kolibrios/kernel/branches/Kolibri-acpi/fs/ntfs.inc

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;                                                              ;;
;; Copyright (C) KolibriOS team 2004-2016. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License    ;;
;;                                                              ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

$Revision$

; NTFS driver

; Basic concepts:
; File is a FileRecord in the $MFT.
; $MFT is a file, that consists of FileRecords and starts with FileRecord of itself.
; FileRecord (FILE) consists of a header and attributes.
; Attribute consists of a header and a body.
; Attribute's body can be inside (resident) or outside of FileRecord.
; File's data is a body of $Data (80h) attribute.
; FileRecords is a data of the $MFT file.
; Directory is a file, that consists of index nodes.
; Resident index node is always located in a body of $IndexRoot (90h) attribute.
; Body of $IndexAllocation (A0h) attribute is always non resident
;  and consists of IndexRecords.
; IndexRecord (INDX) consists of a header and an index node.
; Index node consists of a header and indexes.
; Index consists of a header and a copy of indexed attribute's body.
; Directories index $Filename (30h) attribute of all existing files.
; $IndexRoot and $IndexAllocation attributes of a directory has a name — $I30.

; Offsets:
    ; record header
magic = 0
updateSequenceOffset = 4
updateSequenceSize = 6
    ; FileRecord header
reuseCounter = 16
hardLinkCounter = 12h
attributeOffset = 14h
recordFlags = 16h
recordRealSize = 18h
recordAllocatedSize = 1ch
baseRecordReference = 20h       ; for auxiliary records
baseRecordReuse = 26h
newAttributeID = 28h
    ; attribute header
attributeType = 0
sizeWithHeader = 4
nonResidentFlag = 8
nameLength = 9
nameOffset = 10
attributeFlags = 12
attributeID = 14
    ; resident attribute header
sizeWithoutHeader = 10h
attributeOffset = 14h
indexedFlag = 16h
    ; non resident attribute header
firstVCN = 10h
lastVCN = 18h
dataRunsOffset = 20h
attributeAllocatedSize = 28h
attributeRealSize = 30h
initialDataSize = 38h
    ; $IndexRoot
indexedAttributesType = 0
collationRule = 4
indexRecordSize = 8
indexRecordSizeClus = 12
rootNode = 16
    ; IndexRecord header
recordVCN = 16
recordNode = 18h
    ; node header
indexOffset = 0
nodeRealSize = 4
nodeAllocatedSize = 8
nonLeafFlag = 12
    ; $Filename index
fileRecordReference = 0
fileReferenceReuse = 6
indexAllocatedSize = 8
indexRawSize = 10
indexFlags = 12
directoryRecordReference = 16
directoryReferenceReuse = 16h
fileCreated = 18h
fileModified = 20h
recordModified = 28h
fileAccessed = 30h
fileAllocatedSize = 38h
fileRealSize = 40h
fileFlags = 48h
fileNameLength = 50h
namespace = 51h
fileName = 52h

struct NTFS PARTITION
Lock                MUTEX   ?   ; Currently operations with one partition
; can not be executed in parallel since the legacy code is not ready.
sectors_per_cluster     dd  ?
mft_cluster             dd  ?   ; location
mftmirr_cluster         dd  ?   ; location
frs_size                dd  ?   ; in bytes
frs_buffer              dd  ?   ; MFT fileRecord buffer
mft_retrieval           dd  ?
mft_retrieval_size      dd  ?
mft_retrieval_alloc     dd  ?
mft_retrieval_end       dd  ?
cur_index_size          dd  ?   ; in sectors
cur_index_buf           dd  ?   ; index node buffer
BitmapBuffer            dd  ?
BitmapTotalSize         dd  ?   ; bytes reserved
BitmapSize              dd  ?   ; bytes readen
BitmapLocation          dd  ?   ; starting sector
BitmapStart             dd  ?   ; first byte after area, reserved for MFT
mftBitmapBuffer         dd  ?   ; one cluster
mftBitmapSize           dd  ?   ; bytes readen
mftBitmapLocation       dd  ?   ; starting sector

cur_attr            dd  ?   ; attribute type
cur_iRecord         dd  ?   ; number of fileRecord in MFT
cur_offs            dd  ?   ; attribute VCN in sectors
cur_size            dd  ?   ; max sectors to read
cur_buf             dd  ?
cur_read            dd  ?   ; bytes readen
LastRead            dd  ?   ; last readen block of sectors
newMftRecord            dd  ?   ; number of fileRecord in MFT
fileDataStart           dd  ?   ; starting cluster
fileDataSize            dd  ?   ; in clusters
fileDataBuffer      dd  ?
fileRealSize            dd  ?   ; in bytes
indexOffset             dd  ?
nodeLastRead            dd  ?
fragmentCount       db  ?
bCanContinue        db  ?
bFolder             db  ?
bWriteAttr          db  ?   ; Warning: Don't forget to turn off!!!

cur_subnode_size        dd  ?
attr_iRecord        dd  ?
attr_iBaseRecord    dd  ?
attr_offs           dd  ?
attr_list           dd  ?
attr_size           dq  ?
cur_tail            dd  ?

attrlist_buf        rb  0x400
attrlist_mft_buf    rb  0x400
bitmap_buf          rb  0x400
ends

; NTFS external functions
;   in:
; ebx -> parameter structure of sysfunc 70
; ebp -> NTFS structure
; [esi]+[esp+4] = name
;   out:
; eax, ebx = return values for sysfunc 70
iglobal
align 4
ntfs_user_functions:
        dd      ntfs_free
        dd      (ntfs_user_functions_end - ntfs_user_functions - 4) / 4
        dd      ntfs_ReadFile
        dd      ntfs_ReadFolder
        dd      ntfs_CreateFile
        dd      ntfs_WriteFile
        dd      ntfs_SetFileEnd
        dd      ntfs_GetFileInfo
        dd      ntfs_SetFileInfo
        dd      0
        dd      ntfs_Delete
        dd      ntfs_CreateFolder
ntfs_user_functions_end:
endg

ntfs_test_bootsec:
; in: ebx -> buffer, edx = size of partition
; out: CF=1 -> invalid
; 1. Name=='NTFS    '
        cmp     dword [ebx+3], 'NTFS'
        jnz     .no
        cmp     dword [ebx+7], '    '
        jnz     .no
; 2. Number of bytes per sector is the same as for physical device
; (that is, 0x200 for hard disk)
        cmp     word [ebx+11], 0x200
        jnz     .no
; 3. Number of sectors per cluster must be power of 2
        movzx   eax, byte [ebx+13]
        dec     eax
        js      .no
        test    al, [ebx+13]
        jnz     .no
; 4. FAT parameters must be zero
        cmp     word [ebx+14], 0
        jnz     .no
        cmp     dword [ebx+16], 0
        jnz     .no
        cmp     byte [ebx+20], 0
        jnz     .no
        cmp     word [ebx+22], 0
        jnz     .no
        cmp     dword [ebx+32], 0
        jnz     .no
; 5. Number of sectors <= partition size
        cmp     dword [ebx+0x2C], 0
        ja      .no
        cmp     [ebx+0x28], edx
        ja      .no
; 6. $MFT and $MFTMirr clusters must be within partition
        cmp     dword [ebx+0x34], 0
        ja      .no
        push    edx
        movzx   eax, byte [ebx+13]
        mul     dword [ebx+0x30]
        test    edx, edx
        pop     edx
        jnz     .no
        cmp     eax, edx
        ja      .no
        cmp     dword [ebx+0x3C], 0
        ja      .no
        push    edx
        movzx   eax, byte [ebx+13]
        mul     dword [ebx+0x38]
        test    edx, edx
        pop     edx
        jnz     .no
        cmp     eax, edx
        ja      .no
; 7. Clusters per FRS must be either power of 2 or between -31 and -9
        movsx   eax, byte [ebx+0x40]
        cmp     al, -31
        jl      .no
        cmp     al, -9
        jle     @f
        dec     eax
        js      .no
        test    [ebx+0x40], al
        jnz     .no
@@:         ; 8. Same for clusters per IndexAllocationBuffer
        movsx   eax, byte [ebx+0x44]
        cmp     al, -31
        jl      .no
        cmp     al, -9
        jle     @f
        dec     eax
        js      .no
        test    [ebx+0x44], al
        jnz     .no
@@:         ; OK, this is correct NTFS bootsector
        clc
        ret
.no:        ; No, this bootsector isn't NTFS
        stc
        ret

ntfs_create_partition:
        cmp     dword [esi+DISK.MediaInfo.SectorSize], 512
        jnz     .nope
        mov     edx, dword [ebp+PARTITION.Length]
        cmp     dword [esp+4], 0
        jz      .boot_read_ok
        add     ebx, 512
        lea     eax, [edx-1]
        call    fs_read32_sys
        test    eax, eax
        jnz     @f
        call    ntfs_test_bootsec
        jnc     .ntfs_setup
@@:
        mov     eax, edx
        shr     eax, 1
        call    fs_read32_sys
        test    eax, eax
        jnz     .nope
.boot_read_ok:
        call    ntfs_test_bootsec
        jnc     .ntfs_setup
.nope:
        xor     eax, eax
        jmp     .exit

; By given bootsector, initialize some NTFS variables
.ntfs_setup:
        movi    eax, sizeof.NTFS
        call    malloc
        test    eax, eax
        jz      .exit
        mov     ecx, dword [ebp+PARTITION.FirstSector]
        mov     dword [eax+NTFS.FirstSector], ecx
        mov     ecx, dword [ebp+PARTITION.FirstSector+4]
        mov     dword [eax+NTFS.FirstSector+4], ecx
        mov     ecx, [ebp+PARTITION.Disk]
        mov     [eax+NTFS.Disk], ecx
        mov     [eax+NTFS.FSUserFunctions], ntfs_user_functions
        mov     [eax+NTFS.bWriteAttr], 0

        push    ebx ebp esi
        mov     ebp, eax
        lea     ecx, [ebp+NTFS.Lock]
        call    mutex_init
        movzx   eax, byte [ebx+13]
        mov     [ebp+NTFS.sectors_per_cluster], eax
        mov     eax, [ebx+0x28]
        mov     dword [ebp+NTFS.Length], eax
        and     dword [ebp+NTFS.Length+4], 0
        mov     eax, [ebx+0x30]
        mov     [ebp+NTFS.mft_cluster], eax
        mov     eax, [ebx+0x38]
        mov     [ebp+NTFS.mftmirr_cluster], eax
        movsx   eax, byte [ebx+0x40]
        test    eax, eax
        js      @f
        mul     [ebp+NTFS.sectors_per_cluster]
        shl     eax, 9
        jmp     .1

@@:
        neg     eax
        mov     ecx, eax
        mov     eax, 1
        shl     eax, cl
.1:
        mov     [ebp+NTFS.frs_size], eax
        stdcall kernel_alloc, eax
        test    eax, eax
        jz      .fail_free
        mov     [ebp+NTFS.frs_buffer], eax
; read $MFT disposition
        mov     eax, [ebp+NTFS.mft_cluster]
        mul     [ebp+NTFS.sectors_per_cluster]
        call    ntfs_read_frs_sector
        test    eax, eax
        jnz     .usemirr
        cmp     dword [ebx], 'FILE'
        jnz     .usemirr
        call    ntfs_restore_usa_frs
        jnc     .mftok
.usemirr:
        mov     eax, [ebp+NTFS.mftmirr_cluster]
        mul     [ebp+NTFS.sectors_per_cluster]
        call    ntfs_read_frs_sector
        test    eax, eax
        jnz     .fail_free_frs
        cmp     dword [ebx], 'FILE'
        jnz     .fail_free_frs
        call    ntfs_restore_usa_frs
        jc      .fail_free_frs
.mftok:
; read $MFT table retrieval information
; start with one page, increase if not enough (when MFT too fragmented)
        push    ebx
        stdcall kernel_alloc, 0x1000
        pop     ebx
        test    eax, eax
        jz      .fail_free_frs
        mov     [ebp+NTFS.mft_retrieval], eax
        and     [ebp+NTFS.mft_retrieval_size], 0
        mov     [ebp+NTFS.mft_retrieval_alloc], 0x1000/8
; $MFT base record must contain unnamed non-resident $DATA attribute
        movzx   eax, word [ebx+14h]
        add     eax, ebx
.scandata:
        cmp     dword [eax], -1
        jz      .fail_free_mft
        cmp     dword [eax], 0x80
        jnz     @f
        cmp     byte [eax+9], 0
        jz      .founddata
@@:
        add     eax, [eax+4]
        jmp     .scandata

.founddata:
        cmp     byte [eax+8], 0
        jz      .fail_free_mft
; load first portion of $DATA attribute retrieval information
        mov     edx, [eax+0x18]
        mov     [ebp+NTFS.mft_retrieval_end], edx
        mov     esi, eax
        movzx   eax, word [eax+0x20]
        add     esi, eax
        sub     esp, 10h
.scanmcb:
        call    ntfs_decode_mcb_entry
        jnc     .scanmcbend
        call    .get_mft_retrieval_ptr
        mov     edx, [esp]      ; block length
        mov     [eax], edx
        mov     edx, [esp+8]    ; block addr (relative)
        mov     [eax+4], edx
        inc     [ebp+NTFS.mft_retrieval_size]
        jmp     .scanmcb

.scanmcbend:
        add     esp, 10h
; there may be other portions of $DATA attribute in auxiliary records;
; if they will be needed, they will be loaded later
        mov     [ebp+NTFS.cur_index_size], 0x1000/0x200
        stdcall kernel_alloc, 0x1000
        test    eax, eax
        jz      .fail_free_mft
        mov     [ebp+NTFS.cur_index_buf], eax
; reserve adress space for bitmap buffer and load some part of bitmap
        mov     eax, dword [ebp+NTFS.Length]
        xor     edx, edx
        div     [ebp+NTFS.sectors_per_cluster]
        shr     eax, 3
        mov     [ebp+NTFS.BitmapTotalSize], eax
        add     eax, 7FFFh
        and     eax, not 7FFFh
        push    eax
        call    alloc_kernel_space
        test    eax, eax
        jz      .failFreeIndex
        mov     [ebp+NTFS.BitmapBuffer], eax
        mov     [ebp+NTFS.cur_buf], eax
        mov     eax, [ebp+NTFS.BitmapTotalSize]
        add     eax, [ebp+NTFS.mft_cluster]
        shr     eax, 3+2        ; reserve 1/8 of partition for $MFT
        shl     eax, 2
        mov     [ebp+NTFS.BitmapStart], eax
        shr     eax, 15
        inc     eax
        shl     eax, 3
        push    eax
        push    eax
        shl     eax, 3
        mov     [ebp+NTFS.cur_size], eax
        call    alloc_pages
        test    eax, eax
        pop     ecx
        jz      .failFreeBitmap
        add     eax, 3
        mov     ebx, [ebp+NTFS.BitmapBuffer]
        call    commit_pages
        mov     [ebp+NTFS.cur_iRecord], 6
        mov     [ebp+NTFS.cur_attr], 0x80
        mov     [ebp+NTFS.cur_offs], 0
        call    ntfs_read_attr
        jc      .failFreeBitmap
        mov     eax, [ebp+NTFS.cur_read]
        mov     [ebp+NTFS.BitmapSize], eax
        mov     eax, [ebp+NTFS.LastRead]
        mov     [ebp+NTFS.BitmapLocation], eax
; read MFT $BITMAP attribute
        mov     eax, [ebp+NTFS.sectors_per_cluster]
        mov     [ebp+NTFS.cur_size], eax
        shl     eax, 9
        stdcall kernel_alloc, eax
        test    eax, eax
        jz      .failFreeBitmap
        mov     [ebp+NTFS.mftBitmapBuffer], eax
        mov     [ebp+NTFS.cur_buf], eax
        mov     [ebp+NTFS.cur_iRecord], 0
        mov     [ebp+NTFS.cur_attr], 0xB0
        mov     [ebp+NTFS.cur_offs], 0
        call    ntfs_read_attr
        mov     eax, [ebp+NTFS.cur_read]
        cmp     eax, 4
        jc      .failFreeBitmapMFT
        mov     ecx, [ebp+NTFS.attr_offs]
        cmp     byte [ecx+nonResidentFlag], 1
        jnz     .failFreeBitmapMFT
        mov     [ebp+NTFS.mftBitmapSize], eax
        mov     eax, [ebp+NTFS.LastRead]
        mov     [ebp+NTFS.mftBitmapLocation], eax

        mov     eax, ebp
.pop_exit:
        pop     esi ebp ebx
.exit:
        cmp     dword [esp+4], 0
        jz      @f
        sub     ebx, 512
@@:
        ret

.failFreeBitmapMFT:
        stdcall kernel_free, [ebx+NTFS.mftBitmapBuffer]
.failFreeBitmap:
        stdcall kernel_free, [ebx+NTFS.BitmapBuffer]
.failFreeIndex:
        stdcall kernel_free, [ebp+NTFS.cur_index_buf]
.fail_free_mft:
        stdcall kernel_free, [ebp+NTFS.mft_retrieval]
.fail_free_frs:
        stdcall kernel_free, [ebp+NTFS.frs_buffer]
.fail_free:
        mov     eax, ebp
        call    free
        xor     eax, eax
        jmp     .pop_exit

.get_mft_retrieval_ptr:
        pushad
        mov     eax, [ebp+NTFS.mft_retrieval_size]
        cmp     eax, [ebp+NTFS.mft_retrieval_alloc]
        jnz     .ok
        add     eax, 0x1000/8
        mov     [ebp+NTFS.mft_retrieval_alloc], eax
        shl     eax, 3
        stdcall kernel_alloc, eax
        test    eax, eax
        jnz     @f
        popad
        add     esp, 14h
        jmp     .fail_free_mft

@@:
        mov     esi, [ebp+NTFS.mft_retrieval]
        mov     edi, eax
        mov     ecx, [ebp+NTFS.mft_retrieval_size]
        add     ecx, ecx
        rep movsd
        push    [ebp+NTFS.mft_retrieval]
        mov     [ebp+NTFS.mft_retrieval], eax
        call    kernel_free
        mov     eax, [ebp+NTFS.mft_retrieval_size]
.ok:
        shl     eax, 3
        add     eax, [ebp+NTFS.mft_retrieval]
        mov     [esp+28], eax
        popad
        ret

ntfs_free:
        push    ebx
        mov     ebx, eax
        stdcall kernel_free, [ebx+NTFS.frs_buffer]
        stdcall kernel_free, [ebx+NTFS.mft_retrieval]
        stdcall kernel_free, [ebx+NTFS.cur_index_buf]
        stdcall kernel_free, [ebx+NTFS.mftBitmapBuffer]
        stdcall kernel_free, [ebx+NTFS.BitmapBuffer]
        mov     eax, ebx
        pop     ebx
        jmp     free

ntfs_lock:
        lea     ecx, [ebp+NTFS.Lock]
        jmp     mutex_lock

ntfs_unlock:
        lea     ecx, [ebp+NTFS.Lock]
        jmp     mutex_unlock

ntfs_read_frs_sector:
        push    ecx
        mov     ebx, [ebp+NTFS.frs_buffer]
        push    ebx
        mov     ecx, [ebp+NTFS.frs_size]
        shr     ecx, 9
        push    ecx
        mov     ecx, eax
@@:
        mov     eax, ecx
        call    fs_read32_sys
        test    eax, eax
        jnz     .fail
        add     ebx, 0x200
        inc     ecx
        dec     dword [esp]
        jnz     @b
        pop     eax
.fail:
        pop     ebx
        pop     ecx
        ret

ntfs_read_attr:
; [ebp+NTFS.bWriteAttr]=1 -> write attribute
;   in:
; [ebp+NTFS.cur_iRecord] = number of fileRecord
; [ebp+NTFS.cur_attr] = attribute type
; [ebp+NTFS.cur_offs] = attribute VCN in sectors
; [ebp+NTFS.cur_buf] -> buffer for data
; [ebp+NTFS.cur_size] = max sectors to read
;   out:
; [ebp+NTFS.cur_read] = bytes readen
; CF=1 -> failed, eax = disk error code, eax=0 -> something with FS
        xor     eax, eax
        pushad
        and     [ebp+NTFS.cur_read], 0
        cmp     [ebp+NTFS.cur_iRecord], 0
        jnz     .nomft
        cmp     [ebp+NTFS.cur_attr], 0x80
        jnz     .nomft
        mov     eax, [ebp+NTFS.mft_retrieval_end]
        inc     eax
        mul     [ebp+NTFS.sectors_per_cluster]
        cmp     eax, [ebp+NTFS.cur_offs]
        jbe     .nomft
; precalculated part of $Mft $DATA
        mov     esi, [ebp+NTFS.mft_retrieval]
        mov     eax, [ebp+NTFS.cur_offs]
        xor     edx, edx
        div     [ebp+NTFS.sectors_per_cluster]
; eax = VCN, edx = offset in sectors from beginning of cluster
        xor     ecx, ecx        ; ecx will contain LCN
.mftscan:
        add     ecx, [esi+4]
        sub     eax, [esi]
        jb      @f
        add     esi, 8
        push    eax
        mov     eax, [ebp+NTFS.mft_retrieval_end]
        shl     eax, 3
        add     eax, [ebp+NTFS.mft_retrieval]
        cmp     eax, esi
        pop     eax
        jnz     .mftscan
        jmp     .nomft

@@:
        push    ecx
        add     ecx, eax
        add     ecx, [esi]
        push    eax
        push    edx
        mov     eax, [ebp+NTFS.sectors_per_cluster]
        mul     ecx
; eax = sector on partition
        pop     edx
        add     eax, edx
        mov     ebx, [ebp+NTFS.cur_buf]
        pop     ecx
        neg     ecx
        imul    ecx, [ebp+NTFS.sectors_per_cluster]
        sub     ecx, edx
        mov     [ebp+NTFS.LastRead], eax
        cmp     ecx, [ebp+NTFS.cur_size]
        jb      @f
        mov     ecx, [ebp+NTFS.cur_size]
@@:
; ecx = number of sequential sectors to read
        push    eax
        call    fs_read32_sys
        pop     edx
        test    eax, eax
        jnz     .errread
        add     [ebp+NTFS.cur_read], 0x200
        dec     [ebp+NTFS.cur_size]
        inc     [ebp+NTFS.cur_offs]
        add     ebx, 0x200
        mov     [ebp+NTFS.cur_buf], ebx
        lea     eax, [edx+1]
        loop    @b
        pop     ecx
        xor     eax, eax
        xor     edx, edx
        cmp     [ebp+NTFS.cur_size], eax
        jz      @f
        add     esi, 8
        push    eax
        mov     eax, [ebp+NTFS.mft_retrieval_end]
        shl     eax, 3
        add     eax, [ebp+NTFS.mft_retrieval]
        cmp     eax, esi
        pop     eax
        jz      .nomft
        jmp     .mftscan

.errret2_pop:
        xor     eax, eax
.errret_pop:
        pop     ecx
.errread:
        pop     ecx
.errret:
        mov     [esp+28], eax
        stc
@@:
        popad
        ret

.nomft:
; 1. Read file record.
; N.B. This will do recursive call of read_attr for $MFT::$Data.
        mov     eax, [ebp+NTFS.cur_iRecord]
        mov     [ebp+NTFS.attr_iRecord], eax
        and     [ebp+NTFS.attr_list], 0
        or      dword [ebp+NTFS.attr_size], -1
        or      dword [ebp+NTFS.attr_size+4], -1
        or      [ebp+NTFS.attr_iBaseRecord], -1
        call    ntfs_read_file_record
        jc      .errret
; 2. Find required attribute.
        mov     eax, [ebp+NTFS.frs_buffer]
; a) For auxiliary records, read base record.
; If base record is present, base iRecord may be 0 (for $Mft),
; but SequenceNumber is nonzero.
        cmp     word [eax+baseRecordReuse], 0
        jz      @f
        mov     eax, [eax+baseRecordReference]
.beginfindattr:
        mov     [ebp+NTFS.attr_iRecord], eax
        call    ntfs_read_file_record
        jc      .errret
        jmp     @f

.newAttribute:
        pushad
        and     [ebp+NTFS.cur_read], 0
@@:
; b) Scan for required attribute and for $ATTR_LIST
        mov     eax, [ebp+NTFS.frs_buffer]
        movzx   ecx, word [eax+attributeOffset]
        add     eax, ecx
        mov     ecx, [ebp+NTFS.cur_attr]
        and     [ebp+NTFS.attr_offs], 0
.scanattr:
        cmp     dword [eax], -1
        jz      .scandone
        cmp     dword [eax], ecx
        jz      .okattr
        cmp     [ebp+NTFS.attr_iBaseRecord], -1
        jnz     .scancont
        cmp     dword [eax], 0x20       ; $ATTR_LIST
        jnz     .scancont
        mov     [ebp+NTFS.attr_list], eax
        jmp     .scancont

.okattr:
; ignore named $DATA attributes (aka NTFS streams)
        cmp     ecx, 0x80
        jnz     @f
        cmp     byte [eax+nameLength], 0
        jnz     .scancont
@@:
        mov     [ebp+NTFS.attr_offs], eax
.scancont:
        add     eax, [eax+sizeWithHeader]
        jmp     .scanattr

.continue:
        pushad
        and     [ebp+NTFS.cur_read], 0
.scandone:
; c) Check for required offset and length
        mov     ecx, [ebp+NTFS.attr_offs]
        jecxz   .noattr
        push    [ebp+NTFS.cur_size]
        push    [ebp+NTFS.cur_read]
        call    .doreadattr
        pop     edx
        pop     ecx
        jc      .ret
        cmp     [ebp+NTFS.bCanContinue], 0
        jz      .ret
        sub     edx, [ebp+NTFS.cur_read]
        neg     edx
        shr     edx, 9
        sub     ecx, edx
        mov     [ebp+NTFS.cur_size], ecx
        jz      .ret
.noattr:
        cmp     [ebp+NTFS.cur_attr], 0x20
        jz      @f
        mov     ecx, [ebp+NTFS.attr_list]
        test    ecx, ecx
        jnz     .lookattr
.ret_is_attr:
        and     dword [esp+28], 0
        cmp     [ebp+NTFS.attr_offs], 1     ; define CF
.ret:
        popad
        ret

.lookattr:
; required attribute or required offset was not found in base record;
; it may be present in auxiliary records;
; scan $ATTR_LIST
        mov     eax, [ebp+NTFS.attr_iBaseRecord]
        cmp     eax, -1
        jz      @f
        call    ntfs_read_file_record
        jc      .errret
        or      [ebp+NTFS.attr_iBaseRecord], -1
@@:
        push    [ebp+NTFS.cur_offs]
        push    [ebp+NTFS.cur_size]
        push    [ebp+NTFS.cur_read]
        push    [ebp+NTFS.cur_buf]
        push    dword [ebp+NTFS.attr_size]
        push    dword [ebp+NTFS.attr_size+4]
        or      dword [ebp+NTFS.attr_size], -1
        or      dword [ebp+NTFS.attr_size+4], -1
        and     [ebp+NTFS.cur_offs], 0
        mov     [ebp+NTFS.cur_size], 2
        and     [ebp+NTFS.cur_read], 0
        lea     eax, [ebp+NTFS.attrlist_buf]
        cmp     [ebp+NTFS.cur_iRecord], 0
        jnz     @f
        lea     eax, [ebp+NTFS.attrlist_mft_buf]
@@:
        mov     [ebp+NTFS.cur_buf], eax
        push    eax
        call    .doreadattr
        pop     esi
        mov     edx, 1
        pop     dword [ebp+NTFS.attr_size+4]
        pop     dword [ebp+NTFS.attr_size]
        mov     ecx, [ebp+NTFS.cur_read]
        pop     [ebp+NTFS.cur_buf]
        pop     [ebp+NTFS.cur_read]
        pop     [ebp+NTFS.cur_size]
        pop     [ebp+NTFS.cur_offs]
        jc      .errret
        or      edi, -1
        lea     ecx, [ecx+esi-1Ah]
.scanliststart:
        push    ecx
        mov     eax, [ebp+NTFS.cur_attr]
.scanlist:
        cmp     esi, [esp]
        jae     .scanlistdone
        cmp     eax, [esi]
        jz      @f
.scanlistcont:
        movzx   ecx, word [esi+4]
        add     esi, ecx
        jmp     .scanlist

@@:
; ignore named $DATA attributes (aka NTFS streams)
        cmp     eax, 0x80
        jnz     @f
        cmp     byte [esi+6], 0
        jnz     .scanlistcont
@@:
        push    eax
        mov     eax, [esi+8]
        test    eax, eax
        jnz     .testf
        mov     eax, dword [ebp+NTFS.attr_size]
        and     eax, dword [ebp+NTFS.attr_size+4]
        cmp     eax, -1
        jnz     .testfz
; if attribute is in auxiliary records, its size is defined only in first
        mov     eax, [esi+10h]
        call    ntfs_read_file_record
        jc      .errret_pop
        mov     eax, [ebp+NTFS.frs_buffer]
        movzx   ecx, word [eax+14h]
        add     eax, ecx
        mov     ecx, [ebp+NTFS.cur_attr]
@@:
        cmp     dword [eax], -1
        jz      .errret2_pop
        cmp     dword [eax], ecx
        jz      @f
.l1:
        add     eax, [eax+4]
        jmp     @b

@@:
        cmp     eax, 0x80
        jnz     @f
        cmp     byte [eax+9], 0
        jnz     .l1
@@:
        cmp     byte [eax+8], 0
        jnz     .sdnores
        mov     eax, [eax+10h]
        mov     dword [ebp+NTFS.attr_size], eax
        and     dword [ebp+NTFS.attr_size+4], 0
        jmp     .testfz

.sdnores:
        mov     ecx, [eax+30h]
        mov     dword [ebp+NTFS.attr_size], ecx
        mov     ecx, [eax+34h]
        mov     dword [ebp+NTFS.attr_size+4], ecx
.testfz:
        xor     eax, eax
.testf:
        imul    eax, [ebp+NTFS.sectors_per_cluster]
        cmp     eax, [ebp+NTFS.cur_offs]
        pop     eax
        ja      @f
        mov     edi, [esi+10h]  ; keep previous iRecord
        jmp     .scanlistcont

@@:
        pop     ecx
.scanlistfound:
        cmp     edi, -1
        jz      .ret
        mov     eax, [ebp+NTFS.cur_iRecord]
        mov     [ebp+NTFS.attr_iBaseRecord], eax
        mov     eax, edi
        jmp     .beginfindattr

.scanlistdone:
        pop     ecx
        sub     ecx, ebp
        sub     ecx, NTFS.attrlist_buf-1Ah
        cmp     [ebp+NTFS.cur_iRecord], 0
        jnz     @f
        sub     ecx, NTFS.attrlist_mft_buf-NTFS.attrlist_buf
@@:
        cmp     ecx, 0x400
        jnz     .scanlistfound
        inc     edx
        push    esi edi
        lea     esi, [ebp+NTFS.attrlist_buf+0x200]
        lea     edi, [ebp+NTFS.attrlist_buf]
        cmp     [ebp+NTFS.cur_iRecord], 0
        jnz     @f
        lea     esi, [ebp+NTFS.attrlist_mft_buf+0x200]
        lea     edi, [ebp+NTFS.attrlist_mft_buf]
@@:
        mov     ecx, 0x200/4
        rep movsd
        mov     eax, edi
        pop     edi esi
        sub     esi, 0x200
        push    [ebp+NTFS.cur_offs]
        push    [ebp+NTFS.cur_size]
        push    [ebp+NTFS.cur_read]
        push    [ebp+NTFS.cur_buf]
        push    dword [ebp+NTFS.attr_size]
        push    dword [ebp+NTFS.attr_size+4]
        or      dword [ebp+NTFS.attr_size], -1
        or      dword [ebp+NTFS.attr_size+4], -1
        mov     [ebp+NTFS.cur_offs], edx
        mov     [ebp+NTFS.cur_size], 1
        and     [ebp+NTFS.cur_read], 0
        mov     [ebp+NTFS.cur_buf], eax
        mov     ecx, [ebp+NTFS.attr_list]
        push    esi edx edi
        call    .doreadattr
        pop     edi edx esi
        mov     ecx, [ebp+NTFS.cur_read]
        pop     dword [ebp+NTFS.attr_size+4]
        pop     dword [ebp+NTFS.attr_size]
        pop     [ebp+NTFS.cur_buf]
        pop     [ebp+NTFS.cur_read]
        pop     [ebp+NTFS.cur_size]
        pop     [ebp+NTFS.cur_offs]
        jc      .errret
        lea     ecx, [ecx+ebp+NTFS.attrlist_buf+0x200-0x1A]
        cmp     [ebp+NTFS.cur_iRecord], 0
        jnz     .scanliststart
        add     ecx, NTFS.attrlist_mft_buf-NTFS.attrlist_buf
        jmp     .scanliststart

.doreadattr:
        mov     [ebp+NTFS.bCanContinue], 0
        cmp     byte [ecx+nonResidentFlag], 0
        jnz     .nonresident
        mov     eax, [ecx+sizeWithoutHeader]
        mov     esi, eax
        mov     edx, [ebp+NTFS.cur_offs]
        shr     eax, 9
        cmp     eax, edx
        jb      .okret
        shl     edx, 9
        sub     esi, edx
        movzx   eax, word [ecx+attributeOffset]
        add     edx, eax
        add     edx, ecx        ; edx -> data
        mov     eax, [ebp+NTFS.cur_size]
        cmp     eax, (0xFFFFFFFF shr 9)+1
        jbe     @f
        mov     eax, (0xFFFFFFFF shr 9)+1
@@:
        shl     eax, 9
        cmp     eax, esi
        jbe     @f
        mov     eax, esi
@@:
; eax = length, edx -> data
        mov     [ebp+NTFS.cur_read], eax
        mov     ecx, eax
        mov     eax, edx
        mov     ebx, [ebp+NTFS.cur_buf]
        call    memmove
        and     [ebp+NTFS.cur_size], 0      ; CF=0
        ret

.nonresident:
; Not all auxiliary records contain correct FileSize info
        mov     eax, dword [ebp+NTFS.attr_size]
        mov     edx, dword [ebp+NTFS.attr_size+4]
        push    eax
        and     eax, edx
        cmp     eax, -1
        pop     eax
        jnz     @f
        mov     eax, [ecx+attributeRealSize]
        mov     edx, [ecx+attributeRealSize+4]
        mov     dword [ebp+NTFS.attr_size], eax
        mov     dword [ebp+NTFS.attr_size+4], edx
@@:
        add     eax, 0x1FF
        adc     edx, 0
        shrd    eax, edx, 9
        sub     eax, [ebp+NTFS.cur_offs]
        ja      @f
; return with nothing read
        and     [ebp+NTFS.cur_size], 0
.okret:
        clc
        ret

@@:
; reduce read length
        and     [ebp+NTFS.cur_tail], 0
        cmp     [ebp+NTFS.cur_size], eax
        jb      @f
        mov     [ebp+NTFS.cur_size], eax
        mov     eax, dword [ebp+NTFS.attr_size]
        and     eax, 0x1FF
        mov     [ebp+NTFS.cur_tail], eax
@@:
        cmp     [ebp+NTFS.cur_size], 0
        jz      .okret
        mov     eax, [ebp+NTFS.cur_offs]
        xor     edx, edx
        div     [ebp+NTFS.sectors_per_cluster]
        sub     eax, [ecx+firstVCN]
        jb      .okret
; eax = cluster, edx = starting sector
        cmp     [ebp+NTFS.cur_attr], 0x80
        jnz     .sys
        cmp     [ebp+NTFS.cur_iRecord], 0
        jz      .sys
        push    fs_read64_app
        cmp     [ebp+NTFS.bWriteAttr], 1
        jnz     @f
        mov     dword[esp], fs_write64_app
        jmp     @f

.sys:
        push    fs_read64_sys
@@:
        sub     esp, 10h
        movzx   esi, word [ecx+dataRunsOffset]
        add     esi, ecx
        xor     edi, edi
        mov     [ebp+NTFS.fragmentCount], 0
.readloop:
        call    ntfs_decode_mcb_entry
        jnc     .break
        add     edi, [esp+8]
        sub     eax, [esp]
        jae     .readloop
        push    ecx
        push    eax
        add     eax, [esp+8]
        add     eax, edi
        imul    eax, [ebp+NTFS.sectors_per_cluster]
        add     eax, edx
        pop     ecx
        neg     ecx
        imul    ecx, [ebp+NTFS.sectors_per_cluster]
        sub     ecx, edx
        cmp     ecx, [ebp+NTFS.cur_size]
        jb      @f
        mov     ecx, [ebp+NTFS.cur_size]
@@:
        mov     ebx, [ebp+NTFS.cur_buf]
        mov     [ebp+NTFS.LastRead], eax
        push    ecx
        xor     edx, edx
        call    dword[esp+18h]
        pop     ecx
        test    eax, eax
        jnz     .errread2
        sub     [ebp+NTFS.cur_size], ecx
        add     [ebp+NTFS.cur_offs], ecx
        shl     ecx, 9
        add     [ebp+NTFS.cur_read], ecx
        add     [ebp+NTFS.cur_buf], ecx
        inc     [ebp+NTFS.fragmentCount]
        pop     ecx
        xor     eax, eax
        xor     edx, edx
        cmp     [ebp+NTFS.cur_size], 0
        jnz     .readloop
        add     esp, 14h
        mov     eax, [ebp+NTFS.cur_tail]
        test    eax, eax
        jz      @f
        sub     eax, 0x200
        add     [ebp+NTFS.cur_read], eax
@@:
        clc
        ret

.errread2:
        pop     ecx
        add     esp, 14h
        stc
        ret

.break:
        add     esp, 14h        ; CF=0
        mov     [ebp+NTFS.bCanContinue], 1
        ret

ntfs_read_file_record:
; in: eax = iRecord
; out: [ebp+NTFS.frs_buffer] -> file record
; CF=1 -> failed, eax = disk error code, eax=0 -> something with FS
    ; Read attr $DATA of $Mft, starting from eax*[ebp+NTFS.frs_size]
        push    ecx edx
        mov     ecx, [ebp+NTFS.frs_size]
        mul     ecx
        shrd    eax, edx, 9
        shr     edx, 9
        jnz     .errret
        push    [ebp+NTFS.attr_iRecord]
        push    [ebp+NTFS.attr_iBaseRecord]
        push    [ebp+NTFS.attr_offs]
        push    [ebp+NTFS.attr_list]
        push    dword [ebp+NTFS.attr_size+4]
        push    dword [ebp+NTFS.attr_size]
        push    [ebp+NTFS.cur_iRecord]
        push    [ebp+NTFS.cur_attr]
        push    [ebp+NTFS.cur_offs]
        push    [ebp+NTFS.cur_size]
        push    [ebp+NTFS.cur_buf]
        push    [ebp+NTFS.cur_read]
        mov     [ebp+NTFS.cur_attr], 0x80   ; $DATA
        and     [ebp+NTFS.cur_iRecord], 0   ; $Mft
        mov     [ebp+NTFS.cur_offs], eax
        shr     ecx, 9
        mov     [ebp+NTFS.cur_size], ecx
        mov     eax, [ebp+NTFS.frs_buffer]
        mov     [ebp+NTFS.cur_buf], eax
        call    ntfs_read_attr
        mov     edx, [ebp+NTFS.cur_read]
        pop     [ebp+NTFS.cur_read]
        pop     [ebp+NTFS.cur_buf]
        pop     [ebp+NTFS.cur_size]
        pop     [ebp+NTFS.cur_offs]
        pop     [ebp+NTFS.cur_attr]
        pop     [ebp+NTFS.cur_iRecord]
        pop     dword [ebp+NTFS.attr_size]
        pop     dword [ebp+NTFS.attr_size+4]
        pop     [ebp+NTFS.attr_list]
        pop     [ebp+NTFS.attr_offs]
        pop     [ebp+NTFS.attr_iBaseRecord]
        pop     [ebp+NTFS.attr_iRecord]
        jc      .ret
        cmp     edx, [ebp+NTFS.frs_size]
        jnz     .errret
        mov     eax, [ebp+NTFS.frs_buffer]
        cmp     dword [eax], 'FILE'
        jnz     .errret
        push    ebx
        mov     ebx, eax
        call    ntfs_restore_usa_frs
        pop     ebx
        jc      .errret
.ret:
        pop     edx ecx
        ret

.errret:
        pop     edx ecx
        xor     eax, eax
        stc
        ret

ntfs_restore_usa_frs:
        mov     eax, [ebp+NTFS.frs_size]
ntfs_restore_usa:
;   in:
; ebx -> record
; eax = size in bytes
        pushad
        shr     eax, 9
        mov     ecx, eax
        inc     eax
        cmp     [ebx+updateSequenceSize], ax
        jnz     .err
        movzx   eax, word [ebx+updateSequenceOffset]
        lea     esi, [eax+ebx]
        lodsw
        mov     edx, eax
        lea     edi, [ebx+0x1FE]
@@:
        cmp     [edi], dx
        jnz     .err
        lodsw
        stosw
        add     edi, 0x1FE
        loop    @b
        popad
        clc
        ret

.err:
        popad
        stc
        ret

ntfs_decode_mcb_entry:
;   in:
; esi -> MCB entry
; esp -> buffer (16 bytes)
;   out:
; esi -> next MCB entry
; esp -> data run size
; esp+8 -> cluster (delta)
; CF=0 -> MCB end
        push    eax ecx edi
        lea     edi, [esp+16]
        xor     eax, eax
        lodsb
        test    al, al
        jz      .end
        mov     ecx, eax
        and     ecx, 0xF
        cmp     ecx, 8
        ja      .end
        push    ecx
        rep movsb
        pop     ecx
        sub     ecx, 8
        neg     ecx
        cmp     byte [esi-1], 80h
        jae     .end
        push    eax
        xor     eax, eax
        rep stosb
        pop     ecx
        shr     ecx, 4
        cmp     ecx, 8
        ja      .end
        push    ecx
        rep movsb
        pop     ecx
        sub     ecx, 8
        neg     ecx
        cmp     byte [esi-1], 80h
        cmc
        sbb     eax, eax
        rep stosb
        stc
.end:
        pop     edi ecx eax
        ret

unichar_toupper:
        push    eax
        call    uni2ansi_char
        cmp     al, '_'
        jz      .unk
        add     esp, 4
        call    char_toupper
        jmp     ansi2uni_char
.unk:
        pop     eax
        ret

ntfs_find_lfn:
; in: [esi]+[esp+4] = name
;   out:
; [ebp+NTFS.cur_iRecord] = number of MFT fileRecord
; eax -> index in the parent index node
; CF=1 -> file not found, eax=0 -> error
        mov     [ebp+NTFS.cur_iRecord], 5   ; start from root directory
.doit2:
        mov     [ebp+NTFS.cur_attr], 0x90   ; $INDEX_ROOT
        and     [ebp+NTFS.cur_offs], 0
        mov     eax, [ebp+NTFS.cur_index_size]
        mov     [ebp+NTFS.cur_size], eax
        mov     eax, [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    ntfs_read_attr
        mov     eax, 0
        jc      .ret
        cmp     [ebp+NTFS.cur_read], 0x20
        jc      .ret
        pushad
        mov     esi, [ebp+NTFS.cur_index_buf]
        mov     edx, [esi+indexRecordSize]
        shr     edx, 9
        cmp     [ebp+NTFS.cur_index_size], edx
        jc      .realloc
        add     esi, rootNode
        mov     eax, [esi+nodeRealSize]
        add     eax, rootNode
        cmp     [ebp+NTFS.cur_read], eax
        jc      .err
        mov     edi, [esp+4]
; edi -> name, esi -> current index node, edx = subnode size
.scanloop:
        add     esi, [esi+indexOffset]
.scanloopint:
        test    byte [esi+indexFlags], 2
        jnz     .subnode
        push    esi
        movzx   ecx, byte [esi+fileNameLength]
        add     esi, fileName
        push    edi
@@:
        lodsw
        call    unichar_toupper
        push    eax
        mov     al, [edi]
        inc     edi
        cmp     al, '/'
        jz      .slash
        call    char_toupper
        call    ansi2uni_char
        cmp     ax, [esp]
        pop     eax
        loopz   @b
        jz      .found
        pop     edi
        pop     esi
        jb      .subnode
.scanloopcont:
        movzx   eax, word [esi+indexAllocatedSize]
        add     esi, eax
        jmp     .scanloopint

.realloc:
        mov     edi, edx
        stdcall kernel_alloc, [esi+indexRecordSize]
        test    eax, eax
        jz      .err
        push    [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_index_buf], eax
        call    kernel_free
        mov     [ebp+NTFS.cur_index_size], edi
        popad
        jmp     .doit2

.notfound:
        mov     [esp+1Ch], esi
.err:
        popad
        stc
.ret:
        ret     4

.slash:
        pop     eax
        pop     edi
        pop     esi
.subnode:
        test    byte [esi+indexFlags], 1
        jz      .notfound
        movzx   eax, word [esi+indexAllocatedSize]
        mov     eax, [esi+eax-8]
        imul    eax, [ebp+NTFS.sectors_per_cluster]
        mov     [ebp+NTFS.cur_offs], eax
        mov     [ebp+NTFS.cur_attr], 0xA0   ; $INDEX_ALLOCATION
        mov     [ebp+NTFS.cur_size], edx
        mov     eax, [ebp+NTFS.cur_index_buf]
        mov     esi, eax
        mov     [ebp+NTFS.cur_buf], eax
        call    ntfs_read_attr.newAttribute
        mov     eax, edx
        shl     eax, 9
        cmp     [ebp+NTFS.cur_read], eax
        jnz     .err
        cmp     dword [esi], 'INDX'
        jnz     .err
        mov     [ebp+NTFS.cur_buf], esi
        mov     ebx, esi
        call    ntfs_restore_usa
        jc      .err
        add     esi, recordNode
        jmp     .scanloop

.found:
        cmp     byte [edi], 0
        jz      .done
        cmp     byte [edi], '/'
        jz      .next
        pop     edi
        pop     esi
        jmp     .scanloopcont

.done:
.next:
        pop     esi
        pop     esi
        mov     eax, [esi]
        mov     [ebp+NTFS.cur_iRecord], eax
        mov     [esp+1Ch], esi
        mov     [esp+4], edi
        popad
        inc     esi
        cmp     byte [esi-1], 0
        jnz     .doit2
        cmp     dword [esp+4], 0
        jz      .ret
        mov     esi, [esp+4]
        mov     dword [esp+4], 0
        jmp     .doit2

;----------------------------------------------------------------
ntfs_ReadFile:
        cmp     byte [esi], 0
        jnz     @f
        or      ebx, -1
        movi    eax, ERROR_ACCESS_DENIED
        ret

@@:
        call    ntfs_lock
        stdcall ntfs_find_lfn, [esp+4]
        jnc     .found
        call    ntfs_unlock
        or      ebx, -1
        movi    eax, ERROR_FILE_NOT_FOUND
        ret

.found:
        mov     [ebp+NTFS.cur_attr], 0x80   ; $DATA
        and     [ebp+NTFS.cur_offs], 0
        and     [ebp+NTFS.cur_size], 0
        call    ntfs_read_attr
        jnc     @f
        call    ntfs_unlock
        or      ebx, -1
        movi    eax, ERROR_ACCESS_DENIED
        ret

@@:
        pushad
        and     dword [esp+10h], 0
        xor     eax, eax
        cmp     dword [ebx+8], 0x200
        jb      @f
.eof0:
        popad
        xor     ebx, ebx
.eof:
        call    ntfs_unlock
        movi    eax, ERROR_END_OF_FILE
        ret

@@:
        mov     ecx, [ebx+12]
        mov     edx, [ebx+16]
        mov     eax, [ebx+4]
        test    eax, 0x1FF
        jz      .alignedstart
        push    edx
        mov     edx, [ebx+8]
        shrd    eax, edx, 9
        pop     edx
        mov     [ebp+NTFS.cur_offs], eax
        mov     [ebp+NTFS.cur_size], 1
        lea     eax, [ebp+NTFS.bitmap_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    ntfs_read_attr.continue
        mov     eax, [ebx+4]
        and     eax, 0x1FF
        lea     esi, [ebp+NTFS.bitmap_buf+eax]
        sub     eax, [ebp+NTFS.cur_read]
        jae     .eof0
        neg     eax
        push    ecx
        cmp     ecx, eax
        jb      @f
        mov     ecx, eax
@@:
        mov     [esp+10h+4], ecx
        mov     edi, edx
        rep movsb
        mov     edx, edi
        pop     ecx
        sub     ecx, [esp+10h]
        jnz     @f
.retok:
        popad
        call    ntfs_unlock
        xor     eax, eax
        ret

@@:
        cmp     [ebp+NTFS.cur_read], 0x200
        jz      .alignedstart
.eof_ebx:
        popad
        jmp     .eof

.alignedstart:
        mov     eax, [ebx+4]
        push    edx
        mov     edx, [ebx+8]
        add     eax, 511
        adc     edx, 0
        shrd    eax, edx, 9
        pop     edx
        mov     [ebp+NTFS.cur_offs], eax
        mov     [ebp+NTFS.cur_buf], edx
        mov     eax, ecx
        shr     eax, 9
        mov     [ebp+NTFS.cur_size], eax
        add     eax, [ebp+NTFS.cur_offs]
        push    eax
        call    ntfs_read_attr.continue
        pop     [ebp+NTFS.cur_offs]
        mov     eax, [ebp+NTFS.cur_read]
        add     [esp+10h], eax
        mov     eax, ecx
        and     eax, not 0x1FF
        cmp     [ebp+NTFS.cur_read], eax
        jnz     .eof_ebx
        and     ecx, 0x1FF
        jz      .retok
        add     edx, [ebp+NTFS.cur_read]
        mov     [ebp+NTFS.cur_size], 1
        lea     eax, [ebp+NTFS.bitmap_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    ntfs_read_attr.continue
        cmp     [ebp+NTFS.cur_read], ecx
        jb      @f
        mov     [ebp+NTFS.cur_read], ecx
@@:
        xchg    ecx, [ebp+NTFS.cur_read]
        push    ecx
        mov     edi, edx
        lea     esi, [ebp+NTFS.bitmap_buf]
        add     [esp+10h+4], ecx
        rep movsb
        pop     ecx
        xor     eax, eax
        cmp     ecx, [ebp+NTFS.cur_read]
        jz      @f
        mov     al, ERROR_END_OF_FILE
@@:
        mov     [esp+1Ch], eax
        call    ntfs_unlock
        popad
        ret

;----------------------------------------------------------------
ntfs_ReadFolder:
        call    ntfs_lock
        mov     [ebp+NTFS.cur_iRecord], 5   ; root directory
        cmp     byte [esi], 0
        jz      @f
        stdcall ntfs_find_lfn, [esp+4]
        jc      ntfsNotFound
@@:
        mov     [ebp+NTFS.cur_attr], 0x10   ; $STANDARD_INFORMATION
        and     [ebp+NTFS.cur_offs], 0
        mov     [ebp+NTFS.cur_size], 1
        lea     eax, [ebp+NTFS.bitmap_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    ntfs_read_attr
        jc      ntfsFail
        mov     [ebp+NTFS.cur_attr], 0x90   ; $INDEX_ROOT
.doit:
        mov     eax, [ebp+NTFS.cur_index_size]
        mov     [ebp+NTFS.cur_size], eax
        mov     eax, [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    ntfs_read_attr.newAttribute
        jc      ntfsFail
        cmp     [ebp+NTFS.cur_read], 0x20
        jc      ntfsFail
        pushad
        mov     esi, [ebp+NTFS.cur_index_buf]
        mov     edx, [esi+indexRecordSize]
        shr     edx, 9
        cmp     [ebp+NTFS.cur_index_size], edx
        jc      .realloc
        mov     [ebp+NTFS.cur_subnode_size], edx
        add     esi, rootNode
        mov     eax, [esi+nodeRealSize]
        add     eax, rootNode
        cmp     [ebp+NTFS.cur_read], eax
        jc      .err
        mov     edx, [ebx+16]
        push    dword [ebx+8]   ; read ANSI/UNICODE name
; init header
        mov     edi, edx
        mov     ecx, 32/4
        xor     eax, eax
        rep stosd
        mov     byte [edx], 1   ; version
        mov     ecx, [ebx+12]
        mov     ebx, [ebx+4]
        push    edx
        mov     edx, esp
; edi -> BDFE, esi -> current index data, ebx = first wanted block,
; ecx = number of blocks to read
; edx -> parameters block: dd <output>, dd <flags>
        cmp     [ebp+NTFS.cur_iRecord], 5
        jz      .skip_specials
; dot and dotdot entries
        push    esi
        xor     esi, esi
        call    .add_special_entry
        inc     esi
        call    .add_special_entry
        pop     esi
.skip_specials:
; at first, dump index root
        add     esi, [esi+indexOffset]
.dump_root:
        test    byte [esi+indexFlags], 2
        jnz     .dump_root_done
        call    .add_entry
        movzx   eax, word [esi+indexAllocatedSize]
        add     esi, eax
        jmp     .dump_root

.realloc:
        mov     edi, edx
        stdcall kernel_alloc, [esi+indexRecordSize]
        test    eax, eax
        jz      .err
        push    [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_index_buf], eax
        call    kernel_free
        mov     [ebp+NTFS.cur_index_size], edi
        popad
        jmp     .doit

.err:
        popad
        jmp     ntfsFail

.dump_root_done:
; now dump all subnodes
        push    ecx edi
        lea     edi, [ebp+NTFS.bitmap_buf]
        mov     [ebp+NTFS.cur_buf], edi
        mov     ecx, 0x400/4
        xor     eax, eax
        rep stosd
        mov     [ebp+NTFS.cur_attr], 0xB0   ; $BITMAP
        and     [ebp+NTFS.cur_offs], 0
        mov     [ebp+NTFS.cur_size], 2
        call    ntfs_read_attr.newAttribute
        pop     edi ecx
        push    0       ; save offset in $BITMAP attribute
        and     [ebp+NTFS.cur_offs], 0
.dumploop:
        mov     [ebp+NTFS.cur_attr], 0xA0
        mov     eax, [ebp+NTFS.cur_subnode_size]
        mov     [ebp+NTFS.cur_size], eax
        mov     esi, [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_buf], esi
        mov     eax, [ebp+NTFS.cur_offs]
        push    eax
        imul    eax, [ebp+NTFS.cur_subnode_size]
        mov     [ebp+NTFS.cur_offs], eax
        call    ntfs_read_attr.newAttribute
        pop     [ebp+NTFS.cur_offs]
        mov     eax, [ebp+NTFS.cur_subnode_size]
        shl     eax, 9
        cmp     [ebp+NTFS.cur_read], eax
        jnz     .done
        push    eax
        mov     eax, [ebp+NTFS.cur_offs]
        and     eax, 0x400*8-1
        bt      dword [ebp+NTFS.bitmap_buf], eax
        pop     eax
        jnc     .dump_subnode_done
        cmp     dword [esi], 'INDX'
        jnz     .dump_subnode_done
        push    ebx
        mov     ebx, esi
        call    ntfs_restore_usa
        pop     ebx
        jc      .dump_subnode_done
        add     esi, recordNode
        add     esi, [esi+indexOffset]
.dump_subnode:
        test    byte [esi+indexFlags], 2
        jnz     .dump_subnode_done
        call    .add_entry
        movzx   eax, word [esi+indexAllocatedSize]
        add     esi, eax
        jmp     .dump_subnode

.dump_subnode_done:
        inc     [ebp+NTFS.cur_offs]
        test    [ebp+NTFS.cur_offs], 0x400*8-1
        jnz     .dumploop
        mov     [ebp+NTFS.cur_attr], 0xB0
        push    ecx edi
        lea     edi, [ebp+NTFS.bitmap_buf]
        mov     [ebp+NTFS.cur_buf], edi
        mov     ecx, 0x400/4
        xor     eax, eax
        rep stosd
        pop     edi ecx
        pop     eax
        push    [ebp+NTFS.cur_offs]
        inc     eax
        mov     [ebp+NTFS.cur_offs], eax
        mov     [ebp+NTFS.cur_size], 2
        push    eax
        call    ntfs_read_attr.newAttribute
        pop     eax
        pop     [ebp+NTFS.cur_offs]
        push    eax
        jmp     .dumploop

.done:
        pop     eax
        pop     edx
        mov     ebx, [edx+4]
        pop     edx
        xor     eax, eax
        dec     ecx
        js      @f
        mov     al, ERROR_END_OF_FILE
@@:
        mov     [esp+1Ch], eax
        mov     [esp+10h], ebx
        call    ntfs_unlock
        popad
        ret

.add_special_entry:
        mov     eax, [edx]
        inc     dword [eax+8]   ; new file found
        dec     ebx
        jns     .ret
        dec     ecx
        js      .ret
        inc     dword [eax+4]   ; new file block copied
        mov     eax, [edx+4]
        mov     [edi+4], eax
        mov     eax, 0x10
        stosd
        scasd
        push    edx
        mov     eax, dword [ebp+NTFS.bitmap_buf]
        mov     edx, dword [ebp+NTFS.bitmap_buf+4]
        call    ntfs_datetime_to_bdfe
        mov     eax, dword [ebp+NTFS.bitmap_buf+0x18]
        mov     edx, dword [ebp+NTFS.bitmap_buf+0x1C]
        call    ntfs_datetime_to_bdfe
        mov     eax, dword [ebp+NTFS.bitmap_buf+8]
        mov     edx, dword [ebp+NTFS.bitmap_buf+0xC]
        call    ntfs_datetime_to_bdfe
        pop     edx
        xor     eax, eax
        stosd
        stosd
        mov     al, '.'
        push    edi ecx
        lea     ecx, [esi+1]
        test    byte [edi-0x24], 1
        jz      @f
        rep stosw
        pop     ecx
        xor     eax, eax
        stosw
        pop     edi
        add     edi, 520
        ret

@@:
        rep stosb
        pop     ecx
        xor     eax, eax
        stosb
        pop     edi
        add     edi, 264
.ret:
        ret

.add_entry:
; do not return DOS 8.3 names
        cmp     byte [esi+namespace], 2
        jz      .ret
; do not return system files
; ... note that there will be no bad effects if system files also were reported ...
        cmp     dword [esi+fileRecordReference], 0x10
        jb      .ret
        mov     eax, [edx]
        inc     dword [eax+8]   ; new file found
        dec     ebx
        jns     .ret
        dec     ecx
        js      .ret
        inc     dword [eax+4]   ; new file block copied
        mov     eax, [edx+4]    ; flags
        call    ntfs_direntry_to_bdfe
        push    ecx esi edi
        movzx   ecx, byte [esi+fileNameLength]
        add     esi, fileName
        test    byte [edi-0x24], 1
        jz      .ansi
        shr     ecx, 1
        rep movsd
        adc     ecx, ecx
        rep movsw
        and     word [edi], 0
        pop     edi
        add     edi, 520
        pop     esi ecx
        ret

.ansi:
        jecxz   .skip
@@:
        lodsw
        call    uni2ansi_char
        stosb
        loop    @b
.skip:
        xor     al, al
        stosb
        pop     edi
        add     edi, 264
        pop     esi ecx
        ret

ntfs_direntry_to_bdfe:
        mov     [edi+4], eax    ; ANSI/UNICODE name
        mov     eax, [esi+fileFlags]
        test    eax, 0x10000000
        jz      @f
        and     eax, not 0x10000000
        or      al, 0x10
@@:
        stosd
        scasd
        push    edx
        mov     eax, [esi+fileCreated]
        mov     edx, [esi+fileCreated+4]
        call    ntfs_datetime_to_bdfe
        mov     eax, [esi+fileAccessed]
        mov     edx, [esi+fileAccessed+4]
        call    ntfs_datetime_to_bdfe
        mov     eax, [esi+fileModified]
        mov     edx, [esi+fileModified+4]
        call    ntfs_datetime_to_bdfe
        pop     edx
        mov     eax, [esi+fileRealSize]
        stosd
        mov     eax, [esi+fileRealSize+4]
        stosd
        ret

iglobal
months  db  31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
months2 db  31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
endg

ntfs_datetime_to_bdfe:
; edx:eax = number of 100-nanosecond intervals since January 1, 1601, in UTC
        push    ebx ecx
        mov     ebx, eax
        mov     eax, edx
        xor     edx, edx
        mov     ecx, 10000000
        div     ecx
        xchg    eax, ebx
        div     ecx
.forEXT:
        xchg    eax, ebx
        xor     edx, edx
        mov     ecx, 60
        div     ecx
        xchg    eax, ebx
        div     ecx
        mov     [edi], dl
        mov     edx, ebx
; edx:eax = number of minutes
        div     ecx
        mov     [edi+1], dl
; eax = number of hours
        xor     edx, edx
        mov     cl, 24
        div     ecx
        mov     [edi+2], dx
; eax = number of days since January 1, 1601
        xor     edx, edx
        mov     cx, 365
        div     ecx
        mov     ebx, eax
        add     ebx, 1601
        shr     eax, 2
        sub     edx, eax
        mov     cl, 25
        div     cl
        xor     ah, ah
        add     edx, eax
        shr     eax, 2
        sub     edx, eax
        jns     @f
        dec     ebx
        add     edx, 365
        test    bl, 3
        jnz     @f
        inc     edx
@@:
        xor     eax, eax
        mov     ecx, months-1
        test    bl, 3
        jnz     @f
        add     ecx, 12
@@:
        inc     ecx
        inc     eax
        sub     dl, [ecx]
        jnc     @b
        dec     dh
        jns     @b
        add     dl, [ecx]
        inc     edx
        mov     [edi+4], dl
        mov     [edi+5], al
        mov     [edi+6], bx
        add     edi, 8
        pop     ecx ebx
        ret

.sec:
        push    ebx ecx
        mov     ebx, edx
        jmp     .forEXT

;----------------------------------------------------------------
ntfs_CreateFolder:
        mov     [ebp+NTFS.bFolder], 1
        jmp     @f

ntfs_CreateFile:
        mov     [ebp+NTFS.bFolder], 0
@@:
        cmp     byte [esi], 0
        jnz     @f
        xor     ebx, ebx
        movi    eax, ERROR_ACCESS_DENIED
        ret

@@: ; 1. Search file
        call    ntfs_lock
        stdcall ntfs_find_lfn, [esp+4]
        jc      .notFound
; found, rewrite
        cmp     [ebp+NTFS.cur_iRecord], 16
        jc      ntfsDenied
        cmp     [ebp+NTFS.bFolder], 1
        jz      .folder
        cmp     [ebp+NTFS.fragmentCount], 1
        jnz     ntfsUnsupported     ; record fragmented
; edit directory node
        mov     edi, [ebp+NTFS.cur_index_buf]
        cmp     dword [edi], 'INDX'
        jz      @f
        mov     esi, [ebp+NTFS.frs_buffer]
        mov     ecx, [esi+recordRealSize]
        shr     ecx, 2
        rep movsd
        mov     esi, [ebp+NTFS.attr_offs]
        mov     cl, [esi+attributeOffset]
        sub     esi, [ebp+NTFS.frs_buffer]
        add     eax, ecx
        add     eax, esi
@@:
        mov     edx, [ebx+12]
        mov     [eax+fileRealSize], edx
        mov     dword [eax+fileRealSize+4], 0
        mov     eax, [ebp+NTFS.LastRead]
        mov     [ebp+NTFS.nodeLastRead], eax
        mov     [ebp+NTFS.cur_attr], 0x80
        mov     [ebp+NTFS.cur_offs], 0
        mov     [ebp+NTFS.cur_size], 0
        call    ntfs_read_attr
        jc      ntfsFail
        mov     ecx, [ebp+NTFS.frs_buffer]
        mov     eax, edx
        xor     edx, edx
        cmp     word [ecx+baseRecordReuse], 0
        jnz     ntfsUnsupported     ; auxiliary record
        mov     ecx, [ebp+NTFS.attr_offs]
        cmp     word [ecx+attributeFlags], 0
        jnz     ntfsUnsupported
        push    ebx
        cmp     byte [ecx+nonResidentFlag], 0
        jz      @f
        cmp     [ecx+attributeRealSize+4], edx
        jnz     @f
        cmp     [ecx+attributeRealSize], eax
        jz      ntfs_WriteFile.writeNode
@@:
        jmp     ntfs_WriteFile.resizeAttribute

.folder:
        bt      dword [eax+fileFlags], 28
        jnc     ntfsDenied
        push    0
        jmp     ntfsOut

.notFound:  ; create
        test    eax, eax
        jz      ntfsFail
        cmp     [ebp+NTFS.fragmentCount], 1
        jnz     ntfsUnsupported     ; record fragmented
; 2. Prepare directory record
        mov     ecx, esi
@@:         ; count characters
        inc     ecx
        cmp     byte [ecx], '/'
        jz      ntfsNotFound    ; path folder not found
        cmp     byte [ecx], 0
        jnz     @b
        sub     ecx, esi
        push    ecx     ; name length
        shl     ecx, 1
        add     ecx, fileName+7
        and     ecx, not 7
        mov     edi, [ebp+NTFS.cur_index_buf]
        mov     edx, [ebx+12]
        mov     [ebp+NTFS.fileRealSize], edx
        mov     edx, [ebx+16]
        mov     [ebp+NTFS.fileDataBuffer], edx
        push    esi
        push    ecx     ; index length
        mov     edx, ecx
        cmp     dword [edi], 'INDX'
        jz      .indexRecord
        mov     esi, [ebp+NTFS.frs_buffer]  ; indexRoot
        mov     ecx, [esi+recordRealSize]
        add     edx, ecx
        cmp     [esi+recordAllocatedSize], edx
        jc      .growTree
        mov     [esi+recordRealSize], edx
        shr     ecx, 2
        rep movsd
        mov     edi, [ebp+NTFS.attr_offs]
        sub     edi, [ebp+NTFS.frs_buffer]
        add     edi, [ebp+NTFS.cur_index_buf]
        mov     esi, [esp]
        add     [edi+sizeWithHeader], esi
        add     [edi+sizeWithoutHeader], esi
        mov     cl, [edi+attributeOffset]
        add     edi, ecx
        add     [edi+rootNode+nodeRealSize], esi
        add     [edi+rootNode+nodeAllocatedSize], esi
        sub     eax, [ebp+NTFS.cur_index_buf]
        add     eax, edi
        mov     edi, [ebp+NTFS.cur_index_buf]
        jmp     .common

@@:
        add     esp, 16
        jmp     ntfsUnsupported

.growTree:
        sub     eax, rootNode
        sub     eax, [edi+rootNode+indexOffset]
        push    eax
; create indexRecord
        mov     ecx, 10
        xor     eax, eax
        rep stosd
        rdtsc
        stosw
        mov     esi, [ebp+NTFS.attr_offs]
        mov     cl, [esi+attributeOffset]
        add     esi, ecx
        mov     eax, [esi+indexRecordSizeClus]
        cmp     eax, 129
        jnc     @b
        mov     [ebp+NTFS.fileDataSize], eax
        mov     eax, [esi+indexRecordSize]
        cmp     eax, [ebp+NTFS.frs_size]
        jc      @b
        shr     eax, 9
        inc     eax
        mov     edi, [ebp+NTFS.cur_index_buf]
        mov     dword[edi], 'INDX'
        mov     byte [edi+updateSequenceOffset], 28h
        mov     [edi+updateSequenceSize], al
        add     edi, recordNode
        shl     eax, 1
        add     eax, 28h-recordNode+7
        and     eax, not 7
        mov     [edi+indexOffset], eax
        mov     ecx, [esi+indexRecordSize]
        sub     ecx, recordNode
        mov     [edi+nodeAllocatedSize], ecx
        add     esi, rootNode
        push    esi
        mov     ecx, [esi+nodeRealSize]
        sub     ecx, [esi+indexOffset]
        add     eax, ecx
        mov     [edi+nodeRealSize], eax
        shr     ecx, 2
        add     esi, [esi+indexOffset]
        add     edi, [edi+indexOffset]
        rep movsd       ; copy root indexes
; clear root node
        mov     cl, 10
        mov     edi, [esp]
        xor     eax, eax
        rep stosd
        pop     edi
        mov     byte [edi+indexOffset], 16
        mov     byte [edi+nodeRealSize], 28h
        mov     byte [edi+nodeAllocatedSize], 28h
        mov     byte [edi+nonLeafFlag], 1
        mov     byte [edi+16+indexAllocatedSize], 18h
        mov     byte [edi+16+indexFlags], 3
        mov     esi, [ebp+NTFS.attr_offs]
        add     edi, 28h
        mov     eax, edi
        sub     eax, esi
        mov     word [esi+sizeWithoutHeader], 38h
        xchg    [esi+sizeWithHeader], eax
        cmp     byte [esi+eax], -1
        jnz     @b
        mov     cl, 32
        xor     eax, eax
        push    edi
        rep stosd
        mov     edi, [ebp+NTFS.BitmapStart]
        call    ntfsSpaceAlloc
        jnc     @f
        add     esp, 20
        jmp     ntfsDiskFull

@@:         ; create $IndexAllocation
        pop     edi
        mov     byte [edi+attributeType], 0xA0
        mov     byte [edi+nonResidentFlag], 1
        mov     byte [edi+nameLength], 4
        mov     byte [edi+nameOffset], 40h
        mov     byte [edi+dataRunsOffset], 48h
        mov     byte [edi+sizeWithHeader], 50h
        mov     eax, [ebp+NTFS.fileDataSize]
        dec     eax
        mov     [edi+lastVCN], eax
        inc     eax
        mul     [ebp+NTFS.sectors_per_cluster]
        shl     eax, 9
        mov     [edi+attributeAllocatedSize], eax
        mov     [edi+attributeRealSize], eax
        mov     [edi+initialDataSize], eax
        mov     dword[edi+40h], 490024h     ; unicode $I30
        mov     dword[edi+40h+4], 300033h
        push    edi
        mov     esi, edi
        add     edi, 48h
        call    createMcbEntry
        mov     esi, [ebp+NTFS.frs_buffer]
        pop     edi
        mov     al, [esi+newAttributeID]
        mov     [edi+attributeID], al
        add     edi, 50h
        inc     eax
; create $Bitmap
        mov     [edi+attributeID], al
        inc     eax
        mov     [esi+newAttributeID], al
        mov     byte [edi+attributeType], 0xB0
        mov     byte [edi+nameLength], 4
        mov     byte [edi+nameOffset], 18h
        mov     byte [edi+attributeOffset], 20h
        mov     byte [edi+sizeWithoutHeader], 8
        mov     byte [edi+sizeWithHeader], 28h
        mov     dword[edi+18h], 490024h     ; unicode $I30
        mov     dword[edi+18h+4], 300033h
        mov     byte [edi+20h], 1
        mov     dword[edi+28h], -1
        add     edi, 30h
        sub     edi, esi
        mov     [esi+recordRealSize], edi
        mov     [ebp+NTFS.cur_buf], esi
        call    writeRecord     ; fileRecord
        mov     eax, [ebp+NTFS.fileDataStart]
        mul     [ebp+NTFS.sectors_per_cluster]
        mov     [ebp+NTFS.LastRead], eax
        mov     eax, [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    writeRecord     ; indexRecord
        mov     ebx, [ebp+NTFS.cur_index_buf]
        mov     ax, [ebx+6]
        dec     eax
        shl     eax, 9
        call    ntfs_restore_usa
        mov     edi, [ebp+NTFS.cur_index_buf]
        pop     eax
        add     eax, recordNode
        add     eax, [edi+recordNode+indexOffset]
        mov     edx, [esp]
.indexRecord:
        add     edi, recordNode
        add     edx, [edi+nodeRealSize]
        cmp     [edi+nodeAllocatedSize], edx
        jnc     @f
        add     esp, 12
        jmp     ntfsUnsupported     ; new node required

@@:         ; index fits in the node
        mov     [edi+nodeRealSize], edx
.common:
        add     edi, edx
        sub     edi, 4
        mov     esi, edi
        sub     esi, [esp]
        mov     ecx, esi
        sub     ecx, eax    ; eax = pointer in the record
        shr     ecx, 2
        inc     ecx
        std
        rep movsd           ; move forward, make space
        mov     ecx, [esp]
        shr     ecx, 2
        xor     eax, eax
        rep stosd
        cld
        add     edi, 4
        pop     ecx
        pop     esi
        mov     [edi+indexAllocatedSize], cx    ; fill index with data
        mov     eax, [esp]
        shl     eax, 1
        add     eax, 42h
        mov     [edi+indexRawSize], ax
        mov     eax, [ebp+NTFS.attr_iRecord]
        mov     [edi+directoryRecordReference], eax
        mov     eax, [ebp+NTFS.frs_buffer]
        mov     eax, [eax+reuseCounter]
        mov     [edi+directoryReferenceReuse], ax
        mov     eax, [ebp+NTFS.frs_size]
        shr     eax, 8
        add     ecx, 30h+48h+8+18h+8
        add     ecx, eax
        mov     eax, [ebp+NTFS.fileRealSize]
        add     ecx, eax
        mov     [edi+fileRealSize], eax
        cmp     [ebp+NTFS.frs_size], ecx
        jc      @f
        xor     eax, eax
@@:
        mov     ecx, [ebp+NTFS.sectors_per_cluster]
        shl     ecx, 9
        add     eax, ecx
        dec     eax
        xor     edx, edx
        div     ecx
        mov     [ebp+NTFS.fileDataSize], eax
        mul     ecx
        mov     [edi+fileAllocatedSize], eax
        pop     ecx
        mov     [ebp+NTFS.indexOffset], edi
        mov     [edi+fileNameLength], cl
        add     edi, fileName
@@:         ; record filename
        lodsb
        call    ansi2uni_char
        stosw
        dec     ecx
        jnz     @b
        mov     eax, [ebp+NTFS.LastRead]
        mov     [ebp+NTFS.nodeLastRead], eax
        cmp     [ebp+NTFS.bFolder], 0
        jz      @f
        mov     edi, [ebp+NTFS.indexOffset]
        bts     dword [edi+fileFlags], 28
        jmp     .mftBitmap

@@: ; 3. File data
        cmp     [ebp+NTFS.fileDataSize], 0
        jz      .mftBitmap
        mov     edi, [ebp+NTFS.BitmapStart]
        call    ntfsSpaceAlloc
        jc      ntfsDiskFull
        mov     eax, [ebp+NTFS.fileDataStart]
        mul     [ebp+NTFS.sectors_per_cluster]
        mov     ecx, [ebp+NTFS.fileRealSize]
        add     ecx, 511
        shr     ecx, 9
        mov     ebx, [ebp+NTFS.fileDataBuffer]
        call    fs_write64_app
        test    eax, eax
        jnz     ntfsDevice
    ; 4. MFT record
.mftBitmap: ; search for free record
        mov     edi, [ebp+NTFS.mftBitmapBuffer]
        mov     ecx, [ebp+NTFS.mftBitmapSize]
        mov     al, -1
        add     edi, 3
        sub     ecx, 3
        repz scasb
        dec     edi
        movzx   eax, byte [edi]
        not     al
        bsf     ecx, eax
        jz      .extendBitmapMFT    ; no free records
        bts     [edi], ecx
; get record location
        sub     edi, [ebp+NTFS.mftBitmapBuffer]
        shl     edi, 3
        add     edi, ecx
        mov     [ebp+NTFS.newMftRecord], edi
        mov     eax, [ebp+NTFS.frs_size]
        shr     eax, 9
        mul     edi
        mov     [ebp+NTFS.cur_iRecord], 0
        mov     [ebp+NTFS.cur_attr], 0x80
        mov     [ebp+NTFS.cur_offs], eax
        mov     [ebp+NTFS.cur_size], 1
        mov     eax, [ebp+NTFS.frs_buffer]
        mov     [ebp+NTFS.cur_buf], eax
        call    ntfs_read_attr
        cmp     [ebp+NTFS.cur_read], 0
        jz      .extendMFT
        jmp     .mftRecord

.extendBitmapMFT:
        mov     eax, [ebp+NTFS.sectors_per_cluster]
        shl     eax, 9
        cmp     [ebp+NTFS.mftBitmapSize], eax
        jnc     ntfsUnsupported
        mov     [ebp+NTFS.cur_iRecord], 0
        mov     [ebp+NTFS.cur_attr], 0xB0
        mov     [ebp+NTFS.cur_offs], 0
        mov     [ebp+NTFS.cur_size], 0
        call    ntfs_read_attr
        jc      ntfsFail
        mov     eax, [ebp+NTFS.mft_cluster]
        mul     [ebp+NTFS.sectors_per_cluster]
        cmp     eax, [ebp+NTFS.LastRead]
        jnz     ntfsUnsupported     ; auxiliary record
        mov     edi, [ebp+NTFS.mftBitmapBuffer]
        mov     ecx, [ebp+NTFS.mftBitmapSize]
        add     edi, ecx
        mov     eax, ecx
        mov     edx, [ebp+NTFS.attr_offs]
        add     ecx, 8
        mov     [edx+attributeRealSize], ecx
        mov     [edx+initialDataSize], ecx
        shl     eax, 3
        mov     [ebp+NTFS.newMftRecord], eax
        mov     dword [edi], 1
        mov     dword [edi+4], 0
        mov     [ebp+NTFS.cur_attr], 0x80
        call    ntfs_read_attr.newAttribute
        jc      ntfsFail
        mov     [ebp+NTFS.mftBitmapSize], ecx
.extendMFT:
        mov     eax, [ebp+NTFS.mft_cluster]
        mul     [ebp+NTFS.sectors_per_cluster]
        cmp     eax, [ebp+NTFS.LastRead]
        jnz     ntfsUnsupported     ; auxiliary record
        mov     ecx, [ebp+NTFS.attr_offs]
        mov     eax, [ecx+attributeRealSize]
        mov     edx, [ecx+attributeRealSize+4]
        xor     ax, ax
        add     eax, 10000h
        adc     edx, 0
        push    [ebp+NTFS.fileDataStart]
        push    [ebp+NTFS.fileDataSize]
        call    resizeAttribute
        jc      ntfsErrorPop2
        mov     eax, [ebp+NTFS.frs_buffer]
        mov     [ebp+NTFS.cur_buf], eax
        call    writeRecord     ; $MFT
        mov     eax, [ebp+NTFS.mftmirr_cluster]
        mul     [ebp+NTFS.sectors_per_cluster]
        mov     ebx, [ebp+NTFS.frs_buffer]
        movzx   ecx, word [ebx+updateSequenceSize]
        dec     ecx
        call    fs_write64_sys  ; $MFTMirr
        call    ntfsSpaceClean
        pop     [ebp+NTFS.fileDataSize]
        pop     [ebp+NTFS.fileDataStart]
.mftRecord:
        mov     ecx, [ebp+NTFS.frs_size]
        shr     ecx, 2
        mov     edi, [ebp+NTFS.frs_buffer]
        xor     eax, eax
        rep stosd
        mov     edi, [ebp+NTFS.frs_buffer]
; record header
        rdtsc
        mov     [edi+2ah], ax
        mov     eax, [ebp+NTFS.frs_size]
        mov     [edi+recordAllocatedSize], eax
        shr     eax, 9
        inc     eax
        mov     [edi+updateSequenceSize], al
        shl     eax, 1
        add     eax, 2ah+7
        and     eax, not 7
        mov     dword[edi], 'FILE'
        mov     byte [edi+updateSequenceOffset], 2ah
        mov     byte [edi+hardLinkCounter], 1
        mov     byte [edi+newAttributeID], 3
        mov     [edi+attributeOffset], al
        add     edi, eax
; $StandardInformation
        mov     byte [edi+attributeType], 10h
        mov     byte [edi+sizeWithHeader], 48h
        mov     byte [edi+sizeWithoutHeader], 30h
        mov     byte [edi+attributeOffset], 18h
        add     edi, 48h
; $FileName
        mov     esi, [ebp+NTFS.indexOffset]
        mov     byte [edi+attributeType], 30h
        mov     byte [edi+attributeID], 1
        mov     byte [edi+attributeOffset], 18h
        mov     byte [edi+indexedFlag], 1
        mov     cx, [esi+indexRawSize]
        mov     [edi+sizeWithoutHeader], ecx
        mov     cx, [esi+indexAllocatedSize]
        add     ecx, 8
        mov     [edi+sizeWithHeader], ecx
        add     edi, 18h
        add     esi, 16
        sub     ecx, 18h
        shr     ecx, 2
        rep movsd
        mov     byte [edi+sizeWithHeader], 50h
        mov     byte [edi+attributeID], 2
        cmp     [ebp+NTFS.bFolder], 1
        jz      .indexRoot
; $Data
        mov     byte [edi+attributeType], 80h
        mov     eax, [ebp+NTFS.fileDataSize]
        test    eax, eax
        jz      .resident
        mov     esi, [ebp+NTFS.indexOffset]
        dec     eax
        mov     [edi+lastVCN], eax
        mov     byte [edi+nonResidentFlag], 1
        mov     byte [edi+dataRunsOffset], 40h
        mov     eax, [esi+fileAllocatedSize]
        mov     [edi+attributeAllocatedSize], eax
        mov     eax, [esi+fileRealSize]
        mov     [edi+attributeRealSize], eax
        mov     [edi+initialDataSize], eax
        push    edi
        mov     esi, edi
        add     edi, 40h
        call    createMcbEntry
        inc     edi
        jmp     @f

.resident:
        mov     ecx, [ebp+NTFS.fileRealSize]
        mov     [edi+sizeWithoutHeader], ecx
        mov     byte [edi+attributeOffset], 18h
        push    edi
        mov     esi, [ebp+NTFS.fileDataBuffer]
        add     edi, 18h
        rep movsb
@@:
        mov     eax, edi
        pop     edi
        sub     eax, edi
        add     eax, 7
        and     eax, not 7
        mov     [edi+sizeWithHeader], eax
        add     edi, eax
        mov     al, 1
        jmp     .end

.indexRoot:
        mov     byte [edi+attributeType], 90h
        mov     byte [edi+nameLength], 4
        mov     byte [edi+nameOffset], 18h
        mov     byte [edi+sizeWithoutHeader], 30h
        mov     byte [edi+attributeOffset], 20h
        mov     dword[edi+18h], 490024h     ; unicode $I30
        mov     dword[edi+18h+4], 300033h
        mov     byte [edi+20h+indexedAttributesType], 30h
        mov     byte [edi+20h+collationRule], 1
        mov     eax, [ebp+NTFS.sectors_per_cluster]
        mov     dl, 1
        shl     eax, 8
@@:
        shl     eax, 1
        shl     edx, 1
        cmp     eax, [ebp+NTFS.frs_size]
        jc      @b
        shr     edx, 1
        mov     [edi+20h+indexRecordSize], eax
        mov     [edi+20h+indexRecordSizeClus], dl
        mov     byte [edi+30h+indexOffset], 16
        mov     byte [edi+30h+nodeRealSize], 32
        mov     byte [edi+30h+nodeAllocatedSize], 32
        mov     byte [edi+40h+indexAllocatedSize], 16
        mov     byte [edi+40h+indexFlags], 2
        add     edi, 50h
        mov     al, 3
.end:
        mov     esi, [ebp+NTFS.frs_buffer]
        mov     dword [edi], -1
        mov     dword [edi+4], 0
        add     edi, 8
        sub     edi, esi
        mov     [ebp+NTFS.cur_buf], esi
        mov     [esi+recordFlags], al
        mov     [esi+recordRealSize], edi
        call    writeRecord
; write MFT bitmap
        mov     eax, [ebp+NTFS.newMftRecord]
        shr     eax, 3+9
        mov     ebx, eax
        shl     ebx, 9
        add     eax, [ebp+NTFS.mftBitmapLocation]
        add     ebx, [ebp+NTFS.mftBitmapBuffer]
        mov     ecx, 1
        xor     edx, edx
        call    fs_write64_sys
        mov     edi, [ebp+NTFS.indexOffset]
        mov     eax, [ebp+NTFS.newMftRecord]
        mov     [edi+fileRecordReference], eax
; 5. Write directory node
        mov     eax, [ebp+NTFS.nodeLastRead]
        mov     [ebp+NTFS.LastRead], eax
        mov     eax, [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    writeRecord
        mov     ebx, [ebp+NTFS.fileRealSize]
ntfsDone:
        mov     esi, [ebp+PARTITION.Disk]
        call    disk_sync
        call    ntfs_unlock
        xor     eax, eax
        ret

writeRecord:
; make updateSequence and write to disk
;   in:
; [ebp+NTFS.cur_buf] -> record
; [ebp+NTFS.LastRead] = partition sector
        mov     esi, [ebp+NTFS.cur_buf]
        mov     edi, esi
        movzx   ecx, word [esi+updateSequenceOffset]
        add     edi, ecx
        mov     ax, [edi]
        inc     ax
        stosw
        mov     cx, [esi+updateSequenceSize]
        dec     ecx
        push    ecx
@@:
        add     esi, 510
        movsw
        mov     [esi-2], ax
        dec     ecx
        jnz     @b
        mov     eax, [ebp+NTFS.LastRead]
        mov     ebx, [ebp+NTFS.cur_buf]
        pop     ecx
        xor     edx, edx
        jmp     fs_write64_sys

createMcbEntry:
;   in:
; [ebp+NTFS.fileDataStart] = position value
; [ebp+NTFS.fileDataSize] = size value
; edi -> destination
; esi -> attribute header
        mov     eax, [ebp+NTFS.fileDataStart]
        xor     edx, edx
        shl     eax, 1
        jnc     @f
        not     eax
@@:
        inc     edx
        shr     eax, 8
        jnz     @b
        mov     eax, [ebp+NTFS.fileDataSize]
        shl     eax, 1
        xor     ecx, ecx
@@:
        inc     ecx
        shr     eax, 8
        jnz     @b
        lea     eax, [edi+edx+1]
        add     eax, ecx
        sub     eax, esi
        sub     eax, [esi+sizeWithHeader]
        jc      @f
        add     word [esi+sizeWithHeader], 8    ; extend attribute
        mov     esi, [ebp+NTFS.frs_buffer]
        mov     eax, [esi+recordRealSize]
        add     eax, 8
        cmp     [esi+recordAllocatedSize], eax
        jc      .end    ; no space in the record
        mov     [esi+recordRealSize], eax
        push    ecx edi
        add     esi, eax
        mov     ecx, esi
        sub     ecx, edi
        sub     ecx, 8
        shr     ecx, 2
        mov     edi, esi
        sub     edi, 4
        sub     esi, 12
        std
        rep movsd
        cld
        pop     edi ecx
@@:
        mov     eax, edx
        shl     eax, 4
        add     eax, ecx
        stosb
        lea     esi, [ebp+NTFS.fileDataSize]
        rep movsb
        lea     esi, [ebp+NTFS.fileDataStart]
        mov     ecx, edx
        rep movsb
        mov     [edi], cl
.end:
        ret

resizeAttribute:
;   in:
; [ebp+NTFS.frs_buffer] -> file record
; [ebp+NTFS.attr_offs] -> attribute
; edx:eax = new size
;   out:
; [ebp+NTFS.fileDataSize] = clusters added (positive)
; [ebp+NTFS.fileDataStart] = added block
; CF=1 -> eax = error code
        mov     esi, [ebp+NTFS.attr_offs]
        mov     dword [ebp+NTFS.attr_size], eax
        mov     dword [ebp+NTFS.attr_size+4], edx
        cmp     byte [esi+nonResidentFlag], 0
        jz      .resident
        mov     ecx, [ebp+NTFS.sectors_per_cluster]
        shl     ecx, 9
        mov     [esi+attributeRealSize], eax
        mov     [esi+attributeRealSize+4], edx
        mov     [esi+initialDataSize], eax
        mov     [esi+initialDataSize+4], edx
        sub     eax, 1
        sbb     edx, 0
        jc      .makeResident
        div     ecx
        mov     edi, eax
        inc     eax
        mul     ecx
        mov     [esi+attributeAllocatedSize], eax
        mov     [esi+attributeAllocatedSize+4], edx
        mov     ecx, [esi+lastVCN]
        mov     [esi+lastVCN], edi
        movzx   eax, byte [esi+dataRunsOffset]
        sub     edi, ecx
        mov     [ebp+NTFS.fileDataSize], edi
        jz      .done
        jc      .shrinkAttribute
; extend attribute
        xor     edi, edi
        add     esi, eax
        push    edi edi edi edi
@@:
        mov     edx, eax
        mov     eax, esi
        add     edi, [esp+8]
        call    ntfs_decode_mcb_entry
        jc      @b
        mov     [esp+4], edx
        mov     [esp+12], edi
        add     edi, [esp]
        push    edi
        shr     edi, 5
        shl     edi, 2
        push    eax
        cmp     [ebp+NTFS.cur_iRecord], 0
        jz      @f
        cmp     edi, [ebp+NTFS.BitmapStart]
        jc      .err1
@@:
        call    ntfsSpaceAlloc
        jc      .err1
        mov     eax, [ebp+NTFS.fileDataStart]
        pop     edi
        pop     edx
        cmp     edx, eax
        jnz     .newEntry
        pop     edx
        pop     edi
        pop     [ebp+NTFS.fileDataStart]
        mov     [esp], eax
        push    [ebp+NTFS.fileDataSize]
        add     [ebp+NTFS.fileDataSize], edx
        jmp     @f

.newEntry:
        add     esp, 12
        pop     edx
        push    eax
        push    [ebp+NTFS.fileDataSize]
        sub     eax, edx
        mov     [ebp+NTFS.fileDataStart], eax
@@:
        mov     esi, [ebp+NTFS.attr_offs]
        call    createMcbEntry
        pop     [ebp+NTFS.fileDataSize]
        pop     [ebp+NTFS.fileDataStart]
        movi    eax, ERROR_UNSUPPORTED_FS
.done:
        ret

.err1:
        add     esp, 24
        stc
.err2:
        movi    eax, ERROR_DISK_FULL
        ret

.err3:
        movi    eax, ERROR_FS_FAIL
        add     esp, 20
        stc
        ret

.shrinkAttribute:
        add     ecx, edi
        inc     ecx
        add     esi, eax
        xor     edi, edi
        sub     esp, 20
@@:
        mov     [esp+16], esi
        call    ntfs_decode_mcb_entry
        jnc     .err3
        add     edi, [esp+8]
        sub     ecx, [esp]
        jnc     @b
        mov     ebx, ecx
        add     ecx, [esp]
        mov     eax, [esp+8]
        mov     [ebp+NTFS.fileDataSize], ecx
        mov     [ebp+NTFS.fileDataStart], eax
        push    edi
        add     edi, ecx
        neg     ebx
        call    ntfsSpaceFree
        pop     edi
        jc      .end
@@:
        call    ntfs_decode_mcb_entry
        jnc     .end
        cmp     dword[esp+8], 0
        jz      @b
        add     edi, [esp+8]
        mov     ebx, [esp]
        call    ntfsSpaceFree
        jnc     @b
.end:
        add     esp, 16
        pop     edi
        cmp     [ebp+NTFS.fileDataSize], 0
        jz      @f
        mov     esi, [ebp+NTFS.attr_offs]
        call    createMcbEntry
        mov     [ebp+NTFS.fileDataSize], 0
@@:
        ret

.resident:
        test    edx, edx
        jnz     .nonResident
        cmp     eax, 8000h
        jnc     .nonResident
        add     ax, [esi+attributeOffset]
        sub     eax, [esi+sizeWithHeader]
        jc      @f
        mov     edi, [ebp+NTFS.frs_buffer]
        mov     ecx, eax
        add     ecx, [edi+recordRealSize]
        cmp     [edi+recordAllocatedSize], ecx
        jc      .nonResident
        add     eax, 7
        and     eax, not 7
        add     [edi+recordRealSize], eax
        add     edi, [edi+recordRealSize]
        add     [esi+sizeWithHeader], eax
        add     esi, [esi+sizeWithHeader]
        mov     ecx, edi
        sub     ecx, esi
        shr     ecx, 2
        sub     edi, 4
        mov     esi, edi
        sub     esi, eax
        std
        rep movsd
        mov     ecx, eax
        shr     ecx, 2
        xor     eax, eax
        rep stosd
        cld
        mov     esi, [ebp+NTFS.attr_offs]
@@:
        mov     eax, dword [ebp+NTFS.attr_size]
        mov     [esi+sizeWithoutHeader], eax
        mov     [ebp+NTFS.fileDataSize], 0
        clc
        ret

.nonResident:   ; convert resident to non-resident
        mov     eax, dword [ebp+NTFS.attr_size]
        sub     eax, 1
        sbb     edx, 0
        mov     ecx, [ebp+NTFS.sectors_per_cluster]
        shl     ecx, 9
        div     ecx
        inc     eax
        mov     [ebp+NTFS.fileDataSize], eax
        mov     edi, [ebp+NTFS.BitmapStart]
        push    ecx
        call    ntfsSpaceAlloc
        pop     ecx
        jc      .err2
        mov     esi, [ebp+NTFS.attr_offs]
        xor     eax, eax
        xor     edx, edx
@@:
        add     eax, ecx
        inc     edx
        cmp     eax, [esi+sizeWithoutHeader]
        jc      @b
        push    edx
        push    eax
        stdcall kernel_alloc, eax
        mov     ecx, [esp]
        shr     ecx, 2
        mov     edi, eax
        mov     ebx, eax
        xor     eax, eax
        rep stosd
        mov     al, [esi+attributeOffset]
        mov     ecx, [esi+sizeWithoutHeader]
        add     esi, eax
        mov     edi, ebx
        rep movsb
        mov     eax, [ebp+NTFS.fileDataStart]
        mul     [ebp+NTFS.sectors_per_cluster]
        pop     ecx
        shr     ecx, 9
        call    fs_write64_app
        stdcall kernel_free, ebx
        mov     esi, [ebp+NTFS.attr_offs]
        add     esi, [esi+sizeWithHeader]
        mov     ecx, [ebp+NTFS.frs_buffer]
        add     ecx, [ecx+recordRealSize]
        sub     ecx, esi
        shr     ecx, 2
        lea     edi, [ebp+NTFS.bitmap_buf]
        push    ecx
        rep movsd
        mov     edi, [ebp+NTFS.attr_offs]
        add     edi, 16
        mov     cl, 6
        xor     eax, eax
        rep stosd
        mov     edi, [ebp+NTFS.attr_offs]
        mov     eax, [ebp+NTFS.fileDataSize]
        dec     eax
        mov     [edi+lastVCN], eax
        inc     eax
        mov     ecx, [ebp+NTFS.sectors_per_cluster]
        shl     ecx, 9
        mul     ecx
        mov     byte [edi+sizeWithHeader], 50h
        mov     byte [edi+nonResidentFlag], 1
        mov     byte [edi+dataRunsOffset], 40h
        mov     [edi+attributeAllocatedSize], eax
        mov     [edi+attributeAllocatedSize+4], edx
        mov     eax, dword [ebp+NTFS.attr_size]
        mov     edx, dword [ebp+NTFS.attr_size+4]
        mov     [edi+attributeRealSize], eax
        mov     [edi+attributeRealSize+4], edx
        mov     [edi+initialDataSize], eax
        mov     [edi+initialDataSize+4], edx
        mov     esi, edi
        add     edi, 40h
        call    createMcbEntry
        mov     eax, edi
        mov     edi, [ebp+NTFS.attr_offs]
        sub     eax, edi
        add     eax, 8
        and     eax, not 7
        mov     [edi+sizeWithHeader], eax
        pop     ecx
        lea     esi, [ebp+NTFS.bitmap_buf]
        add     edi, eax
        rep movsd
        mov     esi, [ebp+NTFS.frs_buffer]
        sub     edi, esi
        mov     [esi+recordRealSize], edi
        pop     edx
        sub     [ebp+NTFS.fileDataSize], edx
        add     [ebp+NTFS.fileDataStart], edx
        ret

.makeResident:  ; convert non-resident to empty resident
        movzx   eax, byte [esi+dataRunsOffset]
        mov     byte [esi+nonResidentFlag], 0
        mov     dword [esi+sizeWithoutHeader], 0
        mov     dword [esi+attributeOffset], 18h
        add     esi, eax
        xor     edi, edi
        sub     esp, 16
@@:
        call    ntfs_decode_mcb_entry
        jnc     @f
        cmp     dword[esp+8], 0
        jz      @b
        add     edi, [esp+8]
        mov     ebx, [esp]
        call    ntfsSpaceFree
        jnc     @b
@@:
        add     esp, 16
        mov     [ebp+NTFS.fileDataSize], 0
        ret

ntfsSpaceClean:
; clean up to 16 Mb of disk space
;   in:
; [ebp+NTFS.fileDataStart] = block to clean
; [ebp+NTFS.fileDataSize] = block size
        mov     eax, [ebp+NTFS.fileDataSize]
        test    eax, eax
        jz      @f
        mul     [ebp+NTFS.sectors_per_cluster]
        cmp     eax, 8001h
        jnc     @f
        push    eax
        shl     eax, 9
        stdcall kernel_alloc, eax
        pop     ecx
        test    eax, eax
        jz      @f
        push    ecx
        shl     ecx, 7
        mov     edi, eax
        mov     ebx, eax
        xor     eax, eax
        rep stosd
        mov     eax, [ebp+NTFS.fileDataStart]
        mul     [ebp+NTFS.sectors_per_cluster]
        mov     [ebp+NTFS.LastRead], eax
        pop     ecx
        call    fs_write64_app
        stdcall kernel_free, ebx
@@:
        ret

ntfsSpaceAlloc:
; allocate disk space
;   in:
; edi = offset in bitmap to start search from
; [ebp+NTFS.fileDataSize] = block size in clusters
;   out:
; [ebp+NTFS.fileDataStart] = allocated block starting cluster
; CF=1 -> disk full
        push    eax
        mov     ecx, [ebp+NTFS.BitmapBuffer]
        add     edi, ecx
        add     ecx, [ebp+NTFS.BitmapSize]
        sub     ecx, edi
        jnc     @f
        call    bitmapBuffering
        shl     ecx, 2
@@:
        shr     ecx, 2
        mov     eax, [ebp+NTFS.fileDataSize]
        shr     eax, 5
        jz      .small
        mov     ebx, eax    ; bitmap dwords
.start:
        mov     ecx, [ebp+NTFS.BitmapBuffer]
        add     ecx, [ebp+NTFS.BitmapSize]
        sub     ecx, edi
        shr     ecx, 2
@@:
        xor     eax, eax
        repnz scasd         ; search for empty dword
        jz      @f
        call    bitmapBuffering
        jmp     @b
@@:
        cmp     ecx, ebx
        jnc     @f
        call    bitmapBuffering
        jmp     @b
@@:
        sub     edi, 4
        mov     ecx, ebx
        mov     esi, edi
        xor     eax, eax
        repz scasd          ; check following dwords
        jnz     .start
        sub     esi, 4
        mov     eax, [esi]
        xor     edx, edx
        bsr     edx, eax
        inc     edx
        push    edx         ; starting bit
        push    esi         ; starting dword
        add     esi, 4
        neg     edx
        add     edx, 32
        mov     eax, [ebp+NTFS.fileDataSize]
        sub     eax, edx
        mov     edx, eax
        shr     eax, 5
        shl     eax, 2
        add     esi, eax
        mov     eax, [esi]
        bsf     ecx, eax    ; check last dword
        jz      .done
        and     edx, 31
        cmp     ecx, edx
        jnc     .done
        add     esp, 8
        jmp     .start

.small:     ; less than 32 clusters
        mov     eax, -1
        repz scasd          ; search for zero bits
        test    ecx, ecx
        jnz     @f
        call    bitmapBuffering
        jmp     .small
@@:
        sub     edi, 4
        mov     eax, [edi]
        not     eax
@@:
        bsf     ebx, eax    ; first 0
        jz      .again
        not     eax
        shr     eax, cl
        shl     eax, cl
        bsf     edx, eax    ; next 1
        jz      @f
        sub     edx, ebx
        cmp     edx, [ebp+NTFS.fileDataSize]
        jnc     .got        ; fits inside
        bsf     ebx, eax
        not     eax
        shr     eax, cl
        shl     eax, cl
        jmp     @b
@@:         ; next dword
        mov     eax, [edi+4]
        bsf     edx, eax
        jz      .got        ; empty
        add     edx, 32
        sub     edx, ebx
        cmp     edx, [ebp+NTFS.fileDataSize]
        jnc     .got        ; share between dwords
.again:
        add     edi, 4
        jmp     .small

.got:
        push    ebx         ; starting bit
        push    edi         ; starting dword
.done:      ; mark space
        mov     ecx, [esp+4]
        cmp     ecx, 32
        jc      @f
        xor     ecx, ecx
        add     dword [esp], 4
        mov     [esp+4], ecx
@@:
        mov     edi, [esp]
        xor     eax, eax
        dec     eax
        shr     eax, cl
        shl     eax, cl
        neg     ecx
        add     ecx, 32
        sub     ecx, [ebp+NTFS.fileDataSize]
        jc      @f
        shl     eax, cl     ; fits inside dword
        shr     eax, cl
        or      [edi], eax
        jmp     .end

@@:
        or      [edi], eax
        neg     ecx
        push    ecx
        shr     ecx, 5
        add     edi, 4
        xor     eax, eax
        dec     eax
        rep stosd
        pop     ecx
        and     ecx, 31
        shr     eax, cl
        shl     eax, cl
        not     eax
        or      [edi], eax
.end:
        pop     eax
        pop     ecx
        sub     eax, [ebp+NTFS.BitmapBuffer]
        shl     eax, 3
        add     eax, ecx
        pop     ecx
        mov     ecx, [ebp+NTFS.fileDataSize]
        mov     [ebp+NTFS.fileDataStart], eax
        add     ecx, eax
        add     ecx, 4095
        shr     ecx, 3+9
        shr     eax, 3+9
        sub     ecx, eax
        mov     ebx, eax
        shl     ebx, 9
        add     eax, [ebp+NTFS.BitmapLocation]
        add     ebx, [ebp+NTFS.BitmapBuffer]
        xor     edx, edx
        jmp     fs_write64_app

ntfsSpaceFree:
; free disk space
;   in:
; edi = starting cluster
; ebx = size in clusters
        mov     eax, edi
        add     eax, ebx
        shr     eax, 3
        inc     eax
        cmp     eax, [ebp+NTFS.BitmapSize]
        jc      @f
        add     eax, [ebp+NTFS.BitmapBuffer]
        push    edi
        mov     edi, eax
        call    bitmapBuffering
        pop     edi
@@:
        push    edi
        mov     ecx, edi
        shr     edi, 5
        shl     edi, 2
        add     edi, [ebp+NTFS.BitmapBuffer]
        and     ecx, 31
        xor     eax, eax
        dec     eax
        shr     eax, cl
        shl     eax, cl
        neg     ecx
        add     ecx, 32
        sub     ecx, ebx
        jc      @f
        shl     eax, cl     ; fits inside dword
        shr     eax, cl
        not     eax
        and     [edi], eax
        jmp     .writeBitmap

@@:
        not     eax
        and     [edi], eax
        neg     ecx
        push    ecx
        shr     ecx, 5
        add     edi, 4
        xor     eax, eax
        rep stosd
        pop     ecx
        and     ecx, 31
        dec     eax
        shr     eax, cl
        shl     eax, cl
        and     [edi], eax
.writeBitmap:
        pop     eax
        mov     edi, eax
        lea     ecx, [eax+ebx+4095]
        shr     eax, 3+9
        shr     ecx, 3+9
        sub     ecx, eax
        mov     ebx, eax
        shl     ebx, 9
        add     eax, [ebp+NTFS.BitmapLocation]
        add     ebx, [ebp+NTFS.BitmapBuffer]
        xor     edx, edx
        jmp     fs_write64_app

bitmapBuffering:
; Extend BitmapBuffer and read next 32kb of bitmap
; Warning: $Bitmap fragmentation is not foreseen
; in: edi -> position in bitmap buffer
; out: ecx = number of buffered dwords left
        push    ebx
        mov     eax, [ebp+NTFS.BitmapTotalSize]
        cmp     eax, [ebp+NTFS.BitmapSize]
        jz      .end
        stdcall alloc_pages, 8
        test    eax, eax
        jz      .end
        add     eax, 3
        mov     ebx, [ebp+NTFS.BitmapBuffer]
        add     ebx, [ebp+NTFS.BitmapSize]
        push    ebx
        mov     ecx, 8
        call    commit_pages
        mov     eax, [ebp+NTFS.BitmapSize]
        shr     eax, 9
        add     eax, [ebp+NTFS.BitmapLocation]
        pop     ebx
        mov     ecx, 64
        xor     edx, edx
        call    fs_read64_app
        test    eax, eax
        jnz     .err
        add     [ebp+NTFS.BitmapSize], 8000h
        mov     eax, [ebp+NTFS.BitmapTotalSize]
        cmp     eax, [ebp+NTFS.BitmapSize]
        jnc     @f
        mov     [ebp+NTFS.BitmapSize], eax
@@:
        pop     ebx
        mov     ecx, [ebp+NTFS.BitmapBuffer]
        add     ecx, [ebp+NTFS.BitmapSize]
        sub     ecx, edi
        jc      bitmapBuffering
        shr     ecx, 2
        ret

.err:
        mov     eax, [ebp+NTFS.BitmapBuffer]
        add     eax, [ebp+NTFS.BitmapSize]
        mov     ecx, 8
        call    release_pages
.end:
        add     esp, 12     ; ret
        stc
        ret

;----------------------------------------------------------------
ntfs_WriteFile:
        cmp     byte [esi], 0
        jnz     @f
        xor     ebx, ebx
        movi    eax, ERROR_ACCESS_DENIED
        ret
@@:
        call    ntfs_lock
        stdcall ntfs_find_lfn, [esp+4]
        jc      ntfsNotFound
        cmp     [ebp+NTFS.cur_iRecord], 16
        jc      ntfsDenied
        bt      dword [eax+fileFlags], 28
        jc      ntfsDenied
        cmp     [ebp+NTFS.fragmentCount], 1
        jnz     ntfsUnsupported     ; record fragmented
; edit directory node
        mov     edi, [ebp+NTFS.cur_index_buf]
        cmp     dword [edi], 'INDX'
        jz      @f
        mov     esi, [ebp+NTFS.frs_buffer]
        mov     ecx, [esi+recordRealSize]
        shr     ecx, 2
        rep movsd
        mov     esi, [ebp+NTFS.attr_offs]
        mov     cl, [esi+attributeOffset]
        sub     esi, [ebp+NTFS.frs_buffer]
        add     eax, ecx
        add     eax, esi
@@:
        mov     ecx, [ebx+4]
        mov     edx, [ebx+8]
        add     ecx, [ebx+12]
        adc     edx, 0
        mov     [eax+fileRealSize], ecx
        mov     [eax+fileRealSize+4], edx
        mov     eax, [ebp+NTFS.LastRead]
        mov     [ebp+NTFS.nodeLastRead], eax
        mov     [ebp+NTFS.cur_attr], 0x80
        mov     [ebp+NTFS.cur_offs], 0
        mov     [ebp+NTFS.cur_size], 0
        call    ntfs_read_attr
        jc      ntfsFail
        mov     eax, ecx
        mov     ecx, [ebp+NTFS.frs_buffer]
        cmp     word [ecx+baseRecordReuse], 0
        jnz     ntfsUnsupported     ; auxiliary record
        mov     ecx, [ebp+NTFS.attr_offs]
        cmp     word [ecx+attributeFlags], 0
        jnz     ntfsUnsupported
        push    ebx
        cmp     byte [ecx+nonResidentFlag], 0
        jz      .resizeAttribute
        cmp     edx, [ecx+attributeRealSize+4]
        jc      .writeNode
        jnz     .resizeAttribute
        cmp     [ecx+attributeRealSize], eax
        jnc     .writeNode
.resizeAttribute:
        call    resizeAttribute
        jc      ntfsErrorPop
        mov     ecx, [ebp+NTFS.attr_offs]
        cmp     byte [ecx+nonResidentFlag], 1
        jz      @f
        mov     ebx, [esp]
        movzx   edi, byte [ecx+attributeOffset]
        add     edi, ecx
        add     edi, [ebx+4]
        mov     ecx, [ebx+12]
        mov     esi, [ebx+16]
        rep movsb
@@:
        mov     eax, [ebp+NTFS.frs_buffer]
        mov     [ebp+NTFS.cur_buf], eax
        call    writeRecord     ; file
        mov     ebx, [ebp+NTFS.frs_buffer]
        call    ntfs_restore_usa_frs
.writeNode:
        mov     eax, [ebp+NTFS.nodeLastRead]
        mov     [ebp+NTFS.LastRead], eax
        mov     eax, [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    writeRecord     ; directory
        pop     ebx
        mov     ecx, [ebp+NTFS.attr_offs]
        cmp     byte [ecx+nonResidentFlag], 0
        jz      .done
        mov     ecx, [ebx+12]
        test    ecx, ecx
        jz      .done
        mov     eax, [ebx+4]
        mov     edx, [ebx+8]
        mov     esi, [ebx+16]
        shrd    eax, edx, 9
        test    dword[ebx+4], 1FFh
        jz      .aligned
        mov     [ebp+NTFS.cur_offs], eax
        mov     [ebp+NTFS.cur_size], 1
        lea     edi, [ebp+NTFS.bitmap_buf]
        mov     [ebp+NTFS.cur_buf], edi
        call    ntfs_read_attr.continue
        jc      ntfsDevice
        mov     eax, [ebx+4]
        and     eax, 1FFh
        add     edi, eax
        sub     eax, [ebp+NTFS.cur_read]
        neg     eax
        push    ecx
        cmp     ecx, eax
        jb      @f
        mov     ecx, eax
@@:
        sub     [esp], ecx
        rep movsb
        push    ebx
        mov     eax, [ebp+NTFS.LastRead]
        lea     ebx, [ebp+NTFS.bitmap_buf]
        mov     ecx, 1
        xor     edx, edx
        call    fs_write64_app
        pop     ebx
        pop     ecx
        test    ecx, ecx
        jz      .done
        mov     eax, [ebx+4]
        mov     edx, [ebx+8]
        shrd    eax, edx, 9
        inc     eax
.aligned:
        push    ecx
        shr     ecx, 9
        mov     [ebp+NTFS.cur_offs], eax
        mov     [ebp+NTFS.cur_size], ecx
        mov     [ebp+NTFS.cur_buf], esi
        add     eax, ecx
        push    eax
        mov     [ebp+NTFS.bWriteAttr], 1
        call    ntfs_read_attr.continue
        mov     [ebp+NTFS.bWriteAttr], 0
        pop     [ebp+NTFS.cur_offs]
        pop     ecx
        jc      ntfsDevice
        and     ecx, 1FFh
        jz      .done
        add     esi, [ebp+NTFS.cur_read]
        mov     [ebp+NTFS.cur_size], 1
        lea     edi, [ebp+NTFS.bitmap_buf]
        mov     [ebp+NTFS.cur_buf], edi
        call    ntfs_read_attr.continue
        jc      ntfsDevice
        rep movsb
        push    ebx
        mov     eax, [ebp+NTFS.LastRead]
        lea     ebx, [ebp+NTFS.bitmap_buf]
        mov     ecx, 1
        xor     edx, edx
        call    fs_write64_app
        pop     ebx
.done:
        mov     ebx, [ebx+12]
        jmp     ntfsDone

;----------------------------------------------------------------
ntfs_Delete:
        cmp     byte [esi], 0
        jnz     @f
        xor     ebx, ebx
        movi    eax, ERROR_ACCESS_DENIED
        ret
@@:
        call    ntfs_lock
        stdcall ntfs_find_lfn, [esp+4]
        jc      ntfsNotFound
        cmp     [ebp+NTFS.cur_iRecord], 16
        jc      ntfsDenied
        cmp     [ebp+NTFS.fragmentCount], 1
        jnz     ntfsUnsupported     ; record fragmented
        test    byte [eax+indexFlags], 1
        jnz     ntfsUnsupported     ; index has a subnode
        mov     edx, [ebp+NTFS.cur_iRecord]
        shr     edx, 3
        cmp     edx, [ebp+NTFS.mftBitmapSize]
        jnc     ntfsUnsupported
; delete index from the node
        movzx   edx, word [eax+indexAllocatedSize]
        mov     ecx, [eax+fileRecordReference]
        cmp     [eax+edx+fileRecordReference], ecx
        jnz     @f
        add     dx, [eax+edx+indexAllocatedSize]
@@:
        mov     edi, [ebp+NTFS.cur_index_buf]
        cmp     dword [edi], 'INDX'
        jz      .indexRecord
        mov     esi, [ebp+NTFS.frs_buffer]  ; indexRoot
        mov     ecx, [esi+recordRealSize]
        shr     ecx, 2
        rep movsd
        mov     esi, [ebp+NTFS.cur_index_buf]
        mov     edi, [ebp+NTFS.attr_offs]
        sub     edi, [ebp+NTFS.frs_buffer]
        add     edi, esi
        sub     [edi+sizeWithHeader], edx
        sub     [edi+sizeWithoutHeader], edx
        mov     cl, [edi+attributeOffset]
        add     edi, ecx
        sub     [edi+rootNode+nodeRealSize], edx
        sub     [edi+rootNode+nodeAllocatedSize], edx
        sub     eax, esi
        add     eax, edi
        sub     [esi+recordRealSize], edx
        mov     ecx, [esi+recordRealSize]
        jmp     @f

.indexRecord:
        add     edi, recordNode+nodeRealSize
        sub     [edi], edx
        mov     ecx, [edi]
        add     ecx, recordNode
@@:
        add     ecx, [ebp+NTFS.cur_index_buf]
        sub     ecx, eax
        shr     ecx, 2
        mov     esi, eax
        add     esi, edx
        mov     edi, eax
        rep movsd
        mov     eax, [ebp+NTFS.LastRead]
        mov     [ebp+NTFS.nodeLastRead], eax
; examine file record
        mov     [ebp+NTFS.cur_attr], 0x80
        mov     [ebp+NTFS.cur_offs], 0
        mov     [ebp+NTFS.cur_size], 0
        call    ntfs_read_attr
        jc      .folder
        mov     esi, [ebp+NTFS.frs_buffer]
        cmp     word [esi+baseRecordReuse], 0
        jnz     ntfsUnsupported     ; auxiliary record
        mov     esi, [ebp+NTFS.attr_offs]
        cmp     byte [esi+nonResidentFlag], 0
        jz      .writeBitmapMFT
        movzx   eax, byte [esi+dataRunsOffset]
        add     esi, eax
        xor     edi, edi
        sub     esp, 16
@@:         ; "delete" file data
        call    ntfs_decode_mcb_entry
        jnc     @f
        cmp     dword[esp+8], 0
        jz      @b
        add     edi, [esp+8]
        mov     ebx, [esp]
        call    ntfsSpaceFree
        jnc     @b
@@:
        add     esp, 16
        jmp     .writeBitmapMFT

.folder:    ; empty?
        lea     esi, [ebp+NTFS.bitmap_buf]
        mov     [ebp+NTFS.cur_buf], esi
        mov     [ebp+NTFS.cur_attr], 0x90
        mov     [ebp+NTFS.cur_offs], 0
        mov     [ebp+NTFS.cur_size], 1
        call    ntfs_read_attr
        cmp     [ebp+NTFS.cur_read], 48
        jnz     ntfsDenied
        test    byte [esi+32+indexFlags], 1
        jnz     ntfsDenied
.writeBitmapMFT:    ; "delete" file record
        mov     eax, [ebp+NTFS.cur_iRecord]
        mov     ecx, eax
        shr     eax, 3
        and     ecx, 7
        mov     edi, [ebp+NTFS.mftBitmapBuffer]
        btr     [edi+eax], ecx
        shr     eax, 9
        mov     ebx, eax
        shl     ebx, 9
        add     eax, [ebp+NTFS.mftBitmapLocation]
        add     ebx, edi
        mov     ecx, 1
        xor     edx, edx
        call    fs_write64_sys
        mov     esi, [ebp+NTFS.frs_buffer]
        mov     [ebp+NTFS.cur_buf], esi
        mov     byte [esi+recordFlags], 0
        call    writeRecord
; write directory node
        mov     eax, [ebp+NTFS.nodeLastRead]
        mov     [ebp+NTFS.LastRead], eax
        mov     eax, [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    writeRecord
        jmp     ntfsDone

;----------------------------------------------------------------
ntfs_SetFileEnd:
        cmp     byte [esi], 0
        jnz     @f
        xor     ebx, ebx
        movi    eax, ERROR_ACCESS_DENIED
        ret
@@:
        call    ntfs_lock
        stdcall ntfs_find_lfn, [esp+4]
        jc      ntfsNotFound
        cmp     [ebp+NTFS.cur_iRecord], 16
        jc      ntfsDenied
        bt      dword [eax+fileFlags], 28
        jc      ntfsDenied
        cmp     [ebp+NTFS.fragmentCount], 1
        jnz     ntfsUnsupported     ; record fragmented
; edit directory node
        mov     edi, [ebp+NTFS.cur_index_buf]
        cmp     dword [edi], 'INDX'
        jz      @f
        mov     esi, [ebp+NTFS.frs_buffer]
        mov     ecx, [esi+recordRealSize]
        shr     ecx, 2
        rep movsd
        mov     esi, [ebp+NTFS.attr_offs]
        mov     cl, [esi+attributeOffset]
        sub     esi, [ebp+NTFS.frs_buffer]
        add     eax, ecx
        add     eax, esi
@@:
        mov     ecx, [ebx+4]
        mov     edx, [ebx+8]
        mov     [eax+fileRealSize], ecx
        mov     [eax+fileRealSize+4], edx
        mov     eax, [ebp+NTFS.LastRead]
        mov     [ebp+NTFS.nodeLastRead], eax
        mov     [ebp+NTFS.cur_attr], 0x80
        mov     [ebp+NTFS.cur_offs], 0
        mov     [ebp+NTFS.cur_size], 0
        call    ntfs_read_attr
        jc      ntfsFail
        mov     eax, ecx
        mov     ecx, [ebp+NTFS.frs_buffer]
        cmp     word [ecx+baseRecordReuse], 0
        jnz     ntfsUnsupported     ; auxiliary record
        mov     ecx, [ebp+NTFS.attr_offs]
        cmp     word [ecx+attributeFlags], 0
        jnz     ntfsUnsupported
        cmp     byte [ecx+nonResidentFlag], 0
        jz      .resizeAttribute
        cmp     [ecx+attributeRealSize+4], edx
        jnz     .resizeAttribute
        cmp     [ecx+attributeRealSize], eax
        jnc     .resizeAttribute
        mov     eax, [ecx+attributeRealSize]
        mov     ecx, [ebp+NTFS.sectors_per_cluster]
        mov     [ebp+NTFS.cur_size], ecx
        shl     ecx, 9
        div     ecx
        test    edx, edx
        jz      .aligned
        push    edx
        push    ecx
        mul     [ebp+NTFS.sectors_per_cluster]
        mov     [ebp+NTFS.cur_offs], eax
        stdcall kernel_alloc, ecx
        pop     ecx
        pop     edi
        sub     ecx, edi
        add     edi, eax
        mov     [ebp+NTFS.cur_buf], eax
        push    [ebp+NTFS.LastRead]
        call    ntfs_read_attr.continue
        jc      @f
        xor     eax, eax
        rep stosb
        push    ebx
        mov     eax, [ebp+NTFS.LastRead]
        mov     ebx, [ebp+NTFS.cur_buf]
        mov     ecx, [ebp+NTFS.sectors_per_cluster]
        xor     edx, edx
        call    fs_write64_app
        pop     ebx
@@:
        pop     [ebp+NTFS.LastRead]
        stdcall kernel_free, [ebp+NTFS.cur_buf]
.aligned:
        mov     eax, [ebx+4]
        mov     edx, [ebx+8]
.resizeAttribute:
        call    resizeAttribute
        jc      ntfsError
        mov     eax, [ebp+NTFS.frs_buffer]
        mov     [ebp+NTFS.cur_buf], eax
        call    writeRecord     ; file
        mov     eax, [ebp+NTFS.nodeLastRead]
        mov     [ebp+NTFS.LastRead], eax
        mov     eax, [ebp+NTFS.cur_index_buf]
        mov     [ebp+NTFS.cur_buf], eax
        call    writeRecord     ; directory
        call    ntfsSpaceClean
        jmp     ntfsDone

;----------------------------------------------------------------
ntfs_SetFileInfo:
        movi    eax, ERROR_UNSUPPORTED_FS
        ret

;----------------------------------------------------------------
ntfs_GetFileInfo:
        cmp     byte [esi], 0
        jnz     @f
        movi    eax, ERROR_UNSUPPORTED_FS
        ret
@@:
        call    ntfs_lock
        stdcall ntfs_find_lfn, [esp+4]
        jnc     .found
        test    eax, eax
        jz      ntfsFail
        jmp     ntfsNotFound
.found:
        push    esi edi
        mov     esi, eax
        mov     edi, [ebx+16]
        xor     eax, eax
        call    ntfs_direntry_to_bdfe
        pop     edi esi
        call    ntfs_unlock
        xor     eax, eax
        ret

ntfsUnsupported:
        push    ERROR_UNSUPPORTED_FS
        jmp     ntfsOut
ntfsDevice:
        push    ERROR_DEVICE
        jmp     ntfsOut
ntfsNotFound:
        push    ERROR_FILE_NOT_FOUND
        jmp     ntfsOut
ntfsDenied:
        push    ERROR_ACCESS_DENIED
        jmp     ntfsOut
ntfsFail:
        push    ERROR_FS_FAIL
        jmp     ntfsOut
ntfsDiskFull:
        push    ERROR_DISK_FULL
        jmp     ntfsOut
ntfsErrorPop2:
        pop     ebx
ntfsErrorPop:
        pop     ebx
ntfsError:
        push    eax
ntfsOut:
        call    ntfs_unlock
        xor     ebx, ebx
        pop     eax
        ret