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Rev 63 Rev 65
Line 6... Line 6...
6 
;;                                                                 ;;
 6 
;;                                                                 ;;
7 
;;  Copyright 2002 Paolo Minazzi, paolo.minazzi@inwind.it          ;;
 7 
;;  Copyright 2002 Paolo Minazzi, paolo.minazzi@inwind.it          ;;
8 
;;                                                                 ;;
 8 
;;                                                                 ;;
9 
;;  See file COPYING for details                                   ;;
 9 
;;  See file COPYING for details                                   ;;
10 
;;                                                                 ;;
 10 
;;                                                                 ;;
- 
 
 11 
;;  28.01.2006 find all Fat16/32 partition in all input point      ;;
- 
 
 12 
;;             to MBR, see file part_set.inc - Mario79             ;;
11 
;;  15.01.2005 get file size/attr/date, file_append - ATV          ;;
 13 
;;  15.01.2005 get file size/attr/date, file_append - ATV          ;;
12 
;;  04.12.2004 skip volume label, file delete bug fixed - ATV      ;;
 14 
;;  04.12.2004 skip volume label, file delete bug fixed - ATV      ;;
13 
;;  29.11.2004 get_free_FAT changed, append dir bug fixed - ATV    ;;
 15 
;;  29.11.2004 get_free_FAT changed, append dir bug fixed - ATV    ;;
14 
;;  23.11.2004 don't allow overwrite dir with file - ATV           ;;
 16 
;;  23.11.2004 don't allow overwrite dir with file - ATV           ;;
15 
;;  18.11.2004 get_disk_info and more error codes - ATV            ;;
 17 
;;  18.11.2004 get_disk_info and more error codes - ATV            ;;
Line 49... Line 51...
49 
PUSHAD_EBX equ [esp+16]
 51 
PUSHAD_EBX equ [esp+16]
50 
PUSHAD_EBP equ [esp+8]
 52 
PUSHAD_EBP equ [esp+8]
51 
PUSHAD_ESI equ [esp+4]
 53 
PUSHAD_ESI equ [esp+4]
52 
PUSHAD_EDI equ [esp+0]
 54 
PUSHAD_EDI equ [esp+0]
Line 53... Line -...
53 
 
 - 
 
54 
align 4
 - 
 
55 
;******************************************************
 - 
 
56 
; Please do not change this place - variables  in text
- 
 
57 
; Mario79
 - 
 
58 
; START place
 - 
 
59 
;******************************************************
 - 
 
60 
PARTITION_START      dd 0x3f
 - 
 
61 
PARTITION_END        dd 0
 - 
 
62 
SECTORS_PER_FAT      dd 0x1f3a
 - 
 
63 
NUMBER_OF_FATS       dd 0x2
 - 
 
64 
SECTORS_PER_CLUSTER  dd 0x8
 - 
 
65 
BYTES_PER_SECTOR     dd 0x200   ; Note: if BPS <> 512 need lots of changes
 - 
 
66 
ROOT_CLUSTER         dd 2       ; first rootdir cluster
 - 
 
67 
FAT_START            dd 0       ; start of fat table
 - 
 
68 
ROOT_START           dd 0       ; start of rootdir (only fat16)
 - 
 
69 
ROOT_SECTORS         dd 0       ; count of rootdir sectors (only fat16)
 - 
 
70 
DATA_START           dd 0       ; start of data area (=first cluster 2)
 - 
 
71 
LAST_CLUSTER         dd 0       ; last availabe cluster
 - 
 
72 
ADR_FSINFO           dd 0       ; used only by fat32
 - 
 
73 
 
 - 
 
74 
fatRESERVED          dd 0x0FFFFFF6
 - 
 
75 
fatBAD               dd 0x0FFFFFF7
 - 
 
76 
fatEND               dd 0x0FFFFFF8
 - 
 
77 
fatMASK              dd 0x0FFFFFFF
 - 
 
78 
 
 - 
 
79 
fat_type             db 0       ; 0=none, 16=fat16, 32=fat32
 - 
 
80 
;***************************************************************************
 - 
 
81 
; End place
 - 
 
82 
; Mario79
 - 
 
83 
;***************************************************************************
 55 
 
84 
cluster              dd 0       ; used by file_write,makedir,append
 56 
cluster              dd 0       ; used by file_write,makedir,append
85 
partition_count      dd 0       ; partitions found by set_FAT32_variables
 57 
partition_count      dd 0       ; partitions found by set_FAT32_variables
86 
longname_sec1        dd 0       ; used by analyze_directory to save 2 previous
 58 
longname_sec1        dd 0       ; used by analyze_directory to save 2 previous
Line 129... Line 101...
129 
  f_del                db 0       ; 1=overwrite fat entry
 101 
  f_del                db 0       ; 1=overwrite fat entry
130 
  fat_change           db 0       ; 1=fat has changed
 102 
  fat_change           db 0       ; 1=fat has changed
Line 131... Line 103...
131 
 
 103 
 
Line 132... Line -...
132 
endg
 - 
 
133 
 
 - 
 
134 
iglobal
 - 
 
135 
  partition_types:              ; list of fat16/32 partitions
 - 
 
136 
    db    0x04                  ; DOS: fat16 <32M
 - 
 
137 
    db    0x06                  ; DOS: fat16 >32M
 - 
 
138 
    db    0x0b                  ; WIN95: fat32
 - 
 
139 
    db    0x0c                  ; WIN95: fat32, LBA-mapped
 - 
 
140 
    db    0x0e                  ; WIN95: fat16, LBA-mapped
 - 
 
141 
    db    0x14                  ; Hidden DOS: fat16 <32M
 - 
 
142 
    db    0x16                  ; Hidden DOS: fat16 >32M
 - 
 
143 
    db    0x1b                  ; Hidden WIN95: fat32
 - 
 
144 
    db    0x1c                  ; Hidden WIN95: fat32, LBA-mapped
 - 
 
145 
    db    0x1e                  ; Hidden WIN95: fat16, LBA-mapped
 - 
 
146 
    db    0xc4                  ; DRDOS/secured: fat16 <32M
 - 
 
147 
    db    0xc6                  ; DRDOS/secured: fat16 >32M
 - 
 
148 
    db    0xcb                  ; DRDOS/secured: fat32
 - 
 
149 
    db    0xcc                  ; DRDOS/secured: fat32, LBA-mapped
 - 
 
150 
    db    0xce                  ; DRDOS/secured: fat16, LBA-mapped
 - 
 
151 
    db    0xd4                  ; Old Multiuser DOS secured: fat16 <32M
 - 
 
152 
    db    0xd6                  ; Old Multiuser DOS secured: fat16 >32M
 - 
 
153 
  partition_types_end:
 - 
 
154 
 
 - 
 
155 
 
 - 
 
156 
  extended_types:               ; list of extended partitions
 - 
 
157 
    db    0x05                  ; DOS: extended partition
 - 
 
158 
    db    0x0f                  ; WIN95: extended partition, LBA-mapped
 - 
 
159 
    db    0xc5                  ; DRDOS/secured: extended partition
 - 
 
160 
    db    0xd5                  ; Old Multiuser DOS secured: extended partition
 - 
 
161 
  extended_types_end:
 - 
 
162 
 
 - 
 
163 
endg
 - 
 
164 
 
 104 
endg
Line 165... Line 105...
165 
 
 105 
 
166 
reserve_hd1:
 106 
reserve_hd1:
167 
 
 107 
 
Line 199... Line 139...
199 
    pop   edi ecx eax
 139 
    pop   edi ecx eax
200 
    ret
 140 
    ret
Line 201... Line 141...
201 
 
 141 
 
Line 202... Line -...
202 
problem_partition db 0  ; used for partitions search
- 
 
203 
 
 - 
 
204 
; Partition chain used:
 - 
 
205 
; MBR        ;   PARTITION2 ;   PARTITION3 ;   PARTITION4
 - 
 
206 
;==========================================================
 - 
 
207 
; fat16/32   +-- fat16/32   +-- fat16/32   +-- fat16/32   +--
 - 
 
208 
; extended --+   extended --+   extended --+   extended --+
 - 
 
209 
; 0              0              0              0
 - 
 
210 
; 0              0              0              0
 - 
 
211 
; Notes:
 - 
 
212 
; - extended partition need to be in second entry on table
 - 
 
213 
; - it will skip over removed partitions
 - 
 
214 
 
 - 
 
215 
set_FAT32_variables:
 - 
 
216 
    mov   [0xfe10],dword 0      ; entries in hd cache
 - 
 
217 
    mov   [problem_partition],0
 - 
 
218 
    call  reserve_hd1
 - 
 
219 
    call  clear_hd_cache
 - 
 
220 
 
 - 
 
221 
    cmp   dword [hdpos],0
 - 
 
222 
    je    problem_hd
 - 
 
223 
 
 - 
 
224 
    pushad
 - 
 
225 
    xor   ecx,ecx               ; partition count
 - 
 
226 
    mov   edx,-1                ; flag for partition
 - 
 
227 
    xor   eax,eax               ; read MBR
 - 
 
228 
    xor   ebp,ebp               ; extended partition start
 - 
 
229 
 
 - 
 
230 
new_partition:
 - 
 
231 
    test  ebp,ebp               ; is there extended partition?
 - 
 
232 
    jnz   extended_already_set  ; yes
 - 
 
233 
    xchg  ebp,eax               ; no. set it now
 - 
 
234 
 
 - 
 
235 
extended_already_set:
 - 
 
236 
    add   eax,ebp               ; mbr=mbr+0, ext_part=ext_start+relat_start
 - 
 
237 
    mov   ebx,buffer
 - 
 
238 
    call  hd_read
 - 
 
239 
 
 - 
 
240 
    cmp   word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
 - 
 
241 
    jnz   end_partition_chain
 - 
 
242 
    cmp   dword [ebx+0x1be+0xc],0 ; skip over empty partition
 - 
 
243 
    jz    next_partition
 - 
 
244 
 
 - 
 
245 
    push  eax ecx
 - 
 
246 
    mov   edi,partition_types
 - 
 
247 
    mov   ecx,partition_types_end-partition_types
 - 
 
248 
    mov   al,[ebx+0x1be+4]      ; get partition type
 - 
 
249 
    cld
 - 
 
250 
    repne scasb                 ; is partition type ok?
 - 
 
251 
    pop   ecx eax
 - 
 
252 
    jnz   next_partition        ; no. skip over
 - 
 
253 
 
 - 
 
254 
    inc   ecx
 - 
 
255 
    cmp   ecx,[fat32part]       ; is it wanted partition?
 - 
 
256 
    jnz   next_partition        ; no
 - 
 
257 
 
 - 
 
258 
    mov   edx,eax               ; start sector
 - 
 
259 
    add   edx,[ebx+0x1be+8]     ; add relative start
 - 
 
260 
 
 - 
 
261 
next_partition:
 - 
 
262 
    push  ecx
 - 
 
263 
    mov   edi,extended_types
 - 
 
264 
    mov   ecx,extended_types_end-extended_types
 - 
 
265 
    mov   al,[ebx+0x1be+4+16]   ; get second partition type
 - 
 
266 
    cld
 - 
 
267 
    repne scasb                 ; is it extended partition?
 - 
 
268 
    pop   ecx
 - 
 
269 
    jnz   end_partition_chain   ; no. end chain
 - 
 
270 
 
 - 
 
271 
    mov   eax,[ebx+0x1be+8+16]  ; get start of extended partition
 - 
 
272 
    test  eax,eax               ; is there extended partition?
 - 
 
273 
    jnz   new_partition         ; yes. read it
 - 
 
274 
 
 - 
 
275 
end_partition_chain:
 - 
 
276 
    mov   [partition_count],ecx
 - 
 
277 
 
 - 
 
278 
    cmp   edx,-1                ; found wanted partition?
 - 
 
279 
    jnz   hd_and_partition_ok   ; yes. install it
 - 
 
280 
    jmp   problem_partition_or_fat
 - 
 
281 
 
 - 
 
282 
problem_fat_dec_count:          ; bootsector is missing or another problem
 - 
 
283 
    dec   [partition_count]     ; remove it from partition_count
 - 
 
284 
 
 - 
 
285 
problem_partition_or_fat:
 - 
 
286 
    popad
 - 
 
287 
 
 - 
 
288 
problem_hd:
 - 
 
289 
    mov   [fat_type],0
 - 
 
290 
    mov   [hd1_status],0        ; free
 - 
 
291 
    mov   [problem_partition],1
 - 
 
292 
    ret
 - 
 
293 
 
 - 
 
294 
hd_and_partition_ok:
 - 
 
295 
    mov   eax,edx
 - 
 
296 
    mov   [PARTITION_START],eax
 - 
 
297 
 
 - 
 
298 
    mov   [hd_setup],1
 - 
 
299 
    mov   ebx,buffer
 142 
problem_partition db 0  ; used for partitions search
300 
    call  hd_read               ; read boot sector of partition
 - 
 
301 
    mov   [hd_setup],0
 - 
 
302 
 
 - 
 
303 
    cmp   word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
 - 
 
304 
    jnz   problem_fat_dec_count
 - 
 
305 
 
 - 
 
306 
    movzx eax,word [ebx+0xe]    ; sectors reserved
 - 
 
307 
    add   eax,[PARTITION_START]
 - 
 
308 
    mov   [FAT_START],eax       ; fat_start = partition_start + reserved
 - 
 
309 
 
 - 
 
310 
    movzx eax,byte [ebx+0xd]    ; sectors per cluster
 - 
 
311 
    mov   [SECTORS_PER_CLUSTER],eax
 - 
 
312 
 
 - 
 
313 
    movzx ecx,word [ebx+0xb]    ; bytes per sector
 - 
 
314 
    mov   [BYTES_PER_SECTOR],ecx
 - 
 
315 
 
 - 
 
316 
    movzx eax,word [ebx+0x11]   ; count of rootdir entries (=0 fat32)
 - 
 
317 
    mov   edx,32
 - 
 
318 
    mul   edx
 - 
 
319 
    dec   ecx
 - 
 
320 
    add   eax,ecx               ; round up if not equal count
 - 
 
321 
    inc   ecx                   ; bytes per sector
 - 
 
322 
    div   ecx
 - 
 
323 
    mov   [ROOT_SECTORS],eax    ; count of rootdir sectors
 - 
 
324 
 
 - 
 
325 
    movzx eax,word [ebx+0x16]   ; sectors per fat <65536
 - 
 
326 
    test  eax,eax
 - 
 
327 
    jnz   fat16_fatsize
 - 
 
328 
    mov   eax,[ebx+0x24]        ; sectors per fat
 - 
 
329 
  fat16_fatsize:
 - 
 
330 
    mov   [SECTORS_PER_FAT],eax
 - 
 
331 
 
 - 
 
332 
    movzx eax,byte [ebx+0x10]   ; number of fats
 - 
 
333 
    test  eax,eax               ; if 0 it's not fat partition
 - 
 
334 
    jz    problem_fat_dec_count
 - 
 
335 
    mov   [NUMBER_OF_FATS],eax
 - 
 
336 
    imul  eax,[SECTORS_PER_FAT]
 - 
 
337 
    add   eax,[FAT_START]
 - 
 
338 
    mov   [ROOT_START],eax      ; rootdir = fat_start + fat_size * fat_count
 - 
 
339 
    add   eax,[ROOT_SECTORS]    ; rootdir sectors should be 0 on fat32
 - 
 
340 
    mov   [DATA_START],eax      ; data area = rootdir + rootdir_size
 - 
 
341 
 
 - 
 
342 
    movzx eax,word [ebx+0x13]   ; total sector count <65536
 - 
 
343 
    test  eax,eax
 - 
 
344 
    jnz   fat16_total
 - 
 
345 
    mov   eax,[ebx+0x20]        ; total sector count
 - 
 
346 
  fat16_total:
 - 
 
347 
    add   eax,[PARTITION_START]
 - 
 
348 
    dec   eax
 - 
 
349 
    mov   [PARTITION_END],eax
 - 
 
350 
    inc   eax
 - 
 
351 
    sub   eax,[DATA_START]      ; eax = count of data sectors
 - 
 
352 
    xor   edx,edx
 - 
 
353 
    div   dword [SECTORS_PER_CLUSTER]
 - 
 
354 
    inc   eax
 - 
 
355 
    mov   [LAST_CLUSTER],eax
 - 
 
356 
    dec   eax                   ; cluster count
 - 
 
357 
 
 - 
 
358 
    ; limits by Microsoft Hardware White Paper v1.03
 - 
 
359 
    cmp   eax,4085              ; 0xff5
 - 
 
360 
    jb    problem_fat_dec_count ; fat12 not supported
 - 
 
361 
    cmp   eax,65525             ; 0xfff5
 - 
 
362 
    jb    fat16_partition
 - 
 
363 
 
 - 
 
364 
fat32_partition:
 - 
 
365 
    mov   eax,[ebx+0x2c]        ; rootdir cluster
 - 
 
366 
    mov   [ROOT_CLUSTER],eax
 - 
 
367 
    movzx eax,word [ebx+0x30]   ; fs info sector
 - 
 
368 
    add   eax,[PARTITION_START]
 - 
 
369 
    mov   [ADR_FSINFO],eax
 - 
 
370 
 
 - 
 
371 
    popad
 - 
 
372 
 
 - 
 
373 
    mov   [fatRESERVED],0x0FFFFFF6
 - 
 
374 
    mov   [fatBAD],0x0FFFFFF7
 - 
 
375 
    mov   [fatEND],0x0FFFFFF8
 - 
 
376 
    mov   [fatMASK],0x0FFFFFFF
 - 
 
377 
    mov   [fat_type],32         ; Fat32
 - 
 
378 
    mov   [hd1_status],0        ; free
 - 
 
379 
    ret
 - 
 
380 
 
 - 
 
381 
fat16_partition:
 - 
 
382 
    xor   eax,eax
 - 
 
383 
    mov   [ROOT_CLUSTER],eax
 - 
 
384 
 
 - 
 
385 
    popad
 - 
 
386 
 
 - 
 
387 
    mov   [fatRESERVED],0x0000FFF6
 - 
 
388 
    mov   [fatBAD],0x0000FFF7
 - 
 
389 
    mov   [fatEND],0x0000FFF8
 - 
 
390 
    mov   [fatMASK],0x0000FFFF
 - 
 
391 
    mov   [fat_type],16         ; Fat16
 - 
 
392 
    mov   [hd1_status],0        ; free
 - 
 
Line 393... Line 143...
393 
    ret
 143 
 
394 
 
 144 
include  'part_set.inc'
395 
 
 145 
 
396 
set_FAT:
 146 
set_FAT: