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
		34	mov eax,[0x3000]
		35	shl eax,5
115	poddubny	36	mov eax,[eax+0x3000+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
		107	mov esi,0x8000
		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
		150	mov edi,0xD000
		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
		222	add edi,0x282000
		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 ; ��
1	ha	277	mov edi,0x8000
		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 ; ��
1	ha	306	mov edi,0x8000
		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
		335	mov esi,0x8000
		336	mov edi,0x282000
		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
		364	cmp edi,0x282000+2856*2 ;2849 clusters
		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
		387	mov edi,0xD000+39
		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:
		395	mov esi,0xD000+39
		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 ; ��
1	ha	416	mov esi,0x8000
		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 ; ��
1	ha	445	mov esi,0x8000
		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
		474	mov esi,0x282000
		475	mov edi,0x8000
		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
		492	cmp edi,0x8000+0x1200 ;4274 bytes - all used FAT
		493	jb fcnew2_1
		494
		495	mov esi,0x8000 ; duplicate fat chain
		496	mov edi,0x8000+0x1200
		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
		537	mov edi,0xD000
		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
		577	add edi,0x282000
		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
		665	mov edi,0x8000 ;Point at directory
		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
		692	mov edi,0xD000
		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
		786	add edi,0x282000
		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
		923	mov ebx,0xD000
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
		940	add eax,0x282000
		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
		988	mov ebx,0xD000
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
		1002	add eax,0x282000
		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
		1016	add eax,0x282000
		1017	sub edi,0x282000
		1018	mov [eax],di
		1019
		1020	pusha
		1021	mov ecx,512/4
		1022	xor eax,eax
		1023	mov edi,0xD000
		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
		1035	mov ebx,0xD000
		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
		1064	add edi,0x282000
		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
75	diamond	1148	mov edi, 0xD000
83	diamond	1149	ret ; CF=0
		1150	.readerr:
		1151	stc
		1152	ret
		1153
		1154	flp_rootmem_first:
		1155	mov edi, 0x8000
		1156	clc
		1157	ret
		1158	flp_rootmem_next:
		1159	add edi, 0x20
		1160	cmp edi, 0x8000+14*0x200
		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
		1182	mov ecx, [(ecx-31)*2+0x282000]
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
		1198	mov edi, 0xD000
		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
		1232	mov edi, 0x282000
		1233	mov ecx, 2849
		1234	repnz scasw
		1235	jnz .notfound
		1236	mov word [edi-2], 0xFFF ; mark as last cluster
		1237	sub edi, 0x282000
		1238	shr edi, 1
		1239	dec edi
		1240	mov eax, [esp+28]
		1241	mov ecx, [eax]
		1242	mov [0x282000+ecx*2], di
		1243	mov [eax], edi
		1244	xor eax, eax
		1245	mov edi, 0xD000
		1246	mov ecx, 128
		1247	rep stosd
		1248	popa
		1249	call flp_notroot_end_write
		1250	mov edi, 0xD000
		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
77	diamond	1361	lea eax, [0xD000+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:
75	diamond	1375	movzx edi, word [edi*2+0x282000]
		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
		1455	mov edi, 0xD000
		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
		1471	mov eax, [(eax-31-1)*2+0x282000]
		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
		1483	mov edi, 0xD000
		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
		1503	mov eax, [(eax-31-1)*2+0x282000]
		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:
		1593	; check existence
		1594	mov byte [ebp], 0
		1595	call fd_find_lfn
		1596	mov byte [ebp], '/'
		1597	lea esi, [ebp+1]
		1598	jnc @f
		1599	mov eax, ERROR_FILE_NOT_FOUND
		1600	.ret1:
		1601	mov [esp+28], eax
		1602	popad
		1603	xor ebx, ebx
		1604	ret
		1605	@@:
		1606	test byte [edi+11], 0x10 ; must be directory
		1607	mov eax, ERROR_ACCESS_DENIED
		1608	jz .ret1
		1609	movzx ebp, word [edi+26] ; ebp=cluster
		1610	mov eax, ERROR_FAT_TABLE
		1611	cmp ebp, 2
		1612	jb .ret1
		1613	cmp ebp, 2849
		1614	jae .ret1
		1615	push flp_notroot_extend_dir
		1616	push flp_notroot_end_write
		1617	push flp_notroot_next_write
		1618	push flp_notroot_begin_write
		1619	push ebp
		1620	push flp_notroot_first
		1621	push flp_notroot_next
		1622	.common1:
		1623	call fat_find_lfn
		1624	jc .notfound
321	diamond	1625	; found
91	diamond	1626	test byte [edi+11], 10h
321	diamond	1627	jz .exists_file
		1628	; found directory; if we are creating directory, return OK,
		1629	; if we are creating file, say "access denied"
		1630	add esp, 28
		1631	popad
		1632	test al, al
		1633	mov eax, ERROR_ACCESS_DENIED
91	diamond	1634	jz @f
321	diamond	1635	mov al, 0
		1636	@@:
		1637	xor ebx, ebx
		1638	ret
		1639	.exists_file:
		1640	; found file; if we are creating directory, return "access denied",
		1641	; if we are creating file, delete existing file and continue
		1642	cmp byte [esp+28+28], 0
		1643	jz @f
91	diamond	1644	add esp, 28
		1645	popad
		1646	mov eax, ERROR_ACCESS_DENIED
		1647	xor ebx, ebx
		1648	ret
		1649	@@:
		1650	; delete FAT chain
83	diamond	1651	push edi
		1652	xor eax, eax
		1653	mov dword [edi+28], eax ; zero size
		1654	xchg ax, word [edi+26] ; start cluster
		1655	test eax, eax
		1656	jz .done1
		1657	@@:
		1658	cmp eax, 0xFF8
		1659	jae .done1
321	diamond	1660	lea edi, [FLOPPY_FAT + eax*2] ; position in FAT
83	diamond	1661	xor eax, eax
		1662	xchg ax, [edi]
		1663	jmp @b
		1664	.done1:
		1665	pop edi
		1666	call get_time_for_file
		1667	mov [edi+22], ax
		1668	call get_date_for_file
		1669	mov [edi+24], ax
		1670	mov [edi+18], ax
		1671	or byte [edi+11], 20h ; set 'archive' attribute
		1672	jmp .doit
		1673	.notfound:
		1674	; file is not found; generate short name
		1675	call fat_name_is_legal
		1676	jc @f
		1677	add esp, 28
		1678	popad
		1679	mov eax, ERROR_FILE_NOT_FOUND
		1680	xor ebx, ebx
		1681	ret
		1682	@@:
		1683	sub esp, 12
		1684	mov edi, esp
		1685	call fat_gen_short_name
		1686	.test_short_name_loop:
		1687	push esi edi ecx
		1688	mov esi, edi
		1689	lea eax, [esp+12+12+8]
		1690	mov [eax], ebp
		1691	call dword [eax-4]
		1692	jc .found
		1693	.test_short_name_entry:
		1694	cmp byte [edi+11], 0xF
		1695	jz .test_short_name_cont
		1696	mov ecx, 11
		1697	push esi edi
		1698	repz cmpsb
		1699	pop edi esi
		1700	jz .short_name_found
		1701	.test_short_name_cont:
		1702	lea eax, [esp+12+12+8]
		1703	call dword [eax-8]
		1704	jnc .test_short_name_entry
		1705	jmp .found
		1706	.short_name_found:
		1707	pop ecx edi esi
		1708	call fat_next_short_name
		1709	jnc .test_short_name_loop
		1710	.disk_full:
		1711	add esp, 12+28
		1712	popa
		1713	mov eax, ERROR_DISK_FULL
		1714	xor ebx, ebx
		1715	ret
		1716	.found:
		1717	pop ecx edi esi
		1718	; now find space in directory
		1719	; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~'
		1720	mov al, '~'
		1721	push ecx edi
		1722	mov ecx, 8
		1723	repnz scasb
		1724	push 1
		1725	pop eax ; 1 entry
		1726	jnz .notilde
		1727	; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total
		1728	xor eax, eax
		1729	@@:
		1730	cmp byte [esi], 0
		1731	jz @f
		1732	inc esi
		1733	inc eax
		1734	jmp @b
		1735	@@:
		1736	sub esi, eax
		1737	add eax, 12+13
		1738	mov ecx, 13
		1739	push edx
		1740	cdq
		1741	div ecx
		1742	pop edx
		1743	.notilde:
		1744	push -1
		1745	push -1
		1746	; find successive entries in directory
		1747	xor ecx, ecx
		1748	push eax
		1749	lea eax, [esp+12+8+12+8]
		1750	mov [eax], ebp
		1751	call dword [eax-4]
		1752	pop eax
		1753	jnc .scan_dir
		1754	.fsfrfe3:
		1755	add esp, 8+8+12+28
		1756	popad
		1757	mov eax, 11
		1758	xor ebx, ebx
		1759	ret
		1760	.scan_dir:
		1761	cmp byte [edi], 0
		1762	jz .free
		1763	cmp byte [edi], 0xE5
		1764	jz .free
		1765	xor ecx, ecx
		1766	.scan_cont:
		1767	push eax
		1768	lea eax, [esp+12+8+12+8]
		1769	call dword [eax-8]
		1770	pop eax
		1771	jnc .scan_dir
		1772	cmp [FDC_Status], 0
		1773	jnz .fsfrfe3
		1774	push eax
		1775	lea eax, [esp+12+8+12+8]
		1776	call dword [eax+16] ; extend directory
		1777	pop eax
		1778	jnc .scan_dir
		1779	add esp, 8+8+12+28
		1780	popad
		1781	mov eax, ERROR_DISK_FULL
		1782	xor ebx, ebx
		1783	ret
		1784	.free:
		1785	test ecx, ecx
		1786	jnz @f
		1787	mov [esp], edi
		1788	mov ecx, [esp+8+8+12+8]
		1789	mov [esp+4], ecx
		1790	xor ecx, ecx
		1791	@@:
		1792	inc ecx
		1793	cmp ecx, eax
		1794	jb .scan_cont
		1795	; found!
		1796	; calculate name checksum
		1797	push esi ecx
		1798	mov esi, [esp+8+8]
		1799	mov ecx, 11
		1800	xor eax, eax
		1801	@@:
		1802	ror al, 1
		1803	add al, [esi]
		1804	inc esi
		1805	loop @b
		1806	pop ecx esi
		1807	pop edi
		1808	pop dword [esp+8+12+8]
		1809	; edi points to first entry in free chunk
		1810	dec ecx
		1811	jz .nolfn
		1812	push esi
		1813	push eax
		1814	lea eax, [esp+8+8+12+8]
		1815	call dword [eax+4] ; begin write
		1816	mov al, 40h
		1817	.writelfn:
		1818	or al, cl
		1819	mov esi, [esp+4]
		1820	push ecx
		1821	dec ecx
		1822	imul ecx, 13
		1823	add esi, ecx
		1824	stosb
		1825	mov cl, 5
		1826	call fs_RamdiskRewrite.read_symbols
		1827	mov ax, 0xF
		1828	stosw
		1829	mov al, [esp+4]
		1830	stosb
		1831	mov cl, 6
		1832	call fs_RamdiskRewrite.read_symbols
		1833	xor eax, eax
		1834	stosw
		1835	mov cl, 2
		1836	call fs_RamdiskRewrite.read_symbols
		1837	pop ecx
		1838	lea eax, [esp+8+8+12+8]
		1839	call dword [eax+8] ; next write
		1840	xor eax, eax
		1841	loop .writelfn
		1842	pop eax
		1843	pop esi
		1844	; lea eax, [esp+8+12+8]
		1845	; call dword [eax+12] ; end write
		1846	.nolfn:
		1847	xchg esi, [esp]
		1848	mov ecx, 11
		1849	rep movsb
		1850	mov word [edi], 20h ; attributes
		1851	sub edi, 11
		1852	pop esi ecx
		1853	add esp, 12
		1854	mov byte [edi+13], 0 ; tenths of a second at file creation time
		1855	call get_time_for_file
		1856	mov [edi+14], ax ; creation time
		1857	mov [edi+22], ax ; last write time
		1858	call get_date_for_file
		1859	mov [edi+16], ax ; creation date
		1860	mov [edi+24], ax ; last write date
		1861	mov [edi+18], ax ; last access date
		1862	and word [edi+20], 0 ; high word of cluster
		1863	and word [edi+26], 0 ; low word of cluster - to be filled
		1864	and dword [edi+28], 0 ; file size - to be filled
321	diamond	1865	cmp byte [esp+28+28], 0
		1866	jz .doit
		1867	; create directory
		1868	mov byte [edi+11], 10h ; attributes: folder
		1869	mov ecx, 32*2
		1870	mov edx, edi
83	diamond	1871	.doit:
		1872	lea eax, [esp+8]
		1873	call dword [eax+12] ; flush directory
		1874	push ecx
		1875	push edi
133	diamond	1876	push 0
83	diamond	1877	mov esi, edx
321	diamond	1878	test ecx, ecx
		1879	jz .done
83	diamond	1880	mov ecx, 2849
321	diamond	1881	mov edi, FLOPPY_FAT
83	diamond	1882	push 0 ; first cluster
		1883	.write_loop:
		1884	; allocate new cluster
		1885	xor eax, eax
		1886	repnz scasw
		1887	mov al, ERROR_DISK_FULL
		1888	jnz .ret
		1889	dec edi
		1890	dec edi
321	diamond	1891	lea eax, [edi-(FLOPPY_FAT)]
83	diamond	1892	shr eax, 1 ; eax = cluster
		1893	mov word [edi], 0xFFF ; mark as last cluster
133	diamond	1894	xchg edi, [esp+4]
83	diamond	1895	cmp dword [esp], 0
		1896	jz .first
		1897	stosw
		1898	jmp @f
		1899	.first:
		1900	mov [esp], eax
		1901	@@:
133	diamond	1902	mov edi, [esp+4]
83	diamond	1903	inc ecx
		1904	; write data
		1905	push ecx edi
		1906	mov ecx, 512
		1907	cmp dword [esp+20], ecx
		1908	jae @f
		1909	mov ecx, [esp+20]
		1910	@@:
321	diamond	1911	mov edi, 0xD000
		1912	cmp byte [esp+24+28+28], 0
		1913	jnz .writedir
83	diamond	1914	push ecx
		1915	rep movsb
		1916	pop ecx
321	diamond	1917	.writedircont:
83	diamond	1918	push ecx
		1919	sub ecx, 512
		1920	neg ecx
		1921	push eax
		1922	xor eax, eax
		1923	rep stosb
		1924	pop eax
		1925	add eax, 31
		1926	pusha
		1927	call save_chs_sector
		1928	popa
		1929	pop ecx
		1930	cmp [FDC_Status], 0
		1931	jnz .diskerr
		1932	sub [esp+20], ecx
		1933	pop edi ecx
		1934	jnz .write_loop
		1935	.done:
		1936	xor eax, eax
		1937	.ret:
		1938	pop ebx edi edi ecx
		1939	mov [esp+28+28], eax
		1940	lea eax, [esp+8]
		1941	call dword [eax+4]
		1942	mov [edi+26], bx
		1943	mov ebx, esi
		1944	sub ebx, edx
		1945	mov [edi+28], ebx
		1946	call dword [eax+12]
		1947	mov [esp+28+16], ebx
		1948	test ebp, ebp
		1949	jnz @f
		1950	call save_flp_root
		1951	@@:
		1952	add esp, 28
		1953	cmp [FDC_Status], 0
		1954	jnz .err3
		1955	call save_flp_fat
		1956	cmp [FDC_Status], 0
		1957	jnz .err3
		1958	popa
		1959	ret
		1960	.err3:
		1961	popa
		1962	mov al, 11
		1963	xor ebx, ebx
		1964	ret
		1965	.diskerr:
		1966	sub esi, ecx
		1967	mov eax, 11
		1968	pop edi ecx
		1969	jmp .ret
321	diamond	1970	.writedir:
		1971	push ecx
		1972	mov ecx, 32/4
		1973	push ecx esi
		1974	rep movsd
		1975	pop esi ecx
		1976	mov dword [edi-32], '. '
		1977	mov dword [edi-32+4], ' '
		1978	mov dword [edi-32+8], ' '
		1979	mov byte [edi-32+11], 10h
		1980	mov word [edi-32+26], ax
		1981	push esi
		1982	rep movsd
		1983	pop esi
		1984	mov dword [edi-32], '.. '
		1985	mov dword [edi-32+4], ' '
		1986	mov dword [edi-32+8], ' '
		1987	mov byte [edi-32+11], 10h
		1988	mov ecx, [esp+28+8]
		1989	mov word [edi-32+26], cx
		1990	pop ecx
		1991	jmp .writedircont
83	diamond	1992
131	diamond	1993	;----------------------------------------------------------------
		1994	;
		1995	; fs_FloppyWrite - LFN variant for writing to floppy
		1996	;
		1997	; esi points to filename
		1998	; ebx pointer to 64-bit number = first wanted byte, 0+
		1999	; may be ebx=0 - start from first byte
		2000	; ecx number of bytes to write, 0+
		2001	; edx mem location to data
		2002	;
		2003	; ret ebx = bytes written (maybe 0)
		2004	; eax = 0 ok write or other = errormsg
		2005	;
		2006	;--------------------------------------------------------------
		2007
		2008	@@:
		2009	push ERROR_ACCESS_DENIED
		2010	fs_FloppyWrite.ret0:
		2011	pop eax
		2012	xor ebx, ebx
		2013	ret
		2014
		2015	fs_FloppyWrite.ret11:
		2016	push 11
		2017	jmp fs_FloppyWrite.ret0
		2018
		2019	fs_FloppyWrite:
		2020	cmp byte [esi], 0
		2021	jz @b
		2022	call read_flp_fat
		2023	cmp [FDC_Status], 0
		2024	jnz .ret11
		2025	pushad
		2026	call fd_find_lfn
		2027	jnc .found
		2028	popad
		2029	push ERROR_FILE_NOT_FOUND
		2030	jmp .ret0
		2031	.found:
		2032	; FAT does not support files larger than 4GB
		2033	test ebx, ebx
		2034	jz .l1
		2035	cmp dword [ebx+4], 0
		2036	jz @f
		2037	.eof:
		2038	popad
		2039	push ERROR_END_OF_FILE
		2040	jmp .ret0
		2041	@@:
		2042	mov ebx, [ebx]
		2043	.l1:
		2044	; now edi points to direntry, ebx=start byte to write,
		2045	; ecx=number of bytes to write, edx=data pointer
		2046
		2047	; extend file if needed
		2048	add ecx, ebx
		2049	jc .eof ; FAT does not support files larger than 4GB
		2050	push eax ; save directory cluster
		2051	push 0 ; return value=0
		2052
		2053	call get_time_for_file
		2054	mov [edi+22], ax ; last write time
		2055	call get_date_for_file
		2056	mov [edi+24], ax ; last write date
		2057	mov [edi+18], ax ; last access date
		2058
		2059	push dword [edi+28] ; save current file size
		2060	cmp ecx, [edi+28]
		2061	jbe .length_ok
		2062	cmp ecx, ebx
		2063	jz .length_ok
		2064	call floppy_extend_file
		2065	jnc .length_ok
		2066	mov [esp+4], eax
		2067	; floppy_extend_file can return two error codes: FAT table error or disk full.
		2068	; First case is fatal error, in second case we may write some data
		2069	cmp al, ERROR_DISK_FULL
		2070	jz .disk_full
		2071	pop eax
		2072	pop eax
		2073	mov [esp+4+28], eax
		2074	pop eax
		2075	popad
		2076	xor ebx, ebx
		2077	ret
		2078	.disk_full:
		2079	; correct number of bytes to write
		2080	mov ecx, [edi+28]
		2081	cmp ecx, ebx
		2082	ja .length_ok
		2083	.ret:
		2084	pop eax
		2085	pop eax
		2086	mov [esp+4+28], eax ; eax=return value
		2087	pop eax
		2088	sub edx, [esp+20]
		2089	mov [esp+16], edx ; ebx=number of written bytes
		2090	popad
		2091	ret
		2092	.length_ok:
		2093	; save FAT & directory
		2094	; note that directory must be saved first because save_flp_fat uses buffer at 0xD000
		2095	mov esi, [edi+28]
		2096	movzx edi, word [edi+26] ; starting cluster
		2097	mov eax, [esp+8]
		2098	pusha
		2099	call save_chs_sector
		2100	popa
		2101	cmp [FDC_Status], 0
		2102	jnz .device_err
		2103	call save_flp_fat
		2104	cmp [FDC_Status], 0
		2105	jz @f
		2106	.device_err:
		2107	mov byte [esp+4], 11
		2108	jmp .ret
		2109	@@:
		2110
		2111	; now ebx=start pos, ecx=end pos, both lie inside file
		2112	sub ecx, ebx
		2113	jz .ret
		2114	call SetUserInterrupts
		2115	.write_loop:
321	diamond	2116	; skip unmodified sectors
		2117	cmp dword [esp], 0x200
		2118	jb .modify
		2119	sub ebx, 0x200
		2120	jae .skip
		2121	add ebx, 0x200
		2122	.modify:
131	diamond	2123	lea eax, [edi+31] ; current sector
		2124	; get length of data in current sector
		2125	push ecx
		2126	sub ebx, 0x200
		2127	jb .hasdata
		2128	neg ebx
		2129	xor ecx, ecx
		2130	jmp @f
		2131	.hasdata:
		2132	neg ebx
		2133	cmp ecx, ebx
		2134	jbe @f
		2135	mov ecx, ebx
		2136	@@:
		2137	; load sector if needed
		2138	cmp dword [esp+4], 0 ; we don't need to read uninitialized data
		2139	jz .noread
		2140	cmp ecx, 0x200 ; we don't need to read sector if it is fully rewritten
		2141	jz .noread
		2142	cmp ecx, esi ; (same for the last sector)
		2143	jz .noread
		2144	pusha
		2145	call read_chs_sector
		2146	popa
		2147	cmp [FDC_Status], 0
		2148	jz @f
		2149	.device_err2:
		2150	pop ecx
		2151	jmp .device_err
		2152	@@:
		2153	.noread:
		2154	; zero uninitialized data if file was extended (because floppy_extend_file does not this)
		2155	push eax ecx edi
		2156	xor eax, eax
		2157	mov ecx, 0x200
		2158	sub ecx, [esp+4+12]
		2159	jbe @f
		2160	mov edi, 0xD000
		2161	add edi, [esp+4+12]
		2162	rep stosb
		2163	@@:
		2164	; zero uninitialized data in the last sector
		2165	mov ecx, 0x200
		2166	sub ecx, esi
		2167	jbe @f
		2168	mov edi, 0xD000
		2169	add edi, esi
		2170	rep stosb
		2171	@@:
		2172	pop edi ecx eax
		2173	; copy new data
		2174	push eax
		2175	mov eax, edx
		2176	neg ebx
		2177	jecxz @f
		2178	add ebx, 0xD000+0x200
		2179	call memmove
		2180	xor ebx, ebx
		2181	@@:
		2182	pop eax
		2183	; save sector
		2184	pusha
		2185	call save_chs_sector
		2186	popa
		2187	cmp [FDC_Status], 0
		2188	jnz .device_err2
		2189	add edx, ecx
		2190	sub [esp], ecx
		2191	pop ecx
		2192	jz .done
321	diamond	2193	.skip:
131	diamond	2194	.next_cluster:
		2195	movzx edi, word [edi*2+0x282000]
		2196	sub esi, 0x200
		2197	jae @f
		2198	xor esi, esi
		2199	@@:
		2200	sub dword [esp], 0x200
		2201	jae .write_loop
		2202	and dword [esp], 0
		2203	jmp .write_loop
		2204	.done:
		2205	mov [fdc_irq_func], fdc_null
		2206	jmp .ret
		2207
		2208	floppy_extend_file.zero_size:
		2209	xor eax, eax
		2210	jmp floppy_extend_file.start_extend
		2211
		2212	; extends file on floppy to given size (new data area is undefined)
		2213	; in: edi->direntry, ecx=new size
133	diamond	2214	; out: CF=0 => OK, eax=0
131	diamond	2215	; CF=1 => error, eax=code (ERROR_FAT_TABLE or ERROR_DISK_FULL)
		2216	floppy_extend_file:
		2217	push ecx
		2218	; find the last cluster of file
		2219	movzx eax, word [edi+26] ; first cluster
		2220	mov ecx, [edi+28]
		2221	jecxz .zero_size
		2222	@@:
		2223	sub ecx, 0x200
		2224	jbe @f
		2225	mov eax, [eax*2+0x282000]
		2226	and eax, 0xFFF
		2227	jz .fat_err
		2228	cmp eax, 0xFF8
		2229	jb @b
		2230	.fat_err:
		2231	pop ecx
		2232	push ERROR_FAT_TABLE
		2233	pop eax
		2234	stc
		2235	ret
		2236	@@:
		2237	push eax
		2238	mov eax, [eax*2+0x282000]
		2239	and eax, 0xFFF
		2240	cmp eax, 0xFF8
		2241	pop eax
		2242	jb .fat_err
		2243	; set length to full number of sectors
		2244	sub [edi+28], ecx
		2245	.start_extend:
		2246	pop ecx
		2247	; now do extend
		2248	push edx esi
		2249	mov esi, 0x282000+2*2 ; start scan from cluster 2
		2250	mov edx, 2847 ; number of clusters to scan
		2251	.extend_loop:
		2252	cmp [edi+28], ecx
		2253	jae .extend_done
		2254	; add new sector
		2255	push ecx
		2256	push edi
		2257	.scan:
		2258	mov ecx, edx
		2259	mov edi, esi
		2260	jecxz .disk_full
		2261	push eax
		2262	xor eax, eax
		2263	repnz scasw
		2264	pop eax
		2265	jnz .disk_full
		2266	mov word [edi-2], 0xFFF
		2267	mov esi, edi
		2268	mov edx, ecx
		2269	sub edi, 0x282000
		2270	shr edi, 1
		2271	dec edi ; now edi=new cluster
		2272	test eax, eax
		2273	jz .first_cluster
		2274	mov [0x282000+eax*2], di
		2275	jmp @f
		2276	.first_cluster:
		2277	pop eax ; eax->direntry
		2278	push eax
		2279	mov [eax+26], di
		2280	@@:
		2281	mov eax, edi ; eax=new cluster
		2282	pop edi ; edi->direntry
		2283	pop ecx ; ecx=required size
		2284	add dword [edi+28], 0x200
		2285	jmp .extend_loop
		2286	.extend_done:
		2287	mov [edi+28], ecx
		2288	pop esi edx
133	diamond	2289	xor eax, eax ; CF=0
131	diamond	2290	ret
		2291	.disk_full:
		2292	pop edi ecx
		2293	pop esi edx
		2294	stc
		2295	push ERROR_DISK_FULL
		2296	pop eax
		2297	ret
		2298
133	diamond	2299	;----------------------------------------------------------------
		2300	;
		2301	; fs_FloppySetFileEnd - set end of file on floppy
		2302	;
		2303	; esi points to filename
		2304	; ebx points to 64-bit number = new file size
		2305	; ecx ignored (reserved)
		2306	; edx ignored (reserved)
		2307	;
		2308	; ret eax = 0 ok or other = errormsg
		2309	;
		2310	;--------------------------------------------------------------
		2311	fs_FloppySetFileEnd:
		2312	call read_flp_fat
		2313	cmp [FDC_Status], 0
		2314	jnz ret11
		2315	cmp byte [esi], 0
		2316	jnz @f
		2317	.access_denied:
		2318	push ERROR_ACCESS_DENIED
		2319	jmp .ret
		2320	@@:
		2321	push edi
		2322	call fd_find_lfn
		2323	jnc @f
		2324	pop edi
		2325	push ERROR_FILE_NOT_FOUND
		2326	.ret:
		2327	pop eax
		2328	jmp .doret
		2329	@@:
		2330	; must not be directory
		2331	test byte [edi+11], 10h
		2332	jz @f
		2333	pop edi
		2334	jmp .access_denied
		2335	@@:
		2336	; file size must not exceed 4 Gb
		2337	cmp dword [ebx+4], 0
		2338	jz @f
		2339	pop edi
		2340	push ERROR_END_OF_FILE
		2341	jmp .ret
		2342	@@:
		2343	push eax
		2344	; set file modification date/time to current
		2345	call fat_update_datetime
		2346	mov eax, [ebx]
		2347	cmp eax, [edi+28]
		2348	jb .truncate
		2349	ja .expand
		2350	pop eax
		2351	pushad
		2352	call save_chs_sector
		2353	popad
		2354	pop edi
		2355	xor eax, eax
		2356	cmp [FDC_Status], 0
		2357	jz @f
		2358	mov al, 11
		2359	@@:
		2360	.doret:
		2361	mov [fdc_irq_func], fdc_null
		2362	ret
		2363	.expand:
		2364	push ecx
		2365	push dword [edi+28] ; save old size
		2366	mov ecx, eax
		2367	call floppy_extend_file
		2368	push eax ; return code
		2369	jnc .expand_ok
		2370	cmp al, ERROR_DISK_FULL
		2371	jz .disk_full
		2372	pop eax ecx ecx edi edi
		2373	jmp .doret
		2374	.device_err:
		2375	pop eax
		2376	.device_err2:
		2377	pop ecx ecx eax edi
		2378	push 11
		2379	jmp .ret
		2380	.disk_full:
		2381	.expand_ok:
		2382	; save directory & FAT
		2383	mov eax, [edi+28]
		2384	xchg eax, [esp+12]
		2385	movzx edi, word [edi+26]
		2386	pusha
		2387	call save_chs_sector
		2388	popa
		2389	cmp [FDC_Status], 0
		2390	jnz .device_err
		2391	call save_flp_fat
		2392	cmp [FDC_Status], 0
		2393	jnz .device_err
		2394	call SetUserInterrupts
		2395	; now zero new data
		2396	; edi = current cluster, [esp+12]=new size, [esp+4]=old size, [esp]=return code
		2397	.zero_loop:
		2398	sub dword [esp+4], 0x200
		2399	jae .next_cluster
		2400	cmp dword [esp+4], -0x200
		2401	jz .noread
		2402	lea eax, [edi+31]
		2403	pusha
		2404	call read_chs_sector
		2405	popa
		2406	cmp [FDC_Status], 0
		2407	jnz .err_next
		2408	.noread:
		2409	mov ecx, [esp+4]
		2410	neg ecx
		2411	push edi
		2412	mov edi, 0xD000+0x200
		2413	add edi, [esp+8]
		2414	xor eax, eax
		2415	mov [esp+8], eax
		2416	rep stosb
		2417	pop edi
		2418	lea eax, [edi+31]
		2419	pusha
		2420	call save_chs_sector
		2421	popa
		2422	cmp [FDC_Status], 0
		2423	jz .next_cluster
		2424	.err_next:
		2425	mov byte [esp], 11
		2426	.next_cluster:
		2427	sub dword [esp+12], 0x200
		2428	jbe .expand_done
		2429	movzx edi, word [0x282000+edi*2]
		2430	jmp .zero_loop
		2431	.expand_done:
		2432	pop eax ecx ecx edi edi
		2433	jmp .doret
		2434	.truncate:
		2435	mov [edi+28], eax
		2436	push ecx
		2437	movzx ecx, word [edi+26]
		2438	test eax, eax
		2439	jz .zero_size
		2440	; find new last sector
		2441	@@:
		2442	sub eax, 0x200
		2443	jbe @f
		2444	movzx ecx, word [0x282000+ecx*2]
		2445	jmp @b
		2446	@@:
		2447	; we will zero data at the end of last sector - remember it
		2448	push ecx
		2449	; terminate FAT chain
		2450	lea ecx, [0x282000+ecx+ecx]
		2451	push dword [ecx]
		2452	mov word [ecx], 0xFFF
		2453	pop ecx
		2454	and ecx, 0xFFF
		2455	jmp .delete
		2456	.zero_size:
		2457	and word [edi+26], 0
		2458	push 0
		2459	.delete:
		2460	; delete FAT chain starting with ecx
		2461	; mark all clusters as free
		2462	cmp ecx, 0xFF8
		2463	jae .deleted
		2464	lea ecx, [0x282000+ecx+ecx]
		2465	push dword [ecx]
		2466	and word [ecx], 0
		2467	pop ecx
		2468	and ecx, 0xFFF
		2469	jmp .delete
		2470	.deleted:
		2471	mov edi, [edi+28]
		2472	; save directory & FAT
		2473	mov eax, [esp+8]
		2474	pusha
		2475	call save_chs_sector
		2476	popa
		2477	cmp [FDC_Status], 0
		2478	jnz .device_err2
		2479	call save_flp_fat
		2480	cmp [FDC_Status], 0
		2481	jnz .device_err2
		2482	; zero last sector, ignore errors
		2483	pop eax
		2484	add eax, 31
		2485	and edi, 0x1FF
		2486	jz .truncate_done
		2487	call SetUserInterrupts
		2488	pusha
		2489	call read_chs_sector
		2490	popa
		2491	add edi, 0xD000
		2492	mov ecx, 0xD000+0x200
		2493	sub ecx, edi
		2494	push eax
		2495	xor eax, eax
		2496	rep stosb
		2497	pop eax
		2498	pusha
		2499	call save_chs_sector
		2500	popa
		2501	.truncate_done:
		2502	pop ecx eax edi
		2503	xor eax, eax
		2504	jmp .doret
		2505
86	diamond	2506	fs_FloppyGetFileInfo:
		2507	call read_flp_fat
		2508	cmp [FDC_Status], 0
		2509	jnz ret11
		2510	cmp byte [esi], 0
		2511	jnz @f
		2512	mov eax, 2 ; unsupported
		2513	ret
		2514	@@:
		2515	push edi
		2516	call fd_find_lfn
		2517	jmp fs_GetFileInfo_finish
		2518
		2519	ret11:
		2520	mov eax, 11
		2521	ret
		2522
		2523	fs_FloppySetFileInfo:
		2524	call read_flp_fat
		2525	cmp [FDC_Status], 0
		2526	jnz ret11
		2527	cmp byte [esi], 0
		2528	jnz @f
		2529	mov eax, 2 ; unsupported
		2530	ret
		2531	@@:
		2532	push edi
		2533	call fd_find_lfn
		2534	jnc @f
		2535	pop edi
		2536	mov eax, ERROR_FILE_NOT_FOUND
		2537	ret
		2538	@@:
		2539	push eax
		2540	call bdfe_to_fat_entry
		2541	pop eax
		2542	pusha
		2543	call save_chs_sector
		2544	popa
		2545	pop edi
		2546	xor eax, eax
		2547	cmp [FDC_Status], 0
		2548	jz @f
		2549	mov al, 11
		2550	@@:
		2551	ret
		2552
321	diamond	2553	if 0
91	diamond	2554	;----------------------------------------------------------------
		2555	;
		2556	; fs_FloppyExecute - LFN variant for executing from floppy
		2557	;
		2558	; esi points to floppy filename (e.g. 'dir1/name')
		2559	; ebp points to full filename (e.g. '/fd/1/dir1/name')
		2560	; dword [ebx] = flags
		2561	; dword [ebx+4] = cmdline
		2562	;
		2563	; ret ebx,edx destroyed
		2564	; eax > 0 - PID, < 0 - error
		2565	;
		2566	;--------------------------------------------------------------
		2567	fs_FloppyExecute:
		2568	mov edx, [ebx]
		2569	mov ebx, [ebx+4]
		2570	test ebx, ebx
		2571	jz @f
		2572	add ebx, std_application_base_address
		2573	@@:
		2574
		2575	;----------------------------------------------------------------
		2576	;
		2577	; fs_FloppyExecute.flags - second entry
		2578	;
		2579	; esi points to floppy filename (kernel address)
		2580	; ebp points to full filename
		2581	; edx flags
		2582	; ebx cmdline (kernel address)
		2583	;
		2584	; ret eax > 0 - PID, < 0 - error
		2585	;
		2586	;--------------------------------------------------------------
		2587
		2588	.flags:
		2589	call read_flp_fat
		2590	cmp byte [esi], 0
		2591	jnz @f
		2592	; cannot execute root!
		2593	mov eax, -ERROR_ACCESS_DENIED
		2594	ret
		2595	@@:
		2596	push edi
		2597	call fd_find_lfn
		2598	jnc .found
		2599	pop edi
		2600	mov eax, -ERROR_FILE_NOT_FOUND
		2601	ret
		2602	.found:
		2603	movzx eax, word [edi+26] ; cluster
		2604	push eax
		2605	push dword [edi+28] ; size
		2606	push .DoRead
		2607	call fs_execute
		2608	add esp, 12
		2609	pop edi
		2610	ret
		2611
		2612	.DoRead:
		2613	; read next block
		2614	; in: eax->parameters, edi->buffer
		2615	; out: eax = error code
		2616	pushad
		2617	cmp dword [eax], 0 ; file size
		2618	jz .eof
		2619	mov eax, [eax+4] ; cluster
		2620	add eax, 31
		2621	call read_chs_sector
		2622	cmp [FDC_Status], 0
		2623	jnz .err
		2624	pop edi
		2625	mov esi, 0xD000
		2626	push edi
		2627	mov ecx, 512/4
		2628	rep movsd
		2629	mov eax, [esp+28]
		2630	mov ecx, [eax]
		2631	sub ecx, 512
		2632	jae @f
		2633	add edi, ecx
		2634	neg ecx
		2635	push eax
		2636	xor eax, eax
		2637	rep stosb
		2638	pop eax
		2639	@@:
		2640	mov [eax], ecx
		2641	mov edx, [eax+4]
		2642	mov dx, [edx*2+0x282000]
		2643	mov [eax+4], dx ; high word is already zero
		2644	popad
		2645	xor eax, eax
		2646	ret
		2647	.eof:
		2648	popad
		2649	mov eax, 6
		2650	ret
		2651	.err:
		2652	popad
		2653	mov eax, 11
		2654	ret
321	diamond	2655	end if
91	diamond	2656
171	diamond	2657	;----------------------------------------------------------------
		2658	;
		2659	; fs_FloppyDelete - delete file or empty folder from floppy
		2660	;
		2661	; esi points to filename
		2662	;
		2663	; ret eax = 0 ok or other = errormsg
		2664	;
		2665	;--------------------------------------------------------------
		2666	fs_FloppyDelete:
		2667	call read_flp_fat
		2668	cmp [FDC_Status], 0
		2669	jz @f
		2670	push 11
		2671	jmp .pop_ret
		2672	@@:
		2673	cmp byte [esi], 0
		2674	jnz @f
		2675	; cannot delete root!
		2676	.access_denied:
		2677	push ERROR_ACCESS_DENIED
		2678	.pop_ret:
		2679	pop eax
		2680	ret
		2681	@@:
		2682	and [fd_prev_sector], 0
		2683	and [fd_prev_prev_sector], 0
		2684	push edi
		2685	call fd_find_lfn
		2686	jnc .found
		2687	pop edi
		2688	push ERROR_FILE_NOT_FOUND
		2689	jmp .pop_ret
		2690	.found:
		2691	cmp dword [edi], '. '
		2692	jz .access_denied2
		2693	cmp dword [edi], '.. '
		2694	jz .access_denied2
		2695	test byte [edi+11], 10h
		2696	jz .dodel
		2697	; we can delete only empty folders!
		2698	push eax
		2699	movzx eax, word [edi+26]
		2700	push ebx
		2701	pusha
		2702	add eax, 31
		2703	call read_chs_sector
		2704	popa
		2705	mov ebx, FDD_DATA + 2*0x20
		2706	.checkempty:
		2707	cmp byte [ebx], 0
		2708	jz .empty
		2709	cmp byte [ebx], 0xE5
		2710	jnz .notempty
		2711	add ebx, 0x20
		2712	cmp ebx, FDD_DATA + 0x200
		2713	jb .checkempty
		2714	movzx eax, word [FLOPPY_FAT + eax*2]
		2715	pusha
		2716	add eax, 31
		2717	call read_chs_sector
		2718	popa
		2719	mov ebx, FDD_DATA
		2720	jmp .checkempty
		2721	.notempty:
		2722	pop ebx
		2723	pop eax
		2724	.access_denied2:
		2725	pop edi
		2726	jmp .access_denied
		2727	.empty:
		2728	pop ebx
		2729	pop eax
		2730	pusha
		2731	call read_chs_sector
		2732	popa
		2733	.dodel:
		2734	push eax
		2735	movzx eax, word [edi+26]
		2736	xchg eax, [esp]
		2737	; delete folder entry
		2738	mov byte [edi], 0xE5
		2739	; delete LFN (if present)
		2740	.lfndel:
		2741	cmp edi, FDD_DATA
		2742	ja @f
		2743	cmp [fd_prev_sector], 0
		2744	jz .lfndone
		2745	push [fd_prev_sector]
		2746	push [fd_prev_prev_sector]
		2747	pop [fd_prev_sector]
		2748	and [fd_prev_prev_sector], 0
		2749	pusha
		2750	call save_chs_sector
		2751	popa
		2752	pop eax
		2753	pusha
		2754	call read_chs_sector
		2755	popa
		2756	mov edi, FDD_DATA+0x200
		2757	@@:
		2758	sub edi, 0x20
		2759	cmp byte [edi], 0xE5
		2760	jz .lfndone
		2761	cmp byte [edi+11], 0xF
		2762	jnz .lfndone
		2763	mov byte [edi], 0xE5
		2764	jmp .lfndel
		2765	.lfndone:
		2766	pusha
		2767	call save_chs_sector
		2768	popa
		2769	; delete FAT chain
		2770	pop eax
		2771	test eax, eax
		2772	jz .done
		2773	@@:
		2774	lea eax, [FLOPPY_FAT + eax*2]
		2775	push dword [eax]
		2776	and word [eax], 0
		2777	pop eax
		2778	and eax, 0xFFF
		2779	jnz @b
		2780	.done:
		2781	call save_flp_fat
		2782	pop edi
		2783	xor eax, eax
		2784	ret
		2785
78	diamond	2786	; \end{diamond}

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(root)/kernel/trunk/fs/fat12.inc – Rev 321