Rev 77 | Rev 83 | 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 ;; |
||
75 | diamond | 10 | ;; 04.05.2006 LFN read folder - diamond ;; |
74 | mario79 | 11 | ;; 29.04.2006 Elimination of hangup after the ;; |
12 | ;; expiration hd_wait_timeout - Mario79 ;; |
||
75 | diamond | 13 | ;; 23.04.2006 LFN read file - diamond ;; |
65 | mario79 | 14 | ;; 28.01.2006 find all Fat16/32 partition in all input point ;; |
15 | ;; to MBR, see file part_set.inc - Mario79 ;; |
||
1 | ha | 16 | ;; 15.01.2005 get file size/attr/date, file_append - ATV ;; |
17 | ;; 04.12.2004 skip volume label, file delete bug fixed - ATV ;; |
||
18 | ;; 29.11.2004 get_free_FAT changed, append dir bug fixed - ATV ;; |
||
19 | ;; 23.11.2004 don't allow overwrite dir with file - ATV ;; |
||
20 | ;; 18.11.2004 get_disk_info and more error codes - ATV ;; |
||
21 | ;; 17.11.2004 set_FAT/get_FAT and disk cache rewritten - ATV ;; |
||
22 | ;; 10.11.2004 removedir clear whole directory structure - ATV ;; |
||
23 | ;; 08.11.2004 rename - ATV ;; |
||
24 | ;; 30.10.2004 file_read return also dirsize in bytes - ATV ;; |
||
25 | ;; 20.10.2004 Makedir/Removedir - ATV ;; |
||
26 | ;; 14.10.2004 Partition chain/Fat16 - ATV (thanks drh3xx) ;; |
||
27 | ;; 06.9.2004 Fix free space by Mario79 added - MH ;; |
||
28 | ;; 24.5.2004 Write back buffer for File_write -VT ;; |
||
29 | ;; 20.5.2004 File_read function to work with syscall 58 - VT ;; |
||
30 | ;; 30.3.2004 Error parameters at function return - VT ;; |
||
31 | ;; 01.5.2002 Bugfix in device write - VT ;; |
||
32 | ;; 20.5.2002 Hd status check - VT ;; |
||
33 | ;; 29.6.2002 Improved fat32 verification - VT ;; |
||
34 | ;; ;; |
||
35 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
||
36 | |||
37 | cache_max equ 1919 ; max. is 1919*512+0x610000=0x6ffe00 |
||
38 | |||
52 | mikedld | 39 | ERROR_SUCCESS = 0 |
40 | ERROR_DISK_BASE = 1 |
||
41 | ERROR_UNSUPPORTED_FS = 2 |
||
42 | ERROR_UNKNOWN_FS = 3 |
||
43 | ERROR_PARTITION = 4 |
||
44 | ERROR_FILE_NOT_FOUND = 5 |
||
45 | ERROR_END_OF_FILE = 6 |
||
46 | ERROR_MEMORY_POINTER = 7 |
||
47 | ERROR_DISK_FULL = 8 |
||
48 | ERROR_FAT_TABLE = 9 |
||
49 | ERROR_ACCESS_DENIED = 10 |
||
1 | ha | 50 | |
51 | PUSHAD_EAX equ [esp+28] |
||
52 | PUSHAD_ECX equ [esp+24] |
||
53 | PUSHAD_EDX equ [esp+20] |
||
54 | PUSHAD_EBX equ [esp+16] |
||
55 | PUSHAD_EBP equ [esp+8] |
||
56 | PUSHAD_ESI equ [esp+4] |
||
57 | PUSHAD_EDI equ [esp+0] |
||
58 | |||
59 | cluster dd 0 ; used by file_write,makedir,append |
||
60 | partition_count dd 0 ; partitions found by set_FAT32_variables |
||
61 | longname_sec1 dd 0 ; used by analyze_directory to save 2 previous |
||
62 | longname_sec2 dd 0 ; directory sectors for delete long filename |
||
63 | |||
64 | hd_error dd 0 ; set by wait_for_sector_buffer |
||
65 | hd_setup dd 0 |
||
66 | hd_wait_timeout dd 0 |
||
67 | |||
68 | cluster_tmp dd 0 ; used by analyze_directory |
||
69 | ; and analyze_directory_to_write |
||
70 | |||
71 | file_size dd 0 ; used by file_read |
||
72 | |||
73 | sector_tmp dd 0 ; used by rename,append,file_write |
||
74 | entry_pos dd 0 ; used by rename,append,file_write |
||
75 | |||
76 | old_filesize dd 0 ; used by append |
||
77 | new_filepos dd 0 ; used by append |
||
78 | bytes2write dd 0 ; used by append |
||
79 | |||
80 | cache_search_start dd 0 ; used by find_empty_slot |
||
81 | |||
82 | fat_in_cache dd -1 |
||
83 | fat_cache: times 512 db 0 |
||
84 | |||
85 | uglobal |
||
86 | Sector512: ; label for dev_hdcd.inc |
||
87 | buffer: times 512 db 0 |
||
88 | deltree_buffer: times 512 db 0 |
||
89 | endg |
||
90 | |||
91 | iglobal |
||
92 | NewDirEntry1 db ". ",0x10 |
||
93 | times 20 db 0 |
||
94 | NewDirEntry2 db ".. ",0x10 |
||
95 | times 20 db 0 |
||
96 | endg |
||
97 | |||
98 | uglobal |
||
99 | dir_entry: times 32 db 0 |
||
100 | |||
101 | startpath: times 255 db 0 |
||
102 | |||
103 | fat16_root db 0 ; flag for fat16 rootdir |
||
104 | f_del db 0 ; 1=overwrite fat entry |
||
105 | fat_change db 0 ; 1=fat has changed |
||
106 | |||
107 | endg |
||
108 | |||
109 | reserve_hd1: |
||
110 | |||
111 | cli |
||
112 | cmp [hd1_status],0 |
||
113 | je reserve_ok1 |
||
114 | |||
115 | sti |
||
116 | call change_task |
||
117 | jmp reserve_hd1 |
||
118 | |||
119 | reserve_ok1: |
||
120 | |||
121 | push eax |
||
122 | mov eax,[0x3000] |
||
123 | shl eax,5 |
||
124 | mov eax,[eax+0x3000+4] |
||
125 | mov [hd1_status],eax |
||
126 | pop eax |
||
127 | sti |
||
128 | ret |
||
129 | |||
130 | |||
131 | clear_hd_cache: |
||
132 | |||
133 | push eax ecx edi |
||
134 | mov edi,0x600000 |
||
135 | mov ecx,16384 |
||
136 | xor eax,eax |
||
137 | cld |
||
138 | rep stosd ; clear hd cache with 0 |
||
139 | mov [cache_search_start],eax |
||
140 | mov [fat_in_cache],-1 |
||
141 | mov [fat_change],0 |
||
142 | pop edi ecx eax |
||
143 | ret |
||
144 | |||
145 | problem_partition db 0 ; used for partitions search |
||
146 | |||
65 | mario79 | 147 | include 'part_set.inc' |
1 | ha | 148 | |
149 | set_FAT: |
||
150 | ;-------------------------------- |
||
151 | ; input : EAX = cluster |
||
152 | ; EDX = value to save |
||
153 | ; output : EDX = old value |
||
154 | ;-------------------------------- |
||
155 | push eax ebx esi |
||
156 | |||
157 | cmp eax,2 |
||
158 | jb sfc_error |
||
159 | cmp eax,[LAST_CLUSTER] |
||
160 | ja sfc_error |
||
161 | cmp [fat_type],16 |
||
162 | je sfc_1 |
||
163 | add eax,eax |
||
164 | sfc_1: |
||
165 | add eax,eax |
||
166 | mov esi,511 |
||
167 | and esi,eax ; esi = position in fat sector |
||
168 | shr eax,9 ; eax = fat sector |
||
169 | add eax,[FAT_START] |
||
170 | mov ebx,fat_cache |
||
171 | |||
172 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
||
173 | je sfc_in_cache ; yes |
||
174 | |||
175 | cmp [fat_change],0 ; is fat changed? |
||
176 | je sfc_no_change ; no |
||
177 | call write_fat_sector ; yes. write it into disk |
||
74 | mario79 | 178 | cmp [hd_error],0 |
179 | jne sfc_error |
||
1 | ha | 180 | |
181 | sfc_no_change: |
||
182 | mov [fat_in_cache],eax ; save fat sector |
||
183 | call hd_read |
||
74 | mario79 | 184 | cmp [hd_error],0 |
185 | jne sfc_error |
||
186 | |||
1 | ha | 187 | |
188 | sfc_in_cache: |
||
189 | cmp [fat_type],16 |
||
190 | jne sfc_test32 |
||
191 | |||
192 | cmp [f_del],1 ; overwrite previous value? |
||
193 | je sfc_set16 ; yes |
||
194 | cmp word [ebx+esi],0 ; is cluster free? |
||
195 | je sfc_set16 ; yes |
||
196 | mov dword [8*0x100000],0xffffff |
||
197 | mov edx,[ebx+esi] ; get old value |
||
198 | jmp sfc_nonzero |
||
199 | |||
200 | sfc_set16: |
||
201 | xchg [ebx+esi],dx ; save new value and get old value |
||
202 | jmp sfc_write |
||
203 | |||
204 | sfc_test32: |
||
205 | mov eax,[fatMASK] |
||
206 | cmp [f_del],1 ; overwrite previous value? |
||
207 | je sfc_set32 ; yes |
||
208 | test eax,[ebx+esi] ; is cluster free? |
||
209 | je sfc_set32 ; yes |
||
210 | mov dword [8*0x100000],0xffffff |
||
211 | mov edx,[ebx+esi] ; get old value |
||
212 | jmp sfc_nonzero |
||
213 | |||
214 | sfc_set32: |
||
215 | and edx,eax |
||
216 | xor eax,-1 ; mask for high bits |
||
217 | and eax,[ebx+esi] ; get high 4 bits |
||
218 | or eax,edx |
||
219 | mov edx,[ebx+esi] ; get old value |
||
220 | mov [ebx+esi],eax ; save new value |
||
221 | |||
222 | sfc_write: |
||
223 | mov [fat_change],1 ; fat has changed |
||
224 | |||
225 | sfc_nonzero: |
||
226 | and edx,[fatMASK] |
||
227 | |||
228 | sfc_error: |
||
229 | pop esi ebx eax |
||
230 | ret |
||
231 | |||
232 | |||
233 | get_FAT: |
||
234 | ;-------------------------------- |
||
235 | ; input : EAX = cluster |
||
236 | ; output : EAX = next cluster |
||
237 | ;-------------------------------- |
||
238 | push ebx esi |
||
239 | |||
240 | cmp [fat_type],16 |
||
241 | je gfc_1 |
||
242 | add eax,eax |
||
243 | gfc_1: |
||
244 | add eax,eax |
||
245 | mov esi,511 |
||
246 | and esi,eax ; esi = position in fat sector |
||
247 | shr eax,9 ; eax = fat sector |
||
248 | add eax,[FAT_START] |
||
249 | mov ebx,fat_cache |
||
250 | |||
251 | cmp eax,[fat_in_cache] ; is fat sector already in memory? |
||
252 | je gfc_in_cache |
||
253 | |||
254 | cmp [fat_change],0 ; is fat changed? |
||
255 | je gfc_no_change ; no |
||
256 | call write_fat_sector ; yes. write it into disk |
||
74 | mario79 | 257 | cmp [hd_error],0 |
258 | jne hd_error_01 |
||
1 | ha | 259 | |
260 | gfc_no_change: |
||
261 | mov [fat_in_cache],eax |
||
262 | call hd_read |
||
74 | mario79 | 263 | cmp [hd_error],0 |
264 | jne hd_error_01 |
||
1 | ha | 265 | |
266 | gfc_in_cache: |
||
267 | mov eax,[ebx+esi] |
||
268 | and eax,[fatMASK] |
||
74 | mario79 | 269 | hd_error_01: |
1 | ha | 270 | pop esi ebx |
271 | ret |
||
272 | |||
273 | |||
274 | get_free_FAT: |
||
275 | ;----------------------------------------------------------- |
||
276 | ; input : EAX = # cluster for start the searching |
||
277 | ; output : if CARRY=0 EAX = # first cluster found free |
||
278 | ; if CARRY=1 disk full |
||
279 | ; Note : for more speed need to use fat_cache directly |
||
280 | ;----------------------------------------------------------- |
||
281 | push ecx |
||
282 | mov ecx,[LAST_CLUSTER] ; counter for full disk |
||
283 | sub ecx,2 |
||
284 | |||
285 | gff_test: |
||
286 | cmp eax,[LAST_CLUSTER] ; if above last cluster start at cluster 2 |
||
287 | jbe gff_in_range |
||
288 | mov eax,2 |
||
289 | |||
290 | gff_in_range: |
||
291 | push eax |
||
292 | call get_FAT ; get cluster state |
||
74 | mario79 | 293 | cmp [hd_error],0 |
294 | jne gff_not_found_1 |
||
295 | |||
1 | ha | 296 | test eax,eax ; is it free? |
297 | pop eax |
||
298 | je gff_found ; yes |
||
299 | inc eax ; next cluster |
||
300 | dec ecx ; is all checked? |
||
301 | jns gff_test ; no |
||
302 | |||
74 | mario79 | 303 | gff_not_found_1: |
304 | add esp,4 |
||
1 | ha | 305 | gff_not_found: |
306 | pop ecx ; yes. disk is full |
||
307 | stc |
||
308 | ret |
||
309 | |||
310 | gff_found: |
||
311 | pop ecx |
||
312 | clc |
||
313 | ret |
||
314 | |||
315 | |||
316 | write_fat_sector: |
||
317 | ;----------------------------------------------------------- |
||
318 | ; write changed fat to disk |
||
319 | ;----------------------------------------------------------- |
||
320 | push eax ebx ecx |
||
321 | |||
322 | mov [fat_change],0 |
||
323 | mov eax,[fat_in_cache] |
||
324 | cmp eax,-1 |
||
325 | jz write_fat_not_used |
||
326 | mov ebx,fat_cache |
||
327 | mov ecx,[NUMBER_OF_FATS] |
||
328 | |||
329 | write_next_fat: |
||
330 | call hd_write |
||
74 | mario79 | 331 | cmp [hd_error],0 |
332 | jne write_fat_not_used |
||
333 | |||
1 | ha | 334 | add eax,[SECTORS_PER_FAT] |
335 | dec ecx |
||
336 | jnz write_next_fat |
||
337 | |||
338 | write_fat_not_used: |
||
339 | pop ecx ebx eax |
||
340 | ret |
||
341 | |||
342 | |||
343 | analyze_directory: |
||
344 | ;----------------------------------------------------------- |
||
345 | ; input : EAX = first cluster of the directory |
||
346 | ; EBX = pointer to filename |
||
347 | ; output : IF CARRY=0 EAX = sector where th file is found |
||
348 | ; EBX = pointer in buffer |
||
349 | ; [buffer .. buffer+511] |
||
350 | ; ECX,EDX,ESI,EDI not changed |
||
351 | ; IF CARRY=1 filename not found |
||
352 | ; Note : if cluster=0 it's changed to read rootdir |
||
353 | ; save 2 previous directory sectors in longname_sec |
||
354 | ;----------------------------------------------------------- |
||
355 | push ecx edx esi edi ebx ; ebx = [esp+0] |
||
356 | mov [longname_sec1],0 |
||
357 | mov [longname_sec2],0 |
||
358 | |||
359 | adr_new_cluster: |
||
360 | mov [cluster_tmp],eax |
||
361 | mov [fat16_root],0 |
||
362 | cmp eax,[LAST_CLUSTER] |
||
363 | ja adr_not_found ; too big cluster number, something is wrong |
||
364 | cmp eax,2 |
||
365 | jnb adr_data_cluster |
||
366 | |||
367 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
368 | cmp [fat_type],16 |
||
369 | jne adr_data_cluster |
||
370 | mov eax,[ROOT_START] |
||
371 | mov edx,[ROOT_SECTORS] |
||
372 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
373 | jmp adr_new_sector |
||
374 | |||
375 | adr_data_cluster: |
||
376 | sub eax,2 |
||
377 | mov edx,[SECTORS_PER_CLUSTER] |
||
378 | imul eax,edx |
||
379 | add eax,[DATA_START] |
||
380 | |||
381 | adr_new_sector: |
||
382 | mov ebx,buffer |
||
383 | call hd_read |
||
74 | mario79 | 384 | cmp [hd_error],0 |
385 | jne adr_not_found |
||
386 | |||
1 | ha | 387 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
388 | |||
389 | adr_analyze: |
||
390 | mov edi,[ebx+11] ; file attribute |
||
391 | and edi,0xf |
||
392 | cmp edi,0xf |
||
393 | je adr_long_filename |
||
394 | test edi,0x8 ; skip over volume label |
||
395 | jne adr_long_filename ; Note: label can be same name as file/dir |
||
396 | |||
397 | mov esi,[esp+0] ; filename need to be uppercase |
||
398 | mov edi,ebx |
||
399 | push ecx |
||
400 | mov ecx,11 |
||
401 | cld |
||
402 | rep cmpsb ; compare 8+3 filename |
||
403 | pop ecx |
||
404 | je adr_found |
||
405 | |||
406 | adr_long_filename: |
||
407 | add ebx,32 ; position of next dir entry |
||
408 | dec ecx |
||
409 | jnz adr_analyze |
||
410 | |||
411 | mov ecx,[longname_sec1] ; save 2 previous directory sectors |
||
412 | mov [longname_sec1],eax ; for delete long filename |
||
413 | mov [longname_sec2],ecx |
||
414 | inc eax ; next sector |
||
415 | dec edx |
||
416 | jne adr_new_sector |
||
417 | cmp [fat16_root],1 ; end of fat16 rootdir |
||
418 | je adr_not_found |
||
419 | |||
420 | adr_next_cluster: |
||
421 | mov eax,[cluster_tmp] |
||
422 | call get_FAT ; get next cluster |
||
74 | mario79 | 423 | cmp [hd_error],0 |
424 | jne adr_not_found |
||
425 | |||
1 | ha | 426 | cmp eax,2 ; incorrect fat chain? |
427 | jb adr_not_found ; yes |
||
428 | cmp eax,[fatRESERVED] ; is it end of directory? |
||
429 | jb adr_new_cluster ; no. analyse it |
||
430 | |||
431 | adr_not_found: |
||
432 | pop edi edi esi edx ecx ; first edi will remove ebx |
||
433 | stc ; file not found |
||
434 | ret |
||
435 | |||
436 | adr_found: |
||
437 | pop edi edi esi edx ecx ; first edi will remove ebx |
||
438 | clc ; file found |
||
439 | ret |
||
440 | |||
441 | |||
442 | analyze_directory_to_write: |
||
443 | ;----------------------------------------------------------- |
||
444 | ; input : EAX = first cluster of the directory |
||
445 | ; output : IF CARRY=0 EAX = sector where the empty pos is found |
||
446 | ; EBX = pointer in buffer |
||
447 | ; [buffer .. buffer+511] |
||
448 | ; ECX,EDX,ESI,EDI not changed |
||
449 | ; IF CARRY=1 disk full or fat corrupted |
||
450 | ; Note : if cluster=0 it's changed to read rootdir |
||
451 | ;----------------------------------------------------------- |
||
452 | push ecx edx edi |
||
453 | |||
454 | adw_new_cluster: |
||
455 | mov [cluster_tmp],eax |
||
456 | mov [fat16_root],0 |
||
457 | cmp eax,[LAST_CLUSTER] |
||
458 | ja adw_not_found ; too big cluster number, something is wrong |
||
459 | cmp eax,2 |
||
460 | jnb adw_data_cluster |
||
461 | |||
462 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
463 | cmp [fat_type],16 |
||
464 | jne adw_data_cluster |
||
465 | mov eax,[ROOT_START] |
||
466 | mov edx,[ROOT_SECTORS] |
||
467 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
468 | jmp adw_new_sector |
||
469 | |||
470 | adw_data_cluster: |
||
471 | sub eax,2 |
||
472 | mov edx,[SECTORS_PER_CLUSTER] |
||
473 | imul eax,edx |
||
474 | add eax,[DATA_START] |
||
475 | |||
476 | adw_new_sector: |
||
477 | mov ebx,buffer |
||
478 | call hd_read |
||
74 | mario79 | 479 | cmp [hd_error],0 |
480 | jne adw_not_found |
||
481 | |||
1 | ha | 482 | mov ecx,512/32 ; count of dir entrys per sector = 16 |
483 | |||
484 | adw_analyze: |
||
485 | cmp byte [ebx],0x00 ; is free entry? |
||
486 | je adw_found ; yes |
||
487 | cmp byte [ebx],0xe5 ; is deleted entry? |
||
488 | je adw_found ; yes |
||
489 | add ebx,32 ; position of next dir entry |
||
490 | dec ecx |
||
491 | jnz adw_analyze |
||
492 | |||
493 | inc eax ; next sector |
||
494 | dec edx |
||
495 | jne adw_new_sector |
||
496 | cmp [fat16_root],1 ; end of fat16 rootdir |
||
497 | je adw_not_found |
||
498 | |||
499 | mov eax,[cluster_tmp] |
||
500 | call get_FAT ; get next cluster |
||
74 | mario79 | 501 | cmp [hd_error],0 |
502 | jne adw_not_found |
||
503 | |||
1 | ha | 504 | cmp eax,2 ; incorrect fat chain? |
505 | jb adw_not_found ; yes |
||
506 | cmp eax,[fatRESERVED] ; is it end of directory? |
||
507 | jb adw_new_cluster ; no. analyse it |
||
508 | |||
509 | mov eax,2 ; this block of code add a new cluster |
||
510 | call get_free_FAT ; for the directory because the directory |
||
511 | jc adw_not_found ; is full |
||
512 | |||
513 | mov edx,[fatEND] ; new end for directory |
||
514 | call set_FAT |
||
74 | mario79 | 515 | cmp [hd_error],0 |
516 | jne adw_not_found |
||
1 | ha | 517 | |
518 | push eax ; save new cluster |
||
519 | mov edx,eax |
||
520 | mov eax,[cluster_tmp] ; change last cluster to point new cluster |
||
521 | mov [f_del],1 |
||
522 | call set_FAT |
||
74 | mario79 | 523 | cmp [hd_error],0 |
524 | jne adw_not_found_1 |
||
525 | |||
1 | ha | 526 | mov [f_del],0 |
527 | |||
528 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
529 | call add_disk_free_space |
||
74 | mario79 | 530 | cmp [hd_error],0 |
531 | jne adw_not_found_1 |
||
1 | ha | 532 | |
533 | mov ecx,512/4 |
||
534 | xor eax,eax |
||
535 | mov edi,buffer |
||
536 | cld |
||
537 | rep stosd ; clear new directory cluster |
||
538 | pop eax |
||
539 | |||
540 | sub eax,2 |
||
541 | mov ecx,[SECTORS_PER_CLUSTER] |
||
542 | imul eax,ecx |
||
543 | add eax,[DATA_START] |
||
544 | mov ebx,buffer |
||
545 | push eax ; save sector number |
||
546 | |||
547 | adw_set_empty_directory: |
||
548 | call hd_write |
||
74 | mario79 | 549 | cmp [hd_error],0 |
550 | jne adw_not_found_1 |
||
551 | |||
1 | ha | 552 | inc eax ; next sector |
553 | dec ecx |
||
554 | jnz adw_set_empty_directory |
||
555 | |||
556 | pop eax |
||
557 | |||
558 | adw_found: |
||
559 | pop edi edx ecx |
||
560 | clc ; free space found |
||
561 | ret |
||
74 | mario79 | 562 | adw_not_found_1: |
563 | add esp,4 |
||
1 | ha | 564 | adw_not_found: |
565 | pop edi edx ecx |
||
566 | stc ; free space not found |
||
567 | ret |
||
568 | |||
569 | |||
570 | get_data_cluster: |
||
571 | ;----------------------------------------------------------- |
||
572 | ; input : EAX = cluster |
||
573 | ; EBX = pointer to buffer |
||
574 | ; EDX = # blocks to read in buffer |
||
575 | ; ESI = # blocks to skip over |
||
576 | ; output : if CARRY=0 ok EBX/EDX/ESI updated |
||
577 | ; if CARRY=1 cluster out of range |
||
578 | ; Note : if cluster=0 it's changed to read rootdir |
||
579 | ;----------------------------------------------------------- |
||
580 | push eax ecx |
||
581 | |||
582 | mov [fat16_root],0 |
||
583 | cmp eax,[LAST_CLUSTER] |
||
584 | ja gdc_error ; too big cluster number, something is wrong |
||
585 | cmp eax,2 |
||
586 | jnb gdc_cluster |
||
587 | |||
588 | mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir |
||
589 | cmp [fat_type],16 |
||
590 | jne gdc_cluster |
||
591 | mov eax,[ROOT_START] |
||
592 | mov ecx,[ROOT_SECTORS] ; Note: not cluster size |
||
593 | mov [fat16_root],1 ; flag for fat16 rootdir |
||
594 | jmp gdc_read |
||
595 | |||
596 | gdc_cluster: |
||
597 | sub eax,2 |
||
598 | mov ecx,[SECTORS_PER_CLUSTER] |
||
599 | imul eax,ecx |
||
600 | add eax,[DATA_START] |
||
601 | |||
602 | gdc_read: |
||
603 | test esi,esi ; first wanted block |
||
604 | je gdcl1 ; yes, skip count is 0 |
||
605 | dec esi |
||
606 | jmp gdcl2 |
||
607 | |||
608 | gdcl1: |
||
609 | call hd_read |
||
74 | mario79 | 610 | cmp [hd_error],0 |
611 | jne gdc_error |
||
612 | |||
1 | ha | 613 | add ebx,512 ; update pointer |
614 | dec edx |
||
615 | |||
616 | gdcl2: |
||
617 | test edx,edx ; is all read? |
||
618 | je out_of_read |
||
619 | |||
620 | inc eax ; next sector |
||
621 | dec ecx |
||
622 | jnz gdc_read |
||
623 | |||
624 | out_of_read: |
||
625 | pop ecx eax |
||
626 | clc |
||
627 | ret |
||
628 | |||
629 | gdc_error: |
||
630 | pop ecx eax |
||
631 | stc |
||
632 | ret |
||
633 | |||
634 | |||
635 | set_data_cluster: |
||
636 | ;----------------------------------------------------------- |
||
637 | ; input : EAX = cluster |
||
638 | ; EBX = pointer to buffer |
||
639 | ; output : if CARRY=0 ok |
||
640 | ; if CARRY=1 cluster out of range |
||
641 | ;----------------------------------------------------------- |
||
642 | push eax ebx edx |
||
643 | |||
644 | cmp eax,[LAST_CLUSTER] |
||
645 | ja sdc_error ; too big cluster number, something is wrong |
||
646 | sub eax,2 |
||
647 | jb sdc_error ; don't allow rootdir write |
||
648 | |||
649 | mov edx,[SECTORS_PER_CLUSTER] |
||
650 | imul eax,edx |
||
651 | add eax,[DATA_START] |
||
652 | |||
653 | sdc_write: |
||
654 | call hd_write |
||
74 | mario79 | 655 | cmp [hd_error],0 |
656 | jne sdc_error |
||
657 | |||
1 | ha | 658 | add ebx,512 ; update pointer |
659 | inc eax |
||
660 | dec edx |
||
661 | jnz sdc_write |
||
662 | pop edx ebx eax |
||
663 | clc |
||
664 | ret |
||
665 | |||
666 | sdc_error: |
||
667 | pop edx ebx eax |
||
668 | stc |
||
669 | ret |
||
670 | |||
671 | |||
672 | get_cluster_of_a_path: |
||
673 | ;--------------------------------------------------------- |
||
674 | ; input : EBX = pointer to a path string |
||
675 | ; (example: the path "/files/data/document" become |
||
676 | ; "files......data.......document...0" |
||
677 | ; '.' = space char |
||
678 | ; '0' = char(0) (ASCII=0) !!! ) |
||
679 | ; output : if (CARRY=1) -> ERROR in the PATH |
||
680 | ; if (CARRY=0) -> EAX=cluster |
||
681 | ;--------------------------------------------------------- |
||
682 | push ebx edx |
||
683 | |||
684 | mov eax,[ROOT_CLUSTER] |
||
685 | mov edx,ebx |
||
686 | |||
687 | search_end_of_path: |
||
688 | cmp byte [edx],0 |
||
689 | je found_end_of_path |
||
690 | |||
691 | inc edx ; '/' |
||
692 | mov ebx,edx |
||
693 | call analyze_directory |
||
694 | jc directory_not_found |
||
695 | |||
696 | mov eax,[ebx+20-2] ; read the HIGH 16bit cluster field |
||
697 | mov ax,[ebx+26] ; read the LOW 16bit cluster field |
||
698 | and eax,[fatMASK] |
||
699 | add edx,11 ; 8+3 (name+extension) |
||
700 | jmp search_end_of_path |
||
701 | |||
702 | found_end_of_path: |
||
703 | pop edx ebx |
||
704 | clc ; no errors |
||
705 | ret |
||
706 | |||
707 | directory_not_found: |
||
708 | pop edx ebx |
||
709 | stc ; errors occour |
||
710 | ret |
||
711 | |||
712 | |||
713 | bcd2bin: |
||
714 | ;---------------------------------- |
||
715 | ; input : AL=BCD number (eg. 0x11) |
||
716 | ; output : AH=0 |
||
717 | ; AL=decimal number (eg. 11) |
||
718 | ;---------------------------------- |
||
719 | xor ah,ah |
||
720 | shl ax,4 |
||
721 | shr al,4 |
||
722 | aad |
||
723 | ret |
||
724 | |||
725 | |||
726 | get_date_for_file: |
||
727 | ;----------------------------------------------------- |
||
728 | ; Get date from CMOS and pack day,month,year in AX |
||
729 | ; DATE bits 0..4 : day of month 0..31 |
||
730 | ; 5..8 : month of year 1..12 |
||
731 | ; 9..15 : count of years from 1980 |
||
732 | ;----------------------------------------------------- |
||
733 | mov al,0x7 ;day |
||
734 | out 0x70,al |
||
735 | in al,0x71 |
||
736 | call bcd2bin |
||
737 | ror eax,5 |
||
738 | |||
739 | mov al,0x8 ;month |
||
740 | out 0x70,al |
||
741 | in al,0x71 |
||
742 | call bcd2bin |
||
743 | ror eax,4 |
||
744 | |||
745 | mov al,0x9 ;year |
||
746 | out 0x70,al |
||
747 | in al,0x71 |
||
748 | call bcd2bin |
||
749 | add ax,20 ;because CMOS return only the two last |
||
750 | ;digit (eg. 2000 -> 00 , 2001 -> 01) and we |
||
751 | rol eax,9 ;need the difference with 1980 (eg. 2001-1980) |
||
752 | ret |
||
753 | |||
754 | |||
755 | get_time_for_file: |
||
756 | ;----------------------------------------------------- |
||
757 | ; Get time from CMOS and pack hour,minute,second in AX |
||
758 | ; TIME bits 0..4 : second (the low bit is lost) |
||
759 | ; 5..10 : minute 0..59 |
||
760 | ; 11..15 : hour 0..23 |
||
761 | ;----------------------------------------------------- |
||
762 | mov al,0x0 ;second |
||
763 | out 0x70,al |
||
764 | in al,0x71 |
||
765 | call bcd2bin |
||
766 | ror eax,6 |
||
767 | |||
768 | mov al,0x2 ;minute |
||
769 | out 0x70,al |
||
770 | in al,0x71 |
||
771 | call bcd2bin |
||
772 | ror eax,6 |
||
773 | |||
774 | mov al,0x4 ;hour |
||
775 | out 0x70,al |
||
776 | in al,0x71 |
||
777 | call bcd2bin |
||
778 | rol eax,11 |
||
779 | ret |
||
780 | |||
781 | |||
782 | set_current_time_for_entry: |
||
783 | ;----------------------------------------------------- |
||
784 | ; Set current time/date for file entry |
||
785 | ; input : ebx = file entry pointer |
||
786 | ;----------------------------------------------------- |
||
787 | push eax |
||
788 | call get_time_for_file ; update files date/time |
||
789 | mov [ebx+22],ax |
||
790 | call get_date_for_file |
||
791 | mov [ebx+24],ax |
||
792 | pop eax |
||
793 | ret |
||
794 | |||
795 | |||
796 | makedir: |
||
797 | ;----------------------------------------------------- |
||
798 | ; input : eax = directory name |
||
799 | ; edx = path |
||
800 | ; output : eax = 0 - ok |
||
801 | ; 3 - unknown FS |
||
802 | ; 5 - file not found |
||
803 | ; 8 - disk full |
||
804 | ; 10 - access denied |
||
805 | ; Note : can only make one directory at time |
||
806 | ;----------------------------------------------------- |
||
807 | cmp [fat_type],0 |
||
808 | jnz make_dir_fat_ok |
||
809 | mov eax,ERROR_UNKNOWN_FS |
||
810 | ret |
||
811 | |||
812 | make_dir_fat_ok: |
||
813 | ; call reserve_hd1 |
||
814 | |||
815 | pushad |
||
816 | |||
817 | mov ebx,edx |
||
818 | call get_cluster_of_a_path |
||
819 | jnc make_dir_found_path |
||
74 | mario79 | 820 | cmp [hd_error],0 |
821 | jne make_dir_error_1 |
||
1 | ha | 822 | |
823 | make_dir_path_not_found: |
||
824 | popad |
||
825 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 826 | cmp [hd_error],0 |
827 | jne make_dir_error_2 |
||
828 | |||
1 | ha | 829 | mov [hd1_status],0 |
830 | mov eax,ERROR_FILE_NOT_FOUND |
||
831 | ret |
||
832 | |||
833 | make_dir_disk_full: |
||
74 | mario79 | 834 | cmp [hd_error],0 |
835 | jne make_dir_error_1 |
||
1 | ha | 836 | popad |
837 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 838 | cmp [hd_error],0 |
839 | jne make_dir_error_2 |
||
840 | |||
1 | ha | 841 | mov [hd1_status],0 |
842 | mov eax,ERROR_DISK_FULL |
||
843 | ret |
||
844 | |||
845 | make_dir_already_exist: |
||
74 | mario79 | 846 | cmp [hd_error],0 |
847 | jne make_dir_error_1 |
||
1 | ha | 848 | mov eax,[cluster] ; directory cluster |
849 | xor edx,edx ; free |
||
850 | mov [f_del],1 |
||
851 | call set_FAT |
||
74 | mario79 | 852 | cmp [hd_error],0 |
853 | jne make_dir_error_1 |
||
854 | |||
1 | ha | 855 | mov [f_del],0 |
856 | |||
857 | popad |
||
858 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 859 | make_dir_error_2: |
1 | ha | 860 | mov [hd1_status],0 |
861 | mov eax,ERROR_ACCESS_DENIED |
||
862 | ret |
||
863 | |||
74 | mario79 | 864 | make_dir_error_1: |
865 | popad |
||
866 | jmp make_dir_error_2 |
||
867 | |||
868 | make_dir_error_3: |
||
869 | add esp,4 |
||
870 | jmp make_dir_error_1 |
||
871 | |||
1 | ha | 872 | make_dir_found_path: |
873 | cmp eax,[ROOT_CLUSTER] |
||
874 | jnz make_dir_not_root |
||
875 | xor eax,eax |
||
876 | |||
877 | make_dir_not_root: |
||
878 | mov ecx,eax ; directorys start cluster |
||
879 | mov word [NewDirEntry2+26],cx ; 16 bits low of cluster |
||
880 | shr ecx,16 |
||
881 | mov word [NewDirEntry2+20],cx ; 16 bits high of cluster (=0 fat16) |
||
882 | |||
883 | push eax ; save parent directory cluster |
||
884 | mov eax,2 |
||
885 | call get_free_FAT |
||
886 | mov [cluster],eax ; first free cluster |
||
887 | pop eax |
||
888 | jc make_dir_disk_full |
||
889 | |||
890 | push eax |
||
891 | mov eax,[cluster] ; directory cluster |
||
892 | mov edx,[fatEND] ; end for directory |
||
893 | call set_FAT |
||
74 | mario79 | 894 | cmp [hd_error],0 |
895 | jne make_dir_error_3 |
||
1 | ha | 896 | pop eax |
897 | |||
898 | mov ebx,PUSHAD_EAX ; dir name |
||
899 | push eax |
||
900 | call analyze_directory ; check if directory already exist |
||
74 | mario79 | 901 | cmp [hd_error],0 |
902 | jne make_dir_error_1 |
||
903 | |||
1 | ha | 904 | pop eax |
905 | jnc make_dir_already_exist ; need to free allocated cluster! |
||
906 | |||
907 | call analyze_directory_to_write |
||
908 | jc make_dir_already_exist ; need to free allocated cluster! |
||
909 | |||
910 | mov esi,PUSHAD_EAX ; dir name |
||
911 | mov edi,ebx ; pointer in buffer |
||
912 | mov ecx,11 |
||
913 | cld |
||
914 | rep movsb |
||
915 | |||
916 | mov dword [ebx+28],0 ; dir size is always 0 |
||
917 | mov ecx,[cluster] |
||
918 | mov [ebx+26],cx ; 16 bits low of cluster |
||
919 | mov word [NewDirEntry1+26],cx |
||
920 | shr ecx,16 |
||
921 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
922 | mov word [NewDirEntry1+20],cx |
||
923 | mov byte [ebx+11],0x10 ; attribute = directory |
||
924 | |||
925 | call set_current_time_for_entry |
||
926 | mov ecx,[ebx+22] |
||
927 | mov dword [NewDirEntry1+22],ecx |
||
928 | mov dword [NewDirEntry2+22],ecx |
||
929 | |||
930 | mov ebx,buffer ; save the directory name,length,cluster |
||
931 | call hd_write |
||
74 | mario79 | 932 | cmp [hd_error],0 |
933 | jne make_dir_error_1 |
||
1 | ha | 934 | |
935 | mov ecx,512/4 |
||
936 | xor eax,eax |
||
937 | mov edi,buffer |
||
938 | cld |
||
939 | rep stosd ; clear new directory cluster |
||
940 | |||
941 | mov eax,[cluster] ; new directory cluster |
||
942 | sub eax,2 |
||
943 | mov edx,[SECTORS_PER_CLUSTER] |
||
944 | imul eax,edx |
||
945 | add eax,[DATA_START] |
||
946 | mov ebx,buffer |
||
947 | add eax,edx ; start from last sector |
||
948 | |||
949 | dir_set_empty_directory: |
||
950 | dec eax ; next sector |
||
951 | cmp edx,1 ; is first directory sector? |
||
952 | jnz not_first_sector ; no. write empty sector |
||
953 | mov esi,NewDirEntry1 |
||
954 | mov edi,buffer |
||
955 | mov ecx,64/4 |
||
956 | cld |
||
957 | rep movsd ; copy 2 first directory entrys "." and ".." |
||
958 | |||
959 | not_first_sector: |
||
960 | call hd_write |
||
74 | mario79 | 961 | cmp [hd_error],0 |
962 | jne make_dir_error_1 |
||
963 | |||
1 | ha | 964 | dec edx |
965 | jnz dir_set_empty_directory |
||
966 | |||
967 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
968 | call add_disk_free_space |
||
74 | mario79 | 969 | cmp [hd_error],0 |
970 | jne make_dir_error_1 |
||
1 | ha | 971 | |
972 | popad |
||
973 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 974 | cmp [hd_error],0 |
975 | jne make_dir_error_2 |
||
1 | ha | 976 | mov [hd1_status],0 |
977 | xor eax,eax |
||
978 | ret |
||
979 | |||
980 | |||
981 | removedir: |
||
982 | ;----------------------------------------------------- |
||
983 | ; input : eax = file/directory name |
||
984 | ; edx = path |
||
985 | ; output : eax = 0 - ok |
||
986 | ; 3 - unknown FS |
||
987 | ; 5 - file not found |
||
988 | ; 10 - access denied |
||
989 | ;----------------------------------------------------- |
||
990 | cmp [fat_type],0 |
||
991 | jnz remove_dir_fat_ok |
||
992 | mov eax,ERROR_UNKNOWN_FS |
||
993 | ret |
||
994 | |||
995 | remove_dir_fat_ok: |
||
996 | ; call reserve_hd1 |
||
997 | |||
998 | push edi |
||
999 | mov edi,1 ; allow directory remove |
||
1000 | call file_delete |
||
74 | mario79 | 1001 | cmp [hd_error],0 |
1002 | jne @f |
||
1003 | |||
1 | ha | 1004 | pop edi |
1005 | |||
1006 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 1007 | @@: |
1 | ha | 1008 | mov [hd1_status],0 |
1009 | ret |
||
74 | mario79 | 1010 | |
1 | ha | 1011 | |
1012 | add_disk_free_space: |
||
1013 | ;----------------------------------------------------- |
||
1014 | ; input : ecx = cluster count |
||
1015 | ; Note : negative = remove clusters from free space |
||
1016 | ; positive = add clusters to free space |
||
1017 | ;----------------------------------------------------- |
||
1018 | test ecx,ecx ; no change |
||
1019 | je add_dfs_no |
||
1020 | cmp [fat_type],32 ; free disk space only used by fat32 |
||
1021 | jne add_dfs_no |
||
1022 | |||
1023 | push eax ebx |
||
1024 | mov eax,[ADR_FSINFO] |
||
1025 | mov ebx,buffer |
||
1026 | call hd_read |
||
74 | mario79 | 1027 | cmp [hd_error],0 |
1028 | jne add_not_fs |
||
1029 | |||
1 | ha | 1030 | cmp dword [ebx+0x1fc],0xaa550000 ; check sector id |
1031 | jne add_not_fs |
||
1032 | |||
1033 | add [ebx+0x1e8],ecx |
||
1034 | call hd_write |
||
74 | mario79 | 1035 | cmp [hd_error],0 |
1036 | jne add_not_fs |
||
1 | ha | 1037 | |
1038 | add_not_fs: |
||
1039 | pop ebx eax |
||
1040 | |||
1041 | add_dfs_no: |
||
1042 | ret |
||
1043 | |||
1044 | |||
1045 | file_append: |
||
1046 | ;----------------------------------------------------- |
||
1047 | ; input : eax = file name |
||
1048 | ; edx = path |
||
1049 | ; ecx = pointer to buffer |
||
1050 | ; ebx = bytes to write (0 = truncate file) |
||
1051 | ; esi = start position (-1 = end of file) |
||
1052 | ; output : eax = 0 - ok |
||
1053 | ; 3 - unknown FS |
||
1054 | ; 5 - file not found |
||
1055 | ; 6 - end of file |
||
1056 | ; 8 - disk full |
||
1057 | ; 9 - fat table corrupted |
||
1058 | ; 10 - access denied |
||
1059 | ; ebx = bytes written |
||
1060 | ;----------------------------------------------------- |
||
1061 | cmp [fat_type],0 |
||
1062 | jnz append_fat_ok |
||
1063 | mov eax,ERROR_UNKNOWN_FS |
||
1064 | ret |
||
1065 | |||
1066 | append_fat_ok: |
||
1067 | ; call reserve_hd1 |
||
1068 | |||
1069 | pushad |
||
1070 | |||
1071 | mov ebx,edx |
||
1072 | call get_cluster_of_a_path |
||
1073 | jc append_not_found |
||
1074 | |||
1075 | mov ebx,PUSHAD_EAX ; file name |
||
1076 | call analyze_directory |
||
1077 | jc append_not_found |
||
1078 | |||
1079 | mov [sector_tmp],eax |
||
1080 | mov [entry_pos],ebx |
||
1081 | |||
1082 | test byte [ebx+11],0x10 ; is it directory? |
||
1083 | jnz append_access ; yes |
||
1084 | |||
1085 | mov ecx,[ebx+28] ; file size |
||
1086 | mov edi,PUSHAD_ESI ; write position |
||
1087 | cmp edi,-1 ; -1 = eof |
||
1088 | jnz append_inside_file |
||
1089 | mov edi,ecx ; file size |
||
1090 | |||
1091 | append_inside_file: |
||
1092 | cmp edi,ecx ; start above old file size? |
||
1093 | ja append_eof ; yes |
||
1094 | |||
1095 | mov [old_filesize],ecx |
||
1096 | mov [new_filepos],edi |
||
1097 | |||
1098 | mov ecx,PUSHAD_EBX ; bytes to write |
||
1099 | test ecx,ecx ; truncate? |
||
1100 | jz append_truncate ; yes |
||
1101 | |||
1102 | mov [bytes2write],ecx ; bytes to write |
||
1103 | mov esi,PUSHAD_ECX ; pointer to buffer |
||
1104 | mov eax,[ebx+20-2] ; FAT entry |
||
1105 | mov ax,[ebx+26] |
||
1106 | and eax,[fatMASK] |
||
1107 | jnz append_find_pos ; first cluster <> 0 |
||
1108 | |||
1109 | mov eax,2 |
||
1110 | call get_free_FAT |
||
1111 | jc append_disk_full |
||
1112 | mov ecx,eax ; set files first cluster |
||
1113 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1114 | shr ecx,16 |
||
1115 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1116 | mov edx,[fatEND] ; new end for cluster chain |
||
1117 | call set_FAT |
||
74 | mario79 | 1118 | cmp [hd_error],0 |
1119 | jne append_access |
||
1 | ha | 1120 | |
1121 | push eax ; save first cluster |
||
1122 | mov eax,[sector_tmp] |
||
1123 | mov ebx,buffer |
||
1124 | call hd_write ; write new file entry back to disk |
||
74 | mario79 | 1125 | cmp [hd_error],0 |
1126 | jne append_access_1 |
||
1127 | |||
1 | ha | 1128 | pop eax |
1129 | |||
1130 | append_remove_free: |
||
1131 | mov ecx,-1 ; remove 1 cluster from free disk space |
||
1132 | call add_disk_free_space ; Note: uses buffer |
||
74 | mario79 | 1133 | cmp [hd_error],0 |
1134 | jne append_access |
||
1 | ha | 1135 | |
1136 | append_found_cluster: |
||
1137 | mov [cluster],eax |
||
1138 | sub eax,2 |
||
1139 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1140 | imul eax,ecx |
||
1141 | add eax,[DATA_START] |
||
1142 | xor edi,edi |
||
1143 | |||
1144 | append_new_sector: |
||
74 | mario79 | 1145 | cmp [hd_error],0 |
1146 | jne append_access |
||
1 | ha | 1147 | push ecx |
1148 | mov ecx,[bytes2write] ; bytes left in buffer |
||
1149 | mov ebx,512 |
||
1150 | sub ebx,edi ; bytes left in sector |
||
1151 | cmp ecx,ebx |
||
1152 | jb append_bytes_ok |
||
1153 | mov ecx,ebx |
||
1154 | |||
1155 | append_bytes_ok: |
||
1156 | cmp ecx,512 ; overwrite full sector? |
||
1157 | jz append_full_sector ; yes |
||
1158 | mov ebx,buffer ; overwrite part of sector |
||
1159 | call hd_read ; read old sector |
||
74 | mario79 | 1160 | cmp [hd_error],0 |
1161 | jne append_access_1 |
||
1 | ha | 1162 | |
1163 | append_full_sector: |
||
1164 | sub [bytes2write],ecx |
||
1165 | add [new_filepos],ecx |
||
1166 | add edi,buffer |
||
1167 | cld |
||
1168 | rep movsb |
||
1169 | pop ecx |
||
1170 | |||
1171 | mov ebx,buffer |
||
1172 | call hd_write |
||
74 | mario79 | 1173 | cmp [hd_error],0 |
1174 | jne append_access |
||
1175 | |||
1 | ha | 1176 | cmp [bytes2write],0 ; is all done? |
1177 | jz append_done |
||
1178 | xor edi,edi |
||
1179 | inc eax |
||
1180 | dec ecx |
||
1181 | jnz append_new_sector |
||
1182 | |||
1183 | mov eax,[cluster] |
||
1184 | call get_FAT |
||
74 | mario79 | 1185 | cmp [hd_error],0 |
1186 | jne append_access |
||
1187 | |||
1 | ha | 1188 | cmp eax,2 |
1189 | jb append_fat |
||
1190 | cmp eax,[LAST_CLUSTER] |
||
1191 | jbe append_found_cluster |
||
1192 | |||
1193 | append_alloc_cluster: |
||
1194 | mov eax,2 ; ToDo: use temp array to keep track |
||
1195 | call get_free_FAT ; of last free cluster |
||
1196 | jc append_disk_full |
||
1197 | push eax ; save new cluster |
||
1198 | mov edx,[fatEND] ; new end for cluster chain |
||
1199 | call set_FAT |
||
74 | mario79 | 1200 | cmp [hd_error],0 |
1201 | jne append_access_1 |
||
1202 | |||
1 | ha | 1203 | mov edx,eax |
1204 | mov eax,[cluster] |
||
1205 | mov [f_del],1 |
||
1206 | call set_FAT ; update previous cluster |
||
74 | mario79 | 1207 | cmp [hd_error],0 |
1208 | jne append_access_1 |
||
1209 | |||
1 | ha | 1210 | mov [f_del],0 |
1211 | pop eax |
||
1212 | jmp append_remove_free |
||
1213 | |||
1214 | append_find_pos: |
||
1215 | call find_filepos |
||
1216 | mov [cluster],ebx |
||
1217 | jnc append_new_sector |
||
1218 | test edi,edi |
||
1219 | jz append_alloc_cluster |
||
1220 | |||
1221 | append_fat: |
||
1222 | mov eax,ERROR_FAT_TABLE |
||
1223 | jmp append_ret_code |
||
74 | mario79 | 1224 | |
1 | ha | 1225 | append_disk_full: |
74 | mario79 | 1226 | cmp [hd_error],0 |
1227 | jne append_access |
||
1 | ha | 1228 | mov eax,ERROR_DISK_FULL |
1229 | jmp append_ret_code |
||
1230 | |||
1231 | append_done: |
||
1232 | xor eax,eax |
||
1233 | |||
1234 | append_ret_code: |
||
1235 | mov PUSHAD_EAX,eax ; return code |
||
1236 | |||
1237 | mov eax,[sector_tmp] ; update directory entry |
||
1238 | mov ebx,buffer |
||
1239 | call hd_read |
||
74 | mario79 | 1240 | cmp [hd_error],0 |
1241 | jne append_access |
||
1242 | |||
1 | ha | 1243 | mov ebx,[entry_pos] |
1244 | mov ecx,[new_filepos] |
||
1245 | cmp ecx,[old_filesize] ; is file pos above old size? |
||
1246 | jbe append_size_ok ; no |
||
1247 | mov [ebx+28],ecx ; new file size |
||
1248 | |||
1249 | append_size_ok: |
||
1250 | call set_current_time_for_entry |
||
1251 | mov ebx,buffer |
||
1252 | call hd_write ; write new file entry back to disk |
||
74 | mario79 | 1253 | cmp [hd_error],0 |
1254 | jne append_access |
||
1 | ha | 1255 | |
1256 | sub ecx,PUSHAD_ESI ; start position |
||
1257 | mov PUSHAD_EBX,ecx ; bytes written |
||
1258 | popad |
||
1259 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 1260 | cmp [hd_error],0 |
1261 | jne append_access_2 |
||
1262 | |||
1 | ha | 1263 | mov [hd1_status],0 |
1264 | ret |
||
1265 | |||
1266 | append_eof: |
||
1267 | popad |
||
1268 | mov [hd1_status],0 |
||
1269 | xor ebx,ebx |
||
1270 | mov eax,ERROR_END_OF_FILE |
||
1271 | ret |
||
1272 | |||
1273 | append_not_found: |
||
74 | mario79 | 1274 | cmp [hd_error],0 |
1275 | jne append_access |
||
1 | ha | 1276 | popad |
1277 | mov [hd1_status],0 |
||
1278 | xor ebx,ebx |
||
1279 | mov eax,ERROR_FILE_NOT_FOUND |
||
74 | mario79 | 1280 | ret |
1281 | append_access_1: |
||
1282 | add esp,4 |
||
1 | ha | 1283 | append_access: |
1284 | popad |
||
74 | mario79 | 1285 | append_access_2: |
1 | ha | 1286 | mov [hd1_status],0 |
1287 | xor ebx,ebx |
||
1288 | mov eax,ERROR_ACCESS_DENIED |
||
1289 | ret |
||
1290 | |||
1291 | append_truncate: |
||
1292 | mov edx,[ebx+20-2] ; FAT entry |
||
1293 | mov dx,[ebx+26] |
||
1294 | and edx,[fatMASK] |
||
1295 | mov [ebx+28],edi ; set new file size |
||
1296 | test edi,edi ; 0 length file? |
||
1297 | jnz truncate_save_size ; no |
||
1298 | mov [ebx+20],di ; FAT entry = 0 |
||
1299 | mov [ebx+26],di |
||
1300 | |||
1301 | truncate_save_size: |
||
1302 | call set_current_time_for_entry |
||
1303 | mov ebx,buffer |
||
1304 | call hd_write |
||
74 | mario79 | 1305 | cmp [hd_error],0 |
1306 | jne append_access |
||
1307 | |||
1 | ha | 1308 | mov eax,edx ; first cluster |
1309 | test edi,edi ; 0 length file? |
||
1310 | jz truncate_clear_chain |
||
1311 | |||
1312 | imul esi,[SECTORS_PER_CLUSTER],512 ; esi = cluster size in bytes |
||
1313 | |||
1314 | truncate_new_cluster: |
||
1315 | cmp eax,2 ; incorrect fat chain? |
||
1316 | jb truncate_eof ; yes |
||
1317 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1318 | jnb truncate_eof ; yes |
||
1319 | sub edi,esi |
||
1320 | jbe truncate_pos_found |
||
1321 | call get_FAT ; get next cluster |
||
74 | mario79 | 1322 | cmp [hd_error],0 |
1323 | jne append_access |
||
1324 | |||
1 | ha | 1325 | jmp truncate_new_cluster |
1326 | |||
1327 | truncate_pos_found: |
||
1328 | mov edx,[fatEND] ; new end for cluster chain |
||
1329 | mov [f_del],1 |
||
1330 | call set_FAT |
||
74 | mario79 | 1331 | cmp [hd_error],0 |
1332 | jne append_access |
||
1333 | |||
1 | ha | 1334 | mov [f_del],0 |
1335 | mov eax,edx ; clear rest of chain |
||
1336 | |||
1337 | truncate_clear_chain: |
||
1338 | call clear_cluster_chain |
||
74 | mario79 | 1339 | cmp [hd_error],0 |
1340 | jne append_access |
||
1 | ha | 1341 | |
1342 | truncate_eof: |
||
1343 | popad |
||
1344 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 1345 | cmp [hd_error],0 |
1346 | jne append_access_2 |
||
1347 | |||
1 | ha | 1348 | mov [hd1_status],0 |
1349 | xor ebx,ebx |
||
1350 | xor eax,eax |
||
1351 | ret |
||
1352 | |||
1353 | |||
1354 | find_filepos: |
||
1355 | ;----------------------------------------------------- |
||
1356 | ; input : eax = first cluster |
||
1357 | ; edi = bytes to skip over (start position) |
||
1358 | ; output : if CARRY=0 file position found |
||
1359 | ; if CARRY=1 end of file found |
||
1360 | ; eax = current file sector |
||
1361 | ; ebx = last cluster |
||
1362 | ; ecx = sector count in last cluster |
||
1363 | ; edi = bytes to skip over (sector position) |
||
1364 | ;----------------------------------------------------- |
||
1365 | push esi |
||
1366 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1367 | imul esi,ecx,512 ; esi = cluster size in bytes |
||
1368 | mov ebx,eax |
||
1369 | |||
1370 | filepos_new_cluster: |
||
1371 | cmp eax,2 ; incorrect fat chain? |
||
1372 | jb filepos_eof ; yes |
||
1373 | cmp eax,[fatRESERVED] ; is it end of file? |
||
1374 | jnb filepos_eof ; yes |
||
1375 | |||
1376 | mov ebx,eax |
||
1377 | cmp edi,esi ; skip over full cluster? |
||
1378 | jb filepos_cluster_ok ; no |
||
1379 | |||
1380 | sub edi,esi |
||
1381 | call get_FAT ; get next cluster |
||
74 | mario79 | 1382 | cmp [hd_error],0 |
1383 | jne filepos_eof |
||
1384 | |||
1 | ha | 1385 | jmp filepos_new_cluster |
1386 | |||
1387 | filepos_cluster_ok: |
||
1388 | sub eax,2 |
||
1389 | imul eax,ecx |
||
1390 | add eax,[DATA_START] |
||
1391 | |||
1392 | filepos_new_sector: |
||
1393 | cmp edi,512 ; skip over full sector? |
||
1394 | jb filepos_sector_ok ; no |
||
1395 | sub edi,512 |
||
1396 | inc eax |
||
1397 | dec ecx |
||
1398 | jnz filepos_new_sector |
||
1399 | |||
1400 | filepos_eof: |
||
1401 | pop esi |
||
1402 | stc |
||
1403 | ret |
||
1404 | |||
1405 | filepos_sector_ok: |
||
1406 | pop esi |
||
1407 | clc |
||
1408 | ret |
||
1409 | |||
1410 | |||
1411 | file_write: |
||
1412 | ;-------------------------------------------------------------------------- |
||
1413 | ; INPUT : user-reg register-in-this meaning symbol-in-this-routine |
||
1414 | ; |
||
1415 | ; EAX EDI system call to write / |
||
1416 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1417 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1418 | ; ECX EBX (PAR2) file size PAR2 |
||
1419 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1420 | ; |
||
1421 | ; output : eax = 0 - ok |
||
1422 | ; 3 - unknown FS |
||
1423 | ; 5 - file not found |
||
1424 | ; 8 - disk full |
||
1425 | ; 10 - access denied |
||
1426 | ;-------------------------------------------------------------------------- |
||
1427 | cmp [fat_type],0 |
||
1428 | jnz fat_ok_for_writing |
||
1429 | mov eax,ERROR_UNKNOWN_FS |
||
1430 | ret |
||
1431 | |||
1432 | fat_ok_for_writing: |
||
1433 | ; call reserve_hd1 |
||
1434 | |||
1435 | pushad |
||
1436 | |||
1437 | xor edi,edi ; don't allow directory remove |
||
1438 | call file_delete ; try to delete the file first |
||
74 | mario79 | 1439 | cmp [hd_error],0 |
1440 | jne exit_write_access_1 |
||
1441 | |||
1 | ha | 1442 | test eax,eax |
1443 | jz old_deleted ; deleted ok |
||
1444 | cmp eax,ERROR_FILE_NOT_FOUND |
||
1445 | jnz exit_write_access ; it exist but can't delete |
||
1446 | |||
1447 | old_deleted: |
||
1448 | mov ebx,PUSHAD_EDX |
||
1449 | call get_cluster_of_a_path |
||
1450 | jnc found_directory_for_writing |
||
74 | mario79 | 1451 | cmp [hd_error],0 |
1452 | jne exit_write_access |
||
1 | ha | 1453 | |
1454 | exit_writing_with_error: |
||
1455 | popad |
||
1456 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 1457 | cmp [hd_error],0 |
1458 | jne exit_write_access_2 |
||
1459 | |||
1 | ha | 1460 | mov [hd1_status],0 |
1461 | mov eax,ERROR_FILE_NOT_FOUND |
||
1462 | ret |
||
1463 | |||
1464 | exit_writing_disk_full_clear: |
||
74 | mario79 | 1465 | cmp [hd_error],0 |
1466 | jne exit_write_access_1 |
||
1 | ha | 1467 | mov eax,[sector_tmp] |
1468 | mov ebx,buffer |
||
1469 | call hd_read ; read directory sector |
||
74 | mario79 | 1470 | cmp [hd_error],0 |
1471 | jne exit_write_access_1 |
||
1472 | |||
1 | ha | 1473 | mov edx,[entry_pos] |
1474 | mov byte [edx],0xe5 ; mark as deleted |
||
1475 | call hd_write |
||
74 | mario79 | 1476 | cmp [hd_error],0 |
1477 | jne exit_write_access_1 |
||
1478 | |||
1 | ha | 1479 | mov eax,[edx+20-2] ; FAT entry |
1480 | mov ax,[edx+26] |
||
1481 | and eax,[fatMASK] |
||
1482 | call clear_cluster_chain |
||
1483 | |||
1484 | exit_writing_disk_full: |
||
74 | mario79 | 1485 | cmp [hd_error],0 |
1486 | jne exit_write_access_1 |
||
1 | ha | 1487 | popad |
1488 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 1489 | cmp [hd_error],0 |
1490 | jne exit_write_access_2 |
||
1 | ha | 1491 | mov [hd1_status],0 |
1492 | mov eax,ERROR_DISK_FULL |
||
1493 | ret |
||
1494 | |||
1495 | exit_write_access: |
||
1496 | popad |
||
1497 | call update_disk ; write all of cache and fat to hd |
||
1498 | mov [hd1_status],0 |
||
1499 | mov eax,ERROR_ACCESS_DENIED |
||
1500 | ret |
||
1501 | |||
74 | mario79 | 1502 | exit_write_access_1: |
1503 | popad |
||
1504 | exit_write_access_2: |
||
1505 | mov [hd1_status],0 |
||
1506 | mov eax,ERROR_ACCESS_DENIED |
||
1507 | ret |
||
1508 | |||
1 | ha | 1509 | found_directory_for_writing: |
1510 | call analyze_directory_to_write |
||
1511 | jc exit_writing_disk_full |
||
1512 | |||
1513 | mov [sector_tmp],eax |
||
1514 | mov [entry_pos],ebx |
||
1515 | push eax ; save directory sector |
||
1516 | mov eax,2 |
||
1517 | call get_free_FAT |
||
1518 | mov [cluster],eax ; first free cluster |
||
1519 | pop eax |
||
1520 | jc exit_writing_disk_full |
||
1521 | |||
1522 | mov esi,PUSHAD_EAX ; file name |
||
1523 | mov edi,ebx ; pointer in buffer |
||
1524 | mov ecx,11 |
||
1525 | cld |
||
1526 | rep movsb |
||
1527 | |||
1528 | mov esi,PUSHAD_EBX ; file size (bytes left) |
||
1529 | mov [ebx+28],esi ; file size |
||
1530 | mov ecx,[cluster] |
||
1531 | mov [ebx+26],cx ; 16 bits low of cluster |
||
1532 | shr ecx,16 |
||
1533 | mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16) |
||
1534 | mov byte [ebx+11],0x20 ; attribute = archive |
||
1535 | |||
1536 | call set_current_time_for_entry |
||
1537 | |||
1538 | mov ebx,buffer ; save the directory name,length,cluster |
||
1539 | call hd_write |
||
74 | mario79 | 1540 | cmp [hd_error],0 |
1541 | jne exit_write_access_1 |
||
1 | ha | 1542 | |
1543 | imul edi,[SECTORS_PER_CLUSTER],512 ; edi = cluster size in bytes |
||
1544 | xor ecx,ecx ; cluster count |
||
1545 | mov ebx,PUSHAD_ECX ; ebx = buffer |
||
1546 | |||
1547 | hd_new_block_write: |
||
1548 | |||
1549 | mov eax,[cluster] ; eax = block |
||
1550 | call set_data_cluster |
||
74 | mario79 | 1551 | cmp [hd_error],0 |
1552 | jne exit_write_access_1 |
||
1 | ha | 1553 | |
1554 | sub esi,edi ; sub wrote bytes |
||
1555 | jbe file_saved_OK ; end if all done |
||
1556 | add ebx,edi ; update buffer position |
||
1557 | |||
1558 | inc eax |
||
1559 | call get_free_FAT ; next free in FAT |
||
1560 | jc exit_writing_disk_full_clear |
||
1561 | |||
1562 | mov edx,eax |
||
1563 | xchg eax,[cluster] ; get old cluster and save new cluster |
||
1564 | call set_FAT ; add it in cluster chain |
||
74 | mario79 | 1565 | cmp [hd_error],0 |
1566 | jne exit_write_access_1 |
||
1567 | |||
1 | ha | 1568 | dec ecx ; update cluster count |
1569 | jmp hd_new_block_write |
||
1570 | |||
1571 | file_saved_OK: |
||
1572 | |||
1573 | mov edx,[fatEND] ; new end for cluster chain |
||
1574 | call set_FAT |
||
74 | mario79 | 1575 | cmp [hd_error],0 |
1576 | jne exit_write_access_1 |
||
1577 | |||
1 | ha | 1578 | dec ecx ; update cluster count |
1579 | |||
1580 | call add_disk_free_space ; remove clusters from free disk space |
||
74 | mario79 | 1581 | cmp [hd_error],0 |
1582 | jne exit_write_access_1 |
||
1 | ha | 1583 | |
1584 | popad |
||
1585 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 1586 | cmp [hd_error],0 |
1587 | jne exit_write_access_2 |
||
1 | ha | 1588 | mov [hd1_status],0 |
1589 | xor eax,eax |
||
1590 | ret |
||
1591 | |||
1592 | |||
1593 | file_read: |
||
1594 | ;-------------------------------------------------------------------------- |
||
1595 | ; INPUT : user-register register-in-this meaning symbol-in-this |
||
1596 | ; |
||
1597 | ; EAX EDI system call to write / |
||
1598 | ; EBX EAX (PAR0) pointer to file-name PAR0 |
||
1599 | ; EDX ECX (PAR1) pointer to buffer PAR1 |
||
1600 | ; ECX EBX (PAR2) vt file blocks to read PAR2 |
||
1601 | ; ESI EDX (PAR3) pointer to path PAR3 |
||
1602 | ; EDI ESI vt first 512 block to read |
||
1603 | ; EDI if 0 - read root |
||
1604 | ; |
||
1605 | ; output : eax = 0 - ok |
||
1606 | ; 3 - unknown FS |
||
1607 | ; 5 - file not found |
||
1608 | ; 6 - end of file |
||
1609 | ; 9 - fat table corrupted |
||
74 | mario79 | 1610 | ; 10 - access denied |
1 | ha | 1611 | ; ebx = size of file/directory |
1612 | ;-------------------------------------------------------------------------- |
||
1613 | cmp [fat_type],0 |
||
1614 | jnz fat_ok_for_reading |
||
1615 | xor ebx,ebx |
||
1616 | mov eax,ERROR_UNKNOWN_FS |
||
63 | halyavin | 1617 | mov [hd1_status], ebx |
1 | ha | 1618 | ret |
1619 | |||
1620 | fat_ok_for_reading: |
||
1621 | ; call reserve_hd1 |
||
1622 | |||
1623 | pushad |
||
1624 | |||
1625 | mov ebx,edx |
||
1626 | call get_cluster_of_a_path |
||
1627 | jc file_to_read_not_found |
||
1628 | |||
1629 | test edi,edi ; read rootdir |
||
1630 | jne no_read_root |
||
1631 | |||
1632 | xor eax,eax |
||
1633 | call get_dir_size ; return rootdir size |
||
74 | mario79 | 1634 | cmp [hd_error],0 |
1635 | jne file_access_denied |
||
1636 | |||
1 | ha | 1637 | mov [file_size],eax |
1638 | mov eax,[ROOT_CLUSTER] |
||
1639 | jmp file_read_start |
||
1640 | |||
1641 | no_read_root: |
||
1642 | mov ebx,PUSHAD_EAX ; file name |
||
1643 | call analyze_directory |
||
1644 | jc file_to_read_not_found |
||
1645 | |||
1646 | mov eax,[ebx+28] ; file size |
||
1647 | test byte [ebx+11],0x10 ; is it directory? |
||
1648 | jz read_set_size ; no |
||
1649 | |||
1650 | mov eax,[ebx+20-2] ; FAT entry |
||
1651 | mov ax,[ebx+26] |
||
1652 | and eax,[fatMASK] |
||
1653 | call get_dir_size |
||
74 | mario79 | 1654 | cmp [hd_error],0 |
1655 | jne file_access_denied |
||
1 | ha | 1656 | |
1657 | read_set_size: |
||
1658 | mov [file_size],eax |
||
1659 | |||
1660 | mov eax,[ebx+20-2] ; FAT entry |
||
1661 | mov ax,[ebx+26] |
||
1662 | and eax,[fatMASK] |
||
1663 | |||
1664 | file_read_start: |
||
1665 | mov ebx,PUSHAD_ECX ; pointer to buffer |
||
1666 | mov edx,PUSHAD_EBX ; file blocks to read |
||
1667 | mov esi,PUSHAD_ESI ; first 512 block to read |
||
1668 | |||
1669 | file_read_new_cluster: |
||
1670 | call get_data_cluster |
||
1671 | jc file_read_eof ; end of file or cluster out of range |
||
1672 | |||
1673 | test edx,edx ; is all read? |
||
1674 | je file_read_OK ; yes |
||
1675 | |||
1676 | call get_FAT ; get next cluster |
||
74 | mario79 | 1677 | cmp [hd_error],0 |
1678 | jne file_access_denied |
||
1679 | |||
1 | ha | 1680 | cmp eax,[fatRESERVED] ; end of file |
1681 | jnb file_read_eof |
||
1682 | cmp eax,2 ; incorrect fat chain |
||
1683 | jnb file_read_new_cluster |
||
1684 | |||
1685 | popad |
||
1686 | mov [hd1_status],0 |
||
1687 | mov ebx,[file_size] |
||
1688 | mov eax,ERROR_FAT_TABLE |
||
1689 | ret |
||
1690 | |||
1691 | file_read_eof: |
||
74 | mario79 | 1692 | cmp [hd_error],0 |
1693 | jne file_access_denied |
||
1 | ha | 1694 | popad |
1695 | mov [hd1_status],0 |
||
1696 | mov ebx,[file_size] |
||
1697 | mov eax,ERROR_END_OF_FILE |
||
1698 | ret |
||
1699 | |||
1700 | file_read_OK: |
||
1701 | popad |
||
1702 | mov [hd1_status],0 |
||
1703 | mov ebx,[file_size] |
||
1704 | xor eax,eax |
||
1705 | ret |
||
1706 | |||
1707 | file_to_read_not_found: |
||
74 | mario79 | 1708 | cmp [hd_error],0 |
1709 | jne file_access_denied |
||
1 | ha | 1710 | popad |
1711 | mov [hd1_status],0 |
||
1712 | xor ebx,ebx |
||
1713 | mov eax,ERROR_FILE_NOT_FOUND |
||
1714 | ret |
||
1715 | |||
74 | mario79 | 1716 | file_access_denied: |
1717 | popad |
||
1718 | mov [hd1_status],0 |
||
1719 | xor ebx,ebx |
||
1720 | mov eax,ERROR_ACCESS_DENIED |
||
1721 | ret |
||
1 | ha | 1722 | |
1723 | get_dir_size: |
||
1724 | ;----------------------------------------------------- |
||
1725 | ; input : eax = first cluster (0=rootdir) |
||
1726 | ; output : eax = directory size in bytes |
||
1727 | ;----------------------------------------------------- |
||
1728 | push edx |
||
1729 | xor edx,edx ; count of directory clusters |
||
1730 | test eax,eax |
||
1731 | jnz dir_size_next |
||
1732 | |||
1733 | mov eax,[ROOT_SECTORS] |
||
1734 | shl eax,9 ; fat16 rootdir size in bytes |
||
1735 | cmp [fat_type],16 |
||
1736 | je dir_size_ret |
||
1737 | mov eax,[ROOT_CLUSTER] |
||
1738 | |||
1739 | dir_size_next: |
||
1740 | cmp eax,2 ; incorrect fat chain |
||
1741 | jb dir_size_end |
||
1742 | cmp eax,[fatRESERVED] ; end of directory |
||
1743 | ja dir_size_end |
||
1744 | call get_FAT ; get next cluster |
||
74 | mario79 | 1745 | cmp [hd_error],0 |
1746 | jne dir_size_ret |
||
1747 | |||
1 | ha | 1748 | inc edx |
1749 | jmp dir_size_next |
||
1750 | |||
1751 | dir_size_end: |
||
1752 | imul eax,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
1753 | imul eax,edx |
||
1754 | |||
1755 | dir_size_ret: |
||
1756 | pop edx |
||
1757 | ret |
||
1758 | |||
1759 | |||
1760 | file_delete: |
||
1761 | ;----------------------------------------------------- |
||
1762 | ; input : eax = file/directory name |
||
1763 | ; edx = path |
||
1764 | ; edi = 1 - allow directory remove else don't remove directory |
||
1765 | ; output : eax = 0 - ok |
||
1766 | ; 3 - unknown FS |
||
1767 | ; 5 - file not found |
||
1768 | ; 10 - access denied |
||
1769 | ;----------------------------------------------------- |
||
1770 | cmp [fat_type],0 |
||
1771 | jnz file_del_fat_ok |
||
1772 | mov eax,ERROR_UNKNOWN_FS |
||
1773 | ret |
||
1774 | |||
1775 | file_del_fat_ok: |
||
1776 | pushad |
||
1777 | |||
1778 | mov ebx,edx |
||
1779 | call get_cluster_of_a_path |
||
1780 | jc file_to_delete_not_found |
||
1781 | |||
1782 | mov ebx,PUSHAD_EAX ; file/directory name |
||
1783 | call analyze_directory |
||
1784 | jc file_to_delete_not_found |
||
1785 | |||
1786 | test byte [ebx+11],0x10 ; is it directory? |
||
1787 | jz delete_notdir ; no. it's file |
||
1788 | cmp edi,1 ; allow directory remove |
||
1789 | jnz delete_no_access ; no |
||
1790 | |||
1791 | push eax ; save directory sector |
||
1792 | mov eax,[ebx+20-2] ; first cluster of file |
||
1793 | mov ax,[ebx+26] ; 0 length files start cluster = 0 |
||
1794 | and eax,[fatMASK] |
||
1795 | xor ebp,ebp ; counter for directory deepnes |
||
1796 | call clear_directory |
||
1797 | pop eax |
||
1798 | jc delete_no_access |
||
1799 | |||
1800 | push ebx ; save directory pointer in buffer |
||
1801 | mov ebx,buffer |
||
1802 | call hd_read ; read directory sector |
||
74 | mario79 | 1803 | cmp [hd_error],0 |
1804 | jne delete_no_access_1 |
||
1 | ha | 1805 | pop ebx |
1806 | |||
1807 | delete_notdir: |
||
1808 | call delete_entry_name |
||
74 | mario79 | 1809 | cmp [hd_error],0 |
1810 | jne delete_no_access |
||
1811 | |||
1 | ha | 1812 | mov eax,ecx ; first cluster of file |
1813 | call clear_cluster_chain |
||
74 | mario79 | 1814 | cmp [hd_error],0 |
1815 | jne delete_no_access |
||
1816 | |||
1 | ha | 1817 | popad |
1818 | xor eax,eax |
||
1819 | ret |
||
1820 | |||
74 | mario79 | 1821 | delete_no_access_1: |
1822 | add esp,4 |
||
1 | ha | 1823 | delete_no_access: |
1824 | popad |
||
1825 | mov eax,ERROR_ACCESS_DENIED |
||
1826 | ret |
||
1827 | |||
1828 | file_to_delete_not_found: |
||
74 | mario79 | 1829 | cmp [hd_error],0 |
1830 | jne delete_no_access |
||
1 | ha | 1831 | popad |
1832 | mov eax,ERROR_FILE_NOT_FOUND |
||
1833 | ret |
||
1834 | |||
1835 | |||
1836 | clear_cluster_chain: |
||
1837 | ;----------------------------------------------------- |
||
1838 | ; input : eax = first cluster |
||
1839 | ;----------------------------------------------------- |
||
1840 | push eax ecx edx |
||
1841 | xor ecx,ecx ; cluster count |
||
1842 | mov [f_del],1 ; delete on |
||
1843 | |||
1844 | clean_new_chain: |
||
1845 | cmp eax,[LAST_CLUSTER] ; end of file |
||
1846 | ja delete_OK |
||
1847 | cmp eax,2 ; unfinished fat chain or zero length file |
||
1848 | jb delete_OK |
||
1849 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1850 | jz delete_OK |
||
1851 | |||
1852 | xor edx,edx |
||
1853 | call set_FAT ; clear fat entry |
||
74 | mario79 | 1854 | cmp [hd_error],0 |
1855 | jne access_denied_01 |
||
1856 | |||
1 | ha | 1857 | inc ecx ; update cluster count |
1858 | mov eax,edx ; old cluster |
||
1859 | jmp clean_new_chain |
||
1860 | |||
1861 | delete_OK: |
||
1862 | call add_disk_free_space ; add clusters to free disk space |
||
74 | mario79 | 1863 | access_denied_01: |
1 | ha | 1864 | mov [f_del],0 |
1865 | pop edx ecx eax |
||
1866 | ret |
||
1867 | |||
1868 | |||
1869 | clear_directory: |
||
1870 | ;----------------------------------------------------- |
||
1871 | ; input : eax = directory cluster |
||
1872 | ; ebp = directory deepnes |
||
1873 | ; Note : use recursive call |
||
1874 | ;----------------------------------------------------- |
||
1875 | pushad |
||
1876 | inc ebp |
||
1877 | cmp ebp,64 ; if over 63 directory deep |
||
1878 | jnb clear_error ; something must be wrong |
||
1879 | |||
1880 | clear_new_cluster: |
||
1881 | cmp eax,[LAST_CLUSTER] |
||
1882 | ja clear_end |
||
1883 | cmp eax,[ROOT_CLUSTER] ; don't remove root cluster |
||
1884 | jz clear_end |
||
1885 | mov esi,eax ; esi = current directory cluster |
||
1886 | sub eax,2 |
||
1887 | jb clear_end |
||
1888 | mov ecx,[SECTORS_PER_CLUSTER] |
||
1889 | imul eax,ecx |
||
1890 | add eax,[DATA_START] |
||
1891 | |||
1892 | clear_new_sector: |
||
1893 | mov edi,eax ; edi = current directory sector |
||
1894 | mov ebx,deltree_buffer |
||
1895 | call hd_read |
||
74 | mario79 | 1896 | cmp [hd_error],0 |
1897 | jne clear_error |
||
1898 | |||
1 | ha | 1899 | mov edx,512/32 ; count of dir entrys per sector = 16 |
1900 | |||
1901 | clear_analyze: |
||
1902 | mov al,[ebx+11] ; file attribute |
||
1903 | and al,0xf |
||
1904 | cmp al,0xf |
||
1905 | je clear_long_filename |
||
1906 | |||
1907 | cmp byte [ebx],'.' ; parent or current directory |
||
1908 | je clear_next_entry |
||
1909 | cmp byte [ebx],0xe5 ; deleted |
||
1910 | je clear_next_entry |
||
1911 | cmp byte [ebx],0 ; empty |
||
1912 | je clear_write_last |
||
1913 | ;je clear_next_entry |
||
1914 | |||
1915 | mov eax,[ebx+20-2] ; first cluster of entry |
||
1916 | mov ax,[ebx+26] |
||
1917 | and eax,[fatMASK] |
||
1918 | |||
1919 | test byte [ebx+11],0x10 ; is it directory? |
||
1920 | jz clear_file ; no |
||
1921 | |||
1922 | push eax ebx |
||
1923 | mov eax,edi |
||
1924 | mov ebx,deltree_buffer ; save buffer over recursive call |
||
1925 | call hd_write ; write directory sector to disk |
||
74 | mario79 | 1926 | cmp [hd_error],0 |
1927 | jne clear_error |
||
1928 | |||
1 | ha | 1929 | pop ebx eax |
1930 | |||
1931 | call clear_directory ; recursive call !!! |
||
1932 | jc clear_error ; exit if error found |
||
1933 | |||
1934 | push eax ebx |
||
1935 | mov eax,edi |
||
1936 | mov ebx,deltree_buffer |
||
1937 | call hd_read ; read directory sector again |
||
74 | mario79 | 1938 | cmp [hd_error],0 |
1939 | jne clear_error_1 |
||
1940 | |||
1 | ha | 1941 | pop ebx eax |
1942 | |||
1943 | clear_file: |
||
1944 | call clear_cluster_chain |
||
74 | mario79 | 1945 | cmp [hd_error],0 |
1946 | jne clear_error |
||
1 | ha | 1947 | |
1948 | clear_long_filename: |
||
1949 | mov byte [ebx],0xe5 |
||
1950 | |||
1951 | clear_next_entry: |
||
1952 | add ebx,32 ; position of next dir entry |
||
1953 | dec edx |
||
1954 | jnz clear_analyze |
||
1955 | |||
1956 | mov eax,edi |
||
1957 | mov ebx,deltree_buffer |
||
1958 | call hd_write ; write directory sector to disk |
||
74 | mario79 | 1959 | cmp [hd_error],0 |
1960 | jne clear_error |
||
1 | ha | 1961 | |
1962 | inc eax ; next sector |
||
1963 | dec ecx |
||
1964 | jnz clear_new_sector |
||
1965 | |||
1966 | mov eax,esi |
||
1967 | call get_FAT ; get next cluster |
||
74 | mario79 | 1968 | cmp [hd_error],0 |
1969 | jne clear_error |
||
1970 | |||
1 | ha | 1971 | jmp clear_new_cluster ; clear it |
1972 | |||
1973 | clear_write_last: |
||
1974 | mov eax,edi |
||
1975 | mov ebx,deltree_buffer |
||
1976 | call hd_write ; write directory sector to disk |
||
74 | mario79 | 1977 | cmp [hd_error],0 |
1978 | jne clear_error |
||
1 | ha | 1979 | |
1980 | clear_end: |
||
1981 | popad |
||
1982 | clc |
||
1983 | ret |
||
74 | mario79 | 1984 | clear_error_1: |
1985 | add esp,8 |
||
1 | ha | 1986 | clear_error: |
1987 | popad |
||
1988 | stc |
||
1989 | ret |
||
1990 | |||
1991 | |||
1992 | delete_entry_name: |
||
1993 | ;----------------------------------------------------- |
||
1994 | ; input : eax = directory sector |
||
1995 | ; ebx = directory pointer in buffer |
||
1996 | ; longname_sec = 2 previous directory sectors |
||
1997 | ; output : ecx = first cluster |
||
1998 | ; change : eax,ebx,edx |
||
1999 | ;----------------------------------------------------- |
||
2000 | mov byte [ebx],0xe5 |
||
2001 | mov ecx,[ebx+20-2] ; first cluster of file |
||
2002 | mov cx,[ebx+26] ; 0 length files start cluster = 0 |
||
2003 | and ecx,[fatMASK] |
||
2004 | |||
2005 | delete_empty: |
||
2006 | sub ebx,32 |
||
2007 | cmp ebx,buffer |
||
2008 | jnb delete_test_long |
||
2009 | |||
2010 | mov ebx,buffer |
||
2011 | call hd_write ; write directory sector back |
||
74 | mario79 | 2012 | cmp [hd_error],0 |
2013 | jne delete_name_end |
||
2014 | |||
1 | ha | 2015 | xor eax,eax |
2016 | xchg eax,[longname_sec2] |
||
2017 | xchg eax,[longname_sec1] |
||
2018 | test eax,eax ; is there previous directory sector? |
||
2019 | jz delete_name_end ; no |
||
2020 | |||
2021 | mov ebx,buffer |
||
2022 | call hd_read ; read previous sector |
||
74 | mario79 | 2023 | cmp [hd_error],0 |
2024 | jne delete_name_end |
||
2025 | |||
1 | ha | 2026 | mov ebx,buffer+0x1e0 ; start from last entry |
2027 | |||
2028 | delete_test_long: |
||
2029 | mov dh,[ebx+11] ; file attribute |
||
2030 | and dh,0xf |
||
2031 | cmp dh,0xf |
||
2032 | jne delete_write_buffer |
||
2033 | |||
2034 | cmp byte [ebx],0x40 ; end of long dir entry? |
||
2035 | mov byte [ebx],0xe5 |
||
2036 | jb delete_empty |
||
2037 | |||
2038 | delete_write_buffer: |
||
2039 | mov ebx,buffer |
||
2040 | call hd_write ; write directory sector back |
||
2041 | |||
2042 | delete_name_end: |
||
2043 | ret |
||
2044 | |||
2045 | |||
2046 | rename: |
||
2047 | ;----------------------------------------------------------- |
||
2048 | ; input : eax = source directory name |
||
2049 | ; edx = source path |
||
2050 | ; ebx = dest directory name |
||
2051 | ; edi = dest path |
||
2052 | ; output : eax = 0 - ok |
||
2053 | ; 3 - unknown FS |
||
2054 | ; 5 - file not found |
||
2055 | ; 8 - disk full |
||
2056 | ; 10 - access denied |
||
2057 | ;----------------------------------------------------------- |
||
2058 | cmp [fat_type],0 |
||
2059 | jnz fat_ok_for_rename |
||
2060 | mov eax,ERROR_UNKNOWN_FS |
||
2061 | ret |
||
2062 | |||
2063 | fat_ok_for_rename: |
||
2064 | ; call reserve_hd1 |
||
2065 | |||
2066 | pushad |
||
2067 | |||
2068 | mov ebx,edx ; source path |
||
2069 | call get_cluster_of_a_path |
||
2070 | jc rename_entry_not_found |
||
2071 | |||
2072 | mov ebx,PUSHAD_EAX ; source directory name |
||
2073 | call analyze_directory |
||
2074 | jc rename_entry_not_found |
||
2075 | |||
2076 | mov [sector_tmp],eax ; save source sector |
||
2077 | mov [entry_pos],ebx |
||
2078 | mov esi,ebx |
||
2079 | mov edi,dir_entry |
||
2080 | mov ecx,32/4 |
||
2081 | cld |
||
2082 | rep movsd ; save entry |
||
2083 | |||
2084 | mov ebx,PUSHAD_EDI ; dest path |
||
2085 | call get_cluster_of_a_path |
||
2086 | jc rename_entry_not_found |
||
2087 | |||
2088 | mov edx,eax ; save dest directory cluster |
||
2089 | mov ebx,PUSHAD_EBX ; dest directory name |
||
2090 | push [longname_sec1] |
||
2091 | push [longname_sec2] |
||
2092 | call analyze_directory ; check if entry already exist |
||
74 | mario79 | 2093 | cmp [hd_error],0 |
2094 | jne rename_entry_already_exist_1 |
||
2095 | |||
1 | ha | 2096 | pop [longname_sec2] |
2097 | pop [longname_sec1] |
||
2098 | jnc rename_entry_already_exist |
||
2099 | |||
2100 | mov eax,edx |
||
2101 | call analyze_directory_to_write |
||
2102 | jc rename_disk_full |
||
2103 | |||
2104 | mov esi,dir_entry |
||
2105 | mov edi,ebx |
||
2106 | mov ecx,32/4 |
||
2107 | cld |
||
2108 | rep movsd ; copy entry |
||
2109 | mov esi,PUSHAD_EBX ; dest directory name |
||
2110 | mov edi,ebx |
||
2111 | mov ecx,11 |
||
2112 | rep movsb ; copy name |
||
2113 | |||
2114 | mov ebx,buffer ; save the directory name,length,cluster |
||
2115 | call hd_write |
||
2116 | |||
2117 | test byte [dir_entry+11],0x10 ; is it directory? |
||
2118 | jz rename_not_dir ; no |
||
2119 | mov eax,[dir_entry+20-2] ; FAT entry |
||
2120 | mov ax,[dir_entry+26] |
||
2121 | and eax,[fatMASK] |
||
2122 | call change_2dot_cluster |
||
74 | mario79 | 2123 | cmp [hd_error],0 |
2124 | jne rename_entry_already_exist |
||
1 | ha | 2125 | |
2126 | rename_not_dir: |
||
74 | mario79 | 2127 | cmp [hd_error],0 |
2128 | jne rename_entry_already_exist |
||
1 | ha | 2129 | mov eax,[sector_tmp] |
2130 | mov ebx,buffer |
||
2131 | call hd_read ; read source directory sector |
||
74 | mario79 | 2132 | cmp [hd_error],0 |
2133 | jne rename_entry_already_exist |
||
1 | ha | 2134 | |
2135 | mov ebx,[entry_pos] |
||
2136 | call delete_entry_name |
||
74 | mario79 | 2137 | cmp [hd_error],0 |
2138 | jne rename_entry_already_exist |
||
1 | ha | 2139 | |
2140 | popad |
||
2141 | call update_disk ; write all of cache and fat to hd |
||
74 | mario79 | 2142 | cmp [hd_error],0 |
2143 | jne rename_entry_already_exist_2 |
||
1 | ha | 2144 | mov [hd1_status],0 |
2145 | xor eax,eax |
||
2146 | ret |
||
2147 | |||
2148 | rename_entry_not_found: |
||
74 | mario79 | 2149 | cmp [hd_error],0 |
2150 | jne rename_entry_already_exist |
||
1 | ha | 2151 | popad |
2152 | mov [hd1_status],0 |
||
2153 | mov eax,ERROR_FILE_NOT_FOUND |
||
2154 | ret |
||
2155 | |||
74 | mario79 | 2156 | rename_entry_already_exist_1: |
2157 | add esp,8 |
||
1 | ha | 2158 | rename_entry_already_exist: |
2159 | popad |
||
74 | mario79 | 2160 | rename_entry_already_exist_2: |
1 | ha | 2161 | mov [hd1_status],0 |
2162 | mov eax,ERROR_ACCESS_DENIED |
||
2163 | ret |
||
2164 | |||
2165 | rename_disk_full: |
||
74 | mario79 | 2166 | cmp [hd_error],0 |
2167 | jne rename_entry_already_exist |
||
1 | ha | 2168 | popad |
2169 | mov [hd1_status],0 |
||
2170 | mov eax,ERROR_DISK_FULL |
||
2171 | ret |
||
2172 | |||
2173 | |||
2174 | change_2dot_cluster: |
||
2175 | ;----------------------------------------------------------- |
||
2176 | ; input : eax = directory cluster |
||
2177 | ; edx = value to save |
||
2178 | ; change : eax,ebx,edx |
||
2179 | ;----------------------------------------------------------- |
||
2180 | cmp eax,[LAST_CLUSTER] |
||
2181 | ja not_2dot ; too big cluster number, something is wrong |
||
2182 | sub eax,2 |
||
2183 | jb not_2dot |
||
2184 | |||
2185 | imul eax,[SECTORS_PER_CLUSTER] |
||
2186 | add eax,[DATA_START] |
||
2187 | mov ebx,buffer |
||
2188 | call hd_read |
||
74 | mario79 | 2189 | cmp [hd_error],0 |
2190 | jne not_2dot |
||
1 | ha | 2191 | |
2192 | cmp dword [ebx+32],'.. ' |
||
2193 | jnz not_2dot |
||
2194 | |||
2195 | cmp edx,[ROOT_CLUSTER] ; is rootdir cluster? |
||
2196 | jne not_2dot_root |
||
2197 | xor edx,edx ; yes. set it zero |
||
2198 | |||
2199 | not_2dot_root: |
||
2200 | mov [ebx+32+26],dx ; 16 bits low of cluster |
||
2201 | shr edx,16 |
||
2202 | mov [ebx+32+20],dx ; 16 bits high of cluster (=0 fat16) |
||
2203 | call hd_write |
||
2204 | |||
2205 | not_2dot: |
||
2206 | ret |
||
2207 | |||
2208 | |||
2209 | get_filesize: |
||
2210 | ;----------------------------------------------------------- |
||
2211 | ; input : eax = file name |
||
2212 | ; edx = path |
||
2213 | ; edi = if 0 - read rootdir else normal dir/file size |
||
2214 | ; output : eax = 0 - ok |
||
2215 | ; 3 - unknown FS |
||
2216 | ; 5 - file not found |
||
74 | mario79 | 2217 | ; 10 - access denied |
1 | ha | 2218 | ; ebx = file size |
2219 | ;----------------------------------------------------------- |
||
2220 | cmp [fat_type],0 |
||
2221 | jnz get_filesize_fat_ok |
||
2222 | xor ebx,ebx |
||
2223 | mov eax,ERROR_UNKNOWN_FS |
||
2224 | ret |
||
2225 | |||
2226 | get_filesize_fat_ok: |
||
2227 | ; call reserve_hd1 |
||
2228 | |||
2229 | pushad |
||
2230 | xor eax,eax |
||
2231 | test edi,edi ; is read rootdir? |
||
2232 | je get_filesize_dirsize ; yes |
||
2233 | |||
2234 | get_filesize_no_root: |
||
2235 | mov ebx,edx |
||
2236 | call get_cluster_of_a_path |
||
2237 | jc get_filesize_not_found |
||
2238 | |||
2239 | mov ebx,PUSHAD_EAX ; file name |
||
2240 | call analyze_directory |
||
2241 | jc get_filesize_not_found |
||
2242 | |||
2243 | mov eax,[ebx+28] ; file size |
||
2244 | test byte [ebx+11],0x10 ; is it directory? |
||
2245 | jz get_filesize_set_size ; no |
||
2246 | |||
2247 | mov eax,[ebx+20-2] ; FAT entry |
||
2248 | mov ax,[ebx+26] |
||
2249 | and eax,[fatMASK] |
||
2250 | |||
2251 | get_filesize_dirsize: |
||
2252 | call get_dir_size |
||
74 | mario79 | 2253 | cmp [hd_error],0 |
2254 | jne get_filesize_access_denied |
||
1 | ha | 2255 | |
2256 | get_filesize_set_size: |
||
2257 | mov PUSHAD_EBX,eax |
||
2258 | popad |
||
2259 | mov [hd1_status],0 |
||
2260 | xor eax,eax |
||
2261 | ret |
||
2262 | |||
2263 | get_filesize_not_found: |
||
74 | mario79 | 2264 | cmp [hd_error],0 |
2265 | jne get_filesize_access_denied |
||
1 | ha | 2266 | popad |
2267 | mov [hd1_status],0 |
||
2268 | xor ebx,ebx |
||
2269 | mov eax,ERROR_FILE_NOT_FOUND |
||
2270 | ret |
||
2271 | |||
74 | mario79 | 2272 | get_filesize_access_denied: |
2273 | popad |
||
2274 | mov [hd1_status],0 |
||
2275 | xor ebx,ebx |
||
2276 | mov eax,ERROR_ACCESS_DENIED |
||
2277 | ret |
||
1 | ha | 2278 | |
2279 | get_fileattr: |
||
2280 | ;----------------------------------------------------------- |
||
2281 | ; input : eax = file name |
||
2282 | ; edx = path |
||
2283 | ; output : eax = 0 - ok |
||
2284 | ; 3 - unknown FS |
||
2285 | ; 5 - file not found |
||
74 | mario79 | 2286 | ; 10 - access denied |
1 | ha | 2287 | ; ebx = file attribute |
2288 | ;----------------------------------------------------------- |
||
2289 | cmp [fat_type],0 |
||
2290 | jnz get_fileattr_fat_ok |
||
2291 | xor ebx,ebx |
||
2292 | mov eax,ERROR_UNKNOWN_FS |
||
2293 | ret |
||
2294 | |||
2295 | get_fileattr_fat_ok: |
||
2296 | ; call reserve_hd1 |
||
2297 | |||
2298 | pushad |
||
2299 | mov ebx,edx |
||
2300 | call get_cluster_of_a_path |
||
2301 | jc get_fileattr_not_found |
||
2302 | |||
2303 | mov ebx,PUSHAD_EAX ; file name |
||
2304 | call analyze_directory |
||
2305 | jc get_fileattr_not_found |
||
2306 | |||
2307 | movzx eax,byte [ebx+11] ; file attribute |
||
2308 | mov PUSHAD_EBX,eax |
||
2309 | popad |
||
2310 | mov [hd1_status],0 |
||
2311 | xor eax,eax |
||
2312 | ret |
||
2313 | |||
2314 | get_fileattr_not_found: |
||
74 | mario79 | 2315 | cmp [hd_error],0 |
2316 | jne get_fileattr_access_denied |
||
1 | ha | 2317 | popad |
2318 | mov [hd1_status],0 |
||
2319 | xor ebx,ebx |
||
2320 | mov eax,ERROR_FILE_NOT_FOUND |
||
2321 | ret |
||
2322 | |||
74 | mario79 | 2323 | get_fileattr_access_denied: |
2324 | popad |
||
2325 | mov [hd1_status],0 |
||
2326 | xor ebx,ebx |
||
2327 | mov eax,ERROR_ACCESS_DENIED |
||
2328 | ret |
||
1 | ha | 2329 | |
2330 | get_filedate: |
||
2331 | ;----------------------------------------------------------- |
||
2332 | ; input : eax = file name |
||
2333 | ; edx = path |
||
2334 | ; output : eax = 0 - ok |
||
2335 | ; 3 - unknown FS |
||
2336 | ; 5 - file not found |
||
74 | mario79 | 2337 | ; 10 - access denied |
1 | ha | 2338 | ; ebx = file date/time |
2339 | ; bits 31..25 = year-1980 |
||
2340 | ; bits 24..21 = month |
||
2341 | ; bits 20..16 = day |
||
2342 | ; bits 15..11 = hour |
||
2343 | ; bits 10..5 = minute |
||
2344 | ; bits 4..0 = second/2 |
||
2345 | ;----------------------------------------------------------- |
||
2346 | cmp [fat_type],0 |
||
2347 | jnz get_filedate_fat_ok |
||
2348 | xor ebx,ebx |
||
2349 | mov eax,ERROR_UNKNOWN_FS |
||
2350 | ret |
||
2351 | |||
2352 | get_filedate_fat_ok: |
||
2353 | ; call reserve_hd1 |
||
2354 | |||
2355 | pushad |
||
2356 | mov ebx,edx |
||
2357 | call get_cluster_of_a_path |
||
2358 | jc get_filedate_not_found |
||
2359 | |||
2360 | mov ebx,PUSHAD_EAX ; file name |
||
2361 | call analyze_directory |
||
2362 | jc get_filedate_not_found |
||
2363 | |||
2364 | mov eax,[ebx+22] ; file date/time |
||
2365 | mov PUSHAD_EBX,eax |
||
2366 | popad |
||
2367 | mov [hd1_status],0 |
||
2368 | xor eax,eax |
||
2369 | ret |
||
2370 | |||
2371 | get_filedate_not_found: |
||
74 | mario79 | 2372 | cmp [hd_error],0 |
2373 | jne get_filedate_access_denied |
||
1 | ha | 2374 | popad |
2375 | mov [hd1_status],0 |
||
2376 | xor ebx,ebx |
||
2377 | mov eax,ERROR_FILE_NOT_FOUND |
||
2378 | ret |
||
2379 | |||
74 | mario79 | 2380 | get_filedate_access_denied: |
2381 | popad |
||
2382 | mov [hd1_status],0 |
||
2383 | xor ebx,ebx |
||
2384 | mov eax,ERROR_ACCESS_DENIED |
||
2385 | ret |
||
1 | ha | 2386 | |
2387 | get_hd_info: |
||
2388 | ;----------------------------------------------------------- |
||
2389 | ; output : eax = 0 - ok |
||
2390 | ; 3 - unknown FS |
||
74 | mario79 | 2391 | ; 10 - access denied |
1 | ha | 2392 | ; edx = cluster size in bytes |
2393 | ; ebx = total clusters on disk |
||
2394 | ; ecx = free clusters on disk |
||
2395 | ;----------------------------------------------------------- |
||
2396 | cmp [fat_type],0 |
||
2397 | jnz info_fat_ok |
||
2398 | xor edx,edx |
||
2399 | xor ebx,ebx |
||
2400 | xor ecx,ecx |
||
2401 | mov eax,ERROR_UNKNOWN_FS |
||
2402 | ret |
||
2403 | |||
2404 | info_fat_ok: |
||
2405 | ; call reserve_hd1 |
||
2406 | |||
2407 | xor ecx,ecx ; count of free clusters |
||
2408 | mov eax,2 |
||
2409 | mov ebx,[LAST_CLUSTER] |
||
2410 | |||
2411 | info_cluster: |
||
2412 | push eax |
||
2413 | call get_FAT ; get cluster info |
||
74 | mario79 | 2414 | cmp [hd_error],0 |
2415 | jne info_access_denied |
||
2416 | |||
1 | ha | 2417 | test eax,eax ; is it free? |
2418 | jnz info_used ; no |
||
2419 | inc ecx |
||
2420 | |||
2421 | info_used: |
||
2422 | pop eax |
||
2423 | inc eax |
||
2424 | cmp eax,ebx ; is above last cluster? |
||
2425 | jbe info_cluster ; no. test next cluster |
||
2426 | |||
2427 | dec ebx ; cluster count |
||
2428 | imul edx,[SECTORS_PER_CLUSTER],512 ; cluster size in bytes |
||
2429 | mov [hd1_status],0 |
||
2430 | xor eax,eax |
||
2431 | ret |
||
2432 | |||
74 | mario79 | 2433 | info_access_denied: |
2434 | add esp,4 |
||
2435 | xor edx,edx |
||
2436 | xor ebx,ebx |
||
2437 | xor ecx,ecx |
||
2438 | mov eax,ERROR_ACCESS_DENIED |
||
2439 | ret |
||
1 | ha | 2440 | |
2441 | update_disk: |
||
2442 | ;----------------------------------------------------------- |
||
2443 | ; write changed fat and cache to disk |
||
2444 | ;----------------------------------------------------------- |
||
2445 | cmp [fat_change],0 ; is fat changed? |
||
2446 | je upd_no_change |
||
2447 | |||
2448 | call write_fat_sector |
||
74 | mario79 | 2449 | cmp [hd_error],0 |
2450 | jne update_disk_acces_denied |
||
1 | ha | 2451 | |
2452 | upd_no_change: |
||
2453 | |||
2454 | call write_cache |
||
74 | mario79 | 2455 | update_disk_acces_denied: |
1 | ha | 2456 | ret |
2457 | |||
2458 | |||
2459 | ;************************************************************************** |
||
2460 | ; |
||
2461 | ; 0x600008 - first entry in cache list |
||
2462 | ; |
||
2463 | ; +0 - lba sector |
||
2464 | ; +4 - state of cache sector |
||
2465 | ; 0 = empty |
||
2466 | ; 1 = used for read ( same as in hd ) |
||
2467 | ; 2 = used for write ( differs from hd ) |
||
2468 | ; |
||
2469 | ; +65536 - cache entries |
||
2470 | ; |
||
2471 | ;************************************************************************** |
||
2472 | |||
2473 | |||
2474 | hd_read: |
||
2475 | ;----------------------------------------------------------- |
||
2476 | ; input : eax = block to read |
||
2477 | ; ebx = destination |
||
2478 | ;----------------------------------------------------------- |
||
2479 | push ecx esi edi ; scan cache |
||
2480 | |||
2481 | mov ecx,cache_max ; entries in cache |
||
2482 | mov esi,0x600000+8 |
||
2483 | mov edi,1 |
||
2484 | |||
2485 | hdreadcache: |
||
2486 | |||
2487 | cmp dword [esi+4],0 ; empty |
||
2488 | je nohdcache |
||
2489 | |||
2490 | cmp [esi],eax ; correct sector |
||
2491 | je yeshdcache |
||
2492 | |||
2493 | nohdcache: |
||
2494 | |||
2495 | add esi,8 |
||
2496 | inc edi |
||
2497 | dec ecx |
||
2498 | jnz hdreadcache |
||
2499 | |||
2500 | call find_empty_slot ; ret in edi |
||
74 | mario79 | 2501 | cmp [hd_error],0 |
2502 | jne return_01 |
||
1 | ha | 2503 | |
2504 | push eax edx |
||
2505 | |||
74 | mario79 | 2506 | call wait_for_hd_idle |
2507 | cmp [hd_error],0 |
||
2508 | jne hd_read_error |
||
2509 | |||
1 | ha | 2510 | cli |
2511 | xor eax,eax |
||
2512 | mov edx,[hdbase] |
||
2513 | inc edx |
||
74 | mario79 | 2514 | out dx,al ; ATAFeatures ¥£ð¡¢ "®¡®¡¥®¡¢¥©" |
1 | ha | 2515 | inc edx |
2516 | inc eax |
||
74 | mario79 | 2517 | out dx,al ; ATASectorCount ¡§¥¢§ðª ¡¥ª¢® ®¢ |
1 | ha | 2518 | inc edx |
2519 | mov eax,[esp+4] |
||
74 | mario79 | 2520 | out dx,al ; ATASectorNumber ¥£ð¡¢ ®¬¥ ¡¥ª¢® |
1 | ha | 2521 | shr eax,8 |
2522 | inc edx |
||
74 | mario79 | 2523 | out dx,al ; ATACylinder ®¬¥ ¦ð«ð¤ (¬« ¤¨ð© ¡ ©¢) |
1 | ha | 2524 | shr eax,8 |
2525 | inc edx |
||
74 | mario79 | 2526 | out dx,al ; ®¬¥ ¦ð«ð¤ (¡¢ ¨ð© ¡ ©¢) |
1 | ha | 2527 | shr eax,8 |
2528 | inc edx |
||
2529 | and al,1+2+4+8 |
||
2530 | add al,byte [hdid] |
||
2531 | add al,128+64+32 |
||
74 | mario79 | 2532 | out dx,al ; ®¬¥ £®«®¢ªð/®¬¥ ¤ð¡ª |
1 | ha | 2533 | inc edx |
2534 | mov al,20h |
||
74 | mario79 | 2535 | out dx,al ; ATACommand ¥£ð¡¢ ª®¬ ¤ |
1 | ha | 2536 | sti |
2537 | |||
2538 | call wait_for_sector_buffer |
||
2539 | |||
2540 | cmp [hd_error],0 |
||
2541 | jne hd_read_error |
||
2542 | |||
2543 | cli |
||
2544 | push edi |
||
2545 | shl edi,9 |
||
2546 | add edi,0x600000+65536 |
||
2547 | mov ecx,256 |
||
2548 | mov edx,[hdbase] |
||
2549 | cld |
||
2550 | rep insw |
||
2551 | pop edi |
||
2552 | sti |
||
2553 | |||
2554 | pop edx eax |
||
2555 | blok_read_2: |
||
2556 | lea esi,[edi*8+0x600000] |
||
2557 | mov [esi],eax ; sector number |
||
2558 | mov dword [esi+4],1 ; hd read - mark as same as in hd |
||
2559 | |||
2560 | yeshdcache: |
||
2561 | |||
2562 | mov esi,edi |
||
2563 | shl esi,9 |
||
2564 | add esi,0x600000+65536 |
||
2565 | mov edi,ebx |
||
2566 | mov ecx,512/4 |
||
2567 | cld |
||
2568 | rep movsd ; move data |
||
74 | mario79 | 2569 | return_01: |
1 | ha | 2570 | pop edi esi ecx |
2571 | ret |
||
2572 | |||
2573 | |||
2574 | hd_write: |
||
2575 | ;----------------------------------------------------------- |
||
2576 | ; input : eax = block |
||
2577 | ; ebx = pointer to memory |
||
2578 | ;----------------------------------------------------------- |
||
2579 | push ecx esi edi |
||
2580 | |||
2581 | ; check if the cache already has the sector and overwrite it |
||
2582 | |||
2583 | mov ecx,cache_max |
||
2584 | mov esi,0x600000+8 |
||
2585 | mov edi,1 |
||
2586 | |||
2587 | hdwritecache: |
||
2588 | |||
2589 | cmp dword [esi+4],0 ; if cache slot is empty |
||
2590 | je not_in_cache_write |
||
2591 | |||
2592 | cmp [esi],eax ; if the slot has the sector |
||
2593 | je yes_in_cache_write |
||
2594 | |||
2595 | not_in_cache_write: |
||
2596 | |||
2597 | add esi,8 |
||
2598 | inc edi |
||
2599 | dec ecx |
||
2600 | jnz hdwritecache |
||
2601 | |||
2602 | ; sector not found in cache |
||
2603 | ; write the block to a new location |
||
2604 | |||
2605 | call find_empty_slot ; ret in edi |
||
74 | mario79 | 2606 | cmp [hd_error],0 |
2607 | jne hd_write_access_denied |
||
1 | ha | 2608 | |
2609 | lea esi,[edi*8+0x600000] |
||
2610 | mov [esi],eax ; sector number |
||
2611 | |||
2612 | yes_in_cache_write: |
||
2613 | |||
2614 | mov dword [esi+4],2 ; write - differs from hd |
||
2615 | |||
2616 | shl edi,9 |
||
2617 | add edi,0x600000+65536 |
||
2618 | mov esi,ebx |
||
2619 | mov ecx,512/4 |
||
2620 | cld |
||
2621 | rep movsd ; move data |
||
74 | mario79 | 2622 | hd_write_access_denied: |
1 | ha | 2623 | pop edi esi ecx |
2624 | ret |
||
2625 | |||
2626 | |||
2627 | write_cache: |
||
2628 | ;----------------------------------------------------------- |
||
2629 | ; write all changed sectors to disk |
||
2630 | ;----------------------------------------------------------- |
||
2631 | push eax ecx edx esi edi |
||
2632 | |||
2633 | ; write difference ( 2 ) from cache to hd |
||
2634 | |||
2635 | mov ecx,cache_max |
||
2636 | mov esi,0x600000+8 |
||
2637 | mov edi,1 |
||
2638 | |||
2639 | write_cache_more: |
||
2640 | |||
2641 | cmp dword [esi+4],2 ; if cache slot is not different |
||
2642 | jne does_not_need_writing |
||
2643 | |||
2644 | mov dword [esi+4],1 ; same as in hd |
||
2645 | mov eax,[esi] ; eax = sector to write |
||
2646 | |||
2647 | cmp eax,[PARTITION_START] |
||
2648 | jb danger |
||
2649 | cmp eax,[PARTITION_END] |
||
2650 | ja danger |
||
2651 | |||
2652 | call wait_for_hd_idle |
||
74 | mario79 | 2653 | cmp [hd_error],0 |
2654 | jne hd_write_error |
||
1 | ha | 2655 | |
2656 | cli |
||
2657 | xor eax,eax |
||
2658 | mov edx,[hdbase] |
||
2659 | inc edx |
||
2660 | out dx,al |
||
2661 | inc edx |
||
2662 | inc eax |
||
2663 | out dx,al |
||
2664 | inc edx |
||
2665 | mov eax,[esi] ; eax = sector to write |
||
2666 | out dx,al |
||
2667 | shr eax,8 |
||
2668 | inc edx |
||
2669 | out dx,al |
||
2670 | shr eax,8 |
||
2671 | inc edx |
||
2672 | out dx,al |
||
2673 | shr eax,8 |
||
2674 | inc edx |
||
2675 | and al,1+2+4+8 |
||
2676 | add al,byte [hdid] |
||
2677 | add al,128+64+32 |
||
2678 | out dx,al |
||
2679 | inc edx |
||
2680 | mov al,30h |
||
2681 | out dx,al |
||
2682 | sti |
||
2683 | |||
2684 | call wait_for_sector_buffer |
||
2685 | |||
2686 | cmp [hd_error],0 |
||
2687 | jne hd_write_error |
||
2688 | |||
2689 | push ecx esi |
||
2690 | |||
2691 | cli |
||
2692 | mov esi,edi |
||
2693 | shl esi,9 |
||
2694 | add esi,0x600000+65536 ; esi = from memory position |
||
2695 | mov ecx,256 |
||
2696 | mov edx,[hdbase] |
||
2697 | cld |
||
2698 | rep outsw |
||
2699 | sti |
||
2700 | |||
2701 | pop esi ecx |
||
2702 | |||
2703 | danger: |
||
2704 | does_not_need_writing: |
||
2705 | |||
2706 | add esi,8 |
||
2707 | inc edi |
||
2708 | dec ecx |
||
2709 | jnz write_cache_more |
||
74 | mario79 | 2710 | return_02: |
1 | ha | 2711 | pop edi esi edx ecx eax |
2712 | ret |
||
2713 | |||
2714 | |||
2715 | find_empty_slot: |
||
2716 | ;----------------------------------------------------------- |
||
2717 | ; find empty or read slot, flush cache if next 10% is used by write |
||
2718 | ; output : edi = cache slot |
||
2719 | ;----------------------------------------------------------- |
||
2720 | push ecx esi |
||
2721 | |||
2722 | search_again: |
||
2723 | |||
2724 | mov ecx,cache_max*10/100 |
||
2725 | mov edi,[cache_search_start] |
||
2726 | |||
2727 | search_for_empty: |
||
2728 | |||
2729 | inc edi |
||
2730 | cmp edi,cache_max |
||
2731 | jbe inside_cache |
||
2732 | mov edi,1 |
||
2733 | |||
2734 | inside_cache: |
||
2735 | |||
2736 | cmp dword [edi*8+0x600000+4],2 ; get cache slot info |
||
2737 | jb found_slot ; it's empty or read |
||
2738 | dec ecx |
||
2739 | jnz search_for_empty |
||
2740 | |||
2741 | call write_cache ; no empty slots found, write all |
||
74 | mario79 | 2742 | cmp [hd_error],0 |
2743 | jne found_slot_access_denied |
||
2744 | |||
1 | ha | 2745 | jmp search_again ; and start again |
2746 | |||
2747 | found_slot: |
||
2748 | |||
2749 | mov [cache_search_start],edi |
||
74 | mario79 | 2750 | found_slot_access_denied: |
1 | ha | 2751 | pop esi ecx |
2752 | ret |
||
2753 | |||
2754 | |||
2755 | save_hd_wait_timeout: |
||
2756 | |||
2757 | push eax |
||
2758 | mov eax,[timer_ticks];[0xfdf0] |
||
2759 | add eax,300 ; 3 sec timeout |
||
2760 | mov [hd_wait_timeout],eax |
||
2761 | pop eax |
||
2762 | ret |
||
2763 | |||
2764 | |||
2765 | check_hd_wait_timeout: |
||
2766 | |||
2767 | push eax |
||
2768 | mov eax,[hd_wait_timeout] |
||
2769 | cmp [timer_ticks], eax ;[0xfdf0],eax |
||
2770 | jg hd_timeout_error |
||
2771 | pop eax |
||
74 | mario79 | 2772 | mov [hd_error],0 |
1 | ha | 2773 | ret |
2774 | |||
2775 | iglobal |
||
2776 | hd_timeout_str db 'K : FS - HD timeout',13,10,0 |
||
2777 | hd_read_str db 'K : FS - HD read error',13,10,0 |
||
2778 | hd_write_str db 'K : FS - HD write error',13,10,0 |
||
74 | mario79 | 2779 | hd_lba_str db 'K : FS - HD LBA error',13,10,0 |
1 | ha | 2780 | endg |
2781 | |||
2782 | hd_timeout_error: |
||
2783 | |||
2784 | call clear_hd_cache |
||
2785 | call clear_application_table_status |
||
2786 | mov esi,hd_timeout_str |
||
2787 | call sys_msg_board_str |
||
74 | mario79 | 2788 | ; jmp $ |
2789 | mov [hd_error],1 |
||
2790 | pop eax |
||
2791 | ret |
||
1 | ha | 2792 | |
2793 | hd_read_error: |
||
2794 | |||
2795 | call clear_hd_cache |
||
2796 | call clear_application_table_status |
||
2797 | mov esi,hd_read_str |
||
2798 | call sys_msg_board_str |
||
74 | mario79 | 2799 | pop edx eax |
2800 | jmp return_01 |
||
2801 | ; jmp $ |
||
1 | ha | 2802 | |
2803 | hd_write_error: |
||
2804 | |||
2805 | call clear_hd_cache |
||
2806 | call clear_application_table_status |
||
2807 | mov esi,hd_write_str |
||
2808 | call sys_msg_board_str |
||
74 | mario79 | 2809 | jmp return_02 |
2810 | ; jmp $ |
||
1 | ha | 2811 | |
74 | mario79 | 2812 | hd_lba_error: |
2813 | call clear_hd_cache |
||
2814 | call clear_application_table_status |
||
2815 | mov esi,hd_lba_str |
||
2816 | call sys_msg_board_str |
||
2817 | jmp LBA_read_ret |
||
1 | ha | 2818 | |
2819 | |||
2820 | wait_for_hd_idle: |
||
2821 | |||
2822 | push eax edx |
||
2823 | |||
2824 | call save_hd_wait_timeout |
||
2825 | |||
2826 | mov edx,[hdbase] |
||
2827 | add edx,0x7 |
||
2828 | |||
2829 | wfhil1: |
||
2830 | |||
2831 | call check_hd_wait_timeout |
||
74 | mario79 | 2832 | cmp [hd_error],0 |
2833 | jne @f |
||
1 | ha | 2834 | |
2835 | in al,dx |
||
2836 | test al,128 |
||
2837 | jnz wfhil1 |
||
74 | mario79 | 2838 | |
2839 | @@: |
||
1 | ha | 2840 | |
2841 | pop edx eax |
||
2842 | ret |
||
2843 | |||
2844 | |||
74 | mario79 | 2845 | |
1 | ha | 2846 | wait_for_sector_buffer: |
2847 | |||
2848 | push eax edx |
||
2849 | |||
2850 | mov edx,[hdbase] |
||
2851 | add edx,0x7 |
||
2852 | |||
2853 | call save_hd_wait_timeout |
||
2854 | |||
2855 | hdwait_sbuf: ; wait for sector buffer to be ready |
||
2856 | |||
2857 | call check_hd_wait_timeout |
||
74 | mario79 | 2858 | cmp [hd_error],0 |
2859 | jne @f |
||
1 | ha | 2860 | |
2861 | in al,dx |
||
2862 | test al,8 |
||
2863 | jz hdwait_sbuf |
||
2864 | |||
2865 | mov [hd_error],0 |
||
2866 | |||
2867 | cmp [hd_setup],1 ; do not mark error for setup request |
||
2868 | je buf_wait_ok |
||
2869 | |||
2870 | test al,1 ; previous command ended up with an error |
||
2871 | jz buf_wait_ok |
||
74 | mario79 | 2872 | @@: |
1 | ha | 2873 | mov [hd_error],1 |
2874 | |||
2875 | buf_wait_ok: |
||
2876 | |||
2877 | pop edx eax |
||
2878 | ret |
||
2879 | |||
2880 | |||
2881 | |||
2882 | read_hd_file: |
||
2883 | ;----------------------------------------------------------------- |
||
2884 | ; |
||
2885 | ; Converting old reading function for hd-application start. |
||
2886 | ; |
||
2887 | ; IN: |
||
2888 | ; |
||
2889 | ; eax - pointer to file (0 = read only first sector of drive: eg 'label') |
||
2890 | ; ebx - file lenght |
||
2891 | ; ecx - start 512 byte block number |
||
2892 | ; edx - number of blocks to read |
||
2893 | ; esi - pointer to return/work area (atleast 20 000 bytes) |
||
2894 | ; |
||
2895 | ; For new read function |
||
2896 | ; |
||
2897 | ; EAX (PAR0) pointer to file-name |
||
2898 | ; ECX (PAR1) pointer to buffer |
||
2899 | ; EBX (PAR2) vt file blocks to read |
||
2900 | ; EDX (PAR3) pointer to path |
||
2901 | ; ESI vt first 512 block to read |
||
2902 | ; EDI if 0 - return root |
||
2903 | ;-------------------------------------------------------------------------- |
||
2904 | |||
2905 | push ecx esi edi |
||
2906 | mov esi,eax |
||
2907 | mov edi,startpath |
||
2908 | mov ecx,250 |
||
2909 | cld |
||
2910 | rep movsb |
||
2911 | pop edi esi ecx |
||
2912 | |||
2913 | mov eax,startpath |
||
2914 | mov [eax+ebx-12],byte 0 |
||
2915 | |||
2916 | push eax ebx ecx edx esi |
||
2917 | |||
2918 | pop ecx ; pointer to buffer |
||
2919 | add ecx,1024 |
||
2920 | pop ebx ; number of blocks to read |
||
2921 | pop esi ; first block to read |
||
2922 | dec esi |
||
2923 | pop eax ; file length |
||
2924 | pop edx ; pointer to path |
||
2925 | |||
2926 | mov edi,12 |
||
2927 | lea eax,[eax+edx-12+1] |
||
2928 | call file_read |
||
2929 | |||
2930 | ret |
||
2931 | |||
71 | diamond | 2932 | ; \begin{diamond} |
2933 | hd_find_lfn: |
||
2934 | ; in: esi->name |
||
2935 | ; out: CF=1 - file not found |
||
2936 | ; else CF=0 and edi->direntry |
||
75 | diamond | 2937 | pusha |
2938 | sub esp, 262*2 ; allocate space for LFN |
||
2939 | mov ebp, esp |
||
2940 | push 0 ; for fat_get_name: read ASCII name |
||
74 | mario79 | 2941 | mov eax, [ROOT_CLUSTER] ; start from root |
71 | diamond | 2942 | .mainloop: |
2943 | .new_cluster: |
||
74 | mario79 | 2944 | mov [cluster_tmp], eax |
2945 | mov [fat16_root], 0 |
||
2946 | cmp eax, [LAST_CLUSTER] |
||
2947 | ja .notfound |
||
2948 | cmp eax, 2 |
||
2949 | jae .data_cluster |
||
2950 | cmp [fat_type], 16 |
||
2951 | jnz .notfound |
||
2952 | mov eax, [ROOT_START] |
||
2953 | mov ecx, [ROOT_SECTORS] |
||
2954 | mov [fat16_root], 1 |
||
2955 | jmp .new_sector |
||
71 | diamond | 2956 | .data_cluster: |
74 | mario79 | 2957 | dec eax |
2958 | dec eax |
||
2959 | mov ecx, [SECTORS_PER_CLUSTER] |
||
2960 | mul ecx |
||
2961 | add eax, [DATA_START] |
||
71 | diamond | 2962 | .new_sector: |
74 | mario79 | 2963 | mov ebx, buffer |
2964 | call hd_read |
||
2965 | cmp [hd_error],0 |
||
2966 | jne .notfound |
||
2967 | |||
2968 | mov edi, ebx |
||
2969 | add ebx, 512 |
||
2970 | push eax |
||
71 | diamond | 2971 | .l1: |
74 | mario79 | 2972 | call fat_get_name |
2973 | jc .l2 |
||
2974 | call fat_compare_name |
||
2975 | jz .found |
||
71 | diamond | 2976 | .l2: |
74 | mario79 | 2977 | add edi, 0x20 |
2978 | cmp edi, ebx |
||
2979 | jb .l1 |
||
2980 | pop eax |
||
2981 | inc eax |
||
2982 | loop .new_sector |
||
2983 | cmp [fat16_root], 0 |
||
2984 | jnz .notfound |
||
2985 | mov eax, [cluster_tmp] |
||
2986 | call get_FAT |
||
2987 | cmp [hd_error],0 |
||
2988 | jne .notfound |
||
2989 | |||
2990 | cmp eax, 2 |
||
2991 | jb .notfound |
||
2992 | cmp eax, [fatRESERVED] |
||
2993 | jb .new_cluster |
||
71 | diamond | 2994 | .notfound: |
75 | diamond | 2995 | add esp, 262*2+4 |
74 | mario79 | 2996 | popa |
2997 | stc |
||
2998 | ret |
||
71 | diamond | 2999 | .found: |
74 | mario79 | 3000 | pop eax |
71 | diamond | 3001 | ; if this is LFN entry, advance to true entry |
74 | mario79 | 3002 | cmp byte [edi+11], 0xF |
3003 | jnz .entryfound |
||
3004 | add edi, 0x20 |
||
3005 | cmp edi, ebx |
||
3006 | jb .entryfound |
||
3007 | inc eax |
||
3008 | dec ecx |
||
3009 | jnz .read_entry |
||
3010 | cmp [fat16_root], 0 |
||
3011 | jnz .notfound |
||
3012 | mov eax, [cluster_tmp] |
||
3013 | call get_FAT |
||
3014 | cmp [hd_error],0 |
||
3015 | jne .notfound |
||
3016 | |||
3017 | cmp eax, 2 |
||
3018 | jb .notfound |
||
3019 | cmp eax, [fatRESERVED] |
||
3020 | jae .notfound |
||
3021 | dec eax |
||
3022 | dec eax |
||
3023 | mul [SECTORS_PER_CLUSTER] |
||
3024 | add eax, [DATA_START] |
||
71 | diamond | 3025 | .read_entry: |
74 | mario79 | 3026 | mov ebx, [buffer] |
3027 | call hd_read |
||
3028 | cmp [hd_error],0 |
||
3029 | jne .notfound |
||
3030 | |||
3031 | mov edi, ebx |
||
71 | diamond | 3032 | .entryfound: |
74 | mario79 | 3033 | cmp byte [esi], 0 |
3034 | jz .done |
||
3035 | test byte [edi+11], 10h ; is a directory? |
||
3036 | jz .notfound |
||
3037 | mov eax, [edi+20-2] |
||
3038 | mov ax, [edi+26] |
||
3039 | jmp .mainloop |
||
71 | diamond | 3040 | .done: |
75 | diamond | 3041 | add esp, 262*2+4+4 ; CF=0 |
74 | mario79 | 3042 | push edi |
3043 | popad |
||
3044 | ret |
||
71 | diamond | 3045 | |
3046 | ;---------------------------------------------------------------- |
||
3047 | ; |
||
3048 | ; fs_HdRead - LFN variant for reading hard disk |
||
3049 | ; |
||
3050 | ; esi points to filename |
||
3051 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
||
3052 | ; may be ebx=0 - start from first byte |
||
3053 | ; ecx number of bytes to read, 0+ |
||
3054 | ; edx mem location to return data |
||
3055 | ; |
||
77 | diamond | 3056 | ; ret ebx = bytes read or 0xffffffff file not found |
71 | diamond | 3057 | ; eax = 0 ok read or other = errormsg |
3058 | ; |
||
3059 | ;-------------------------------------------------------------- |
||
3060 | fs_HdRead: |
||
74 | mario79 | 3061 | cmp [fat_type], 0 |
3062 | jnz @f |
||
3063 | or ebx, -1 |
||
3064 | mov eax, ERROR_UNKNOWN_FS |
||
3065 | ret |
||
71 | diamond | 3066 | @@: |
74 | mario79 | 3067 | push edi |
3068 | cmp byte [esi], 0 |
||
3069 | jnz @f |
||
71 | diamond | 3070 | .noaccess: |
74 | mario79 | 3071 | pop edi |
3072 | .noaccess_2: |
||
3073 | or ebx, -1 |
||
3074 | mov eax, ERROR_ACCESS_DENIED |
||
3075 | ret |
||
3076 | |||
3077 | .noaccess_3: |
||
3078 | add esp,4 |
||
3079 | .noaccess_1: |
||
3080 | add esp,4 |
||
3081 | .noaccess_4: |
||
3082 | add esp,4*5 |
||
3083 | jmp .noaccess_2 |
||
3084 | |||
71 | diamond | 3085 | @@: |
74 | mario79 | 3086 | call hd_find_lfn |
3087 | jnc .found |
||
3088 | pop edi |
||
3089 | cmp [hd_error],0 |
||
3090 | jne .noaccess_2 |
||
3091 | or ebx, -1 |
||
3092 | mov eax, ERROR_FILE_NOT_FOUND |
||
3093 | ret |
||
3094 | |||
71 | diamond | 3095 | .found: |
74 | mario79 | 3096 | test byte [edi+11], 0x10 ; do not allow read directories |
3097 | jnz .noaccess |
||
3098 | test ebx, ebx |
||
3099 | jz .l1 |
||
3100 | cmp dword [ebx+4], 0 |
||
3101 | jz @f |
||
77 | diamond | 3102 | xor ebx, ebx |
71 | diamond | 3103 | .reteof: |
74 | mario79 | 3104 | mov eax, 6 |
3105 | pop edi |
||
3106 | ret |
||
71 | diamond | 3107 | @@: |
74 | mario79 | 3108 | mov ebx, [ebx] |
71 | diamond | 3109 | .l1: |
77 | diamond | 3110 | push ecx edx |
3111 | push 0 |
||
3112 | mov eax, [edi+28] |
||
3113 | sub eax, ebx |
||
3114 | jb .eof |
||
3115 | cmp eax, ecx |
||
3116 | jae @f |
||
3117 | mov ecx, eax |
||
3118 | mov byte [esp], 6 |
||
3119 | @@: |
||
74 | mario79 | 3120 | mov eax, [edi+20-2] |
3121 | mov ax, [edi+26] |
||
71 | diamond | 3122 | ; now eax=cluster, ebx=position, ecx=count, edx=buffer for data |
3123 | .new_cluster: |
||
74 | mario79 | 3124 | jecxz .new_sector |
3125 | test eax, eax |
||
3126 | jz .eof |
||
3127 | cmp eax, [fatRESERVED] |
||
3128 | jae .eof |
||
3129 | mov [cluster_tmp], eax |
||
3130 | dec eax |
||
3131 | dec eax |
||
3132 | mov edi, [SECTORS_PER_CLUSTER] |
||
3133 | imul eax, edi |
||
3134 | add eax, [DATA_START] |
||
71 | diamond | 3135 | .new_sector: |
74 | mario79 | 3136 | test ecx, ecx |
3137 | jz .done |
||
3138 | sub ebx, 512 |
||
3139 | jae .skip |
||
3140 | add ebx, 512 |
||
3141 | jnz .force_buf |
||
3142 | cmp ecx, 512 |
||
3143 | jb .force_buf |
||
71 | diamond | 3144 | ; we may read directly to given buffer |
74 | mario79 | 3145 | push ebx |
3146 | mov ebx, edx |
||
3147 | call hd_read |
||
3148 | cmp [hd_error],0 |
||
3149 | jne .noaccess_1 |
||
3150 | pop ebx |
||
3151 | add edx, 512 |
||
3152 | sub ecx, 512 |
||
3153 | jmp .skip |
||
71 | diamond | 3154 | .force_buf: |
3155 | ; we must read sector to temporary buffer and then copy it to destination |
||
74 | mario79 | 3156 | push eax ebx |
3157 | mov ebx, buffer |
||
3158 | call hd_read |
||
3159 | cmp [hd_error],0 |
||
3160 | jne .noaccess_3 |
||
3161 | |||
3162 | mov eax, ebx |
||
3163 | pop ebx |
||
3164 | add eax, ebx |
||
3165 | push ecx |
||
3166 | add ecx, ebx |
||
3167 | cmp ecx, 512 |
||
3168 | jbe @f |
||
3169 | mov ecx, 512 |
||
71 | diamond | 3170 | @@: |
74 | mario79 | 3171 | sub ecx, ebx |
3172 | mov ebx, edx |
||
3173 | call memmove |
||
3174 | add edx, ecx |
||
3175 | sub [esp], ecx |
||
3176 | pop ecx |
||
3177 | pop eax |
||
3178 | xor ebx, ebx |
||
71 | diamond | 3179 | .skip: |
74 | mario79 | 3180 | inc eax |
3181 | dec edi |
||
3182 | jnz .new_sector |
||
3183 | mov eax, [cluster_tmp] |
||
3184 | call get_FAT |
||
3185 | cmp [hd_error],0 |
||
3186 | jne .noaccess_4 |
||
3187 | |||
3188 | jmp .new_cluster |
||
71 | diamond | 3189 | .done: |
77 | diamond | 3190 | mov ebx, edx |
3191 | pop eax edx ecx edi |
||
3192 | sub ebx, edx |
||
3193 | ret |
||
71 | diamond | 3194 | .eof: |
77 | diamond | 3195 | mov ebx, edx |
3196 | pop eax edx ecx |
||
3197 | sub ebx, edx |
||
3198 | jmp .reteof |
||
75 | diamond | 3199 | |
3200 | ;---------------------------------------------------------------- |
||
3201 | ; |
||
3202 | ; fs_HdReadFolder - LFN variant for reading hard disk folder |
||
3203 | ; |
||
3204 | ; esi points to filename |
||
78 | diamond | 3205 | ; ebx pointer to structure 32-bit number = first wanted block, 0+ |
3206 | ; & flags (bitfields) |
||
3207 | ; flags: bit 0: 0=ANSI names, 1=UNICODE names |
||
75 | diamond | 3208 | ; ecx number of blocks to read, 0+ |
3209 | ; edx mem location to return data |
||
3210 | ; |
||
77 | diamond | 3211 | ; ret ebx = blocks read or 0xffffffff folder not found |
75 | diamond | 3212 | ; eax = 0 ok read or other = errormsg |
3213 | ; |
||
3214 | ;-------------------------------------------------------------- |
||
3215 | fs_HdReadFolder: |
||
3216 | mov eax, [ROOT_CLUSTER] |
||
3217 | push edi |
||
3218 | cmp byte [esi], 0 |
||
3219 | jz .doit |
||
3220 | call hd_find_lfn |
||
3221 | jnc .found |
||
3222 | pop edi |
||
3223 | or ebx, -1 |
||
3224 | mov eax, ERROR_FILE_NOT_FOUND |
||
3225 | ret |
||
3226 | .found: |
||
3227 | test byte [edi+11], 0x10 ; do not allow read files |
||
3228 | jnz .found_dir |
||
3229 | pop edi |
||
3230 | or ebx, -1 |
||
3231 | mov eax, ERROR_ACCESS_DENIED |
||
3232 | ret |
||
3233 | .found_dir: |
||
3234 | mov eax, [edi+20-2] |
||
3235 | mov ax, [edi+26] ; eax=cluster |
||
3236 | .doit: |
||
3237 | push esi ecx |
||
3238 | push ebp |
||
3239 | sub esp, 262*2 ; reserve space for LFN |
||
3240 | mov ebp, esp |
||
78 | diamond | 3241 | push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE name |
3242 | mov ebx, [ebx] |
||
75 | diamond | 3243 | ; init header |
3244 | push eax ecx |
||
3245 | mov edi, edx |
||
3246 | mov ecx, 32/4 |
||
3247 | xor eax, eax |
||
3248 | rep stosd |
||
3249 | pop ecx eax |
||
3250 | mov byte [edx], 1 ; version |
||
3251 | mov esi, edi ; esi points to BDFE |
||
3252 | .new_cluster: |
||
3253 | mov [cluster_tmp], eax |
||
3254 | test eax, eax |
||
3255 | jnz @f |
||
3256 | cmp [fat_type], 32 |
||
3257 | jz .notfound |
||
3258 | mov eax, [ROOT_START] |
||
3259 | push [ROOT_SECTORS] |
||
3260 | push ebx |
||
3261 | jmp .new_sector |
||
3262 | @@: |
||
3263 | dec eax |
||
3264 | dec eax |
||
3265 | imul eax, [SECTORS_PER_CLUSTER] |
||
3266 | push [SECTORS_PER_CLUSTER] |
||
3267 | add eax, [DATA_START] |
||
3268 | push ebx |
||
3269 | .new_sector: |
||
3270 | mov ebx, buffer |
||
3271 | mov edi, ebx |
||
3272 | call hd_read |
||
3273 | cmp [hd_error], 0 |
||
3274 | jnz .notfound2 |
||
3275 | add ebx, 512 |
||
3276 | push eax |
||
3277 | .l1: |
||
3278 | call fat_get_name |
||
3279 | jc .l2 |
||
3280 | cmp byte [edi+11], 0xF |
||
3281 | jnz .do_bdfe |
||
3282 | add edi, 0x20 |
||
3283 | cmp edi, ebx |
||
3284 | jb .do_bdfe |
||
3285 | pop eax |
||
3286 | inc eax |
||
3287 | dec dword [esp+4] |
||
3288 | jnz @f |
||
3289 | mov eax, [cluster_tmp] |
||
3290 | test eax, eax |
||
3291 | jz .done |
||
3292 | call get_FAT |
||
3293 | cmp [hd_error], 0 |
||
3294 | jnz .notfound2 |
||
3295 | cmp eax, 2 |
||
3296 | jb .done |
||
3297 | cmp eax, [fatRESERVED] |
||
3298 | jae .done |
||
3299 | push eax |
||
3300 | mov eax, [SECTORS_PER_CLUSTER] |
||
3301 | mov [esp+8], eax |
||
3302 | pop eax |
||
3303 | mov [cluster_tmp], eax |
||
3304 | dec eax |
||
3305 | dec eax |
||
3306 | imul eax, [SECTORS_PER_CLUSTER] |
||
3307 | add eax, [DATA_START] |
||
3308 | @@: |
||
3309 | mov ebx, buffer |
||
3310 | mov edi, ebx |
||
3311 | call hd_read |
||
3312 | cmp [hd_error], 0 |
||
3313 | jnz .notfound2 |
||
3314 | add ebx, 512 |
||
3315 | push eax |
||
3316 | .do_bdfe: |
||
3317 | inc dword [edx+8] ; new file found |
||
3318 | dec dword [esp+4] |
||
3319 | jns .l2 |
||
3320 | dec ecx |
||
3321 | js .l2 |
||
3322 | inc dword [edx+4] ; new file block copied |
||
3323 | call fat_entry_to_bdfe |
||
3324 | .l2: |
||
3325 | add edi, 0x20 |
||
3326 | cmp edi, ebx |
||
3327 | jb .l1 |
||
3328 | pop eax |
||
3329 | inc eax |
||
3330 | dec dword [esp+4] |
||
3331 | jnz .new_sector |
||
3332 | mov eax, [cluster_tmp] |
||
3333 | test eax, eax |
||
3334 | jz .done |
||
3335 | call get_FAT |
||
3336 | cmp [hd_error], 0 |
||
3337 | jnz .notfound2 |
||
3338 | cmp eax, 2 |
||
3339 | jb .done |
||
3340 | cmp eax, [fatRESERVED] |
||
3341 | jae .done |
||
3342 | push eax |
||
3343 | mov eax, [SECTORS_PER_CLUSTER] |
||
3344 | mov [esp+8], eax |
||
3345 | pop eax |
||
3346 | pop ebx |
||
3347 | add esp, 4 |
||
3348 | jmp .new_cluster |
||
3349 | .notfound2: |
||
3350 | add esp, 8 |
||
3351 | .notfound: |
||
3352 | add esp, 262*2+4 |
||
3353 | pop ebp ecx esi edi |
||
3354 | mov eax, ERROR_FILE_NOT_FOUND |
||
3355 | or ebx, -1 |
||
3356 | ret |
||
3357 | .done: |
||
3358 | add esp, 262*2+4+8 |
||
3359 | pop ebp |
||
77 | diamond | 3360 | mov ebx, [edx+4] |
75 | diamond | 3361 | xor eax, eax |
3362 | dec ecx |
||
3363 | js @f |
||
3364 | mov al, ERROR_END_OF_FILE |
||
3365 | @@: |
||
3366 | pop ecx esi edi |
||
3367 | ret |
||
3368 | |||
74 | mario79 | 3369 | ; \end{diamond}>>>> |