Subversion Repositories Kolibri OS

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

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

;       may be ebx=0 - start from first byte

;       may be ebx=0 - start from first byte

;  ecx  number of bytes to read, 0+

;  ecx  number of bytes to read, 0+

;  edx  mem location to return data

;  edx  mem location to return data

;

;

;      eax = 0 ok read or other = errormsg

;      eax = 0 ok read or other = errormsg

;

;

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

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

fs_HdRead:

fs_HdRead:

    cmp    [fat_type], 0

    cmp    [fat_type], 0

    jnz    .noaccess

    jnz    .noaccess

    test    ebx, ebx

    test    ebx, ebx

    jz    .l1

    jz    .l1

    cmp    dword [ebx+4], 0

    cmp    dword [ebx+4], 0

    jz    @f

    jz    @f

.reteof:

.reteof:

    mov    eax, 6

    mov    eax, 6

    pop    edi

    pop    edi

    ret

    ret

@@:

@@:

    mov    ebx, [ebx]

    mov    ebx, [ebx]

.l1:

.l1:

    mov    eax, [edi+20-2]

    mov    eax, [edi+20-2]

    mov    ax, [edi+26]

    mov    ax, [edi+26]

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

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

.new_cluster:

.new_cluster:

    jecxz    .new_sector

    jecxz    .new_sector

    test    eax, eax

    test    eax, eax

    jz    .eof

    jz    .eof

    jae    .skip

    jae    .skip

    add    ebx, 512

    add    ebx, 512

    jnz    .force_buf

    jnz    .force_buf

    cmp    ecx, 512

    cmp    ecx, 512

    jb    .force_buf

    jb    .force_buf

; we may read directly to given buffer

; we may read directly to given buffer

    push    ebx

    push    ebx

    mov    ebx, edx

    mov    ebx, edx

    call    hd_read

    call    hd_read

    cmp  [hd_error],0

    cmp  [hd_error],0

    jne  .noaccess_1    

    jne  .noaccess_1    

    pop    ebx

    pop    ebx

    add    edx, 512

    add    edx, 512

    sub    ecx, 512

    sub    ecx, 512

    jmp    .skip

    jmp    .skip

.force_buf:

.force_buf:

; we must read sector to temporary buffer and then copy it to destination

; we must read sector to temporary buffer and then copy it to destination

    push    eax ebx

    push    eax ebx

    mov    ebx, buffer

    mov    ebx, buffer

    cmp    ecx, 512

    cmp    ecx, 512

    jbe    @f

    jbe    @f

    mov    ecx, 512

    mov    ecx, 512

@@:

@@:

    sub    ecx, ebx

    sub    ecx, ebx

    mov    ebx, edx

    mov    ebx, edx

    call    memmove

    call    memmove

    add    edx, ecx

    add    edx, ecx

    sub    [esp], ecx

    sub    [esp], ecx

    pop    ecx

    pop    ecx

    pop    eax

    pop    eax

    xor    ebx, ebx

    xor    ebx, ebx

.skip:

.skip:

    inc    eax

    inc    eax

    dec    edi

    dec    edi

    jnz    .new_sector

    jnz    .new_sector

    mov    eax, [cluster_tmp]

    mov    eax, [cluster_tmp]

    cmp   [hd_error],0

    cmp   [hd_error],0

    jne   .noaccess_4

    jne   .noaccess_4

    jmp    .new_cluster

    jmp    .new_cluster

    xor    eax, eax

        sub     ebx, edx

    ret

        ret

    pop    ebx edx ecx ebx

        sub     ebx, edx

    jmp    .reteof

        jmp     .reteof

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

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

;  esi  points to filename

;  esi  points to filename

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

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

;  ecx  number of blocks to read, 0+

;  ecx  number of blocks to read, 0+

;  edx  mem location to return data

;  edx  mem location to return data

;

;

;      eax = 0 ok read or other = errormsg

;      eax = 0 ok read or other = errormsg

;

;

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

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

fs_HdReadFolder:

fs_HdReadFolder:

        mov     ebx, [ebx]

        mov     ebx, [ebx]

        or      ebx, -1

        or      ebx, -1

        ret

        ret

.done:

.done:

        add     esp, 262*2+4+8

        add     esp, 262*2+4+8

        pop     ebp

        pop     ebp

        xor     eax, eax

        xor     eax, eax

        dec     ecx

        dec     ecx

        js      @f

        js      @f

        mov     al, ERROR_END_OF_FILE

        mov     al, ERROR_END_OF_FILE

@@:

@@: