;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; ;; ;; 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,[0x3000] shl eax,5 mov eax,[eax+0x3000+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,0x8000 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,0xD000 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,0x8000 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,0x8000 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,0x8000 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,0xD000+39 mov ecx,15 cld rep cmpsb je same_label mov [root_read],0 mov [flp_fat],0 same_label: mov esi,0xD000+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,0x8000 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,0x8000 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,0x8000 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,0x8000+0x1200 ;4274 bytes - all used FAT jb fcnew2_1 mov esi,0x8000 ; duplicate fat chain mov edi,0x8000+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,0xD000 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,0x8000 ;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,0xD000 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,0xD000 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,0xD000 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,0xD000 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,0xD000 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 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 flp_root_first: mov eax, [eax] pusha add eax, 19 call read_chs_sector popa cmp [FDC_Status], 0 jnz .readerr mov edi, 0xD000 ret ; CF=0 .readerr: stc ret flp_rootmem_first: mov edi, 0x8000 clc ret flp_rootmem_next: add edi, 0x20 cmp edi, 0x8000+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] mov ecx, [ecx*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, 0xD000 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, 0xD000 mov ecx, 128 rep stosd popa call flp_notroot_end_write mov edi, 0xD000 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, [0xD000+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, 0xD000 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, 0xD000 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_FloppyRewrite: 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: ; 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; must not be directory test byte [edi+11], 10h 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, [0x282000 + 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 .doit: lea eax, [esp+8] call dword [eax+12] ; flush directory push ecx push edi push 0 mov esi, edx jecxz .done mov ecx, 2849 mov edi, 0x282000 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-0x282000] 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] @@: push ecx mov edi, 0xD000 rep movsb pop ecx 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 ;---------------------------------------------------------------- ; ; 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: 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, 0xD000 add edi, [esp+4+12] rep stosb @@: ; zero uninitialized data in the last sector mov ecx, 0x200 sub ecx, esi jbe @f mov edi, 0xD000 add edi, esi rep stosb @@: pop edi ecx eax ; copy new data push eax mov eax, edx neg ebx jecxz @f add ebx, 0xD000+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 .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, 0xD000+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, 0xD000 mov ecx, 0xD000+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 ;---------------------------------------------------------------- ; ; 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, 0xD000 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{diamond}