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
		1117	flp_root_next:
		1118	cmp edi, 0xD200-0x20
		1119	jae @f
75	diamond	1120	add edi, 0x20
83	diamond	1121	ret ; CF=0
		1122	@@:
		1123	; read next sector
		1124	inc dword [eax]
		1125	cmp dword [eax], 14
		1126	jae flp_root_first.readerr
		1127	flp_root_first:
		1128	mov eax, [eax]
		1129	pusha
		1130	add eax, 19
75	diamond	1131	call read_chs_sector
83	diamond	1132	popa
75	diamond	1133	cmp [FDC_Status], 0
83	diamond	1134	jnz .readerr
75	diamond	1135	mov edi, 0xD000
83	diamond	1136	ret ; CF=0
		1137	.readerr:
		1138	stc
		1139	ret
		1140
		1141	flp_rootmem_first:
		1142	mov edi, 0x8000
		1143	clc
		1144	ret
		1145	flp_rootmem_next:
		1146	add edi, 0x20
		1147	cmp edi, 0x8000+14*0x200
		1148	cmc
		1149	flp_rootmem_next_write:
		1150	flp_rootmem_begin_write:
		1151	flp_rootmem_end_write:
		1152	ret
		1153	flp_rootmem_extend_dir:
		1154	stc
		1155	ret
		1156
		1157	flp_notroot_next:
		1158	cmp edi, 0xD200-0x20
		1159	jae flp_notroot_next_sector
		1160	add edi, 0x20
		1161	ret ; CF=0
		1162	flp_notroot_next_sector:
		1163	push ecx
		1164	mov ecx, [eax]
		1165	mov ecx, [ecx*2+0x282000]
		1166	and ecx, 0xFFF
		1167	cmp ecx, 2849
		1168	jae flp_notroot_first.err2
		1169	mov [eax], ecx
		1170	pop ecx
		1171	flp_notroot_first:
		1172	mov eax, [eax]
		1173	cmp eax, 2
		1174	jb .err
		1175	cmp eax, 2849
		1176	jae .err
		1177	pusha
75	diamond	1178	add eax, 31
83	diamond	1179	call read_chs_sector
		1180	popa
		1181	mov edi, 0xD000
		1182	cmp [FDC_Status], 0
		1183	jnz .err
		1184	ret ; CF=0
		1185	.err2:
		1186	pop ecx
		1187	.err:
		1188	stc
75	diamond	1189	ret
83	diamond	1190	flp_notroot_begin_write:
		1191	pusha
		1192	mov eax, [eax]
		1193	add eax, 31
		1194	call read_chs_sector
		1195	popa
		1196	ret
		1197	flp_notroot_end_write:
		1198	pusha
		1199	mov eax, [eax]
		1200	add eax, 31
		1201	call save_chs_sector
		1202	popa
		1203	ret
		1204	flp_notroot_next_write:
		1205	cmp edi, 0xD200
		1206	jae @f
		1207	ret
		1208	@@:
		1209	call flp_notroot_end_write
		1210	jmp flp_notroot_next_sector
		1211	flp_notroot_extend_dir:
		1212	; find free cluster in FAT
		1213	pusha
		1214	xor eax, eax
		1215	mov edi, 0x282000
		1216	mov ecx, 2849
		1217	repnz scasw
		1218	jnz .notfound
		1219	mov word [edi-2], 0xFFF ; mark as last cluster
		1220	sub edi, 0x282000
		1221	shr edi, 1
		1222	dec edi
		1223	mov eax, [esp+28]
		1224	mov ecx, [eax]
		1225	mov [0x282000+ecx*2], di
		1226	mov [eax], edi
		1227	xor eax, eax
		1228	mov edi, 0xD000
		1229	mov ecx, 128
		1230	rep stosd
		1231	popa
		1232	call flp_notroot_end_write
		1233	mov edi, 0xD000
		1234	clc
		1235	ret
		1236	.notfound:
		1237	popa
		1238	stc
		1239	ret
71	diamond	1240
83	diamond	1241	fd_find_lfn:
		1242	; in: esi->name
		1243	; out: CF=1 - file not found
86	diamond	1244	; else CF=0 and edi->direntry, eax=directory cluster (0 for root)
83	diamond	1245	push esi edi
		1246	push 0
		1247	push flp_root_first
		1248	push flp_root_next
		1249	.loop:
		1250	call fat_find_lfn
		1251	jc .notfound
		1252	cmp byte [esi], 0
		1253	jz .found
		1254	test byte [edi+11], 10h
		1255	jz .notfound
		1256	movzx eax, word [edi+26] ; cluster
		1257	mov [esp+8], eax
		1258	mov dword [esp+4], flp_notroot_first
		1259	mov dword [esp], flp_notroot_next
		1260	jmp .loop
		1261	.notfound:
		1262	add esp, 12
		1263	pop edi esi
		1264	stc
		1265	ret
		1266	.found:
86	diamond	1267	mov eax, [esp+8]
131	diamond	1268	add eax, 31
		1269	cmp dword [esp], flp_root_next
		1270	jnz @f
		1271	add eax, -31+19
		1272	@@:
83	diamond	1273	add esp, 16 ; CF=0
		1274	pop esi
		1275	ret
		1276
71	diamond	1277	;----------------------------------------------------------------
		1278	;
		1279	; fs_FloppyRead - LFN variant for reading floppy
		1280	;
		1281	; esi points to filename
		1282	; ebx pointer to 64-bit number = first wanted byte, 0+
		1283	; may be ebx=0 - start from first byte
		1284	; ecx number of bytes to read, 0+
		1285	; edx mem location to return data
		1286	;
77	diamond	1287	; ret ebx = bytes read or 0xffffffff file not found
71	diamond	1288	; eax = 0 ok read or other = errormsg
		1289	;
		1290	;--------------------------------------------------------------
		1291	fs_FloppyRead:
75	diamond	1292	call read_flp_fat
		1293	cmp byte [esi], 0
		1294	jnz @f
		1295	or ebx, -1
		1296	mov eax, 10 ; access denied
		1297	ret
71	diamond	1298	@@:
75	diamond	1299	push edi
		1300	call fd_find_lfn
		1301	jnc .found
		1302	pop edi
		1303	or ebx, -1
		1304	mov eax, 5 ; file not found
		1305	ret
71	diamond	1306	.found:
75	diamond	1307	test ebx, ebx
		1308	jz .l1
		1309	cmp dword [ebx+4], 0
		1310	jz @f
77	diamond	1311	xor ebx, ebx
71	diamond	1312	.reteof:
75	diamond	1313	mov eax, 6 ; EOF
		1314	pop edi
		1315	ret
71	diamond	1316	@@:
75	diamond	1317	mov ebx, [ebx]
71	diamond	1318	.l1:
77	diamond	1319	push ecx edx
		1320	push 0
		1321	mov eax, [edi+28]
		1322	sub eax, ebx
		1323	jb .eof
		1324	cmp eax, ecx
		1325	jae @f
		1326	mov ecx, eax
		1327	mov byte [esp], 6 ; EOF
		1328	@@:
75	diamond	1329	movzx edi, word [edi+26]
71	diamond	1330	.new:
75	diamond	1331	jecxz .done
		1332	test edi, edi
		1333	jz .eof
		1334	cmp edi, 0xFF8
		1335	jae .eof
113	diamond	1336	sub ebx, 512
		1337	jae .skip
77	diamond	1338	lea eax, [edi+31]
75	diamond	1339	pusha
		1340	call read_chs_sector
		1341	popa
		1342	cmp [FDC_Status], 0
		1343	jnz .err
77	diamond	1344	lea eax, [0xD000+ebx+512]
75	diamond	1345	neg ebx
		1346	push ecx
		1347	cmp ecx, ebx
		1348	jbe @f
		1349	mov ecx, ebx
71	diamond	1350	@@:
75	diamond	1351	mov ebx, edx
		1352	call memmove
		1353	add edx, ecx
		1354	sub [esp], ecx
		1355	pop ecx
		1356	xor ebx, ebx
71	diamond	1357	.skip:
75	diamond	1358	movzx edi, word [edi*2+0x282000]
		1359	jmp .new
71	diamond	1360	.done:
77	diamond	1361	mov ebx, edx
		1362	pop eax edx ecx edi
		1363	sub ebx, edx
75	diamond	1364	ret
71	diamond	1365	.eof:
77	diamond	1366	mov ebx, edx
		1367	pop eax edx ecx
75	diamond	1368	jmp .reteof
71	diamond	1369	.err:
77	diamond	1370	mov ebx, edx
		1371	pop eax edx ecx edi
		1372	sub ebx, edx
83	diamond	1373	mov al, 11
75	diamond	1374	ret
		1375
		1376	;----------------------------------------------------------------
		1377	;
		1378	; fs_FloppyReadFolder - LFN variant for reading floppy folders
		1379	;
		1380	; esi points to filename
78	diamond	1381	; ebx pointer to structure: 32-bit number = first wanted block, 0+
		1382	; & flags (bitfields)
		1383	; flags: bit 0: 0=ANSI names, 1=UNICODE names
75	diamond	1384	; ecx number of blocks to read, 0+
		1385	; edx mem location to return data
		1386	;
77	diamond	1387	; ret ebx = blocks read or 0xffffffff folder not found
75	diamond	1388	; eax = 0 ok read or other = errormsg
		1389	;
		1390	;--------------------------------------------------------------
		1391	fs_FloppyReadFolder:
		1392	call read_flp_fat
		1393	push edi
		1394	cmp byte [esi], 0
		1395	jz .root
		1396	call fd_find_lfn
		1397	jnc .found
		1398	pop edi
		1399	or ebx, -1
		1400	mov eax, ERROR_FILE_NOT_FOUND
		1401	ret
		1402	.found:
		1403	test byte [edi+11], 0x10 ; do not allow read files
		1404	jnz .found_dir
		1405	pop edi
		1406	or ebx, -1
		1407	mov eax, ERROR_ACCESS_DENIED
		1408	ret
		1409	.found_dir:
		1410	movzx eax, word [edi+26]
		1411	add eax, 31
		1412	push 0
		1413	jmp .doit
		1414	.root:
		1415	mov eax, 19
		1416	push 14
		1417	.doit:
		1418	push ecx ebp
		1419	sub esp, 262*2 ; reserve space for LFN
		1420	mov ebp, esp
78	diamond	1421	push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE names
		1422	mov ebx, [ebx]
75	diamond	1423	; init header
		1424	push eax ecx
		1425	mov edi, edx
		1426	mov ecx, 32/4
		1427	xor eax, eax
		1428	rep stosd
		1429	pop ecx eax
		1430	mov byte [edx], 1 ; version
		1431	mov esi, edi ; esi points to BDFE
		1432	.main_loop:
		1433	pusha
		1434	call read_chs_sector
		1435	popa
		1436	cmp [FDC_Status], 0
		1437	jnz .error
		1438	mov edi, 0xD000
		1439	push eax
		1440	.l1:
		1441	call fat_get_name
		1442	jc .l2
		1443	cmp byte [edi+11], 0xF
		1444	jnz .do_bdfe
		1445	add edi, 0x20
		1446	cmp edi, 0xD200
		1447	jb .do_bdfe
		1448	pop eax
		1449	inc eax
		1450	dec byte [esp+262*2+12]
		1451	jz .done
		1452	jns @f
		1453	; read next sector from FAT
		1454	mov eax, [(eax-31-1)*2+0x282000]
		1455	and eax, 0xFFF
		1456	cmp eax, 0xFF8
		1457	jae .done
		1458	add eax, 31
		1459	mov byte [esp+262*2+12], 0
		1460	@@:
		1461	pusha
		1462	call read_chs_sector
		1463	popa
		1464	cmp [FDC_Status], 0
		1465	jnz .error
		1466	mov edi, 0xD000
		1467	push eax
		1468	.do_bdfe:
		1469	inc dword [edx+8] ; new file found
		1470	dec ebx
		1471	jns .l2
		1472	dec ecx
		1473	js .l2
		1474	inc dword [edx+4] ; new file block copied
		1475	call fat_entry_to_bdfe
		1476	.l2:
		1477	add edi, 0x20
		1478	cmp edi, 0xD200
		1479	jb .l1
		1480	pop eax
		1481	inc eax
		1482	dec byte [esp+262*2+12]
		1483	jz .done
		1484	jns @f
		1485	; read next sector from FAT
		1486	mov eax, [(eax-31-1)*2+0x282000]
		1487	and eax, 0xFFF
		1488	cmp eax, 0xFF8
		1489	jae .done
		1490	add eax, 31
		1491	mov byte [esp+262*2+12], 0
		1492	@@:
		1493	jmp .main_loop
		1494	.error:
		1495	add esp, 262*2+4
		1496	pop ebp ecx edi edi
		1497	or ebx, -1
		1498	mov eax, ERROR_FILE_NOT_FOUND
		1499	ret
		1500	.done:
		1501	add esp, 262*2+4
		1502	pop ebp
77	diamond	1503	mov ebx, [edx+4]
75	diamond	1504	xor eax, eax
		1505	dec ecx
		1506	js @f
		1507	mov al, ERROR_END_OF_FILE
		1508	@@:
		1509	pop ecx edi edi
		1510	ret
		1511
83	diamond	1512	;----------------------------------------------------------------
		1513	;
		1514	; fs_FloppyRewrite - LFN variant for writing sys floppy
		1515	;
		1516	; esi points to filename
		1517	; ebx ignored (reserved)
		1518	; ecx number of bytes to write, 0+
		1519	; edx mem location to data
		1520	;
		1521	; ret ebx = number of written bytes
		1522	; eax = 0 ok read or other = errormsg
		1523	;
		1524	;--------------------------------------------------------------
		1525	@@:
		1526	mov eax, ERROR_ACCESS_DENIED
		1527	xor ebx, ebx
		1528	ret
		1529	fsfrfe2:
		1530	popad
		1531	fsfrfe:
		1532	mov eax, 11
		1533	xor ebx, ebx
		1534	ret
		1535
		1536	fs_FloppyRewrite:
		1537	cmp byte [esi], 0
		1538	jz @b
		1539	call read_flp_fat
		1540	cmp [FDC_Status], 0
		1541	jnz fsfrfe
		1542	pushad
		1543	xor ebp, ebp
		1544	push esi
		1545	@@:
		1546	lodsb
		1547	test al, al
		1548	jz @f
		1549	cmp al, '/'
		1550	jnz @b
		1551	lea ebp, [esi-1]
		1552	jmp @b
		1553	@@:
		1554	pop esi
		1555	test ebp, ebp
		1556	jnz .noroot
		1557	call read_flp_root
		1558	cmp [FDC_Status], 0
		1559	jnz fsfrfe2
		1560	push flp_rootmem_extend_dir
		1561	push flp_rootmem_end_write
		1562	push flp_rootmem_next_write
		1563	push flp_rootmem_begin_write
		1564	xor ebp, ebp
		1565	push ebp
		1566	push flp_rootmem_first
		1567	push flp_rootmem_next
		1568	jmp .common1
		1569	.noroot:
		1570	; check existence
		1571	mov byte [ebp], 0
		1572	call fd_find_lfn
		1573	mov byte [ebp], '/'
		1574	lea esi, [ebp+1]
		1575	jnc @f
		1576	mov eax, ERROR_FILE_NOT_FOUND
		1577	.ret1:
		1578	mov [esp+28], eax
		1579	popad
		1580	xor ebx, ebx
		1581	ret
		1582	@@:
		1583	test byte [edi+11], 0x10 ; must be directory
		1584	mov eax, ERROR_ACCESS_DENIED
		1585	jz .ret1
		1586	movzx ebp, word [edi+26] ; ebp=cluster
		1587	mov eax, ERROR_FAT_TABLE
		1588	cmp ebp, 2
		1589	jb .ret1
		1590	cmp ebp, 2849
		1591	jae .ret1
		1592	push flp_notroot_extend_dir
		1593	push flp_notroot_end_write
		1594	push flp_notroot_next_write
		1595	push flp_notroot_begin_write
		1596	push ebp
		1597	push flp_notroot_first
		1598	push flp_notroot_next
		1599	.common1:
		1600	call fat_find_lfn
		1601	jc .notfound
91	diamond	1602	; found; must not be directory
		1603	test byte [edi+11], 10h
		1604	jz @f
		1605	add esp, 28
		1606	popad
		1607	mov eax, ERROR_ACCESS_DENIED
		1608	xor ebx, ebx
		1609	ret
		1610	@@:
		1611	; delete FAT chain
83	diamond	1612	push edi
		1613	xor eax, eax
		1614	mov dword [edi+28], eax ; zero size
		1615	xchg ax, word [edi+26] ; start cluster
		1616	test eax, eax
		1617	jz .done1
		1618	@@:
		1619	cmp eax, 0xFF8
		1620	jae .done1
		1621	lea edi, [0x282000 + eax*2] ; position in FAT
		1622	xor eax, eax
		1623	xchg ax, [edi]
		1624	jmp @b
		1625	.done1:
		1626	pop edi
		1627	call get_time_for_file
		1628	mov [edi+22], ax
		1629	call get_date_for_file
		1630	mov [edi+24], ax
		1631	mov [edi+18], ax
		1632	or byte [edi+11], 20h ; set 'archive' attribute
		1633	jmp .doit
		1634	.notfound:
		1635	; file is not found; generate short name
		1636	call fat_name_is_legal
		1637	jc @f
		1638	add esp, 28
		1639	popad
		1640	mov eax, ERROR_FILE_NOT_FOUND
		1641	xor ebx, ebx
		1642	ret
		1643	@@:
		1644	sub esp, 12
		1645	mov edi, esp
		1646	call fat_gen_short_name
		1647	.test_short_name_loop:
		1648	push esi edi ecx
		1649	mov esi, edi
		1650	lea eax, [esp+12+12+8]
		1651	mov [eax], ebp
		1652	call dword [eax-4]
		1653	jc .found
		1654	.test_short_name_entry:
		1655	cmp byte [edi+11], 0xF
		1656	jz .test_short_name_cont
		1657	mov ecx, 11
		1658	push esi edi
		1659	repz cmpsb
		1660	pop edi esi
		1661	jz .short_name_found
		1662	.test_short_name_cont:
		1663	lea eax, [esp+12+12+8]
		1664	call dword [eax-8]
		1665	jnc .test_short_name_entry
		1666	jmp .found
		1667	.short_name_found:
		1668	pop ecx edi esi
		1669	call fat_next_short_name
		1670	jnc .test_short_name_loop
		1671	.disk_full:
		1672	add esp, 12+28
		1673	popa
		1674	mov eax, ERROR_DISK_FULL
		1675	xor ebx, ebx
		1676	ret
		1677	.found:
		1678	pop ecx edi esi
		1679	; now find space in directory
		1680	; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~'
		1681	mov al, '~'
		1682	push ecx edi
		1683	mov ecx, 8
		1684	repnz scasb
		1685	push 1
		1686	pop eax ; 1 entry
		1687	jnz .notilde
		1688	; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total
		1689	xor eax, eax
		1690	@@:
		1691	cmp byte [esi], 0
		1692	jz @f
		1693	inc esi
		1694	inc eax
		1695	jmp @b
		1696	@@:
		1697	sub esi, eax
		1698	add eax, 12+13
		1699	mov ecx, 13
		1700	push edx
		1701	cdq
		1702	div ecx
		1703	pop edx
		1704	.notilde:
		1705	push -1
		1706	push -1
		1707	; find successive entries in directory
		1708	xor ecx, ecx
		1709	push eax
		1710	lea eax, [esp+12+8+12+8]
		1711	mov [eax], ebp
		1712	call dword [eax-4]
		1713	pop eax
		1714	jnc .scan_dir
		1715	.fsfrfe3:
		1716	add esp, 8+8+12+28
		1717	popad
		1718	mov eax, 11
		1719	xor ebx, ebx
		1720	ret
		1721	.scan_dir:
		1722	cmp byte [edi], 0
		1723	jz .free
		1724	cmp byte [edi], 0xE5
		1725	jz .free
		1726	xor ecx, ecx
		1727	.scan_cont:
		1728	push eax
		1729	lea eax, [esp+12+8+12+8]
		1730	call dword [eax-8]
		1731	pop eax
		1732	jnc .scan_dir
		1733	cmp [FDC_Status], 0
		1734	jnz .fsfrfe3
		1735	push eax
		1736	lea eax, [esp+12+8+12+8]
		1737	call dword [eax+16] ; extend directory
		1738	pop eax
		1739	jnc .scan_dir
		1740	add esp, 8+8+12+28
		1741	popad
		1742	mov eax, ERROR_DISK_FULL
		1743	xor ebx, ebx
		1744	ret
		1745	.free:
		1746	test ecx, ecx
		1747	jnz @f
		1748	mov [esp], edi
		1749	mov ecx, [esp+8+8+12+8]
		1750	mov [esp+4], ecx
		1751	xor ecx, ecx
		1752	@@:
		1753	inc ecx
		1754	cmp ecx, eax
		1755	jb .scan_cont
		1756	; found!
		1757	; calculate name checksum
		1758	push esi ecx
		1759	mov esi, [esp+8+8]
		1760	mov ecx, 11
		1761	xor eax, eax
		1762	@@:
		1763	ror al, 1
		1764	add al, [esi]
		1765	inc esi
		1766	loop @b
		1767	pop ecx esi
		1768	pop edi
		1769	pop dword [esp+8+12+8]
		1770	; edi points to first entry in free chunk
		1771	dec ecx
		1772	jz .nolfn
		1773	push esi
		1774	push eax
		1775	lea eax, [esp+8+8+12+8]
		1776	call dword [eax+4] ; begin write
		1777	mov al, 40h
		1778	.writelfn:
		1779	or al, cl
		1780	mov esi, [esp+4]
		1781	push ecx
		1782	dec ecx
		1783	imul ecx, 13
		1784	add esi, ecx
		1785	stosb
		1786	mov cl, 5
		1787	call fs_RamdiskRewrite.read_symbols
		1788	mov ax, 0xF
		1789	stosw
		1790	mov al, [esp+4]
		1791	stosb
		1792	mov cl, 6
		1793	call fs_RamdiskRewrite.read_symbols
		1794	xor eax, eax
		1795	stosw
		1796	mov cl, 2
		1797	call fs_RamdiskRewrite.read_symbols
		1798	pop ecx
		1799	lea eax, [esp+8+8+12+8]
		1800	call dword [eax+8] ; next write
		1801	xor eax, eax
		1802	loop .writelfn
		1803	pop eax
		1804	pop esi
		1805	; lea eax, [esp+8+12+8]
		1806	; call dword [eax+12] ; end write
		1807	.nolfn:
		1808	xchg esi, [esp]
		1809	mov ecx, 11
		1810	rep movsb
		1811	mov word [edi], 20h ; attributes
		1812	sub edi, 11
		1813	pop esi ecx
		1814	add esp, 12
		1815	mov byte [edi+13], 0 ; tenths of a second at file creation time
		1816	call get_time_for_file
		1817	mov [edi+14], ax ; creation time
		1818	mov [edi+22], ax ; last write time
		1819	call get_date_for_file
		1820	mov [edi+16], ax ; creation date
		1821	mov [edi+24], ax ; last write date
		1822	mov [edi+18], ax ; last access date
		1823	and word [edi+20], 0 ; high word of cluster
		1824	and word [edi+26], 0 ; low word of cluster - to be filled
		1825	and dword [edi+28], 0 ; file size - to be filled
		1826	.doit:
		1827	lea eax, [esp+8]
		1828	call dword [eax+12] ; flush directory
		1829	push ecx
		1830	push edi
133	diamond	1831	push 0
83	diamond	1832	mov esi, edx
		1833	jecxz .done
		1834	mov ecx, 2849
		1835	mov edi, 0x282000
		1836	push 0 ; first cluster
		1837	.write_loop:
		1838	; allocate new cluster
		1839	xor eax, eax
		1840	repnz scasw
		1841	mov al, ERROR_DISK_FULL
		1842	jnz .ret
		1843	dec edi
		1844	dec edi
		1845	lea eax, [edi-0x282000]
		1846	shr eax, 1 ; eax = cluster
		1847	mov word [edi], 0xFFF ; mark as last cluster
133	diamond	1848	xchg edi, [esp+4]
83	diamond	1849	cmp dword [esp], 0
		1850	jz .first
		1851	stosw
		1852	jmp @f
		1853	.first:
		1854	mov [esp], eax
		1855	@@:
133	diamond	1856	mov edi, [esp+4]
83	diamond	1857	inc ecx
		1858	; write data
		1859	push ecx edi
		1860	mov ecx, 512
		1861	cmp dword [esp+20], ecx
		1862	jae @f
		1863	mov ecx, [esp+20]
		1864	@@:
		1865	push ecx
		1866	mov edi, 0xD000
		1867	rep movsb
		1868	pop ecx
		1869	push ecx
		1870	sub ecx, 512
		1871	neg ecx
		1872	push eax
		1873	xor eax, eax
		1874	rep stosb
		1875	pop eax
		1876	add eax, 31
		1877	pusha
		1878	call save_chs_sector
		1879	popa
		1880	pop ecx
		1881	cmp [FDC_Status], 0
		1882	jnz .diskerr
		1883	sub [esp+20], ecx
		1884	pop edi ecx
		1885	jnz .write_loop
		1886	.done:
		1887	xor eax, eax
		1888	.ret:
		1889	pop ebx edi edi ecx
		1890	mov [esp+28+28], eax
		1891	lea eax, [esp+8]
		1892	call dword [eax+4]
		1893	mov [edi+26], bx
		1894	mov ebx, esi
		1895	sub ebx, edx
		1896	mov [edi+28], ebx
		1897	call dword [eax+12]
		1898	mov [esp+28+16], ebx
		1899	test ebp, ebp
		1900	jnz @f
		1901	call save_flp_root
		1902	@@:
		1903	add esp, 28
		1904	cmp [FDC_Status], 0
		1905	jnz .err3
		1906	call save_flp_fat
		1907	cmp [FDC_Status], 0
		1908	jnz .err3
		1909	popa
		1910	ret
		1911	.err3:
		1912	popa
		1913	mov al, 11
		1914	xor ebx, ebx
		1915	ret
		1916	.diskerr:
		1917	sub esi, ecx
		1918	mov eax, 11
		1919	pop edi ecx
		1920	jmp .ret
		1921
131	diamond	1922	;----------------------------------------------------------------
		1923	;
		1924	; fs_FloppyWrite - LFN variant for writing to floppy
		1925	;
		1926	; esi points to filename
		1927	; ebx pointer to 64-bit number = first wanted byte, 0+
		1928	; may be ebx=0 - start from first byte
		1929	; ecx number of bytes to write, 0+
		1930	; edx mem location to data
		1931	;
		1932	; ret ebx = bytes written (maybe 0)
		1933	; eax = 0 ok write or other = errormsg
		1934	;
		1935	;--------------------------------------------------------------
		1936
		1937	@@:
		1938	push ERROR_ACCESS_DENIED
		1939	fs_FloppyWrite.ret0:
		1940	pop eax
		1941	xor ebx, ebx
		1942	ret
		1943
		1944	fs_FloppyWrite.ret11:
		1945	push 11
		1946	jmp fs_FloppyWrite.ret0
		1947
		1948	fs_FloppyWrite:
		1949	cmp byte [esi], 0
		1950	jz @b
		1951	call read_flp_fat
		1952	cmp [FDC_Status], 0
		1953	jnz .ret11
		1954	pushad
		1955	call fd_find_lfn
		1956	jnc .found
		1957	popad
		1958	push ERROR_FILE_NOT_FOUND
		1959	jmp .ret0
		1960	.found:
		1961	; FAT does not support files larger than 4GB
		1962	test ebx, ebx
		1963	jz .l1
		1964	cmp dword [ebx+4], 0
		1965	jz @f
		1966	.eof:
		1967	popad
		1968	push ERROR_END_OF_FILE
		1969	jmp .ret0
		1970	@@:
		1971	mov ebx, [ebx]
		1972	.l1:
		1973	; now edi points to direntry, ebx=start byte to write,
		1974	; ecx=number of bytes to write, edx=data pointer
		1975
		1976	; extend file if needed
		1977	add ecx, ebx
		1978	jc .eof ; FAT does not support files larger than 4GB
		1979	push eax ; save directory cluster
		1980	push 0 ; return value=0
		1981
		1982	call get_time_for_file
		1983	mov [edi+22], ax ; last write time
		1984	call get_date_for_file
		1985	mov [edi+24], ax ; last write date
		1986	mov [edi+18], ax ; last access date
		1987
		1988	push dword [edi+28] ; save current file size
		1989	cmp ecx, [edi+28]
		1990	jbe .length_ok
		1991	cmp ecx, ebx
		1992	jz .length_ok
		1993	call floppy_extend_file
		1994	jnc .length_ok
		1995	mov [esp+4], eax
		1996	; floppy_extend_file can return two error codes: FAT table error or disk full.
		1997	; First case is fatal error, in second case we may write some data
		1998	cmp al, ERROR_DISK_FULL
		1999	jz .disk_full
		2000	pop eax
		2001	pop eax
		2002	mov [esp+4+28], eax
		2003	pop eax
		2004	popad
		2005	xor ebx, ebx
		2006	ret
		2007	.disk_full:
		2008	; correct number of bytes to write
		2009	mov ecx, [edi+28]
		2010	cmp ecx, ebx
		2011	ja .length_ok
		2012	.ret:
		2013	pop eax
		2014	pop eax
		2015	mov [esp+4+28], eax ; eax=return value
		2016	pop eax
		2017	sub edx, [esp+20]
		2018	mov [esp+16], edx ; ebx=number of written bytes
		2019	popad
		2020	ret
		2021	.length_ok:
		2022	; save FAT & directory
		2023	; note that directory must be saved first because save_flp_fat uses buffer at 0xD000
		2024	mov esi, [edi+28]
		2025	movzx edi, word [edi+26] ; starting cluster
		2026	mov eax, [esp+8]
		2027	pusha
		2028	call save_chs_sector
		2029	popa
		2030	cmp [FDC_Status], 0
		2031	jnz .device_err
		2032	call save_flp_fat
		2033	cmp [FDC_Status], 0
		2034	jz @f
		2035	.device_err:
		2036	mov byte [esp+4], 11
		2037	jmp .ret
		2038	@@:
		2039
		2040	; now ebx=start pos, ecx=end pos, both lie inside file
		2041	sub ecx, ebx
		2042	jz .ret
		2043	call SetUserInterrupts
		2044	.write_loop:
		2045	lea eax, [edi+31] ; current sector
		2046	; get length of data in current sector
		2047	push ecx
		2048	sub ebx, 0x200
		2049	jb .hasdata
		2050	neg ebx
		2051	xor ecx, ecx
		2052	jmp @f
		2053	.hasdata:
		2054	neg ebx
		2055	cmp ecx, ebx
		2056	jbe @f
		2057	mov ecx, ebx
		2058	@@:
		2059	; load sector if needed
		2060	cmp dword [esp+4], 0 ; we don't need to read uninitialized data
		2061	jz .noread
		2062	cmp ecx, 0x200 ; we don't need to read sector if it is fully rewritten
		2063	jz .noread
		2064	cmp ecx, esi ; (same for the last sector)
		2065	jz .noread
		2066	pusha
		2067	call read_chs_sector
		2068	popa
		2069	cmp [FDC_Status], 0
		2070	jz @f
		2071	.device_err2:
		2072	pop ecx
		2073	jmp .device_err
		2074	@@:
		2075	.noread:
		2076	; zero uninitialized data if file was extended (because floppy_extend_file does not this)
		2077	push eax ecx edi
		2078	xor eax, eax
		2079	mov ecx, 0x200
		2080	sub ecx, [esp+4+12]
		2081	jbe @f
		2082	mov edi, 0xD000
		2083	add edi, [esp+4+12]
		2084	rep stosb
		2085	@@:
		2086	; zero uninitialized data in the last sector
		2087	mov ecx, 0x200
		2088	sub ecx, esi
		2089	jbe @f
		2090	mov edi, 0xD000
		2091	add edi, esi
		2092	rep stosb
		2093	@@:
		2094	pop edi ecx eax
		2095	; copy new data
		2096	push eax
		2097	mov eax, edx
		2098	neg ebx
		2099	jecxz @f
		2100	add ebx, 0xD000+0x200
		2101	call memmove
		2102	xor ebx, ebx
		2103	@@:
		2104	pop eax
		2105	; save sector
		2106	pusha
		2107	call save_chs_sector
		2108	popa
		2109	cmp [FDC_Status], 0
		2110	jnz .device_err2
		2111	add edx, ecx
		2112	sub [esp], ecx
		2113	pop ecx
		2114	jz .done
		2115	.next_cluster:
		2116	movzx edi, word [edi*2+0x282000]
		2117	sub esi, 0x200
		2118	jae @f
		2119	xor esi, esi
		2120	@@:
		2121	sub dword [esp], 0x200
		2122	jae .write_loop
		2123	and dword [esp], 0
		2124	jmp .write_loop
		2125	.done:
		2126	mov [fdc_irq_func], fdc_null
		2127	jmp .ret
		2128
		2129	floppy_extend_file.zero_size:
		2130	xor eax, eax
		2131	jmp floppy_extend_file.start_extend
		2132
		2133	; extends file on floppy to given size (new data area is undefined)
		2134	; in: edi->direntry, ecx=new size
133	diamond	2135	; out: CF=0 => OK, eax=0
131	diamond	2136	; CF=1 => error, eax=code (ERROR_FAT_TABLE or ERROR_DISK_FULL)
		2137	floppy_extend_file:
		2138	push ecx
		2139	; find the last cluster of file
		2140	movzx eax, word [edi+26] ; first cluster
		2141	mov ecx, [edi+28]
		2142	jecxz .zero_size
		2143	@@:
		2144	sub ecx, 0x200
		2145	jbe @f
		2146	mov eax, [eax*2+0x282000]
		2147	and eax, 0xFFF
		2148	jz .fat_err
		2149	cmp eax, 0xFF8
		2150	jb @b
		2151	.fat_err:
		2152	pop ecx
		2153	push ERROR_FAT_TABLE
		2154	pop eax
		2155	stc
		2156	ret
		2157	@@:
		2158	push eax
		2159	mov eax, [eax*2+0x282000]
		2160	and eax, 0xFFF
		2161	cmp eax, 0xFF8
		2162	pop eax
		2163	jb .fat_err
		2164	; set length to full number of sectors
		2165	sub [edi+28], ecx
		2166	.start_extend:
		2167	pop ecx
		2168	; now do extend
		2169	push edx esi
		2170	mov esi, 0x282000+2*2 ; start scan from cluster 2
		2171	mov edx, 2847 ; number of clusters to scan
		2172	.extend_loop:
		2173	cmp [edi+28], ecx
		2174	jae .extend_done
		2175	; add new sector
		2176	push ecx
		2177	push edi
		2178	.scan:
		2179	mov ecx, edx
		2180	mov edi, esi
		2181	jecxz .disk_full
		2182	push eax
		2183	xor eax, eax
		2184	repnz scasw
		2185	pop eax
		2186	jnz .disk_full
		2187	mov word [edi-2], 0xFFF
		2188	mov esi, edi
		2189	mov edx, ecx
		2190	sub edi, 0x282000
		2191	shr edi, 1
		2192	dec edi ; now edi=new cluster
		2193	test eax, eax
		2194	jz .first_cluster
		2195	mov [0x282000+eax*2], di
		2196	jmp @f
		2197	.first_cluster:
		2198	pop eax ; eax->direntry
		2199	push eax
		2200	mov [eax+26], di
		2201	@@:
		2202	mov eax, edi ; eax=new cluster
		2203	pop edi ; edi->direntry
		2204	pop ecx ; ecx=required size
		2205	add dword [edi+28], 0x200
		2206	jmp .extend_loop
		2207	.extend_done:
		2208	mov [edi+28], ecx
		2209	pop esi edx
133	diamond	2210	xor eax, eax ; CF=0
131	diamond	2211	ret
		2212	.disk_full:
		2213	pop edi ecx
		2214	pop esi edx
		2215	stc
		2216	push ERROR_DISK_FULL
		2217	pop eax
		2218	ret
		2219
133	diamond	2220	;----------------------------------------------------------------
		2221	;
		2222	; fs_FloppySetFileEnd - set end of file on floppy
		2223	;
		2224	; esi points to filename
		2225	; ebx points to 64-bit number = new file size
		2226	; ecx ignored (reserved)
		2227	; edx ignored (reserved)
		2228	;
		2229	; ret eax = 0 ok or other = errormsg
		2230	;
		2231	;--------------------------------------------------------------
		2232	fs_FloppySetFileEnd:
		2233	call read_flp_fat
		2234	cmp [FDC_Status], 0
		2235	jnz ret11
		2236	cmp byte [esi], 0
		2237	jnz @f
		2238	.access_denied:
		2239	push ERROR_ACCESS_DENIED
		2240	jmp .ret
		2241	@@:
		2242	push edi
		2243	call fd_find_lfn
		2244	jnc @f
		2245	pop edi
		2246	push ERROR_FILE_NOT_FOUND
		2247	.ret:
		2248	pop eax
		2249	jmp .doret
		2250	@@:
		2251	; must not be directory
		2252	test byte [edi+11], 10h
		2253	jz @f
		2254	pop edi
		2255	jmp .access_denied
		2256	@@:
		2257	; file size must not exceed 4 Gb
		2258	cmp dword [ebx+4], 0
		2259	jz @f
		2260	pop edi
		2261	push ERROR_END_OF_FILE
		2262	jmp .ret
		2263	@@:
		2264	push eax
		2265	; set file modification date/time to current
		2266	call fat_update_datetime
		2267	mov eax, [ebx]
		2268	cmp eax, [edi+28]
		2269	jb .truncate
		2270	ja .expand
		2271	pop eax
		2272	pushad
		2273	call save_chs_sector
		2274	popad
		2275	pop edi
		2276	xor eax, eax
		2277	cmp [FDC_Status], 0
		2278	jz @f
		2279	mov al, 11
		2280	@@:
		2281	.doret:
		2282	mov [fdc_irq_func], fdc_null
		2283	ret
		2284	.expand:
		2285	push ecx
		2286	push dword [edi+28] ; save old size
		2287	mov ecx, eax
		2288	call floppy_extend_file
		2289	push eax ; return code
		2290	jnc .expand_ok
		2291	cmp al, ERROR_DISK_FULL
		2292	jz .disk_full
		2293	pop eax ecx ecx edi edi
		2294	jmp .doret
		2295	.device_err:
		2296	pop eax
		2297	.device_err2:
		2298	pop ecx ecx eax edi
		2299	push 11
		2300	jmp .ret
		2301	.disk_full:
		2302	.expand_ok:
		2303	; save directory & FAT
		2304	mov eax, [edi+28]
		2305	xchg eax, [esp+12]
		2306	movzx edi, word [edi+26]
		2307	pusha
		2308	call save_chs_sector
		2309	popa
		2310	cmp [FDC_Status], 0
		2311	jnz .device_err
		2312	call save_flp_fat
		2313	cmp [FDC_Status], 0
		2314	jnz .device_err
		2315	call SetUserInterrupts
		2316	; now zero new data
		2317	; edi = current cluster, [esp+12]=new size, [esp+4]=old size, [esp]=return code
		2318	.zero_loop:
		2319	sub dword [esp+4], 0x200
		2320	jae .next_cluster
		2321	cmp dword [esp+4], -0x200
		2322	jz .noread
		2323	lea eax, [edi+31]
		2324	pusha
		2325	call read_chs_sector
		2326	popa
		2327	cmp [FDC_Status], 0
		2328	jnz .err_next
		2329	.noread:
		2330	mov ecx, [esp+4]
		2331	neg ecx
		2332	push edi
		2333	mov edi, 0xD000+0x200
		2334	add edi, [esp+8]
		2335	xor eax, eax
		2336	mov [esp+8], eax
		2337	rep stosb
		2338	pop edi
		2339	lea eax, [edi+31]
		2340	pusha
		2341	call save_chs_sector
		2342	popa
		2343	cmp [FDC_Status], 0
		2344	jz .next_cluster
		2345	.err_next:
		2346	mov byte [esp], 11
		2347	.next_cluster:
		2348	sub dword [esp+12], 0x200
		2349	jbe .expand_done
		2350	movzx edi, word [0x282000+edi*2]
		2351	jmp .zero_loop
		2352	.expand_done:
		2353	pop eax ecx ecx edi edi
		2354	jmp .doret
		2355	.truncate:
		2356	mov [edi+28], eax
		2357	push ecx
		2358	movzx ecx, word [edi+26]
		2359	test eax, eax
		2360	jz .zero_size
		2361	; find new last sector
		2362	@@:
		2363	sub eax, 0x200
		2364	jbe @f
		2365	movzx ecx, word [0x282000+ecx*2]
		2366	jmp @b
		2367	@@:
		2368	; we will zero data at the end of last sector - remember it
		2369	push ecx
		2370	; terminate FAT chain
		2371	lea ecx, [0x282000+ecx+ecx]
		2372	push dword [ecx]
		2373	mov word [ecx], 0xFFF
		2374	pop ecx
		2375	and ecx, 0xFFF
		2376	jmp .delete
		2377	.zero_size:
		2378	and word [edi+26], 0
		2379	push 0
		2380	.delete:
		2381	; delete FAT chain starting with ecx
		2382	; mark all clusters as free
		2383	cmp ecx, 0xFF8
		2384	jae .deleted
		2385	lea ecx, [0x282000+ecx+ecx]
		2386	push dword [ecx]
		2387	and word [ecx], 0
		2388	pop ecx
		2389	and ecx, 0xFFF
		2390	jmp .delete
		2391	.deleted:
		2392	mov edi, [edi+28]
		2393	; save directory & FAT
		2394	mov eax, [esp+8]
		2395	pusha
		2396	call save_chs_sector
		2397	popa
		2398	cmp [FDC_Status], 0
		2399	jnz .device_err2
		2400	call save_flp_fat
		2401	cmp [FDC_Status], 0
		2402	jnz .device_err2
		2403	; zero last sector, ignore errors
		2404	pop eax
		2405	add eax, 31
		2406	and edi, 0x1FF
		2407	jz .truncate_done
		2408	call SetUserInterrupts
		2409	pusha
		2410	call read_chs_sector
		2411	popa
		2412	add edi, 0xD000
		2413	mov ecx, 0xD000+0x200
		2414	sub ecx, edi
		2415	push eax
		2416	xor eax, eax
		2417	rep stosb
		2418	pop eax
		2419	pusha
		2420	call save_chs_sector
		2421	popa
		2422	.truncate_done:
		2423	pop ecx eax edi
		2424	xor eax, eax
		2425	jmp .doret
		2426
86	diamond	2427	fs_FloppyGetFileInfo:
		2428	call read_flp_fat
		2429	cmp [FDC_Status], 0
		2430	jnz ret11
		2431	cmp byte [esi], 0
		2432	jnz @f
		2433	mov eax, 2 ; unsupported
		2434	ret
		2435	@@:
		2436	push edi
		2437	call fd_find_lfn
		2438	jmp fs_GetFileInfo_finish
		2439
		2440	ret11:
		2441	mov eax, 11
		2442	ret
		2443
		2444	fs_FloppySetFileInfo:
		2445	call read_flp_fat
		2446	cmp [FDC_Status], 0
		2447	jnz ret11
		2448	cmp byte [esi], 0
		2449	jnz @f
		2450	mov eax, 2 ; unsupported
		2451	ret
		2452	@@:
		2453	push edi
		2454	call fd_find_lfn
		2455	jnc @f
		2456	pop edi
		2457	mov eax, ERROR_FILE_NOT_FOUND
		2458	ret
		2459	@@:
		2460	push eax
		2461	call bdfe_to_fat_entry
		2462	pop eax
		2463	pusha
		2464	call save_chs_sector
		2465	popa
		2466	pop edi
		2467	xor eax, eax
		2468	cmp [FDC_Status], 0
		2469	jz @f
		2470	mov al, 11
		2471	@@:
		2472	ret
		2473
91	diamond	2474	;----------------------------------------------------------------
		2475	;
		2476	; fs_FloppyExecute - LFN variant for executing from floppy
		2477	;
		2478	; esi points to floppy filename (e.g. 'dir1/name')
		2479	; ebp points to full filename (e.g. '/fd/1/dir1/name')
		2480	; dword [ebx] = flags
		2481	; dword [ebx+4] = cmdline
		2482	;
		2483	; ret ebx,edx destroyed
		2484	; eax > 0 - PID, < 0 - error
		2485	;
		2486	;--------------------------------------------------------------
		2487	fs_FloppyExecute:
		2488	mov edx, [ebx]
		2489	mov ebx, [ebx+4]
		2490	test ebx, ebx
		2491	jz @f
		2492	add ebx, std_application_base_address
		2493	@@:
		2494
		2495	;----------------------------------------------------------------
		2496	;
		2497	; fs_FloppyExecute.flags - second entry
		2498	;
		2499	; esi points to floppy filename (kernel address)
		2500	; ebp points to full filename
		2501	; edx flags
		2502	; ebx cmdline (kernel address)
		2503	;
		2504	; ret eax > 0 - PID, < 0 - error
		2505	;
		2506	;--------------------------------------------------------------
		2507
		2508	.flags:
		2509	call read_flp_fat
		2510	cmp byte [esi], 0
		2511	jnz @f
		2512	; cannot execute root!
		2513	mov eax, -ERROR_ACCESS_DENIED
		2514	ret
		2515	@@:
		2516	push edi
		2517	call fd_find_lfn
		2518	jnc .found
		2519	pop edi
		2520	mov eax, -ERROR_FILE_NOT_FOUND
		2521	ret
		2522	.found:
		2523	movzx eax, word [edi+26] ; cluster
		2524	push eax
		2525	push dword [edi+28] ; size
		2526	push .DoRead
		2527	call fs_execute
		2528	add esp, 12
		2529	pop edi
		2530	ret
		2531
		2532	.DoRead:
		2533	; read next block
		2534	; in: eax->parameters, edi->buffer
		2535	; out: eax = error code
		2536	pushad
		2537	cmp dword [eax], 0 ; file size
		2538	jz .eof
		2539	mov eax, [eax+4] ; cluster
		2540	add eax, 31
		2541	call read_chs_sector
		2542	cmp [FDC_Status], 0
		2543	jnz .err
		2544	pop edi
		2545	mov esi, 0xD000
		2546	push edi
		2547	mov ecx, 512/4
		2548	rep movsd
		2549	mov eax, [esp+28]
		2550	mov ecx, [eax]
		2551	sub ecx, 512
		2552	jae @f
		2553	add edi, ecx
		2554	neg ecx
		2555	push eax
		2556	xor eax, eax
		2557	rep stosb
		2558	pop eax
		2559	@@:
		2560	mov [eax], ecx
		2561	mov edx, [eax+4]
		2562	mov dx, [edx*2+0x282000]
		2563	mov [eax+4], dx ; high word is already zero
		2564	popad
		2565	xor eax, eax
		2566	ret
		2567	.eof:
		2568	popad
		2569	mov eax, 6
		2570	ret
		2571	.err:
		2572	popad
		2573	mov eax, 11
		2574	ret
		2575
78	diamond	2576	; \end{diamond}

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(root)/kernel/trunk/fs/fat12.inc – Rev 133