; ;
;----------------------------------------------------------;
+ ;---------------------------------------------;
+ ; 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
;---------------------------------------------;
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 ;
;--------------------------------------------------------------;
;----------------------------------------------------------;
- ; file handles need to be dword, where the high
- ; word contains drive number, and the low word
- ; is the drive/FS specific handle. limits FS to
- ; a max of 65535 opened files. should be alright. ;)
-
-
;---------------------------------------------;
; VFS main structure ;
;---------------------------------------------;
struc VFS_filesystem
{
.data_pointer dd 0 ; internal driver data
+ .FSname db 0,0,0,0,0 ; 5 char filesystem name
.init dd 0 ; pointer to init
.deinit dd 0 ; remove driver
.format dd 0 ; format 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
push eax
;...
pop eax
+ ret
+
+;--------------------------------------------------------------;
+; open_file - open file, return handle ;
+;--------------------------------------------------------------;
+; ;
+; in: reg = ASCIIZ file name and such ;
+; ;
+; out: reg = dword file handle ;
+; ;
+;--------------------------------------------------------------;
+open_file:
+ push eax
+ ; file handles need to be dword, where the high
+ ; word contains drive number, and the low word
+ ; is the drive/FS specific handle. meaning no internal
+ ; table in VFS, created dynamically with FS info.
+ ; limits FS to a max of 65535 opened files. most use fewer
+ ; as default. FAT12 driver has 32.
+ ; FS reports error if handle is invalid.
+ pop eax
ret
\ No newline at end of file
projects / BOS.git / commitdiff