Rev 52 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
1 | ha | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
||
3 | ;; FAT32.INC ;; |
||
4 | ;; ;; |
||
5 | ;; FAT16/32 functions for MenuetOS ;; |
||
6 | ;; ;; |
||
7 | ;; Copyright 2002 Paolo Minazzi, paolo.minazzi@inwind.it ;; |
||
8 | ;; ;; |
||
9 | ;; See file COPYING for details ;; |
||
10 | ;; ;; |
||
11 | ;; 15.01.2005 get file size/attr/date, file_append - ATV ;; |
||
12 | ;; 04.12.2004 skip volume label, file delete bug fixed - ATV ;; |
||
13 | ;; 29.11.2004 get_free_FAT changed, append dir bug fixed - ATV ;; |
||
14 | ;; 23.11.2004 don't allow overwrite dir with file - ATV ;; |
||
15 | ;; 18.11.2004 get_disk_info and more error codes - ATV ;; |
||
16 | ;; 17.11.2004 set_FAT/get_FAT and disk cache rewritten - ATV ;; |
||
17 | ;; 10.11.2004 removedir clear whole directory structure - ATV ;; |
||
18 | ;; 08.11.2004 rename - ATV ;; |
||
19 | ;; 30.10.2004 file_read return also dirsize in bytes - ATV ;; |
||
20 | ;; 20.10.2004 Makedir/Removedir - ATV ;; |
||
21 | ;; 14.10.2004 Partition chain/Fat16 - ATV (thanks drh3xx) ;; |
||
22 | ;; 06.9.2004 Fix free space by Mario79 added - MH ;; |
||
23 | ;; 24.5.2004 Write back buffer for File_write -VT ;; |
||
24 | ;; 20.5.2004 File_read function to work with syscall 58 - VT ;; |
||
25 | ;; 30.3.2004 Error parameters at function return - VT ;; |
||
26 | ;; 01.5.2002 Bugfix in device write - VT ;; |
||
27 | ;; 20.5.2002 Hd status check - VT ;; |
||
28 | ;; 29.6.2002 Improved fat32 verification - VT ;; |
||
29 | ;; ;; |
||
30 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
||
31 | |||
32 | cache_max equ 1919 ; max. is 1919*512+0x610000=0x6ffe00 |
||
33 | |||
52 | mikedld | 34 | ERROR_SUCCESS = 0 |
35 | ERROR_DISK_BASE = 1 |
||
36 | ERROR_UNSUPPORTED_FS = 2 |
||
37 | ERROR_UNKNOWN_FS = 3 |
||
38 | ERROR_PARTITION = 4 |
||
39 | ERROR_FILE_NOT_FOUND = 5 |
||
40 | ERROR_END_OF_FILE = 6 |
||
41 | ERROR_MEMORY_POINTER = 7 |
||
42 | ERROR_DISK_FULL = 8 |
||
43 | ERROR_FAT_TABLE = 9 |
||
44 | ERROR_ACCESS_DENIED = 10 |
||
1 | ha | 45 | |
46 | PUSHAD_EAX equ [esp+28] |
||
47 | PUSHAD_ECX equ [esp+24] |
||
48 | PUSHAD_EDX equ [esp+20] |
||
49 | PUSHAD_EBX equ [esp+16] |
||
50 | PUSHAD_EBP equ [esp+8] |
||
51 | PUSHAD_ESI equ [esp+4] |
||
52 | PUSHAD_EDI equ [esp+0] |
||
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 | ;*************************************************************************** |
||
84 | cluster dd 0 ; used by file_write,makedir,append |
||
85 | partition_count dd 0 ; partitions found by set_FAT32_variables |
||
86 | longname_sec1 dd 0 ; used by analyze_directory to save 2 previous |
||
87 | longname_sec2 dd 0 ; directory sectors for delete long filename |
||
88 | |||
89 | hd_error dd 0 ; set by wait_for_sector_buffer |
||
90 | hd_setup dd 0 |
||
91 | hd_wait_timeout dd 0 |
||
92 | |||
93 | cluster_tmp dd 0 ; used by analyze_directory |
||
94 | ; and analyze_directory_to_write |
||
95 | |||
96 | file_size dd 0 ; used by file_read |
||
97 | |||
98 | sector_tmp dd 0 ; used by rename,append,file_write |
||
99 | entry_pos dd 0 ; used by rename,append,file_write |
||
100 | |||
101 | old_filesize dd 0 ; used by append |
||
102 | new_filepos dd 0 ; used by append |
||
103 | bytes2write dd 0 ; used by append |
||
104 | |||
105 | cache_search_start dd 0 ; used by find_empty_slot |
||
106 | |||
107 | fat_in_cache dd -1 |
||
108 | fat_cache: times 512 db 0 |
||
109 | |||
110 | uglobal |
||
111 | Sector512: ; label for dev_hdcd.inc |
||
112 | buffer: times 512 db 0 |
||
113 | deltree_buffer: times 512 db 0 |
||
114 | endg |
||
115 | |||
116 | iglobal |
||
117 | NewDirEntry1 db ". ",0x10 |
||
118 | times 20 db 0 |
||
119 | NewDirEntry2 db ".. ",0x10 |
||
120 | times 20 db 0 |
||
121 | endg |
||
122 | |||
123 | uglobal |
||
124 | dir_entry: times 32 db 0 |
||
125 | |||
126 | startpath: times 255 db 0 |
||
127 | |||
128 | fat16_root db 0 ; flag for fat16 rootdir |
||
129 | f_del db 0 ; 1=overwrite fat entry |
||
130 | fat_change db 0 ; 1=fat has changed |
||
131 | |||
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 | |||
165 | |||
166 | reserve_hd1: |
||
167 | |||
168 | cli |
||
169 | cmp [hd1_status],0 |
||
170 | je reserve_ok1 |
||
171 | |||
172 | sti |
||
173 | call change_task |
||
174 | jmp reserve_hd1 |
||
175 | |||
176 | reserve_ok1: |
||
177 | |||
178 | push eax |
||
179 | mov eax,[0x3000] |
||
180 | shl eax,5 |
||
181 | mov eax,[eax+0x3000+4] |
||
182 | mov [hd1_status],eax |
||
183 | pop eax |
||
184 | sti |
||
185 | ret |
||
186 | |||
187 | |||
188 | clear_hd_cache: |
||
189 | |||
190 | push eax ecx edi |
||
191 | mov edi,0x600000 |
||
192 | mov ecx,16384 |
||
193 | xor eax,eax |
||
194 | cld |
||
195 | rep stosd ; clear hd cache with 0 |
||
196 | mov [cache_search_start],eax |
||
197 | mov [fat_in_cache],-1 |
||
198 | mov [fat_change],0 |
||
199 | pop edi ecx eax |
||
200 | ret |
||
201 | |||
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 |
||
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 |
||
393 | ret |
||
394 | |||
395 | |||
396 | set_FAT: |
||
397 | ;-------------------------------- |
||
398 | ; input : EAX = cluster |
||
399 | ; EDX = value to save |
||
400 | ; output : EDX = old value |
||
401 | ;-------------------------------- |
||
402 | push eax ebx esi |
||
403 | |||
404 | cmp eax,2 |
||
405 | jb sfc_error |
||
406 | cmp eax,[LAST_CLUSTER] |
||
407 | ja sfc_error |
||
408 | cmp [fat_type],16 |
||
409 | je sfc_1 |
||
410 | add eax,eax |
||
411 | sfc_1: |
||
412 | add eax,eax |
||
413 | mov esi,511 |
||
414 | and esi,eax ; esi = position in fat sector |
||
415 | shr eax,9 ; eax = fat sector |
||
416 | add eax,[FAT_START] |
||
417 | mov ebx,fat_cache |
||
418 | |||
419 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
||
420 | je sfc_in_cache ; yes |
||
421 | |||
422 | cmp [fat_change],0 ; is fat changed? |
||
423 | je sfc_no_change ; no |
||
424 | call write_fat_sector ; yes. write it into disk |
||
425 | |||
426 | sfc_no_change: |
||
427 | mov [fat_in_cache],eax ; save fat sector |
||
428 | call hd_read |
||
429 | |||
430 | sfc_in_cache: |
||
431 | cmp [fat_type],16 |
||
432 | jne sfc_test32 |
||
433 | |||
434 | cmp [f_del],1 ; overwrite previous value? |
||
435 | je sfc_set16 ; yes |
||
436 | cmp word [ebx+esi],0 ; is cluster free? |
||
437 | je sfc_set16 ; yes |
||
438 | mov dword [8*0x100000],0xffffff |
||
439 | mov edx,[ebx+esi] ; get old value |
||
440 | jmp sfc_nonzero |
||
441 | |||
442 | sfc_set16: |
||
443 | xchg [ebx+esi],dx ; save new value and get old value |
||
444 | jmp sfc_write |
||
445 | |||
446 | sfc_test32: |
||
447 | mov eax,[fatMASK] |
||
448 | cmp [f_del],1 ; overwrite previous value? |
||
449 | je sfc_set32 ; yes |
||
450 | test eax,[ebx+esi] ; is cluster free? |
||
451 | je sfc_set32 ; yes |
||
452 | mov dword [8*0x100000],0xffffff |
||
453 | mov edx,[ebx+esi] ; get old value |
||
454 | jmp sfc_nonzero |
||
455 | |||
456 | sfc_set32: |
||
457 | and edx,eax |
||
458 | xor eax,-1 ; mask for high bits |
||
459 | and eax,[ebx+esi] ; get high 4 bits |
||
460 | or eax,edx |
||
461 | mov edx,[ebx+esi] ; get old value |
||
462 | mov [ebx+esi],eax ; save new value |
||
463 | |||
464 | sfc_write: |
||
465 | mov [fat_change],1 ; fat has changed |
||
466 | |||
467 | sfc_nonzero: |
||
468 | and edx,[fatMASK] |
||
469 | |||
470 | sfc_error: |
||
471 | pop esi ebx eax |
||
472 | ret |
||
473 | |||
474 | |||
475 | get_FAT: |
||
476 | ;-------------------------------- |
||
477 | ; input : EAX = cluster |
||
478 | ; output : EAX = next cluster |
||
479 | ;-------------------------------- |
||
480 | push ebx esi |
||
481 | |||
482 | cmp [fat_type],16 |
||
483 | je gfc_1 |
||
484 | add eax,eax |
||
485 | gfc_1: |
||
486 | add eax,eax |
||
487 | mov esi,511 |
||
488 | and esi,eax ; esi = position in fat sector |
||
489 | shr eax,9 ; eax = fat sector |
||
490 | add eax,[FAT_START] |
||
491 | mov ebx,fat_cache |
||
492 | |||
493 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
||
494 | je gfc_in_cache |
||
495 | |||
496 | cmp [fat_change],0 ; is fat changed? |
||
497 | je gfc_no_change ; no |
||
498 | call write_fat_sector ; yes. write it into disk |
||
499 | |||
500 | gfc_no_change: |
||
501 | mov [fat_in_cache],eax |
||
502 | call hd_read |
||
503 | |||
504 | gfc_in_cache: |
||
505 | mov eax,[ebx+esi] |
||
506 | and eax,[fatMASK] |
||
507 | pop esi ebx |
||
508 | ret |
||
509 | |||
510 | |||
511 | get_free_FAT: |
||
512 | ;----------------------------------------------------------- |
||
513 | ; input : EAX = # cluster for start the searching |
||
514 | ; output : if CARRY=0 EAX = # first cluster found free |
||
515 | ; if CARRY=1 disk full |
||
516 | ; Note : for more speed need to use fat_cache directly |
||
517 | ;----------------------------------------------------------- |
||
518 | push ecx |
||
519 | mov ecx,[LAST_CLUSTER] ; counter for full disk |
||
520 | sub ecx,2 |
||
521 | |||
522 | gff_test: |
||
523 | cmp eax,[LAST_CLUSTER] ; if above last cluster start at cluster 2 |
||
524 | jbe gff_in_range |
||
525 | mov eax,2 |
||
526 | |||
527 | gff_in_range: |
||
528 | push eax |
||
529 | call get_FAT ; get cluster state |
||
530 | test eax,eax ; is it free? |
||
531 | pop eax |
||
532 | je gff_found ; yes |
||
533 | inc eax ; next cluster |
||
534 | dec ecx ; is all checked? |
||
535 | jns gff_test ; no |
||
536 | |||
537 | gff_not_found: |
||
538 | pop ecx ; yes. disk is full |
||
539 | stc |
||
540 | ret |
||
541 | |||
542 | gff_found: |
||
543 | pop ecx |
||
544 | clc |
||
545 | ret |
||
546 | |||
547 | |||
548 | write_fat_sector: |
||
549 | ;----------------------------------------------------------- |
||
550 | ; write changed fat to disk |
||
551 | ;----------------------------------------------------------- |
||
552 | push eax ebx ecx |
||
553 | |||
554 | mov [fat_change],0 |
||
555 | mov eax,[fat_in_cache] |
||
556 | cmp eax,-1 |
||
557 | jz write_fat_not_used |
||
558 | mov ebx,fat_cache |
||
559 | mov ecx,[NUMBER_OF_FATS] |
||
560 | |||
561 | write_next_fat: |
||
562 | call hd_write |
||
563 | add eax,[SECTORS_PER_FAT] |
||
564 | dec ecx |
||
565 | jnz write_next_fat |
||
566 | |||
567 | write_fat_not_used: |
||
568 | pop ecx ebx eax |
||
569 | ret |
||
570 | |||
571 | |||
572 | analyze_directory: |
||
573 | ;----------------------------------------------------------- |
||
574 | ; input : EAX = first cluster of the directory |
||
575 | ; EBX = pointer to filename |
||
576 | ; output : IF CARRY=0 EAX = sector where th file is found |
||
577 | ; EBX = pointer in buffer |
||
578 | ; [buffer .. buffer+511] |
||
579 | ; ECX,EDX,ESI,EDI not changed |
||
580 | ; IF CARRY=1 filename not found |
||
581 | ; Note : if cluster=0 it's changed to read rootdir |
||
582 | ; save 2 previous directory sectors in longname_sec |
||
583 | ;----------------------------------------------------------- |
||
584 | push ecx edx esi edi ebx ; ebx = [esp+0] |
||
585 | mov [longname_sec1],0 |
||
586 | mov [longname_sec2],0 |
||
587 | |||
588 | adr_new_cluster: |
||
589 | mov [cluster_tmp],eax |
||
590 | mov [fat16_root],0 |
||
591 | cmp eax,[LAST_CLUSTER] |
||
592 | ja adr_not_found ; too big cluster number, something is wrong |
||
593 | cmp eax,2 |
||
594 | jnb adr_data_cluster |
||
595 | |||
596 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
597 | cmp [fat_type],16 |
||
598 | jne adr_data_cluster |
||
599 | mov eax,[ROOT_START] |
||
600 | mov edx,[ROOT_SECTORS] |
||
601 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
602 | jmp adr_new_sector |
||
603 | |||
604 | adr_data_cluster: |
||
605 | sub eax,2 |
||
606 | mov edx,[SECTORS_PER_CLUSTER] |
||
607 | imul eax,edx |
||
608 | add eax,[DATA_START] |
||
609 | |||
610 | adr_new_sector: |
||
611 | mov ebx,buffer |
||
612 | call hd_read |
||
613 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
||
614 | |||
615 | adr_analyze: |
||
616 | mov edi,[ebx+11] ; file attribute |
||
617 | and edi,0xf |
||
618 | cmp edi,0xf |
||
619 | je adr_long_filename |
||
620 | test edi,0x8 ; skip over volume label |
||
621 | jne adr_long_filename ; Note: label can be same name as file/dir |
||
622 | |||
623 | mov esi,[esp+0] ; filename need to be uppercase |
||
624 | mov edi,ebx |
||
625 | push ecx |
||
626 | mov ecx,11 |
||
627 | cld |
||
628 | rep cmpsb ; compare 8+3 filename |
||
629 | pop ecx |
||
630 | je adr_found |
||
631 | |||
632 | adr_long_filename: |
||
633 | add ebx,32 ; position of next dir entry |
||
634 | dec ecx |
||
635 | jnz adr_analyze |
||
636 | |||
637 | mov ecx,[longname_sec1] ; save 2 previous directory sectors |
||
638 | mov [longname_sec1],eax ; for delete long filename |
||
639 | mov [longname_sec2],ecx |
||
640 | inc eax ; next sector |
||
641 | dec edx |
||
642 | jne adr_new_sector |
||
643 | cmp [fat16_root],1 ; end of fat16 rootdir |
||
644 | je adr_not_found |
||
645 | |||
646 | adr_next_cluster: |
||
647 | mov eax,[cluster_tmp] |
||
648 | call get_FAT ; get next cluster |
||
649 | cmp eax,2 ; incorrect fat chain? |
||
650 | jb adr_not_found ; yes |
||
651 | cmp eax,[fatRESERVED] ; is it end of directory? |
||
652 | jb adr_new_cluster ; no. analyse it |
||
653 | |||
654 | adr_not_found: |
||
655 | pop edi edi esi edx ecx ; first edi will remove ebx |
||
656 | stc ; file not found |
||
657 | ret |
||
658 | |||
659 | adr_found: |
||
660 | pop edi edi esi edx ecx ; first edi will remove ebx |
||
661 | clc ; file found |
||
662 | ret |
||
663 | |||
664 | |||
665 | analyze_directory_to_write: |
||
666 | ;----------------------------------------------------------- |
||
667 | ; input : EAX = first cluster of the directory |
||
668 | ; output : IF CARRY=0 EAX = sector where the empty pos is found |
||
669 | ; EBX = pointer in buffer |
||
670 | ; [buffer .. buffer+511] |
||
671 | ; ECX,EDX,ESI,EDI not changed |
||
672 | ; IF CARRY=1 disk full or fat corrupted |
||
673 | ; Note : if cluster=0 it's changed to read rootdir |
||
674 | ;----------------------------------------------------------- |
||
675 | push ecx edx edi |
||
676 | |||
677 | adw_new_cluster: |
||
678 | mov [cluster_tmp],eax |
||
679 | mov [fat16_root],0 |
||
680 | cmp eax,[LAST_CLUSTER] |
||
681 | ja adw_not_found ; too big cluster number, something is wrong |
||
682 | cmp eax,2 |
||
683 | jnb adw_data_cluster |
||
684 | |||
685 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
686 | cmp [fat_type],16 |
||
687 | jne adw_data_cluster |
||
688 | mov eax,[ROOT_START] |
||
689 | mov edx,[ROOT_SECTORS] |
||
690 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
691 | jmp adw_new_sector |
||
692 | |||
693 | adw_data_cluster: |
||
694 | sub eax,2 |
||
695 | mov edx,[SECTORS_PER_CLUSTER] |
||
696 | imul eax,edx |
||
697 | add eax,[DATA_START] |
||
698 | |||
699 | adw_new_sector: |
||
700 | mov ebx,buffer |
||
701 | call hd_read |
||
702 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
||
703 | |||
704 | adw_analyze: |
||
705 | cmp byte [ebx],0x00 ; is free entry? |
||
706 | je adw_found ; yes |
||
707 | cmp byte [ebx],0xe5 ; is deleted entry? |
||
708 | je adw_found ; yes |
||
709 | add ebx,32 ; position of next dir entry |
||
710 | dec ecx |
||
711 | jnz adw_analyze |
||
712 | |||
713 | inc eax ; next sector |
||
714 | dec edx |
||
715 | jne adw_new_sector |
||
716 | cmp [fat16_root],1 ; end of fat16 rootdir |
||
717 | je adw_not_found |
||
718 | |||
719 | mov eax,[cluster_tmp] |
||
720 | call get_FAT ; get next cluster |
||
721 | cmp eax,2 ; incorrect fat chain? |
||
722 | jb adw_not_found ; yes |
||
723 | cmp eax,[fatRESERVED] ; is it end of directory? |
||
724 | jb adw_new_cluster ; no. analyse it |
||
725 | |||
726 | mov eax,2 ; this block of code add a new cluster |
||
727 | call get_free_FAT ; for the directory because the directory |
||
728 | jc adw_not_found ; is full |
||
729 | |||
730 | mov edx,[fatEND] ; new end for directory |
||
731 | call set_FAT |
||
732 | |||
733 | push eax ; save new cluster |
||
734 | mov edx,eax |
||
735 | mov eax,[cluster_tmp] ; change last cluster to point new cluster |
||
736 | mov [f_del],1 |
||
737 | call set_FAT |
||
738 | mov [f_del],0 |
||
739 | |||
740 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
741 | call add_disk_free_space |
||
742 | |||
743 | mov ecx,512/4 |
||
744 | xor eax,eax |
||
745 | mov edi,buffer |
||
746 | cld |
||
747 | rep stosd ; clear new directory cluster |
||
748 | pop eax |
||
749 | |||
750 | sub eax,2 |
||
751 | mov ecx,[SECTORS_PER_CLUSTER] |
||
752 | imul eax,ecx |
||
753 | add eax,[DATA_START] |
||
754 | mov ebx,buffer |
||
755 | push eax ; save sector number |
||
756 | |||
757 | adw_set_empty_directory: |
||
758 | call hd_write |
||
759 | inc eax ; next sector |
||
760 | dec ecx |
||
761 | jnz adw_set_empty_directory |
||
762 | |||
763 | pop eax |
||
764 | |||
765 | adw_found: |
||
766 | pop edi edx ecx |
||
767 | clc ; free space found |
||
768 | ret |
||
769 | |||
770 | adw_not_found: |
||
771 | pop edi edx ecx |
||
772 | stc ; free space not found |
||
773 | ret |
||
774 | |||
775 | |||
776 | get_data_cluster: |
||
777 | ;----------------------------------------------------------- |
||
778 | ; input : EAX = cluster |
||
779 | ; EBX = pointer to buffer |
||
780 | ; EDX = # blocks to read in buffer |
||
781 | ; ESI = # blocks to skip over |
||
782 | ; output : if CARRY=0 ok EBX/EDX/ESI updated |
||
783 | ; if CARRY=1 cluster out of range |
||
784 | ; Note : if cluster=0 it's changed to read rootdir |
||
785 | ;----------------------------------------------------------- |
||
786 | push eax ecx |
||
787 | |||
788 | mov [fat16_root],0 |
||
789 | cmp eax,[LAST_CLUSTER] |
||
790 | ja gdc_error ; too big cluster number, something is wrong |
||
791 | cmp eax,2 |
||
792 | jnb gdc_cluster |
||
793 | |||
794 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
795 | cmp [fat_type],16 |
||
796 | jne gdc_cluster |
||
797 | mov eax,[ROOT_START] |
||
798 | mov ecx,[ROOT_SECTORS] ; Note: not cluster size |
||
799 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
800 | jmp gdc_read |
||
801 | |||
802 | gdc_cluster: |
||
803 | sub eax,2 |
||
804 | mov ecx,[SECTORS_PER_CLUSTER] |
||
805 | imul eax,ecx |
||
806 | add eax,[DATA_START] |
||
807 | |||
808 | gdc_read: |
||
809 | test esi,esi ; first wanted block |
||
810 | je gdcl1 ; yes, skip count is 0 |
||
811 | dec esi |
||
812 | jmp gdcl2 |
||
813 | |||
814 | gdcl1: |
||
815 | call hd_read |
||
816 | add ebx,512 ; update pointer |
||
817 | dec edx |
||
818 | |||
819 | gdcl2: |
||
820 | test edx,edx ; is all read? |
||
821 | je out_of_read |
||
822 | |||
823 | inc eax ; next sector |
||
824 | dec ecx |
||
825 | jnz gdc_read |
||
826 | |||
827 | out_of_read: |
||
828 | pop ecx eax |
||
829 | clc |
||
830 | ret |
||
831 | |||
832 | gdc_error: |
||
833 | pop ecx eax |
||
834 | stc |
||
835 | ret |
||
836 | |||
837 | |||
838 | set_data_cluster: |
||
839 | ;----------------------------------------------------------- |
||
840 | ; input : EAX = cluster |
||
841 | ; EBX = pointer to buffer |
||
842 | ; output : if CARRY=0 ok |
||
843 | ; if CARRY=1 cluster out of range |
||
844 | ;----------------------------------------------------------- |
||
845 | push eax ebx edx |
||
846 | |||
847 | cmp eax,[LAST_CLUSTER] |
||
848 | ja sdc_error ; too big cluster number, something is wrong |
||
849 | sub eax,2 |
||
850 | jb sdc_error ; don't allow rootdir write |
||
851 | |||
852 | mov edx,[SECTORS_PER_CLUSTER] |
||
853 | imul eax,edx |
||
854 | add eax,[DATA_START] |
||
855 | |||
856 | sdc_write: |
||
857 | call hd_write |
||
858 | add ebx,512 ; update pointer |
||
859 | inc eax |
||
860 | dec edx |
||
861 | jnz sdc_write |
||
862 | pop edx ebx eax |
||
863 | clc |
||
864 | ret |
||
865 | |||
866 | sdc_error: |
||
867 | pop edx ebx eax |
||
868 | stc |
||
869 | ret |
||
870 | |||
871 | |||
872 | get_cluster_of_a_path: |
||
873 | ;--------------------------------------------------------- |
||
874 | ; input : EBX = pointer to a path string |
||
875 | ; (example: the path "/files/data/document" become |
||
876 | ; "files......data.......document...0" |
||
877 | ; '.' = space char |
||
878 | ; '0' = char(0) (ASCII=0) !!! ) |
||
879 | ; output : if (CARRY=1) -> ERROR in the PATH |
||
880 | ; if (CARRY=0) -> EAX=cluster |
||
881 | ;--------------------------------------------------------- |
||
882 | push ebx edx |
||
883 | |||
884 | mov eax,[ROOT_CLUSTER] |
||
885 | mov edx,ebx |
||
886 | |||
887 | search_end_of_path: |
||
888 | cmp byte [edx],0 |
||
889 | je found_end_of_path |
||
890 | |||
891 | inc edx ; '/' |
||
892 | mov ebx,edx |
||
893 | call analyze_directory |
||
894 | jc directory_not_found |
||
895 | |||
896 | mov eax,[ebx+20-2] ; read the HIGH 16bit cluster field |
||
897 | mov ax,[ebx+26] ; read the LOW 16bit cluster field |
||
898 | and eax,[fatMASK] |
||
899 | add edx,11 ; 8+3 (name+extension) |
||
900 | jmp search_end_of_path |
||
901 | |||
902 | found_end_of_path: |
||
903 | pop edx ebx |
||
904 | clc ; no errors |
||
905 | ret |
||
906 | |||
907 | directory_not_found: |
||
908 | pop edx ebx |
||
909 | stc ; errors occour |
||
910 | ret |
||
911 | |||
912 | |||
913 | bcd2bin: |
||
914 | ;---------------------------------- |
||
915 | ; input : AL=BCD number (eg. 0x11) |
||
916 | ; output : AH=0 |
||
917 | ; AL=decimal number (eg. 11) |
||
918 | ;---------------------------------- |
||
919 | xor ah,ah |
||
920 | shl ax,4 |
||
921 | shr al,4 |
||
922 | aad |
||
923 | ret |
||
924 | |||
925 | |||
926 | get_date_for_file: |
||
927 | ;----------------------------------------------------- |
||
928 | ; Get date from CMOS and pack day,month,year in AX |
||
929 | ; DATE bits 0..4 : day of month 0..31 |
||
930 | ; 5..8 : month of year 1..12 |
||
931 | ; 9..15 : count of years from 1980 |
||
932 | ;----------------------------------------------------- |
||
933 | mov al,0x7 ;day |
||
934 | out 0x70,al |
||
935 | in al,0x71 |
||
936 | call bcd2bin |
||
937 | ror eax,5 |
||
938 | |||
939 | mov al,0x8 ;month |
||
940 | out 0x70,al |
||
941 | in al,0x71 |
||
942 | call bcd2bin |
||
943 | ror eax,4 |
||
944 | |||
945 | mov al,0x9 ;year |
||
946 | out 0x70,al |
||
947 | in al,0x71 |
||
948 | call bcd2bin |
||
949 | add ax,20 ;because CMOS return only the two last |
||
950 | ;digit (eg. 2000 -> 00 , 2001 -> 01) and we |
||
951 | rol eax,9 ;need the difference with 1980 (eg. 2001-1980) |
||
952 | ret |
||
953 | |||
954 | |||
955 | get_time_for_file: |
||
956 | ;----------------------------------------------------- |
||
957 | ; Get time from CMOS and pack hour,minute,second in AX |
||
958 | ; TIME bits 0..4 : second (the low bit is lost) |
||
959 | ; 5..10 : minute 0..59 |
||
960 | ; 11..15 : hour 0..23 |
||
961 | ;----------------------------------------------------- |
||
962 | mov al,0x0 ;second |
||
963 | out 0x70,al |
||
964 | in al,0x71 |
||
965 | call bcd2bin |
||
966 | ror eax,6 |
||
967 | |||
968 | mov al,0x2 ;minute |
||
969 | out 0x70,al |
||
970 | in al,0x71 |
||
971 | call bcd2bin |
||
972 | ror eax,6 |
||
973 | |||
974 | mov al,0x4 ;hour |
||
975 | out 0x70,al |
||
976 | in al,0x71 |
||
977 | call bcd2bin |
||
978 | rol eax,11 |
||
979 | ret |
||
980 | |||
981 | |||
982 | set_current_time_for_entry: |
||
983 | ;----------------------------------------------------- |
||
984 | ; Set current time/date for file entry |
||
985 | ; input : ebx = file entry pointer |
||
986 | ;----------------------------------------------------- |
||
987 | push eax |
||
988 | call get_time_for_file ; update files date/time |
||
989 | mov [ebx+22],ax |
||
990 | call get_date_for_file |
||
991 | mov [ebx+24],ax |
||
992 | pop eax |
||
993 | ret |
||
994 | |||
995 | |||
996 | makedir: |
||
997 | ;----------------------------------------------------- |
||
998 | ; input : eax = directory name |
||
999 | ; edx = path |
||
1000 | ; output : eax = 0 - ok |
||
1001 | ; 3 - unknown FS |
||
1002 | ; 5 - file not found |
||
1003 | ; 8 - disk full |
||
1004 | ; 10 - access denied |
||
1005 | ; Note : can only make one directory at time |
||
1006 | ;----------------------------------------------------- |
||
1007 | cmp [fat_type],0 |
||
1008 | jnz make_dir_fat_ok |
||
1009 | mov eax,ERROR_UNKNOWN_FS |
||
1010 | ret |
||
1011 | |||
1012 | make_dir_fat_ok: |
||
1013 | ; call reserve_hd1 |
||
1014 | |||
1015 | pushad |
||
1016 | |||
1017 | mov ebx,edx |
||
1018 | call get_cluster_of_a_path |
||
1019 | jnc make_dir_found_path |
||
1020 | |||
1021 | make_dir_path_not_found: |
||
1022 | popad |
||
1023 | call update_disk ; write all of cache and fat to hd |
||
1024 | mov [hd1_status],0 |
||
1025 | mov eax,ERROR_FILE_NOT_FOUND |
||
1026 | ret |
||
1027 | |||
1028 | make_dir_disk_full: |
||
1029 | popad |
||
1030 | call update_disk ; write all of cache and fat to hd |
||
1031 | mov [hd1_status],0 |
||
1032 | mov eax,ERROR_DISK_FULL |
||
1033 | ret |
||
1034 | |||
1035 | make_dir_already_exist: |
||
1036 | mov eax,[cluster] ; directory cluster |
||
1037 | xor edx,edx ; free |
||
1038 | mov [f_del],1 |
||
1039 | call set_FAT |
||
1040 | mov [f_del],0 |
||
1041 | |||
1042 | popad |
||
1043 | call update_disk ; write all of cache and fat to hd |
||
1044 | mov [hd1_status],0 |
||
1045 | mov eax,ERROR_ACCESS_DENIED |
||
1046 | ret |
||
1047 | |||
1048 | make_dir_found_path: |
||
1049 | cmp eax,[ROOT_CLUSTER] |
||
1050 | jnz make_dir_not_root |
||
1051 | xor eax,eax |
||
1052 | |||
1053 | make_dir_not_root: |
||
1054 | mov ecx,eax ; directorys start cluster |
||
1055 | mov word [NewDirEntry2+26],cx ; 16 bits low of cluster |
||
1056 | shr ecx,16 |
||
1057 | mov word [NewDirEntry2+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1058 | |||
1059 | push eax ; save parent directory cluster |
||
1060 | mov eax,2 |
||
1061 | call get_free_FAT |
||
1062 | mov [cluster],eax ; first free cluster |
||
1063 | pop eax |
||
1064 | jc make_dir_disk_full |
||
1065 | |||
1066 | push eax |
||
1067 | mov eax,[cluster] ; directory cluster |
||
1068 | mov edx,[fatEND] ; end for directory |
||
1069 | call set_FAT |
||
1070 | pop eax |
||
1071 | |||
1072 | mov ebx,PUSHAD_EAX ; dir name |
||
1073 | push eax |
||
1074 | call analyze_directory ; check if directory already exist |
||
1075 | pop eax |
||
1076 | jnc make_dir_already_exist ; need to free allocated cluster! |
||
1077 | |||
1078 | call analyze_directory_to_write |
||
1079 | jc make_dir_already_exist ; need to free allocated cluster! |
||
1080 | |||
1081 | mov esi,PUSHAD_EAX ; dir name |
||
1082 | mov edi,ebx ; pointer in buffer |
||
1083 | mov ecx,11 |
||
1084 | cld |
||
1085 | rep movsb |
||
1086 | |||
1087 | mov dword [ebx+28],0 ; dir size is always 0 |
||
1088 | mov ecx,[cluster] |
||
1089 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1090 | mov word [NewDirEntry1+26],cx |
||
1091 | shr ecx,16 |
||
1092 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1093 | mov word [NewDirEntry1+20],cx |
||
1094 | mov byte [ebx+11],0x10 ; attribute = directory |
||
1095 | |||
1096 | call set_current_time_for_entry |
||
1097 | mov ecx,[ebx+22] |
||
1098 | mov dword [NewDirEntry1+22],ecx |
||
1099 | mov dword [NewDirEntry2+22],ecx |
||
1100 | |||
1101 | mov ebx,buffer ; save the directory name,length,cluster |
||
1102 | call hd_write |
||
1103 | |||
1104 | mov ecx,512/4 |
||
1105 | xor eax,eax |
||
1106 | mov edi,buffer |
||
1107 | cld |
||
1108 | rep stosd ; clear new directory cluster |
||
1109 | |||
1110 | mov eax,[cluster] ; new directory cluster |
||
1111 | sub eax,2 |
||
1112 | mov edx,[SECTORS_PER_CLUSTER] |
||
1113 | imul eax,edx |
||
1114 | add eax,[DATA_START] |
||
1115 | mov ebx,buffer |
||
1116 | add eax,edx ; start from last sector |
||
1117 | |||
1118 | dir_set_empty_directory: |
||
1119 | dec eax ; next sector |
||
1120 | cmp edx,1 ; is first directory sector? |
||
1121 | jnz not_first_sector ; no. write empty sector |
||
1122 | mov esi,NewDirEntry1 |
||
1123 | mov edi,buffer |
||
1124 | mov ecx,64/4 |
||
1125 | cld |
||
1126 | rep movsd ; copy 2 first directory entrys "." and ".." |
||
1127 | |||
1128 | not_first_sector: |
||
1129 | call hd_write |
||
1130 | dec edx |
||
1131 | jnz dir_set_empty_directory |
||
1132 | |||
1133 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
1134 | call add_disk_free_space |
||
1135 | |||
1136 | popad |
||
1137 | call update_disk ; write all of cache and fat to hd |
||
1138 | mov [hd1_status],0 |
||
1139 | xor eax,eax |
||
1140 | ret |
||
1141 | |||
1142 | |||
1143 | removedir: |
||
1144 | ;----------------------------------------------------- |
||
1145 | ; input : eax = file/directory name |
||
1146 | ; edx = path |
||
1147 | ; output : eax = 0 - ok |
||
1148 | ; 3 - unknown FS |
||
1149 | ; 5 - file not found |
||
1150 | ; 10 - access denied |
||
1151 | ;----------------------------------------------------- |
||
1152 | cmp [fat_type],0 |
||
1153 | jnz remove_dir_fat_ok |
||
1154 | mov eax,ERROR_UNKNOWN_FS |
||
1155 | ret |
||
1156 | |||
1157 | remove_dir_fat_ok: |
||
1158 | ; call reserve_hd1 |
||
1159 | |||
1160 | push edi |
||
1161 | mov edi,1 ; allow directory remove |
||
1162 | call file_delete |
||
1163 | pop edi |
||
1164 | |||
1165 | call update_disk ; write all of cache and fat to hd |
||
1166 | mov [hd1_status],0 |
||
1167 | ret |
||
1168 | |||
1169 | |||
1170 | add_disk_free_space: |
||
1171 | ;----------------------------------------------------- |
||
1172 | ; input : ecx = cluster count |
||
1173 | ; Note : negative = remove clusters from free space |
||
1174 | ; positive = add clusters to free space |
||
1175 | ;----------------------------------------------------- |
||
1176 | test ecx,ecx ; no change |
||
1177 | je add_dfs_no |
||
1178 | cmp [fat_type],32 ; free disk space only used by fat32 |
||
1179 | jne add_dfs_no |
||
1180 | |||
1181 | push eax ebx |
||
1182 | mov eax,[ADR_FSINFO] |
||
1183 | mov ebx,buffer |
||
1184 | call hd_read |
||
1185 | cmp dword [ebx+0x1fc],0xaa550000 ; check sector id |
||
1186 | jne add_not_fs |
||
1187 | |||
1188 | add [ebx+0x1e8],ecx |
||
1189 | call hd_write |
||
1190 | |||
1191 | add_not_fs: |
||
1192 | pop ebx eax |
||
1193 | |||
1194 | add_dfs_no: |
||
1195 | ret |
||
1196 | |||
1197 | |||
1198 | file_append: |
||
1199 | ;----------------------------------------------------- |
||
1200 | ; input : eax = file name |
||
1201 | ; edx = path |
||
1202 | ; ecx = pointer to buffer |
||
1203 | ; ebx = bytes to write (0 = truncate file) |
||
1204 | ; esi = start position (-1 = end of file) |
||
1205 | ; output : eax = 0 - ok |
||
1206 | ; 3 - unknown FS |
||
1207 | ; 5 - file not found |
||
1208 | ; 6 - end of file |
||
1209 | ; 8 - disk full |
||
1210 | ; 9 - fat table corrupted |
||
1211 | ; 10 - access denied |
||
1212 | ; ebx = bytes written |
||
1213 | ;----------------------------------------------------- |
||
1214 | cmp [fat_type],0 |
||
1215 | jnz append_fat_ok |
||
1216 | mov eax,ERROR_UNKNOWN_FS |
||
1217 | ret |
||
1218 | |||
1219 | append_fat_ok: |
||
1220 | ; call reserve_hd1 |
||
1221 | |||
1222 | pushad |
||
1223 | |||
1224 | mov ebx,edx |
||
1225 | call get_cluster_of_a_path |
||
1226 | jc append_not_found |
||
1227 | |||
1228 | mov ebx,PUSHAD_EAX ; file name |
||
1229 | call analyze_directory |
||
1230 | jc append_not_found |
||
1231 | |||
1232 | mov [sector_tmp],eax |
||
1233 | mov [entry_pos],ebx |
||
1234 | |||
1235 | test byte [ebx+11],0x10 ; is it directory? |
||
1236 | jnz append_access ; yes |
||
1237 | |||
1238 | mov ecx,[ebx+28] ; file size |
||
1239 | mov edi,PUSHAD_ESI ; write position |
||
1240 | cmp edi,-1 ; -1 = eof |
||
1241 | jnz append_inside_file |
||
1242 | mov edi,ecx ; file size |
||
1243 | |||
1244 | append_inside_file: |
||
1245 | cmp edi,ecx ; start above old file size? |
||
1246 | ja append_eof ; yes |
||
1247 | |||
1248 | mov [old_filesize],ecx |
||
1249 | mov [new_filepos],edi |
||
1250 | |||
1251 | mov ecx,PUSHAD_EBX ; bytes to write |
||
1252 | test ecx,ecx ; truncate? |
||
1253 | jz append_truncate ; yes |
||
1254 | |||
1255 | mov [bytes2write],ecx ; bytes to write |
||
1256 | mov esi,PUSHAD_ECX ; pointer to buffer |
||
1257 | mov eax,[ebx+20-2] ; FAT entry |
||
1258 | mov ax,[ebx+26] |
||
1259 | and eax,[fatMASK] |
||
1260 | jnz append_find_pos ; first cluster <> 0 |
||
1261 | |||
1262 | mov eax,2 |
||
1263 | call get_free_FAT |
||
1264 | jc append_disk_full |
||
1265 | mov ecx,eax ; set files first cluster |
||
1266 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1267 | shr ecx,16 |
||
1268 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1269 | mov edx,[fatEND] ; new end for cluster chain |
||
1270 | call set_FAT |
||
1271 | |||
1272 | push eax ; save first cluster |
||
1273 | mov eax,[sector_tmp] |
||
1274 | mov ebx,buffer |
||
1275 | call hd_write ; write new file entry back to disk |
||
1276 | pop eax |
||
1277 | |||
1278 | append_remove_free: |
||
1279 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
1280 | call add_disk_free_space ; Note: uses buffer |
||
1281 | |||
1282 | append_found_cluster: |
||
1283 | mov [cluster],eax |
||
1284 | sub eax,2 |
||
1285 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1286 | imul eax,ecx |
||
1287 | add eax,[DATA_START] |
||
1288 | xor edi,edi |
||
1289 | |||
1290 | append_new_sector: |
||
1291 | push ecx |
||
1292 | mov ecx,[bytes2write] ; bytes left in buffer |
||
1293 | mov ebx,512 |
||
1294 | sub ebx,edi ; bytes left in sector |
||
1295 | cmp ecx,ebx |
||
1296 | jb append_bytes_ok |
||
1297 | mov ecx,ebx |
||
1298 | |||
1299 | append_bytes_ok: |
||
1300 | cmp ecx,512 ; overwrite full sector? |
||
1301 | jz append_full_sector ; yes |
||
1302 | mov ebx,buffer ; overwrite part of sector |
||
1303 | call hd_read ; read old sector |
||
1304 | |||
1305 | append_full_sector: |
||
1306 | sub [bytes2write],ecx |
||
1307 | add [new_filepos],ecx |
||
1308 | add edi,buffer |
||
1309 | cld |
||
1310 | rep movsb |
||
1311 | pop ecx |
||
1312 | |||
1313 | mov ebx,buffer |
||
1314 | call hd_write |
||
1315 | cmp [bytes2write],0 ; is all done? |
||
1316 | jz append_done |
||
1317 | xor edi,edi |
||
1318 | inc eax |
||
1319 | dec ecx |
||
1320 | jnz append_new_sector |
||
1321 | |||
1322 | mov eax,[cluster] |
||
1323 | call get_FAT |
||
1324 | cmp eax,2 |
||
1325 | jb append_fat |
||
1326 | cmp eax,[LAST_CLUSTER] |
||
1327 | jbe append_found_cluster |
||
1328 | |||
1329 | append_alloc_cluster: |
||
1330 | mov eax,2 ; ToDo: use temp array to keep track |
||
1331 | call get_free_FAT ; of last free cluster |
||
1332 | jc append_disk_full |
||
1333 | push eax ; save new cluster |
||
1334 | mov edx,[fatEND] ; new end for cluster chain |
||
1335 | call set_FAT |
||
1336 | mov edx,eax |
||
1337 | mov eax,[cluster] |
||
1338 | mov [f_del],1 |
||
1339 | call set_FAT ; update previous cluster |
||
1340 | mov [f_del],0 |
||
1341 | pop eax |
||
1342 | jmp append_remove_free |
||
1343 | |||
1344 | append_find_pos: |
||
1345 | call find_filepos |
||
1346 | mov [cluster],ebx |
||
1347 | jnc append_new_sector |
||
1348 | test edi,edi |
||
1349 | jz append_alloc_cluster |
||
1350 | |||
1351 | append_fat: |
||
1352 | mov eax,ERROR_FAT_TABLE |
||
1353 | jmp append_ret_code |
||
1354 | |||
1355 | append_disk_full: |
||
1356 | mov eax,ERROR_DISK_FULL |
||
1357 | jmp append_ret_code |
||
1358 | |||
1359 | append_done: |
||
1360 | xor eax,eax |
||
1361 | |||
1362 | append_ret_code: |
||
1363 | mov PUSHAD_EAX,eax ; return code |
||
1364 | |||
1365 | mov eax,[sector_tmp] ; update directory entry |
||
1366 | mov ebx,buffer |
||
1367 | call hd_read |
||
1368 | mov ebx,[entry_pos] |
||
1369 | mov ecx,[new_filepos] |
||
1370 | cmp ecx,[old_filesize] ; is file pos above old size? |
||
1371 | jbe append_size_ok ; no |
||
1372 | mov [ebx+28],ecx ; new file size |
||
1373 | |||
1374 | append_size_ok: |
||
1375 | call set_current_time_for_entry |
||
1376 | mov ebx,buffer |
||
1377 | call hd_write ; write new file entry back to disk |
||
1378 | |||
1379 | sub ecx,PUSHAD_ESI ; start position |
||
1380 | mov PUSHAD_EBX,ecx ; bytes written |
||
1381 | popad |
||
1382 | call update_disk ; write all of cache and fat to hd |
||
1383 | mov [hd1_status],0 |
||
1384 | ret |
||
1385 | |||
1386 | append_eof: |
||
1387 | popad |
||
1388 | mov [hd1_status],0 |
||
1389 | xor ebx,ebx |
||
1390 | mov eax,ERROR_END_OF_FILE |
||
1391 | ret |
||
1392 | |||
1393 | append_not_found: |
||
1394 | popad |
||
1395 | mov [hd1_status],0 |
||
1396 | xor ebx,ebx |
||
1397 | mov eax,ERROR_FILE_NOT_FOUND |
||
1398 | ret |
||
1399 | |||
1400 | append_access: |
||
1401 | popad |
||
1402 | mov [hd1_status],0 |
||
1403 | xor ebx,ebx |
||
1404 | mov eax,ERROR_ACCESS_DENIED |
||
1405 | ret |
||
1406 | |||
1407 | append_truncate: |
||
1408 | mov edx,[ebx+20-2] ; FAT entry |
||
1409 | mov dx,[ebx+26] |
||
1410 | and edx,[fatMASK] |
||
1411 | mov [ebx+28],edi ; set new file size |
||
1412 | test edi,edi ; 0 length file? |
||
1413 | jnz truncate_save_size ; no |
||
1414 | mov [ebx+20],di ; FAT entry = 0 |
||
1415 | mov [ebx+26],di |
||
1416 | |||
1417 | truncate_save_size: |
||
1418 | call set_current_time_for_entry |
||
1419 | mov ebx,buffer |
||
1420 | call hd_write |
||
1421 | mov eax,edx ; first cluster |
||
1422 | test edi,edi ; 0 length file? |
||
1423 | jz truncate_clear_chain |
||
1424 | |||
1425 | imul esi,[SECTORS_PER_CLUSTER],512 ; esi = cluster size in bytes |
||
1426 | |||
1427 | truncate_new_cluster: |
||
1428 | cmp eax,2 ; incorrect fat chain? |
||
1429 | jb truncate_eof ; yes |
||
1430 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1431 | jnb truncate_eof ; yes |
||
1432 | sub edi,esi |
||
1433 | jbe truncate_pos_found |
||
1434 | call get_FAT ; get next cluster |
||
1435 | jmp truncate_new_cluster |
||
1436 | |||
1437 | truncate_pos_found: |
||
1438 | mov edx,[fatEND] ; new end for cluster chain |
||
1439 | mov [f_del],1 |
||
1440 | call set_FAT |
||
1441 | mov [f_del],0 |
||
1442 | mov eax,edx ; clear rest of chain |
||
1443 | |||
1444 | truncate_clear_chain: |
||
1445 | call clear_cluster_chain |
||
1446 | |||
1447 | truncate_eof: |
||
1448 | popad |
||
1449 | call update_disk ; write all of cache and fat to hd |
||
1450 | mov [hd1_status],0 |
||
1451 | xor ebx,ebx |
||
1452 | xor eax,eax |
||
1453 | ret |
||
1454 | |||
1455 | |||
1456 | find_filepos: |
||
1457 | ;----------------------------------------------------- |
||
1458 | ; input : eax = first cluster |
||
1459 | ; edi = bytes to skip over (start position) |
||
1460 | ; output : if CARRY=0 file position found |
||
1461 | ; if CARRY=1 end of file found |
||
1462 | ; eax = current file sector |
||
1463 | ; ebx = last cluster |
||
1464 | ; ecx = sector count in last cluster |
||
1465 | ; edi = bytes to skip over (sector position) |
||
1466 | ;----------------------------------------------------- |
||
1467 | push esi |
||
1468 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1469 | imul esi,ecx,512 ; esi = cluster size in bytes |
||
1470 | mov ebx,eax |
||
1471 | |||
1472 | filepos_new_cluster: |
||
1473 | cmp eax,2 ; incorrect fat chain? |
||
1474 | jb filepos_eof ; yes |
||
1475 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1476 | jnb filepos_eof ; yes |
||
1477 | |||
1478 | mov ebx,eax |
||
1479 | cmp edi,esi ; skip over full cluster? |
||
1480 | jb filepos_cluster_ok ; no |
||
1481 | |||
1482 | sub edi,esi |
||
1483 | call get_FAT ; get next cluster |
||
1484 | jmp filepos_new_cluster |
||
1485 | |||
1486 | filepos_cluster_ok: |
||
1487 | sub eax,2 |
||
1488 | imul eax,ecx |
||
1489 | add eax,[DATA_START] |
||
1490 | |||
1491 | filepos_new_sector: |
||
1492 | cmp edi,512 ; skip over full sector? |
||
1493 | jb filepos_sector_ok ; no |
||
1494 | sub edi,512 |
||
1495 | inc eax |
||
1496 | dec ecx |
||
1497 | jnz filepos_new_sector |
||
1498 | |||
1499 | filepos_eof: |
||
1500 | pop esi |
||
1501 | stc |
||
1502 | ret |
||
1503 | |||
1504 | filepos_sector_ok: |
||
1505 | pop esi |
||
1506 | clc |
||
1507 | ret |
||
1508 | |||
1509 | |||
1510 | file_write: |
||
1511 | ;-------------------------------------------------------------------------- |
||
1512 | ; INPUT : user-reg register-in-this meaning symbol-in-this-routine |
||
1513 | ; |
||
1514 | ; EAX EDI system call to write / |
||
1515 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1516 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1517 | ; ECX EBX (PAR2) file size PAR2 |
||
1518 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1519 | ; |
||
1520 | ; output : eax = 0 - ok |
||
1521 | ; 3 - unknown FS |
||
1522 | ; 5 - file not found |
||
1523 | ; 8 - disk full |
||
1524 | ; 10 - access denied |
||
1525 | ;-------------------------------------------------------------------------- |
||
1526 | cmp [fat_type],0 |
||
1527 | jnz fat_ok_for_writing |
||
1528 | mov eax,ERROR_UNKNOWN_FS |
||
1529 | ret |
||
1530 | |||
1531 | fat_ok_for_writing: |
||
1532 | ; call reserve_hd1 |
||
1533 | |||
1534 | pushad |
||
1535 | |||
1536 | xor edi,edi ; don't allow directory remove |
||
1537 | call file_delete ; try to delete the file first |
||
1538 | test eax,eax |
||
1539 | jz old_deleted ; deleted ok |
||
1540 | cmp eax,ERROR_FILE_NOT_FOUND |
||
1541 | jnz exit_write_access ; it exist but can't delete |
||
1542 | |||
1543 | old_deleted: |
||
1544 | mov ebx,PUSHAD_EDX |
||
1545 | call get_cluster_of_a_path |
||
1546 | jnc found_directory_for_writing |
||
1547 | |||
1548 | exit_writing_with_error: |
||
1549 | popad |
||
1550 | call update_disk ; write all of cache and fat to hd |
||
1551 | mov [hd1_status],0 |
||
1552 | mov eax,ERROR_FILE_NOT_FOUND |
||
1553 | ret |
||
1554 | |||
1555 | exit_writing_disk_full_clear: |
||
1556 | mov eax,[sector_tmp] |
||
1557 | mov ebx,buffer |
||
1558 | call hd_read ; read directory sector |
||
1559 | mov edx,[entry_pos] |
||
1560 | mov byte [edx],0xe5 ; mark as deleted |
||
1561 | call hd_write |
||
1562 | mov eax,[edx+20-2] ; FAT entry |
||
1563 | mov ax,[edx+26] |
||
1564 | and eax,[fatMASK] |
||
1565 | call clear_cluster_chain |
||
1566 | |||
1567 | exit_writing_disk_full: |
||
1568 | popad |
||
1569 | call update_disk ; write all of cache and fat to hd |
||
1570 | mov [hd1_status],0 |
||
1571 | mov eax,ERROR_DISK_FULL |
||
1572 | ret |
||
1573 | |||
1574 | exit_write_access: |
||
1575 | popad |
||
1576 | call update_disk ; write all of cache and fat to hd |
||
1577 | mov [hd1_status],0 |
||
1578 | mov eax,ERROR_ACCESS_DENIED |
||
1579 | ret |
||
1580 | |||
1581 | found_directory_for_writing: |
||
1582 | call analyze_directory_to_write |
||
1583 | jc exit_writing_disk_full |
||
1584 | |||
1585 | mov [sector_tmp],eax |
||
1586 | mov [entry_pos],ebx |
||
1587 | push eax ; save directory sector |
||
1588 | mov eax,2 |
||
1589 | call get_free_FAT |
||
1590 | mov [cluster],eax ; first free cluster |
||
1591 | pop eax |
||
1592 | jc exit_writing_disk_full |
||
1593 | |||
1594 | mov esi,PUSHAD_EAX ; file name |
||
1595 | mov edi,ebx ; pointer in buffer |
||
1596 | mov ecx,11 |
||
1597 | cld |
||
1598 | rep movsb |
||
1599 | |||
1600 | mov esi,PUSHAD_EBX ; file size (bytes left) |
||
1601 | mov [ebx+28],esi ; file size |
||
1602 | mov ecx,[cluster] |
||
1603 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1604 | shr ecx,16 |
||
1605 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1606 | mov byte [ebx+11],0x20 ; attribute = archive |
||
1607 | |||
1608 | call set_current_time_for_entry |
||
1609 | |||
1610 | mov ebx,buffer ; save the directory name,length,cluster |
||
1611 | call hd_write |
||
1612 | |||
1613 | imul edi,[SECTORS_PER_CLUSTER],512 ; edi = cluster size in bytes |
||
1614 | xor ecx,ecx ; cluster count |
||
1615 | mov ebx,PUSHAD_ECX ; ebx = buffer |
||
1616 | |||
1617 | hd_new_block_write: |
||
1618 | |||
1619 | mov eax,[cluster] ; eax = block |
||
1620 | call set_data_cluster |
||
1621 | |||
1622 | sub esi,edi ; sub wrote bytes |
||
1623 | jbe file_saved_OK ; end if all done |
||
1624 | add ebx,edi ; update buffer position |
||
1625 | |||
1626 | inc eax |
||
1627 | call get_free_FAT ; next free in FAT |
||
1628 | jc exit_writing_disk_full_clear |
||
1629 | |||
1630 | mov edx,eax |
||
1631 | xchg eax,[cluster] ; get old cluster and save new cluster |
||
1632 | call set_FAT ; add it in cluster chain |
||
1633 | dec ecx ; update cluster count |
||
1634 | jmp hd_new_block_write |
||
1635 | |||
1636 | file_saved_OK: |
||
1637 | |||
1638 | mov edx,[fatEND] ; new end for cluster chain |
||
1639 | call set_FAT |
||
1640 | dec ecx ; update cluster count |
||
1641 | |||
1642 | call add_disk_free_space ; remove clusters from free disk space |
||
1643 | |||
1644 | popad |
||
1645 | call update_disk ; write all of cache and fat to hd |
||
1646 | mov [hd1_status],0 |
||
1647 | xor eax,eax |
||
1648 | ret |
||
1649 | |||
1650 | |||
1651 | file_read: |
||
1652 | ;-------------------------------------------------------------------------- |
||
1653 | ; INPUT : user-register register-in-this meaning symbol-in-this |
||
1654 | ; |
||
1655 | ; EAX EDI system call to write / |
||
1656 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1657 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1658 | ; ECX EBX (PAR2) vt file blocks to read PAR2 |
||
1659 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1660 | ; EDI ESI vt first 512 block to read |
||
1661 | ; EDI if 0 - read root |
||
1662 | ; |
||
1663 | ; output : eax = 0 - ok |
||
1664 | ; 3 - unknown FS |
||
1665 | ; 5 - file not found |
||
1666 | ; 6 - end of file |
||
1667 | ; 9 - fat table corrupted |
||
1668 | ; ebx = size of file/directory |
||
1669 | ;-------------------------------------------------------------------------- |
||
1670 | cmp [fat_type],0 |
||
1671 | jnz fat_ok_for_reading |
||
1672 | xor ebx,ebx |
||
1673 | mov eax,ERROR_UNKNOWN_FS |
||
63 | halyavin | 1674 | mov [hd1_status], ebx |
1 | ha | 1675 | ret |
1676 | |||
1677 | fat_ok_for_reading: |
||
1678 | ; call reserve_hd1 |
||
1679 | |||
1680 | pushad |
||
1681 | |||
1682 | mov ebx,edx |
||
1683 | call get_cluster_of_a_path |
||
1684 | jc file_to_read_not_found |
||
1685 | |||
1686 | test edi,edi ; read rootdir |
||
1687 | jne no_read_root |
||
1688 | |||
1689 | xor eax,eax |
||
1690 | call get_dir_size ; return rootdir size |
||
1691 | mov [file_size],eax |
||
1692 | mov eax,[ROOT_CLUSTER] |
||
1693 | jmp file_read_start |
||
1694 | |||
1695 | no_read_root: |
||
1696 | mov ebx,PUSHAD_EAX ; file name |
||
1697 | call analyze_directory |
||
1698 | jc file_to_read_not_found |
||
1699 | |||
1700 | mov eax,[ebx+28] ; file size |
||
1701 | test byte [ebx+11],0x10 ; is it directory? |
||
1702 | jz read_set_size ; no |
||
1703 | |||
1704 | mov eax,[ebx+20-2] ; FAT entry |
||
1705 | mov ax,[ebx+26] |
||
1706 | and eax,[fatMASK] |
||
1707 | call get_dir_size |
||
1708 | |||
1709 | read_set_size: |
||
1710 | mov [file_size],eax |
||
1711 | |||
1712 | mov eax,[ebx+20-2] ; FAT entry |
||
1713 | mov ax,[ebx+26] |
||
1714 | and eax,[fatMASK] |
||
1715 | |||
1716 | file_read_start: |
||
1717 | mov ebx,PUSHAD_ECX ; pointer to buffer |
||
1718 | mov edx,PUSHAD_EBX ; file blocks to read |
||
1719 | mov esi,PUSHAD_ESI ; first 512 block to read |
||
1720 | |||
1721 | file_read_new_cluster: |
||
1722 | call get_data_cluster |
||
1723 | jc file_read_eof ; end of file or cluster out of range |
||
1724 | |||
1725 | test edx,edx ; is all read? |
||
1726 | je file_read_OK ; yes |
||
1727 | |||
1728 | call get_FAT ; get next cluster |
||
1729 | cmp eax,[fatRESERVED] ; end of file |
||
1730 | jnb file_read_eof |
||
1731 | cmp eax,2 ; incorrect fat chain |
||
1732 | jnb file_read_new_cluster |
||
1733 | |||
1734 | popad |
||
1735 | mov [hd1_status],0 |
||
1736 | mov ebx,[file_size] |
||
1737 | mov eax,ERROR_FAT_TABLE |
||
1738 | ret |
||
1739 | |||
1740 | file_read_eof: |
||
1741 | popad |
||
1742 | mov [hd1_status],0 |
||
1743 | mov ebx,[file_size] |
||
1744 | mov eax,ERROR_END_OF_FILE |
||
1745 | ret |
||
1746 | |||
1747 | file_read_OK: |
||
1748 | popad |
||
1749 | mov [hd1_status],0 |
||
1750 | mov ebx,[file_size] |
||
1751 | xor eax,eax |
||
1752 | ret |
||
1753 | |||
1754 | file_to_read_not_found: |
||
1755 | popad |
||
1756 | mov [hd1_status],0 |
||
1757 | xor ebx,ebx |
||
1758 | mov eax,ERROR_FILE_NOT_FOUND |
||
1759 | ret |
||
1760 | |||
1761 | |||
1762 | get_dir_size: |
||
1763 | ;----------------------------------------------------- |
||
1764 | ; input : eax = first cluster (0=rootdir) |
||
1765 | ; output : eax = directory size in bytes |
||
1766 | ;----------------------------------------------------- |
||
1767 | push edx |
||
1768 | xor edx,edx ; count of directory clusters |
||
1769 | test eax,eax |
||
1770 | jnz dir_size_next |
||
1771 | |||
1772 | mov eax,[ROOT_SECTORS] |
||
1773 | shl eax,9 ; fat16 rootdir size in bytes |
||
1774 | cmp [fat_type],16 |
||
1775 | je dir_size_ret |
||
1776 | mov eax,[ROOT_CLUSTER] |
||
1777 | |||
1778 | dir_size_next: |
||
1779 | cmp eax,2 ; incorrect fat chain |
||
1780 | jb dir_size_end |
||
1781 | cmp eax,[fatRESERVED] ; end of directory |
||
1782 | ja dir_size_end |
||
1783 | call get_FAT ; get next cluster |
||
1784 | inc edx |
||
1785 | jmp dir_size_next |
||
1786 | |||
1787 | dir_size_end: |
||
1788 | imul eax,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
1789 | imul eax,edx |
||
1790 | |||
1791 | dir_size_ret: |
||
1792 | pop edx |
||
1793 | ret |
||
1794 | |||
1795 | |||
1796 | file_delete: |
||
1797 | ;----------------------------------------------------- |
||
1798 | ; input : eax = file/directory name |
||
1799 | ; edx = path |
||
1800 | ; edi = 1 - allow directory remove else don't remove directory |
||
1801 | ; output : eax = 0 - ok |
||
1802 | ; 3 - unknown FS |
||
1803 | ; 5 - file not found |
||
1804 | ; 10 - access denied |
||
1805 | ;----------------------------------------------------- |
||
1806 | cmp [fat_type],0 |
||
1807 | jnz file_del_fat_ok |
||
1808 | mov eax,ERROR_UNKNOWN_FS |
||
1809 | ret |
||
1810 | |||
1811 | file_del_fat_ok: |
||
1812 | pushad |
||
1813 | |||
1814 | mov ebx,edx |
||
1815 | call get_cluster_of_a_path |
||
1816 | jc file_to_delete_not_found |
||
1817 | |||
1818 | mov ebx,PUSHAD_EAX ; file/directory name |
||
1819 | call analyze_directory |
||
1820 | jc file_to_delete_not_found |
||
1821 | |||
1822 | test byte [ebx+11],0x10 ; is it directory? |
||
1823 | jz delete_notdir ; no. it's file |
||
1824 | cmp edi,1 ; allow directory remove |
||
1825 | jnz delete_no_access ; no |
||
1826 | |||
1827 | push eax ; save directory sector |
||
1828 | mov eax,[ebx+20-2] ; first cluster of file |
||
1829 | mov ax,[ebx+26] ; 0 length files start cluster = 0 |
||
1830 | and eax,[fatMASK] |
||
1831 | xor ebp,ebp ; counter for directory deepnes |
||
1832 | call clear_directory |
||
1833 | pop eax |
||
1834 | jc delete_no_access |
||
1835 | |||
1836 | push ebx ; save directory pointer in buffer |
||
1837 | mov ebx,buffer |
||
1838 | call hd_read ; read directory sector |
||
1839 | pop ebx |
||
1840 | |||
1841 | delete_notdir: |
||
1842 | call delete_entry_name |
||
1843 | mov eax,ecx ; first cluster of file |
||
1844 | call clear_cluster_chain |
||
1845 | popad |
||
1846 | xor eax,eax |
||
1847 | ret |
||
1848 | |||
1849 | delete_no_access: |
||
1850 | popad |
||
1851 | mov eax,ERROR_ACCESS_DENIED |
||
1852 | ret |
||
1853 | |||
1854 | file_to_delete_not_found: |
||
1855 | popad |
||
1856 | mov eax,ERROR_FILE_NOT_FOUND |
||
1857 | ret |
||
1858 | |||
1859 | |||
1860 | clear_cluster_chain: |
||
1861 | ;----------------------------------------------------- |
||
1862 | ; input : eax = first cluster |
||
1863 | ;----------------------------------------------------- |
||
1864 | push eax ecx edx |
||
1865 | xor ecx,ecx ; cluster count |
||
1866 | mov [f_del],1 ; delete on |
||
1867 | |||
1868 | clean_new_chain: |
||
1869 | cmp eax,[LAST_CLUSTER] ; end of file |
||
1870 | ja delete_OK |
||
1871 | cmp eax,2 ; unfinished fat chain or zero length file |
||
1872 | jb delete_OK |
||
1873 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1874 | jz delete_OK |
||
1875 | |||
1876 | xor edx,edx |
||
1877 | call set_FAT ; clear fat entry |
||
1878 | inc ecx ; update cluster count |
||
1879 | mov eax,edx ; old cluster |
||
1880 | jmp clean_new_chain |
||
1881 | |||
1882 | delete_OK: |
||
1883 | call add_disk_free_space ; add clusters to free disk space |
||
1884 | mov [f_del],0 |
||
1885 | pop edx ecx eax |
||
1886 | ret |
||
1887 | |||
1888 | |||
1889 | clear_directory: |
||
1890 | ;----------------------------------------------------- |
||
1891 | ; input : eax = directory cluster |
||
1892 | ; ebp = directory deepnes |
||
1893 | ; Note : use recursive call |
||
1894 | ;----------------------------------------------------- |
||
1895 | pushad |
||
1896 | inc ebp |
||
1897 | cmp ebp,64 ; if over 63 directory deep |
||
1898 | jnb clear_error ; something must be wrong |
||
1899 | |||
1900 | clear_new_cluster: |
||
1901 | cmp eax,[LAST_CLUSTER] |
||
1902 | ja clear_end |
||
1903 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1904 | jz clear_end |
||
1905 | mov esi,eax ; esi = current directory cluster |
||
1906 | sub eax,2 |
||
1907 | jb clear_end |
||
1908 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1909 | imul eax,ecx |
||
1910 | add eax,[DATA_START] |
||
1911 | |||
1912 | clear_new_sector: |
||
1913 | mov edi,eax ; edi = current directory sector |
||
1914 | mov ebx,deltree_buffer |
||
1915 | call hd_read |
||
1916 | mov edx,512/32 ; count of dir entrys per sector = 16 |
||
1917 | |||
1918 | clear_analyze: |
||
1919 | mov al,[ebx+11] ; file attribute |
||
1920 | and al,0xf |
||
1921 | cmp al,0xf |
||
1922 | je clear_long_filename |
||
1923 | |||
1924 | cmp byte [ebx],'.' ; parent or current directory |
||
1925 | je clear_next_entry |
||
1926 | cmp byte [ebx],0xe5 ; deleted |
||
1927 | je clear_next_entry |
||
1928 | cmp byte [ebx],0 ; empty |
||
1929 | je clear_write_last |
||
1930 | ;je clear_next_entry |
||
1931 | |||
1932 | mov eax,[ebx+20-2] ; first cluster of entry |
||
1933 | mov ax,[ebx+26] |
||
1934 | and eax,[fatMASK] |
||
1935 | |||
1936 | test byte [ebx+11],0x10 ; is it directory? |
||
1937 | jz clear_file ; no |
||
1938 | |||
1939 | push eax ebx |
||
1940 | mov eax,edi |
||
1941 | mov ebx,deltree_buffer ; save buffer over recursive call |
||
1942 | call hd_write ; write directory sector to disk |
||
1943 | pop ebx eax |
||
1944 | |||
1945 | call clear_directory ; recursive call !!! |
||
1946 | jc clear_error ; exit if error found |
||
1947 | |||
1948 | push eax ebx |
||
1949 | mov eax,edi |
||
1950 | mov ebx,deltree_buffer |
||
1951 | call hd_read ; read directory sector again |
||
1952 | pop ebx eax |
||
1953 | |||
1954 | clear_file: |
||
1955 | call clear_cluster_chain |
||
1956 | |||
1957 | clear_long_filename: |
||
1958 | mov byte [ebx],0xe5 |
||
1959 | |||
1960 | clear_next_entry: |
||
1961 | add ebx,32 ; position of next dir entry |
||
1962 | dec edx |
||
1963 | jnz clear_analyze |
||
1964 | |||
1965 | mov eax,edi |
||
1966 | mov ebx,deltree_buffer |
||
1967 | call hd_write ; write directory sector to disk |
||
1968 | |||
1969 | inc eax ; next sector |
||
1970 | dec ecx |
||
1971 | jnz clear_new_sector |
||
1972 | |||
1973 | mov eax,esi |
||
1974 | call get_FAT ; get next cluster |
||
1975 | jmp clear_new_cluster ; clear it |
||
1976 | |||
1977 | clear_write_last: |
||
1978 | mov eax,edi |
||
1979 | mov ebx,deltree_buffer |
||
1980 | call hd_write ; write directory sector to disk |
||
1981 | |||
1982 | clear_end: |
||
1983 | popad |
||
1984 | clc |
||
1985 | ret |
||
1986 | |||
1987 | clear_error: |
||
1988 | popad |
||
1989 | stc |
||
1990 | ret |
||
1991 | |||
1992 | |||
1993 | delete_entry_name: |
||
1994 | ;----------------------------------------------------- |
||
1995 | ; input : eax = directory sector |
||
1996 | ; ebx = directory pointer in buffer |
||
1997 | ; longname_sec = 2 previous directory sectors |
||
1998 | ; output : ecx = first cluster |
||
1999 | ; change : eax,ebx,edx |
||
2000 | ;----------------------------------------------------- |
||
2001 | mov byte [ebx],0xe5 |
||
2002 | mov ecx,[ebx+20-2] ; first cluster of file |
||
2003 | mov cx,[ebx+26] ; 0 length files start cluster = 0 |
||
2004 | and ecx,[fatMASK] |
||
2005 | |||
2006 | delete_empty: |
||
2007 | sub ebx,32 |
||
2008 | cmp ebx,buffer |
||
2009 | jnb delete_test_long |
||
2010 | |||
2011 | mov ebx,buffer |
||
2012 | call hd_write ; write directory sector back |
||
2013 | xor eax,eax |
||
2014 | xchg eax,[longname_sec2] |
||
2015 | xchg eax,[longname_sec1] |
||
2016 | test eax,eax ; is there previous directory sector? |
||
2017 | jz delete_name_end ; no |
||
2018 | |||
2019 | mov ebx,buffer |
||
2020 | call hd_read ; read previous sector |
||
2021 | mov ebx,buffer+0x1e0 ; start from last entry |
||
2022 | |||
2023 | delete_test_long: |
||
2024 | mov dh,[ebx+11] ; file attribute |
||
2025 | and dh,0xf |
||
2026 | cmp dh,0xf |
||
2027 | jne delete_write_buffer |
||
2028 | |||
2029 | cmp byte [ebx],0x40 ; end of long dir entry? |
||
2030 | mov byte [ebx],0xe5 |
||
2031 | jb delete_empty |
||
2032 | |||
2033 | delete_write_buffer: |
||
2034 | mov ebx,buffer |
||
2035 | call hd_write ; write directory sector back |
||
2036 | |||
2037 | delete_name_end: |
||
2038 | ret |
||
2039 | |||
2040 | |||
2041 | rename: |
||
2042 | ;----------------------------------------------------------- |
||
2043 | ; input : eax = source directory name |
||
2044 | ; edx = source path |
||
2045 | ; ebx = dest directory name |
||
2046 | ; edi = dest path |
||
2047 | ; output : eax = 0 - ok |
||
2048 | ; 3 - unknown FS |
||
2049 | ; 5 - file not found |
||
2050 | ; 8 - disk full |
||
2051 | ; 10 - access denied |
||
2052 | ;----------------------------------------------------------- |
||
2053 | cmp [fat_type],0 |
||
2054 | jnz fat_ok_for_rename |
||
2055 | mov eax,ERROR_UNKNOWN_FS |
||
2056 | ret |
||
2057 | |||
2058 | fat_ok_for_rename: |
||
2059 | ; call reserve_hd1 |
||
2060 | |||
2061 | pushad |
||
2062 | |||
2063 | mov ebx,edx ; source path |
||
2064 | call get_cluster_of_a_path |
||
2065 | jc rename_entry_not_found |
||
2066 | |||
2067 | mov ebx,PUSHAD_EAX ; source directory name |
||
2068 | call analyze_directory |
||
2069 | jc rename_entry_not_found |
||
2070 | |||
2071 | mov [sector_tmp],eax ; save source sector |
||
2072 | mov [entry_pos],ebx |
||
2073 | mov esi,ebx |
||
2074 | mov edi,dir_entry |
||
2075 | mov ecx,32/4 |
||
2076 | cld |
||
2077 | rep movsd ; save entry |
||
2078 | |||
2079 | mov ebx,PUSHAD_EDI ; dest path |
||
2080 | call get_cluster_of_a_path |
||
2081 | jc rename_entry_not_found |
||
2082 | |||
2083 | mov edx,eax ; save dest directory cluster |
||
2084 | mov ebx,PUSHAD_EBX ; dest directory name |
||
2085 | push [longname_sec1] |
||
2086 | push [longname_sec2] |
||
2087 | call analyze_directory ; check if entry already exist |
||
2088 | pop [longname_sec2] |
||
2089 | pop [longname_sec1] |
||
2090 | jnc rename_entry_already_exist |
||
2091 | |||
2092 | mov eax,edx |
||
2093 | call analyze_directory_to_write |
||
2094 | jc rename_disk_full |
||
2095 | |||
2096 | mov esi,dir_entry |
||
2097 | mov edi,ebx |
||
2098 | mov ecx,32/4 |
||
2099 | cld |
||
2100 | rep movsd ; copy entry |
||
2101 | mov esi,PUSHAD_EBX ; dest directory name |
||
2102 | mov edi,ebx |
||
2103 | mov ecx,11 |
||
2104 | rep movsb ; copy name |
||
2105 | |||
2106 | mov ebx,buffer ; save the directory name,length,cluster |
||
2107 | call hd_write |
||
2108 | |||
2109 | test byte [dir_entry+11],0x10 ; is it directory? |
||
2110 | jz rename_not_dir ; no |
||
2111 | mov eax,[dir_entry+20-2] ; FAT entry |
||
2112 | mov ax,[dir_entry+26] |
||
2113 | and eax,[fatMASK] |
||
2114 | call change_2dot_cluster |
||
2115 | |||
2116 | rename_not_dir: |
||
2117 | mov eax,[sector_tmp] |
||
2118 | mov ebx,buffer |
||
2119 | call hd_read ; read source directory sector |
||
2120 | |||
2121 | mov ebx,[entry_pos] |
||
2122 | call delete_entry_name |
||
2123 | |||
2124 | popad |
||
2125 | call update_disk ; write all of cache and fat to hd |
||
2126 | mov [hd1_status],0 |
||
2127 | xor eax,eax |
||
2128 | ret |
||
2129 | |||
2130 | rename_entry_not_found: |
||
2131 | popad |
||
2132 | mov [hd1_status],0 |
||
2133 | mov eax,ERROR_FILE_NOT_FOUND |
||
2134 | ret |
||
2135 | |||
2136 | rename_entry_already_exist: |
||
2137 | popad |
||
2138 | mov [hd1_status],0 |
||
2139 | mov eax,ERROR_ACCESS_DENIED |
||
2140 | ret |
||
2141 | |||
2142 | rename_disk_full: |
||
2143 | popad |
||
2144 | mov [hd1_status],0 |
||
2145 | mov eax,ERROR_DISK_FULL |
||
2146 | ret |
||
2147 | |||
2148 | |||
2149 | change_2dot_cluster: |
||
2150 | ;----------------------------------------------------------- |
||
2151 | ; input : eax = directory cluster |
||
2152 | ; edx = value to save |
||
2153 | ; change : eax,ebx,edx |
||
2154 | ;----------------------------------------------------------- |
||
2155 | cmp eax,[LAST_CLUSTER] |
||
2156 | ja not_2dot ; too big cluster number, something is wrong |
||
2157 | sub eax,2 |
||
2158 | jb not_2dot |
||
2159 | |||
2160 | imul eax,[SECTORS_PER_CLUSTER] |
||
2161 | add eax,[DATA_START] |
||
2162 | mov ebx,buffer |
||
2163 | call hd_read |
||
2164 | |||
2165 | cmp dword [ebx+32],'.. ' |
||
2166 | jnz not_2dot |
||
2167 | |||
2168 | cmp edx,[ROOT_CLUSTER] ; is rootdir cluster? |
||
2169 | jne not_2dot_root |
||
2170 | xor edx,edx ; yes. set it zero |
||
2171 | |||
2172 | not_2dot_root: |
||
2173 | mov [ebx+32+26],dx ; 16 bits low of cluster |
||
2174 | shr edx,16 |
||
2175 | mov [ebx+32+20],dx ; 16 bits high of cluster (=0 fat16) |
||
2176 | call hd_write |
||
2177 | |||
2178 | not_2dot: |
||
2179 | ret |
||
2180 | |||
2181 | |||
2182 | get_filesize: |
||
2183 | ;----------------------------------------------------------- |
||
2184 | ; input : eax = file name |
||
2185 | ; edx = path |
||
2186 | ; edi = if 0 - read rootdir else normal dir/file size |
||
2187 | ; output : eax = 0 - ok |
||
2188 | ; 3 - unknown FS |
||
2189 | ; 5 - file not found |
||
2190 | ; ebx = file size |
||
2191 | ;----------------------------------------------------------- |
||
2192 | cmp [fat_type],0 |
||
2193 | jnz get_filesize_fat_ok |
||
2194 | xor ebx,ebx |
||
2195 | mov eax,ERROR_UNKNOWN_FS |
||
2196 | ret |
||
2197 | |||
2198 | get_filesize_fat_ok: |
||
2199 | ; call reserve_hd1 |
||
2200 | |||
2201 | pushad |
||
2202 | xor eax,eax |
||
2203 | test edi,edi ; is read rootdir? |
||
2204 | je get_filesize_dirsize ; yes |
||
2205 | |||
2206 | get_filesize_no_root: |
||
2207 | mov ebx,edx |
||
2208 | call get_cluster_of_a_path |
||
2209 | jc get_filesize_not_found |
||
2210 | |||
2211 | mov ebx,PUSHAD_EAX ; file name |
||
2212 | call analyze_directory |
||
2213 | jc get_filesize_not_found |
||
2214 | |||
2215 | mov eax,[ebx+28] ; file size |
||
2216 | test byte [ebx+11],0x10 ; is it directory? |
||
2217 | jz get_filesize_set_size ; no |
||
2218 | |||
2219 | mov eax,[ebx+20-2] ; FAT entry |
||
2220 | mov ax,[ebx+26] |
||
2221 | and eax,[fatMASK] |
||
2222 | |||
2223 | get_filesize_dirsize: |
||
2224 | call get_dir_size |
||
2225 | |||
2226 | get_filesize_set_size: |
||
2227 | mov PUSHAD_EBX,eax |
||
2228 | popad |
||
2229 | mov [hd1_status],0 |
||
2230 | xor eax,eax |
||
2231 | ret |
||
2232 | |||
2233 | get_filesize_not_found: |
||
2234 | popad |
||
2235 | mov [hd1_status],0 |
||
2236 | xor ebx,ebx |
||
2237 | mov eax,ERROR_FILE_NOT_FOUND |
||
2238 | ret |
||
2239 | |||
2240 | |||
2241 | get_fileattr: |
||
2242 | ;----------------------------------------------------------- |
||
2243 | ; input : eax = file name |
||
2244 | ; edx = path |
||
2245 | ; output : eax = 0 - ok |
||
2246 | ; 3 - unknown FS |
||
2247 | ; 5 - file not found |
||
2248 | ; ebx = file attribute |
||
2249 | ;----------------------------------------------------------- |
||
2250 | cmp [fat_type],0 |
||
2251 | jnz get_fileattr_fat_ok |
||
2252 | xor ebx,ebx |
||
2253 | mov eax,ERROR_UNKNOWN_FS |
||
2254 | ret |
||
2255 | |||
2256 | get_fileattr_fat_ok: |
||
2257 | ; call reserve_hd1 |
||
2258 | |||
2259 | pushad |
||
2260 | mov ebx,edx |
||
2261 | call get_cluster_of_a_path |
||
2262 | jc get_fileattr_not_found |
||
2263 | |||
2264 | mov ebx,PUSHAD_EAX ; file name |
||
2265 | call analyze_directory |
||
2266 | jc get_fileattr_not_found |
||
2267 | |||
2268 | movzx eax,byte [ebx+11] ; file attribute |
||
2269 | mov PUSHAD_EBX,eax |
||
2270 | popad |
||
2271 | mov [hd1_status],0 |
||
2272 | xor eax,eax |
||
2273 | ret |
||
2274 | |||
2275 | get_fileattr_not_found: |
||
2276 | popad |
||
2277 | mov [hd1_status],0 |
||
2278 | xor ebx,ebx |
||
2279 | mov eax,ERROR_FILE_NOT_FOUND |
||
2280 | ret |
||
2281 | |||
2282 | |||
2283 | get_filedate: |
||
2284 | ;----------------------------------------------------------- |
||
2285 | ; input : eax = file name |
||
2286 | ; edx = path |
||
2287 | ; output : eax = 0 - ok |
||
2288 | ; 3 - unknown FS |
||
2289 | ; 5 - file not found |
||
2290 | ; ebx = file date/time |
||
2291 | ; bits 31..25 = year-1980 |
||
2292 | ; bits 24..21 = month |
||
2293 | ; bits 20..16 = day |
||
2294 | ; bits 15..11 = hour |
||
2295 | ; bits 10..5 = minute |
||
2296 | ; bits 4..0 = second/2 |
||
2297 | ;----------------------------------------------------------- |
||
2298 | cmp [fat_type],0 |
||
2299 | jnz get_filedate_fat_ok |
||
2300 | xor ebx,ebx |
||
2301 | mov eax,ERROR_UNKNOWN_FS |
||
2302 | ret |
||
2303 | |||
2304 | get_filedate_fat_ok: |
||
2305 | ; call reserve_hd1 |
||
2306 | |||
2307 | pushad |
||
2308 | mov ebx,edx |
||
2309 | call get_cluster_of_a_path |
||
2310 | jc get_filedate_not_found |
||
2311 | |||
2312 | mov ebx,PUSHAD_EAX ; file name |
||
2313 | call analyze_directory |
||
2314 | jc get_filedate_not_found |
||
2315 | |||
2316 | mov eax,[ebx+22] ; file date/time |
||
2317 | mov PUSHAD_EBX,eax |
||
2318 | popad |
||
2319 | mov [hd1_status],0 |
||
2320 | xor eax,eax |
||
2321 | ret |
||
2322 | |||
2323 | get_filedate_not_found: |
||
2324 | popad |
||
2325 | mov [hd1_status],0 |
||
2326 | xor ebx,ebx |
||
2327 | mov eax,ERROR_FILE_NOT_FOUND |
||
2328 | ret |
||
2329 | |||
2330 | |||
2331 | get_hd_info: |
||
2332 | ;----------------------------------------------------------- |
||
2333 | ; output : eax = 0 - ok |
||
2334 | ; 3 - unknown FS |
||
2335 | ; edx = cluster size in bytes |
||
2336 | ; ebx = total clusters on disk |
||
2337 | ; ecx = free clusters on disk |
||
2338 | ;----------------------------------------------------------- |
||
2339 | cmp [fat_type],0 |
||
2340 | jnz info_fat_ok |
||
2341 | xor edx,edx |
||
2342 | xor ebx,ebx |
||
2343 | xor ecx,ecx |
||
2344 | mov eax,ERROR_UNKNOWN_FS |
||
2345 | ret |
||
2346 | |||
2347 | info_fat_ok: |
||
2348 | ; call reserve_hd1 |
||
2349 | |||
2350 | xor ecx,ecx ; count of free clusters |
||
2351 | mov eax,2 |
||
2352 | mov ebx,[LAST_CLUSTER] |
||
2353 | |||
2354 | info_cluster: |
||
2355 | push eax |
||
2356 | call get_FAT ; get cluster info |
||
2357 | test eax,eax ; is it free? |
||
2358 | jnz info_used ; no |
||
2359 | inc ecx |
||
2360 | |||
2361 | info_used: |
||
2362 | pop eax |
||
2363 | inc eax |
||
2364 | cmp eax,ebx ; is above last cluster? |
||
2365 | jbe info_cluster ; no. test next cluster |
||
2366 | |||
2367 | dec ebx ; cluster count |
||
2368 | imul edx,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
2369 | mov [hd1_status],0 |
||
2370 | xor eax,eax |
||
2371 | ret |
||
2372 | |||
2373 | |||
2374 | update_disk: |
||
2375 | ;----------------------------------------------------------- |
||
2376 | ; write changed fat and cache to disk |
||
2377 | ;----------------------------------------------------------- |
||
2378 | cmp [fat_change],0 ; is fat changed? |
||
2379 | je upd_no_change |
||
2380 | |||
2381 | call write_fat_sector |
||
2382 | |||
2383 | upd_no_change: |
||
2384 | |||
2385 | call write_cache |
||
2386 | ret |
||
2387 | |||
2388 | |||
2389 | ;************************************************************************** |
||
2390 | ; |
||
2391 | ; 0x600008 - first entry in cache list |
||
2392 | ; |
||
2393 | ; +0 - lba sector |
||
2394 | ; +4 - state of cache sector |
||
2395 | ; 0 = empty |
||
2396 | ; 1 = used for read ( same as in hd ) |
||
2397 | ; 2 = used for write ( differs from hd ) |
||
2398 | ; |
||
2399 | ; +65536 - cache entries |
||
2400 | ; |
||
2401 | ;************************************************************************** |
||
2402 | |||
2403 | |||
2404 | hd_read: |
||
2405 | ;----------------------------------------------------------- |
||
2406 | ; input : eax = block to read |
||
2407 | ; ebx = destination |
||
2408 | ;----------------------------------------------------------- |
||
2409 | push ecx esi edi ; scan cache |
||
2410 | |||
2411 | mov ecx,cache_max ; entries in cache |
||
2412 | mov esi,0x600000+8 |
||
2413 | mov edi,1 |
||
2414 | |||
2415 | hdreadcache: |
||
2416 | |||
2417 | cmp dword [esi+4],0 ; empty |
||
2418 | je nohdcache |
||
2419 | |||
2420 | cmp [esi],eax ; correct sector |
||
2421 | je yeshdcache |
||
2422 | |||
2423 | nohdcache: |
||
2424 | |||
2425 | add esi,8 |
||
2426 | inc edi |
||
2427 | dec ecx |
||
2428 | jnz hdreadcache |
||
2429 | |||
2430 | call find_empty_slot ; ret in edi |
||
2431 | |||
2432 | call wait_for_hd_idle |
||
2433 | push eax edx |
||
2434 | |||
2435 | cli |
||
2436 | xor eax,eax |
||
2437 | mov edx,[hdbase] |
||
2438 | inc edx |
||
2439 | out dx,al ; ATAFeatures ðåãèñòð "îñîáåííîñòåé" |
||
2440 | inc edx |
||
2441 | inc eax |
||
2442 | out dx,al ; ATASectorCount ñ÷åò÷èê ñåêòîðîâ |
||
2443 | inc edx |
||
2444 | mov eax,[esp+4] |
||
2445 | out dx,al ; ATASectorNumber ðåãèñòð íîìåðà ñåêòîðà |
||
2446 | shr eax,8 |
||
2447 | inc edx |
||
2448 | out dx,al ; ATACylinder íîìåð öèëèíäðà (ìëàäøèé áàéò) |
||
2449 | shr eax,8 |
||
2450 | inc edx |
||
2451 | out dx,al ; íîìåð öèëèíäðà (ñòàðøèé áàéò) |
||
2452 | shr eax,8 |
||
2453 | inc edx |
||
2454 | and al,1+2+4+8 |
||
2455 | add al,byte [hdid] |
||
2456 | add al,128+64+32 |
||
2457 | out dx,al ; íîìåð ãîëîâêè/íîìåð äèñêà |
||
2458 | inc edx |
||
2459 | mov al,20h |
||
2460 | out dx,al ; ATACommand ðåãèñòð êîìàíä |
||
2461 | sti |
||
2462 | |||
2463 | call wait_for_sector_buffer |
||
2464 | |||
2465 | cmp [hd_error],0 |
||
2466 | jne hd_read_error |
||
2467 | |||
2468 | cli |
||
2469 | push edi |
||
2470 | shl edi,9 |
||
2471 | add edi,0x600000+65536 |
||
2472 | mov ecx,256 |
||
2473 | mov edx,[hdbase] |
||
2474 | cld |
||
2475 | rep insw |
||
2476 | pop edi |
||
2477 | sti |
||
2478 | |||
2479 | pop edx eax |
||
2480 | blok_read_2: |
||
2481 | lea esi,[edi*8+0x600000] |
||
2482 | mov [esi],eax ; sector number |
||
2483 | mov dword [esi+4],1 ; hd read - mark as same as in hd |
||
2484 | |||
2485 | yeshdcache: |
||
2486 | |||
2487 | mov esi,edi |
||
2488 | shl esi,9 |
||
2489 | add esi,0x600000+65536 |
||
2490 | mov edi,ebx |
||
2491 | mov ecx,512/4 |
||
2492 | cld |
||
2493 | rep movsd ; move data |
||
2494 | ; blok_read_2: |
||
2495 | pop edi esi ecx |
||
2496 | ret |
||
2497 | |||
2498 | |||
2499 | hd_write: |
||
2500 | ;----------------------------------------------------------- |
||
2501 | ; input : eax = block |
||
2502 | ; ebx = pointer to memory |
||
2503 | ;----------------------------------------------------------- |
||
2504 | push ecx esi edi |
||
2505 | |||
2506 | ; check if the cache already has the sector and overwrite it |
||
2507 | |||
2508 | mov ecx,cache_max |
||
2509 | mov esi,0x600000+8 |
||
2510 | mov edi,1 |
||
2511 | |||
2512 | hdwritecache: |
||
2513 | |||
2514 | cmp dword [esi+4],0 ; if cache slot is empty |
||
2515 | je not_in_cache_write |
||
2516 | |||
2517 | cmp [esi],eax ; if the slot has the sector |
||
2518 | je yes_in_cache_write |
||
2519 | |||
2520 | not_in_cache_write: |
||
2521 | |||
2522 | add esi,8 |
||
2523 | inc edi |
||
2524 | dec ecx |
||
2525 | jnz hdwritecache |
||
2526 | |||
2527 | ; sector not found in cache |
||
2528 | ; write the block to a new location |
||
2529 | |||
2530 | call find_empty_slot ; ret in edi |
||
2531 | |||
2532 | lea esi,[edi*8+0x600000] |
||
2533 | mov [esi],eax ; sector number |
||
2534 | |||
2535 | yes_in_cache_write: |
||
2536 | |||
2537 | mov dword [esi+4],2 ; write - differs from hd |
||
2538 | |||
2539 | shl edi,9 |
||
2540 | add edi,0x600000+65536 |
||
2541 | mov esi,ebx |
||
2542 | mov ecx,512/4 |
||
2543 | cld |
||
2544 | rep movsd ; move data |
||
2545 | |||
2546 | pop edi esi ecx |
||
2547 | ret |
||
2548 | |||
2549 | |||
2550 | write_cache: |
||
2551 | ;----------------------------------------------------------- |
||
2552 | ; write all changed sectors to disk |
||
2553 | ;----------------------------------------------------------- |
||
2554 | push eax ecx edx esi edi |
||
2555 | |||
2556 | ; write difference ( 2 ) from cache to hd |
||
2557 | |||
2558 | mov ecx,cache_max |
||
2559 | mov esi,0x600000+8 |
||
2560 | mov edi,1 |
||
2561 | |||
2562 | write_cache_more: |
||
2563 | |||
2564 | cmp dword [esi+4],2 ; if cache slot is not different |
||
2565 | jne does_not_need_writing |
||
2566 | |||
2567 | mov dword [esi+4],1 ; same as in hd |
||
2568 | mov eax,[esi] ; eax = sector to write |
||
2569 | |||
2570 | cmp eax,[PARTITION_START] |
||
2571 | jb danger |
||
2572 | cmp eax,[PARTITION_END] |
||
2573 | ja danger |
||
2574 | |||
2575 | call wait_for_hd_idle |
||
2576 | |||
2577 | cli |
||
2578 | xor eax,eax |
||
2579 | mov edx,[hdbase] |
||
2580 | inc edx |
||
2581 | out dx,al |
||
2582 | inc edx |
||
2583 | inc eax |
||
2584 | out dx,al |
||
2585 | inc edx |
||
2586 | mov eax,[esi] ; eax = sector to write |
||
2587 | out dx,al |
||
2588 | shr eax,8 |
||
2589 | inc edx |
||
2590 | out dx,al |
||
2591 | shr eax,8 |
||
2592 | inc edx |
||
2593 | out dx,al |
||
2594 | shr eax,8 |
||
2595 | inc edx |
||
2596 | and al,1+2+4+8 |
||
2597 | add al,byte [hdid] |
||
2598 | add al,128+64+32 |
||
2599 | out dx,al |
||
2600 | inc edx |
||
2601 | mov al,30h |
||
2602 | out dx,al |
||
2603 | sti |
||
2604 | |||
2605 | call wait_for_sector_buffer |
||
2606 | |||
2607 | cmp [hd_error],0 |
||
2608 | jne hd_write_error |
||
2609 | |||
2610 | push ecx esi |
||
2611 | |||
2612 | cli |
||
2613 | mov esi,edi |
||
2614 | shl esi,9 |
||
2615 | add esi,0x600000+65536 ; esi = from memory position |
||
2616 | mov ecx,256 |
||
2617 | mov edx,[hdbase] |
||
2618 | cld |
||
2619 | rep outsw |
||
2620 | sti |
||
2621 | |||
2622 | pop esi ecx |
||
2623 | |||
2624 | danger: |
||
2625 | does_not_need_writing: |
||
2626 | |||
2627 | add esi,8 |
||
2628 | inc edi |
||
2629 | dec ecx |
||
2630 | jnz write_cache_more |
||
2631 | |||
2632 | pop edi esi edx ecx eax |
||
2633 | ret |
||
2634 | |||
2635 | |||
2636 | find_empty_slot: |
||
2637 | ;----------------------------------------------------------- |
||
2638 | ; find empty or read slot, flush cache if next 10% is used by write |
||
2639 | ; output : edi = cache slot |
||
2640 | ;----------------------------------------------------------- |
||
2641 | push ecx esi |
||
2642 | |||
2643 | search_again: |
||
2644 | |||
2645 | mov ecx,cache_max*10/100 |
||
2646 | mov edi,[cache_search_start] |
||
2647 | |||
2648 | search_for_empty: |
||
2649 | |||
2650 | inc edi |
||
2651 | cmp edi,cache_max |
||
2652 | jbe inside_cache |
||
2653 | mov edi,1 |
||
2654 | |||
2655 | inside_cache: |
||
2656 | |||
2657 | cmp dword [edi*8+0x600000+4],2 ; get cache slot info |
||
2658 | jb found_slot ; it's empty or read |
||
2659 | dec ecx |
||
2660 | jnz search_for_empty |
||
2661 | |||
2662 | call write_cache ; no empty slots found, write all |
||
2663 | jmp search_again ; and start again |
||
2664 | |||
2665 | found_slot: |
||
2666 | |||
2667 | mov [cache_search_start],edi |
||
2668 | |||
2669 | pop esi ecx |
||
2670 | ret |
||
2671 | |||
2672 | |||
2673 | save_hd_wait_timeout: |
||
2674 | |||
2675 | push eax |
||
2676 | mov eax,[timer_ticks];[0xfdf0] |
||
2677 | add eax,300 ; 3 sec timeout |
||
2678 | mov [hd_wait_timeout],eax |
||
2679 | pop eax |
||
2680 | ret |
||
2681 | |||
2682 | |||
2683 | check_hd_wait_timeout: |
||
2684 | |||
2685 | push eax |
||
2686 | mov eax,[hd_wait_timeout] |
||
2687 | cmp [timer_ticks], eax ;[0xfdf0],eax |
||
2688 | jg hd_timeout_error |
||
2689 | pop eax |
||
2690 | ret |
||
2691 | |||
2692 | iglobal |
||
2693 | hd_timeout_str db 'K : FS - HD timeout',13,10,0 |
||
2694 | hd_read_str db 'K : FS - HD read error',13,10,0 |
||
2695 | hd_write_str db 'K : FS - HD write error',13,10,0 |
||
2696 | endg |
||
2697 | |||
2698 | hd_timeout_error: |
||
2699 | |||
2700 | call clear_hd_cache |
||
2701 | call clear_application_table_status |
||
2702 | mov esi,hd_timeout_str |
||
2703 | call sys_msg_board_str |
||
2704 | jmp $ |
||
2705 | |||
2706 | |||
2707 | hd_read_error: |
||
2708 | |||
2709 | call clear_hd_cache |
||
2710 | call clear_application_table_status |
||
2711 | mov esi,hd_read_str |
||
2712 | call sys_msg_board_str |
||
2713 | jmp $ |
||
2714 | |||
2715 | hd_write_error: |
||
2716 | |||
2717 | call clear_hd_cache |
||
2718 | call clear_application_table_status |
||
2719 | mov esi,hd_write_str |
||
2720 | call sys_msg_board_str |
||
2721 | jmp $ |
||
2722 | |||
2723 | |||
2724 | |||
2725 | |||
2726 | wait_for_hd_idle: |
||
2727 | |||
2728 | push eax edx |
||
2729 | |||
2730 | call save_hd_wait_timeout |
||
2731 | |||
2732 | mov edx,[hdbase] |
||
2733 | add edx,0x7 |
||
2734 | |||
2735 | wfhil1: |
||
2736 | |||
2737 | call check_hd_wait_timeout |
||
2738 | |||
2739 | in al,dx |
||
2740 | test al,128 |
||
2741 | jnz wfhil1 |
||
2742 | |||
2743 | pop edx eax |
||
2744 | ret |
||
2745 | |||
2746 | |||
2747 | wait_for_sector_buffer: |
||
2748 | |||
2749 | push eax edx |
||
2750 | |||
2751 | mov edx,[hdbase] |
||
2752 | add edx,0x7 |
||
2753 | |||
2754 | call save_hd_wait_timeout |
||
2755 | |||
2756 | hdwait_sbuf: ; wait for sector buffer to be ready |
||
2757 | |||
2758 | call check_hd_wait_timeout |
||
2759 | |||
2760 | in al,dx |
||
2761 | test al,8 |
||
2762 | jz hdwait_sbuf |
||
2763 | |||
2764 | mov [hd_error],0 |
||
2765 | |||
2766 | cmp [hd_setup],1 ; do not mark error for setup request |
||
2767 | je buf_wait_ok |
||
2768 | |||
2769 | test al,1 ; previous command ended up with an error |
||
2770 | jz buf_wait_ok |
||
2771 | mov [hd_error],1 |
||
2772 | |||
2773 | buf_wait_ok: |
||
2774 | |||
2775 | pop edx eax |
||
2776 | ret |
||
2777 | |||
2778 | |||
2779 | |||
2780 | read_hd_file: |
||
2781 | ;----------------------------------------------------------------- |
||
2782 | ; |
||
2783 | ; Converting old reading function for hd-application start. |
||
2784 | ; |
||
2785 | ; IN: |
||
2786 | ; |
||
2787 | ; eax - pointer to file (0 = read only first sector of drive: eg 'label') |
||
2788 | ; ebx - file lenght |
||
2789 | ; ecx - start 512 byte block number |
||
2790 | ; edx - number of blocks to read |
||
2791 | ; esi - pointer to return/work area (atleast 20 000 bytes) |
||
2792 | ; |
||
2793 | ; For new read function |
||
2794 | ; |
||
2795 | ; EAX (PAR0) pointer to file-name |
||
2796 | ; ECX (PAR1) pointer to buffer |
||
2797 | ; EBX (PAR2) vt file blocks to read |
||
2798 | ; EDX (PAR3) pointer to path |
||
2799 | ; ESI vt first 512 block to read |
||
2800 | ; EDI if 0 - return root |
||
2801 | ;-------------------------------------------------------------------------- |
||
2802 | |||
2803 | push ecx esi edi |
||
2804 | mov esi,eax |
||
2805 | mov edi,startpath |
||
2806 | mov ecx,250 |
||
2807 | cld |
||
2808 | rep movsb |
||
2809 | pop edi esi ecx |
||
2810 | |||
2811 | mov eax,startpath |
||
2812 | mov [eax+ebx-12],byte 0 |
||
2813 | |||
2814 | push eax ebx ecx edx esi |
||
2815 | |||
2816 | pop ecx ; pointer to buffer |
||
2817 | add ecx,1024 |
||
2818 | pop ebx ; number of blocks to read |
||
2819 | pop esi ; first block to read |
||
2820 | dec esi |
||
2821 | pop eax ; file length |
||
2822 | pop edx ; pointer to path |
||
2823 | |||
2824 | mov edi,12 |
||
2825 | lea eax,[eax+edx-12+1] |
||
2826 | call file_read |
||
2827 | |||
2828 | ret>>>>65536 |
||
2829 |