Subversion Repositories Kolibri OS

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;;                                                              ;;

;; Copyright (C) KolibriOS team 2004-2016. All rights reserved. ;;

;;  Distributed under terms of the GNU General Public License.  ;;

;;                                                              ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

$Revision: 9045 $

ERROR_SUCCESS        = 0

ERROR_DISK_BASE      = 1

ERROR_UNSUPPORTED_FS = 2

ERROR_UNKNOWN_FS     = 3

ERROR_PARTITION      = 4

ERROR_FILE_NOT_FOUND = 5

ERROR_END_OF_FILE    = 6

ERROR_MEMORY_POINTER = 7

ERROR_DISK_FULL      = 8

ERROR_FS_FAIL        = 9

ERROR_ACCESS_DENIED  = 10

ERROR_DEVICE         = 11

maxPathLength = 1000h

image_of_eax EQU esp+32

image_of_ebx EQU esp+20

; ; System function 70 security check

; align 4

; proc file_system_is_operation_safe stdcall, inf_struct_ptr: dword

; ; in:

; ;      inf_struct_ptr = pointer to information structure was given to sysfn70

; ; out: ZF = 1 if operation is safe

; ;      ZF = 0 if operation can cause kernel crash

;         push    ebx ecx edx

;         xor     ecx, ecx ; ecx - length of target buffer

;         mov     ebx, [inf_struct_ptr]

;         mov     edx, [ebx + 16] ; base of target buffer

;         cmp     dword [ebx], 0 ; if 70.0

;         jnz     .case1

;         mov     ecx, dword [ebx + 12]

;         jmp     .end_switch

; .case1:

;         cmp     dword [ebx], 1 ; if 70.1

;         jnz     .case2_3

;         ;mov     ecx, 32

;         cmp     dword [ebx + 8], 1 ; check encoding

;         jbe     .case1_304 ; if encdoing <= 1 i.e cpp866

;         mov     ecx, 560 ; if unicode then bdvk block len is 560 bytes

;         jmp     .case1_end

; .case1_304:

;         mov     ecx, 304 ; if cp866 then bdvk block len is 304 bytes

; .case1_end:

;         imul    ecx, dword [ebx + 12] ; multiply bdvk length by their count

;         add     ecx, 32 ; add result header len

;         jmp     .end_switch

; .case2_3:

;         cmp     dword [ebx], 3

;         ja      .case5 ; if subfn > 3

;         mov     ecx, dword [ebx + 12]

;         jmp     .end_switch

; .case5:

;         cmp     dword [ebx], 5

;         jnz     .case6

;         mov     ecx, 40

;         jmp     .end_switch

; .case6:

;         cmp     dword [ebx], 6

;         jnz     .switch_none

;         mov     ecx, 32

;         jmp     .end_switch

; .switch_none:

;         mov     ecx, 1

;         test    ecx, ecx

;         jmp     .ret

; .end_switch:

;         ;;

;         stdcall is_region_userspace, edx, ecx

; .ret:

;         pop     edx ecx ebx

;         ret

; endp

; syscall_fileSystemUnicode: ; with user pointer correctness checking

; ; in: ebx -> f.80 parameter structure

;         stdcall file_system_is_operation_safe, ebx

;         jz      @f

;         DEBUGF  1, "sysfn80 addr error\n"

;         mov     dword [image_of_eax], ERROR_MEMORY_POINTER

;         ret

; @@:

;         jmp     fileSystemUnicode

; temporarily commented out cause acpi driver (drivers/devman) uses sysfn70 via 0x40

; so because drivers it kernel space, pointer checking fails

; TODO solution: add filesystem functions without pointer checking to kernel exports

; and make the driver use them, not int 0x40

; syscall_fileSystemUnicode commented out for the same reason

; syscall_file_system_lfn: ; with user pointer correctness checking

; ; in: ebx -> f.70 parameter structure

;         stdcall file_system_is_operation_safe, ebx

;         jz      @f

;         DEBUGF  1, "sysfn70 addr error\n"

;         mov     dword [image_of_eax], ERROR_MEMORY_POINTER

;         ret

; @@:

;         jmp     file_system_lfn

; System function 70

file_system_lfn_protected:

        pushad

        call    protect_from_terminate

        call    file_system_lfn

        call    unprotect_from_terminate

        popad

        mov     [image_of_eax], eax

        mov     [image_of_ebx], ebx

        ret

fileSystemUnicode:

; in: ebx -> f.80 parameter structure

        mov     edi, [ebx+20]

        mov     esi, [ebx+24]

        jmp     @f

file_system_lfn:

; in: ebx -> f.70 parameter structure

        xor     edi, edi

        lea     esi, [ebx+20]

        cmp     byte [esi], 0

        jnz     @f

        mov     esi, [ebx+21]

@@:

        cmp     word [esi], '/'

        jnz     @f

        cmp     edi, 2

        jnz     .rootdir

        cmp     dword[esi], '/'

        jz      .rootdir

@@:

        stdcall kernel_alloc, maxPathLength

        push    eax ebx

        xchg    eax, edi

        call    getFullPath

        pop     ebx ebp

        test    eax, eax

        jz      .notfound

        cmp     dword[ebx], 7   ; start application

        jnz     @f

        mov     edx, [ebx+4]

        mov     ecx, [ebx+8]

        mov     ebx, ebp

        call    fs_execute

        mov     [image_of_eax], eax

        ret

@@:

        lea     esi, [ebp+2]

        mov     ax, [esi]

        or      ax, 2020h

        cmp     ax, 'cd'

        jz      .CD

        call    dyndisk_handler ; not returns if success

.notfound:

        stdcall kernel_free, ebp

        mov     dword[image_of_eax], ERROR_FILE_NOT_FOUND

        ret

.CD:

        add     esi, 2

        xor     eax, eax

        lodsb       ; disk number

        sub     eax, '0'

        cmp     eax, 10

        jnc     .notfound

        mov     edi, eax

        lodsb

        test    eax, eax

        jz      .maindir

        cmp     al, '/'

        jnz     .notfound

        lodsb       ; partition number

        test    eax, eax

        jz      .maindir

        cmp     al, '1'

        jnz     .notfound

        cmp     byte [esi], '/'

        jnz     @f

        inc     esi

@@:

        call    reserve_cd

        mov     eax, edi

        bt      eax, 0

        setc    [DiskNumber]

        bt      eax, 1

        setc    [ChannelNumber]

        inc     [ChannelNumber]

        inc     eax

        mov     [cdpos], eax

        call    reserve_cd_channel

        mov     eax, edi

        not     eax

        and     eax, 3

        shl     eax, 1

        inc     eax

        shr     edi, 2

        mov     dword[image_of_eax], ERROR_FILE_NOT_FOUND

        bt      [edi*5+DRIVE_DATA+1], ax

        jnc     @f

        mov     ecx, [ebx+12]

        mov     edx, [ebx+16]

        mov     eax, [ebx]

        mov     dword[image_of_eax], ERROR_UNSUPPORTED_FS

        cmp     eax, fs_NumCdServices

        jae     @f

        add     ebx, 4

        push    ebp

        call    dword[fs_CdServices + eax*4]

        pop     ebp

        mov     [image_of_eax], eax

        mov     [image_of_ebx], ebx

@@:

        call    free_cd_channel

        and     [cd_status], 0

        stdcall kernel_free, ebp

        ret

.nextCD:

        test    eax, eax    ; partition number

        jnz     @f

        inc     eax     ; /cdX/1

        ret

@@:

        stc

        ret

.maindir:   ; list partitions

        mov     esi, .nextCD

        xor     ecx, ecx

.maindir_noesi:     ; backjump from dyndisk_handler

        push    ebp

        mov     ebp, ecx

        call    kernel_free

        mov     edi, [ebx+16]   ; buffer

        cmp     byte [ebx], 5

        jz      .deviceInfo

        cmp     byte [ebx], 1   ; read folder?

        jnz     .access_denied

        push    ebp

        pushd   [ebx+4]         ; first block

        mov     ebp, [ebx+12]   ; the number of blocks to read

        mov     ebx, [ebx+8]    ; flags

        mov     ecx, 32/4

        mov     edx, edi

        xor     eax, eax

        rep stosd

        mov     byte [edx], 1   ; version

.maindir_loop:

        call    esi

        jc      .maindir_done

        inc     dword[edx+8]

        dec     dword[esp]

        jns     .maindir_loop

        dec     ebp

        js      .maindir_loop

        inc     dword[edx+4]

        mov     dword[edi], 16      ; attributes: folder

        mov     dword[edi+4], ebx   ; name encoding

        push    eax

        mov     ecx, 32/4

        add     edi, 8

        xor     eax, eax

        rep stosd

        pop     eax

        push    eax edx edi

; convert number in eax to decimal string

        push    -'0'

        mov     ecx, 10

@@:

        xor     edx, edx

        div     ecx

        push    edx

        test    eax, eax

        jnz     @b

        cmp     ebx, 2

        jz      .uni

@@:

        pop     eax

        add     eax, '0'

        stosb

        test    eax, eax

        jnz     @b

        pop     edi edx eax

        cmp     ebx, 3

        jz      @f

        add     edi, 264

        jmp     .maindir_loop

.uni:

        pop     eax

        add     eax, '0'

        stosw

        test    eax, eax

        jnz     .uni

        pop     edi edx eax

@@:

        add     edi, 520

        jmp     .maindir_loop

.maindir_done:

        pop     eax eax

        mov     ebx, [edx+4]

        xor     eax, eax

        dec     ebp

        js      @f

        mov     al, ERROR_END_OF_FILE

@@:

        mov     [image_of_eax], eax

        mov     [image_of_ebx], ebx

        ret

.access_denied:

        mov     dword[image_of_eax], ERROR_ACCESS_DENIED

        ret

.deviceInfo:

        test    ebp, ebp

        jz      @f

        mov     eax, dword[ebp+DISK.MediaInfo.Capacity]

        mov     edx, dword[ebp+DISK.MediaInfo.Capacity+4]

        shld    edx, eax, 9

        shl     eax, 9

        mov     [edi+36], edx

        mov     [edi+32], eax

@@:

        and     dword[image_of_eax], 0

        ret

.rootdir:   ; / - virtual root folder

        cmp     byte [ebx], 5

        jz      @b

        cmp     byte [ebx], 1   ; read folder?

        jnz     .access_denied

        mov     ebp, [ebx+12]   ; number of blocks

        mov     edx, [ebx+16]   ; return area

        push    dword[ebx+4]    ; first block

        mov     ebx, [ebx+8]    ; flags

        mov     ecx, 32/4

        mov     edi, edx

        xor     eax, eax

        rep stosd

        mov     byte [edx], 1   ; version

        sub     esp, 16

.rootdir_loop:

        push    edi

        lea     edi, [esp+4]

        call    dyndisk_enum_root

        pop     edi

        test    eax, eax

        jz      .rootdirCD

        inc     dword[edx+8]

        dec     dword[esp+16]

        jns     .rootdir_loop

        dec     ebp

        js      .rootdir_loop

        inc     dword[edx+4]

        mov     dword[edi], 16      ; attributes: folder

        mov     dword[edi+4], ebx   ; name encoding

        push    eax

        mov     ecx, 32/4

        add     edi, 8

        xor     eax, eax

        rep stosd

        push    edi

        lea     esi, [esp+8]

        cmp     ebx, 2

        jz      .uni2

@@:

        lodsb

        stosb

        test    eax, eax

        jnz     @b

        pop     edi eax

        cmp     ebx, 3

        jz      @f

        add     edi, 264

        jmp     .rootdir_loop

.uni2:

        lodsb

        stosw

        test    eax, eax

        jnz     .uni2

        pop     edi eax

@@:

        add     edi, 520

        jmp     .rootdir_loop

.rootdirCD:

        add     esp, 16

        or      esi, -1

.rootdirCD_loop:

        inc     esi

        cmp     esi, 10

        jnc     .rootdir_done

        mov     eax, esi

        not     eax

        and     eax, 3

        shl     eax, 1

        inc     eax

        mov     ecx, esi

        shr     ecx, 2

        bt      [ecx*5+DRIVE_DATA+1], ax

        jnc     .rootdirCD_loop

        inc     dword[edx+8]

        dec     dword[esp]

        jns     .rootdirCD_loop

        dec     ebp

        js      .rootdirCD_loop

        inc     dword[edx+4]

        mov     dword[edi], 16      ; attributes: folder

        mov     dword[edi+4], ebx   ; name encoding

        mov     ecx, 32/4

        add     edi, 8

        xor     eax, eax

        rep stosd

        mov     eax, esi

        add     eax, '0'

        cmp     ebx, 1

        jz      @f

        mov     word [edi], 'cd'

        mov     [edi+2], ax

        add     edi, 264

        jmp     .rootdirCD_loop

@@:

        mov     dword[edi], 640063h

        mov     [edi+4], eax

        add     edi, 520

        jmp     .rootdirCD_loop

.rootdir_done:

        pop     eax

        mov     ebx, [edx+4]

        xor     eax, eax

        dec     ebp

        js      @f

        mov     al, ERROR_END_OF_FILE

@@:

        mov     [image_of_eax], eax

        mov     [image_of_ebx], ebx

        ret

;-----------------------------------------------------------------------------

process_replace_file_name:

; in: [esi] = virtual path

; out: [esi]+[ebp] = physical path

        xor     edi, edi

        xor     ebp, ebp

.loop:

        cmp     edi, [full_file_name_table.size]

        jae     .notfound

        push    esi edi

        shl     edi, 7

        add     edi, [full_file_name_table]

@@:

        cmp     byte [edi], 0

        jz      .dest_done

        lodsb

        test    al, al

        jz      .cont

        scasb

        jz      @b

        or      al, 20h

        cmp     [edi-1], al

        jz      @b

.cont:

        pop     edi esi

        inc     edi

        jmp     .loop

.dest_done:

        cmp     byte [esi], 0

        jz      .found

        cmp     byte [esi], '/'

        jnz     .cont

.found:

        pop     edi eax

        shl     edi, 7

        add     edi, [full_file_name_table]

        mov     ebp, esi

        lea     esi, [edi+64]

.notfound:

        ret

;-----------------------------------------------------------------------------

uglobal

addDirSeal db  ?

endg

sys_current_directory:  ; sysfunction 30

        mov     eax, [current_slot]

        mov     edi, [eax+APPDATA.cur_dir]

        xor     eax, eax

        dec     ebx

        jz      .set

        dec     ebx

        jz      .get

        dec     ebx

        jz      .mount_additional_directory

        mov     eax, edx

        dec     ebx

        jz      .set

        mov     eax, esi

        dec     ebx

        jz      .get

@@:

        ret

.mount_additional_directory:

; in: ecx -> dir name+dir path (128)

        mov     al, 1

        xchg    [addDirSeal], al

        test    al, al

        jnz     @b

        mov     esi, ecx

        mov     edi, sysdir_name1

        mov     ecx, 64

        rep movsb   ; copying fake directory name

        mov     byte [edi-1], 0

        mov     cl, 63

        call    cp866toUTF8_string

        mov     byte [edi], 0

        mov     [full_file_name_table.size], 2

        ret

.get:

; in: ecx -> buffer, edx = length, eax = encoding

        stdcall is_region_userspace, ecx, edx

        jz      @f

        ; if illegal buffer given

        xor     edx, edx

        jmp     .ret

@@:

        mov     esi, edi

        inc     esi

        mov     edi, ecx

        cmp     edx, maxPathLength

        jc      @f

        mov     edx, maxPathLength

@@:

        mov     ecx, edx

        jecxz   .ret

        cmp     eax, 2

        jz      .get16

        cmp     eax, 3

        jz      .get8

@@:

        dec     ecx

        js      @f

        call    utf8to16

        call    uni2ansi_char

        stosb

        test    al, al

        jnz     @b

        sub     edx, ecx

@@:

        mov     byte [edi-1], 0

.ret:

        mov     [esp+32], edx

        ret

.get8:

        push    edi

        mov     edi, esi

        xor     eax, eax

        repnz scasb

        sub     edx, ecx

        mov     ecx, edx

        pop     edi

        rep movsb

        jmp     @b

.get16:

        shr     ecx, 1

        shr     edx, 1

@@:

        dec     ecx

        js      @f

        call    utf8to16

        stosw

        test    ax, ax

        jnz     @b

        sub     edx, ecx

@@:

        shl     edx, 1

        mov     word [edi-2], 0

        jmp     .ret

.set:

        mov     esi, ecx

getFullPath:

; in: esi -> file path, eax = string encoding, edi -> destination

; out: UTF-8 string (with marker), eax = length, 0 -> error

        test    eax, eax

        jnz     @f

        cmp     byte [esi], 4

        jnc     @f

        cmp     byte [esi], 0

        jz      @f

        lodsb

@@:

        cmp     byte [esi], '/'

        jnz     .relative

        cmp     eax, 2

        jnz     @f

        cmp     word [esi], '/'

        jnz     .relative

        inc     esi

        inc     esi

        jmp     .start

@@:

        inc     esi

        cmp     byte [esi], 4

        jnc     .start

        lodsb

        cmp     byte [esi], '/'

        jnz     .start

        inc     esi

.start:

        push    eax edi

        call    process_replace_file_name

        mov     edi, [esp]

        mov     ecx, maxPathLength

        mov     al, 3

        mov     ah, '/'

        stosw

        sub     ecx, 2

        test    ebp, ebp

        jz      .absolute

@@:

        lodsb

        stosb

        dec     ecx

        test    al, al

        jnz     @b

        mov     esi, ebp

        dec     edi

.absolute:

        cmp     byte [esp+4], 2

        jz      .utf16

        cmp     byte [esp+4], 3

        jz      .utf8

        call    cp866toUTF8_string

        jns     .end

        jmp     .fail

.utf8:

        dec     ecx

        js      .fail

        lodsb

        stosb

        test    al, al

        jz      .end

        jmp     .utf8

.utf16:

        call    UTF16to8_string

        jns     .end

.fail:

        mov     byte [edi], 0

        pop     eax eax

        xor     eax, eax

        ret

.relative:

        push    eax edi

        mov     ebx, esi

        mov     edi, [current_slot]

        mov     edi, [edi+APPDATA.cur_dir]

        mov     edx, edi

        mov     ecx, maxPathLength

        xor     eax, eax

        repnz scasb

        mov     esi, edi

        mov     edi, [esp]

        jecxz   .fail

        cmp     byte [ebx], 0

        jz      .set_ok

        dec     esi

        cmp     edx, edi    ; is destination equal to cur_dir?

        mov     edi, esi

        jz      @f

        mov     edi, [esp]

        mov     ecx, esi

        sub     ecx, edx

        mov     esi, edx

        mov     edx, edi

        rep movsb

@@:

        mov     byte [edi], '/'

        inc     edi

        mov     esi, ebx

        mov     ecx, edx

        add     ecx, maxPathLength

        sub     ecx, edi

        jmp     .absolute

.set_ok:

        cmp     edx, edi    ; is destination equal to cur_dir?

        jz      @f

        mov     ecx, esi

        sub     ecx, edx

        mov     esi, edx

        rep movsb

@@:

        pop     eax

        sub     edi, eax

        pop     eax

        mov     eax, edi

        ret

.end:

        or      ecx, -1

        mov     edi, [esp]

        xor     eax, eax

        push    edi

        repnz scasb

        not     ecx

        pop     edi

.parse:

        mov     al, '/'

        repnz scasb

        jecxz   @b

        cmp     byte [edi], '.'

        jnz     .parse

        mov     esi, edi

@@:

        lodsw

        sub     ecx, 2

        cmp     ax, './'

        jz      @b

        cmp     ax, '..'

        jnz     @f

        cmp     byte [esi], '/'

        jnz     @f

        mov     edx, ecx

        mov     ecx, edi

        sub     ecx, [esp]

        sub     ecx, 2

        jc      .fail

        sub     edi, 2

        lodsb

        dec     edx

        std

        repnz scasb

        cld

        add     edi, 2

        mov     ecx, edx

        jmp     @b

@@:

        sub     esi, 2

        add     ecx, 2

        cmp     esi, edi

        jz      .parse

        push    edi ecx

        rep movsb

        pop     ecx edi

        jmp     .parse

include "parse_fn.inc"

include "fs_common.inc"

include "iso9660.inc"   ; read for CD filesystem

include "fat.inc"

include "ntfs.inc"

include "ext.inc"

include "xfs.asm"