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uglobal

cd_current_pointer_of_input    dd  0

cd_current_pointer_of_input_2  dd  0

cd_mem_location                dd  0

cd_counter_block               dd  0

endg

CDDataBuf equ 0x7000

reserve_cd:

    cli

    cmp   [cd_status],0

    je    reserve_ok2

    sti

    call  change_task

    jmp   reserve_hd1

  reserve_ok2:

    push  eax

    mov   eax,[0x3000]

    shl   eax,5

    mov   eax,[eax+0x3000+4]

    mov   [cd_status],eax

    pop   eax

    sti

    ret

cd_status dd 0

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

;

;  fs_CdRead - LFN variant for reading CD disk

;

;  esi  points to filename /dir1/dir2/.../dirn/file,0

;  ebx  pointer to 64-bit number = first wanted byte, 0+

;       may be ebx=0 - start from first byte

;  ecx  number of bytes to read, 0+

;  edx  mem location to return data

;

;  ret ebx = bytes read or 0xffffffff file not found

;      eax = 0 ok read or other = errormsg

;

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

fs_CdRead:

    push    edi

    cmp    byte [esi], 0

    jnz    @f

.noaccess:

    pop    edi

.noaccess_2:

    or    ebx, -1

    mov    eax, ERROR_ACCESS_DENIED

    ret

.noaccess_3:

    pop     eax edx ecx edi

    jmp  .noaccess_2

@@:

    call    cd_find_lfn

    jnc    .found

    pop    edi

    cmp   [DevErrorCode],0

    jne   .noaccess_2

    or    ebx, -1

    mov    eax, ERROR_FILE_NOT_FOUND

    ret

.found:

    mov    edi,[cd_current_pointer_of_input]

    test   byte [edi+25],10b    ; do not allow read directories

    jnz    .noaccess

    test    ebx, ebx

    jz    .l1

    cmp    dword [ebx+4], 0

    jz    @f

        xor     ebx, ebx

.reteof:

    mov    eax, 6 ; end of file

    pop    edi

    ret

@@:

    mov    ebx, [ebx]

.l1:

        push    ecx edx

        push    0

        mov     eax, [edi+10] ; �������� ������ �������� ������

        sub     eax, ebx

        jb      .eof

        cmp     eax, ecx

        jae     @f

        mov     ecx, eax

        mov     byte [esp], 6

@@:

     mov    eax,[edi+2]

     mov    [CDSectorAddress],eax

; now eax=cluster, ebx=position, ecx=count, edx=buffer for data

.new_sector:

    test    ecx, ecx

    jz    .done

    sub    ebx, 2048

    jae    .new_sector

    add    ebx, 2048

    jnz    .incomplete_sector

    cmp    ecx, 2048

    jb    .incomplete_sector

; we may read and memmove complete sector

    mov  [CDDataBuf_pointer],edx

    call ReadCDWRetr      ; ������ ������ �����

    cmp   [DevErrorCode],0

    jne   .noaccess_3

    inc  dword [CDSectorAddress]

    add    edx, 2048

    sub    ecx, 2048

    jmp    .new_sector

.incomplete_sector:

; we must read and memmove incomplete sector

    mov  [CDDataBuf_pointer],CDDataBuf

    call ReadCDWRetr      ; ������ ������ �����

    cmp   [DevErrorCode],0

    jne   .noaccess_3

    inc  dword [CDSectorAddress]

    mov    eax,CDDataBuf

    add    eax, ebx

    push    ecx

    add    ecx, ebx

    cmp    ecx, 2048

    jbe    @f

    mov    ecx, 2048

@@:

    sub    ecx, ebx

     push edi esi ecx

     mov edi,edx

     mov esi,eax ;0x7000   ; CD data buffer

     cld

     rep movsb

     pop ecx esi edi

    add    edx, ecx

    sub    [esp], ecx

    pop    ecx

    xor    ebx, ebx

    jmp    .new_sector

.done:

        mov     ebx, edx

        pop     eax edx ecx edi

        sub     ebx, edx

        ret

.eof:

        mov     ebx, edx

        pop     eax edx ecx

        sub     ebx, edx

        jmp     .reteof

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

;

;  fs_CdReadFolder - LFN variant for reading CD disk folder

;

;  esi  points to filename  /dir1/dir2/.../dirn/file,0

;  ebx  pointer to structure 32-bit number = first wanted block, 0+

;                          & flags (bitfields)

; flags: bit 0: 0=ANSI names, 1=UNICODE names

;  ecx  number of blocks to read, 0+

;  edx  mem location to return data

;

;  ret ebx = blocks read or 0xffffffff folder not found

;      eax = 0 ok read or other = errormsg

;

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

fs_CdReadFolder:

        push    edi

        call    cd_find_lfn

        jnc     .found

        pop     edi

        cmp   [DevErrorCode],0

        jne     .noaccess_1

        or      ebx, -1

        mov     eax, ERROR_FILE_NOT_FOUND

        ret

.found:

        mov    edi,[cd_current_pointer_of_input]

        test   byte [edi+25],10b    ; do not allow read directories

        jnz     .found_dir

        pop     edi

.noaccess_1:

        or      ebx, -1

        mov     eax, ERROR_ACCESS_DENIED

        ret

.found_dir:

        mov    eax,[edi+2]    ; eax=cluster

        mov    [CDSectorAddress],eax

        mov    eax,[edi+10] ; ������ �����������

.doit:

; init header

        push    eax ecx

        mov     edi, edx

        mov     ecx, 32/4

        xor     eax, eax

        rep     stosd

        pop     ecx eax

        mov     byte [edx], 1   ; version

        mov     [cd_mem_location],edx

        add     [cd_mem_location],32

; �������� ���������� ���� � ����

;.mainloop:

        mov  [cd_counter_block],dword 0

        dec  dword [CDSectorAddress]

        push ecx

.read_to_buffer:

        inc  dword [CDSectorAddress]

        mov  [CDDataBuf_pointer],CDDataBuf

        call ReadCDWRetr         ; ������ ������ ����������

        cmp   [DevErrorCode],0

        jne   .noaccess_1

        call .get_names_from_buffer

        sub  eax,2048

; ���������� �����������?

        cmp  eax,0

        jg   .read_to_buffer

        mov   edi,[cd_counter_block]

        mov   [edx+8],edi

        mov   edi,[ebx]

        sub   [edx+4],edi

        pop     ecx edi

        mov     ebx, [edx+4]

        mov     eax,ERROR_SUCCESS

        ret

.get_names_from_buffer:

    mov     [cd_current_pointer_of_input_2],CDDataBuf

    push    eax esi edi edx

.get_names_from_buffer_1:

    call    cd_get_name

    jc    .end_buffer

    inc    dword [cd_counter_block]

    mov    eax,[cd_counter_block]

    cmp    [ebx],eax

    jae     .get_names_from_buffer_1

    test    ecx, ecx

    jz    .get_names_from_buffer_1

    mov   edi,[cd_counter_block]

    mov   [edx+4],edi

    dec     ecx

    mov   esi,ebp

    mov   edi,[cd_mem_location]

    add   edi,40

    test   dword [ebx+4], 1 ; 0=ANSI, 1=UNICODE

    jnz    .unicode

;    jmp  .unicode

.ansi:

    cmp   [cd_counter_block],2

    jbe   .ansi_parent_directory

    cld

    lodsw

    xchg ah,al

    call uni2ansi_char

    cld

    stosb

; �������� ����� �����

    mov   al,[esi+1]

    cmp   al,byte 3Bh ; ��������� ����� ����� ';'

    je   .cd_get_parameters_of_file_1

; �������� ��� ������ �� ��������������� �����������

    movzx   eax,byte [ebp-33]

    add   eax,ebp

    sub   eax,34

    cmp   esi,eax

    je   .cd_get_parameters_of_file_1

; �������� ����� �����

    movzx   eax,byte [ebp-1]

    add   eax,ebp

    cmp   esi,eax

    jb   .ansi

.cd_get_parameters_of_file_1:

    mov   [edi],byte 0

    call  .cd_get_parameters_of_file

    add   [cd_mem_location],304

    jmp   .get_names_from_buffer_1

.ansi_parent_directory:

    cmp   [cd_counter_block],2

    je    @f

    mov   [edi],byte '.'

    inc   edi

    jmp  .cd_get_parameters_of_file_1

@@:

    mov   [edi],word '..'

    add   edi,2

    jmp  .cd_get_parameters_of_file_1

.unicode:

    cmp   [cd_counter_block],2

    jbe   .unicode_parent_directory

    cld

    movsw

; �������� ����� �����

    mov   ax,[esi]

    cmp   ax,word 3B00h ; ��������� ����� ����� ';'

    je   .cd_get_parameters_of_file_2

; �������� ��� ������ �� ��������������� �����������

    movzx   eax,byte [ebp-33]

    add   eax,ebp

    sub   eax,34

    cmp   esi,eax

    je   .cd_get_parameters_of_file_2

; �������� ����� �����

    movzx   eax,byte [ebp-1]

    add   eax,ebp

    cmp   esi,eax

    jb   .unicode

.cd_get_parameters_of_file_2:

    mov   [edi],word 0

    call  .cd_get_parameters_of_file

    add   [cd_mem_location],560

    jmp   .get_names_from_buffer_1

.unicode_parent_directory:

    cmp   [cd_counter_block],2

    je    @f

    mov   [edi],word 2E00h ; '.'

    add   edi,2

    jmp   .cd_get_parameters_of_file_2

@@:

    mov   [edi],dword 2E002E00h ; '..'

    add   edi,4

    jmp   .cd_get_parameters_of_file_2

.cd_get_parameters_of_file:

    mov   edi,[cd_mem_location]

; �������� �������� �����

    xor   eax,eax

; ���� �� �������������

    inc   al

    shl   eax,1

; ��� �������?

    test  [ebp-8],byte 2

    jz    .file

    inc   al

.file:

; ����� ���� �� ��� � FAT, � ���� ���� ����������

; ���� �� �������� ���������

    shl   eax,3

; ���� �������� �������? (������� �������������)

    test  [ebp-8],byte 1

    jz    .hidden

    inc   al

.hidden:

    shl   eax,1

; ���� ������ ������ ��� ������, ��� ��� ��� CD

    inc   al

    mov   [edi],eax

; �������� ����� ��� �����

;���

    movzx eax,byte [ebp-12]

    shl   eax,8

;������

    mov   al,[ebp-11]

    shl   eax,8

;�������

    mov   al,[ebp-10]

;����� �������� �����

    mov   [edi+8],eax

;����� ���������� �������

    mov   [edi+16],eax

;����� ��������� ������

    mov   [edi+24],eax

; �������� ���� ��� �����

;���

    movzx eax,byte [ebp-15]

    add   eax,1900

    shl   eax,8

;�����

    mov   al,[ebp-14]

    shl   eax,8

;����

    mov   al,[ebp-13]

;���� �������� �����

    mov   [edi+12],eax

;����� ���������� �������

    mov   [edi+20],eax

;����� ��������� ������

    mov   [edi+28],eax

; �������� ��� ������ �����

    xor   eax,eax

    test   dword [ebx+4], 1 ; 0=ANSI, 1=UNICODE

    jnz    .unicode_1

    mov    [edi+4],eax

    jmp   @f

.unicode_1:

    inc    eax

    mov    [edi+4],eax

@@:

; �������� ������ ����� � ������

    xor   eax,eax

    mov   [edi+32+4],eax

    mov   eax,[ebp-23]

    mov   [edi+32],eax

    ret

.end_buffer:

    pop   edx edi esi eax

    ret

cd_find_lfn:

; in: esi->name

; out: CF=1 - file not found

;      else CF=0 and [cd_current_pointer_of_input] direntry

        push eax esi

; 16 ������ ������ ������ ������������ �����

        mov  [CDSectorAddress],dword 15

.start:

        inc  dword [CDSectorAddress]

       mov  [CDDataBuf_pointer],CDDataBuf

       call  ReadCDWRetr

       cmp   [DevErrorCode],0

       jne   .access_denied

; �������� �� ��������

        cmp  [CDDataBuf+1],dword 'CD00'

        jne  .access_denied

        cmp  [CDDataBuf+5],byte '1'

        jne  .access_denied

; ������ �������� ������������ ����� ������������ �����?

        cmp  [CDDataBuf],byte 0xff

        je  .access_denied

; ������ �������� �������������� � ���������� ������������ ����?

        cmp  [CDDataBuf],byte 0x2

        jne  .start

; ������ �������� �������������� ������������ ����?

        cmp  [CDDataBuf+6],byte 0x1

        jne  .start

; ��������� root �����������

        mov  eax,[CDDataBuf+0x9c+2] ; ������ root �����������

        mov  [CDSectorAddress],eax

        mov  eax,[CDDataBuf+0x9c+10] ; ������ root �����������

        cmp    byte [esi], 0

        jnz    @f

        mov   [cd_current_pointer_of_input],CDDataBuf+0x9c

        jmp   .done

@@:

; �������� �����

.mainloop:

        dec  dword [CDSectorAddress]

.read_to_buffer:

        inc  dword [CDSectorAddress]

        mov  [CDDataBuf_pointer],CDDataBuf

        call ReadCDWRetr         ; ������ ������ ����������

        cmp   [DevErrorCode],0

        jne   .access_denied

        call cd_find_name_in_buffer

        jnc    .found

        sub  eax,2048

; ���������� �����������?

        cmp  eax,0

        jg   .read_to_buffer

; ��� �������� �������� �������

.access_denied:

        pop  esi eax

        stc

        ret

; ������� ������� ������� ������

  .found:

; ����� ���� �����

        cmp    byte [esi], 0

        jz    .done

        mov    eax,[cd_current_pointer_of_input]

        add    eax,2

        mov    eax,[eax]

        mov    [CDSectorAddress],eax ; ������ ����������

        add    eax,8

        mov    eax,[eax]  ; ������ ����������

        jmp    .mainloop

; ��������� ����� ������

   .done:

        pop  esi eax

        clc

        ret

cd_find_name_in_buffer:

        mov     [cd_current_pointer_of_input_2],CDDataBuf

.start:

        call    cd_get_name

        jc    .not_found

        call    cd_compare_name

        jc    .start

.found:

        clc

        ret

.not_found:

        stc

        ret

cd_get_name:

        push eax

        mov   ebp,[cd_current_pointer_of_input_2]

        mov   [cd_current_pointer_of_input],ebp

        mov   eax,[ebp]

        cmp   eax,0   ; ����� �����������?

        je    .next_sector

        cmp   ebp,CDDataBuf+2048     ; ����� ����������?

        jae   .next_sector

        movzx eax, byte [ebp]

        add   [cd_current_pointer_of_input_2],eax ; ��������� ���� ��������

        add   ebp,33 ; ��������� ���������� �� ������ �����

        pop   eax

        clc

        ret

.next_sector:

        pop  eax

        stc

        ret

cd_compare_name:

; compares ASCIIZ-names, case-insensitive (cp866 encoding)

; in: esi->name, ebp->name

; out: if names match: ZF=1 and esi->next component of name

;      else: ZF=0, esi is not changed

; destroys eax

    push    esi eax edi

    mov     edi,ebp

.loop:

    cld

    lodsb

    push ax

    call char_toupper

    call ansi2uni_char

    xchg ah,al

    cld

    scasw

    pop  ax

    je    .coincides

    call char_todown

    call ansi2uni_char

    xchg ah,al

    cld

    sub  edi,2

    scasw

    jne   .name_not_coincide

.coincides:

    cmp   [esi],byte '/'  ; ����������� ����, ����� ����� �������� ��������

    je   .done

    cmp   [esi],byte 0  ; ����������� ����, ����� ����� �������� ��������

    je   .done

    jmp   .loop

.name_not_coincide:

    pop    edi eax esi

    stc

    ret

.done:

; �������� ����� �����

    cmp   [edi],word 3B00h ; ��������� ����� ����� ';'

    je   .done_1

; �������� ��� ������ �� ��������������� �����������

    movzx   eax,byte [ebp-33]

    add   eax,ebp

    sub   eax,34

    cmp   edi,eax

    je   .done_1

; �������� ����� �����

    movzx   eax,byte [ebp-1]

    add   eax,ebp

    cmp   edi,eax

    jne   .name_not_coincide

.done_1:

    pop   edi eax

    add   esp,4

    inc   esi

    clc

    ret

char_todown:

; convert character to uppercase, using cp866 encoding

; in: al=symbol

; out: al=converted symbol

        cmp     al, 'A'

        jb      .ret

        cmp     al, 'Z'

        jbe     .az

        cmp     al, '�'

        jb      .ret

        cmp     al, '�'

        jb      .rus1

        cmp     al, '�'

        ja      .ret

; 0x90-0x9F -> 0xE0-0xEF

        add     al, '�'-'�'

.ret:

        ret

.rus1:

; 0x80-0x8F -> 0xA0-0xAF

.az:

        add     al, 0x20

        ret

uni2ansi_char:

; convert UNICODE character in al to ANSI character in ax, using cp866 encoding

; in: ax=UNICODE character

; out: al=converted ANSI character

        cmp     ax, 0x80

        jb      .ascii

        cmp     ax, 0x401

        jz      .yo1

        cmp     ax, 0x451

        jz      .yo2

        cmp     ax, 0x410

        jb      .unk

        cmp     ax, 0x440

        jb      .rus1

        cmp     ax, 0x450

        jb      .rus2

.unk:

        mov     al, '_'

        jmp     .doit

.yo1:

        mov     al, '�'

        jmp     .doit

.yo2:

        mov     al, '�'

        jmp     .doit

.rus1:

; 0x410-0x43F -> 0x80-0xAF

        add     al, 0x70

        jmp     .doit

.rus2:

; 0x440-0x44F -> 0xE0-0xEF

        add     al, 0xA0

.ascii:

.doit:

        ret