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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

IDE_Channel_1                  db  0

IDE_Channel_2                  db  0

endg

    cmp   [cd_status],0

    je    reserve_ok2

    call  change_task

    jmp   reserve_cd

    mov   eax,[0x3000]

    shl   eax,5

    mov   eax,[eax+0x3000+4]

    mov   [cd_status],eax

    pop   eax

    sti

    ret

    cmp   [ChannelNumber],1

    jne   .IDE_Channel_2

.IDE_Channel_1:

    cli

    cmp   [IDE_Channel_1],0

    je    .reserve_ok_1

    sti

    call  change_task

    jmp   .IDE_Channel_1

.IDE_Channel_2:

    cli

    cmp   [IDE_Channel_2],0

    je    .reserve_ok_2

    sti

    call  change_task

    jmp   .IDE_Channel_1

.reserve_ok_1:

    mov [IDE_Channel_1],1

    ret

.reserve_ok_2:

    mov [IDE_Channel_2],1

    ret

    cmp   [ChannelNumber],1

    jne   .IDE_Channel_2

.IDE_Channel_1:

    mov [IDE_Channel_1],0

    ret

.IDE_Channel_2:

    mov [IDE_Channel_2],0

    ret

;

;  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

    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

    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] ; ðåàëüíûé ðàçìåð ôàéëîâîé ñåêöèè

        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      ; ÷èòàåì ñåêòîð ôàéëà

    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      ; ÷èòàåì ñåêòîð ôàéëà

    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

        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] ; ðàçìåð äèðåêòðîðèè

.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

; íà÷èíàåì ïåðåáðîñêó ÁÄÂÊ â ÓÑÂÊ

;.mainloop:

        mov  [cd_counter_block],dword 0

        dec  dword [CDSectorAddress]

        push ecx

.read_to_buffer:

        inc  dword [CDSectorAddress]

        mov  [CDDataBuf_pointer],CDDataBuf

        call ReadCDWRetr         ; ÷èòàåì ñåêòîð äèðåêòîðèè

        cmp   [DevErrorCode],0

        jne   .noaccess_1

        call .get_names_from_buffer

        sub  eax,2048

; äèðåêòîðèÿ çàêîí÷èëàñü?

        cmp  eax,0

        ja   .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

    mov     [cd_current_pointer_of_input_2],CDDataBuf