WebSVN – Kolibri OS – Blame – /kernel/trunk/fs/fat12.inc

Rev	Author	Line No.	Line
1	ha	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		2	;; ;;
		3	;; FAT12.INC ;;
		4	;; (C) 2005 Mario79, License: GPL ;;
		5	;; ;;
		6	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
		7
		8	n_sector dd 0 ; temporary save for sector value
		9	flp_status dd 0
		10	clust_tmp_flp dd 0 ; used by analyze_directory and analyze_directory_to_write
		11	path_pointer_flp dd 0
		12	pointer_file_name_flp dd 0
		13	save_root_flag db 0
		14	save_flag db 0
		15	root_read db 0 ; 0-necessary to load root, 1-not to load root
		16	flp_fat db 0 ; 0-necessary to load fat, 1-not to load fat
		17	flp_number db 0 ; 1- Floppy A, 2-Floppy B
		18	old_track db 0 ; old value track
		19	flp_label rb 15 ; Label and ID of inserted floppy disk
		20
		21	reserve_flp:
		22
		23	cli
		24	cmp [flp_status],0
		25	je reserve_flp_ok
		26
		27	sti
		28	call change_task
		29	jmp reserve_flp
		30
		31	reserve_flp_ok:
		32
		33	push eax
379	serge	34	mov eax,[CURRENT_TASK]
1	ha	35	shl eax,5
379	serge	36	mov eax,[eax+CURRENT_TASK+TASKDATA.pid]
1	ha	37	mov [flp_status],eax
		38	pop eax
		39	sti
		40	ret
		41
		42	floppy_free_space:
		43	;---------------------------------------------
		44	;
		45	; returns free space in edi
		46	;
		47	;---------------------------------------------
		48	push eax ebx ecx
		49	call read_flp_fat
		50	cmp [FDC_Status],0
		51	jne fdc_status_error_2
133	diamond	52	mov eax,0x282004
1	ha	53	xor edi,edi
		54	mov ecx,2847 ;1448000/512
		55	rdfs1_1:
		56	mov ebx,[eax]
		57	and ebx,4095
		58	jne rdfs2_1
		59	add edi,512
		60	rdfs2_1:
		61	add eax,2
		62	loop rdfs1_1
		63	fdc_status_error_2:
		64	pop ecx ebx eax
		65	ret
		66
		67
131	diamond	68
		69
1	ha	70	floppy_fileread:
		71	;----------------------------------------------------------------
		72	;
		73	; fileread - sys floppy
		74	;
		75	; eax points to filename 11 chars - for root directory
		76	; ebx first wanted block ; 1+ ; if 0 then set to 1
		77	; ecx number of blocks to read ; 1+ ; if 0 then set to 1
		78	; edx mem location to return data
		79	; esi length of filename 12*X
		80	; edi pointer to path /fd/1/...... - for all files in nested directories
		81	;
		82	; ret ebx = size or 0xffffffff file not found
		83	; eax = 0 ok read or other = errormsg
		84	; 10 = access denied
		85	;--------------------------------------------------------------
		86
		87	mov [save_flag],0
		88	mov [path_pointer_flp],edi
		89	cmp esi,0 ; return ramdisk root
		90	jne fr_noroot_1
		91	cmp ebx,224/16
		92	jbe fr_do_1
		93	mov eax,5
		94	mov ebx,0
		95	mov [flp_status],0
		96	ret
		97
		98	fr_do_1:
		99	push ebx ecx edx
		100	call read_flp_root
		101	pop edx ecx ebx
		102	cmp [FDC_Status],0
		103	jne fdc_status_error_1
		104	mov edi,edx
		105	dec ebx
		106	shl ebx,9
380	serge	107	mov esi,FLOPPY_BUFF
1	ha	108	add esi,ebx
		109	shl ecx,9
		110	cld
		111	rep movsb
		112	mov eax,0 ; ok read
		113	mov ebx,0
		114	mov [flp_status],0
		115	ret
		116	fdc_status_error_1:
		117	mov [flp_status],0
131	diamond	118	mov eax,10
1	ha	119	mov ebx,-1
		120	ret
		121
		122	fr_noroot_1:
		123	sub esp,32
		124	call expand_filename
		125	frfloppy_1:
		126	cmp ebx,0
		127	jne frfl5_1
		128	mov ebx,1
		129	frfl5_1:
		130	cmp ecx,0
		131	jne frfl6_1
		132	mov ecx,1
		133	frfl6_1:
		134	dec ebx
		135	push eax
		136	push eax ebx ecx edx esi edi
		137	call read_flp_fat
		138	cmp [FDC_Status],0
		139	jne fdc_status_error_3_1
		140	mov [FDD_Track],0 ; ��
		141	mov [FDD_Head],1 ; ��
		142	mov [FDD_Sector],2 ; ��
		143	call SeekTrack
		144	mov dh,14
		145	l.20_1:
		146	call ReadSectWithRetr
		147	cmp [FDC_Status],0
		148	jne fdc_status_error_3_1
		149	mov dl,16
380	serge	150	mov edi,FDD_BUFF
1	ha	151	inc [FDD_Sector]
		152	l.21_1:
		153	mov esi,eax ;Name of file we want
		154	mov ecx,11
		155	cld
		156	rep cmpsb ;Found the file?
		157	je fifound_1 ;Yes
		158	add ecx,21
		159	add edi, ecx ;Advance to next entry
		160	dec dl
		161	cmp dl,0
		162	jne l.21_1
		163	dec dh
		164	cmp dh,0
		165	jne l.20_1
		166	fdc_status_error_3:
		167	mov eax,5 ; file not found ?
		168	mov ebx,-1
		169	add esp,32+28
		170	mov [flp_status],0
		171	ret
		172	fdc_status_error_3_2:
		173	cmp [FDC_Status],0
		174	je fdc_status_error_3
		175	fdc_status_error_3_1:
		176	add esp,32+28
		177	jmp fdc_status_error_1
		178
		179	fifound_1:
		180	mov eax,[path_pointer_flp]
		181	cmp [eax+36],byte 0
		182	je fifound_2
		183	add edi,0xf
		184	mov eax,[edi]
		185	and eax,65535
		186	mov ebx,[path_pointer_flp]
		187	add ebx,36
		188	call get_cluster_of_a_path_flp
		189	jc fdc_status_error_3_2
		190	mov ebx,[ebx-11+28] ;file size
		191	mov [esp+20],ebx
		192	mov [esp+24],ebx
		193	jmp fifound_3
		194	fifound_2:
		195	mov ebx,[edi-11+28] ;file size
		196	mov [esp+20],ebx
		197	mov [esp+24],ebx
		198	add edi,0xf
		199	mov eax,[edi]
		200	fifound_3:
		201	and eax,65535
		202	mov [n_sector],eax ;eax=cluster
		203	frnew_1:
		204	add eax,31 ;bootsector+2*fat+filenames
		205	cmp [esp+16],dword 0 ; wanted cluster ?
		206	jne frfl7_1
		207	call read_chs_sector
		208	cmp [FDC_Status],0
		209	jne fdc_status_error_5
		210	mov edi,[esp+8]
		211	call give_back_application_data_1
		212	add [esp+8],dword 512
		213	dec dword [esp+12] ; last wanted cluster ?
		214	cmp [esp+12],dword 0
		215	je frnoread_1
		216	jmp frfl8_1
		217	frfl7_1:
		218	dec dword [esp+16]
		219	frfl8_1:
		220	mov edi,[n_sector]
		221	shl edi,1 ;find next cluster from FAT
381	serge	222	add edi,FLOPPY_FAT
1	ha	223	mov eax,[edi]
		224	and eax,4095
		225	mov edi,eax
		226	mov [n_sector],edi
		227	cmp edi,4095 ;eof - cluster
		228	jz frnoread2_1
		229	cmp [esp+24],dword 512 ;eof - size
		230	jb frnoread_1
		231	sub [esp+24],dword 512
		232	jmp frnew_1
		233
131	diamond	234	read_chs_sector:
1	ha	235	call calculate_chs
		236	call ReadSectWithRetr
		237	ret
		238
		239	frnoread2_1:
		240	cmp [esp+16],dword 0 ; eof without read ?
		241	je frnoread_1
		242	mov [fdc_irq_func],fdc_null
		243	pop edi esi edx ecx
		244	add esp,4
		245	pop ebx ; ebx <- eax : size of file
		246	add esp,36
		247	mov eax,6 ; end of file
		248	mov [flp_status],0
		249	ret
		250
		251	frnoread_1:
		252	pop edi esi edx ecx
		253	add esp,4
		254	pop ebx ; ebx <- eax : size of file
		255	add esp,36
		256	mov eax,0
		257	mov [flp_status],0
		258	ret
		259
		260	fdc_status_error_5:
		261	pop edi esi edx ecx
		262	add esp,4
		263	pop ebx ; ebx <- eax : size of file
		264	add esp,36
		265	jmp fdc_status_error_1
		266
		267	read_flp_root:
		268	pusha
		269	call check_label
		270	cmp [FDC_Status],0
		271	jne unnecessary_root_read
		272	cmp [root_read],1
		273	je unnecessary_root_read
		274	mov [FDD_Track],0 ; ��
		275	mov [FDD_Head],1 ; ��
131	diamond	276	mov [FDD_Sector],2 ; ��
380	serge	277	mov edi,FLOPPY_BUFF
1	ha	278	call SeekTrack
		279	read_flp_root_1:
		280	call ReadSectWithRetr
		281	cmp [FDC_Status],0
		282	jne unnecessary_root_read
		283	push edi
		284	call give_back_application_data_1
		285	pop edi
		286	add edi,512
		287	inc [FDD_Sector]
		288	cmp [FDD_Sector],16
		289	jne read_flp_root_1
		290	mov [root_read],1
		291	unnecessary_root_read:
		292	popa
		293	ret
		294
		295
		296	read_flp_fat:
		297	pusha
		298	call check_label
		299	cmp [FDC_Status],0
		300	jne unnecessary_flp_fat
		301	cmp [flp_fat],1
		302	je unnecessary_flp_fat
		303	mov [FDD_Track],0 ; ��
		304	mov [FDD_Head],0 ; ��
131	diamond	305	mov [FDD_Sector],2 ; ��
380	serge	306	mov edi,FLOPPY_BUFF
1	ha	307	call SeekTrack
		308	read_flp_fat_1:
		309	call ReadSectWithRetr
		310	cmp [FDC_Status],0
		311	jne unnecessary_flp_fat
		312	push edi
		313	call give_back_application_data_1
		314	pop edi
		315	add edi,512
		316	inc [FDD_Sector]
		317	cmp [FDD_Sector],19
		318	jne read_flp_fat_1
		319	mov [FDD_Sector],1
		320	mov [FDD_Head],1
		321	call ReadSectWithRetr
		322	cmp [FDC_Status],0
		323	jne unnecessary_flp_fat
		324	call give_back_application_data_1
		325	call calculatefatchain_flp
		326	mov [root_read],0
		327	mov [flp_fat],1
		328	unnecessary_flp_fat:
		329	popa
		330	ret
		331
		332	calculatefatchain_flp:
		333	pushad
		334
380	serge	335	mov esi,FLOPPY_BUFF
381	serge	336	mov edi,FLOPPY_FAT
1	ha	337
		338	fcnew_1:
		339	mov eax,dword [esi]
		340	mov ebx,dword [esi+4]
		341	mov ecx,dword [esi+8]
		342	mov edx,ecx
		343	shr edx,4 ;8 ok
		344	shr dx,4 ;7 ok
		345	xor ch,ch
		346	shld ecx,ebx,20 ;6 ok
		347	shr cx,4 ;5 ok
		348	shld ebx,eax,12
		349	and ebx,0x0fffffff ;4 ok
		350	shr bx,4 ;3 ok
		351	shl eax,4
		352	and eax,0x0fffffff ;2 ok
		353	shr ax,4 ;1 ok
		354	mov dword [edi],eax
		355	add edi,4
		356	mov dword [edi],ebx
		357	add edi,4
		358	mov dword [edi],ecx
		359	add edi,4
		360	mov dword [edi],edx
131	diamond	361	add edi,4
1	ha	362	add esi,12
		363
381	serge	364	cmp edi,FLOPPY_FAT+2856*2 ;2849 clusters
1	ha	365	jnz fcnew_1
		366
		367	popad
		368	ret
131	diamond	369
1	ha	370	check_label:
		371	pushad
		372	mov [FDD_Track],0 ; ��
		373	mov [FDD_Head],0 ; ��
131	diamond	374	mov [FDD_Sector],1 ; ��
1	ha	375	call SetUserInterrupts
		376	call FDDMotorON
		377	call RecalibrateFDD
		378	cmp [FDC_Status],0
		379	jne fdc_status_error
		380	call SeekTrack
		381	cmp [FDC_Status],0
		382	jne fdc_status_error
		383	call ReadSectWithRetr
		384	cmp [FDC_Status],0
131	diamond	385	jne fdc_status_error
1	ha	386	mov esi,flp_label
380	serge	387	mov edi,FDD_BUFF+39
1	ha	388	mov ecx,15
		389	cld
131	diamond	390	rep cmpsb
1	ha	391	je same_label
		392	mov [root_read],0
		393	mov [flp_fat],0
		394	same_label:
380	serge	395	mov esi,FDD_BUFF+39
1	ha	396	mov edi,flp_label
		397	mov ecx,15
		398	cld
		399	rep movsb
		400	popad
		401	ret
		402	fdc_status_error:
		403	popad
		404	ret
		405
		406	save_flp_root:
		407	pusha
		408	call check_label
		409	cmp [FDC_Status],0
		410	jne unnecessary_root_save
		411	cmp [root_read],0
		412	je unnecessary_root_save
		413	mov [FDD_Track],0 ; ��
		414	mov [FDD_Head],1 ; ��
131	diamond	415	mov [FDD_Sector],2 ; ��
380	serge	416	mov esi,FLOPPY_BUFF
1	ha	417	call SeekTrack
		418	save_flp_root_1:
		419	push esi
		420	call take_data_from_application_1
		421	pop esi
		422	add esi,512
		423	call WriteSectWithRetr
		424	cmp [FDC_Status],0
		425	jne unnecessary_root_save
		426	inc [FDD_Sector]
		427	cmp [FDD_Sector],16
		428	jne save_flp_root_1
		429	unnecessary_root_save:
		430	mov [fdc_irq_func],fdc_null
		431	popa
		432	ret
131	diamond	433
1	ha	434	save_flp_fat:
		435	pusha
		436	call check_label
		437	cmp [FDC_Status],0
		438	jne unnecessary_flp_fat_save
		439	cmp [flp_fat],0
		440	je unnecessary_flp_fat_save
		441	call restorefatchain_flp
		442	mov [FDD_Track],0 ; ��
		443	mov [FDD_Head],0 ; ��
131	diamond	444	mov [FDD_Sector],2 ; ��
380	serge	445	mov esi,FLOPPY_BUFF
1	ha	446	call SeekTrack
		447	save_flp_fat_1:
		448	push esi
		449	call take_data_from_application_1
		450	pop esi
		451	add esi,512
		452	call WriteSectWithRetr
		453	cmp [FDC_Status],0
		454	jne unnecessary_flp_fat_save
		455	inc [FDD_Sector]
		456	cmp [FDD_Sector],19
		457	jne save_flp_fat_1
		458	mov [FDD_Sector],1
		459	mov [FDD_Head],1
		460	call take_data_from_application_1
		461	call WriteSectWithRetr
		462	cmp [FDC_Status],0
		463	jne unnecessary_flp_fat_save
		464	mov [root_read],0
		465	unnecessary_flp_fat_save:
		466	mov [fdc_irq_func],fdc_null
		467	popa
		468	ret
		469
131	diamond	470
1	ha	471	restorefatchain_flp: ; restore fat chain
		472	pushad
		473
381	serge	474	mov esi,FLOPPY_FAT
380	serge	475	mov edi,FLOPPY_BUFF
1	ha	476
		477	fcnew2_1:
		478	mov eax,dword [esi]
		479	mov ebx,dword [esi+4]
		480	shl ax,4
		481	shl eax,4
		482	shl bx,4
		483	shr ebx,4
		484	shrd eax,ebx,8
		485	shr ebx,8
		486	mov dword [edi],eax
		487	add edi,4
		488	mov word [edi],bx
		489	add edi,2
		490	add esi,8
		491
380	serge	492	cmp edi,FLOPPY_BUFF+0x1200 ;4274 bytes - all used FAT
1	ha	493	jb fcnew2_1
		494
380	serge	495	mov esi,FLOPPY_BUFF ; duplicate fat chain
		496	mov edi,FLOPPY_BUFF+0x1200
1	ha	497	mov ecx,0x1200/4
		498	cld
		499	rep movsd
		500
		501	popad
		502	ret
		503
		504
		505	floppy_filedelete:
		506	;--------------------------------------------
		507	;
		508	; filedelete - sys floppy
		509	; in:
		510	; eax - filename 11 chars - for root directory
		511	; edi pointer to path /fd/1/...... - for all files in nested directories
		512	;
		513	; out:
		514	; eax - 0 = successful, 1 = file not found, 10 = access denied
		515	;
		516	;--------------------------------------------
		517	mov [path_pointer_flp],edi
		518	mov [save_flag],0
		519	mov ebp,1 ; file not found as default
		520	filedelete_newtry_1:
		521	sub esp,32
		522	call expand_filename
		523	push eax ebx ecx edx esi edi
		524	call read_flp_fat
		525	cmp [FDC_Status],0
		526	jne frnoreadd_1
		527	mov [FDD_Track],0 ; ��
		528	mov [FDD_Head],1 ; ��
		529	mov [FDD_Sector],2 ; ��
		530	call SeekTrack
		531	mov dh,14
		532	l.20_2:
		533	call ReadSectWithRetr
		534	cmp [FDC_Status],0
		535	jne fdc_status_error_4
		536	mov dl,16
380	serge	537	mov edi,FDD_BUFF
1	ha	538	inc [FDD_Sector]
		539	l.21_2:
		540	mov esi,eax ;Name of file we want
		541	mov ecx,11
		542	cld
		543	rep cmpsb ;Found the file?
		544	je fifoundd_1 ;Yes
		545	add ecx,21
		546	add edi, ecx ;Advance to next entry
		547	dec dl
		548	jne l.21_2
		549	dec dh
		550	jne l.20_2
		551	jmp frnoreadd_1
		552
		553	fdc_status_error_4:
		554	pop edi esi edx ecx ebx eax
		555	add esp,32
		556	jmp fdc_status_error_1
		557
		558	fifoundd_1:
		559	mov eax,[path_pointer_flp]
		560	cmp [eax+36],byte 0
		561	je fifoundd_2
83	diamond	562	movzx eax, word [edi+0xf]
1	ha	563	mov ebx,[path_pointer_flp]
		564	add ebx,36
		565	call get_cluster_of_a_path_flp
131	diamond	566	jc frnoreadd_1_1
1	ha	567	mov edi,ebx
		568	add edi,11
		569	jmp fifoundd_2_1
		570	fifoundd_2:
		571	dec [FDD_Sector]
		572	fifoundd_2_1:
		573	mov [edi-11],byte 0xE5 ;mark filename deleted
83	diamond	574	movzx edi, word [edi+0xf] ;edi = cluster
1	ha	575	frnewd_1:
		576	shl edi,1 ;find next cluster from FAT
381	serge	577	add edi,FLOPPY_FAT
1	ha	578	mov eax,[edi]
		579	mov [edi],word 0x0 ;clear fat chain cluster
		580	and eax,4095
		581	mov edi,eax
		582	cmp edi,dword 4095 ;last cluster ?
		583	jz frnoreadd2_1
		584	jmp frnewd_1
		585
		586	frnoreadd2_1:
		587	call WriteSectWithRetr
		588	cmp [FDC_Status],0
		589	jne fdc_status_error_4
		590	call save_flp_fat
		591	cmp [FDC_Status],0
		592	jne fdc_status_error_4
		593	; pop edi esi edx ecx ebx eax
		594	; add esp,32
		595	mov ebp,0 ; file found
		596	; jmp filedelete_newtry_1
		597	jmp frnoreadd_1
		598
		599	frnoreadd_1_1:
		600	cmp [FDC_Status],0
		601	jne fdc_status_error_4
		602	frnoreadd_1:
		603	pop edi esi edx ecx ebx eax
		604	add esp,32
		605	mov eax,ebp
		606	ret
		607
		608	floppy_filesave:
		609	;----------------------------------------------------------
		610	;
		611	; filesave - sys floppy
		612	;
		613	; eax ; pointer to file name 11 chars - for root directory
		614	; ebx ; buffer
		615	; ecx ; count to write in bytes
		616	; edx ; 0 create new , 1 append
		617	; edi pointer to path /fd/1/...... - for all files in nested directories
		618	;
		619	; output : eax = 0 - ok
131	diamond	620	; 5 - file not found / directory not found
1	ha	621	; 8 - disk full
		622	; 10 - access denied
		623	;-----------------------------------------------------------
		624	mov [path_pointer_flp],edi
		625	sub esp,32
		626	call expand_filename
		627	cmp edx,0
		628	jnz fsdel_1
		629	pusha
		630	call floppy_filedelete
		631	cmp [FDC_Status],0
		632	jne fdc_status_error_6
		633	popa
		634	mov [save_flag],1
		635	fsdel_1:
		636	call floppy_free_space
		637	cmp [FDC_Status],0
		638	jne fdc_status_error_6
		639	cmp ecx,edi
		640	jb rd_do_save_1
		641	add esp,32
		642	mov eax,8 ; not enough free space
		643	mov [flp_status],0
		644	ret
		645
		646	fdc_status_error_6:
131	diamond	647	popa
1	ha	648	add esp,32
		649	jmp fdc_status_error_1
131	diamond	650
1	ha	651	rd_do_save_1:
		652	push eax ebx ecx edx esi edi
		653	call read_flp_fat
		654	cmp [FDC_Status],0
		655	jne fdc_status_error_7
		656	push eax
		657	mov eax,[path_pointer_flp]
		658	cmp [eax+36],byte 0
		659	jne fifoundds_2
		660	pop eax
		661	mov [save_root_flag],1
		662	call read_flp_root
		663	cmp [FDC_Status],0
		664	jne fdc_status_error_7
380	serge	665	mov edi,FLOPPY_BUFF ;Point at directory
1	ha	666	mov edx,224 +1
		667	; find an empty spot for filename in the root dir
		668	l20ds_1:
		669	sub edx,1
83	diamond	670	jz frnoreadds_1
1	ha	671	l21ds_1:
		672	cmp [edi],byte 0xE5
		673	jz fifoundds_1
		674	cmp [edi],byte 0x0
		675	jz fifoundds_1
		676	add edi,32 ; Advance to next entry
		677	jmp l20ds_1
		678
		679	fifoundds_2:
		680	pop eax
		681	mov [save_root_flag],0
		682	mov [FDD_Track],0 ; ��
		683	mov [FDD_Head],1 ; ��
		684	mov [FDD_Sector],2 ; ��
		685	call SeekTrack
		686	mov dh,14
		687	l.20_3:
		688	call ReadSectWithRetr
		689	cmp [FDC_Status],0
		690	jne fdc_status_error_7
		691	mov dl,16
380	serge	692	mov edi,FDD_BUFF
1	ha	693	inc [FDD_Sector]
		694	l.21_3:
		695	mov esi,eax ;Name of file we want
		696	mov ecx,11
		697	cld
		698	rep cmpsb ;Found the file?
		699	je fifoundds_3 ;Yes
		700	add ecx,21
		701	add edi, ecx ;Advance to next entry
		702	dec dl
		703	jne l.21_3
		704	dec dh
		705	jne l.20_3
		706	fdc_status_error_8:
		707	pop edi esi edx ecx ebx eax
		708	mov eax,5 ; file not found ?
		709	mov ebx,-1
		710	add esp,32
		711	mov [flp_status],0
		712	ret
		713
		714	fifoundds_3:
		715	add edi,0xf
		716	mov eax,[edi]
		717	and eax,65535
		718	mov ebx,[path_pointer_flp]
		719	add ebx,36
		720	call get_cluster_of_a_path_flp
		721	jc fdc_status_error_7_1
		722	found_directory_for_writing_flp:
		723	call analyze_directory_to_write_flp
		724	jc fdc_status_error_7_1
		725	mov edi,ebx
		726	fifoundds_1:
		727	push edi ; move the filename to root dir
		728	mov esi,[esp+4+20]
		729	cmp [save_root_flag],0
		730	jne fifoundds_4
		731	mov esi,[pointer_file_name_flp]
		732	fifoundds_4:
		733	mov ecx,11
		734	cld
		735	rep movsb
		736	pop edi
		737	mov edx,edi
		738	add edx,11+0xf ; edx <- cluster save position
		739	mov ebx,[esp+12] ; save file size
		740	mov [edi+28],ebx
		741	mov [edi+11],byte 0x20 ; attribute
		742	call get_date_for_file ; from FAT32.INC
		743	mov [edi+24],ax ; date
		744	mov [edi+18],ax ; date
		745	call get_time_for_file ; from FAT32.INC
		746	mov [edi+22],ax ; time
		747	xor ax,ax
		748	mov [edi+20],ax
		749	mov ebx,1 ; first cluster
		750	cmp [save_root_flag],0
		751	jne frnewds_1
131	diamond	752	call frnewds_2
1	ha	753	pusha
		754	call WriteSectWithRetr
		755	popa
		756	cmp [FDC_Status],0
		757	jne fdc_status_error_7
		758	jmp frnewds_3
		759
		760	frnewds_1:
		761	call frnewds_2
		762	frnewds_3:
		763	pusha ; move save to floppy cluster
		764	add ebx,31
		765	mov eax,ebx
		766	mov esi,[esp+32+16]
		767	call take_data_from_application_1
		768	call save_chs_sector
		769	cmp [FDC_Status],0
		770	jne fdc_status_error_7
		771	popa
		772	mov eax,[esp+12]
		773	cmp eax,512
		774	jb flnsa_1
		775	sub eax,512
		776	mov [esp+12],eax
		777	mov eax,[esp+16]
		778	add eax,512
		779	mov [esp+16],eax
		780	jmp frnewds_1
		781
		782	frnewds_2:
		783	add ebx,1
		784	mov edi,ebx ; find free cluster in FAT
		785	shl edi,1
381	serge	786	add edi,FLOPPY_FAT
1	ha	787	mov eax,[edi]
		788	and eax,4095
		789	jnz frnewds_2
		790	mov [edx],bx ; save next cluster pos. to prev cl.
		791	mov edx,edi ; next save pos abs mem add
		792	ret
		793
		794	flnsa_1:
		795	mov [edi],word 4095 ; mark end of file - last cluster
		796	cmp [save_root_flag],1
		797	jne flnsa_2
		798	call save_flp_root
		799	cmp [FDC_Status],0
		800	jne fdc_status_error_7
		801	flnsa_2:
		802	call save_flp_fat
		803	cmp [FDC_Status],0
		804	jne fdc_status_error_7
		805	frnoreadds_1:
		806	pop edi esi edx ecx ebx eax
		807	add esp,32
		808	mov eax,0
		809	mov [flp_status],0
		810	ret
		811
		812	fdc_status_error_7_1:
		813	cmp [FDC_Status],0
131	diamond	814	je fdc_status_error_8
1	ha	815	fdc_status_error_7:
		816	pop edi esi edx ecx ebx eax
		817	add esp,32
		818	jmp fdc_status_error_1
		819
		820	save_chs_sector:
		821	call calculate_chs
		822	call WriteSectWithRetr
		823	ret
131	diamond	824
1	ha	825	calculate_chs:
		826	mov bl,[FDD_Track]
131	diamond	827	mov [old_track],bl
1	ha	828	mov ebx,18
		829	xor edx,edx
		830	div ebx
		831	inc edx
		832	mov [FDD_Sector],dl
		833	xor edx,edx
		834	mov ebx,2
		835	div ebx
		836	mov [FDD_Track],al
		837	mov [FDD_Head],0
		838	cmp edx,0
		839	je no_head_2
		840	inc [FDD_Head]
		841	no_head_2:
		842	mov dl,[old_track]
		843	cmp dl,[FDD_Track]
		844	je no_seek_track_1
		845	call SeekTrack
		846	no_seek_track_1:
		847	ret
		848
131	diamond	849
1	ha	850	get_cluster_of_a_path_flp:
		851	;---------------------------------------------------------
		852	; input : EBX = pointer to a path string
		853	; (example: the path "/files/data/document" become
		854	; "files......data.......document...0"
		855	; '.' = space char
		856	; '0' = char(0) (ASCII=0) !!! )
		857	; output : if (CARRY=1) -> ERROR in the PATH
		858	; if (CARRY=0) -> EAX=cluster
		859	;---------------------------------------------------------
		860
		861	push edx
		862	mov edx,ebx
		863
		864	search_end_of_path_flp:
		865	cmp [save_flag],0
		866	jne search_end_of_path_flp_1
		867	cmp byte [edx],0
		868	je found_end_of_path_flp
		869	jmp search_end_of_path_flp_2
		870	search_end_of_path_flp_1:
		871	cmp byte [edx+12],0
		872	je found_end_of_path_flp
		873	search_end_of_path_flp_2:
		874	inc edx ; '/'
		875	call analyze_directory_flp
		876	jc directory_not_found_flp
		877
		878	mov eax,[ebx+20-2] ; read the HIGH 16bit cluster field
		879	mov ax,[ebx+26] ; read the LOW 16bit cluster field
		880	and eax,0xfff ;[fatMASK]
		881	add edx,11 ; 8+3 (name+extension)
		882	jmp search_end_of_path_flp
		883
		884	found_end_of_path_flp:
		885	inc edx
		886	mov [pointer_file_name_flp],edx
		887	pop edx
		888	clc ; no errors
		889	ret
		890
		891	directory_not_found_flp:
		892	pop edx
		893	stc ; errors occour
		894	ret
131	diamond	895
1	ha	896	analyze_directory_flp:
		897	;--------------------------------
		898	; input : EAX = first cluster of the directory
		899	; EBX = pointer to filename
		900	; output : IF CARRY=0 EAX = sector where th file is found
		901	; EBX = pointer in buffer
		902	; [buffer .. buffer+511]
		903	; ECX,EDX,EDI,EDI not changed
		904	; IF CARRY=1
		905	;--------------------------------
		906	push ebx ;[esp+16]
		907	push ecx
		908	push edx
		909	push esi
		910	push edi
131	diamond	911
		912
1	ha	913	adr56_flp:
		914	mov [clust_tmp_flp],eax
		915	add eax,31
		916	pusha
		917	call read_chs_sector
		918	popa
		919	cmp [FDC_Status],0
		920	jne not_found_file_analyze_flp
		921
		922	mov ecx,512/32
380	serge	923	mov ebx,FDD_BUFF
131	diamond	924
1	ha	925	adr1_analyze_flp:
		926	mov esi,edx ;[esp+16]
		927	mov edi,ebx
		928	cld
		929	push ecx
		930	mov ecx,11
		931	rep cmpsb
		932	pop ecx
		933	je found_file_analyze_flp
131	diamond	934
1	ha	935	add ebx,32
		936	loop adr1_analyze_flp
131	diamond	937
1	ha	938	mov eax,[clust_tmp_flp]
		939	shl eax,1 ;find next cluster from FAT
381	serge	940	add eax,FLOPPY_FAT
1	ha	941	mov eax,[eax]
		942	and eax,4095
		943	cmp eax,0x0ff8
		944	jb adr56_flp
131	diamond	945	not_found_file_analyze_flp:
1	ha	946	pop edi
		947	pop esi
		948	pop edx
		949	pop ecx
		950	add esp,4
		951	stc ;file not found
		952	ret
131	diamond	953
1	ha	954	found_file_analyze_flp:
		955	pop edi
		956	pop esi
		957	pop edx
		958	pop ecx
		959	add esp,4
		960	clc ;file found
		961	ret
131	diamond	962
		963
1	ha	964	analyze_directory_to_write_flp:
		965	;--------------------------------
		966	; input : EAX = first cluster of the directory
		967	; output : IF CARRY=0 EAX = sector where the file is found
		968	; EBX = pointer in buffer
		969	; [buffer .. buffer+511]
		970	; ECX,EDX,EDI,EDI not changed
		971	; IF CARRY=1
		972	;--------------------------------
131	diamond	973
1	ha	974	push ecx
		975	push edx
		976	push esi
131	diamond	977
1	ha	978	adr561:
		979	mov [clust_tmp_flp],eax
		980	add eax,31
		981	pusha
131	diamond	982	call read_chs_sector
1	ha	983	popa
		984	cmp [FDC_Status],0
		985	jne error_found_file_analyze1
		986
		987	mov ecx,512/32
380	serge	988	mov ebx,FDD_BUFF
131	diamond	989
1	ha	990	adr1_analyze1:
		991	cmp byte [ebx],0x00
		992	je found_file_analyze1
		993	cmp byte [ebx],0xe5
		994	je found_file_analyze1
131	diamond	995
1	ha	996	avanti:
		997	add ebx,32
		998	loop adr1_analyze1
131	diamond	999
1	ha	1000	mov eax,[clust_tmp_flp]
		1001	shl eax,1 ;find next cluster from FAT
381	serge	1002	add eax,FLOPPY_FAT
1	ha	1003	mov eax,[eax]
		1004	and eax,4095
		1005	cmp eax,0x0ff8
		1006	jb adr561
131	diamond	1007
1	ha	1008	call get_free_FAT ;this block of code add a new cluster
		1009	;for the directory because the directory
		1010	;is full
		1011
		1012	mov [edi],word 0x0fff
131	diamond	1013
1	ha	1014	mov eax,[clust_tmp_flp]
		1015	shl eax,1 ;find next cluster from FAT
381	serge	1016	add eax,FLOPPY_FAT
		1017	sub edi,FLOPPY_FAT
1	ha	1018	mov [eax],di
		1019
		1020	pusha
		1021	mov ecx,512/4
		1022	xor eax,eax
380	serge	1023	mov edi,FDD_BUFF
1	ha	1024	cld
		1025	rep stosd
		1026	popa
		1027
		1028	mov eax,edi
		1029	add eax,31
		1030	pusha
131	diamond	1031	call save_chs_sector
1	ha	1032	popa
		1033	cmp [FDC_Status],0
		1034	jne error_found_file_analyze1
380	serge	1035	mov ebx,FDD_BUFF
1	ha	1036
		1037	found_file_analyze1:
131	diamond	1038
1	ha	1039	pop esi
		1040	pop edx
		1041	pop ecx
		1042	clc ;file found
		1043	ret
		1044
		1045	error_found_file_analyze1:
		1046	pop esi
		1047	pop edx
		1048	pop ecx
		1049	stc
131	diamond	1050	ret
		1051
1	ha	1052	get_free_FAT_flp:
		1053	;------------------------------------------
		1054	; input : EAX = # cluster for start the searching
		1055	; output : EAX = # first cluster found free
		1056	;-------------------------------------------
		1057	push ebx
131	diamond	1058
1	ha	1059	mov ebx,1
		1060	check_new_flp:
		1061	add ebx,1
		1062	mov edi,ebx ; find free cluster in FAT
		1063	shl edi,1
381	serge	1064	add edi,FLOPPY_FAT
1	ha	1065	mov eax,[edi]
		1066	and eax,4095
		1067	cmp eax,0x0
		1068	jnz check_new_flp
		1069
		1070	pop ebx
		1071	ret
71	diamond	1072
		1073	; \begin{diamond}
83	diamond	1074	fat_find_lfn:
71	diamond	1075	; in: esi->name
83	diamond	1076	; [esp+4] = next
		1077	; [esp+8] = first
		1078	; [esp+C]... - possibly parameters for first and next
71	diamond	1079	; out: CF=1 - file not found
83	diamond	1080	; else CF=0, esi->next name component, edi->direntry
75	diamond	1081	pusha
83	diamond	1082	lea eax, [esp+0Ch+20h]
		1083	call dword [eax-4]
		1084	jc .reterr
75	diamond	1085	sub esp, 262*2 ; reserve place for LFN
		1086	mov ebp, esp
		1087	push 0 ; for fat_get_name: read ASCII name
83	diamond	1088	.l1:
75	diamond	1089	call fat_get_name
83	diamond	1090	jc .l2
75	diamond	1091	call fat_compare_name
		1092	jz .found
83	diamond	1093	.l2:
		1094	lea eax, [esp+0Ch+20h+262*2+4]
		1095	call dword [eax-8]
		1096	jnc .l1
75	diamond	1097	add esp, 262*2+4
83	diamond	1098	.reterr:
		1099	stc
75	diamond	1100	popa
		1101	ret
71	diamond	1102	.found:
83	diamond	1103	add esp, 262*2+4
		1104	; if this is LFN entry, advance to true entry
75	diamond	1105	cmp byte [edi+11], 0xF
83	diamond	1106	jnz @f
		1107	lea eax, [esp+0Ch+20h]
		1108	call dword [eax-8]
		1109	jc .reterr
		1110	@@:
		1111	add esp, 8 ; CF=0
		1112	push esi
		1113	push edi
		1114	popa
		1115	ret
		1116
171	diamond	1117	uglobal
		1118	; this is for delete support
		1119	fd_prev_sector dd ?
		1120	fd_prev_prev_sector dd ?
		1121	endg
		1122
83	diamond	1123	flp_root_next:
		1124	cmp edi, 0xD200-0x20
		1125	jae @f
75	diamond	1126	add edi, 0x20
83	diamond	1127	ret ; CF=0
		1128	@@:
		1129	; read next sector
		1130	inc dword [eax]
		1131	cmp dword [eax], 14
		1132	jae flp_root_first.readerr
171	diamond	1133	push [fd_prev_sector]
		1134	pop [fd_prev_prev_sector]
		1135	push eax
		1136	mov eax, [eax]
		1137	add eax, 19-1
		1138	mov [fd_prev_sector], eax
		1139	pop eax
83	diamond	1140	flp_root_first:
		1141	mov eax, [eax]
		1142	pusha
		1143	add eax, 19
75	diamond	1144	call read_chs_sector
83	diamond	1145	popa
75	diamond	1146	cmp [FDC_Status], 0
83	diamond	1147	jnz .readerr
380	serge	1148	mov edi, FDD_BUFF
83	diamond	1149	ret ; CF=0
		1150	.readerr:
		1151	stc
		1152	ret
		1153
		1154	flp_rootmem_first:
380	serge	1155	mov edi, FLOPPY_BUFF
83	diamond	1156	clc
		1157	ret
		1158	flp_rootmem_next:
		1159	add edi, 0x20
380	serge	1160	cmp edi, FLOPPY_BUFF+14*0x200
83	diamond	1161	cmc
		1162	flp_rootmem_next_write:
		1163	flp_rootmem_begin_write:
		1164	flp_rootmem_end_write:
		1165	ret
		1166	flp_rootmem_extend_dir:
		1167	stc
		1168	ret
		1169
		1170	flp_notroot_next:
		1171	cmp edi, 0xD200-0x20
		1172	jae flp_notroot_next_sector
		1173	add edi, 0x20
		1174	ret ; CF=0
		1175	flp_notroot_next_sector:
		1176	push ecx
		1177	mov ecx, [eax]
171	diamond	1178	push [fd_prev_sector]
		1179	pop [fd_prev_prev_sector]
		1180	add ecx, 31
		1181	mov [fd_prev_sector], ecx
381	serge	1182	mov ecx, [(ecx-31)*2+FLOPPY_FAT]
83	diamond	1183	and ecx, 0xFFF
		1184	cmp ecx, 2849
		1185	jae flp_notroot_first.err2
		1186	mov [eax], ecx
		1187	pop ecx
		1188	flp_notroot_first:
		1189	mov eax, [eax]
		1190	cmp eax, 2
		1191	jb .err
		1192	cmp eax, 2849
		1193	jae .err
		1194	pusha
75	diamond	1195	add eax, 31
83	diamond	1196	call read_chs_sector
		1197	popa
380	serge	1198	mov edi, FDD_BUFF
83	diamond	1199	cmp [FDC_Status], 0
		1200	jnz .err
		1201	ret ; CF=0
		1202	.err2:
		1203	pop ecx
		1204	.err:
		1205	stc
75	diamond	1206	ret
83	diamond	1207	flp_notroot_begin_write:
		1208	pusha
		1209	mov eax, [eax]
		1210	add eax, 31
		1211	call read_chs_sector
		1212	popa
		1213	ret
		1214	flp_notroot_end_write:
		1215	pusha
		1216	mov eax, [eax]
		1217	add eax, 31
		1218	call save_chs_sector
		1219	popa
		1220	ret
		1221	flp_notroot_next_write:
		1222	cmp edi, 0xD200
		1223	jae @f
		1224	ret
		1225	@@:
		1226	call flp_notroot_end_write
		1227	jmp flp_notroot_next_sector
		1228	flp_notroot_extend_dir:
		1229	; find free cluster in FAT
		1230	pusha
		1231	xor eax, eax
381	serge	1232	mov edi, FLOPPY_FAT
83	diamond	1233	mov ecx, 2849
		1234	repnz scasw
		1235	jnz .notfound
		1236	mov word [edi-2], 0xFFF ; mark as last cluster
381	serge	1237	sub edi, FLOPPY_FAT
83	diamond	1238	shr edi, 1
		1239	dec edi
		1240	mov eax, [esp+28]
		1241	mov ecx, [eax]
381	serge	1242	mov [FLOPPY_FAT+ecx*2], di
83	diamond	1243	mov [eax], edi
		1244	xor eax, eax
380	serge	1245	mov edi, FDD_BUFF
83	diamond	1246	mov ecx, 128
		1247	rep stosd
		1248	popa
		1249	call flp_notroot_end_write
380	serge	1250	mov edi, FDD_BUFF
83	diamond	1251	clc
		1252	ret
		1253	.notfound:
		1254	popa
		1255	stc
		1256	ret
71	diamond	1257
83	diamond	1258	fd_find_lfn:
		1259	; in: esi->name
		1260	; out: CF=1 - file not found
86	diamond	1261	; else CF=0 and edi->direntry, eax=directory cluster (0 for root)
83	diamond	1262	push esi edi
		1263	push 0
		1264	push flp_root_first
		1265	push flp_root_next
		1266	.loop:
		1267	call fat_find_lfn
		1268	jc .notfound
		1269	cmp byte [esi], 0
		1270	jz .found
		1271	test byte [edi+11], 10h
		1272	jz .notfound
		1273	movzx eax, word [edi+26] ; cluster
		1274	mov [esp+8], eax
		1275	mov dword [esp+4], flp_notroot_first
		1276	mov dword [esp], flp_notroot_next
		1277	jmp .loop
		1278	.notfound:
		1279	add esp, 12
		1280	pop edi esi
		1281	stc
		1282	ret
		1283	.found:
86	diamond	1284	mov eax, [esp+8]
131	diamond	1285	add eax, 31
		1286	cmp dword [esp], flp_root_next
		1287	jnz @f
		1288	add eax, -31+19
		1289	@@:
83	diamond	1290	add esp, 16 ; CF=0
		1291	pop esi
		1292	ret
		1293
71	diamond	1294	;----------------------------------------------------------------
		1295	;
		1296	; fs_FloppyRead - LFN variant for reading floppy
		1297	;
		1298	; esi points to filename
		1299	; ebx pointer to 64-bit number = first wanted byte, 0+
		1300	; may be ebx=0 - start from first byte
		1301	; ecx number of bytes to read, 0+
		1302	; edx mem location to return data
		1303	;
77	diamond	1304	; ret ebx = bytes read or 0xffffffff file not found
71	diamond	1305	; eax = 0 ok read or other = errormsg
		1306	;
		1307	;--------------------------------------------------------------
		1308	fs_FloppyRead:
75	diamond	1309	call read_flp_fat
		1310	cmp byte [esi], 0
		1311	jnz @f
		1312	or ebx, -1
		1313	mov eax, 10 ; access denied
		1314	ret
71	diamond	1315	@@:
75	diamond	1316	push edi
		1317	call fd_find_lfn
		1318	jnc .found
		1319	pop edi
		1320	or ebx, -1
		1321	mov eax, 5 ; file not found
		1322	ret
71	diamond	1323	.found:
75	diamond	1324	test ebx, ebx
		1325	jz .l1
		1326	cmp dword [ebx+4], 0
		1327	jz @f
77	diamond	1328	xor ebx, ebx
71	diamond	1329	.reteof:
75	diamond	1330	mov eax, 6 ; EOF
		1331	pop edi
		1332	ret
71	diamond	1333	@@:
75	diamond	1334	mov ebx, [ebx]
71	diamond	1335	.l1:
77	diamond	1336	push ecx edx
		1337	push 0
		1338	mov eax, [edi+28]
		1339	sub eax, ebx
		1340	jb .eof
		1341	cmp eax, ecx
		1342	jae @f
		1343	mov ecx, eax
		1344	mov byte [esp], 6 ; EOF
		1345	@@:
75	diamond	1346	movzx edi, word [edi+26]
71	diamond	1347	.new:
75	diamond	1348	jecxz .done
		1349	test edi, edi
		1350	jz .eof
		1351	cmp edi, 0xFF8
		1352	jae .eof
113	diamond	1353	sub ebx, 512
		1354	jae .skip
77	diamond	1355	lea eax, [edi+31]
75	diamond	1356	pusha
		1357	call read_chs_sector
		1358	popa
		1359	cmp [FDC_Status], 0
		1360	jnz .err
380	serge	1361	lea eax, [FDD_BUFF+ebx+512]
75	diamond	1362	neg ebx
		1363	push ecx
		1364	cmp ecx, ebx
		1365	jbe @f
		1366	mov ecx, ebx
71	diamond	1367	@@:
75	diamond	1368	mov ebx, edx
		1369	call memmove
		1370	add edx, ecx
		1371	sub [esp], ecx
		1372	pop ecx
		1373	xor ebx, ebx
71	diamond	1374	.skip:
381	serge	1375	movzx edi, word [edi*2+FLOPPY_FAT]
75	diamond	1376	jmp .new
71	diamond	1377	.done:
77	diamond	1378	mov ebx, edx
		1379	pop eax edx ecx edi
		1380	sub ebx, edx
75	diamond	1381	ret
71	diamond	1382	.eof:
77	diamond	1383	mov ebx, edx
		1384	pop eax edx ecx
75	diamond	1385	jmp .reteof
71	diamond	1386	.err:
77	diamond	1387	mov ebx, edx
		1388	pop eax edx ecx edi
		1389	sub ebx, edx
83	diamond	1390	mov al, 11
75	diamond	1391	ret
		1392
		1393	;----------------------------------------------------------------
		1394	;
		1395	; fs_FloppyReadFolder - LFN variant for reading floppy folders
		1396	;
		1397	; esi points to filename
78	diamond	1398	; ebx pointer to structure: 32-bit number = first wanted block, 0+
		1399	; & flags (bitfields)
		1400	; flags: bit 0: 0=ANSI names, 1=UNICODE names
75	diamond	1401	; ecx number of blocks to read, 0+
		1402	; edx mem location to return data
		1403	;
77	diamond	1404	; ret ebx = blocks read or 0xffffffff folder not found
75	diamond	1405	; eax = 0 ok read or other = errormsg
		1406	;
		1407	;--------------------------------------------------------------
		1408	fs_FloppyReadFolder:
		1409	call read_flp_fat
		1410	push edi
		1411	cmp byte [esi], 0
		1412	jz .root
		1413	call fd_find_lfn
		1414	jnc .found
		1415	pop edi
		1416	or ebx, -1
		1417	mov eax, ERROR_FILE_NOT_FOUND
		1418	ret
		1419	.found:
		1420	test byte [edi+11], 0x10 ; do not allow read files
		1421	jnz .found_dir
		1422	pop edi
		1423	or ebx, -1
		1424	mov eax, ERROR_ACCESS_DENIED
		1425	ret
		1426	.found_dir:
		1427	movzx eax, word [edi+26]
		1428	add eax, 31
		1429	push 0
		1430	jmp .doit
		1431	.root:
		1432	mov eax, 19
		1433	push 14
		1434	.doit:
		1435	push ecx ebp
		1436	sub esp, 262*2 ; reserve space for LFN
		1437	mov ebp, esp
78	diamond	1438	push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE names
		1439	mov ebx, [ebx]
75	diamond	1440	; init header
		1441	push eax ecx
		1442	mov edi, edx
		1443	mov ecx, 32/4
		1444	xor eax, eax
		1445	rep stosd
		1446	pop ecx eax
		1447	mov byte [edx], 1 ; version
		1448	mov esi, edi ; esi points to BDFE
		1449	.main_loop:
		1450	pusha
		1451	call read_chs_sector
		1452	popa
		1453	cmp [FDC_Status], 0
		1454	jnz .error
380	serge	1455	mov edi, FDD_BUFF
75	diamond	1456	push eax
		1457	.l1:
		1458	call fat_get_name
		1459	jc .l2
		1460	cmp byte [edi+11], 0xF
		1461	jnz .do_bdfe
		1462	add edi, 0x20
		1463	cmp edi, 0xD200
		1464	jb .do_bdfe
		1465	pop eax
		1466	inc eax
		1467	dec byte [esp+262*2+12]
		1468	jz .done
		1469	jns @f
		1470	; read next sector from FAT
381	serge	1471	mov eax, [(eax-31-1)*2+FLOPPY_FAT]
75	diamond	1472	and eax, 0xFFF
		1473	cmp eax, 0xFF8
		1474	jae .done
		1475	add eax, 31
		1476	mov byte [esp+262*2+12], 0
		1477	@@:
		1478	pusha
		1479	call read_chs_sector
		1480	popa
		1481	cmp [FDC_Status], 0
		1482	jnz .error
380	serge	1483	mov edi, FDD_BUFF
75	diamond	1484	push eax
		1485	.do_bdfe:
		1486	inc dword [edx+8] ; new file found
		1487	dec ebx
		1488	jns .l2
		1489	dec ecx
		1490	js .l2
		1491	inc dword [edx+4] ; new file block copied
		1492	call fat_entry_to_bdfe
		1493	.l2:
		1494	add edi, 0x20
		1495	cmp edi, 0xD200
		1496	jb .l1
		1497	pop eax
		1498	inc eax
		1499	dec byte [esp+262*2+12]
		1500	jz .done
		1501	jns @f
		1502	; read next sector from FAT
381	serge	1503	mov eax, [(eax-31-1)*2+FLOPPY_FAT]
75	diamond	1504	and eax, 0xFFF
		1505	cmp eax, 0xFF8
		1506	jae .done
		1507	add eax, 31
		1508	mov byte [esp+262*2+12], 0
		1509	@@:
		1510	jmp .main_loop
		1511	.error:
		1512	add esp, 262*2+4
		1513	pop ebp ecx edi edi
		1514	or ebx, -1
		1515	mov eax, ERROR_FILE_NOT_FOUND
		1516	ret
		1517	.done:
		1518	add esp, 262*2+4
		1519	pop ebp
77	diamond	1520	mov ebx, [edx+4]
75	diamond	1521	xor eax, eax
		1522	dec ecx
		1523	js @f
		1524	mov al, ERROR_END_OF_FILE
		1525	@@:
		1526	pop ecx edi edi
		1527	ret
		1528
83	diamond	1529	;----------------------------------------------------------------
		1530	;
		1531	; fs_FloppyRewrite - LFN variant for writing sys floppy
		1532	;
		1533	; esi points to filename
		1534	; ebx ignored (reserved)
		1535	; ecx number of bytes to write, 0+
		1536	; edx mem location to data
		1537	;
		1538	; ret ebx = number of written bytes
		1539	; eax = 0 ok read or other = errormsg
		1540	;
		1541	;--------------------------------------------------------------
		1542	@@:
		1543	mov eax, ERROR_ACCESS_DENIED
		1544	xor ebx, ebx
		1545	ret
		1546	fsfrfe2:
		1547	popad
		1548	fsfrfe:
		1549	mov eax, 11
		1550	xor ebx, ebx
		1551	ret
		1552
321	diamond	1553	fs_FloppyCreateFolder:
		1554	mov al, 1
		1555	jmp fs_FloppyRewrite.common
		1556
83	diamond	1557	fs_FloppyRewrite:
321	diamond	1558	xor eax, eax
		1559	.common:
83	diamond	1560	cmp byte [esi], 0
		1561	jz @b
		1562	call read_flp_fat
		1563	cmp [FDC_Status], 0
		1564	jnz fsfrfe
		1565	pushad
		1566	xor ebp, ebp
		1567	push esi
		1568	@@:
		1569	lodsb
		1570	test al, al
		1571	jz @f
		1572	cmp al, '/'
		1573	jnz @b
		1574	lea ebp, [esi-1]
		1575	jmp @b
		1576	@@:
		1577	pop esi
		1578	test ebp, ebp
		1579	jnz .noroot
		1580	call read_flp_root
		1581	cmp [FDC_Status], 0
		1582	jnz fsfrfe2
		1583	push flp_rootmem_extend_dir
		1584	push flp_rootmem_end_write
		1585	push flp_rootmem_next_write
		1586	push flp_rootmem_begin_write
		1587	xor ebp, ebp
		1588	push ebp
		1589	push flp_rootmem_first
		1590	push flp_rootmem_next
		1591	jmp .common1
		1592	.noroot:
335	diamond	1593	mov eax, ERROR_ACCESS_DENIED
		1594	cmp byte [ebp+1], 0
		1595	jz .ret1
83	diamond	1596	; check existence
		1597	mov byte [ebp], 0
		1598	call fd_find_lfn
		1599	mov byte [ebp], '/'
		1600	lea esi, [ebp+1]
		1601	jnc @f
		1602	mov eax, ERROR_FILE_NOT_FOUND
		1603	.ret1:
		1604	mov [esp+28], eax
		1605	popad
		1606	xor ebx, ebx
		1607	ret
		1608	@@:
		1609	test byte [edi+11], 0x10 ; must be directory
		1610	mov eax, ERROR_ACCESS_DENIED
		1611	jz .ret1
		1612	movzx ebp, word [edi+26] ; ebp=cluster
		1613	mov eax, ERROR_FAT_TABLE
		1614	cmp ebp, 2
		1615	jb .ret1
		1616	cmp ebp, 2849
		1617	jae .ret1
		1618	push flp_notroot_extend_dir
		1619	push flp_notroot_end_write
		1620	push flp_notroot_next_write
		1621	push flp_notroot_begin_write
		1622	push ebp
		1623	push flp_notroot_first
		1624	push flp_notroot_next
		1625	.common1:
		1626	call fat_find_lfn
		1627	jc .notfound
321	diamond	1628	; found
91	diamond	1629	test byte [edi+11], 10h
321	diamond	1630	jz .exists_file
		1631	; found directory; if we are creating directory, return OK,
		1632	; if we are creating file, say "access denied"
		1633	add esp, 28
		1634	popad
		1635	test al, al
		1636	mov eax, ERROR_ACCESS_DENIED
91	diamond	1637	jz @f
321	diamond	1638	mov al, 0
		1639	@@:
		1640	xor ebx, ebx
		1641	ret
		1642	.exists_file:
		1643	; found file; if we are creating directory, return "access denied",
		1644	; if we are creating file, delete existing file and continue
		1645	cmp byte [esp+28+28], 0
		1646	jz @f
91	diamond	1647	add esp, 28
		1648	popad
		1649	mov eax, ERROR_ACCESS_DENIED
		1650	xor ebx, ebx
		1651	ret
		1652	@@:
		1653	; delete FAT chain
83	diamond	1654	push edi
		1655	xor eax, eax
		1656	mov dword [edi+28], eax ; zero size
		1657	xchg ax, word [edi+26] ; start cluster
		1658	test eax, eax
		1659	jz .done1
		1660	@@:
		1661	cmp eax, 0xFF8
		1662	jae .done1
321	diamond	1663	lea edi, [FLOPPY_FAT + eax*2] ; position in FAT
83	diamond	1664	xor eax, eax
		1665	xchg ax, [edi]
		1666	jmp @b
		1667	.done1:
		1668	pop edi
		1669	call get_time_for_file
		1670	mov [edi+22], ax
		1671	call get_date_for_file
		1672	mov [edi+24], ax
		1673	mov [edi+18], ax
		1674	or byte [edi+11], 20h ; set 'archive' attribute
		1675	jmp .doit
		1676	.notfound:
		1677	; file is not found; generate short name
		1678	call fat_name_is_legal
		1679	jc @f
		1680	add esp, 28
		1681	popad
		1682	mov eax, ERROR_FILE_NOT_FOUND
		1683	xor ebx, ebx
		1684	ret
		1685	@@:
		1686	sub esp, 12
		1687	mov edi, esp
		1688	call fat_gen_short_name
		1689	.test_short_name_loop:
		1690	push esi edi ecx
		1691	mov esi, edi
		1692	lea eax, [esp+12+12+8]
		1693	mov [eax], ebp
		1694	call dword [eax-4]
		1695	jc .found
		1696	.test_short_name_entry:
		1697	cmp byte [edi+11], 0xF
		1698	jz .test_short_name_cont
		1699	mov ecx, 11
		1700	push esi edi
		1701	repz cmpsb
		1702	pop edi esi
		1703	jz .short_name_found
		1704	.test_short_name_cont:
		1705	lea eax, [esp+12+12+8]
		1706	call dword [eax-8]
		1707	jnc .test_short_name_entry
		1708	jmp .found
		1709	.short_name_found:
		1710	pop ecx edi esi
		1711	call fat_next_short_name
		1712	jnc .test_short_name_loop
		1713	.disk_full:
		1714	add esp, 12+28
		1715	popa
		1716	mov eax, ERROR_DISK_FULL
		1717	xor ebx, ebx
		1718	ret
		1719	.found:
		1720	pop ecx edi esi
		1721	; now find space in directory
		1722	; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~'
		1723	mov al, '~'
		1724	push ecx edi
		1725	mov ecx, 8
		1726	repnz scasb
		1727	push 1
		1728	pop eax ; 1 entry
		1729	jnz .notilde
		1730	; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total
		1731	xor eax, eax
		1732	@@:
		1733	cmp byte [esi], 0
		1734	jz @f
		1735	inc esi
		1736	inc eax
		1737	jmp @b
		1738	@@:
		1739	sub esi, eax
		1740	add eax, 12+13
		1741	mov ecx, 13
		1742	push edx
		1743	cdq
		1744	div ecx
		1745	pop edx
		1746	.notilde:
		1747	push -1
		1748	push -1
		1749	; find successive entries in directory
		1750	xor ecx, ecx
		1751	push eax
		1752	lea eax, [esp+12+8+12+8]
		1753	mov [eax], ebp
		1754	call dword [eax-4]
		1755	pop eax
		1756	jnc .scan_dir
		1757	.fsfrfe3:
		1758	add esp, 8+8+12+28
		1759	popad
		1760	mov eax, 11
		1761	xor ebx, ebx
		1762	ret
		1763	.scan_dir:
		1764	cmp byte [edi], 0
		1765	jz .free
		1766	cmp byte [edi], 0xE5
		1767	jz .free
		1768	xor ecx, ecx
		1769	.scan_cont:
		1770	push eax
		1771	lea eax, [esp+12+8+12+8]
		1772	call dword [eax-8]
		1773	pop eax
		1774	jnc .scan_dir
		1775	cmp [FDC_Status], 0
		1776	jnz .fsfrfe3
		1777	push eax
		1778	lea eax, [esp+12+8+12+8]
		1779	call dword [eax+16] ; extend directory
		1780	pop eax
		1781	jnc .scan_dir
		1782	add esp, 8+8+12+28
		1783	popad
		1784	mov eax, ERROR_DISK_FULL
		1785	xor ebx, ebx
		1786	ret
		1787	.free:
		1788	test ecx, ecx
		1789	jnz @f
		1790	mov [esp], edi
		1791	mov ecx, [esp+8+8+12+8]
		1792	mov [esp+4], ecx
		1793	xor ecx, ecx
		1794	@@:
		1795	inc ecx
		1796	cmp ecx, eax
		1797	jb .scan_cont
		1798	; found!
		1799	; calculate name checksum
		1800	push esi ecx
		1801	mov esi, [esp+8+8]
		1802	mov ecx, 11
		1803	xor eax, eax
		1804	@@:
		1805	ror al, 1
		1806	add al, [esi]
		1807	inc esi
		1808	loop @b
		1809	pop ecx esi
		1810	pop edi
		1811	pop dword [esp+8+12+8]
		1812	; edi points to first entry in free chunk
		1813	dec ecx
		1814	jz .nolfn
		1815	push esi
		1816	push eax
		1817	lea eax, [esp+8+8+12+8]
		1818	call dword [eax+4] ; begin write
		1819	mov al, 40h
		1820	.writelfn:
		1821	or al, cl
		1822	mov esi, [esp+4]
		1823	push ecx
		1824	dec ecx
		1825	imul ecx, 13
		1826	add esi, ecx
		1827	stosb
		1828	mov cl, 5
		1829	call fs_RamdiskRewrite.read_symbols
		1830	mov ax, 0xF
		1831	stosw
		1832	mov al, [esp+4]
		1833	stosb
		1834	mov cl, 6
		1835	call fs_RamdiskRewrite.read_symbols
		1836	xor eax, eax
		1837	stosw
		1838	mov cl, 2
		1839	call fs_RamdiskRewrite.read_symbols
		1840	pop ecx
		1841	lea eax, [esp+8+8+12+8]
		1842	call dword [eax+8] ; next write
		1843	xor eax, eax
		1844	loop .writelfn
		1845	pop eax
		1846	pop esi
		1847	; lea eax, [esp+8+12+8]
		1848	; call dword [eax+12] ; end write
		1849	.nolfn:
		1850	xchg esi, [esp]
		1851	mov ecx, 11
		1852	rep movsb
		1853	mov word [edi], 20h ; attributes
		1854	sub edi, 11
		1855	pop esi ecx
		1856	add esp, 12
		1857	mov byte [edi+13], 0 ; tenths of a second at file creation time
		1858	call get_time_for_file
		1859	mov [edi+14], ax ; creation time
		1860	mov [edi+22], ax ; last write time
		1861	call get_date_for_file
		1862	mov [edi+16], ax ; creation date
		1863	mov [edi+24], ax ; last write date
		1864	mov [edi+18], ax ; last access date
		1865	and word [edi+20], 0 ; high word of cluster
		1866	and word [edi+26], 0 ; low word of cluster - to be filled
		1867	and dword [edi+28], 0 ; file size - to be filled
321	diamond	1868	cmp byte [esp+28+28], 0
		1869	jz .doit
		1870	; create directory
		1871	mov byte [edi+11], 10h ; attributes: folder
		1872	mov ecx, 32*2
		1873	mov edx, edi
83	diamond	1874	.doit:
		1875	lea eax, [esp+8]
		1876	call dword [eax+12] ; flush directory
		1877	push ecx
		1878	push edi
133	diamond	1879	push 0
83	diamond	1880	mov esi, edx
321	diamond	1881	test ecx, ecx
		1882	jz .done
83	diamond	1883	mov ecx, 2849
321	diamond	1884	mov edi, FLOPPY_FAT
83	diamond	1885	push 0 ; first cluster
		1886	.write_loop:
		1887	; allocate new cluster
		1888	xor eax, eax
		1889	repnz scasw
		1890	mov al, ERROR_DISK_FULL
		1891	jnz .ret
		1892	dec edi
		1893	dec edi
321	diamond	1894	lea eax, [edi-(FLOPPY_FAT)]
83	diamond	1895	shr eax, 1 ; eax = cluster
		1896	mov word [edi], 0xFFF ; mark as last cluster
133	diamond	1897	xchg edi, [esp+4]
83	diamond	1898	cmp dword [esp], 0
		1899	jz .first
		1900	stosw
		1901	jmp @f
		1902	.first:
		1903	mov [esp], eax
		1904	@@:
133	diamond	1905	mov edi, [esp+4]
83	diamond	1906	inc ecx
		1907	; write data
		1908	push ecx edi
		1909	mov ecx, 512
		1910	cmp dword [esp+20], ecx
		1911	jae @f
		1912	mov ecx, [esp+20]
		1913	@@:
380	serge	1914	mov edi, FDD_BUFF
321	diamond	1915	cmp byte [esp+24+28+28], 0
		1916	jnz .writedir
83	diamond	1917	push ecx
		1918	rep movsb
		1919	pop ecx
321	diamond	1920	.writedircont:
83	diamond	1921	push ecx
		1922	sub ecx, 512
		1923	neg ecx
		1924	push eax
		1925	xor eax, eax
		1926	rep stosb
		1927	pop eax
		1928	add eax, 31
		1929	pusha
		1930	call save_chs_sector
		1931	popa
		1932	pop ecx
		1933	cmp [FDC_Status], 0
		1934	jnz .diskerr
		1935	sub [esp+20], ecx
		1936	pop edi ecx
		1937	jnz .write_loop
		1938	.done:
		1939	xor eax, eax
		1940	.ret:
		1941	pop ebx edi edi ecx
		1942	mov [esp+28+28], eax
		1943	lea eax, [esp+8]
		1944	call dword [eax+4]
		1945	mov [edi+26], bx
		1946	mov ebx, esi
		1947	sub ebx, edx
		1948	mov [edi+28], ebx
		1949	call dword [eax+12]
		1950	mov [esp+28+16], ebx
		1951	test ebp, ebp
		1952	jnz @f
		1953	call save_flp_root
		1954	@@:
		1955	add esp, 28
		1956	cmp [FDC_Status], 0
		1957	jnz .err3
		1958	call save_flp_fat
		1959	cmp [FDC_Status], 0
		1960	jnz .err3
		1961	popa
		1962	ret
		1963	.err3:
		1964	popa
		1965	mov al, 11
		1966	xor ebx, ebx
		1967	ret
		1968	.diskerr:
		1969	sub esi, ecx
		1970	mov eax, 11
		1971	pop edi ecx
		1972	jmp .ret
321	diamond	1973	.writedir:
		1974	push ecx
		1975	mov ecx, 32/4
		1976	push ecx esi
		1977	rep movsd
		1978	pop esi ecx
		1979	mov dword [edi-32], '. '
		1980	mov dword [edi-32+4], ' '
		1981	mov dword [edi-32+8], ' '
		1982	mov byte [edi-32+11], 10h
		1983	mov word [edi-32+26], ax
		1984	push esi
		1985	rep movsd
		1986	pop esi
		1987	mov dword [edi-32], '.. '
		1988	mov dword [edi-32+4], ' '
		1989	mov dword [edi-32+8], ' '
		1990	mov byte [edi-32+11], 10h
		1991	mov ecx, [esp+28+8]
		1992	mov word [edi-32+26], cx
		1993	pop ecx
		1994	jmp .writedircont
83	diamond	1995
131	diamond	1996	;----------------------------------------------------------------
		1997	;
		1998	; fs_FloppyWrite - LFN variant for writing to floppy
		1999	;
		2000	; esi points to filename
		2001	; ebx pointer to 64-bit number = first wanted byte, 0+
		2002	; may be ebx=0 - start from first byte
		2003	; ecx number of bytes to write, 0+
		2004	; edx mem location to data
		2005	;
		2006	; ret ebx = bytes written (maybe 0)
		2007	; eax = 0 ok write or other = errormsg
		2008	;
		2009	;--------------------------------------------------------------
		2010
		2011	@@:
		2012	push ERROR_ACCESS_DENIED
		2013	fs_FloppyWrite.ret0:
		2014	pop eax
		2015	xor ebx, ebx
		2016	ret
		2017
		2018	fs_FloppyWrite.ret11:
		2019	push 11
		2020	jmp fs_FloppyWrite.ret0
		2021
		2022	fs_FloppyWrite:
		2023	cmp byte [esi], 0
		2024	jz @b
		2025	call read_flp_fat
		2026	cmp [FDC_Status], 0
		2027	jnz .ret11
		2028	pushad
		2029	call fd_find_lfn
		2030	jnc .found
		2031	popad
		2032	push ERROR_FILE_NOT_FOUND
		2033	jmp .ret0
		2034	.found:
		2035	; FAT does not support files larger than 4GB
		2036	test ebx, ebx
		2037	jz .l1
		2038	cmp dword [ebx+4], 0
		2039	jz @f
		2040	.eof:
		2041	popad
		2042	push ERROR_END_OF_FILE
		2043	jmp .ret0
		2044	@@:
		2045	mov ebx, [ebx]
		2046	.l1:
		2047	; now edi points to direntry, ebx=start byte to write,
		2048	; ecx=number of bytes to write, edx=data pointer
		2049
		2050	; extend file if needed
		2051	add ecx, ebx
		2052	jc .eof ; FAT does not support files larger than 4GB
		2053	push eax ; save directory cluster
		2054	push 0 ; return value=0
		2055
		2056	call get_time_for_file
		2057	mov [edi+22], ax ; last write time
		2058	call get_date_for_file
		2059	mov [edi+24], ax ; last write date
		2060	mov [edi+18], ax ; last access date
		2061
		2062	push dword [edi+28] ; save current file size
		2063	cmp ecx, [edi+28]
		2064	jbe .length_ok
		2065	cmp ecx, ebx
		2066	jz .length_ok
		2067	call floppy_extend_file
		2068	jnc .length_ok
		2069	mov [esp+4], eax
		2070	; floppy_extend_file can return two error codes: FAT table error or disk full.
		2071	; First case is fatal error, in second case we may write some data
		2072	cmp al, ERROR_DISK_FULL
		2073	jz .disk_full
		2074	pop eax
		2075	pop eax
		2076	mov [esp+4+28], eax
		2077	pop eax
		2078	popad
		2079	xor ebx, ebx
		2080	ret
		2081	.disk_full:
		2082	; correct number of bytes to write
		2083	mov ecx, [edi+28]
		2084	cmp ecx, ebx
		2085	ja .length_ok
		2086	.ret:
		2087	pop eax
		2088	pop eax
		2089	mov [esp+4+28], eax ; eax=return value
		2090	pop eax
		2091	sub edx, [esp+20]
		2092	mov [esp+16], edx ; ebx=number of written bytes
		2093	popad
		2094	ret
		2095	.length_ok:
		2096	; save FAT & directory
		2097	; note that directory must be saved first because save_flp_fat uses buffer at 0xD000
		2098	mov esi, [edi+28]
		2099	movzx edi, word [edi+26] ; starting cluster
		2100	mov eax, [esp+8]
		2101	pusha
		2102	call save_chs_sector
		2103	popa
		2104	cmp [FDC_Status], 0
		2105	jnz .device_err
		2106	call save_flp_fat
		2107	cmp [FDC_Status], 0
		2108	jz @f
		2109	.device_err:
		2110	mov byte [esp+4], 11
		2111	jmp .ret
		2112	@@:
		2113
		2114	; now ebx=start pos, ecx=end pos, both lie inside file
		2115	sub ecx, ebx
		2116	jz .ret
		2117	call SetUserInterrupts
		2118	.write_loop:
321	diamond	2119	; skip unmodified sectors
		2120	cmp dword [esp], 0x200
		2121	jb .modify
		2122	sub ebx, 0x200
		2123	jae .skip
		2124	add ebx, 0x200
		2125	.modify:
131	diamond	2126	lea eax, [edi+31] ; current sector
		2127	; get length of data in current sector
		2128	push ecx
		2129	sub ebx, 0x200
		2130	jb .hasdata
		2131	neg ebx
		2132	xor ecx, ecx
		2133	jmp @f
		2134	.hasdata:
		2135	neg ebx
		2136	cmp ecx, ebx
		2137	jbe @f
		2138	mov ecx, ebx
		2139	@@:
		2140	; load sector if needed
		2141	cmp dword [esp+4], 0 ; we don't need to read uninitialized data
		2142	jz .noread
		2143	cmp ecx, 0x200 ; we don't need to read sector if it is fully rewritten
		2144	jz .noread
		2145	cmp ecx, esi ; (same for the last sector)
		2146	jz .noread
		2147	pusha
		2148	call read_chs_sector
		2149	popa
		2150	cmp [FDC_Status], 0
		2151	jz @f
		2152	.device_err2:
		2153	pop ecx
		2154	jmp .device_err
		2155	@@:
		2156	.noread:
		2157	; zero uninitialized data if file was extended (because floppy_extend_file does not this)
		2158	push eax ecx edi
		2159	xor eax, eax
		2160	mov ecx, 0x200
		2161	sub ecx, [esp+4+12]
		2162	jbe @f
380	serge	2163	mov edi, FDD_BUFF
131	diamond	2164	add edi, [esp+4+12]
		2165	rep stosb
		2166	@@:
		2167	; zero uninitialized data in the last sector
		2168	mov ecx, 0x200
		2169	sub ecx, esi
		2170	jbe @f
380	serge	2171	mov edi, FDD_BUFF
131	diamond	2172	add edi, esi
		2173	rep stosb
		2174	@@:
		2175	pop edi ecx eax
		2176	; copy new data
		2177	push eax
		2178	mov eax, edx
		2179	neg ebx
		2180	jecxz @f
380	serge	2181	add ebx, FDD_BUFF+0x200
131	diamond	2182	call memmove
		2183	xor ebx, ebx
		2184	@@:
		2185	pop eax
		2186	; save sector
		2187	pusha
		2188	call save_chs_sector
		2189	popa
		2190	cmp [FDC_Status], 0
		2191	jnz .device_err2
		2192	add edx, ecx
		2193	sub [esp], ecx
		2194	pop ecx
		2195	jz .done
321	diamond	2196	.skip:
131	diamond	2197	.next_cluster:
381	serge	2198	movzx edi, word [edi*2+FLOPPY_FAT]
131	diamond	2199	sub esi, 0x200
		2200	jae @f
		2201	xor esi, esi
		2202	@@:
		2203	sub dword [esp], 0x200
		2204	jae .write_loop
		2205	and dword [esp], 0
		2206	jmp .write_loop
		2207	.done:
		2208	mov [fdc_irq_func], fdc_null
		2209	jmp .ret
		2210
		2211	floppy_extend_file.zero_size:
		2212	xor eax, eax
		2213	jmp floppy_extend_file.start_extend
		2214
		2215	; extends file on floppy to given size (new data area is undefined)
		2216	; in: edi->direntry, ecx=new size
133	diamond	2217	; out: CF=0 => OK, eax=0
131	diamond	2218	; CF=1 => error, eax=code (ERROR_FAT_TABLE or ERROR_DISK_FULL)
		2219	floppy_extend_file:
		2220	push ecx
		2221	; find the last cluster of file
		2222	movzx eax, word [edi+26] ; first cluster
		2223	mov ecx, [edi+28]
		2224	jecxz .zero_size
		2225	@@:
		2226	sub ecx, 0x200
		2227	jbe @f
381	serge	2228	mov eax, [eax*2+FLOPPY_FAT]
131	diamond	2229	and eax, 0xFFF
		2230	jz .fat_err
		2231	cmp eax, 0xFF8
		2232	jb @b
		2233	.fat_err:
		2234	pop ecx
		2235	push ERROR_FAT_TABLE
		2236	pop eax
		2237	stc
		2238	ret
		2239	@@:
		2240	push eax
381	serge	2241	mov eax, [eax*2+FLOPPY_FAT]
131	diamond	2242	and eax, 0xFFF
		2243	cmp eax, 0xFF8
		2244	pop eax
		2245	jb .fat_err
		2246	; set length to full number of sectors
		2247	sub [edi+28], ecx
		2248	.start_extend:
		2249	pop ecx
		2250	; now do extend
		2251	push edx esi
381	serge	2252	mov esi, FLOPPY_FAT+2*2 ; start scan from cluster 2
131	diamond	2253	mov edx, 2847 ; number of clusters to scan
		2254	.extend_loop:
		2255	cmp [edi+28], ecx
		2256	jae .extend_done
		2257	; add new sector
		2258	push ecx
		2259	push edi
		2260	.scan:
		2261	mov ecx, edx
		2262	mov edi, esi
		2263	jecxz .disk_full
		2264	push eax
		2265	xor eax, eax
		2266	repnz scasw
		2267	pop eax
		2268	jnz .disk_full
		2269	mov word [edi-2], 0xFFF
		2270	mov esi, edi
		2271	mov edx, ecx
381	serge	2272	sub edi, FLOPPY_FAT
131	diamond	2273	shr edi, 1
		2274	dec edi ; now edi=new cluster
		2275	test eax, eax
		2276	jz .first_cluster
381	serge	2277	mov [FLOPPY_FAT+eax*2], di
131	diamond	2278	jmp @f
		2279	.first_cluster:
		2280	pop eax ; eax->direntry
		2281	push eax
		2282	mov [eax+26], di
		2283	@@:
		2284	mov eax, edi ; eax=new cluster
		2285	pop edi ; edi->direntry
		2286	pop ecx ; ecx=required size
		2287	add dword [edi+28], 0x200
		2288	jmp .extend_loop
		2289	.extend_done:
		2290	mov [edi+28], ecx
		2291	pop esi edx
133	diamond	2292	xor eax, eax ; CF=0
131	diamond	2293	ret
		2294	.disk_full:
		2295	pop edi ecx
		2296	pop esi edx
		2297	stc
		2298	push ERROR_DISK_FULL
		2299	pop eax
		2300	ret
		2301
133	diamond	2302	;----------------------------------------------------------------
		2303	;
		2304	; fs_FloppySetFileEnd - set end of file on floppy
		2305	;
		2306	; esi points to filename
		2307	; ebx points to 64-bit number = new file size
		2308	; ecx ignored (reserved)
		2309	; edx ignored (reserved)
		2310	;
		2311	; ret eax = 0 ok or other = errormsg
		2312	;
		2313	;--------------------------------------------------------------
		2314	fs_FloppySetFileEnd:
		2315	call read_flp_fat
		2316	cmp [FDC_Status], 0
		2317	jnz ret11
		2318	cmp byte [esi], 0
		2319	jnz @f
		2320	.access_denied:
		2321	push ERROR_ACCESS_DENIED
		2322	jmp .ret
		2323	@@:
		2324	push edi
		2325	call fd_find_lfn
		2326	jnc @f
		2327	pop edi
		2328	push ERROR_FILE_NOT_FOUND
		2329	.ret:
		2330	pop eax
		2331	jmp .doret
		2332	@@:
		2333	; must not be directory
		2334	test byte [edi+11], 10h
		2335	jz @f
		2336	pop edi
		2337	jmp .access_denied
		2338	@@:
		2339	; file size must not exceed 4 Gb
		2340	cmp dword [ebx+4], 0
		2341	jz @f
		2342	pop edi
		2343	push ERROR_END_OF_FILE
		2344	jmp .ret
		2345	@@:
		2346	push eax
		2347	; set file modification date/time to current
		2348	call fat_update_datetime
		2349	mov eax, [ebx]
		2350	cmp eax, [edi+28]
		2351	jb .truncate
		2352	ja .expand
		2353	pop eax
		2354	pushad
		2355	call save_chs_sector
		2356	popad
		2357	pop edi
		2358	xor eax, eax
		2359	cmp [FDC_Status], 0
		2360	jz @f
		2361	mov al, 11
		2362	@@:
		2363	.doret:
		2364	mov [fdc_irq_func], fdc_null
		2365	ret
		2366	.expand:
		2367	push ecx
		2368	push dword [edi+28] ; save old size
		2369	mov ecx, eax
		2370	call floppy_extend_file
		2371	push eax ; return code
		2372	jnc .expand_ok
		2373	cmp al, ERROR_DISK_FULL
		2374	jz .disk_full
		2375	pop eax ecx ecx edi edi
		2376	jmp .doret
		2377	.device_err:
		2378	pop eax
		2379	.device_err2:
		2380	pop ecx ecx eax edi
		2381	push 11
		2382	jmp .ret
		2383	.disk_full:
		2384	.expand_ok:
		2385	; save directory & FAT
		2386	mov eax, [edi+28]
		2387	xchg eax, [esp+12]
		2388	movzx edi, word [edi+26]
		2389	pusha
		2390	call save_chs_sector
		2391	popa
		2392	cmp [FDC_Status], 0
		2393	jnz .device_err
		2394	call save_flp_fat
		2395	cmp [FDC_Status], 0
		2396	jnz .device_err
		2397	call SetUserInterrupts
		2398	; now zero new data
		2399	; edi = current cluster, [esp+12]=new size, [esp+4]=old size, [esp]=return code
		2400	.zero_loop:
		2401	sub dword [esp+4], 0x200
		2402	jae .next_cluster
		2403	cmp dword [esp+4], -0x200
		2404	jz .noread
		2405	lea eax, [edi+31]
		2406	pusha
		2407	call read_chs_sector
		2408	popa
		2409	cmp [FDC_Status], 0
		2410	jnz .err_next
		2411	.noread:
		2412	mov ecx, [esp+4]
		2413	neg ecx
		2414	push edi
380	serge	2415	mov edi, FDD_BUFF+0x200
133	diamond	2416	add edi, [esp+8]
		2417	xor eax, eax
		2418	mov [esp+8], eax
		2419	rep stosb
		2420	pop edi
		2421	lea eax, [edi+31]
		2422	pusha
		2423	call save_chs_sector
		2424	popa
		2425	cmp [FDC_Status], 0
		2426	jz .next_cluster
		2427	.err_next:
		2428	mov byte [esp], 11
		2429	.next_cluster:
		2430	sub dword [esp+12], 0x200
		2431	jbe .expand_done
381	serge	2432	movzx edi, word [FLOPPY_FAT+edi*2]
133	diamond	2433	jmp .zero_loop
		2434	.expand_done:
		2435	pop eax ecx ecx edi edi
		2436	jmp .doret
		2437	.truncate:
		2438	mov [edi+28], eax
		2439	push ecx
		2440	movzx ecx, word [edi+26]
		2441	test eax, eax
		2442	jz .zero_size
		2443	; find new last sector
		2444	@@:
		2445	sub eax, 0x200
		2446	jbe @f
381	serge	2447	movzx ecx, word [FLOPPY_FAT+ecx*2]
133	diamond	2448	jmp @b
		2449	@@:
		2450	; we will zero data at the end of last sector - remember it
		2451	push ecx
		2452	; terminate FAT chain
381	serge	2453	lea ecx, [FLOPPY_FAT+ecx+ecx]
133	diamond	2454	push dword [ecx]
		2455	mov word [ecx], 0xFFF
		2456	pop ecx
		2457	and ecx, 0xFFF
		2458	jmp .delete
		2459	.zero_size:
		2460	and word [edi+26], 0
		2461	push 0
		2462	.delete:
		2463	; delete FAT chain starting with ecx
		2464	; mark all clusters as free
		2465	cmp ecx, 0xFF8
		2466	jae .deleted
381	serge	2467	lea ecx, [FLOPPY_FAT+ecx+ecx]
133	diamond	2468	push dword [ecx]
		2469	and word [ecx], 0
		2470	pop ecx
		2471	and ecx, 0xFFF
		2472	jmp .delete
		2473	.deleted:
		2474	mov edi, [edi+28]
		2475	; save directory & FAT
		2476	mov eax, [esp+8]
		2477	pusha
		2478	call save_chs_sector
		2479	popa
		2480	cmp [FDC_Status], 0
		2481	jnz .device_err2
		2482	call save_flp_fat
		2483	cmp [FDC_Status], 0
		2484	jnz .device_err2
		2485	; zero last sector, ignore errors
		2486	pop eax
		2487	add eax, 31
		2488	and edi, 0x1FF
		2489	jz .truncate_done
		2490	call SetUserInterrupts
		2491	pusha
		2492	call read_chs_sector
		2493	popa
380	serge	2494	add edi, FDD_BUFF
		2495	mov ecx, FDD_BUFF+0x200
133	diamond	2496	sub ecx, edi
		2497	push eax
		2498	xor eax, eax
		2499	rep stosb
		2500	pop eax
		2501	pusha
		2502	call save_chs_sector
		2503	popa
		2504	.truncate_done:
		2505	pop ecx eax edi
		2506	xor eax, eax
		2507	jmp .doret
		2508
86	diamond	2509	fs_FloppyGetFileInfo:
		2510	call read_flp_fat
		2511	cmp [FDC_Status], 0
		2512	jnz ret11
		2513	cmp byte [esi], 0
		2514	jnz @f
		2515	mov eax, 2 ; unsupported
		2516	ret
		2517	@@:
		2518	push edi
		2519	call fd_find_lfn
		2520	jmp fs_GetFileInfo_finish
		2521
		2522	ret11:
		2523	mov eax, 11
		2524	ret
		2525
		2526	fs_FloppySetFileInfo:
		2527	call read_flp_fat
		2528	cmp [FDC_Status], 0
		2529	jnz ret11
		2530	cmp byte [esi], 0
		2531	jnz @f
		2532	mov eax, 2 ; unsupported
		2533	ret
		2534	@@:
		2535	push edi
		2536	call fd_find_lfn
		2537	jnc @f
		2538	pop edi
		2539	mov eax, ERROR_FILE_NOT_FOUND
		2540	ret
		2541	@@:
		2542	push eax
		2543	call bdfe_to_fat_entry
		2544	pop eax
		2545	pusha
		2546	call save_chs_sector
		2547	popa
		2548	pop edi
		2549	xor eax, eax
		2550	cmp [FDC_Status], 0
		2551	jz @f
		2552	mov al, 11
		2553	@@:
		2554	ret
		2555
321	diamond	2556	if 0
91	diamond	2557	;----------------------------------------------------------------
		2558	;
		2559	; fs_FloppyExecute - LFN variant for executing from floppy
		2560	;
		2561	; esi points to floppy filename (e.g. 'dir1/name')
		2562	; ebp points to full filename (e.g. '/fd/1/dir1/name')
		2563	; dword [ebx] = flags
		2564	; dword [ebx+4] = cmdline
		2565	;
		2566	; ret ebx,edx destroyed
		2567	; eax > 0 - PID, < 0 - error
		2568	;
		2569	;--------------------------------------------------------------
		2570	fs_FloppyExecute:
		2571	mov edx, [ebx]
		2572	mov ebx, [ebx+4]
		2573	test ebx, ebx
		2574	jz @f
		2575	add ebx, std_application_base_address
		2576	@@:
		2577
		2578	;----------------------------------------------------------------
		2579	;
		2580	; fs_FloppyExecute.flags - second entry
		2581	;
		2582	; esi points to floppy filename (kernel address)
		2583	; ebp points to full filename
		2584	; edx flags
		2585	; ebx cmdline (kernel address)
		2586	;
		2587	; ret eax > 0 - PID, < 0 - error
		2588	;
		2589	;--------------------------------------------------------------
		2590
		2591	.flags:
		2592	call read_flp_fat
		2593	cmp byte [esi], 0
		2594	jnz @f
		2595	; cannot execute root!
		2596	mov eax, -ERROR_ACCESS_DENIED
		2597	ret
		2598	@@:
		2599	push edi
		2600	call fd_find_lfn
		2601	jnc .found
		2602	pop edi
		2603	mov eax, -ERROR_FILE_NOT_FOUND
		2604	ret
		2605	.found:
		2606	movzx eax, word [edi+26] ; cluster
		2607	push eax
		2608	push dword [edi+28] ; size
		2609	push .DoRead
		2610	call fs_execute
		2611	add esp, 12
		2612	pop edi
		2613	ret
		2614
		2615	.DoRead:
		2616	; read next block
		2617	; in: eax->parameters, edi->buffer
		2618	; out: eax = error code
		2619	pushad
		2620	cmp dword [eax], 0 ; file size
		2621	jz .eof
		2622	mov eax, [eax+4] ; cluster
		2623	add eax, 31
		2624	call read_chs_sector
		2625	cmp [FDC_Status], 0
		2626	jnz .err
		2627	pop edi
380	serge	2628	mov esi, FDD_BUFF
91	diamond	2629	push edi
		2630	mov ecx, 512/4
		2631	rep movsd
		2632	mov eax, [esp+28]
		2633	mov ecx, [eax]
		2634	sub ecx, 512
		2635	jae @f
		2636	add edi, ecx
		2637	neg ecx
		2638	push eax
		2639	xor eax, eax
		2640	rep stosb
		2641	pop eax
		2642	@@:
		2643	mov [eax], ecx
		2644	mov edx, [eax+4]
381	serge	2645	mov dx, [edx*2+FLOPPY_FAT]
91	diamond	2646	mov [eax+4], dx ; high word is already zero
		2647	popad
		2648	xor eax, eax
		2649	ret
		2650	.eof:
		2651	popad
		2652	mov eax, 6
		2653	ret
		2654	.err:
		2655	popad
		2656	mov eax, 11
		2657	ret
321	diamond	2658	end if
91	diamond	2659
171	diamond	2660	;----------------------------------------------------------------
		2661	;
		2662	; fs_FloppyDelete - delete file or empty folder from floppy
		2663	;
		2664	; esi points to filename
		2665	;
		2666	; ret eax = 0 ok or other = errormsg
		2667	;
		2668	;--------------------------------------------------------------
		2669	fs_FloppyDelete:
		2670	call read_flp_fat
		2671	cmp [FDC_Status], 0
		2672	jz @f
		2673	push 11
		2674	jmp .pop_ret
		2675	@@:
		2676	cmp byte [esi], 0
		2677	jnz @f
		2678	; cannot delete root!
		2679	.access_denied:
		2680	push ERROR_ACCESS_DENIED
		2681	.pop_ret:
		2682	pop eax
		2683	ret
		2684	@@:
		2685	and [fd_prev_sector], 0
		2686	and [fd_prev_prev_sector], 0
		2687	push edi
		2688	call fd_find_lfn
		2689	jnc .found
		2690	pop edi
		2691	push ERROR_FILE_NOT_FOUND
		2692	jmp .pop_ret
		2693	.found:
		2694	cmp dword [edi], '. '
		2695	jz .access_denied2
		2696	cmp dword [edi], '.. '
		2697	jz .access_denied2
		2698	test byte [edi+11], 10h
		2699	jz .dodel
		2700	; we can delete only empty folders!
		2701	push eax
		2702	movzx eax, word [edi+26]
		2703	push ebx
		2704	pusha
		2705	add eax, 31
		2706	call read_chs_sector
		2707	popa
380	serge	2708	mov ebx, FDD_BUFF + 2*0x20
171	diamond	2709	.checkempty:
		2710	cmp byte [ebx], 0
		2711	jz .empty
		2712	cmp byte [ebx], 0xE5
		2713	jnz .notempty
		2714	add ebx, 0x20
380	serge	2715	cmp ebx, FDD_BUFF + 0x200
171	diamond	2716	jb .checkempty
		2717	movzx eax, word [FLOPPY_FAT + eax*2]
		2718	pusha
		2719	add eax, 31
		2720	call read_chs_sector
		2721	popa
380	serge	2722	mov ebx, FDD_BUFF
171	diamond	2723	jmp .checkempty
		2724	.notempty:
		2725	pop ebx
		2726	pop eax
		2727	.access_denied2:
		2728	pop edi
		2729	jmp .access_denied
		2730	.empty:
		2731	pop ebx
		2732	pop eax
		2733	pusha
		2734	call read_chs_sector
		2735	popa
		2736	.dodel:
		2737	push eax
		2738	movzx eax, word [edi+26]
		2739	xchg eax, [esp]
		2740	; delete folder entry
		2741	mov byte [edi], 0xE5
		2742	; delete LFN (if present)
		2743	.lfndel:
380	serge	2744	cmp edi, FDD_BUFF
171	diamond	2745	ja @f
		2746	cmp [fd_prev_sector], 0
		2747	jz .lfndone
		2748	push [fd_prev_sector]
		2749	push [fd_prev_prev_sector]
		2750	pop [fd_prev_sector]
		2751	and [fd_prev_prev_sector], 0
		2752	pusha
		2753	call save_chs_sector
		2754	popa
		2755	pop eax
		2756	pusha
		2757	call read_chs_sector
		2758	popa
380	serge	2759	mov edi, FDD_BUFF+0x200
171	diamond	2760	@@:
		2761	sub edi, 0x20
		2762	cmp byte [edi], 0xE5
		2763	jz .lfndone
		2764	cmp byte [edi+11], 0xF
		2765	jnz .lfndone
		2766	mov byte [edi], 0xE5
		2767	jmp .lfndel
		2768	.lfndone:
		2769	pusha
		2770	call save_chs_sector
		2771	popa
		2772	; delete FAT chain
		2773	pop eax
		2774	test eax, eax
		2775	jz .done
		2776	@@:
		2777	lea eax, [FLOPPY_FAT + eax*2]
		2778	push dword [eax]
		2779	and word [eax], 0
		2780	pop eax
		2781	and eax, 0xFFF
		2782	jnz @b
		2783	.done:
		2784	call save_flp_fat
		2785	pop edi
		2786	xor eax, eax
		2787	ret
		2788
78	diamond	2789	; \end{diamond}

Subversion Repositories Kolibri OS

(root)/kernel/trunk/fs/fat12.inc @ 431 – Rev 381