; ;
;----------------------------------------------------------;
+ ;---------------------------------------------;
+ ; FAT12 calltable and structure pointer ;
+ ;---------------------------------------------;
+ FAT12:
+ .data_pointer dd 0 ; internal driver data
+ .FSname db 'FAT12' ; 5 char filesystem name
+ .init dd init_fat12 ; pointer to init
+ .deinit dd 0 ; remove driver
+ .format dd 0 ; format drive
+ .mount dd 0 ; mount drive
+ .unmount dd 0 ; unmount drive
+ .find dd 0 ; find file
+ .findnext dd 0 ; get next match
+ .open dd 0 ; open file, get handle
+ .close dd 0 ; close file from handle
+ .attrib dd 0 ; get/set attrib. and time
+ .read dd 0 ; read file from handle
+ .write dd 0 ; write file from handle
+ .seek dd 0 ; seek from handle
+ .rename dd 0 ; rename file
+ .remove dd 0 ; remove file/dir
+ .create dd 0 ; create file/dir
+ .ioctl dd 0 ; extra calls if exists
+
;---------------------------------------------;
; FAT12 main info structure ;
;---------------------------------------------;
- struc fat12
+ struc fat12_data
{
.disk_number db 0 ; which VFS disk number
.root_dir dw 0 ; position of rootdir
+ .disk_size dd 0 ; total storage size
+ .free_space dd 0 ; free space available
.fat_1 dd 0 ; position of fat1
.fat_2 dd 0 ; position of fat2
.data_area dw 0 ; position of dataarea
- .disk_size dd 0 ; total storage size
- .free_space dd 0 ; free space available
.boot: times sizeof.bootsector db 0 ; copy of FAT12 bootsector
.dir_entries:
times 16 * sizeof.dir_entry db 0 ; 512b dir entry buffer
.fat_buffer: times 512 db 0 ; 512b FAT cluster info buffer
- .filehandles:
+ .foundfile:
+ times 1 * sizeof.search db 0 ; "DTA" like structure
+ .filehandles: ; "System File Table"
times 32 * sizeof.filehandle db 0 ; for now, max opened files is 32
}
virtual at 0 ; could use "at esi" instead
- fat12 fat12
- sizeof.fat12 = $-$$
+ fat12_data fat12_data
+ sizeof.fat12_data = $-$$
end virtual
;---------------------------------------------;
.jumper db 0,0,0
.oem db 0,0,0,0,0,0,0,0
.sectorsize dw 0
- .sect_per_clust db 0
+ .sect_per_clust db 0
.reserved_sect dw 0 ; reserved sectors, 1 for bootsector.
.fats_per_drive db 0
.root_entries dw 0
.disk_id dd 0 ; random ident number on format.
.volume_label db 0,0,0,0,0,0,0,0,0,0,0
.filesystem db 0,0,0,0,0,0,0,0 ; "FAT12 " or "FAT16 "
- .code: times 448 db 0
+ .code: times 448 db 0
.boot_signature db 0,0 ; 0x55,0xAA
}
sizeof.lfn_entry = $-$$
end virtual
+ ;---------------------------------------------;
+ ; FAT12 file search/DTA structure ;
+ ;---------------------------------------------;
+ struc search
+ {
+ .searchname:
+ times 255 db 0 ; file search pattern.
+ .attribute db 0 ; search attribute.
+ .direntry dw 0 ; directory entry number, 0 based
+ .dircluster dw 0 ; starting cluster of dir, 0 root
+ .foundattrib db 0 ; attribute of matching file
+ .foundtime dw 0 ; file time
+ .founddate dw 0 ; file date
+ .foundsize dw 0 ; file size
+ }
+
+ virtual at 0
+ search search
+ sizeof.search = $-$$
+ end virtual
+
;---------------------------------------------;
; FAT12 file-handle structure ;
;---------------------------------------------;
.filesize dd 0 ; filesize
.position dd 0 ; R/W position in file
.clusterpos dw 0 ; cluster number of last cluster read
+ .shortname:
+ times 11 db 0 ; short name
+ .fullname:
+ times 255 db 0 ; the full LFN
}
virtual at 0
attribute_lfn = 0x0F ; attrb. byte value for LFN dir entry
-
-
-
-fd0 fat12 ; define fd0 data.. tmp example.
-
-; TODO, alloc memory for struct and keep pointer only.
-; ---------------
-;drive dd 0
-;mov edi, drive+fat12into.boot
-
-;--------------------------------------
-; possible interface to copy/follow,
-; add getFilename/path function?
-;--------------------------------------
-; INT 21,3C Create file using handle
-; INT 21,3D Open file using handle
-; INT 21,3E Close file using handle
-; INT 21,3F Read file or device using handle
-; INT 21,40 Write file or device using handle
-; INT 21,41 Delete file
-; INT 21,42 Move file pointer using handle
-; INT 21,43 Change file mode
-; INT 21,45 Duplicate file handle
-; INT 21,46 Force duplicate file handle
-; INT 21,56 Rename file
-; INT 21,57 Get/set file date and time using handle
-; INT 21,5A Create temporary file (3.x+)
-; INT 21,5B Create new file (3.x+)
-; INT 21,67 Set handle count (DOS 3.3+)
-
;--------------------------------------------------------------;
; init_fat12 - detect if drive fs is fat12 and init ;
;--------------------------------------------------------------;
push eax
;...
- ;-----------------------------;
- ; calculate root location ;
- ;-----------------------------;
- xor eax, eax
- mov al, byte [fd0.boot.fats_per_drive]
- mul word [fd0.boot.sectors_per_fat]
- add ax, word [fd0.boot.reserved_sect]
- mov [fd0.root_dir], ax
+ ;-----------------------------;
+ ; calculate root location ;
+ ;-----------------------------;
+ xor eax, eax
+ mov al, byte [fd0.boot.fats_per_drive]
+ mul word [fd0.boot.sectors_per_fat]
+ add ax, word [fd0.boot.reserved_sect]
+ mov [fd0.root_dir], ax
-; working with
-;mov si, [drive]
-;mov ax, [si+fat12.boot.sectorssize]
+; working with
+;mov si, [drive]
+;mov ax, [si+fat12.boot.sectorssize]
- ; a bit more code here
+ ; a bit more code here
pop eax
ret
inc esi ; prepare for next character
loop .l1
- pop esi
+ pop esi
pop cx
ret
projects / BOS.git / blobdiff