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
		36	mov eax,[eax+0x3000+4]
		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
		52	mov eax,0x282000
		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
		68
		69
		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
		118	mov eax,10
		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
		234	read_chs_sector:
		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 ; ��
		276	mov [FDD_Sector],2 ; ��
		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 ; ��
		305	mov [FDD_Sector],2 ; ��
		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
		361	add edi,4
		362	add esi,12
		363
		364	cmp edi,0x282000+2856*2 ;2849 clusters
		365	jnz fcnew_1
		366
		367	popad
		368	ret
		369
		370	check_label:
		371	pushad
		372	mov [FDD_Track],0 ; ��
		373	mov [FDD_Head],0 ; ��
		374	mov [FDD_Sector],1 ; ��
		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
		385	jne fdc_status_error
		386	mov esi,flp_label
		387	mov edi,0xD000+39
		388	mov ecx,15
		389	cld
		390	rep cmpsb
		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 ; ��
		415	mov [FDD_Sector],2 ; ��
		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
		433
		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 ; ��
		444	mov [FDD_Sector],2 ; ��
		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
		470
		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
		566	jc frnoreadd_1_1
		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
		620	; 5 - file not found / directory not found
		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:
		647	popa
		648	add esp,32
		649	jmp fdc_status_error_1
		650
		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
		752	call frnewds_2
		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
		814	je fdc_status_error_8
		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
		824
		825	calculate_chs:
		826	mov bl,[FDD_Track]
		827	mov [old_track],bl
		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
		849
		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
		895
		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
		911
		912
		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
		924
		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
		934
		935	add ebx,32
		936	loop adr1_analyze_flp
		937
		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
		945	not_found_file_analyze_flp:
		946	pop edi
		947	pop esi
		948	pop edx
		949	pop ecx
		950	add esp,4
		951	stc ;file not found
		952	ret
		953
		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
		962
		963
		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	;--------------------------------
		973
		974	push ecx
		975	push edx
		976	push esi
		977
		978	adr561:
		979	mov [clust_tmp_flp],eax
		980	add eax,31
		981	pusha
		982	call read_chs_sector
		983	popa
		984	cmp [FDC_Status],0
		985	jne error_found_file_analyze1
		986
		987	mov ecx,512/32
		988	mov ebx,0xD000
		989
		990	adr1_analyze1:
		991	cmp byte [ebx],0x00
		992	je found_file_analyze1
		993	cmp byte [ebx],0xe5
		994	je found_file_analyze1
		995
		996	avanti:
		997	add ebx,32
		998	loop adr1_analyze1
		999
		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
		1007
		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
		1013
		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
		1031	call save_chs_sector
		1032	popa
		1033	cmp [FDC_Status],0
		1034	jne error_found_file_analyze1
		1035	mov ebx,0xD000
		1036
		1037	found_file_analyze1:
		1038
		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
		1050	ret
		1051
		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
		1058
		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
		1244	; else CF=0 and edi->direntry
		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:
		1267	add esp, 16 ; CF=0
		1268	pop esi
		1269	ret
		1270
71	diamond	1271	;----------------------------------------------------------------
		1272	;
		1273	; fs_FloppyRead - LFN variant for reading floppy
		1274	;
		1275	; esi points to filename
		1276	; ebx pointer to 64-bit number = first wanted byte, 0+
		1277	; may be ebx=0 - start from first byte
		1278	; ecx number of bytes to read, 0+
		1279	; edx mem location to return data
		1280	;
77	diamond	1281	; ret ebx = bytes read or 0xffffffff file not found
71	diamond	1282	; eax = 0 ok read or other = errormsg
		1283	;
		1284	;--------------------------------------------------------------
		1285	fs_FloppyRead:
75	diamond	1286	call read_flp_fat
		1287	cmp byte [esi], 0
		1288	jnz @f
		1289	or ebx, -1
		1290	mov eax, 10 ; access denied
		1291	ret
71	diamond	1292	@@:
75	diamond	1293	push edi
		1294	call fd_find_lfn
		1295	jnc .found
		1296	pop edi
		1297	or ebx, -1
		1298	mov eax, 5 ; file not found
		1299	ret
71	diamond	1300	.found:
75	diamond	1301	test ebx, ebx
		1302	jz .l1
		1303	cmp dword [ebx+4], 0
		1304	jz @f
77	diamond	1305	xor ebx, ebx
71	diamond	1306	.reteof:
75	diamond	1307	mov eax, 6 ; EOF
		1308	pop edi
		1309	ret
71	diamond	1310	@@:
75	diamond	1311	mov ebx, [ebx]
71	diamond	1312	.l1:
77	diamond	1313	push ecx edx
		1314	push 0
		1315	mov eax, [edi+28]
		1316	sub eax, ebx
		1317	jb .eof
		1318	cmp eax, ecx
		1319	jae @f
		1320	mov ecx, eax
		1321	mov byte [esp], 6 ; EOF
		1322	@@:
75	diamond	1323	movzx edi, word [edi+26]
71	diamond	1324	.new:
75	diamond	1325	jecxz .done
		1326	test edi, edi
		1327	jz .eof
		1328	cmp edi, 0xFF8
		1329	jae .eof
77	diamond	1330	lea eax, [edi+31]
75	diamond	1331	pusha
		1332	call read_chs_sector
		1333	popa
		1334	cmp [FDC_Status], 0
		1335	jnz .err
		1336	sub ebx, 512
		1337	jae .skip
77	diamond	1338	lea eax, [0xD000+ebx+512]
75	diamond	1339	neg ebx
		1340	push ecx
		1341	cmp ecx, ebx
		1342	jbe @f
		1343	mov ecx, ebx
71	diamond	1344	@@:
75	diamond	1345	mov ebx, edx
		1346	call memmove
		1347	add edx, ecx
		1348	sub [esp], ecx
		1349	pop ecx
		1350	xor ebx, ebx
71	diamond	1351	.skip:
75	diamond	1352	movzx edi, word [edi*2+0x282000]
		1353	jmp .new
71	diamond	1354	.done:
77	diamond	1355	mov ebx, edx
		1356	pop eax edx ecx edi
		1357	sub ebx, edx
75	diamond	1358	ret
71	diamond	1359	.eof:
77	diamond	1360	mov ebx, edx
		1361	pop eax edx ecx
75	diamond	1362	jmp .reteof
71	diamond	1363	.err:
77	diamond	1364	mov ebx, edx
		1365	pop eax edx ecx edi
		1366	sub ebx, edx
83	diamond	1367	mov al, 11
75	diamond	1368	ret
		1369
		1370	;----------------------------------------------------------------
		1371	;
		1372	; fs_FloppyReadFolder - LFN variant for reading floppy folders
		1373	;
		1374	; esi points to filename
78	diamond	1375	; ebx pointer to structure: 32-bit number = first wanted block, 0+
		1376	; & flags (bitfields)
		1377	; flags: bit 0: 0=ANSI names, 1=UNICODE names
75	diamond	1378	; ecx number of blocks to read, 0+
		1379	; edx mem location to return data
		1380	;
77	diamond	1381	; ret ebx = blocks read or 0xffffffff folder not found
75	diamond	1382	; eax = 0 ok read or other = errormsg
		1383	;
		1384	;--------------------------------------------------------------
		1385	fs_FloppyReadFolder:
		1386	call read_flp_fat
		1387	push edi
		1388	cmp byte [esi], 0
		1389	jz .root
		1390	call fd_find_lfn
		1391	jnc .found
		1392	pop edi
		1393	or ebx, -1
		1394	mov eax, ERROR_FILE_NOT_FOUND
		1395	ret
		1396	.found:
		1397	test byte [edi+11], 0x10 ; do not allow read files
		1398	jnz .found_dir
		1399	pop edi
		1400	or ebx, -1
		1401	mov eax, ERROR_ACCESS_DENIED
		1402	ret
		1403	.found_dir:
		1404	movzx eax, word [edi+26]
		1405	add eax, 31
		1406	push 0
		1407	jmp .doit
		1408	.root:
		1409	mov eax, 19
		1410	push 14
		1411	.doit:
		1412	push ecx ebp
		1413	sub esp, 262*2 ; reserve space for LFN
		1414	mov ebp, esp
78	diamond	1415	push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE names
		1416	mov ebx, [ebx]
75	diamond	1417	; init header
		1418	push eax ecx
		1419	mov edi, edx
		1420	mov ecx, 32/4
		1421	xor eax, eax
		1422	rep stosd
		1423	pop ecx eax
		1424	mov byte [edx], 1 ; version
		1425	mov esi, edi ; esi points to BDFE
		1426	.main_loop:
		1427	pusha
		1428	call read_chs_sector
		1429	popa
		1430	cmp [FDC_Status], 0
		1431	jnz .error
		1432	mov edi, 0xD000
		1433	push eax
		1434	.l1:
		1435	call fat_get_name
		1436	jc .l2
		1437	cmp byte [edi+11], 0xF
		1438	jnz .do_bdfe
		1439	add edi, 0x20
		1440	cmp edi, 0xD200
		1441	jb .do_bdfe
		1442	pop eax
		1443	inc eax
		1444	dec byte [esp+262*2+12]
		1445	jz .done
		1446	jns @f
		1447	; read next sector from FAT
		1448	mov eax, [(eax-31-1)*2+0x282000]
		1449	and eax, 0xFFF
		1450	cmp eax, 0xFF8
		1451	jae .done
		1452	add eax, 31
		1453	mov byte [esp+262*2+12], 0
		1454	@@:
		1455	pusha
		1456	call read_chs_sector
		1457	popa
		1458	cmp [FDC_Status], 0
		1459	jnz .error
		1460	mov edi, 0xD000
		1461	push eax
		1462	.do_bdfe:
		1463	inc dword [edx+8] ; new file found
		1464	dec ebx
		1465	jns .l2
		1466	dec ecx
		1467	js .l2
		1468	inc dword [edx+4] ; new file block copied
		1469	call fat_entry_to_bdfe
		1470	.l2:
		1471	add edi, 0x20
		1472	cmp edi, 0xD200
		1473	jb .l1
		1474	pop eax
		1475	inc eax
		1476	dec byte [esp+262*2+12]
		1477	jz .done
		1478	jns @f
		1479	; read next sector from FAT
		1480	mov eax, [(eax-31-1)*2+0x282000]
		1481	and eax, 0xFFF
		1482	cmp eax, 0xFF8
		1483	jae .done
		1484	add eax, 31
		1485	mov byte [esp+262*2+12], 0
		1486	@@:
		1487	jmp .main_loop
		1488	.error:
		1489	add esp, 262*2+4
		1490	pop ebp ecx edi edi
		1491	or ebx, -1
		1492	mov eax, ERROR_FILE_NOT_FOUND
		1493	ret
		1494	.done:
		1495	add esp, 262*2+4
		1496	pop ebp
77	diamond	1497	mov ebx, [edx+4]
75	diamond	1498	xor eax, eax
		1499	dec ecx
		1500	js @f
		1501	mov al, ERROR_END_OF_FILE
		1502	@@:
		1503	pop ecx edi edi
		1504	ret
		1505
83	diamond	1506	;----------------------------------------------------------------
		1507	;
		1508	; fs_FloppyRewrite - LFN variant for writing sys floppy
		1509	;
		1510	; esi points to filename
		1511	; ebx ignored (reserved)
		1512	; ecx number of bytes to write, 0+
		1513	; edx mem location to data
		1514	;
		1515	; ret ebx = number of written bytes
		1516	; eax = 0 ok read or other = errormsg
		1517	;
		1518	;--------------------------------------------------------------
		1519	@@:
		1520	mov eax, ERROR_ACCESS_DENIED
		1521	xor ebx, ebx
		1522	ret
		1523	fsfrfe2:
		1524	popad
		1525	fsfrfe:
		1526	mov eax, 11
		1527	xor ebx, ebx
		1528	ret
		1529
		1530	fs_FloppyRewrite:
		1531	cmp byte [esi], 0
		1532	jz @b
		1533	call read_flp_fat
		1534	cmp [FDC_Status], 0
		1535	jnz fsfrfe
		1536	pushad
		1537	xor ebp, ebp
		1538	push esi
		1539	@@:
		1540	lodsb
		1541	test al, al
		1542	jz @f
		1543	cmp al, '/'
		1544	jnz @b
		1545	lea ebp, [esi-1]
		1546	jmp @b
		1547	@@:
		1548	pop esi
		1549	test ebp, ebp
		1550	jnz .noroot
		1551	call read_flp_root
		1552	cmp [FDC_Status], 0
		1553	jnz fsfrfe2
		1554	push flp_rootmem_extend_dir
		1555	push flp_rootmem_end_write
		1556	push flp_rootmem_next_write
		1557	push flp_rootmem_begin_write
		1558	xor ebp, ebp
		1559	push ebp
		1560	push flp_rootmem_first
		1561	push flp_rootmem_next
		1562	jmp .common1
		1563	.noroot:
		1564	; check existence
		1565	mov byte [ebp], 0
		1566	call fd_find_lfn
		1567	mov byte [ebp], '/'
		1568	lea esi, [ebp+1]
		1569	jnc @f
		1570	mov eax, ERROR_FILE_NOT_FOUND
		1571	.ret1:
		1572	mov [esp+28], eax
		1573	popad
		1574	xor ebx, ebx
		1575	ret
		1576	@@:
		1577	test byte [edi+11], 0x10 ; must be directory
		1578	mov eax, ERROR_ACCESS_DENIED
		1579	jz .ret1
		1580	movzx ebp, word [edi+26] ; ebp=cluster
		1581	mov eax, ERROR_FAT_TABLE
		1582	cmp ebp, 2
		1583	jb .ret1
		1584	cmp ebp, 2849
		1585	jae .ret1
		1586	push flp_notroot_extend_dir
		1587	push flp_notroot_end_write
		1588	push flp_notroot_next_write
		1589	push flp_notroot_begin_write
		1590	push ebp
		1591	push flp_notroot_first
		1592	push flp_notroot_next
		1593	.common1:
		1594	call fat_find_lfn
		1595	jc .notfound
		1596	; found, delete FAT chain
		1597	push edi
		1598	xor eax, eax
		1599	mov dword [edi+28], eax ; zero size
		1600	xchg ax, word [edi+26] ; start cluster
		1601	test eax, eax
		1602	jz .done1
		1603	@@:
		1604	cmp eax, 0xFF8
		1605	jae .done1
		1606	lea edi, [0x282000 + eax*2] ; position in FAT
		1607	xor eax, eax
		1608	xchg ax, [edi]
		1609	jmp @b
		1610	.done1:
		1611	pop edi
		1612	call get_time_for_file
		1613	mov [edi+22], ax
		1614	call get_date_for_file
		1615	mov [edi+24], ax
		1616	mov [edi+18], ax
		1617	or byte [edi+11], 20h ; set 'archive' attribute
		1618	jmp .doit
		1619	.notfound:
		1620	; file is not found; generate short name
		1621	call fat_name_is_legal
		1622	jc @f
		1623	add esp, 28
		1624	popad
		1625	mov eax, ERROR_FILE_NOT_FOUND
		1626	xor ebx, ebx
		1627	ret
		1628	@@:
		1629	sub esp, 12
		1630	mov edi, esp
		1631	call fat_gen_short_name
		1632	.test_short_name_loop:
		1633	push esi edi ecx
		1634	mov esi, edi
		1635	lea eax, [esp+12+12+8]
		1636	mov [eax], ebp
		1637	call dword [eax-4]
		1638	jc .found
		1639	.test_short_name_entry:
		1640	cmp byte [edi+11], 0xF
		1641	jz .test_short_name_cont
		1642	mov ecx, 11
		1643	push esi edi
		1644	repz cmpsb
		1645	pop edi esi
		1646	jz .short_name_found
		1647	.test_short_name_cont:
		1648	lea eax, [esp+12+12+8]
		1649	call dword [eax-8]
		1650	jnc .test_short_name_entry
		1651	jmp .found
		1652	.short_name_found:
		1653	pop ecx edi esi
		1654	call fat_next_short_name
		1655	jnc .test_short_name_loop
		1656	.disk_full:
		1657	add esp, 12+28
		1658	popa
		1659	mov eax, ERROR_DISK_FULL
		1660	xor ebx, ebx
		1661	ret
		1662	.found:
		1663	pop ecx edi esi
		1664	; now find space in directory
		1665	; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~'
		1666	mov al, '~'
		1667	push ecx edi
		1668	mov ecx, 8
		1669	repnz scasb
		1670	push 1
		1671	pop eax ; 1 entry
		1672	jnz .notilde
		1673	; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total
		1674	xor eax, eax
		1675	@@:
		1676	cmp byte [esi], 0
		1677	jz @f
		1678	inc esi
		1679	inc eax
		1680	jmp @b
		1681	@@:
		1682	sub esi, eax
		1683	add eax, 12+13
		1684	mov ecx, 13
		1685	push edx
		1686	cdq
		1687	div ecx
		1688	pop edx
		1689	.notilde:
		1690	push -1
		1691	push -1
		1692	; find successive entries in directory
		1693	xor ecx, ecx
		1694	push eax
		1695	lea eax, [esp+12+8+12+8]
		1696	mov [eax], ebp
		1697	call dword [eax-4]
		1698	pop eax
		1699	jnc .scan_dir
		1700	.fsfrfe3:
		1701	add esp, 8+8+12+28
		1702	popad
		1703	mov eax, 11
		1704	xor ebx, ebx
		1705	ret
		1706	.scan_dir:
		1707	cmp byte [edi], 0
		1708	jz .free
		1709	cmp byte [edi], 0xE5
		1710	jz .free
		1711	xor ecx, ecx
		1712	.scan_cont:
		1713	push eax
		1714	lea eax, [esp+12+8+12+8]
		1715	call dword [eax-8]
		1716	pop eax
		1717	jnc .scan_dir
		1718	cmp [FDC_Status], 0
		1719	jnz .fsfrfe3
		1720	push eax
		1721	lea eax, [esp+12+8+12+8]
		1722	call dword [eax+16] ; extend directory
		1723	pop eax
		1724	jnc .scan_dir
		1725	add esp, 8+8+12+28
		1726	popad
		1727	mov eax, ERROR_DISK_FULL
		1728	xor ebx, ebx
		1729	ret
		1730	.free:
		1731	test ecx, ecx
		1732	jnz @f
		1733	mov [esp], edi
		1734	mov ecx, [esp+8+8+12+8]
		1735	mov [esp+4], ecx
		1736	xor ecx, ecx
		1737	@@:
		1738	inc ecx
		1739	cmp ecx, eax
		1740	jb .scan_cont
		1741	; found!
		1742	; calculate name checksum
		1743	push esi ecx
		1744	mov esi, [esp+8+8]
		1745	mov ecx, 11
		1746	xor eax, eax
		1747	@@:
		1748	ror al, 1
		1749	add al, [esi]
		1750	inc esi
		1751	loop @b
		1752	pop ecx esi
		1753	pop edi
		1754	pop dword [esp+8+12+8]
		1755	; edi points to first entry in free chunk
		1756	dec ecx
		1757	jz .nolfn
		1758	push esi
		1759	push eax
		1760	lea eax, [esp+8+8+12+8]
		1761	call dword [eax+4] ; begin write
		1762	mov al, 40h
		1763	.writelfn:
		1764	or al, cl
		1765	mov esi, [esp+4]
		1766	push ecx
		1767	dec ecx
		1768	imul ecx, 13
		1769	add esi, ecx
		1770	stosb
		1771	mov cl, 5
		1772	call fs_RamdiskRewrite.read_symbols
		1773	mov ax, 0xF
		1774	stosw
		1775	mov al, [esp+4]
		1776	stosb
		1777	mov cl, 6
		1778	call fs_RamdiskRewrite.read_symbols
		1779	xor eax, eax
		1780	stosw
		1781	mov cl, 2
		1782	call fs_RamdiskRewrite.read_symbols
		1783	pop ecx
		1784	lea eax, [esp+8+8+12+8]
		1785	call dword [eax+8] ; next write
		1786	xor eax, eax
		1787	loop .writelfn
		1788	pop eax
		1789	pop esi
		1790	; lea eax, [esp+8+12+8]
		1791	; call dword [eax+12] ; end write
		1792	.nolfn:
		1793	xchg esi, [esp]
		1794	mov ecx, 11
		1795	rep movsb
		1796	mov word [edi], 20h ; attributes
		1797	sub edi, 11
		1798	pop esi ecx
		1799	add esp, 12
		1800	mov byte [edi+13], 0 ; tenths of a second at file creation time
		1801	call get_time_for_file
		1802	mov [edi+14], ax ; creation time
		1803	mov [edi+22], ax ; last write time
		1804	call get_date_for_file
		1805	mov [edi+16], ax ; creation date
		1806	mov [edi+24], ax ; last write date
		1807	mov [edi+18], ax ; last access date
		1808	and word [edi+20], 0 ; high word of cluster
		1809	and word [edi+26], 0 ; low word of cluster - to be filled
		1810	and dword [edi+28], 0 ; file size - to be filled
		1811	.doit:
		1812	lea eax, [esp+8]
		1813	call dword [eax+12] ; flush directory
		1814	push ecx
		1815	push edi
		1816	add edi, 26 ; edi points to low word of cluster
		1817	push edi
		1818	mov esi, edx
		1819	jecxz .done
		1820	mov ecx, 2849
		1821	mov edi, 0x282000
		1822	push 0 ; first cluster
		1823	.write_loop:
		1824	; allocate new cluster
		1825	xor eax, eax
		1826	repnz scasw
		1827	mov al, ERROR_DISK_FULL
		1828	jnz .ret
		1829	dec edi
		1830	dec edi
		1831	lea eax, [edi-0x282000]
		1832	shr eax, 1 ; eax = cluster
		1833	mov word [edi], 0xFFF ; mark as last cluster
		1834	cmp dword [esp], 0
		1835	jz .first
		1836	xchg edi, [esp+4]
		1837	stosw
		1838	mov edi, [esp+4]
		1839	jmp @f
		1840	.first:
		1841	mov [esp], eax
		1842	@@:
		1843	inc ecx
		1844	; write data
		1845	push ecx edi
		1846	mov ecx, 512
		1847	cmp dword [esp+20], ecx
		1848	jae @f
		1849	mov ecx, [esp+20]
		1850	@@:
		1851	push ecx
		1852	mov edi, 0xD000
		1853	rep movsb
		1854	pop ecx
		1855	push ecx
		1856	sub ecx, 512
		1857	neg ecx
		1858	push eax
		1859	xor eax, eax
		1860	rep stosb
		1861	pop eax
		1862	add eax, 31
		1863	pusha
		1864	call save_chs_sector
		1865	popa
		1866	pop ecx
		1867	cmp [FDC_Status], 0
		1868	jnz .diskerr
		1869	sub [esp+20], ecx
		1870	pop edi ecx
		1871	jnz .write_loop
		1872	.done:
		1873	xor eax, eax
		1874	.ret:
		1875	pop ebx edi edi ecx
		1876	mov [esp+28+28], eax
		1877	lea eax, [esp+8]
		1878	call dword [eax+4]
		1879	mov [edi+26], bx
		1880	mov ebx, esi
		1881	sub ebx, edx
		1882	mov [edi+28], ebx
		1883	call dword [eax+12]
		1884	mov [esp+28+16], ebx
		1885	test ebp, ebp
		1886	jnz @f
		1887	call save_flp_root
		1888	@@:
		1889	add esp, 28
		1890	cmp [FDC_Status], 0
		1891	jnz .err3
		1892	call save_flp_fat
		1893	cmp [FDC_Status], 0
		1894	jnz .err3
		1895	popa
		1896	ret
		1897	.err3:
		1898	popa
		1899	mov al, 11
		1900	xor ebx, ebx
		1901	ret
		1902	.diskerr:
		1903	sub esi, ecx
		1904	mov eax, 11
		1905	pop edi ecx
		1906	jmp .ret
		1907
78	diamond	1908	; \end{diamond}

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(root)/kernel/trunk/fs/fat12.inc – Rev 83