;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; FAT12.INC ;; ;; (C) 2005 Mario79, License: GPL ;; ;; ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; n_sector dd 0 ; temporary save for sector value flp_status dd 0 clust_tmp_flp dd 0 ; used by analyze_directory and analyze_directory_to_write path_pointer_flp dd 0 pointer_file_name_flp dd 0 save_root_flag db 0 save_flag db 0 root_read db 0 ; 0-necessary to load root, 1-not to load root flp_fat db 0 ; 0-necessary to load fat, 1-not to load fat flp_number db 0 ; 1- Floppy A, 2-Floppy B old_track db 0 ; old value track flp_label rb 15 ; Label and ID of inserted floppy disk reserve_flp: cli cmp [flp_status],0 je reserve_flp_ok sti call change_task jmp reserve_flp reserve_flp_ok: push eax mov eax,[CURRENT_TASK] shl eax,5 mov eax,[eax+CURRENT_TASK+TASKDATA.pid] mov [flp_status],eax pop eax sti ret floppy_free_space: ;--------------------------------------------- ; ; returns free space in edi ; ;--------------------------------------------- push eax ebx ecx call read_flp_fat cmp [FDC_Status],0 jne fdc_status_error_2 mov eax,0x282004 xor edi,edi mov ecx,2847 ;1448000/512 rdfs1_1: mov ebx,[eax] and ebx,4095 jne rdfs2_1 add edi,512 rdfs2_1: add eax,2 loop rdfs1_1 fdc_status_error_2: pop ecx ebx eax ret floppy_fileread: ;---------------------------------------------------------------- ; ; fileread - sys floppy ; ; eax points to filename 11 chars - for root directory ; ebx first wanted block ; 1+ ; if 0 then set to 1 ; ecx number of blocks to read ; 1+ ; if 0 then set to 1 ; edx mem location to return data ; esi length of filename 12*X ; edi pointer to path /fd/1/...... - for all files in nested directories ; ; ret ebx = size or 0xffffffff file not found ; eax = 0 ok read or other = errormsg ; 10 = access denied ;-------------------------------------------------------------- mov [save_flag],0 mov [path_pointer_flp],edi cmp esi,0 ; return ramdisk root jne fr_noroot_1 cmp ebx,224/16 jbe fr_do_1 mov eax,5 mov ebx,0 mov [flp_status],0 ret fr_do_1: push ebx ecx edx call read_flp_root pop edx ecx ebx cmp [FDC_Status],0 jne fdc_status_error_1 mov edi,edx dec ebx shl ebx,9 mov esi,FLOPPY_BUFF add esi,ebx shl ecx,9 cld rep movsb mov eax,0 ; ok read mov ebx,0 mov [flp_status],0 ret fdc_status_error_1: mov [flp_status],0 mov eax,10 mov ebx,-1 ret fr_noroot_1: sub esp,32 call expand_filename frfloppy_1: cmp ebx,0 jne frfl5_1 mov ebx,1 frfl5_1: cmp ecx,0 jne frfl6_1 mov ecx,1 frfl6_1: dec ebx push eax push eax ebx ecx edx esi edi call read_flp_fat cmp [FDC_Status],0 jne fdc_status_error_3_1 mov [FDD_Track],0 ; Цилиндр mov [FDD_Head],1 ; Сторона mov [FDD_Sector],2 ; Сектор call SeekTrack mov dh,14 l.20_1: call ReadSectWithRetr cmp [FDC_Status],0 jne fdc_status_error_3_1 mov dl,16 mov edi,FDD_BUFF inc [FDD_Sector] l.21_1: mov esi,eax ;Name of file we want mov ecx,11 cld rep cmpsb ;Found the file? je fifound_1 ;Yes add ecx,21 add edi, ecx ;Advance to next entry dec dl cmp dl,0 jne l.21_1 dec dh cmp dh,0 jne l.20_1 fdc_status_error_3: mov eax,5 ; file not found ? mov ebx,-1 add esp,32+28 mov [flp_status],0 ret fdc_status_error_3_2: cmp [FDC_Status],0 je fdc_status_error_3 fdc_status_error_3_1: add esp,32+28 jmp fdc_status_error_1 fifound_1: mov eax,[path_pointer_flp] cmp [eax+36],byte 0 je fifound_2 add edi,0xf mov eax,[edi] and eax,65535 mov ebx,[path_pointer_flp] add ebx,36 call get_cluster_of_a_path_flp jc fdc_status_error_3_2 mov ebx,[ebx-11+28] ;file size mov [esp+20],ebx mov [esp+24],ebx jmp fifound_3 fifound_2: mov ebx,[edi-11+28] ;file size mov [esp+20],ebx mov [esp+24],ebx add edi,0xf mov eax,[edi] fifound_3: and eax,65535 mov [n_sector],eax ;eax=cluster frnew_1: add eax,31 ;bootsector+2*fat+filenames cmp [esp+16],dword 0 ; wanted cluster ? jne frfl7_1 call read_chs_sector cmp [FDC_Status],0 jne fdc_status_error_5 mov edi,[esp+8] call give_back_application_data_1 add [esp+8],dword 512 dec dword [esp+12] ; last wanted cluster ? cmp [esp+12],dword 0 je frnoread_1 jmp frfl8_1 frfl7_1: dec dword [esp+16] frfl8_1: mov edi,[n_sector] shl edi,1 ;find next cluster from FAT add edi,0x282000 mov eax,[edi] and eax,4095 mov edi,eax mov [n_sector],edi cmp edi,4095 ;eof - cluster jz frnoread2_1 cmp [esp+24],dword 512 ;eof - size jb frnoread_1 sub [esp+24],dword 512 jmp frnew_1 read_chs_sector: call calculate_chs call ReadSectWithRetr ret frnoread2_1: cmp [esp+16],dword 0 ; eof without read ? je frnoread_1 mov [fdc_irq_func],fdc_null pop edi esi edx ecx add esp,4 pop ebx ; ebx <- eax : size of file add esp,36 mov eax,6 ; end of file mov [flp_status],0 ret frnoread_1: pop edi esi edx ecx add esp,4 pop ebx ; ebx <- eax : size of file add esp,36 mov eax,0 mov [flp_status],0 ret fdc_status_error_5: pop edi esi edx ecx add esp,4 pop ebx ; ebx <- eax : size of file add esp,36 jmp fdc_status_error_1 read_flp_root: pusha call check_label cmp [FDC_Status],0 jne unnecessary_root_read cmp [root_read],1 je unnecessary_root_read mov [FDD_Track],0 ; Цилиндр mov [FDD_Head],1 ; Сторона mov [FDD_Sector],2 ; Сектор mov edi,FLOPPY_BUFF call SeekTrack read_flp_root_1: call ReadSectWithRetr cmp [FDC_Status],0 jne unnecessary_root_read push edi call give_back_application_data_1 pop edi add edi,512 inc [FDD_Sector] cmp [FDD_Sector],16 jne read_flp_root_1 mov [root_read],1 unnecessary_root_read: popa ret read_flp_fat: pusha call check_label cmp [FDC_Status],0 jne unnecessary_flp_fat cmp [flp_fat],1 je unnecessary_flp_fat mov [FDD_Track],0 ; Цилиндр mov [FDD_Head],0 ; Сторона mov [FDD_Sector],2 ; Сектор mov edi,FLOPPY_BUFF call SeekTrack read_flp_fat_1: call ReadSectWithRetr cmp [FDC_Status],0 jne unnecessary_flp_fat push edi call give_back_application_data_1 pop edi add edi,512 inc [FDD_Sector] cmp [FDD_Sector],19 jne read_flp_fat_1 mov [FDD_Sector],1 mov [FDD_Head],1 call ReadSectWithRetr cmp [FDC_Status],0 jne unnecessary_flp_fat call give_back_application_data_1 call calculatefatchain_flp mov [root_read],0 mov [flp_fat],1 unnecessary_flp_fat: popa ret calculatefatchain_flp: pushad mov esi,FLOPPY_BUFF mov edi,0x282000 fcnew_1: mov eax,dword [esi] mov ebx,dword [esi+4] mov ecx,dword [esi+8] mov edx,ecx shr edx,4 ;8 ok shr dx,4 ;7 ok xor ch,ch shld ecx,ebx,20 ;6 ok shr cx,4 ;5 ok shld ebx,eax,12 and ebx,0x0fffffff ;4 ok shr bx,4 ;3 ok shl eax,4 and eax,0x0fffffff ;2 ok shr ax,4 ;1 ok mov dword [edi],eax add edi,4 mov dword [edi],ebx add edi,4 mov dword [edi],ecx add edi,4 mov dword [edi],edx add edi,4 add esi,12 cmp edi,0x282000+2856*2 ;2849 clusters jnz fcnew_1 popad ret check_label: pushad mov [FDD_Track],0 ; Цилиндр mov [FDD_Head],0 ; Сторона mov [FDD_Sector],1 ; Сектор call SetUserInterrupts call FDDMotorON call RecalibrateFDD cmp [FDC_Status],0 jne fdc_status_error call SeekTrack cmp [FDC_Status],0 jne fdc_status_error call ReadSectWithRetr cmp [FDC_Status],0 jne fdc_status_error mov esi,flp_label mov edi,FDD_BUFF+39 mov ecx,15 cld rep cmpsb je same_label mov [root_read],0 mov [flp_fat],0 same_label: mov esi,FDD_BUFF+39 mov edi,flp_label mov ecx,15 cld rep movsb popad ret fdc_status_error: popad ret save_flp_root: pusha call check_label cmp [FDC_Status],0 jne unnecessary_root_save cmp [root_read],0 je unnecessary_root_save mov [FDD_Track],0 ; Цилиндр mov [FDD_Head],1 ; Сторона mov [FDD_Sector],2 ; Сектор mov esi,FLOPPY_BUFF call SeekTrack save_flp_root_1: push esi call take_data_from_application_1 pop esi add esi,512 call WriteSectWithRetr cmp [FDC_Status],0 jne unnecessary_root_save inc [FDD_Sector] cmp [FDD_Sector],16 jne save_flp_root_1 unnecessary_root_save: mov [fdc_irq_func],fdc_null popa ret save_flp_fat: pusha call check_label cmp [FDC_Status],0 jne unnecessary_flp_fat_save cmp [flp_fat],0 je unnecessary_flp_fat_save call restorefatchain_flp mov [FDD_Track],0 ; Цилиндр mov [FDD_Head],0 ; Сторона mov [FDD_Sector],2 ; Сектор mov esi,FLOPPY_BUFF call SeekTrack save_flp_fat_1: push esi call take_data_from_application_1 pop esi add esi,512 call WriteSectWithRetr cmp [FDC_Status],0 jne unnecessary_flp_fat_save inc [FDD_Sector] cmp [FDD_Sector],19 jne save_flp_fat_1 mov [FDD_Sector],1 mov [FDD_Head],1 call take_data_from_application_1 call WriteSectWithRetr cmp [FDC_Status],0 jne unnecessary_flp_fat_save mov [root_read],0 unnecessary_flp_fat_save: mov [fdc_irq_func],fdc_null popa ret restorefatchain_flp: ; restore fat chain pushad mov esi,0x282000 mov edi,FLOPPY_BUFF fcnew2_1: mov eax,dword [esi] mov ebx,dword [esi+4] shl ax,4 shl eax,4 shl bx,4 shr ebx,4 shrd eax,ebx,8 shr ebx,8 mov dword [edi],eax add edi,4 mov word [edi],bx add edi,2 add esi,8 cmp edi,FLOPPY_BUFF+0x1200 ;4274 bytes - all used FAT jb fcnew2_1 mov esi,FLOPPY_BUFF ; duplicate fat chain mov edi,FLOPPY_BUFF+0x1200 mov ecx,0x1200/4 cld rep movsd popad ret floppy_filedelete: ;-------------------------------------------- ; ; filedelete - sys floppy ; in: ; eax - filename 11 chars - for root directory ; edi pointer to path /fd/1/...... - for all files in nested directories ; ; out: ; eax - 0 = successful, 1 = file not found, 10 = access denied ; ;-------------------------------------------- mov [path_pointer_flp],edi mov [save_flag],0 mov ebp,1 ; file not found as default filedelete_newtry_1: sub esp,32 call expand_filename push eax ebx ecx edx esi edi call read_flp_fat cmp [FDC_Status],0 jne frnoreadd_1 mov [FDD_Track],0 ; Цилиндр mov [FDD_Head],1 ; Сторона mov [FDD_Sector],2 ; Сектор call SeekTrack mov dh,14 l.20_2: call ReadSectWithRetr cmp [FDC_Status],0 jne fdc_status_error_4 mov dl,16 mov edi,FDD_BUFF inc [FDD_Sector] l.21_2: mov esi,eax ;Name of file we want mov ecx,11 cld rep cmpsb ;Found the file? je fifoundd_1 ;Yes add ecx,21 add edi, ecx ;Advance to next entry dec dl jne l.21_2 dec dh jne l.20_2 jmp frnoreadd_1 fdc_status_error_4: pop edi esi edx ecx ebx eax add esp,32 jmp fdc_status_error_1 fifoundd_1: mov eax,[path_pointer_flp] cmp [eax+36],byte 0 je fifoundd_2 movzx eax, word [edi+0xf] mov ebx,[path_pointer_flp] add ebx,36 call get_cluster_of_a_path_flp jc frnoreadd_1_1 mov edi,ebx add edi,11 jmp fifoundd_2_1 fifoundd_2: dec [FDD_Sector] fifoundd_2_1: mov [edi-11],byte 0xE5 ;mark filename deleted movzx edi, word [edi+0xf] ;edi = cluster frnewd_1: shl edi,1 ;find next cluster from FAT add edi,0x282000 mov eax,[edi] mov [edi],word 0x0 ;clear fat chain cluster and eax,4095 mov edi,eax cmp edi,dword 4095 ;last cluster ? jz frnoreadd2_1 jmp frnewd_1 frnoreadd2_1: call WriteSectWithRetr cmp [FDC_Status],0 jne fdc_status_error_4 call save_flp_fat cmp [FDC_Status],0 jne fdc_status_error_4 ; pop edi esi edx ecx ebx eax ; add esp,32 mov ebp,0 ; file found ; jmp filedelete_newtry_1 jmp frnoreadd_1 frnoreadd_1_1: cmp [FDC_Status],0 jne fdc_status_error_4 frnoreadd_1: pop edi esi edx ecx ebx eax add esp,32 mov eax,ebp ret floppy_filesave: ;---------------------------------------------------------- ; ; filesave - sys floppy ; ; eax ; pointer to file name 11 chars - for root directory ; ebx ; buffer ; ecx ; count to write in bytes ; edx ; 0 create new , 1 append ; edi pointer to path /fd/1/...... - for all files in nested directories ; ; output : eax = 0 - ok ; 5 - file not found / directory not found ; 8 - disk full ; 10 - access denied ;----------------------------------------------------------- mov [path_pointer_flp],edi sub esp,32 call expand_filename cmp edx,0 jnz fsdel_1 pusha call floppy_filedelete cmp [FDC_Status],0 jne fdc_status_error_6 popa mov [save_flag],1 fsdel_1: call floppy_free_space cmp [FDC_Status],0 jne fdc_status_error_6 cmp ecx,edi jb rd_do_save_1 add esp,32 mov eax,8 ; not enough free space mov [flp_status],0 ret fdc_status_error_6: popa add esp,32 jmp fdc_status_error_1 rd_do_save_1: push eax ebx ecx edx esi edi call read_flp_fat cmp [FDC_Status],0 jne fdc_status_error_7 push eax mov eax,[path_pointer_flp] cmp [eax+36],byte 0 jne fifoundds_2 pop eax mov [save_root_flag],1 call read_flp_root cmp [FDC_Status],0 jne fdc_status_error_7 mov edi,FLOPPY_BUFF ;Point at directory mov edx,224 +1 ; find an empty spot for filename in the root dir l20ds_1: sub edx,1 jz frnoreadds_1 l21ds_1: cmp [edi],byte 0xE5 jz fifoundds_1 cmp [edi],byte 0x0 jz fifoundds_1 add edi,32 ; Advance to next entry jmp l20ds_1 fifoundds_2: pop eax mov [save_root_flag],0 mov [FDD_Track],0 ; Цилиндр mov [FDD_Head],1 ; Сторона mov [FDD_Sector],2 ; Сектор call SeekTrack mov dh,14 l.20_3: call ReadSectWithRetr cmp [FDC_Status],0 jne fdc_status_error_7 mov dl,16 mov edi,FDD_BUFF inc [FDD_Sector] l.21_3: mov esi,eax ;Name of file we want mov ecx,11 cld rep cmpsb ;Found the file? je fifoundds_3 ;Yes add ecx,21 add edi, ecx ;Advance to next entry dec dl jne l.21_3 dec dh jne l.20_3 fdc_status_error_8: pop edi esi edx ecx ebx eax mov eax,5 ; file not found ? mov ebx,-1 add esp,32 mov [flp_status],0 ret fifoundds_3: add edi,0xf mov eax,[edi] and eax,65535 mov ebx,[path_pointer_flp] add ebx,36 call get_cluster_of_a_path_flp jc fdc_status_error_7_1 found_directory_for_writing_flp: call analyze_directory_to_write_flp jc fdc_status_error_7_1 mov edi,ebx fifoundds_1: push edi ; move the filename to root dir mov esi,[esp+4+20] cmp [save_root_flag],0 jne fifoundds_4 mov esi,[pointer_file_name_flp] fifoundds_4: mov ecx,11 cld rep movsb pop edi mov edx,edi add edx,11+0xf ; edx <- cluster save position mov ebx,[esp+12] ; save file size mov [edi+28],ebx mov [edi+11],byte 0x20 ; attribute call get_date_for_file ; from FAT32.INC mov [edi+24],ax ; date mov [edi+18],ax ; date call get_time_for_file ; from FAT32.INC mov [edi+22],ax ; time xor ax,ax mov [edi+20],ax mov ebx,1 ; first cluster cmp [save_root_flag],0 jne frnewds_1 call frnewds_2 pusha call WriteSectWithRetr popa cmp [FDC_Status],0 jne fdc_status_error_7 jmp frnewds_3 frnewds_1: call frnewds_2 frnewds_3: pusha ; move save to floppy cluster add ebx,31 mov eax,ebx mov esi,[esp+32+16] call take_data_from_application_1 call save_chs_sector cmp [FDC_Status],0 jne fdc_status_error_7 popa mov eax,[esp+12] cmp eax,512 jb flnsa_1 sub eax,512 mov [esp+12],eax mov eax,[esp+16] add eax,512 mov [esp+16],eax jmp frnewds_1 frnewds_2: add ebx,1 mov edi,ebx ; find free cluster in FAT shl edi,1 add edi,0x282000 mov eax,[edi] and eax,4095 jnz frnewds_2 mov [edx],bx ; save next cluster pos. to prev cl. mov edx,edi ; next save pos abs mem add ret flnsa_1: mov [edi],word 4095 ; mark end of file - last cluster cmp [save_root_flag],1 jne flnsa_2 call save_flp_root cmp [FDC_Status],0 jne fdc_status_error_7 flnsa_2: call save_flp_fat cmp [FDC_Status],0 jne fdc_status_error_7 frnoreadds_1: pop edi esi edx ecx ebx eax add esp,32 mov eax,0 mov [flp_status],0 ret fdc_status_error_7_1: cmp [FDC_Status],0 je fdc_status_error_8 fdc_status_error_7: pop edi esi edx ecx ebx eax add esp,32 jmp fdc_status_error_1 save_chs_sector: call calculate_chs call WriteSectWithRetr ret calculate_chs: mov bl,[FDD_Track] mov [old_track],bl mov ebx,18 xor edx,edx div ebx inc edx mov [FDD_Sector],dl xor edx,edx mov ebx,2 div ebx mov [FDD_Track],al mov [FDD_Head],0 cmp edx,0 je no_head_2 inc [FDD_Head] no_head_2: mov dl,[old_track] cmp dl,[FDD_Track] je no_seek_track_1 call SeekTrack no_seek_track_1: ret get_cluster_of_a_path_flp: ;--------------------------------------------------------- ; input : EBX = pointer to a path string ; (example: the path "/files/data/document" become ; "files......data.......document...0" ; '.' = space char ; '0' = char(0) (ASCII=0) !!! ) ; output : if (CARRY=1) -> ERROR in the PATH ; if (CARRY=0) -> EAX=cluster ;--------------------------------------------------------- push edx mov edx,ebx search_end_of_path_flp: cmp [save_flag],0 jne search_end_of_path_flp_1 cmp byte [edx],0 je found_end_of_path_flp jmp search_end_of_path_flp_2 search_end_of_path_flp_1: cmp byte [edx+12],0 je found_end_of_path_flp search_end_of_path_flp_2: inc edx ; '/' call analyze_directory_flp jc directory_not_found_flp mov eax,[ebx+20-2] ; read the HIGH 16bit cluster field mov ax,[ebx+26] ; read the LOW 16bit cluster field and eax,0xfff ;[fatMASK] add edx,11 ; 8+3 (name+extension) jmp search_end_of_path_flp found_end_of_path_flp: inc edx mov [pointer_file_name_flp],edx pop edx clc ; no errors ret directory_not_found_flp: pop edx stc ; errors occour ret analyze_directory_flp: ;-------------------------------- ; input : EAX = first cluster of the directory ; EBX = pointer to filename ; output : IF CARRY=0 EAX = sector where th file is found ; EBX = pointer in buffer ; [buffer .. buffer+511] ; ECX,EDX,EDI,EDI not changed ; IF CARRY=1 ;-------------------------------- push ebx ;[esp+16] push ecx push edx push esi push edi adr56_flp: mov [clust_tmp_flp],eax add eax,31 pusha call read_chs_sector popa cmp [FDC_Status],0 jne not_found_file_analyze_flp mov ecx,512/32 mov ebx,FDD_BUFF adr1_analyze_flp: mov esi,edx ;[esp+16] mov edi,ebx cld push ecx mov ecx,11 rep cmpsb pop ecx je found_file_analyze_flp add ebx,32 loop adr1_analyze_flp mov eax,[clust_tmp_flp] shl eax,1 ;find next cluster from FAT add eax,0x282000 mov eax,[eax] and eax,4095 cmp eax,0x0ff8 jb adr56_flp not_found_file_analyze_flp: pop edi pop esi pop edx pop ecx add esp,4 stc ;file not found ret found_file_analyze_flp: pop edi pop esi pop edx pop ecx add esp,4 clc ;file found ret analyze_directory_to_write_flp: ;-------------------------------- ; input : EAX = first cluster of the directory ; output : IF CARRY=0 EAX = sector where the file is found ; EBX = pointer in buffer ; [buffer .. buffer+511] ; ECX,EDX,EDI,EDI not changed ; IF CARRY=1 ;-------------------------------- push ecx push edx push esi adr561: mov [clust_tmp_flp],eax add eax,31 pusha call read_chs_sector popa cmp [FDC_Status],0 jne error_found_file_analyze1 mov ecx,512/32 mov ebx,FDD_BUFF adr1_analyze1: cmp byte [ebx],0x00 je found_file_analyze1 cmp byte [ebx],0xe5 je found_file_analyze1 avanti: add ebx,32 loop adr1_analyze1 mov eax,[clust_tmp_flp] shl eax,1 ;find next cluster from FAT add eax,0x282000 mov eax,[eax] and eax,4095 cmp eax,0x0ff8 jb adr561 call get_free_FAT ;this block of code add a new cluster ;for the directory because the directory ;is full mov [edi],word 0x0fff mov eax,[clust_tmp_flp] shl eax,1 ;find next cluster from FAT add eax,0x282000 sub edi,0x282000 mov [eax],di pusha mov ecx,512/4 xor eax,eax mov edi,FDD_BUFF cld rep stosd popa mov eax,edi add eax,31 pusha call save_chs_sector popa cmp [FDC_Status],0 jne error_found_file_analyze1 mov ebx,FDD_BUFF found_file_analyze1: pop esi pop edx pop ecx clc ;file found ret error_found_file_analyze1: pop esi pop edx pop ecx stc ret get_free_FAT_flp: ;------------------------------------------ ; input : EAX = # cluster for start the searching ; output : EAX = # first cluster found free ;------------------------------------------- push ebx mov ebx,1 check_new_flp: add ebx,1 mov edi,ebx ; find free cluster in FAT shl edi,1 add edi,0x282000 mov eax,[edi] and eax,4095 cmp eax,0x0 jnz check_new_flp pop ebx ret ; \begin{diamond} fat_find_lfn: ; in: esi->name ; [esp+4] = next ; [esp+8] = first ; [esp+C]... - possibly parameters for first and next ; out: CF=1 - file not found ; else CF=0, esi->next name component, edi->direntry pusha lea eax, [esp+0Ch+20h] call dword [eax-4] jc .reterr sub esp, 262*2 ; reserve place for LFN mov ebp, esp push 0 ; for fat_get_name: read ASCII name .l1: call fat_get_name jc .l2 call fat_compare_name jz .found .l2: lea eax, [esp+0Ch+20h+262*2+4] call dword [eax-8] jnc .l1 add esp, 262*2+4 .reterr: stc popa ret .found: add esp, 262*2+4 ; if this is LFN entry, advance to true entry cmp byte [edi+11], 0xF jnz @f lea eax, [esp+0Ch+20h] call dword [eax-8] jc .reterr @@: add esp, 8 ; CF=0 push esi push edi popa ret uglobal ; this is for delete support fd_prev_sector dd ? fd_prev_prev_sector dd ? endg flp_root_next: cmp edi, 0xD200-0x20 jae @f add edi, 0x20 ret ; CF=0 @@: ; read next sector inc dword [eax] cmp dword [eax], 14 jae flp_root_first.readerr push [fd_prev_sector] pop [fd_prev_prev_sector] push eax mov eax, [eax] add eax, 19-1 mov [fd_prev_sector], eax pop eax flp_root_first: mov eax, [eax] pusha add eax, 19 call read_chs_sector popa cmp [FDC_Status], 0 jnz .readerr mov edi, FDD_BUFF ret ; CF=0 .readerr: stc ret flp_rootmem_first: mov edi, FLOPPY_BUFF clc ret flp_rootmem_next: add edi, 0x20 cmp edi, FLOPPY_BUFF+14*0x200 cmc flp_rootmem_next_write: flp_rootmem_begin_write: flp_rootmem_end_write: ret flp_rootmem_extend_dir: stc ret flp_notroot_next: cmp edi, 0xD200-0x20 jae flp_notroot_next_sector add edi, 0x20 ret ; CF=0 flp_notroot_next_sector: push ecx mov ecx, [eax] push [fd_prev_sector] pop [fd_prev_prev_sector] add ecx, 31 mov [fd_prev_sector], ecx mov ecx, [(ecx-31)*2+0x282000] and ecx, 0xFFF cmp ecx, 2849 jae flp_notroot_first.err2 mov [eax], ecx pop ecx flp_notroot_first: mov eax, [eax] cmp eax, 2 jb .err cmp eax, 2849 jae .err pusha add eax, 31 call read_chs_sector popa mov edi, FDD_BUFF cmp [FDC_Status], 0 jnz .err ret ; CF=0 .err2: pop ecx .err: stc ret flp_notroot_begin_write: pusha mov eax, [eax] add eax, 31 call read_chs_sector popa ret flp_notroot_end_write: pusha mov eax, [eax] add eax, 31 call save_chs_sector popa ret flp_notroot_next_write: cmp edi, 0xD200 jae @f ret @@: call flp_notroot_end_write jmp flp_notroot_next_sector flp_notroot_extend_dir: ; find free cluster in FAT pusha xor eax, eax mov edi, 0x282000 mov ecx, 2849 repnz scasw jnz .notfound mov word [edi-2], 0xFFF ; mark as last cluster sub edi, 0x282000 shr edi, 1 dec edi mov eax, [esp+28] mov ecx, [eax] mov [0x282000+ecx*2], di mov [eax], edi xor eax, eax mov edi, FDD_BUFF mov ecx, 128 rep stosd popa call flp_notroot_end_write mov edi, FDD_BUFF clc ret .notfound: popa stc ret fd_find_lfn: ; in: esi->name ; out: CF=1 - file not found ; else CF=0 and edi->direntry, eax=directory cluster (0 for root) push esi edi push 0 push flp_root_first push flp_root_next .loop: call fat_find_lfn jc .notfound cmp byte [esi], 0 jz .found test byte [edi+11], 10h jz .notfound movzx eax, word [edi+26] ; cluster mov [esp+8], eax mov dword [esp+4], flp_notroot_first mov dword [esp], flp_notroot_next jmp .loop .notfound: add esp, 12 pop edi esi stc ret .found: mov eax, [esp+8] add eax, 31 cmp dword [esp], flp_root_next jnz @f add eax, -31+19 @@: add esp, 16 ; CF=0 pop esi ret ;---------------------------------------------------------------- ; ; fs_FloppyRead - LFN variant for reading floppy ; ; esi points to filename ; ebx pointer to 64-bit number = first wanted byte, 0+ ; may be ebx=0 - start from first byte ; ecx number of bytes to read, 0+ ; edx mem location to return data ; ; ret ebx = bytes read or 0xffffffff file not found ; eax = 0 ok read or other = errormsg ; ;-------------------------------------------------------------- fs_FloppyRead: call read_flp_fat cmp byte [esi], 0 jnz @f or ebx, -1 mov eax, 10 ; access denied ret @@: push edi call fd_find_lfn jnc .found pop edi or ebx, -1 mov eax, 5 ; file not found ret .found: test ebx, ebx jz .l1 cmp dword [ebx+4], 0 jz @f xor ebx, ebx .reteof: mov eax, 6 ; EOF pop edi ret @@: mov ebx, [ebx] .l1: push ecx edx push 0 mov eax, [edi+28] sub eax, ebx jb .eof cmp eax, ecx jae @f mov ecx, eax mov byte [esp], 6 ; EOF @@: movzx edi, word [edi+26] .new: jecxz .done test edi, edi jz .eof cmp edi, 0xFF8 jae .eof sub ebx, 512 jae .skip lea eax, [edi+31] pusha call read_chs_sector popa cmp [FDC_Status], 0 jnz .err lea eax, [FDD_BUFF+ebx+512] neg ebx push ecx cmp ecx, ebx jbe @f mov ecx, ebx @@: mov ebx, edx call memmove add edx, ecx sub [esp], ecx pop ecx xor ebx, ebx .skip: movzx edi, word [edi*2+0x282000] jmp .new .done: mov ebx, edx pop eax edx ecx edi sub ebx, edx ret .eof: mov ebx, edx pop eax edx ecx jmp .reteof .err: mov ebx, edx pop eax edx ecx edi sub ebx, edx mov al, 11 ret ;---------------------------------------------------------------- ; ; fs_FloppyReadFolder - LFN variant for reading floppy folders ; ; esi points to filename ; ebx pointer to structure: 32-bit number = first wanted block, 0+ ; & flags (bitfields) ; flags: bit 0: 0=ANSI names, 1=UNICODE names ; ecx number of blocks to read, 0+ ; edx mem location to return data ; ; ret ebx = blocks read or 0xffffffff folder not found ; eax = 0 ok read or other = errormsg ; ;-------------------------------------------------------------- fs_FloppyReadFolder: call read_flp_fat push edi cmp byte [esi], 0 jz .root call fd_find_lfn jnc .found pop edi or ebx, -1 mov eax, ERROR_FILE_NOT_FOUND ret .found: test byte [edi+11], 0x10 ; do not allow read files jnz .found_dir pop edi or ebx, -1 mov eax, ERROR_ACCESS_DENIED ret .found_dir: movzx eax, word [edi+26] add eax, 31 push 0 jmp .doit .root: mov eax, 19 push 14 .doit: push ecx ebp sub esp, 262*2 ; reserve space for LFN mov ebp, esp push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE names mov ebx, [ebx] ; init header push eax ecx mov edi, edx mov ecx, 32/4 xor eax, eax rep stosd pop ecx eax mov byte [edx], 1 ; version mov esi, edi ; esi points to BDFE .main_loop: pusha call read_chs_sector popa cmp [FDC_Status], 0 jnz .error mov edi, FDD_BUFF push eax .l1: call fat_get_name jc .l2 cmp byte [edi+11], 0xF jnz .do_bdfe add edi, 0x20 cmp edi, 0xD200 jb .do_bdfe pop eax inc eax dec byte [esp+262*2+12] jz .done jns @f ; read next sector from FAT mov eax, [(eax-31-1)*2+0x282000] and eax, 0xFFF cmp eax, 0xFF8 jae .done add eax, 31 mov byte [esp+262*2+12], 0 @@: pusha call read_chs_sector popa cmp [FDC_Status], 0 jnz .error mov edi, FDD_BUFF push eax .do_bdfe: inc dword [edx+8] ; new file found dec ebx jns .l2 dec ecx js .l2 inc dword [edx+4] ; new file block copied call fat_entry_to_bdfe .l2: add edi, 0x20 cmp edi, 0xD200 jb .l1 pop eax inc eax dec byte [esp+262*2+12] jz .done jns @f ; read next sector from FAT mov eax, [(eax-31-1)*2+0x282000] and eax, 0xFFF cmp eax, 0xFF8 jae .done add eax, 31 mov byte [esp+262*2+12], 0 @@: jmp .main_loop .error: add esp, 262*2+4 pop ebp ecx edi edi or ebx, -1 mov eax, ERROR_FILE_NOT_FOUND ret .done: add esp, 262*2+4 pop ebp mov ebx, [edx+4] xor eax, eax dec ecx js @f mov al, ERROR_END_OF_FILE @@: pop ecx edi edi ret ;---------------------------------------------------------------- ; ; fs_FloppyRewrite - LFN variant for writing sys floppy ; ; esi points to filename ; ebx ignored (reserved) ; ecx number of bytes to write, 0+ ; edx mem location to data ; ; ret ebx = number of written bytes ; eax = 0 ok read or other = errormsg ; ;-------------------------------------------------------------- @@: mov eax, ERROR_ACCESS_DENIED xor ebx, ebx ret fsfrfe2: popad fsfrfe: mov eax, 11 xor ebx, ebx ret fs_FloppyCreateFolder: mov al, 1 jmp fs_FloppyRewrite.common fs_FloppyRewrite: xor eax, eax .common: cmp byte [esi], 0 jz @b call read_flp_fat cmp [FDC_Status], 0 jnz fsfrfe pushad xor ebp, ebp push esi @@: lodsb test al, al jz @f cmp al, '/' jnz @b lea ebp, [esi-1] jmp @b @@: pop esi test ebp, ebp jnz .noroot call read_flp_root cmp [FDC_Status], 0 jnz fsfrfe2 push flp_rootmem_extend_dir push flp_rootmem_end_write push flp_rootmem_next_write push flp_rootmem_begin_write xor ebp, ebp push ebp push flp_rootmem_first push flp_rootmem_next jmp .common1 .noroot: mov eax, ERROR_ACCESS_DENIED cmp byte [ebp+1], 0 jz .ret1 ; check existence mov byte [ebp], 0 call fd_find_lfn mov byte [ebp], '/' lea esi, [ebp+1] jnc @f mov eax, ERROR_FILE_NOT_FOUND .ret1: mov [esp+28], eax popad xor ebx, ebx ret @@: test byte [edi+11], 0x10 ; must be directory mov eax, ERROR_ACCESS_DENIED jz .ret1 movzx ebp, word [edi+26] ; ebp=cluster mov eax, ERROR_FAT_TABLE cmp ebp, 2 jb .ret1 cmp ebp, 2849 jae .ret1 push flp_notroot_extend_dir push flp_notroot_end_write push flp_notroot_next_write push flp_notroot_begin_write push ebp push flp_notroot_first push flp_notroot_next .common1: call fat_find_lfn jc .notfound ; found test byte [edi+11], 10h jz .exists_file ; found directory; if we are creating directory, return OK, ; if we are creating file, say "access denied" add esp, 28 popad test al, al mov eax, ERROR_ACCESS_DENIED jz @f mov al, 0 @@: xor ebx, ebx ret .exists_file: ; found file; if we are creating directory, return "access denied", ; if we are creating file, delete existing file and continue cmp byte [esp+28+28], 0 jz @f add esp, 28 popad mov eax, ERROR_ACCESS_DENIED xor ebx, ebx ret @@: ; delete FAT chain push edi xor eax, eax mov dword [edi+28], eax ; zero size xchg ax, word [edi+26] ; start cluster test eax, eax jz .done1 @@: cmp eax, 0xFF8 jae .done1 lea edi, [FLOPPY_FAT + eax*2] ; position in FAT xor eax, eax xchg ax, [edi] jmp @b .done1: pop edi call get_time_for_file mov [edi+22], ax call get_date_for_file mov [edi+24], ax mov [edi+18], ax or byte [edi+11], 20h ; set 'archive' attribute jmp .doit .notfound: ; file is not found; generate short name call fat_name_is_legal jc @f add esp, 28 popad mov eax, ERROR_FILE_NOT_FOUND xor ebx, ebx ret @@: sub esp, 12 mov edi, esp call fat_gen_short_name .test_short_name_loop: push esi edi ecx mov esi, edi lea eax, [esp+12+12+8] mov [eax], ebp call dword [eax-4] jc .found .test_short_name_entry: cmp byte [edi+11], 0xF jz .test_short_name_cont mov ecx, 11 push esi edi repz cmpsb pop edi esi jz .short_name_found .test_short_name_cont: lea eax, [esp+12+12+8] call dword [eax-8] jnc .test_short_name_entry jmp .found .short_name_found: pop ecx edi esi call fat_next_short_name jnc .test_short_name_loop .disk_full: add esp, 12+28 popa mov eax, ERROR_DISK_FULL xor ebx, ebx ret .found: pop ecx edi esi ; now find space in directory ; we need to save LFN <=> LFN is not equal to short name <=> generated name contains '~' mov al, '~' push ecx edi mov ecx, 8 repnz scasb push 1 pop eax ; 1 entry jnz .notilde ; we need ceil(strlen(esi)/13) additional entries = floor((strlen(esi)+12+13)/13) total xor eax, eax @@: cmp byte [esi], 0 jz @f inc esi inc eax jmp @b @@: sub esi, eax add eax, 12+13 mov ecx, 13 push edx cdq div ecx pop edx .notilde: push -1 push -1 ; find successive entries in directory xor ecx, ecx push eax lea eax, [esp+12+8+12+8] mov [eax], ebp call dword [eax-4] pop eax jnc .scan_dir .fsfrfe3: add esp, 8+8+12+28 popad mov eax, 11 xor ebx, ebx ret .scan_dir: cmp byte [edi], 0 jz .free cmp byte [edi], 0xE5 jz .free xor ecx, ecx .scan_cont: push eax lea eax, [esp+12+8+12+8] call dword [eax-8] pop eax jnc .scan_dir cmp [FDC_Status], 0 jnz .fsfrfe3 push eax lea eax, [esp+12+8+12+8] call dword [eax+16] ; extend directory pop eax jnc .scan_dir add esp, 8+8+12+28 popad mov eax, ERROR_DISK_FULL xor ebx, ebx ret .free: test ecx, ecx jnz @f mov [esp], edi mov ecx, [esp+8+8+12+8] mov [esp+4], ecx xor ecx, ecx @@: inc ecx cmp ecx, eax jb .scan_cont ; found! ; calculate name checksum push esi ecx mov esi, [esp+8+8] mov ecx, 11 xor eax, eax @@: ror al, 1 add al, [esi] inc esi loop @b pop ecx esi pop edi pop dword [esp+8+12+8] ; edi points to first entry in free chunk dec ecx jz .nolfn push esi push eax lea eax, [esp+8+8+12+8] call dword [eax+4] ; begin write mov al, 40h .writelfn: or al, cl mov esi, [esp+4] push ecx dec ecx imul ecx, 13 add esi, ecx stosb mov cl, 5 call fs_RamdiskRewrite.read_symbols mov ax, 0xF stosw mov al, [esp+4] stosb mov cl, 6 call fs_RamdiskRewrite.read_symbols xor eax, eax stosw mov cl, 2 call fs_RamdiskRewrite.read_symbols pop ecx lea eax, [esp+8+8+12+8] call dword [eax+8] ; next write xor eax, eax loop .writelfn pop eax pop esi ; lea eax, [esp+8+12+8] ; call dword [eax+12] ; end write .nolfn: xchg esi, [esp] mov ecx, 11 rep movsb mov word [edi], 20h ; attributes sub edi, 11 pop esi ecx add esp, 12 mov byte [edi+13], 0 ; tenths of a second at file creation time call get_time_for_file mov [edi+14], ax ; creation time mov [edi+22], ax ; last write time call get_date_for_file mov [edi+16], ax ; creation date mov [edi+24], ax ; last write date mov [edi+18], ax ; last access date and word [edi+20], 0 ; high word of cluster and word [edi+26], 0 ; low word of cluster - to be filled and dword [edi+28], 0 ; file size - to be filled cmp byte [esp+28+28], 0 jz .doit ; create directory mov byte [edi+11], 10h ; attributes: folder mov ecx, 32*2 mov edx, edi .doit: lea eax, [esp+8] call dword [eax+12] ; flush directory push ecx push edi push 0 mov esi, edx test ecx, ecx jz .done mov ecx, 2849 mov edi, FLOPPY_FAT push 0 ; first cluster .write_loop: ; allocate new cluster xor eax, eax repnz scasw mov al, ERROR_DISK_FULL jnz .ret dec edi dec edi lea eax, [edi-(FLOPPY_FAT)] shr eax, 1 ; eax = cluster mov word [edi], 0xFFF ; mark as last cluster xchg edi, [esp+4] cmp dword [esp], 0 jz .first stosw jmp @f .first: mov [esp], eax @@: mov edi, [esp+4] inc ecx ; write data push ecx edi mov ecx, 512 cmp dword [esp+20], ecx jae @f mov ecx, [esp+20] @@: mov edi, FDD_BUFF cmp byte [esp+24+28+28], 0 jnz .writedir push ecx rep movsb pop ecx .writedircont: push ecx sub ecx, 512 neg ecx push eax xor eax, eax rep stosb pop eax add eax, 31 pusha call save_chs_sector popa pop ecx cmp [FDC_Status], 0 jnz .diskerr sub [esp+20], ecx pop edi ecx jnz .write_loop .done: xor eax, eax .ret: pop ebx edi edi ecx mov [esp+28+28], eax lea eax, [esp+8] call dword [eax+4] mov [edi+26], bx mov ebx, esi sub ebx, edx mov [edi+28], ebx call dword [eax+12] mov [esp+28+16], ebx test ebp, ebp jnz @f call save_flp_root @@: add esp, 28 cmp [FDC_Status], 0 jnz .err3 call save_flp_fat cmp [FDC_Status], 0 jnz .err3 popa ret .err3: popa mov al, 11 xor ebx, ebx ret .diskerr: sub esi, ecx mov eax, 11 pop edi ecx jmp .ret .writedir: push ecx mov ecx, 32/4 push ecx esi rep movsd pop esi ecx mov dword [edi-32], '. ' mov dword [edi-32+4], ' ' mov dword [edi-32+8], ' ' mov byte [edi-32+11], 10h mov word [edi-32+26], ax push esi rep movsd pop esi mov dword [edi-32], '.. ' mov dword [edi-32+4], ' ' mov dword [edi-32+8], ' ' mov byte [edi-32+11], 10h mov ecx, [esp+28+8] mov word [edi-32+26], cx pop ecx jmp .writedircont ;---------------------------------------------------------------- ; ; fs_FloppyWrite - LFN variant for writing to floppy ; ; esi points to filename ; ebx pointer to 64-bit number = first wanted byte, 0+ ; may be ebx=0 - start from first byte ; ecx number of bytes to write, 0+ ; edx mem location to data ; ; ret ebx = bytes written (maybe 0) ; eax = 0 ok write or other = errormsg ; ;-------------------------------------------------------------- @@: push ERROR_ACCESS_DENIED fs_FloppyWrite.ret0: pop eax xor ebx, ebx ret fs_FloppyWrite.ret11: push 11 jmp fs_FloppyWrite.ret0 fs_FloppyWrite: cmp byte [esi], 0 jz @b call read_flp_fat cmp [FDC_Status], 0 jnz .ret11 pushad call fd_find_lfn jnc .found popad push ERROR_FILE_NOT_FOUND jmp .ret0 .found: ; FAT does not support files larger than 4GB test ebx, ebx jz .l1 cmp dword [ebx+4], 0 jz @f .eof: popad push ERROR_END_OF_FILE jmp .ret0 @@: mov ebx, [ebx] .l1: ; now edi points to direntry, ebx=start byte to write, ; ecx=number of bytes to write, edx=data pointer ; extend file if needed add ecx, ebx jc .eof ; FAT does not support files larger than 4GB push eax ; save directory cluster push 0 ; return value=0 call get_time_for_file mov [edi+22], ax ; last write time call get_date_for_file mov [edi+24], ax ; last write date mov [edi+18], ax ; last access date push dword [edi+28] ; save current file size cmp ecx, [edi+28] jbe .length_ok cmp ecx, ebx jz .length_ok call floppy_extend_file jnc .length_ok mov [esp+4], eax ; floppy_extend_file can return two error codes: FAT table error or disk full. ; First case is fatal error, in second case we may write some data cmp al, ERROR_DISK_FULL jz .disk_full pop eax pop eax mov [esp+4+28], eax pop eax popad xor ebx, ebx ret .disk_full: ; correct number of bytes to write mov ecx, [edi+28] cmp ecx, ebx ja .length_ok .ret: pop eax pop eax mov [esp+4+28], eax ; eax=return value pop eax sub edx, [esp+20] mov [esp+16], edx ; ebx=number of written bytes popad ret .length_ok: ; save FAT & directory ; note that directory must be saved first because save_flp_fat uses buffer at 0xD000 mov esi, [edi+28] movzx edi, word [edi+26] ; starting cluster mov eax, [esp+8] pusha call save_chs_sector popa cmp [FDC_Status], 0 jnz .device_err call save_flp_fat cmp [FDC_Status], 0 jz @f .device_err: mov byte [esp+4], 11 jmp .ret @@: ; now ebx=start pos, ecx=end pos, both lie inside file sub ecx, ebx jz .ret call SetUserInterrupts .write_loop: ; skip unmodified sectors cmp dword [esp], 0x200 jb .modify sub ebx, 0x200 jae .skip add ebx, 0x200 .modify: lea eax, [edi+31] ; current sector ; get length of data in current sector push ecx sub ebx, 0x200 jb .hasdata neg ebx xor ecx, ecx jmp @f .hasdata: neg ebx cmp ecx, ebx jbe @f mov ecx, ebx @@: ; load sector if needed cmp dword [esp+4], 0 ; we don't need to read uninitialized data jz .noread cmp ecx, 0x200 ; we don't need to read sector if it is fully rewritten jz .noread cmp ecx, esi ; (same for the last sector) jz .noread pusha call read_chs_sector popa cmp [FDC_Status], 0 jz @f .device_err2: pop ecx jmp .device_err @@: .noread: ; zero uninitialized data if file was extended (because floppy_extend_file does not this) push eax ecx edi xor eax, eax mov ecx, 0x200 sub ecx, [esp+4+12] jbe @f mov edi, FDD_BUFF add edi, [esp+4+12] rep stosb @@: ; zero uninitialized data in the last sector mov ecx, 0x200 sub ecx, esi jbe @f mov edi, FDD_BUFF add edi, esi rep stosb @@: pop edi ecx eax ; copy new data push eax mov eax, edx neg ebx jecxz @f add ebx, FDD_BUFF+0x200 call memmove xor ebx, ebx @@: pop eax ; save sector pusha call save_chs_sector popa cmp [FDC_Status], 0 jnz .device_err2 add edx, ecx sub [esp], ecx pop ecx jz .done .skip: .next_cluster: movzx edi, word [edi*2+0x282000] sub esi, 0x200 jae @f xor esi, esi @@: sub dword [esp], 0x200 jae .write_loop and dword [esp], 0 jmp .write_loop .done: mov [fdc_irq_func], fdc_null jmp .ret floppy_extend_file.zero_size: xor eax, eax jmp floppy_extend_file.start_extend ; extends file on floppy to given size (new data area is undefined) ; in: edi->direntry, ecx=new size ; out: CF=0 => OK, eax=0 ; CF=1 => error, eax=code (ERROR_FAT_TABLE or ERROR_DISK_FULL) floppy_extend_file: push ecx ; find the last cluster of file movzx eax, word [edi+26] ; first cluster mov ecx, [edi+28] jecxz .zero_size @@: sub ecx, 0x200 jbe @f mov eax, [eax*2+0x282000] and eax, 0xFFF jz .fat_err cmp eax, 0xFF8 jb @b .fat_err: pop ecx push ERROR_FAT_TABLE pop eax stc ret @@: push eax mov eax, [eax*2+0x282000] and eax, 0xFFF cmp eax, 0xFF8 pop eax jb .fat_err ; set length to full number of sectors sub [edi+28], ecx .start_extend: pop ecx ; now do extend push edx esi mov esi, 0x282000+2*2 ; start scan from cluster 2 mov edx, 2847 ; number of clusters to scan .extend_loop: cmp [edi+28], ecx jae .extend_done ; add new sector push ecx push edi .scan: mov ecx, edx mov edi, esi jecxz .disk_full push eax xor eax, eax repnz scasw pop eax jnz .disk_full mov word [edi-2], 0xFFF mov esi, edi mov edx, ecx sub edi, 0x282000 shr edi, 1 dec edi ; now edi=new cluster test eax, eax jz .first_cluster mov [0x282000+eax*2], di jmp @f .first_cluster: pop eax ; eax->direntry push eax mov [eax+26], di @@: mov eax, edi ; eax=new cluster pop edi ; edi->direntry pop ecx ; ecx=required size add dword [edi+28], 0x200 jmp .extend_loop .extend_done: mov [edi+28], ecx pop esi edx xor eax, eax ; CF=0 ret .disk_full: pop edi ecx pop esi edx stc push ERROR_DISK_FULL pop eax ret ;---------------------------------------------------------------- ; ; fs_FloppySetFileEnd - set end of file on floppy ; ; esi points to filename ; ebx points to 64-bit number = new file size ; ecx ignored (reserved) ; edx ignored (reserved) ; ; ret eax = 0 ok or other = errormsg ; ;-------------------------------------------------------------- fs_FloppySetFileEnd: call read_flp_fat cmp [FDC_Status], 0 jnz ret11 cmp byte [esi], 0 jnz @f .access_denied: push ERROR_ACCESS_DENIED jmp .ret @@: push edi call fd_find_lfn jnc @f pop edi push ERROR_FILE_NOT_FOUND .ret: pop eax jmp .doret @@: ; must not be directory test byte [edi+11], 10h jz @f pop edi jmp .access_denied @@: ; file size must not exceed 4 Gb cmp dword [ebx+4], 0 jz @f pop edi push ERROR_END_OF_FILE jmp .ret @@: push eax ; set file modification date/time to current call fat_update_datetime mov eax, [ebx] cmp eax, [edi+28] jb .truncate ja .expand pop eax pushad call save_chs_sector popad pop edi xor eax, eax cmp [FDC_Status], 0 jz @f mov al, 11 @@: .doret: mov [fdc_irq_func], fdc_null ret .expand: push ecx push dword [edi+28] ; save old size mov ecx, eax call floppy_extend_file push eax ; return code jnc .expand_ok cmp al, ERROR_DISK_FULL jz .disk_full pop eax ecx ecx edi edi jmp .doret .device_err: pop eax .device_err2: pop ecx ecx eax edi push 11 jmp .ret .disk_full: .expand_ok: ; save directory & FAT mov eax, [edi+28] xchg eax, [esp+12] movzx edi, word [edi+26] pusha call save_chs_sector popa cmp [FDC_Status], 0 jnz .device_err call save_flp_fat cmp [FDC_Status], 0 jnz .device_err call SetUserInterrupts ; now zero new data ; edi = current cluster, [esp+12]=new size, [esp+4]=old size, [esp]=return code .zero_loop: sub dword [esp+4], 0x200 jae .next_cluster cmp dword [esp+4], -0x200 jz .noread lea eax, [edi+31] pusha call read_chs_sector popa cmp [FDC_Status], 0 jnz .err_next .noread: mov ecx, [esp+4] neg ecx push edi mov edi, FDD_BUFF+0x200 add edi, [esp+8] xor eax, eax mov [esp+8], eax rep stosb pop edi lea eax, [edi+31] pusha call save_chs_sector popa cmp [FDC_Status], 0 jz .next_cluster .err_next: mov byte [esp], 11 .next_cluster: sub dword [esp+12], 0x200 jbe .expand_done movzx edi, word [0x282000+edi*2] jmp .zero_loop .expand_done: pop eax ecx ecx edi edi jmp .doret .truncate: mov [edi+28], eax push ecx movzx ecx, word [edi+26] test eax, eax jz .zero_size ; find new last sector @@: sub eax, 0x200 jbe @f movzx ecx, word [0x282000+ecx*2] jmp @b @@: ; we will zero data at the end of last sector - remember it push ecx ; terminate FAT chain lea ecx, [0x282000+ecx+ecx] push dword [ecx] mov word [ecx], 0xFFF pop ecx and ecx, 0xFFF jmp .delete .zero_size: and word [edi+26], 0 push 0 .delete: ; delete FAT chain starting with ecx ; mark all clusters as free cmp ecx, 0xFF8 jae .deleted lea ecx, [0x282000+ecx+ecx] push dword [ecx] and word [ecx], 0 pop ecx and ecx, 0xFFF jmp .delete .deleted: mov edi, [edi+28] ; save directory & FAT mov eax, [esp+8] pusha call save_chs_sector popa cmp [FDC_Status], 0 jnz .device_err2 call save_flp_fat cmp [FDC_Status], 0 jnz .device_err2 ; zero last sector, ignore errors pop eax add eax, 31 and edi, 0x1FF jz .truncate_done call SetUserInterrupts pusha call read_chs_sector popa add edi, FDD_BUFF mov ecx, FDD_BUFF+0x200 sub ecx, edi push eax xor eax, eax rep stosb pop eax pusha call save_chs_sector popa .truncate_done: pop ecx eax edi xor eax, eax jmp .doret fs_FloppyGetFileInfo: call read_flp_fat cmp [FDC_Status], 0 jnz ret11 cmp byte [esi], 0 jnz @f mov eax, 2 ; unsupported ret @@: push edi call fd_find_lfn jmp fs_GetFileInfo_finish ret11: mov eax, 11 ret fs_FloppySetFileInfo: call read_flp_fat cmp [FDC_Status], 0 jnz ret11 cmp byte [esi], 0 jnz @f mov eax, 2 ; unsupported ret @@: push edi call fd_find_lfn jnc @f pop edi mov eax, ERROR_FILE_NOT_FOUND ret @@: push eax call bdfe_to_fat_entry pop eax pusha call save_chs_sector popa pop edi xor eax, eax cmp [FDC_Status], 0 jz @f mov al, 11 @@: ret if 0 ;---------------------------------------------------------------- ; ; fs_FloppyExecute - LFN variant for executing from floppy ; ; esi points to floppy filename (e.g. 'dir1/name') ; ebp points to full filename (e.g. '/fd/1/dir1/name') ; dword [ebx] = flags ; dword [ebx+4] = cmdline ; ; ret ebx,edx destroyed ; eax > 0 - PID, < 0 - error ; ;-------------------------------------------------------------- fs_FloppyExecute: mov edx, [ebx] mov ebx, [ebx+4] test ebx, ebx jz @f add ebx, std_application_base_address @@: ;---------------------------------------------------------------- ; ; fs_FloppyExecute.flags - second entry ; ; esi points to floppy filename (kernel address) ; ebp points to full filename ; edx flags ; ebx cmdline (kernel address) ; ; ret eax > 0 - PID, < 0 - error ; ;-------------------------------------------------------------- .flags: call read_flp_fat cmp byte [esi], 0 jnz @f ; cannot execute root! mov eax, -ERROR_ACCESS_DENIED ret @@: push edi call fd_find_lfn jnc .found pop edi mov eax, -ERROR_FILE_NOT_FOUND ret .found: movzx eax, word [edi+26] ; cluster push eax push dword [edi+28] ; size push .DoRead call fs_execute add esp, 12 pop edi ret .DoRead: ; read next block ; in: eax->parameters, edi->buffer ; out: eax = error code pushad cmp dword [eax], 0 ; file size jz .eof mov eax, [eax+4] ; cluster add eax, 31 call read_chs_sector cmp [FDC_Status], 0 jnz .err pop edi mov esi, FDD_BUFF push edi mov ecx, 512/4 rep movsd mov eax, [esp+28] mov ecx, [eax] sub ecx, 512 jae @f add edi, ecx neg ecx push eax xor eax, eax rep stosb pop eax @@: mov [eax], ecx mov edx, [eax+4] mov dx, [edx*2+0x282000] mov [eax+4], dx ; high word is already zero popad xor eax, eax ret .eof: popad mov eax, 6 ret .err: popad mov eax, 11 ret end if ;---------------------------------------------------------------- ; ; fs_FloppyDelete - delete file or empty folder from floppy ; ; esi points to filename ; ; ret eax = 0 ok or other = errormsg ; ;-------------------------------------------------------------- fs_FloppyDelete: call read_flp_fat cmp [FDC_Status], 0 jz @f push 11 jmp .pop_ret @@: cmp byte [esi], 0 jnz @f ; cannot delete root! .access_denied: push ERROR_ACCESS_DENIED .pop_ret: pop eax ret @@: and [fd_prev_sector], 0 and [fd_prev_prev_sector], 0 push edi call fd_find_lfn jnc .found pop edi push ERROR_FILE_NOT_FOUND jmp .pop_ret .found: cmp dword [edi], '. ' jz .access_denied2 cmp dword [edi], '.. ' jz .access_denied2 test byte [edi+11], 10h jz .dodel ; we can delete only empty folders! push eax movzx eax, word [edi+26] push ebx pusha add eax, 31 call read_chs_sector popa mov ebx, FDD_BUFF + 2*0x20 .checkempty: cmp byte [ebx], 0 jz .empty cmp byte [ebx], 0xE5 jnz .notempty add ebx, 0x20 cmp ebx, FDD_BUFF + 0x200 jb .checkempty movzx eax, word [FLOPPY_FAT + eax*2] pusha add eax, 31 call read_chs_sector popa mov ebx, FDD_BUFF jmp .checkempty .notempty: pop ebx pop eax .access_denied2: pop edi jmp .access_denied .empty: pop ebx pop eax pusha call read_chs_sector popa .dodel: push eax movzx eax, word [edi+26] xchg eax, [esp] ; delete folder entry mov byte [edi], 0xE5 ; delete LFN (if present) .lfndel: cmp edi, FDD_BUFF ja @f cmp [fd_prev_sector], 0 jz .lfndone push [fd_prev_sector] push [fd_prev_prev_sector] pop [fd_prev_sector] and [fd_prev_prev_sector], 0 pusha call save_chs_sector popa pop eax pusha call read_chs_sector popa mov edi, FDD_BUFF+0x200 @@: sub edi, 0x20 cmp byte [edi], 0xE5 jz .lfndone cmp byte [edi+11], 0xF jnz .lfndone mov byte [edi], 0xE5 jmp .lfndel .lfndone: pusha call save_chs_sector popa ; delete FAT chain pop eax test eax, eax jz .done @@: lea eax, [FLOPPY_FAT + eax*2] push dword [eax] and word [eax], 0 pop eax and eax, 0xFFF jnz @b .done: call save_flp_fat pop edi xor eax, eax ret ; \end{diamond}