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1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
2 | ;; ;; |
3 | ;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;; |
3 | ;; Copyright (C) KolibriOS team 2013. All rights reserved. ;; |
4 | ;; Distributed under terms of the GNU General Public License ;; |
4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
5 | ;; ;; |
6 | ;; RAMDISK functions ;; |
6 | ;; RAMDISK functions ;; |
7 | ;; (C) 2004 Ville Turjanmaa, License: GPL ;; |
- | |
8 | ;; Addings by M.Lisovin ;; |
- | |
9 | ;; LFN support by diamond ;; |
- | |
10 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
7 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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11 | 8 | ||
Line 12... | Line -... | ||
12 | $Revision: 3626 $ |
- | |
13 | - | ||
14 | - | ||
15 | ; calculate fat chain |
- | |
16 | - | ||
17 | calculatefatchain: |
- | |
18 | - | ||
19 | pushad |
- | |
20 | - | ||
21 | mov esi, RAMDISK+512 |
- | |
22 | mov edi, RAMDISK_FAT |
9 | $Revision: 4287 $ |
23 | - | ||
24 | fcnew: |
- | |
25 | mov eax, dword [esi] |
- | |
26 | mov ebx, dword [esi+4] |
- | |
27 | mov ecx, dword [esi+8] |
- | |
28 | mov edx, ecx |
- | |
29 | shr edx, 4;8 ok |
- | |
30 | shr dx, 4;7 ok |
- | |
31 | xor ch, ch |
- | |
32 | shld ecx, ebx, 20;6 ok |
- | |
33 | shr cx, 4;5 ok |
- | |
34 | shld ebx, eax, 12 |
- | |
35 | and ebx, 0x0fffffff;4 ok |
- | |
36 | shr bx, 4;3 ok |
- | |
37 | shl eax, 4 |
- | |
38 | and eax, 0x0fffffff;2 ok |
- | |
39 | shr ax, 4;1 ok |
- | |
40 | mov dword [edi], eax |
- | |
41 | mov dword [edi+4], ebx |
- | |
42 | mov dword [edi+8], ecx |
- | |
43 | mov dword [edi+12], edx |
- | |
44 | add edi, 16 |
- | |
45 | add esi, 12 |
- | |
46 | - | ||
47 | cmp edi, RAMDISK_FAT+2856*2;2849 clusters |
- | |
48 | jnz fcnew |
- | |
49 | - | ||
50 | popad |
- | |
51 | ret |
- | |
52 | - | ||
53 | - | ||
54 | restorefatchain: ; restore fat chain |
- | |
55 | - | ||
56 | pushad |
- | |
57 | - | ||
58 | mov esi, RAMDISK_FAT |
- | |
59 | mov edi, RAMDISK+512 |
10 | |
60 | - | ||
61 | fcnew2: |
- | |
62 | mov eax, dword [esi] |
- | |
63 | mov ebx, dword [esi+4] |
- | |
64 | shl ax, 4 |
- | |
65 | shl eax, 4 |
- | |
66 | shl bx, 4 |
- | |
67 | shr ebx, 4 |
- | |
68 | shrd eax, ebx, 8 |
- | |
69 | shr ebx, 8 |
- | |
70 | mov dword [edi], eax |
- | |
71 | mov word [edi+4], bx |
- | |
72 | add edi, 6 |
- | |
73 | add esi, 8 |
- | |
74 | - | ||
75 | cmp edi, RAMDISK+512+4278;4274 bytes - all used FAT |
- | |
76 | jb fcnew2 |
- | |
77 | - | ||
78 | mov esi, RAMDISK+512 ; duplicate fat chain |
- | |
79 | mov edi, RAMDISK+512+0x1200 |
- | |
80 | mov ecx, 1069;4274/4 |
- | |
81 | cld |
- | |
82 | rep movsd |
- | |
83 | - | ||
84 | popad |
- | |
85 | ret |
- | |
86 | 11 | iglobal |
|
87 | - | ||
88 | ramdisk_free_space: |
- | |
89 | ;--------------------------------------------- |
- | |
90 | ; |
- | |
91 | ; returns free space in edi |
- | |
92 | ; rewr.by Mihasik |
- | |
93 | ;--------------------------------------------- |
- | |
94 | - | ||
95 | push eax ebx ecx |
- | |
96 | - | ||
97 | mov edi, RAMDISK_FAT;start of FAT |
- | |
98 | xor ax, ax;Free cluster=0x0000 in FAT |
- | |
99 | xor ebx, ebx;counter |
- | |
100 | mov ecx, 2849;2849 clusters |
- | |
101 | cld |
- | |
102 | rdfs1: |
- | |
103 | repne scasw |
- | |
104 | jnz rdfs2 ;if last cluster not 0 |
- | |
105 | inc ebx |
- | |
106 | test ecx, ecx |
- | |
107 | jnz rdfs1 |
- | |
108 | rdfs2: |
- | |
109 | shl ebx, 9;free clusters*512 |
- | |
110 | mov edi, ebx |
- | |
111 | - | ||
112 | pop ecx ebx eax |
- | |
113 | ret |
- | |
114 | - | ||
115 | - | ||
116 | expand_filename: |
- | |
117 | ;--------------------------------------------- |
- | |
118 | ; |
- | |
119 | ; exapand filename with '.' to 11 character |
- | |
120 | ; eax - pointer to filename |
- | |
121 | ;--------------------------------------------- |
- | |
122 | - | ||
123 | push esi edi ebx |
- | |
124 | - | ||
125 | mov edi, esp ; check for '.' in the name |
- | |
126 | add edi, 12+8 |
- | |
127 | - | ||
128 | mov esi, eax |
- | |
129 | - | ||
130 | mov eax, edi |
- | |
131 | mov [eax+0], dword ' ' |
- | |
132 | mov [eax+4], dword ' ' |
- | |
133 | mov [eax+8], dword ' ' |
- | |
134 | - | ||
135 | flr1: |
- | |
136 | - | ||
137 | cmp [esi], byte '.' |
- | |
138 | jne flr2 |
- | |
139 | mov edi, eax |
- | |
140 | add edi, 7 |
- | |
141 | jmp flr3 |
- | |
142 | - | ||
143 | flr2: |
- | |
144 | - | ||
145 | mov bl, [esi] |
- | |
146 | mov [edi], bl |
- | |
147 | - | ||
148 | flr3: |
12 | align 4 |
149 | - | ||
150 | inc esi |
- | |
151 | inc edi |
- | |
152 | - | ||
153 | mov ebx, eax |
- | |
154 | add ebx, 11 |
- | |
155 | - | ||
156 | cmp edi, ebx |
- | |
157 | jbe flr1 |
- | |
158 | - | ||
159 | pop ebx edi esi |
- | |
160 | ret |
- | |
161 | - | ||
162 | fileread: |
- | |
163 | ;---------------------------------------------------------------- |
- | |
164 | ; |
- | |
165 | ; fileread - sys floppy |
- | |
166 | ; |
- | |
167 | ; eax points to filename 11 chars |
- | |
168 | ; ebx first wanted block ; 1+ ; if 0 then set to 1 |
- | |
169 | ; ecx number of blocks to read ; 1+ ; if 0 then set to 1 |
- | |
170 | ; edx mem location to return data |
- | |
171 | ; esi length of filename 12*X 0=root |
- | |
172 | ; |
- | |
173 | ; ret ebx = size or 0xffffffff file not found |
- | |
174 | ; eax = 0 ok read or other = errormsg |
- | |
175 | ; |
- | |
176 | ;-------------------------------------------------------------- |
- | |
177 | test ebx, ebx;if ebx=0 - set to 1 |
- | |
178 | jnz frfl5 |
- | |
179 | inc ebx |
- | |
180 | frfl5: |
- | |
181 | test ecx, ecx;if ecx=0 - set to 1 |
- | |
182 | jnz frfl6 |
- | |
183 | inc ecx |
- | |
184 | frfl6: |
- | |
185 | test esi, esi ; return ramdisk root |
- | |
186 | jnz fr_noroot ;if not root |
- | |
187 | cmp ebx, 14 ;14 clusters=root dir |
- | |
188 | ja oorr |
- | |
189 | cmp ecx, 14 |
- | |
190 | ja oorr |
- | |
191 | jmp fr_do |
- | |
192 | oorr: |
- | |
193 | mov eax, 5 ;out of root range (fnf) |
13 | ramdisk_functions: |
194 | xor ebx, ebx |
- | |
195 | dec ebx ;0xffffffff |
- | |
196 | ret |
14 | dd .size |
197 | - | ||
198 | fr_do: ;reading rootdir |
- | |
199 | mov edi, edx |
- | |
200 | dec ebx |
- | |
201 | push edx |
- | |
202 | mov edx, ecx |
- | |
203 | add edx, ebx |
- | |
204 | cmp edx, 15 ;ebx+ecx=14+1 |
- | |
205 | pushf |
- | |
206 | jbe fr_do1 |
- | |
207 | sub edx, 14 |
- | |
208 | sub ecx, edx |
- | |
209 | fr_do1: |
- | |
210 | shl ebx, 9 |
- | |
211 | mov esi, RAMDISK+512*19 |
- | |
212 | add esi, ebx |
- | |
213 | shl ecx, 7 |
- | |
214 | cld |
- | |
215 | rep movsd |
- | |
216 | popf |
- | |
217 | pop edx |
- | |
218 | jae fr_do2 |
- | |
219 | xor eax, eax; ok read |
- | |
220 | xor ebx, ebx |
- | |
221 | ret |
- | |
222 | fr_do2: ;if last cluster |
- | |
223 | mov eax, 6;end of file |
- | |
224 | xor ebx, ebx |
- | |
225 | ret |
- | |
226 | - | ||
227 | fr_noroot: |
- | |
228 | - | ||
229 | sub esp, 32 |
- | |
230 | call expand_filename |
- | |
231 | - | ||
232 | dec ebx |
- | |
233 | - | ||
234 | push eax |
- | |
235 | - | ||
236 | push eax ebx ecx edx esi edi |
- | |
237 | call rd_findfile |
- | |
238 | je fifound |
- | |
239 | add esp, 32+28 ;if file not found |
- | |
240 | ret |
- | |
241 | - | ||
242 | fifound: |
- | |
243 | - | ||
244 | mov ebx, [edi-11+28] ;file size |
- | |
245 | mov [esp+20], ebx |
- | |
246 | mov [esp+24], ebx |
- | |
247 | add edi, 0xf |
- | |
248 | movzx eax, word [edi] |
- | |
249 | mov edi, eax ;edi=cluster |
- | |
250 | - | ||
251 | frnew: |
- | |
252 | - | ||
253 | add eax, 31 ;bootsector+2*fat+filenames |
- | |
254 | shl eax, 9 ;*512 |
- | |
255 | add eax, RAMDISK ;image base |
- | |
256 | mov ebx, [esp+8] |
- | |
257 | mov ecx, 512 ;[esp+4] |
- | |
258 | - | ||
259 | cmp [esp+16], dword 0 ; wanted cluster ? |
- | |
260 | jne frfl7 |
15 | dd 0 ; no close() function |
261 | call memmove |
- | |
262 | add [esp+8], dword 512 |
- | |
263 | dec dword [esp+12] ; last wanted cluster ? |
- | |
264 | je frnoread |
- | |
265 | jmp frfl8 |
- | |
266 | frfl7: |
- | |
267 | dec dword [esp+16] |
- | |
268 | frfl8: |
- | |
269 | movzx eax, word [edi*2+RAMDISK_FAT] ; find next cluster from FAT |
- | |
270 | mov edi, eax |
- | |
271 | cmp edi, 4095 ;eof - cluster |
- | |
272 | jz frnoread2 |
- | |
273 | - | ||
274 | cmp [esp+24], dword 512 ;eof - size |
- | |
275 | jb frnoread |
- | |
276 | sub [esp+24], dword 512 |
- | |
277 | - | ||
278 | jmp frnew |
- | |
279 | - | ||
280 | frnoread2: |
- | |
281 | 16 | dd 0 ; no closemedia() function |
|
282 | cmp [esp+16], dword 0 ; eof without read ? |
- | |
283 | je frnoread |
- | |
284 | - | ||
285 | pop edi esi edx ecx |
- | |
286 | add esp, 4 |
- | |
287 | pop ebx ; ebx <- eax : size of file |
- | |
288 | add esp, 36 |
- | |
289 | mov eax, 6 ; end of file |
- | |
290 | ret |
- | |
291 | - | ||
292 | frnoread: |
- | |
293 | - | ||
294 | pop edi esi edx ecx |
- | |
295 | add esp, 4 |
- | |
296 | pop ebx ; ebx <- eax : size of file |
- | |
297 | add esp, 36 |
- | |
298 | xor eax, eax;read ok |
- | |
299 | ret |
- | |
300 | - | ||
301 | - | ||
302 | - | ||
303 | rd_findfile: |
- | |
304 | ;by Mihasik |
- | |
305 | ;IN: eax - pointer to filename OUT: filestring+11 in edi or notZero in flags and fnf in eax,ebx |
- | |
306 | - | ||
307 | mov edi, RAMDISK+512*18+512;Point at directory |
- | |
308 | cld |
- | |
309 | rd_newsearch: |
- | |
310 | mov esi, eax |
- | |
311 | mov ecx, 11 |
- | |
312 | rep cmpsb |
- | |
313 | je rd_ff |
- | |
314 | add cl, 21 |
- | |
315 | add edi, ecx |
17 | dd ramdisk_querymedia |
316 | cmp edi, RAMDISK+512*33 |
- | |
317 | jb rd_newsearch |
- | |
318 | mov eax, 5 ;if file not found - eax=5 |
- | |
319 | xor ebx, ebx |
- | |
320 | dec ebx ;ebx=0xffffffff and zf=0 |
- | |
321 | rd_ff: |
- | |
322 | ret |
- | |
323 | - | ||
324 | ; \begin{diamond} |
- | |
325 | - | ||
326 | uni2ansi_str: |
- | |
327 | ; convert UNICODE zero-terminated string to ASCII-string (codepage 866) |
- | |
328 | ; in: esi->source, edi->buffer (may be esi=edi) |
- | |
329 | ; destroys: eax,esi,edi |
- | |
330 | lodsw |
- | |
331 | test ax, ax |
- | |
332 | jz .done |
- | |
333 | cmp ax, 0x80 |
- | |
334 | jb .ascii |
- | |
335 | cmp ax, 0x401 |
- | |
336 | jz .yo1 |
- | |
337 | cmp ax, 0x451 |
- | |
338 | jz .yo2 |
- | |
339 | cmp ax, 0x410 |
- | |
340 | jb .unk |
- | |
341 | cmp ax, 0x440 |
- | |
342 | jb .rus1 |
- | |
343 | cmp ax, 0x450 |
- | |
344 | jb .rus2 |
- | |
345 | .unk: |
- | |
346 | mov al, '_' |
- | |
347 | jmp .doit |
- | |
348 | .yo1: |
- | |
349 | mov al, 0xF0 ; 'Ё' |
- | |
350 | jmp .doit |
- | |
351 | .yo2: |
- | |
352 | mov al, 0xF1 ; 'ё' |
- | |
353 | jmp .doit |
- | |
354 | .rus1: |
- | |
355 | ; 0x410-0x43F -> 0x80-0xAF |
- | |
356 | add al, 0x70 |
- | |
357 | jmp .doit |
- | |
358 | .rus2: |
- | |
359 | ; 0x440-0x44F -> 0xE0-0xEF |
- | |
360 | add al, 0xA0 |
- | |
361 | .ascii: |
- | |
362 | .doit: |
- | |
363 | stosb |
- | |
364 | jmp uni2ansi_str |
- | |
365 | .done: |
- | |
366 | mov byte [edi], 0 |
- | |
367 | ret |
- | |
368 | - | ||
369 | ansi2uni_char: |
- | |
370 | ; convert ANSI character in al to UNICODE character in ax, using cp866 encoding |
- | |
371 | mov ah, 0 |
- | |
372 | ; 0x00-0x7F - trivial map |
- | |
373 | cmp al, 0x80 |
- | |
374 | jb .ret |
- | |
375 | ; 0x80-0xAF -> 0x410-0x43F |
- | |
376 | cmp al, 0xB0 |
- | |
377 | jae @f |
- | |
378 | add ax, 0x410-0x80 |
- | |
379 | .ret: |
- | |
380 | ret |
- | |
381 | @@: |
- | |
382 | ; 0xE0-0xEF -> 0x440-0x44F |
- | |
383 | cmp al, 0xE0 |
- | |
384 | jb .unk |
- | |
385 | cmp al, 0xF0 |
- | |
386 | jae @f |
- | |
387 | add ax, 0x440-0xE0 |
- | |
388 | ret |
- | |
389 | ; 0xF0 -> 0x401 |
- | |
390 | ; 0xF1 -> 0x451 |
- | |
391 | @@: |
- | |
392 | cmp al, 0xF0 ; 'Ё' |
- | |
393 | jz .yo1 |
- | |
394 | cmp al, 0xF1 ; 'ё' |
- | |
395 | jz .yo2 |
- | |
396 | .unk: |
- | |
397 | mov al, '_' ; ah=0 |
- | |
398 | ret |
- | |
399 | .yo1: |
- | |
400 | mov ax, 0x401 |
- | |
401 | ret |
- | |
402 | .yo2: |
- | |
403 | mov ax, 0x451 |
- | |
404 | ret |
- | |
405 | - | ||
406 | char_toupper: |
- | |
407 | ; convert character to uppercase, using cp866 encoding |
- | |
408 | ; in: al=symbol |
- | |
409 | ; out: al=converted symbol |
- | |
410 | cmp al, 'a' |
- | |
411 | jb .ret |
- | |
412 | cmp al, 'z' |
- | |
413 | jbe .az |
- | |
414 | cmp al, 0xF1 ; 'ё' |
- | |
415 | jz .yo1 |
- | |
416 | cmp al, 0xA0 ; 'а' |
- | |
417 | jb .ret |
- | |
418 | cmp al, 0xE0 ; 'р' |
- | |
419 | jb .rus1 |
- | |
420 | cmp al, 0xEF ; 'я' |
- | |
421 | ja .ret |
- | |
422 | ; 0xE0-0xEF -> 0x90-0x9F |
- | |
423 | sub al, 0xE0-0x90 |
- | |
424 | .ret: |
- | |
425 | ret |
- | |
426 | .rus1: |
- | |
427 | ; 0xA0-0xAF -> 0x80-0x8F |
- | |
428 | .az: |
- | |
429 | and al, not 0x20 |
- | |
430 | ret |
- | |
431 | .yo1: |
- | |
432 | ; 0xF1 -> 0xF0 |
- | |
433 | dec ax |
- | |
434 | ret |
- | |
435 | - | ||
436 | fat_get_name: |
- | |
437 | ; in: edi->FAT entry |
- | |
438 | ; out: CF=1 - no valid entry |
- | |
439 | ; else CF=0 and ebp->ASCIIZ-name |
- | |
440 | ; (maximum length of filename is 255 (wide) symbols without trailing 0, |
- | |
441 | ; but implementation requires buffer 261 words) |
- | |
442 | ; destroys eax |
- | |
443 | cmp byte [edi], 0 |
- | |
444 | jz .no |
- | |
445 | cmp byte [edi], 0xE5 |
- | |
446 | jnz @f |
- | |
447 | .no: |
- | |
448 | stc |
- | |
449 | ret |
- | |
450 | @@: |
- | |
451 | cmp byte [edi+11], 0xF |
- | |
452 | jz .longname |
- | |
453 | test byte [edi+11], 8 |
- | |
454 | jnz .no |
- | |
455 | push ecx |
- | |
456 | push edi ebp |
- | |
457 | test byte [ebp-4], 1 |
- | |
458 | jnz .unicode_short |
- | |
459 | - | ||
460 | mov eax, [edi] |
- | |
461 | mov ecx, [edi+4] |
- | |
462 | mov [ebp], eax |
- | |
463 | mov [ebp+4], ecx |
- | |
464 | - | ||
465 | mov ecx, 8 |
- | |
466 | @@: |
- | |
467 | cmp byte [ebp+ecx-1], ' ' |
- | |
468 | loope @b |
- | |
469 | - | ||
470 | mov eax, [edi+8] |
- | |
471 | cmp al, ' ' |
- | |
472 | je .done |
- | |
473 | shl eax, 8 |
- | |
474 | mov al, '.' |
- | |
475 | - | ||
476 | lea ebp, [ebp+ecx+1] |
- | |
477 | mov [ebp], eax |
- | |
478 | mov ecx, 3 |
- | |
479 | @@: |
- | |
480 | rol eax, 8 |
- | |
481 | cmp al, ' ' |
- | |
482 | jne .done |
- | |
483 | loop @b |
- | |
484 | dec ebp |
- | |
485 | .done: |
- | |
486 | and byte [ebp+ecx+1], 0 ; CF=0 |
- | |
487 | pop ebp edi ecx |
- | |
488 | ret |
- | |
489 | .unicode_short: |
- | |
490 | mov ecx, 8 |
- | |
491 | push ecx |
- | |
492 | @@: |
- | |
493 | mov al, [edi] |
- | |
494 | inc edi |
- | |
495 | call ansi2uni_char |
- | |
496 | mov [ebp], ax |
- | |
497 | inc ebp |
- | |
498 | inc ebp |
- | |
499 | loop @b |
- | |
500 | pop ecx |
- | |
501 | @@: |
- | |
502 | cmp word [ebp-2], ' ' |
- | |
503 | jnz @f |
- | |
504 | dec ebp |
- | |
505 | dec ebp |
- | |
506 | loop @b |
- | |
507 | @@: |
- | |
508 | mov word [ebp], '.' |
- | |
509 | inc ebp |
- | |
510 | inc ebp |
- | |
511 | mov ecx, 3 |
- | |
512 | push ecx |
- | |
513 | @@: |
- | |
514 | mov al, [edi] |
- | |
515 | inc edi |
- | |
516 | call ansi2uni_char |
- | |
517 | mov [ebp], ax |
- | |
518 | inc ebp |
- | |
519 | inc ebp |
- | |
520 | loop @b |
- | |
521 | pop ecx |
- | |
522 | @@: |
- | |
523 | cmp word [ebp-2], ' ' |
- | |
524 | jnz @f |
- | |
525 | dec ebp |
- | |
526 | dec ebp |
- | |
527 | loop @b |
- | |
528 | dec ebp |
- | |
529 | dec ebp |
- | |
530 | @@: |
- | |
531 | and word [ebp], 0 ; CF=0 |
- | |
532 | pop ebp edi ecx |
- | |
533 | ret |
- | |
534 | .longname: |
- | |
535 | ; LFN |
- | |
536 | mov al, byte [edi] |
- | |
537 | and eax, 0x3F |
- | |
538 | dec eax |
18 | dd ramdisk_read |
539 | cmp al, 20 |
- | |
540 | jae .no ; ignore invalid entries |
- | |
541 | mov word [ebp+260*2], 0 ; force null-terminating for orphans |
- | |
542 | imul eax, 13*2 |
- | |
543 | add ebp, eax |
- | |
544 | test byte [edi], 0x40 |
- | |
545 | jz @f |
- | |
546 | mov word [ebp+13*2], 0 |
- | |
547 | @@: |
- | |
548 | push eax |
- | |
549 | ; now copy name from edi to ebp ... |
- | |
550 | mov eax, [edi+1] |
- | |
551 | mov [ebp], eax ; symbols 1,2 |
- | |
552 | mov eax, [edi+5] |
- | |
553 | mov [ebp+4], eax ; 3,4 |
- | |
554 | mov eax, [edi+9] |
- | |
555 | mov [ebp+8], ax ; 5 |
- | |
556 | mov eax, [edi+14] |
- | |
557 | mov [ebp+10], eax ; 6,7 |
- | |
558 | mov eax, [edi+18] |
- | |
559 | mov [ebp+14], eax ; 8,9 |
- | |
560 | mov eax, [edi+22] |
- | |
561 | mov [ebp+18], eax ; 10,11 |
- | |
562 | mov eax, [edi+28] |
- | |
563 | mov [ebp+22], eax ; 12,13 |
- | |
564 | ; ... done |
- | |
565 | pop eax |
- | |
566 | sub ebp, eax |
- | |
567 | test eax, eax |
- | |
568 | jz @f |
- | |
569 | ; if this is not first entry, more processing required |
- | |
570 | stc |
- | |
571 | ret |
- | |
572 | @@: |
- | |
573 | ; if this is first entry: |
- | |
574 | test byte [ebp-4], 1 |
- | |
575 | jnz .ret |
- | |
576 | ; buffer at ebp contains UNICODE name, convert it to ANSI |
- | |
577 | push esi edi |
- | |
578 | mov esi, ebp |
- | |
579 | mov edi, ebp |
- | |
580 | call uni2ansi_str |
- | |
581 | pop edi esi |
- | |
582 | .ret: |
- | |
583 | clc |
- | |
584 | ret |
- | |
585 | - | ||
586 | fat_compare_name: |
- | |
587 | ; compares ASCIIZ-names, case-insensitive (cp866 encoding) |
- | |
588 | ; in: esi->name, ebp->name |
- | |
589 | ; out: if names match: ZF=1 and esi->next component of name |
- | |
590 | ; else: ZF=0, esi is not changed |
- | |
591 | ; destroys eax |
- | |
592 | push ebp esi |
- | |
593 | .loop: |
- | |
594 | mov al, [ebp] |
- | |
595 | inc ebp |
- | |
596 | call char_toupper |
- | |
597 | push eax |
- | |
598 | lodsb |
- | |
599 | call char_toupper |
- | |
600 | cmp al, [esp] |
- | |
601 | jnz .done |
- | |
602 | pop eax |
- | |
603 | test al, al |
- | |
604 | jnz .loop |
- | |
605 | dec esi |
- | |
606 | pop eax |
- | |
607 | pop ebp |
- | |
608 | xor eax, eax ; set ZF flag |
- | |
609 | ret |
- | |
610 | .done: |
- | |
611 | cmp al, '/' |
- | |
612 | jnz @f |
- | |
613 | cmp byte [esp], 0 |
- | |
614 | jnz @f |
- | |
615 | mov [esp+4], esi |
- | |
616 | @@: |
- | |
617 | pop eax |
- | |
618 | pop esi ebp |
- | |
619 | ret |
- | |
620 | - | ||
621 | fat_time_to_bdfe: |
- | |
622 | ; in: eax=FAT time |
- | |
623 | ; out: eax=BDFE time |
- | |
624 | push ecx edx |
- | |
625 | mov ecx, eax |
- | |
626 | mov edx, eax |
- | |
627 | shr eax, 11 |
- | |
628 | shl eax, 16 ; hours |
- | |
629 | and edx, 0x1F |
- | |
630 | add edx, edx |
- | |
631 | mov al, dl ; seconds |
- | |
632 | shr ecx, 5 |
- | |
633 | and ecx, 0x3F |
- | |
634 | mov ah, cl ; minutes |
- | |
635 | pop edx ecx |
- | |
636 | ret |
- | |
637 | - | ||
638 | fat_date_to_bdfe: |
- | |
639 | push ecx edx |
- | |
640 | mov ecx, eax |
- | |
641 | mov edx, eax |
- | |
642 | shr eax, 9 |
- | |
643 | add ax, 1980 |
- | |
644 | shl eax, 16 ; year |
- | |
645 | and edx, 0x1F |
- | |
646 | mov al, dl ; day |
- | |
647 | shr ecx, 5 |
- | |
648 | and ecx, 0xF |
- | |
649 | mov ah, cl ; month |
- | |
650 | pop edx ecx |
- | |
651 | ret |
- | |
652 | - | ||
653 | bdfe_to_fat_time: |
- | |
654 | push edx |
- | |
655 | mov edx, eax |
- | |
656 | shr eax, 16 |
- | |
657 | and dh, 0x3F |
- | |
658 | shl eax, 6 |
- | |
659 | or al, dh |
- | |
660 | shr dl, 1 |
- | |
661 | and dl, 0x1F |
- | |
662 | shl eax, 5 |
- | |
663 | or al, dl |
- | |
664 | pop edx |
- | |
665 | ret |
- | |
666 | - | ||
667 | bdfe_to_fat_date: |
- | |
668 | push edx |
- | |
669 | mov edx, eax |
- | |
670 | shr eax, 16 |
- | |
671 | sub ax, 1980 |
- | |
672 | and dh, 0xF |
- | |
673 | shl eax, 4 |
- | |
674 | or al, dh |
- | |
675 | and dl, 0x1F |
- | |
676 | shl eax, 5 |
- | |
677 | or al, dl |
- | |
678 | pop edx |
- | |
679 | ret |
- | |
680 | - | ||
681 | fat_entry_to_bdfe: |
- | |
682 | ; convert FAT entry at edi to BDFE (block of data of folder entry) at esi, advance esi |
- | |
683 | ; destroys eax |
- | |
684 | mov eax, [ebp-4] |
- | |
685 | mov [esi+4], eax ; ASCII/UNICODE name |
- | |
686 | fat_entry_to_bdfe2: |
- | |
687 | movzx eax, byte [edi+11] |
- | |
688 | mov [esi], eax ; attributes |
- | |
689 | movzx eax, word [edi+14] |
- | |
690 | call fat_time_to_bdfe |
- | |
691 | mov [esi+8], eax ; creation time |
- | |
692 | movzx eax, word [edi+16] |
- | |
693 | call fat_date_to_bdfe |
- | |
694 | mov [esi+12], eax ; creation date |
- | |
695 | and dword [esi+16], 0 ; last access time is not supported on FAT |
- | |
696 | movzx eax, word [edi+18] |
- | |
697 | call fat_date_to_bdfe |
- | |
698 | mov [esi+20], eax ; last access date |
- | |
699 | movzx eax, word [edi+22] |
- | |
700 | call fat_time_to_bdfe |
- | |
701 | mov [esi+24], eax ; last write time |
- | |
702 | movzx eax, word [edi+24] |
- | |
703 | call fat_date_to_bdfe |
- | |
704 | mov [esi+28], eax ; last write date |
- | |
705 | mov eax, [edi+28] |
- | |
706 | mov [esi+32], eax ; file size (low dword) |
- | |
707 | xor eax, eax |
- | |
708 | mov [esi+36], eax ; file size (high dword) |
- | |
709 | test ebp, ebp |
- | |
710 | jz .ret |
- | |
711 | push ecx edi |
- | |
712 | lea edi, [esi+40] |
- | |
713 | mov esi, ebp |
- | |
714 | test byte [esi-4], 1 |
- | |
715 | jz .ansi |
- | |
716 | mov ecx, 260/2 |
- | |
717 | rep movsd |
- | |
718 | mov [edi-2], ax |
- | |
719 | @@: |
- | |
720 | mov esi, edi |
- | |
721 | pop edi ecx |
- | |
722 | .ret: |
- | |
723 | ret |
- | |
724 | .ansi: |
- | |
725 | mov ecx, 264/4 |
- | |
726 | rep movsd |
- | |
727 | mov [edi-1], al |
- | |
728 | jmp @b |
- | |
729 | - | ||
730 | bdfe_to_fat_entry: |
- | |
731 | ; convert BDFE at edx to FAT entry at edi |
- | |
732 | ; destroys eax |
- | |
733 | ; attributes byte |
- | |
734 | test byte [edi+11], 8 ; volume label? |
- | |
735 | jnz @f |
- | |
736 | mov al, [edx] |
- | |
737 | and al, 0x27 |
- | |
738 | and byte [edi+11], 0x10 |
- | |
739 | or byte [edi+11], al |
- | |
740 | @@: |
19 | dd ramdisk_write |
741 | mov eax, [edx+8] |
- | |
742 | call bdfe_to_fat_time |
- | |
743 | mov [edi+14], ax ; creation time |
- | |
744 | mov eax, [edx+12] |
- | |
745 | call bdfe_to_fat_date |
- | |
746 | mov [edi+16], ax ; creation date |
- | |
747 | mov eax, [edx+20] |
- | |
748 | call bdfe_to_fat_date |
- | |
749 | mov [edi+18], ax ; last access date |
20 | dd 0 ; no flush() function |
750 | mov eax, [edx+24] |
- | |
751 | call bdfe_to_fat_time |
- | |
752 | mov [edi+22], ax ; last write time |
- | |
753 | mov eax, [edx+28] |
- | |
754 | call bdfe_to_fat_date |
- | |
755 | mov [edi+24], ax ; last write date |
- | |
756 | ret |
- | |
757 | - | ||
758 | ramdisk_root_first: |
- | |
759 | mov edi, RAMDISK+512*19 |
- | |
760 | clc |
- | |
761 | ret |
- | |
762 | ramdisk_root_next: |
- | |
763 | add edi, 0x20 |
- | |
764 | cmp edi, RAMDISK+512*33 |
- | |
765 | cmc |
- | |
766 | ret |
- | |
767 | - | ||
768 | ramdisk_root_extend_dir: |
- | |
769 | stc |
- | |
770 | ret |
- | |
771 | - | ||
772 | uglobal |
- | |
773 | ; this is for delete support |
- | |
774 | rd_prev_sector dd ? |
21 | dd ramdisk_adjust_cache_size |
Line 775... | Line -... | ||
775 | rd_prev_prev_sector dd ? |
- | |
776 | endg |
- | |
777 | - | ||
778 | ramdisk_notroot_next: |
- | |
779 | add edi, 0x20 |
- | |
780 | test edi, 0x1FF |
- | |
781 | jz ramdisk_notroot_next_sector |
- | |
782 | ret ; CF=0 |
- | |
783 | ramdisk_notroot_next_sector: |
- | |
784 | push ecx |
- | |
785 | mov ecx, [eax] |
- | |
786 | push [rd_prev_sector] |
- | |
787 | pop [rd_prev_prev_sector] |
- | |
788 | mov [rd_prev_sector], ecx |
- | |
789 | mov ecx, [ecx*2+RAMDISK_FAT] |
- | |
790 | and ecx, 0xFFF |
- | |
791 | cmp ecx, 2849 |
- | |
792 | jae ramdisk_notroot_first.err2 |
- | |
793 | mov [eax], ecx |
- | |
794 | pop ecx |
- | |
795 | ramdisk_notroot_first: |
- | |
796 | mov eax, [eax] |
- | |
797 | cmp eax, 2 |
- | |
798 | jb .err |
- | |
799 | cmp eax, 2849 |
- | |
800 | jae .err |
- | |
801 | shl eax, 9 |
- | |
802 | lea edi, [eax+(31 shl 9)+RAMDISK] |
- | |
803 | clc |
- | |
804 | ret |
- | |
805 | .err2: |
- | |
806 | pop ecx |
- | |
807 | .err: |
- | |
808 | stc |
- | |
809 | ret |
- | |
810 | ramdisk_notroot_next_write: |
- | |
811 | test edi, 0x1FF |
- | |
812 | jz ramdisk_notroot_next_sector |
- | |
813 | ramdisk_root_next_write: |
- | |
814 | ret |
- | |
815 | - | ||
816 | ramdisk_notroot_extend_dir: |
- | |
817 | pusha |
- | |
818 | xor eax, eax |
- | |
819 | mov edi, RAMDISK_FAT |
- | |
820 | mov ecx, 2849 |
- | |
821 | repnz scasw |
- | |
822 | jnz .notfound |
- | |
823 | mov word [edi-2], 0xFFF |
- | |
824 | sub edi, RAMDISK_FAT |
- | |
825 | shr edi, 1 |
- | |
826 | dec edi |
- | |
827 | mov eax, [esp+28] |
- | |
828 | mov ecx, [eax] |
- | |
829 | mov [RAMDISK_FAT+ecx*2], di |
- | |
830 | mov [eax], edi |
- | |
831 | shl edi, 9 |
- | |
832 | add edi, (31 shl 9)+RAMDISK |
- | |
833 | mov [esp], edi |
- | |
834 | xor eax, eax |
- | |
835 | mov ecx, 128 |
- | |
836 | rep stosd |
- | |
837 | popa |
- | |
838 | clc |
- | |
839 | ret |
- | |
840 | .notfound: |
- | |
841 | popa |
- | |
842 | stc |
- | |
843 | ret |
22 | .size = $ - ramdisk_functions |
844 | - | ||
845 | rd_find_lfn: |
- | |
846 | ; in: esi+ebp -> name |
- | |
847 | ; out: CF=1 - file not found |
- | |
848 | ; else CF=0 and edi->direntry |
- | |
849 | push esi edi |
- | |
850 | push 0 |
- | |
851 | push ramdisk_root_first |
- | |
852 | push ramdisk_root_next |
- | |
853 | .loop: |
- | |
854 | call fat_find_lfn |
- | |
855 | jc .notfound |
- | |
856 | cmp byte [esi], 0 |
- | |
857 | jz .found |
- | |
858 | .continue: |
- | |
859 | test byte [edi+11], 10h |
- | |
860 | jz .notfound |
- | |
861 | movzx eax, word [edi+26] |
- | |
862 | mov [esp+8], eax |
- | |
863 | mov dword [esp+4], ramdisk_notroot_first |
- | |
864 | mov dword [esp], ramdisk_notroot_next |
- | |
865 | test eax, eax |
- | |
866 | jnz .loop |
- | |
867 | mov dword [esp+4], ramdisk_root_first |
- | |
868 | mov dword [esp], ramdisk_notroot_next |
- | |
869 | jmp .loop |
- | |
870 | .notfound: |
- | |
871 | add esp, 12 |
- | |
872 | pop edi esi |
- | |
873 | stc |
- | |
874 | ret |
- | |
875 | .found: |
- | |
876 | test ebp, ebp |
- | |
877 | jz @f |
- | |
878 | mov esi, ebp |
- | |
879 | xor ebp, ebp |
- | |
880 | jmp .continue |
- | |
881 | @@: |
- | |
882 | mov eax, [esp+8] |
- | |
883 | add esp, 16 ; CF=0 |
- | |
884 | pop esi |
- | |
885 | ret |
- | |
886 | 23 | endg |
|
887 | ;---------------------------------------------------------------- |
- | |
888 | ; |
- | |
889 | ; fs_RamdiskRead - LFN variant for reading sys floppy |
- | |
890 | ; |
- | |
891 | ; esi points to filename |
- | |
892 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
- | |
893 | ; may be ebx=0 - start from first byte |
- | |
894 | ; ecx number of bytes to read, 0+ |
- | |
895 | ; edx mem location to return data |
- | |
896 | ; |
- | |
897 | ; ret ebx = bytes read or 0xffffffff file not found |
- | |
898 | ; eax = 0 ok read or other = errormsg |
- | |
899 | ; |
- | |
900 | ;-------------------------------------------------------------- |
- | |
901 | fs_RamdiskRead: |
- | |
902 | cmp byte [esi], 0 |
- | |
903 | jnz @f |
- | |
904 | or ebx, -1 |
- | |
905 | mov eax, 10 ; access denied |
- | |
906 | ret |
- | |
907 | @@: |
- | |
908 | push edi |
- | |
909 | call rd_find_lfn |
- | |
910 | jnc .found |
- | |
911 | pop edi |
- | |
912 | or ebx, -1 |
- | |
913 | mov eax, 5 ; file not found |
- | |
914 | ret |
- | |
915 | .found: |
- | |
916 | test ebx, ebx |
- | |
917 | jz .l1 |
- | |
918 | cmp dword [ebx+4], 0 |
- | |
919 | jz @f |
- | |
920 | xor ebx, ebx |
- | |
921 | .reteof: |
- | |
922 | mov eax, 6 ; EOF |
- | |
923 | pop edi |
- | |
924 | ret |
- | |
925 | @@: |
- | |
926 | mov ebx, [ebx] |
- | |
927 | .l1: |
- | |
928 | push ecx edx |
- | |
929 | push 0 |
- | |
930 | mov eax, [edi+28] |
- | |
931 | sub eax, ebx |
- | |
932 | jb .eof |
- | |
933 | cmp eax, ecx |
- | |
934 | jae @f |
- | |
935 | mov ecx, eax |
- | |
936 | mov byte [esp], 6 ; EOF |
- | |
937 | @@: |
- | |
938 | movzx edi, word [edi+26] ; cluster |
- | |
939 | .new: |
- | |
940 | jecxz .done |
- | |
941 | test edi, edi |
- | |
942 | jz .eof |
- | |
943 | cmp edi, 0xFF8 |
- | |
944 | jae .eof |
- | |
945 | lea eax, [edi+31] ; bootsector+2*fat+filenames |
- | |
946 | shl eax, 9 ; *512 |
- | |
947 | add eax, RAMDISK ; image base |
- | |
948 | ; now eax points to data of cluster |
- | |
949 | sub ebx, 512 |
- | |
950 | jae .skip |
- | |
951 | lea eax, [eax+ebx+512] |
- | |
952 | neg ebx |
- | |
953 | push ecx |
- | |
954 | cmp ecx, ebx |
- | |
955 | jbe @f |
- | |
956 | mov ecx, ebx |
- | |
957 | @@: |
- | |
958 | mov ebx, edx |
- | |
959 | call memmove |
- | |
960 | add edx, ecx |
- | |
961 | sub [esp], ecx |
- | |
962 | pop ecx |
- | |
963 | xor ebx, ebx |
- | |
964 | .skip: |
- | |
965 | movzx edi, word [edi*2+RAMDISK_FAT] ; find next cluster from FAT |
- | |
966 | jmp .new |
- | |
967 | .eof: |
- | |
968 | mov ebx, edx |
- | |
969 | pop eax edx ecx |
- | |
970 | sub ebx, edx |
- | |
971 | jmp .reteof |
- | |
972 | .done: |
- | |
973 | mov ebx, edx |
- | |
974 | pop eax edx ecx edi |
- | |
975 | sub ebx, edx |
- | |
976 | ret |
- | |
977 | - | ||
978 | ;---------------------------------------------------------------- |
- | |
979 | ; |
24 | |
980 | ; fs_RamdiskReadFolder - LFN variant for reading sys floppy folder |
- | |
981 | ; |
- | |
982 | ; esi points to filename; only root is folder on ramdisk |
- | |
983 | ; ebx pointer to structure 32-bit number = first wanted block |
- | |
984 | ; & flags (bitfields) |
- | |
985 | ; flags: bit 0: 0=ANSI names, 1=UNICODE names |
- | |
986 | ; ecx number of blocks to read, 0+ |
- | |
987 | ; edx mem location to return data |
25 | ; See memmap.inc. |
988 | ; |
- | |
989 | ; ret ebx = size or 0xffffffff file not found |
- | |
990 | ; eax = 0 ok read or other = errormsg |
- | |
991 | ; |
- | |
992 | ;-------------------------------------------------------------- |
- | |
993 | fs_RamdiskReadFolder: |
- | |
994 | push edi |
- | |
995 | cmp byte [esi], 0 |
- | |
996 | jz .root |
- | |
997 | call rd_find_lfn |
- | |
998 | jnc .found |
- | |
999 | pop edi |
- | |
1000 | or ebx, -1 |
- | |
1001 | mov eax, ERROR_FILE_NOT_FOUND |
- | |
1002 | ret |
- | |
1003 | .found: |
- | |
1004 | test byte [edi+11], 0x10 |
- | |
1005 | jnz .found_dir |
- | |
1006 | pop edi |
- | |
1007 | or ebx, -1 |
- | |
1008 | mov eax, ERROR_ACCESS_DENIED |
- | |
1009 | ret |
- | |
1010 | .found_dir: |
- | |
1011 | movzx eax, word [edi+26] |
- | |
1012 | add eax, 31 |
- | |
1013 | push 0 |
- | |
1014 | jmp .doit |
- | |
1015 | .root: |
- | |
1016 | mov eax, 19 |
- | |
1017 | push 14 |
- | |
1018 | .doit: |
- | |
1019 | push esi ecx ebp |
- | |
1020 | sub esp, 262*2 ; reserve space for LFN |
- | |
1021 | mov ebp, esp |
- | |
1022 | push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE names |
- | |
1023 | mov ebx, [ebx] |
- | |
1024 | ; init header |
- | |
1025 | push eax ecx |
- | |
1026 | mov edi, edx |
- | |
1027 | mov ecx, 32/4 |
- | |
1028 | xor eax, eax |
- | |
1029 | rep stosd |
- | |
1030 | mov byte [edx], 1 ; version |
- | |
1031 | pop ecx eax |
- | |
1032 | mov esi, edi ; esi points to block of data of folder entry (BDFE) |
- | |
1033 | .main_loop: |
- | |
1034 | mov edi, eax |
- | |
1035 | shl edi, 9 |
- | |
1036 | add edi, RAMDISK |
- | |
1037 | push eax |
- | |
1038 | .l1: |
- | |
1039 | call fat_get_name |
- | |
1040 | jc .l2 |
- | |
1041 | cmp byte [edi+11], 0xF |
- | |
1042 | jnz .do_bdfe |
- | |
1043 | add edi, 0x20 |
- | |
1044 | test edi, 0x1FF |
- | |
1045 | jnz .do_bdfe |
- | |
1046 | pop eax |
- | |
1047 | inc eax |
- | |
1048 | dec byte [esp+262*2+16] |
- | |
1049 | jz .done |
- | |
1050 | jns @f |
- | |
1051 | ; read next sector from FAT |
- | |
1052 | mov eax, [(eax-31-1)*2+RAMDISK_FAT] |
- | |
1053 | and eax, 0xFFF |
- | |
1054 | cmp eax, 0xFF8 |
- | |
1055 | jae .done |
- | |
1056 | add eax, 31 |
- | |
1057 | mov byte [esp+262*2+16], 0 |
- | |
1058 | @@: |
- | |
1059 | mov edi, eax |
- | |
1060 | shl edi, 9 |
- | |
1061 | add edi, RAMDISK |
- | |
1062 | push eax |
- | |
1063 | .do_bdfe: |
- | |
1064 | inc dword [edx+8] ; new file found |
- | |
1065 | dec ebx |
- | |
1066 | jns .l2 |
- | |
1067 | dec ecx |
- | |
1068 | js .l2 |
- | |
1069 | inc dword [edx+4] ; new file block copied |
- | |
1070 | call fat_entry_to_bdfe |
- | |
1071 | .l2: |
- | |
1072 | add edi, 0x20 |
- | |
1073 | test edi, 0x1FF |
- | |
1074 | jnz .l1 |
- | |
1075 | pop eax |
- | |
1076 | inc eax |
- | |
1077 | dec byte [esp+262*2+16] |
- | |
1078 | jz .done |
- | |
1079 | jns @f |
- | |
1080 | ; read next sector from FAT |
- | |
1081 | mov eax, [(eax-31-1)*2+RAMDISK_FAT] |
- | |
1082 | and eax, 0xFFF |
- | |
1083 | cmp eax, 0xFF8 |
- | |
1084 | jae .done |
- | |
1085 | add eax, 31 |
- | |
1086 | mov byte [esp+262*2+16], 0 |
- | |
1087 | @@: |
- | |
1088 | jmp .main_loop |
- | |
1089 | .done: |
- | |
1090 | add esp, 262*2+4 |
- | |
1091 | pop ebp |
- | |
1092 | mov ebx, [edx+4] |
- | |
1093 | xor eax, eax |
- | |
1094 | dec ecx |
- | |
1095 | js @f |
- | |
1096 | mov al, ERROR_END_OF_FILE |
- | |
Line 1097... | Line 26... | ||
1097 | @@: |
26 | ; Currently size of memory allocated for the ramdisk is fixed. |
1098 | pop ecx esi edi edi |
- | |
1099 | ret |
- | |
1100 | - | ||
1101 | iglobal |
27 | ; This should be revisited when/if memory map would become more dynamic. |
1102 | label fat_legal_chars byte |
- | |
1103 | ; 0 = not allowed |
- | |
1104 | ; 1 = allowed only in long names |
- | |
1105 | ; 3 = allowed |
- | |
1106 | times 32 db 0 |
- | |
1107 | ; ! " # $ % & ' ( ) * + , - . / |
- | |
1108 | db 1,3,0,3,3,3,3,3,3,3,0,1,1,3,3,0 |
- | |
1109 | ; 0 1 2 3 4 5 6 7 8 9 : ; < = > ? |
- | |
1110 | db 3,3,3,3,3,3,3,3,3,3,0,1,0,1,0,0 |
- | |
1111 | ; @ A B C D E F G H I J K L M N O |
28 | RAMDISK_CAPACITY = 2880 ; in sectors |
1112 | db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 |
- | |
1113 | ; P Q R S T U V W X Y Z [ \ ] ^ _ |
- | |
1114 | db 3,3,3,3,3,3,3,3,3,3,3,1,0,1,3,3 |
- | |
1115 | ; ` a b c d e f g h i j k l m n o |
29 | |
Line 1116... | Line -... | ||
1116 | db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3 |
- | |
1117 | ; p q r s t u v w x y z { | } ~ |
- | |
1118 | db 3,3,3,3,3,3,3,3,3,3,3,3,0,3,3,0 |
30 | iglobal |
1119 | endg |
- | |
1120 | - | ||
1121 | fat_name_is_legal: |
31 | align 4 |
1122 | ; in: esi->(long) name |
- | |
1123 | ; out: CF set <=> legal |
- | |
1124 | ; destroys eax |
- | |
1125 | push esi |
- | |
1126 | xor eax, eax |
- | |
1127 | @@: |
- | |
1128 | lodsb |
32 | ramdisk_actual_size dd RAMDISK_CAPACITY |
1129 | test al, al |
33 | endg |
1130 | jz .done |
34 | |
1131 | cmp al, 80h |
35 | ; This function is called early in boot process. |
1132 | jae .big |
- | |
1133 | test [fat_legal_chars+eax], 1 |
- | |
1134 | jnz @b |
36 | ; It creates filesystem /rd/1 based on raw image data loaded by somebody before |
1135 | .err: |
- | |
1136 | pop esi |
- | |
1137 | clc |
- | |
1138 | ret |
37 | ; to memory named as RAMDISK with max size RAMDISK_CAPACITY, may be less. |
1139 | .big: |
- | |
1140 | ; 0x80-0xAF, 0xE0-0xEF |
38 | proc ramdisk_init |
1141 | cmp al, 0xB0 |
- | |
1142 | jb @b |
- | |
1143 | cmp al, 0xE0 |
- | |
1144 | jb .err |
39 | iglobal |
1145 | cmp al, 0xF0 |
40 | ramdisk_name db 'rd',0 |
1146 | jb @b |
41 | endg |
1147 | jmp .err |
- | |
1148 | .done: |
- | |
1149 | sub esi, [esp] |
- | |
1150 | cmp esi, 257 |
- | |
1151 | pop esi |
- | |
1152 | ret |
- | |
1153 | - | ||
1154 | fat_next_short_name: |
42 | push ebx esi ; save used registers to be stdcall |
1155 | ; in: edi->8+3 name |
- | |
1156 | ; out: name corrected |
- | |
1157 | ; CF=1 <=> error |
- | |
1158 | pushad |
43 | ; 1. Register the device and the (always inserted) media in the disk subsystem. |
1159 | mov ecx, 8 |
- | |
1160 | mov al, '~' |
- | |
1161 | std |
- | |
1162 | push edi |
- | |
1163 | add edi, 7 |
44 | stdcall disk_add, ramdisk_functions, ramdisk_name, 0, 0 |
1164 | repnz scasb |
- | |
1165 | pop edi |
- | |
1166 | cld |
45 | test eax, eax |
1167 | jz .tilde |
- | |
1168 | ; tilde is not found, insert "~1" at end |
- | |
1169 | add edi, 6 |
46 | jz .fail |
1170 | cmp word [edi], ' ' |
- | |
1171 | jnz .insert_tilde |
- | |
1172 | @@: |
- | |
1173 | dec edi |
47 | mov ebx, eax |
1174 | cmp byte [edi], ' ' |
- | |
1175 | jz @b |
- | |
1176 | inc edi |
- | |
1177 | .insert_tilde: |
- | |
1178 | mov word [edi], '~1' |
- | |
1179 | popad |
- | |
1180 | clc |
48 | stdcall disk_media_changed, eax, 1 |
1181 | ret |
- | |
1182 | .tilde: |
- | |
1183 | push edi |
- | |
1184 | add edi, 7 |
- | |
1185 | xor ecx, ecx |
- | |
1186 | @@: |
- | |
1187 | ; after tilde may be only digits and trailing spaces |
- | |
1188 | cmp byte [edi], '~' |
- | |
1189 | jz .break |
- | |
1190 | cmp byte [edi], ' ' |
- | |
1191 | jz .space |
- | |
1192 | cmp byte [edi], '9' |
- | |
1193 | jnz .found |
- | |
1194 | dec edi |
- | |
1195 | jmp @b |
- | |
1196 | .space: |
- | |
1197 | dec edi |
- | |
1198 | inc ecx |
- | |
1199 | jmp @b |
- | |
1200 | .found: |
- | |
1201 | inc byte [edi] |
- | |
1202 | add dword [esp], 8 |
- | |
1203 | jmp .zerorest |
- | |
1204 | .break: |
- | |
1205 | jecxz .noplace |
- | |
1206 | inc edi |
- | |
1207 | mov al, '1' |
- | |
1208 | @@: |
- | |
1209 | xchg al, [edi] |
- | |
1210 | inc edi |
- | |
1211 | cmp al, ' ' |
- | |
1212 | mov al, '0' |
- | |
1213 | jnz @b |
- | |
1214 | .succ: |
- | |
1215 | pop edi |
- | |
1216 | popad |
- | |
1217 | clc |
- | |
1218 | ret |
- | |
1219 | .noplace: |
- | |
1220 | dec edi |
- | |
1221 | cmp edi, [esp] |
- | |
1222 | jz .err |
- | |
1223 | add dword [esp], 8 |
- | |
1224 | mov word [edi], '~1' |
- | |
1225 | inc edi |
- | |
1226 | inc edi |
- | |
1227 | @@: |
- | |
1228 | mov byte [edi], '0' |
- | |
1229 | .zerorest: |
- | |
1230 | inc edi |
- | |
1231 | cmp edi, [esp] |
- | |
1232 | jb @b |
- | |
1233 | pop edi |
- | |
1234 | popad |
- | |
1235 | ;clc ; automatically |
- | |
1236 | ret |
- | |
1237 | .err: |
- | |
1238 | pop edi |
- | |
1239 | popad |
- | |
1240 | stc |
- | |
1241 | ret |
- | |
1242 | - | ||
1243 | fat_gen_short_name: |
- | |
1244 | ; in: esi->long name |
- | |
1245 | ; edi->buffer (8+3=11 chars) |
- | |
1246 | ; out: buffer filled |
- | |
1247 | pushad |
- | |
1248 | mov eax, ' ' |
- | |
1249 | push edi |
49 | ; 2. We don't know actual size of loaded image, |
1250 | stosd |
- | |
1251 | stosd |
- | |
1252 | stosd |
- | |
1253 | pop edi |
- | |
1254 | xor eax, eax |
- | |
1255 | movi ebx, 8 |
- | |
1256 | lea ecx, [edi+8] |
- | |
1257 | .loop: |
- | |
1258 | lodsb |
- | |
1259 | test al, al |
- | |
1260 | jz .done |
- | |
1261 | call char_toupper |
50 | ; so try to calculate it using partition structure, |
1262 | cmp al, ' ' |
- | |
1263 | jz .space |
- | |
1264 | cmp al, 80h |
- | |
1265 | ja .big |
- | |
1266 | test [fat_legal_chars+eax], 2 |
- | |
1267 | jnz .symbol |
51 | ; assuming that file systems fill the real size based on contents of the partition. |
1268 | .inv_symbol: |
52 | ; 2a. Prepare for loop over partitions. |
1269 | mov al, '_' |
- | |
1270 | or bh, 1 |
- | |
1271 | .symbol: |
53 | xor ecx, ecx |
1272 | cmp al, '.' |
- | |
1273 | jz .dot |
- | |
1274 | .normal_symbol: |
- | |
1275 | dec bl |
- | |
1276 | jns .store |
54 | xor edx, edx |
1277 | mov bl, 0 |
- | |
1278 | .space: |
- | |
1279 | or bh, 1 |
- | |
1280 | jmp .loop |
- | |
1281 | .store: |
55 | ; 2b. Check that at least one partition was recognized. |
1282 | stosb |
- | |
1283 | jmp .loop |
- | |
1284 | .big: |
- | |
1285 | cmp al, 0xB0 |
56 | cmp [ebx+DISK.NumPartitions], ecx |
1286 | jb .normal_symbol |
57 | jz .fail |
1287 | cmp al, 0xE0 |
- | |
1288 | jb .inv_symbol |
- | |
1289 | cmp al, 0xF0 |
58 | ; 2c. Loop over partitions. |
1290 | jb .normal_symbol |
- | |
1291 | jmp .inv_symbol |
59 | .partitions: |
1292 | .dot: |
- | |
1293 | test bh, 2 |
- | |
1294 | jz .firstdot |
60 | ; For every partition, set edx to maximum between edx and end of partition. |
1295 | pop ebx |
61 | mov esi, [ebx+DISK.Partitions] |
1296 | add ebx, edi |
- | |
1297 | sub ebx, ecx |
- | |
1298 | push ebx |
- | |
1299 | cmp ebx, ecx |
- | |
1300 | jb @f |
- | |
1301 | pop ebx |
- | |
1302 | push ecx |
- | |
1303 | @@: |
- | |
1304 | cmp edi, ecx |
- | |
1305 | jbe .skip |
- | |
1306 | @@: |
- | |
1307 | dec edi |
- | |
1308 | mov al, [edi] |
- | |
1309 | dec ebx |
- | |
1310 | mov [ebx], al |
- | |
1311 | mov byte [edi], ' ' |
- | |
1312 | cmp edi, ecx |
- | |
1313 | ja @b |
- | |
1314 | .skip: |
- | |
1315 | mov bh, 3 |
- | |
1316 | jmp @f |
- | |
1317 | .firstdot: |
- | |
1318 | cmp bl, 8 |
62 | mov esi, [esi+ecx*4] |
1319 | jz .space |
- | |
1320 | push edi |
- | |
1321 | or bh, 2 |
- | |
1322 | @@: |
- | |
1323 | mov edi, ecx |
- | |
1324 | mov bl, 3 |
- | |
1325 | jmp .loop |
- | |
1326 | .done: |
- | |
1327 | test bh, 2 |
- | |
1328 | jz @f |
- | |
1329 | pop edi |
- | |
1330 | @@: |
- | |
1331 | lea edi, [ecx-8] |
- | |
1332 | test bh, 1 |
- | |
1333 | jz @f |
- | |
1334 | call fat_next_short_name |
- | |
1335 | @@: |
- | |
1336 | popad |
- | |
1337 | ret |
- | |
1338 | - | ||
1339 | ;---------------------------------------------------------------- |
- | |
1340 | ; |
- | |
1341 | ; fs_RamdiskRewrite - LFN variant for writing ramdisk |
- | |
1342 | ; fs_RamdiskCreateFolder - create folder on ramdisk |
- | |
1343 | ; |
- | |
1344 | ; esi points to file/folder name |
- | |
1345 | ; ebx ignored (reserved) |
- | |
1346 | ; ecx number of bytes to write, 0+ (ignored for folders) |
- | |
1347 | ; edx mem location to data (ignored for folders) |
- | |
1348 | ; |
63 | mov eax, dword [esi+PARTITION.FirstSector] |
1349 | ; ret ebx = number of written bytes |
- | |
1350 | ; eax = 0 ok read or other = errormsg |
64 | add eax, dword [esi+PARTITION.Length] |
1351 | ; |
- | |
1352 | ;-------------------------------------------------------------- |
- | |
1353 | @@: |
- | |
1354 | mov eax, ERROR_ACCESS_DENIED |
65 | cmp eax, edx |
1355 | xor ebx, ebx |
66 | jb @f |
1356 | ret |
- | |
1357 | 67 | mov edx, eax |
|
1358 | fs_RamdiskCreateFolder: |
68 | @@: |
1359 | mov al, 1 ; create folder |
- | |
1360 | jmp fs_RamdiskRewrite.common |
69 | inc ecx |
1361 | 70 | cmp ecx, [ebx+DISK.NumPartitions] |
|
1362 | fs_RamdiskRewrite: |
- | |
1363 | xor eax, eax ; create file |
71 | jb .partitions |
1364 | .common: |
72 | ; 3. Reclaim unused memory, if any. |
1365 | cmp byte [esi], 0 |
73 | mov [ramdisk_actual_size], edx |
1366 | jz @b |
74 | add edx, 7 ; aligning up |
1367 | pushad |
75 | shr edx, 3 ; 512-byte sectors -> 4096-byte pages |
1368 | xor edi, edi |
76 | mov esi, RAMDISK_CAPACITY / 8 ; aligning down |
1369 | push esi |
77 | sub esi, edx |
1370 | test ebp, ebp |
78 | jbe .no_reclaim |
1371 | jz @f |
79 | shl edx, 12 |
1372 | mov esi, ebp |
80 | add edx, RAMDISK - OS_BASE |
1373 | @@: |
81 | @@: |
1374 | lodsb |
- | |
1375 | test al, al |
- | |
1376 | jz @f |
- | |
1377 | cmp al, '/' |
- | |
1378 | jnz @b |
- | |
1379 | lea edi, [esi-1] |
- | |
1380 | jmp @b |
- | |
1381 | @@: |
- | |
1382 | pop esi |
- | |
1383 | test edi, edi |
- | |
1384 | jnz .noroot |
- | |
1385 | test ebp, ebp |
- | |
1386 | jnz .hasebp |
- | |
1387 | push ramdisk_root_extend_dir |
- | |
1388 | push ramdisk_root_next_write |
- | |
1389 | push edi |
- | |
1390 | push ramdisk_root_first |
- | |
1391 | push ramdisk_root_next |
- | |
1392 | jmp .common1 |
- | |
1393 | .hasebp: |
- | |
1394 | mov eax, ERROR_ACCESS_DENIED |
- | |
1395 | cmp byte [ebp], 0 |
- | |
1396 | jz .ret1 |
- | |
1397 | push ebp |
- | |
1398 | xor ebp, ebp |
82 | mov eax, edx |
1399 | call rd_find_lfn |
- | |
1400 | pop esi |
- | |
1401 | jc .notfound0 |
- | |
1402 | jmp .common0 |
- | |
1403 | .noroot: |
- | |
1404 | mov eax, ERROR_ACCESS_DENIED |
- | |
1405 | cmp byte [edi+1], 0 |
- | |
1406 | jz .ret1 |
- | |
1407 | ; check existence |
- | |
1408 | mov byte [edi], 0 |
- | |
1409 | push edi |
- | |
1410 | call rd_find_lfn |
- | |
1411 | pop esi |
- | |
1412 | mov byte [esi], '/' |
- | |
1413 | jnc @f |
- | |
1414 | .notfound0: |
- | |
1415 | mov eax, ERROR_FILE_NOT_FOUND |
- | |
1416 | .ret1: |
- | |
1417 | mov [esp+28], eax |
- | |
1418 | popad |
- | |
1419 | xor ebx, ebx |
- | |
1420 | ret |
- | |
1421 | @@: |
- | |
1422 | inc esi |
- | |
1423 | .common0: |
- | |
1424 | test byte [edi+11], 0x10 ; must be directory |
- | |
1425 | mov eax, ERROR_ACCESS_DENIED |
- | |
1426 | jz .ret1 |
- | |
1427 | movzx ebp, word [edi+26] ; ebp=cluster |
- | |
1428 | mov eax, ERROR_FAT_TABLE |
- | |
1429 | cmp ebp, 2 |
- | |
1430 | jb .ret1 |
- | |
1431 | cmp ebp, 2849 |
- | |
1432 | jae .ret1 |
- | |
1433 | push ramdisk_notroot_extend_dir |
- | |
1434 | push ramdisk_notroot_next_write |
- | |
1435 | push ebp |
- | |
1436 | push ramdisk_notroot_first |
- | |
1437 | push ramdisk_notroot_next |
- | |
1438 | .common1: |
- | |
1439 | call fat_find_lfn |
- | |
1440 | jc .notfound |
83 | call free_page |
1441 | ; found |
- | |
1442 | test byte [edi+11], 10h |
- | |
1443 | jz .exists_file |
- | |
1444 | ; found directory; if we are creating directory, return OK, |
- | |
1445 | ; if we are creating file, say "access denied" |
- | |
1446 | add esp, 20 |
- | |
1447 | popad |
- | |
1448 | test al, al |
- | |
1449 | mov eax, ERROR_ACCESS_DENIED |
- | |
1450 | jz @f |
- | |
1451 | mov al, 0 |
- | |
1452 | @@: |
- | |
1453 | xor ebx, ebx |
- | |
1454 | ret |
- | |
1455 | .exists_file: |
- | |
1456 | ; found file; if we are creating directory, return "access denied", |
- | |
1457 | ; if we are creating file, delete existing file and continue |
- | |
1458 | cmp byte [esp+20+28], 0 |
- | |
1459 | jz @f |
- | |
1460 | add esp, 20 |
- | |
1461 | popad |
- | |
1462 | mov eax, ERROR_ACCESS_DENIED |
- | |
1463 | xor ebx, ebx |
- | |
1464 | ret |
- | |
1465 | @@: |
- | |
1466 | ; delete FAT chain |
- | |
1467 | push edi |
- | |
1468 | xor eax, eax |
- | |
1469 | mov dword [edi+28], eax ; zero size |
- | |
1470 | xchg ax, word [edi+26] ; start cluster |
- | |
1471 | test eax, eax |
- | |
1472 | jz .done1 |
- | |
1473 | @@: |
- | |
1474 | cmp eax, 0xFF8 |
- | |
1475 | jae .done1 |
- | |
1476 | lea edi, [RAMDISK_FAT + eax*2] ; position in FAT |
- | |
1477 | xor eax, eax |
- | |
1478 | xchg ax, [edi] |
- | |
1479 | jmp @b |
- | |
1480 | .done1: |
- | |
1481 | pop edi |
- | |
1482 | call get_time_for_file |
- | |
1483 | mov [edi+22], ax |
- | |
1484 | call get_date_for_file |
- | |
1485 | mov [edi+24], ax |
- | |
1486 | mov [edi+18], ax |
- | |
1487 | or byte [edi+11], 20h ; set 'archive' attribute |
- | |
1488 | jmp .doit |
- | |
1489 | .notfound: |
- | |
1490 | ; file is not found; generate short name |
- | |
1491 | call fat_name_is_legal |
- | |
1492 | jc @f |
- | |
1493 | add esp, 20 |
- | |
1494 | popad |
- | |
1495 | mov eax, ERROR_FILE_NOT_FOUND |
- | |
1496 | xor ebx, ebx |
- | |
1497 | ret |
- | |
1498 | @@: |
- | |
1499 | sub esp, 12 |
- | |
1500 | mov edi, esp |
- | |
1501 | call fat_gen_short_name |
- | |
1502 | .test_short_name_loop: |
- | |
1503 | push esi edi ecx |
- | |
1504 | mov esi, edi |
- | |
1505 | lea eax, [esp+12+12+8] |
- | |
1506 | mov [eax], ebp |
- | |
1507 | call dword [eax-4] |
- | |
1508 | jc .found |
- | |
1509 | .test_short_name_entry: |
- | |
1510 | cmp byte [edi+11], 0xF |
- | |
1511 | jz .test_short_name_cont |
- | |
1512 | mov ecx, 11 |
- | |
1513 | push esi edi |
- | |
1514 | repz cmpsb |
- | |
1515 | pop edi esi |
- | |
1516 | jz .short_name_found |
- | |
1517 | .test_short_name_cont: |
- | |
1518 | lea eax, [esp+12+12+8] |
- | |
1519 | call dword [eax-8] |
- | |
1520 | jnc .test_short_name_entry |
- | |
1521 | jmp .found |
- | |
1522 | .short_name_found: |
- | |
1523 | pop ecx edi esi |
- | |
1524 | call fat_next_short_name |
- | |
1525 | jnc .test_short_name_loop |
- | |
1526 | .disk_full: |
- | |
1527 | add esp, 12+20 |
- | |
1528 | popad |
- | |
1529 | mov eax, ERROR_DISK_FULL |
- | |
1530 | xor ebx, ebx |
- | |
1531 | ret |
- | |
1532 | .found: |
- | |
1533 | pop ecx edi esi |
- | |
1534 | ; now find space in directory |
- | |
1535 | ; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~' |
- | |
1536 | mov al, '~' |
- | |
1537 | push ecx edi |
- | |
1538 | mov ecx, 8 |
- | |
1539 | repnz scasb |
- | |
1540 | movi eax, 1 ; 1 entry |
- | |
1541 | jnz .notilde |
- | |
1542 | ; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total |
- | |
1543 | xor eax, eax |
- | |
1544 | @@: |
- | |
1545 | cmp byte [esi], 0 |
- | |
1546 | jz @f |
- | |
1547 | inc esi |
- | |
1548 | inc eax |
- | |
1549 | jmp @b |
- | |
1550 | @@: |
- | |
1551 | sub esi, eax |
- | |
1552 | add eax, 12+13 |
- | |
1553 | mov ecx, 13 |
- | |
1554 | push edx |
- | |
1555 | cdq |
- | |
1556 | div ecx |
- | |
1557 | pop edx |
- | |
1558 | .notilde: |
- | |
1559 | push -1 |
- | |
1560 | push -1 |
- | |
1561 | ; find |
- | |
1562 | xor ecx, ecx |
- | |
1563 | push eax |
- | |
1564 | lea eax, [esp+12+8+12+8] |
- | |
1565 | mov [eax], ebp |
- | |
1566 | call dword [eax-4] |
- | |
1567 | pop eax |
- | |
1568 | .scan_dir: |
- | |
1569 | cmp byte [edi], 0 |
- | |
1570 | jz .free |
- | |
1571 | cmp byte [edi], 0xE5 |
- | |
1572 | jz .free |
- | |
1573 | xor ecx, ecx |
- | |
1574 | .scan_cont: |
- | |
1575 | push eax |
- | |
1576 | lea eax, [esp+12+8+12+8] |
- | |
1577 | call dword [eax-8] |
- | |
1578 | pop eax |
- | |
1579 | jnc .scan_dir |
- | |
1580 | push eax |
- | |
1581 | lea eax, [esp+12+8+12+8] |
- | |
1582 | call dword [eax+8] ; extend directory |
- | |
1583 | pop eax |
- | |
1584 | jnc .scan_dir |
84 | add edx, 0x1000 |
1585 | add esp, 8+8+12+20 |
85 | dec esi |
- | 86 | jnz @b |
|
- | 87 | .no_reclaim: |
|
- | 88 | pop esi ebx ; restore used registers to be stdcall |
|
- | 89 | ret |
|
- | 90 | .fail: |
|
- | 91 | dbgstr 'Failed to initialize ramdisk' |
|
- | 92 | pop esi ebx ; restore used registers to be stdcall |
|
- | 93 | ret |
|
- | 94 | endp |
|
- | 95 | ||
- | 96 | ; Returns information about disk media. |
|
- | 97 | proc ramdisk_querymedia |
|
1586 | popad |
98 | virtual at esp+4 |
1587 | mov eax, ERROR_DISK_FULL |
99 | .userdata dd ? |
- | 100 | .info dd ? |
|
- | 101 | end virtual |
|
- | 102 | ; Media is always present, sector size is always 512 bytes. |
|
- | 103 | mov edx, [.userdata] |
|
- | 104 | mov ecx, [.info] |
|
- | 105 | mov [ecx+DISKMEDIAINFO.Flags], 0 |
|
1588 | xor ebx, ebx |
106 | mov [ecx+DISKMEDIAINFO.SectorSize], 512 |
- | 107 | mov eax, [ramdisk_actual_size] |
|
- | 108 | mov dword [ecx+DISKMEDIAINFO.Capacity], eax |
|
- | 109 | mov dword [ecx+DISKMEDIAINFO.Capacity+4], 0 |
|
- | 110 | ; Return zero as an indicator of success. |
|
- | 111 | xor eax, eax |
|
- | 112 | retn 8 |
|
- | 113 | endp |
|
- | 114 | ||
- | 115 | ; Common procedure for reading and writing. |
|
1589 | ret |
116 | ; operation = 0 for reading, operation = 1 for writing. |
1590 | .free: |
117 | ; Arguments of ramdisk_read and ramdisk_write are the same. |
- | 118 | macro ramdisk_read_write operation |
|
- | 119 | { |
|
- | 120 | push esi edi ; save used registers to be stdcall |
|
1591 | test ecx, ecx |
121 | mov esi, [userdata] |
- | 122 | mov edi, [numsectors_ptr] |
|
- | 123 | ; 1. Determine number of sectors to be transferred. |
|
- | 124 | ; This is either the requested number of sectors or number of sectors |
|
- | 125 | ; up to the disk boundary, depending of what is less. |
|
- | 126 | xor ecx, ecx |
|
- | 127 | ; 1a. Test whether [start_sector] is less than RAMDISK_CAPACITY. |
|
- | 128 | ; If so, calculate number of sectors between [start_sector] and RAMDISK_CAPACITY. |
|
1592 | jnz @f |
129 | ; Otherwise, the actual number of sectors is zero. |
- | 130 | cmp dword [start_sector+4], ecx |
|
1593 | mov [esp], edi |
131 | jnz .got_number |
- | 132 | mov eax, [ramdisk_actual_size] |
|
- | 133 | sub eax, dword [start_sector] |
|
1594 | mov ecx, [esp+8+8+12+8] |
134 | jbe .got_number |
1595 | mov [esp+4], ecx |
- | |
1596 | xor ecx, ecx |
- | |
1597 | @@: |
- | |
1598 | inc ecx |
- | |
1599 | cmp ecx, eax |
- | |
1600 | jb .scan_cont |
- | |
1601 | ; found! |
- | |
1602 | ; If creating a directory, allocate one data cluster now and fail immediately |
- | |
1603 | ; if this is impossible. This prevents from creating an invalid directory entry |
- | |
1604 | ; on a full disk. |
- | |
1605 | ; yup, the argument is quite non-intuitive... but what should I do if |
- | |
1606 | ; the entire function uses such arguments? BTW, it refers to al from pushad, |
- | |
1607 | ; which in turn is filled with 0 in fs_RamdiskRewrite and 1 in fs_RamdiskCreateFolder. |
- | |
1608 | push esi ecx |
- | |
1609 | cmp byte [esp+24+12+20+28], 0 |
- | |
1610 | jz .no.preallocate.folder.data |
- | |
1611 | mov ecx, 2849 |
- | |
1612 | mov edi, RAMDISK_FAT |
- | |
1613 | xor eax, eax |
- | |
1614 | repnz scasw |
- | |
1615 | jz @f |
- | |
1616 | add esp, 24 |
- | |
1617 | jmp .disk_full |
- | |
1618 | @@: |
- | |
1619 | mov [esp+24+12+20+20], edi ; store the cluster somewhere |
- | |
1620 | .no.preallocate.folder.data: |
- | |
1621 | ; calculate name checksum |
- | |
1622 | mov esi, [esp+8+8] |
- | |
1623 | mov ecx, 11 |
- | |
1624 | xor eax, eax |
- | |
1625 | @@: |
- | |
1626 | ror al, 1 |
- | |
1627 | add al, [esi] |
- | |
1628 | inc esi |
- | |
1629 | loop @b |
- | |
1630 | pop ecx esi |
- | |
1631 | pop edi |
- | |
1632 | pop dword [esp+8+12+8] |
- | |
1633 | ; edi points to last entry in free chunk |
- | |
1634 | dec ecx |
- | |
1635 | jz .nolfn |
- | |
1636 | push esi |
- | |
1637 | push eax |
- | |
1638 | mov al, 40h |
- | |
1639 | .writelfn: |
- | |
1640 | or al, cl |
- | |
1641 | mov esi, [esp+4] |
- | |
1642 | push ecx |
- | |
1643 | dec ecx |
- | |
1644 | imul ecx, 13 |
- | |
1645 | add esi, ecx |
- | |
1646 | stosb |
- | |
1647 | mov cl, 5 |
- | |
1648 | call .read_symbols |
- | |
1649 | mov ax, 0xF |
- | |
1650 | stosw |
- | |
1651 | mov al, [esp+4] |
- | |
1652 | stosb |
- | |
1653 | mov cl, 6 |
- | |
1654 | call .read_symbols |
- | |
1655 | xor eax, eax |
- | |
1656 | stosw |
- | |
1657 | mov cl, 2 |
- | |
1658 | call .read_symbols |
- | |
1659 | pop ecx |
- | |
1660 | lea eax, [esp+8+8+12+8] |
- | |
1661 | call dword [eax+4] ; next write |
- | |
1662 | xor eax, eax |
- | |
1663 | loop .writelfn |
- | |
1664 | pop eax |
- | |
1665 | pop esi |
- | |
1666 | .nolfn: |
- | |
1667 | xchg esi, [esp] |
- | |
1668 | mov ecx, 11 |
- | |
1669 | rep movsb |
- | |
1670 | mov word [edi], 20h ; attributes |
- | |
1671 | sub edi, 11 |
- | |
1672 | pop esi ecx |
- | |
1673 | add esp, 12 |
- | |
1674 | mov byte [edi+13], 0 ; tenths of a second at file creation time |
- | |
1675 | call get_time_for_file |
- | |
1676 | mov [edi+14], ax ; creation time |
- | |
1677 | mov [edi+22], ax ; last write time |
- | |
1678 | call get_date_for_file |
- | |
1679 | mov [edi+16], ax ; creation date |
- | |
1680 | mov [edi+24], ax ; last write date |
- | |
1681 | mov [edi+18], ax ; last access date |
- | |
1682 | and word [edi+20], 0 ; high word of cluster |
- | |
1683 | and word [edi+26], 0 ; low word of cluster - to be filled |
- | |
1684 | and dword [edi+28], 0 ; file size - to be filled |
- | |
1685 | cmp byte [esp+20+28], 0 |
- | |
1686 | jz .doit |
- | |
1687 | ; create directory |
- | |
1688 | mov byte [edi+11], 10h ; attributes: folder |
- | |
1689 | mov ecx, 32*2 |
- | |
1690 | mov edx, edi |
- | |
1691 | push edx |
- | |
1692 | push ecx |
- | |
1693 | push edi |
- | |
1694 | add edi, 26 ; edi points to low word of cluster |
- | |
1695 | push edi |
- | |
1696 | mov edi, [esp+16+20+20] |
- | |
1697 | jmp .doit2 |
- | |
1698 | .doit: |
- | |
1699 | push edx |
- | |
1700 | push ecx |
- | |
1701 | push edi |
- | |
1702 | add edi, 26 ; edi points to low word of cluster |
- | |
1703 | push edi |
- | |
1704 | jecxz .done |
- | |
1705 | mov ecx, 2849 |
- | |
1706 | mov edi, RAMDISK_FAT |
- | |
1707 | .write_loop: |
- | |
1708 | ; allocate new cluster |
- | |
1709 | xor eax, eax |
- | |
1710 | repnz scasw |
- | |
1711 | jnz .disk_full2 |
- | |
1712 | .doit2: |
- | |
1713 | dec edi |
- | |
1714 | dec edi |
- | |
1715 | - | ||
1716 | ; lea eax, [edi-(RAMDISK_FAT)] |
- | |
1717 | - | ||
1718 | mov eax, edi |
- | |
1719 | sub eax, RAMDISK_FAT |
- | |
1720 | - | ||
1721 | shr eax, 1 ; eax = cluster |
- | |
1722 | mov word [edi], 0xFFF ; mark as last cluster |
- | |
1723 | xchg edi, [esp] |
- | |
1724 | stosw |
- | |
1725 | pop edi |
- | |
1726 | push edi |
- | |
1727 | inc ecx |
- | |
1728 | ; write data |
- | |
1729 | cmp byte [esp+16+20+28], 0 |
- | |
1730 | jnz .writedir |
- | |
1731 | shl eax, 9 |
- | |
1732 | add eax, RAMDISK+31*512 |
- | |
1733 | .writefile: |
- | |
1734 | mov ebx, edx |
- | |
1735 | xchg eax, ebx |
- | |
1736 | push ecx |
- | |
1737 | mov ecx, 512 |
- | |
1738 | cmp dword [esp+12], ecx |
- | |
1739 | jae @f |
- | |
1740 | mov ecx, [esp+12] |
- | |
1741 | @@: |
- | |
1742 | call memmove |
- | |
1743 | add edx, ecx |
- | |
1744 | sub [esp+12], ecx |
- | |
1745 | pop ecx |
- | |
1746 | jnz .write_loop |
- | |
1747 | .done: |
- | |
1748 | mov ebx, edx |
- | |
1749 | pop edi edi ecx edx |
- | |
1750 | sub ebx, edx |
- | |
1751 | mov [edi+28], ebx |
- | |
1752 | add esp, 20 |
- | |
1753 | mov [esp+16], ebx |
- | |
1754 | popad |
- | |
1755 | xor eax, eax |
- | |
1756 | ret |
- | |
1757 | .disk_full2: |
- | |
1758 | mov ebx, edx |
- | |
1759 | pop edi edi ecx edx |
- | |
1760 | sub ebx, edx |
- | |
1761 | mov [edi+28], ebx |
- | |
1762 | add esp, 20 |
- | |
1763 | mov [esp+16], ebx |
- | |
1764 | popad |
- | |
1765 | movi eax, ERROR_DISK_FULL |
- | |
1766 | ret |
- | |
1767 | .writedir: |
- | |
1768 | mov edi, eax |
- | |
1769 | shl edi, 9 |
- | |
1770 | add edi, RAMDISK+31*512 |
- | |
1771 | mov esi, edx |
- | |
1772 | mov ecx, 32/4 |
- | |
1773 | push ecx |
- | |
1774 | rep movsd |
- | |
1775 | mov dword [edi-32], '. ' |
- | |
1776 | mov dword [edi-32+4], ' ' |
- | |
1777 | mov dword [edi-32+8], ' ' |
- | |
1778 | mov byte [edi-32+11], 10h |
- | |
1779 | mov word [edi-32+26], ax |
- | |
1780 | mov esi, edx |
- | |
1781 | pop ecx |
- | |
1782 | rep movsd |
- | |
1783 | mov dword [edi-32], '.. ' |
- | |
1784 | mov dword [edi-32+4], ' ' |
- | |
1785 | mov dword [edi-32+8], ' ' |
- | |
1786 | mov byte [edi-32+11], 10h |
- | |
1787 | mov eax, [esp+16+8] |
- | |
1788 | mov word [edi-32+26], ax |
- | |
1789 | xor eax, eax |
- | |
1790 | mov ecx, (512-32*2)/4 |
- | |
1791 | rep stosd |
- | |
1792 | pop edi edi ecx edx |
- | |
1793 | add esp, 20 |
- | |
1794 | popad |
- | |
1795 | xor eax, eax |
- | |
1796 | xor ebx, ebx |
- | |
1797 | ret |
- | |
1798 | - | ||
1799 | .read_symbol: |
- | |
1800 | or ax, -1 |
- | |
1801 | test esi, esi |
- | |
1802 | jz .retFFFF |
- | |
1803 | lodsb |
- | |
1804 | test al, al |
- | |
1805 | jnz ansi2uni_char |
- | |
1806 | xor eax, eax |
- | |
1807 | xor esi, esi |
- | |
1808 | .retFFFF: |
- | |
1809 | ret |
- | |
1810 | - | ||
1811 | .read_symbols: |
- | |
1812 | call .read_symbol |
- | |
1813 | stosw |
- | |
1814 | loop .read_symbols |
- | |
1815 | ret |
- | |
1816 | - | ||
1817 | ;---------------------------------------------------------------- |
- | |
1818 | ; |
- | |
1819 | ; fs_RamdiskWrite - LFN variant for writing to sys floppy |
- | |
1820 | ; |
- | |
1821 | ; esi points to filename |
- | |
1822 | ; ebx pointer to 64-bit number = first wanted byte, 0+ |
- | |
1823 | ; may be ebx=0 - start from first byte |
- | |
1824 | ; ecx number of bytes to write, 0+ |
- | |
1825 | ; edx mem location to data |
- | |
1826 | ; |
- | |
1827 | ; ret ebx = bytes written (maybe 0) |
- | |
1828 | ; eax = 0 ok write or other = errormsg |
- | |
1829 | ; |
- | |
1830 | ;-------------------------------------------------------------- |
- | |
1831 | @@: |
- | |
1832 | push ERROR_ACCESS_DENIED |
- | |
1833 | fs_RamdiskWrite.ret0: |
- | |
1834 | pop eax |
- | |
1835 | xor ebx, ebx |
- | |
1836 | ret |
- | |
1837 | - | ||
1838 | fs_RamdiskWrite: |
- | |
1839 | cmp byte [esi], 0 |
- | |
1840 | jz @b |
- | |
1841 | pushad |
- | |
1842 | call rd_find_lfn |
- | |
1843 | jnc .found |
- | |
1844 | popad |
- | |
1845 | push ERROR_FILE_NOT_FOUND |
- | |
1846 | jmp .ret0 |
- | |
1847 | .found: |
- | |
1848 | ; must not be directory |
- | |
1849 | test byte [edi+11], 10h |
- | |
1850 | jz @f |
- | |
1851 | popad |
- | |
1852 | push ERROR_ACCESS_DENIED |
- | |
1853 | jmp .ret0 |
- | |
1854 | @@: |
- | |
1855 | ; FAT does not support files larger than 4GB |
- | |
1856 | test ebx, ebx |
- | |
1857 | jz .l1 |
- | |
1858 | cmp dword [ebx+4], 0 |
- | |
1859 | jz @f |
- | |
1860 | .eof: |
- | |
1861 | popad |
- | |
1862 | push ERROR_END_OF_FILE |
- | |
1863 | jmp .ret0 |
- | |
1864 | @@: |
- | |
1865 | mov ebx, [ebx] |
- | |
1866 | .l1: |
- | |
1867 | ; now edi points to direntry, ebx=start byte to write, |
- | |
1868 | ; ecx=number of bytes to write, edx=data pointer |
- | |
1869 | call fat_update_datetime |
- | |
1870 | - | ||
1871 | ; extend file if needed |
- | |
1872 | add ecx, ebx |
- | |
1873 | jc .eof ; FAT does not support files larger than 4GB |
- | |
1874 | push 0 ; return value=0 |
- | |
1875 | cmp ecx, [edi+28] |
- | |
1876 | jbe .length_ok |
- | |
1877 | cmp ecx, ebx |
- | |
1878 | jz .length_ok |
- | |
1879 | call ramdisk_extend_file |
- | |
1880 | jnc .length_ok |
- | |
1881 | ; ramdisk_extend_file can return two error codes: FAT table error or disk full. |
- | |
1882 | ; First case is fatal error, in second case we may write some data |
- | |
1883 | mov [esp], eax |
- | |
1884 | cmp al, ERROR_DISK_FULL |
- | |
1885 | jz .disk_full |
- | |
1886 | pop eax |
- | |
1887 | mov [esp+28], eax |
- | |
1888 | popad |
- | |
1889 | xor ebx, ebx |
- | |
1890 | ret |
- | |
1891 | .disk_full: |
- | |
1892 | ; correct number of bytes to write |
- | |
1893 | mov ecx, [edi+28] |
- | |
1894 | cmp ecx, ebx |
- | |
1895 | ja .length_ok |
- | |
1896 | .ret: |
- | |
1897 | pop eax |
- | |
1898 | mov [esp+28], eax ; eax=return value |
- | |
1899 | sub edx, [esp+20] |
- | |
1900 | mov [esp+16], edx ; ebx=number of written bytes |
- | |
1901 | popad |
- | |
1902 | ret |
- | |
1903 | .length_ok: |
- | |
1904 | ; now ebx=start pos, ecx=end pos, both lie inside file |
- | |
1905 | sub ecx, ebx |
- | |
1906 | jz .ret |
- | |
1907 | movzx edi, word [edi+26] ; starting cluster |
- | |
1908 | .write_loop: |
- | |
1909 | sub ebx, 0x200 |
- | |
1910 | jae .next_cluster |
- | |
1911 | push ecx |
- | |
1912 | neg ebx |
- | |
1913 | cmp ecx, ebx |
- | |
1914 | jbe @f |
- | |
1915 | mov ecx, ebx |
- | |
1916 | @@: |
- | |
1917 | mov eax, edi |
- | |
1918 | shl eax, 9 |
- | |
1919 | add eax, RAMDISK+31*512+0x200 |
- | |
1920 | sub eax, ebx |
- | |
1921 | mov ebx, eax |
- | |
1922 | mov eax, edx |
- | |
1923 | call memmove |
- | |
1924 | xor ebx, ebx |
- | |
1925 | add edx, ecx |
- | |
1926 | sub [esp], ecx |
- | |
1927 | pop ecx |
- | |
1928 | jz .ret |
- | |
1929 | .next_cluster: |
- | |
1930 | movzx edi, word [edi*2+RAMDISK_FAT] |
- | |
1931 | jmp .write_loop |
- | |
1932 | - | ||
1933 | ramdisk_extend_file.zero_size: |
- | |
1934 | xor eax, eax |
- | |
1935 | jmp ramdisk_extend_file.start_extend |
- | |
1936 | - | ||
1937 | ; extends file on ramdisk to given size, new data area is filled by 0 |
- | |
1938 | ; in: edi->direntry, ecx=new size |
- | |
1939 | ; out: CF=0 => OK, eax=0 |
- | |
1940 | ; CF=1 => error, eax=code (ERROR_FAT_TABLE or ERROR_DISK_FULL) |
- | |
1941 | ramdisk_extend_file: |
- | |
1942 | push ecx |
- | |
1943 | ; find the last cluster of file |
- | |
1944 | movzx eax, word [edi+26] ; first cluster |
- | |
1945 | mov ecx, [edi+28] |
- | |
1946 | jecxz .zero_size |
- | |
1947 | @@: |
- | |
1948 | sub ecx, 0x200 |
- | |
1949 | jbe @f |
- | |
1950 | mov eax, [eax*2+RAMDISK_FAT] |
- | |
1951 | and eax, 0xFFF |
- | |
1952 | jz .fat_err |
- | |
1953 | cmp eax, 0xFF8 |
- | |
1954 | jb @b |
- | |
1955 | .fat_err: |
- | |
1956 | pop ecx |
- | |
1957 | movi eax, ERROR_FAT_TABLE |
- | |
1958 | stc |
- | |
1959 | ret |
- | |
1960 | @@: |
- | |
1961 | push eax |
135 | ; 1b. Get the requested number of sectors. |
1962 | mov eax, [eax*2+RAMDISK_FAT] |
- | |
1963 | and eax, 0xFFF |
- | |
1964 | cmp eax, 0xFF8 |
- | |
1965 | pop eax |
- | |
1966 | jb .fat_err |
- | |
1967 | ; set length to full number of sectors and make sure that last sector is zero-padded |
- | |
1968 | sub [edi+28], ecx |
- | |
1969 | push eax edi |
- | |
1970 | mov edi, eax |
- | |
1971 | shl edi, 9 |
- | |
1972 | lea edi, [edi+RAMDISK+31*512+0x200+ecx] |
- | |
1973 | neg ecx |
- | |
1974 | xor eax, eax |
- | |
1975 | rep stosb |
- | |
1976 | pop edi eax |
- | |
1977 | .start_extend: |
- | |
1978 | pop ecx |
- | |
1979 | ; now do extend |
- | |
1980 | push edx esi |
- | |
1981 | mov esi, RAMDISK_FAT+2*2 ; start scan from cluster 2 |
- | |
1982 | mov edx, 2847 ; number of clusters to scan |
- | |
1983 | .extend_loop: |
- | |
1984 | cmp [edi+28], ecx |
- | |
1985 | jae .extend_done |
- | |
1986 | ; add new sector |
- | |
1987 | push ecx |
- | |
1988 | mov ecx, edx |
- | |
1989 | push edi |
- | |
1990 | mov edi, esi |
- | |
1991 | jecxz .disk_full |
- | |
1992 | push eax |
- | |
1993 | xor eax, eax |
- | |
1994 | repnz scasw |
- | |
1995 | pop eax |
- | |
1996 | jnz .disk_full |
- | |
1997 | mov word [edi-2], 0xFFF |
- | |
1998 | mov esi, edi |
- | |
1999 | mov edx, ecx |
- | |
2000 | sub edi, RAMDISK_FAT |
- | |
2001 | shr edi, 1 |
- | |
2002 | dec edi ; now edi=new cluster |
- | |
2003 | test eax, eax |
- | |
2004 | jz .first_cluster |
- | |
2005 | mov [RAMDISK_FAT+eax*2], di |
- | |
2006 | jmp @f |
- | |
2007 | .first_cluster: |
- | |
2008 | pop eax ; eax->direntry |
- | |
2009 | push eax |
- | |
2010 | mov [eax+26], di |
- | |
2011 | @@: |
- | |
2012 | push edi |
- | |
2013 | shl edi, 9 |
- | |
2014 | add edi, RAMDISK+31*512 |
- | |
2015 | xor eax, eax |
- | |
2016 | mov ecx, 512/4 |
- | |
2017 | rep stosd |
- | |
2018 | pop eax ; eax=new cluster |
- | |
2019 | pop edi ; edi->direntry |
- | |
2020 | pop ecx ; ecx=required size |
- | |
2021 | add dword [edi+28], 0x200 |
- | |
2022 | jmp .extend_loop |
- | |
2023 | .extend_done: |
- | |
2024 | mov [edi+28], ecx |
- | |
2025 | pop esi edx |
- | |
2026 | xor eax, eax ; CF=0 |
- | |
2027 | ret |
- | |
2028 | .disk_full: |
- | |
2029 | pop edi ecx |
- | |
2030 | pop esi edx |
- | |
2031 | stc |
- | |
2032 | movi eax, ERROR_DISK_FULL |
- | |
2033 | ret |
- | |
2034 | - | ||
2035 | fat_update_datetime: |
- | |
2036 | call get_time_for_file |
- | |
2037 | mov [edi+22], ax ; last write time |
- | |
2038 | call get_date_for_file |
- | |
2039 | mov [edi+24], ax ; last write date |
- | |
2040 | mov [edi+18], ax ; last access date |
- | |
2041 | ret |
- | |
2042 | - | ||
2043 | ;---------------------------------------------------------------- |
- | |
2044 | ; |
- | |
2045 | ; fs_RamdiskSetFileEnd - set end of file on ramdisk |
- | |
2046 | ; |
- | |
2047 | ; esi points to filename |
- | |
2048 | ; ebx points to 64-bit number = new file size |
- | |
2049 | ; ecx ignored (reserved) |
- | |
2050 | ; edx ignored (reserved) |
- | |
2051 | ; |
- | |
2052 | ; ret eax = 0 ok or other = errormsg |
- | |
2053 | ; |
- | |
2054 | ;-------------------------------------------------------------- |
- | |
2055 | fs_RamdiskSetFileEnd: |
- | |
2056 | cmp byte [esi], 0 |
- | |
2057 | jnz @f |
- | |
2058 | .access_denied: |
- | |
2059 | push ERROR_ACCESS_DENIED |
- | |
2060 | jmp .ret |
- | |
2061 | @@: |
- | |
2062 | push edi |
- | |
2063 | call rd_find_lfn |
- | |
2064 | jnc @f |
- | |
2065 | pop edi |
- | |
2066 | push ERROR_FILE_NOT_FOUND |
- | |
2067 | .ret: |
- | |
2068 | pop eax |
- | |
2069 | ret |
- | |
2070 | @@: |
- | |
2071 | ; must not be directory |
- | |
2072 | test byte [edi+11], 10h |
- | |
2073 | jz @f |
- | |
2074 | pop edi |
- | |
2075 | jmp .access_denied |
- | |
2076 | @@: |
- | |
2077 | ; file size must not exceed 4Gb |
- | |
2078 | cmp dword [ebx+4], 0 |
- | |
2079 | jz @f |
- | |
2080 | pop edi |
- | |
2081 | push ERROR_END_OF_FILE |
- | |
2082 | jmp .ret |
- | |
2083 | @@: |
- | |
2084 | ; set file modification date/time to current |
- | |
2085 | call fat_update_datetime |
- | |
2086 | mov eax, [ebx] |
- | |
2087 | cmp eax, [edi+28] |
- | |
2088 | jb .truncate |
- | |
2089 | ja .expand |
- | |
2090 | pop edi |
- | |
2091 | xor eax, eax |
- | |
2092 | ret |
- | |
2093 | .expand: |
- | |
2094 | push ecx |
- | |
2095 | mov ecx, eax |
- | |
2096 | call ramdisk_extend_file |
- | |
2097 | pop ecx |
- | |
2098 | pop edi |
- | |
2099 | ret |
- | |
2100 | .truncate: |
- | |
2101 | mov [edi+28], eax |
- | |
2102 | push ecx |
- | |
2103 | movzx ecx, word [edi+26] |
- | |
2104 | test eax, eax |
- | |
2105 | jz .zero_size |
- | |
2106 | ; find new last sector |
- | |
2107 | @@: |
- | |
2108 | sub eax, 0x200 |
- | |
2109 | jbe @f |
- | |
2110 | movzx ecx, word [RAMDISK_FAT+ecx*2] |
- | |
2111 | jmp @b |
- | |
2112 | @@: |
- | |
2113 | ; zero data at the end of last sector |
136 | mov ecx, [edi] |
2114 | push ecx |
- | |
2115 | mov edi, ecx |
- | |
2116 | shl edi, 9 |
- | |
2117 | lea edi, [edi+RAMDISK+31*512+eax+0x200] |
- | |
2118 | mov ecx, eax |
- | |
2119 | neg ecx |
- | |
2120 | xor eax, eax |
- | |
2121 | rep stosb |
- | |
2122 | pop ecx |
- | |
2123 | ; terminate FAT chain |
- | |
2124 | lea ecx, [RAMDISK_FAT+ecx+ecx] |
- | |
2125 | push dword [ecx] |
137 | ; 1c. If it is greater than number of sectors calculated in 1a, use the value |
2126 | mov word [ecx], 0xFFF |
- | |
2127 | pop ecx |
- | |
2128 | and ecx, 0xFFF |
138 | ; from 1a. |
2129 | jmp .delete |
- | |
2130 | .zero_size: |
- | |
2131 | and word [edi+26], 0 |
- | |
2132 | .delete: |
- | |
2133 | ; delete FAT chain starting with ecx |
- | |
2134 | ; mark all clusters as free |
- | |
2135 | cmp ecx, 0xFF8 |
- | |
2136 | jae .deleted |
- | |
2137 | lea ecx, [RAMDISK_FAT+ecx+ecx] |
- | |
2138 | push dword [ecx] |
- | |
2139 | and word [ecx], 0 |
- | |
2140 | pop ecx |
- | |
2141 | and ecx, 0xFFF |
- | |
2142 | jmp .delete |
- | |
2143 | .deleted: |
- | |
2144 | pop ecx |
- | |
2145 | pop edi |
- | |
2146 | xor eax, eax |
- | |
2147 | ret |
139 | cmp ecx, eax |
2148 | - | ||
2149 | fs_RamdiskGetFileInfo: |
- | |
2150 | cmp byte [esi], 0 |
- | |
2151 | jnz @f |
- | |
2152 | mov eax, 2 ; unsupported |
- | |
2153 | ret |
- | |
2154 | @@: |
- | |
2155 | push edi |
- | |
2156 | call rd_find_lfn |
- | |
2157 | fs_GetFileInfo_finish: |
- | |
2158 | jnc @f |
- | |
2159 | pop edi |
- | |
2160 | mov eax, ERROR_FILE_NOT_FOUND |
- | |
2161 | ret |
- | |
2162 | @@: |
140 | jb .got_number |
2163 | push esi ebp |
- | |
2164 | xor ebp, ebp |
- | |
2165 | mov esi, edx |
141 | mov ecx, eax |
2166 | and dword [esi+4], 0 |
- | |
2167 | call fat_entry_to_bdfe2 |
- | |
2168 | pop ebp esi |
- | |
2169 | pop edi |
142 | .got_number: |
2170 | xor eax, eax |
- | |
2171 | ret |
- | |
2172 | - | ||
2173 | fs_RamdiskSetFileInfo: |
- | |
2174 | cmp byte [esi], 0 |
- | |
2175 | jnz @f |
- | |
2176 | mov eax, 2 ; unsupported |
143 | ; 2. Compare the actual number of sectors with requested. If they are |
2177 | ret |
- | |
2178 | @@: |
144 | ; equal, set eax (it will be the returned value) to zero. Otherwise, |
2179 | push edi |
- | |
2180 | call rd_find_lfn |
145 | ; use DISK_STATUS_END_OF_MEDIA. |
2181 | jnc @f |
146 | xor eax, eax |
2182 | pop edi |
- | |
2183 | mov eax, ERROR_FILE_NOT_FOUND |
147 | cmp ecx, [edi] |
2184 | ret |
- | |
2185 | @@: |
- | |
2186 | call bdfe_to_fat_entry |
- | |
2187 | pop edi |
- | |
2188 | xor eax, eax |
- | |
2189 | ret |
- | |
2190 | - | ||
2191 | ;---------------------------------------------------------------- |
- | |
2192 | ; |
148 | jz @f |
2193 | ; fs_RamdiskDelete - delete file or empty folder from ramdisk |
- | |
2194 | ; |
- | |
2195 | ; esi points to filename |
- | |
2196 | ; |
- | |
2197 | ; ret eax = 0 ok or other = errormsg |
- | |
2198 | ; |
- | |
2199 | ;-------------------------------------------------------------- |
- | |
2200 | fs_RamdiskDelete: |
- | |
2201 | cmp byte [esi], 0 |
- | |
2202 | jnz @f |
- | |
2203 | ; cannot delete root! |
- | |
2204 | .access_denied: |
- | |
2205 | push ERROR_ACCESS_DENIED |
- | |
2206 | .pop_ret: |
- | |
2207 | pop eax |
- | |
2208 | ret |
- | |
2209 | @@: |
- | |
2210 | and [rd_prev_sector], 0 |
149 | mov al, DISK_STATUS_END_OF_MEDIA |
2211 | and [rd_prev_prev_sector], 0 |
- | |
2212 | push edi |
- | |
2213 | call rd_find_lfn |
- | |
2214 | jnc .found |
- | |
2215 | pop edi |
- | |
2216 | push ERROR_FILE_NOT_FOUND |
- | |
2217 | jmp .pop_ret |
- | |
2218 | .found: |
- | |
2219 | cmp dword [edi], '. ' |
- | |
2220 | jz .access_denied2 |
- | |
2221 | cmp dword [edi], '.. ' |
150 | @@: |
2222 | jz .access_denied2 |
- | |
2223 | test byte [edi+11], 10h |
- | |
2224 | jz .dodel |
151 | ; 3. Store the actual number of sectors. |
2225 | ; we can delete only empty folders! |
- | |
2226 | movzx eax, word [edi+26] |
- | |
2227 | push ebx |
- | |
2228 | mov ebx, eax |
- | |
2229 | shl ebx, 9 |
- | |
2230 | add ebx, RAMDISK + 31*0x200 + 2*0x20 |
- | |
2231 | .checkempty: |
152 | mov [edi], ecx |
2232 | cmp byte [ebx], 0 |
- | |
2233 | jz .empty |
- | |
2234 | cmp byte [ebx], 0xE5 |
- | |
2235 | jnz .notempty |
- | |
2236 | add ebx, 0x20 |
- | |
2237 | test ebx, 0x1FF |
153 | ; 4. Calculate source and destination addresses. |
2238 | jnz .checkempty |
- | |
2239 | movzx eax, word [RAMDISK_FAT + eax*2] |
- | |
2240 | test eax, eax |
- | |
2241 | jz .empty |
- | |
2242 | mov ebx, eax |
- | |
2243 | shl ebx, 9 |
- | |
2244 | add ebx, RAMDISK + 31*0x200 |
- | |
2245 | jmp .checkempty |
- | |
2246 | .notempty: |
- | |
2247 | pop ebx |
- | |
2248 | .access_denied2: |
- | |
2249 | pop edi |
- | |
2250 | jmp .access_denied |
154 | if operation = 0 ; reading? |
2251 | .empty: |
- | |
2252 | pop ebx |
- | |
2253 | .dodel: |
- | |
2254 | movzx eax, word [edi+26] |
- | |
2255 | ; delete folder entry |
- | |
2256 | mov byte [edi], 0xE5 |
- | |
2257 | ; delete LFN (if present) |
- | |
2258 | .lfndel: |
- | |
2259 | test edi, 0x1FF |
- | |
2260 | jnz @f |
155 | mov esi, dword [start_sector] |
2261 | cmp [rd_prev_sector], 0 |
- | |
2262 | jz @f |
- | |
2263 | cmp [rd_prev_sector], -1 |
- | |
2264 | jz .lfndone |
156 | shl esi, 9 |
2265 | mov edi, [rd_prev_sector] |
157 | add esi, RAMDISK |
2266 | push [rd_prev_prev_sector] |
- | |
2267 | pop [rd_prev_sector] |
158 | mov edi, [buffer] |
- | 159 | else ; writing? |
|
2268 | or [rd_prev_prev_sector], -1 |
160 | mov edi, dword [start_sector] |
2269 | shl edi, 9 |
161 | shl edi, 9 |
2270 | add edi, RAMDISK + 31*0x200 + 0x200 |
162 | add edi, RAMDISK |
2271 | @@: |
163 | mov esi, [buffer] |
2272 | sub edi, 0x20 |
164 | end if |
2273 | cmp byte [edi], 0xE5 |
165 | ; 5. Calculate number of dwords to be transferred. |
2274 | jz .lfndone |
166 | shl ecx, 9-2 |
- | 167 | ; 6. Copy data. |
|
2275 | cmp byte [edi+11], 0xF |
168 | rep movsd |
- | 169 | ; 7. Return. The value in eax was calculated in step 2. |
|
2276 | jnz .lfndone |
170 | pop edi esi ; restore used registers to be stdcall |
2277 | mov byte [edi], 0xE5 |
171 | } |
- | 172 | ||
- | 173 | ; Reads one or more sectors from the device. |
|
- | 174 | proc ramdisk_read userdata:dword, buffer:dword, start_sector:qword, numsectors_ptr:dword |
|
- | 175 | ramdisk_read_write 0 |
|
2278 | jmp .lfndel |
176 | ret |
2279 | .lfndone: |
177 | endp |
- | 178 | ||
- | 179 | ; Writes one or more sectors to the device. |
|
2280 | ; delete FAT chain |
180 | proc ramdisk_write userdata:dword, buffer:dword, start_sector:qword, numsectors_ptr:dword |
2281 | cmp eax, 2 |
181 | ramdisk_read_write 1 |
2282 | jb .done |
182 | ret |
2283 | cmp eax, 0xFF8 |
183 | endp |
2284 | jae .done |
184 | |
2285 | lea eax, [RAMDISK_FAT + eax*2] |
185 | ; The kernel calls this function when initializing cache subsystem for |
2286 | push dword [eax] |
186 | ; the media. This call allows the driver to adjust the cache size. |
2287 | and word [eax], 0 |
187 | proc ramdisk_adjust_cache_size |
2288 | pop eax |
188 | virtual at esp+4 |
2289 | and eax, 0xFFF |
189 | .userdata dd ? |
2290 | jmp .lfndone |
190 | .suggested_size dd ? |
2291 | .done: |
- |