_data + fsReturn);
        D(bug("  UTResolveWDCB() returned %d, dirID %d\n", r.d[0], ReadMacInt32(wdcb + wdDirID)));
        if (r.d[0] & 0xffff)
                return (int16)r.d[0];

        // Return information
        WriteMacInt32(pb + ioWDProcID, ReadMacInt32(wdcb + wdProcID));
        WriteMacInt16(pb + ioWDVRefNum, ReadMacInt16(ReadMacInt32(wdcb + wdVCBPtr) + vcbVRefNum));
        if (ReadMacInt32(pb + ioNamePtr))
                Mac2Mac_memcpy(ReadMacInt32(pb + ioNamePtr), ReadMacInt32(wdcb + wdVCBPtr) + vcbVN, 28);
        WriteMacInt32(pb + ioWDDirID, ReadMacInt32(wdcb + wdDirID));
        return noErr;
}

// Main dispatch routine
int16 ExtFSHFS(uint32 vcb, uint16 selectCode, uint32 paramBlock, uint32 globalsPtr, int16 fsid)
{
        uint16 trapWord = selectCode & 0xf0ff;
        bool hfs = selectCode & kHFSMask;
        switch (trapWord) {
                case kFSMOpen:
                        return fs_open(paramBlock, hfs ? ReadMacInt32(paramBlock + ioDirID) : 0, vcb, false);

                case kFSMClose:
                        return fs_close(paramBlock);

                case kFSMRead:
                        return fs_read(paramBlock);

                case kFSMWrite:
                        return fs_write(paramBlock);

                case kFSMGetVolInfo:
                        return fs_get_vol_info(paramBlock, hfs);

                case kFSMCreate:
                        return fs_create(paramBlock, hfs ? ReadMacInt32(paramBlock + ioDirID) : 0);

                case kFSMDelete:
                        return fs_delete(paramBlock, hfs ? ReadMacInt32(paramBlock + ioDirID) : 0);

                case kFSMOpenRF:
                        return fs_open(paramBlock, hfs ? ReadMacInt32(paramBlock + ioDirID) : 0, vcb, true);

                case kFSMRename:
                        return fs_rename(paramBlock, hfs ? ReadMacInt32(paramBlock + ioDirID) : 0);

                case kFSMGetFileInfo:
                        return fs_get_file_info(paramBlock, hfs, hfs ? ReadMacInt32(paramBlock + ioDirID) : 0);

                case kFSMSetFileInfo:
                        return fs_set_file_info(paramBlock, hfs, hfs ? ReadMacInt32(paramBlock + ioDirID) : 0);

                case kFSMUnmountVol:
                        return fs_unmount_vol(vcb);

                case kFSMMountVol:
                        return fs_mount_vol(paramBlock);

                case kFSMAllocate:
                        D(bug(" allocate\n"));
                        WriteMacInt32(paramBlock + ioActCount, ReadMacInt32(paramBlock + ioReqCount));
                        return noErr;

                case kFSMGetEOF:
                        return fs_get_eof(paramBlock);

                case kFSMSetEOF:
                        return fs_set_eof(paramBlock);

                case kFSMGetVol:
                        return fs_get_vol(paramBlock);

                case kFSMSetVol:
                        return fs_set_vol(paramBlock, hfs, vcb);

                case kFSMEject:
                        D(bug(" eject\n"));
                        return noErr;

                case kFSMGetFPos:
                        return fs_get_fpos(paramBlock);

                case kFSMOffline:
                        D(bug(" offline\n"));
                        return noErr;

                case kFSMSetFilLock:
                        return noErr;   //!!

                case kFSMRstFilLock:
                        return noErr;   //!!

                case kFSMSetFPos:
                        return fs_set_fpos(paramBlock);

                case kFSMOpenWD:
                        return fs_open_wd(paramBlock);

                case kFSMCloseWD:
                        return fs_close_wd(paramBlock);

                case kFSMCatMove:
                        return fs_cat_move(paramBlock);

                case kFSMDirCreate:
                        return fs_dir_create(paramBlock);

                case kFSMGetWDInfo:
                        return fs_get_wd_info(paramBlock, vcb);

                case kFSMGetFCBInfo:
                        return fs_get_fcb_info(paramBlock, vcb);

                case kFSMGetCatInfo:
                        return fs_get_cat_info(paramBlock);

                case kFSMSetCatInfo:
                        return fs_set_cat_info(paramBlock);

                case kFSMSetVolInfo:
                        return fs_set_vol_info(paramBlock);

                case kFSMGetVolParms:
                        return fs_get_vol_parms(paramBlock);

                case kFSMVolumeMount:
                        return fs_volume_mount(paramBlock);

                case kFSMFlushVol:
                case kFSMFlushFile:
                        D(bug(" flush_vol/flush_file\n"));
                        return noErr;

                default:
                        D(bug("ExtFSHFS(%08lx, %04x, %08lx, %08lx, %d)\n", vcb, selectCode, paramBlock, globalsPtr, fsid));
                        return paramErr;
        }
}
Revision:	1.36
Committed:	2008-06-20T00:39:47Z (16 years, 4 months ago) by asvitkine
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.35:	+1 -1 lines
Log Message:	[patch from Kelvin Delbarre] Fix file corruption experienced when doing random-access file I/O to the external filesystem. The application-specified ioPosMode parameter must be masked off appropriately in extfs.cpp:fs_set_fpos(), as is done elsewhere in the file.