84 lines
1.2 KiB
PHP
84 lines
1.2 KiB
PHP
fat32_parse_dir:
|
|
; in: eax=directory cluster
|
|
; out: eax=entry cluster
|
|
xor bx, bx
|
|
mov di, bx
|
|
push eax
|
|
call read_cluster
|
|
movzx cx, byte [7C0Dh]
|
|
shl cx, 4
|
|
.scan_cluster:
|
|
pop eax
|
|
cmp byte [es:di], 0
|
|
jz file_not_found
|
|
mov si, [esp+2]
|
|
push eax
|
|
call fat_compare_name
|
|
jz .file_found
|
|
and di, not 1Fh
|
|
add di, 20h
|
|
loop .scan_cluster
|
|
pop eax
|
|
call next_cluster
|
|
jnc file_not_found
|
|
jc fat32_parse_dir
|
|
.file_found:
|
|
pop eax
|
|
mov si, [esp+2]
|
|
mov [cur_obj], si
|
|
and di, not 1Fh
|
|
mov si, directory_string
|
|
mov ax, [es:di+14h]
|
|
and ax, 0xFFF
|
|
shl eax, 10h
|
|
mov ax, [es:di+1Ah]
|
|
test eax, eax
|
|
mov si, nodata_string
|
|
jz find_error_si
|
|
ret 2
|
|
|
|
fat_compare_name:
|
|
push cx
|
|
mov cx, 9
|
|
.scan:
|
|
lodsb
|
|
cmp al, '.'
|
|
jz .ext
|
|
cmp al, 0
|
|
jz .nameend
|
|
cmp al, 'a'
|
|
jb .notletter
|
|
cmp al, 'z'
|
|
ja .notletter
|
|
or byte [es:di], 20h
|
|
.notletter:
|
|
scasb
|
|
loopz .scan
|
|
.notfound:
|
|
inc cx ; to clear ZF flag
|
|
pop cx
|
|
ret
|
|
.ext:
|
|
mov al, ' '
|
|
dec cx
|
|
repz scasb
|
|
jnz .notfound
|
|
test di, 1
|
|
jnz .notfound
|
|
mov cx, 4
|
|
jmp .scan
|
|
.nameend:
|
|
mov al, ' '
|
|
dec cx
|
|
repz scasb
|
|
jnz .notfound
|
|
test di, 1
|
|
jnz .file_found
|
|
mov cx, 3
|
|
repz scasb
|
|
jnz .notfound
|
|
.file_found:
|
|
xor cx, cx ; to set ZF flag
|
|
pop cx
|
|
ret
|