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kolibrios-gitea/kernel/trunk/fs/fat32.inc

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Style corrected for new rules, no semantic changes git-svn-id: svn://kolibrios.org@2288 a494cfbc-eb01-0410-851d-a64ba20cac60
2011-10-14 23:38:50 +02:00
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License ;;
;; ;;
;; FAT32.INC ;;
;; ;;
;; FAT16/32 functions for KolibriOS ;;
;; ;;
;; Copyright 2002 Paolo Minazzi, paolo.minazzi@inwind.it ;;
;; ;;
;; See file COPYING for details ;;
;; 04.02.2007 LFN create folder - diamond ;;
;; 08.10.2006 LFN delete file/folder - diamond ;;
;; 20.08.2006 LFN set file size (truncate/extend) - diamond ;;
;; 17.08.2006 LFN write/append to file - diamond ;;
;; 23.06.2006 LFN start application - diamond ;;
;; 15.06.2006 LFN get/set file/folder info - diamond ;;
;; 27.05.2006 LFN create/rewrite file - diamond ;;
;; 04.05.2006 LFN read folder - diamond ;;
;; 29.04.2006 Elimination of hangup after the ;;
;; expiration hd_wait_timeout - Mario79 ;;
;; 23.04.2006 LFN read file - diamond ;;
;; 28.01.2006 find all Fat16/32 partition in all input point ;;
;; to MBR, see file part_set.inc - Mario79 ;;
;; 15.01.2005 get file size/attr/date, file_append - ATV ;;
;; 04.12.2004 skip volume label, file delete bug fixed - ATV ;;
;; 29.11.2004 get_free_FAT changed, append dir bug fixed - ATV ;;
;; 23.11.2004 don't allow overwrite dir with file - ATV ;;
;; 18.11.2004 get_disk_info and more error codes - ATV ;;
;; 17.11.2004 set_FAT/get_FAT and disk cache rewritten - ATV ;;
;; 10.11.2004 removedir clear whole directory structure - ATV ;;
;; 08.11.2004 rename - ATV ;;
;; 30.10.2004 file_read return also dirsize in bytes - ATV ;;
;; 20.10.2004 Makedir/Removedir - ATV ;;
;; 14.10.2004 Partition chain/Fat16 - ATV (thanks drh3xx) ;;
;; 06.9.2004 Fix free space by Mario79 added - MH ;;
;; 24.5.2004 Write back buffer for File_write -VT ;;
;; 20.5.2004 File_read function to work with syscall 58 - VT ;;
;; 30.3.2004 Error parameters at function return - VT ;;
;; 01.5.2002 Bugfix in device write - VT ;;
;; 20.5.2002 Hd status check - VT ;;
;; 29.6.2002 Improved fat32 verification - VT ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision$
cache_max equ 1919 ; max. is 1919*512+0x610000=0x6ffe00
ERROR_SUCCESS = 0
ERROR_DISK_BASE = 1
ERROR_UNSUPPORTED_FS = 2
ERROR_UNKNOWN_FS = 3
ERROR_PARTITION = 4
ERROR_FILE_NOT_FOUND = 5
ERROR_END_OF_FILE = 6
ERROR_MEMORY_POINTER = 7
ERROR_DISK_FULL = 8
ERROR_FAT_TABLE = 9
ERROR_ACCESS_DENIED = 10
ERROR_DEVICE = 11
PUSHAD_EAX equ [esp+28]
PUSHAD_ECX equ [esp+24]
PUSHAD_EDX equ [esp+20]
PUSHAD_EBX equ [esp+16]
PUSHAD_EBP equ [esp+8]
PUSHAD_ESI equ [esp+4]
PUSHAD_EDI equ [esp+0]
uglobal
align 4
partition_count dd 0 ; partitions found by set_FAT32_variables
longname_sec1 dd 0 ; used by analyze_directory to save 2 previous
longname_sec2 dd 0 ; directory sectors for delete long filename
hd_error dd 0 ; set by wait_for_sector_buffer
hd_setup dd 0
hd_wait_timeout dd 0
cluster_tmp dd 0 ; used by analyze_directory
; and analyze_directory_to_write
file_size dd 0 ; used by file_read
cache_search_start dd 0 ; used by find_empty_slot
endg
iglobal
fat_in_cache dd -1
endg
uglobal
align 4
fat_cache:
times 512 db 0
Sector512: ; label for dev_hdcd.inc
buffer:
times 512 db 0
fsinfo_buffer:
times 512 db 0
endg
uglobal
fat16_root db 0 ; flag for fat16 rootdir
fat_change db 0 ; 1=fat has changed
endg
reserve_hd1:
cli
cmp [hd1_status], 0
je reserve_ok1
sti
call change_task
jmp reserve_hd1
reserve_ok1:
push eax
mov eax, [CURRENT_TASK]
shl eax, 5
mov eax, [eax+CURRENT_TASK+TASKDATA.pid]
mov [hd1_status], eax
pop eax
sti
ret
;********************************************
uglobal
hd_in_cache db ?
endg
reserve_hd_channel:
; BIOS disk accesses are protected with common mutex hd1_status
; This must be modified when hd1_status will not be valid!
cmp [hdpos], 0x80
jae .ret
cmp [hdbase], 0x1F0
jne .IDE_Channel_2
.IDE_Channel_1:
cli
cmp [IDE_Channel_1], 0
je .reserve_ok_1
sti
call change_task
jmp .IDE_Channel_1
.IDE_Channel_2:
cli
cmp [IDE_Channel_2], 0
je .reserve_ok_2
sti
call change_task
jmp .IDE_Channel_2
.reserve_ok_1:
mov [IDE_Channel_1], 1
push eax
mov al, 1
jmp @f
.reserve_ok_2:
mov [IDE_Channel_2], 1
push eax
mov al, 3
@@:
cmp [hdid], 1
sbb al, -1
cmp al, [hd_in_cache]
jz @f
mov [hd_in_cache], al
call clear_hd_cache
@@:
pop eax
sti
.ret:
ret
free_hd_channel:
; see comment at reserve_hd_channel
cmp [hdpos], 0x80
jae .ret
cmp [hdbase], 0x1F0
jne .IDE_Channel_2
.IDE_Channel_1:
mov [IDE_Channel_1], 0
.ret:
ret
.IDE_Channel_2:
mov [IDE_Channel_2], 0
ret
;********************************************
problem_partition db 0 ; used for partitions search
include 'part_set.inc'
set_FAT:
;--------------------------------
; input : EAX = cluster
; EDX = value to save
; output : EDX = old value
;--------------------------------
push eax ebx esi
cmp eax, 2
jb sfc_error
cmp eax, [LAST_CLUSTER]
ja sfc_error
cmp [fs_type], 16
je sfc_1
add eax, eax
sfc_1:
add eax, eax
mov esi, 511
and esi, eax ; esi = position in fat sector
shr eax, 9 ; eax = fat sector
add eax, [FAT_START]
mov ebx, fat_cache
cmp eax, [fat_in_cache]; is fat sector already in memory?
je sfc_in_cache ; yes
cmp [fat_change], 0 ; is fat changed?
je sfc_no_change ; no
call write_fat_sector; yes. write it into disk
cmp [hd_error], 0
jne sfc_error
sfc_no_change:
mov [fat_in_cache], eax; save fat sector
call hd_read
cmp [hd_error], 0
jne sfc_error
sfc_in_cache:
cmp [fs_type], 16
jne sfc_test32
sfc_set16:
xchg [ebx+esi], dx ; save new value and get old value
jmp sfc_write
sfc_test32:
mov eax, [fatMASK]
sfc_set32:
and edx, eax
xor eax, -1 ; mask for high bits
and eax, [ebx+esi] ; get high 4 bits
or eax, edx
mov edx, [ebx+esi] ; get old value
mov [ebx+esi], eax ; save new value
sfc_write:
mov [fat_change], 1 ; fat has changed
sfc_nonzero:
and edx, [fatMASK]
sfc_error:
pop esi ebx eax
ret
get_FAT:
;--------------------------------
; input : EAX = cluster
; output : EAX = next cluster
;--------------------------------
push ebx esi
cmp [fs_type], 16
je gfc_1
add eax, eax
gfc_1:
add eax, eax
mov esi, 511
and esi, eax ; esi = position in fat sector
shr eax, 9 ; eax = fat sector
add eax, [FAT_START]
mov ebx, fat_cache
cmp eax, [fat_in_cache]; is fat sector already in memory?
je gfc_in_cache
cmp [fat_change], 0 ; is fat changed?
je gfc_no_change ; no
call write_fat_sector; yes. write it into disk
cmp [hd_error], 0
jne hd_error_01
gfc_no_change:
mov [fat_in_cache], eax
call hd_read
cmp [hd_error], 0
jne hd_error_01
gfc_in_cache:
mov eax, [ebx+esi]
and eax, [fatMASK]
hd_error_01:
pop esi ebx
ret
get_free_FAT:
;-----------------------------------------------------------
; output : if CARRY=0 EAX = # first cluster found free
; if CARRY=1 disk full
; Note : for more speed need to use fat_cache directly
;-----------------------------------------------------------
push ecx
mov ecx, [LAST_CLUSTER]; counter for full disk
sub ecx, 2
mov eax, [fatStartScan]
cmp eax, 2
jb gff_reset
gff_test:
cmp eax, [LAST_CLUSTER]; if above last cluster start at cluster 2
jbe gff_in_range
gff_reset:
mov eax, 2
gff_in_range:
push eax
call get_FAT ; get cluster state
cmp [hd_error], 0
jne gff_not_found_1
test eax, eax ; is it free?
pop eax
je gff_found ; yes
inc eax ; next cluster
dec ecx ; is all checked?
jns gff_test ; no
gff_not_found_1:
add esp, 4
gff_not_found:
pop ecx ; yes. disk is full
stc
ret
gff_found:
lea ecx, [eax+1]
mov [fatStartScan], ecx
pop ecx
clc
ret
write_fat_sector:
;-----------------------------------------------------------
; write changed fat to disk
;-----------------------------------------------------------
push eax ebx ecx
mov [fat_change], 0
mov eax, [fat_in_cache]
cmp eax, -1
jz write_fat_not_used
mov ebx, fat_cache
mov ecx, [NUMBER_OF_FATS]
write_next_fat:
call hd_write
cmp [hd_error], 0
jne write_fat_not_used
add eax, [SECTORS_PER_FAT]
dec ecx
jnz write_next_fat
write_fat_not_used:
pop ecx ebx eax
ret
analyze_directory:
;-----------------------------------------------------------
; 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,ESI,EDI not changed
; IF CARRY=1 filename not found
; Note : if cluster=0 it's changed to read rootdir
; save 2 previous directory sectors in longname_sec
;-----------------------------------------------------------
push ecx edx esi edi ebx; ebx = [esp+0]
mov [longname_sec1], 0
mov [longname_sec2], 0
adr_new_cluster:
mov [cluster_tmp], eax
mov [fat16_root], 0
cmp eax, [LAST_CLUSTER]
ja adr_not_found ; too big cluster number, something is wrong
cmp eax, 2
jnb adr_data_cluster
mov eax, [ROOT_CLUSTER]; if cluster < 2 then read rootdir
cmp [fs_type], 16
jne adr_data_cluster
mov eax, [ROOT_START]
mov edx, [ROOT_SECTORS]
mov [fat16_root], 1 ; flag for fat16 rootdir
jmp adr_new_sector
adr_data_cluster:
sub eax, 2
mov edx, [SECTORS_PER_CLUSTER]
imul eax, edx
add eax, [DATA_START]
adr_new_sector:
mov ebx, buffer
call hd_read
cmp [hd_error], 0
jne adr_not_found
mov ecx, 512/32 ; count of dir entrys per sector = 16
adr_analyze:
mov edi, [ebx+11] ; file attribute
and edi, 0xf
cmp edi, 0xf
je adr_long_filename
test edi, 0x8 ; skip over volume label
jne adr_long_filename; Note: label can be same name as file/dir
mov esi, [esp+0] ; filename need to be uppercase
mov edi, ebx
push ecx
mov ecx, 11
cld
rep cmpsb ; compare 8+3 filename
pop ecx
je adr_found
adr_long_filename:
add ebx, 32 ; position of next dir entry
dec ecx
jnz adr_analyze
mov ecx, [longname_sec1]; save 2 previous directory sectors
mov [longname_sec1], eax; for delete long filename
mov [longname_sec2], ecx
inc eax ; next sector
dec edx
jne adr_new_sector
cmp [fat16_root], 1 ; end of fat16 rootdir
je adr_not_found
adr_next_cluster:
mov eax, [cluster_tmp]
call get_FAT ; get next cluster
cmp [hd_error], 0
jne adr_not_found
cmp eax, 2 ; incorrect fat chain?
jb adr_not_found ; yes
cmp eax, [fatRESERVED]; is it end of directory?
jb adr_new_cluster ; no. analyse it
adr_not_found:
pop edi edi esi edx ecx; first edi will remove ebx
stc ; file not found
ret
adr_found:
pop edi edi esi edx ecx; first edi will remove ebx
clc ; file found
ret
get_data_cluster:
;-----------------------------------------------------------
; input : EAX = cluster
; EBX = pointer to buffer
; EDX = # blocks to read in buffer
; ESI = # blocks to skip over
; output : if CARRY=0 ok EBX/EDX/ESI updated
; if CARRY=1 cluster out of range
; Note : if cluster=0 it's changed to read rootdir
;-----------------------------------------------------------
push eax ecx
mov [fat16_root], 0
cmp eax, [LAST_CLUSTER]
ja gdc_error ; too big cluster number, something is wrong
cmp eax, 2
jnb gdc_cluster
mov eax, [ROOT_CLUSTER]; if cluster < 2 then read rootdir
cmp [fs_type], 16
jne gdc_cluster
mov eax, [ROOT_START]
mov ecx, [ROOT_SECTORS]; Note: not cluster size
mov [fat16_root], 1 ; flag for fat16 rootdir
jmp gdc_read
gdc_cluster:
sub eax, 2
mov ecx, [SECTORS_PER_CLUSTER]
imul eax, ecx
add eax, [DATA_START]
gdc_read:
test esi, esi ; first wanted block
je gdcl1 ; yes, skip count is 0
dec esi
jmp gdcl2
gdcl1:
call hd_read
cmp [hd_error], 0
jne gdc_error
add ebx, 512 ; update pointer
dec edx
gdcl2:
test edx, edx ; is all read?
je out_of_read
inc eax ; next sector
dec ecx
jnz gdc_read
out_of_read:
pop ecx eax
clc
ret
gdc_error:
pop ecx eax
stc
ret
get_cluster_of_a_path:
;---------------------------------------------------------
; 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 ebx edx
mov eax, [ROOT_CLUSTER]
mov edx, ebx
search_end_of_path:
cmp byte [edx], 0
je found_end_of_path
inc edx; '/'
mov ebx, edx
call analyze_directory
jc directory_not_found
mov eax, [ebx+20-2] ; read the HIGH 16bit cluster field
mov ax, [ebx+26] ; read the LOW 16bit cluster field
and eax, [fatMASK]
add edx, 11 ; 8+3 (name+extension)
jmp search_end_of_path
found_end_of_path:
pop edx ebx
clc ; no errors
ret
directory_not_found:
pop edx ebx
stc ; errors occour
ret
bcd2bin:
;----------------------------------
; input : AL=BCD number (eg. 0x11)
; output : AH=0
; AL=decimal number (eg. 11)
;----------------------------------
xor ah, ah
shl ax, 4
shr al, 4
aad
ret
get_date_for_file:
;-----------------------------------------------------
; Get date from CMOS and pack day,month,year in AX
; DATE bits 0..4 : day of month 0..31
; 5..8 : month of year 1..12
; 9..15 : count of years from 1980
;-----------------------------------------------------
mov al, 0x7 ;day
out 0x70, al
in al, 0x71
call bcd2bin
ror eax, 5
mov al, 0x8 ;month
out 0x70, al
in al, 0x71
call bcd2bin
ror eax, 4
mov al, 0x9 ;year
out 0x70, al
in al, 0x71
call bcd2bin
add ax, 20 ;because CMOS return only the two last
;digit (eg. 2000 -> 00 , 2001 -> 01) and we
rol eax, 9 ;need the difference with 1980 (eg. 2001-1980)
ret
get_time_for_file:
;-----------------------------------------------------
; Get time from CMOS and pack hour,minute,second in AX
; TIME bits 0..4 : second (the low bit is lost)
; 5..10 : minute 0..59
; 11..15 : hour 0..23
;-----------------------------------------------------
mov al, 0x0 ;second
out 0x70, al
in al, 0x71
call bcd2bin
ror eax, 6
mov al, 0x2 ;minute
out 0x70, al
in al, 0x71
call bcd2bin
ror eax, 6
mov al, 0x4 ;hour
out 0x70, al
in al, 0x71
call bcd2bin
rol eax, 11
ret
set_current_time_for_entry:
;-----------------------------------------------------
; Set current time/date for file entry
; input : ebx = file entry pointer
;-----------------------------------------------------
push eax
call get_time_for_file; update files date/time
mov [ebx+22], ax
call get_date_for_file
mov [ebx+24], ax
pop eax
ret
add_disk_free_space:
;-----------------------------------------------------
; input : ecx = cluster count
; Note : negative = remove clusters from free space
; positive = add clusters to free space
;-----------------------------------------------------
test ecx, ecx ; no change
je add_dfs_no
cmp [fs_type], 32 ; free disk space only used by fat32
jne add_dfs_no
push eax ebx
mov eax, [ADR_FSINFO]
mov ebx, fsinfo_buffer
call hd_read
cmp [hd_error], 0
jne add_not_fs
cmp dword [ebx+0x1fc], 0xaa550000; check sector id
jne add_not_fs
add [ebx+0x1e8], ecx
push [fatStartScan]
pop dword [ebx+0x1ec]
call hd_write
; cmp [hd_error],0
; jne add_not_fs
add_not_fs:
pop ebx eax
add_dfs_no:
ret
file_read:
;--------------------------------------------------------------------------
; INPUT : user-register register-in-this meaning symbol-in-this
;
; EAX EDI system call to write /
; EBX EAX (PAR0) pointer to file-name PAR0
; EDX ECX (PAR1) pointer to buffer PAR1
; ECX EBX (PAR2) vt file blocks to read PAR2
; ESI EDX (PAR3) pointer to path PAR3
; EDI ESI vt first 512 block to read
; EDI if 0 - read root
;
; output : eax = 0 - ok
; 3 - unknown FS
; 5 - file not found
; 6 - end of file
; 9 - fat table corrupted
; 10 - access denied
; ebx = size of file/directory
;--------------------------------------------------------------------------
cmp [fs_type], 16
jz fat_ok_for_reading
cmp [fs_type], 32
jz fat_ok_for_reading
xor ebx, ebx
mov eax, ERROR_UNKNOWN_FS
mov [hd1_status], ebx
ret
fat_ok_for_reading:
; call reserve_hd1
pushad
mov ebx, edx
call get_cluster_of_a_path
jc file_to_read_not_found
test edi, edi ; read rootdir
jne no_read_root
xor eax, eax
call get_dir_size ; return rootdir size
cmp [hd_error], 0
jne file_access_denied
mov [file_size], eax
mov eax, [ROOT_CLUSTER]
jmp file_read_start
no_read_root:
mov ebx, PUSHAD_EAX ; file name
call analyze_directory
jc file_to_read_not_found
mov eax, [ebx+28] ; file size
test byte [ebx+11], 0x10; is it directory?
jz read_set_size ; no
mov eax, [ebx+20-2] ; FAT entry
mov ax, [ebx+26]
and eax, [fatMASK]
call get_dir_size
cmp [hd_error], 0
jne file_access_denied
read_set_size:
mov [file_size], eax
mov eax, [ebx+20-2] ; FAT entry
mov ax, [ebx+26]
and eax, [fatMASK]
file_read_start:
mov ebx, PUSHAD_ECX ; pointer to buffer
mov edx, PUSHAD_EBX ; file blocks to read
mov esi, PUSHAD_ESI ; first 512 block to read
file_read_new_cluster:
call get_data_cluster
jc file_read_eof ; end of file or cluster out of range
test edx, edx ; is all read?
je file_read_OK ; yes
call get_FAT ; get next cluster
cmp [hd_error], 0
jne file_access_denied
cmp eax, [fatRESERVED]; end of file
jnb file_read_eof
cmp eax, 2 ; incorrect fat chain
jnb file_read_new_cluster
popad
mov [hd1_status], 0
mov ebx, [file_size]
mov eax, ERROR_FAT_TABLE
ret
file_read_eof:
cmp [hd_error], 0
jne file_access_denied
popad
mov [hd1_status], 0
mov ebx, [file_size]
mov eax, ERROR_END_OF_FILE
ret
file_read_OK:
popad
mov [hd1_status], 0
mov ebx, [file_size]
xor eax, eax
ret
file_to_read_not_found:
cmp [hd_error], 0
jne file_access_denied
popad
mov [hd1_status], 0
xor ebx, ebx
mov eax, ERROR_FILE_NOT_FOUND
ret
file_access_denied:
popad
mov [hd1_status], 0
xor ebx, ebx
mov eax, ERROR_ACCESS_DENIED
ret
get_dir_size:
;-----------------------------------------------------
; input : eax = first cluster (0=rootdir)
; output : eax = directory size in bytes
;-----------------------------------------------------
push edx
xor edx, edx ; count of directory clusters
test eax, eax
jnz dir_size_next
mov eax, [ROOT_SECTORS]
shl eax, 9 ; fat16 rootdir size in bytes
cmp [fs_type], 16
je dir_size_ret
mov eax, [ROOT_CLUSTER]
dir_size_next:
cmp eax, 2 ; incorrect fat chain
jb dir_size_end
cmp eax, [fatRESERVED]; end of directory
ja dir_size_end
call get_FAT ; get next cluster
cmp [hd_error], 0
jne dir_size_ret
inc edx
jmp dir_size_next
dir_size_end:
imul eax, [SECTORS_PER_CLUSTER], 512; cluster size in bytes
imul eax, edx
dir_size_ret:
pop edx
ret
clear_cluster_chain:
;-----------------------------------------------------
; input : eax = first cluster
;-----------------------------------------------------
push eax ecx edx
xor ecx, ecx ; cluster count
clean_new_chain:
cmp eax, [LAST_CLUSTER]; end of file
ja delete_OK
cmp eax, 2 ; unfinished fat chain or zero length file
jb delete_OK
cmp eax, [ROOT_CLUSTER]; don't remove root cluster
jz delete_OK
xor edx, edx
call set_FAT ; clear fat entry
cmp [hd_error], 0
jne access_denied_01
inc ecx ; update cluster count
mov eax, edx ; old cluster
jmp clean_new_chain
delete_OK:
call add_disk_free_space; add clusters to free disk space
access_denied_01:
pop edx ecx eax
ret
get_hd_info:
;-----------------------------------------------------------
; output : eax = 0 - ok
; 3 - unknown FS
; 10 - access denied
; edx = cluster size in bytes
; ebx = total clusters on disk
; ecx = free clusters on disk
;-----------------------------------------------------------
cmp [fs_type], 16
jz info_fat_ok
cmp [fs_type], 32
jz info_fat_ok
xor edx, edx
xor ebx, ebx
xor ecx, ecx
mov eax, ERROR_UNKNOWN_FS
ret
info_fat_ok:
; call reserve_hd1
xor ecx, ecx ; count of free clusters
mov eax, 2
mov ebx, [LAST_CLUSTER]
info_cluster:
push eax
call get_FAT ; get cluster info
cmp [hd_error], 0
jne info_access_denied
test eax, eax ; is it free?
jnz info_used ; no
inc ecx
info_used:
pop eax
inc eax
cmp eax, ebx ; is above last cluster?
jbe info_cluster ; no. test next cluster
dec ebx ; cluster count
imul edx, [SECTORS_PER_CLUSTER], 512; cluster size in bytes
mov [hd1_status], 0
xor eax, eax
ret
info_access_denied:
add esp, 4
xor edx, edx
xor ebx, ebx
xor ecx, ecx
mov eax, ERROR_ACCESS_DENIED
ret
update_disk:
;-----------------------------------------------------------
; write changed fat and cache to disk
;-----------------------------------------------------------
cmp [fat_change], 0 ; is fat changed?
je upd_no_change
call write_fat_sector
cmp [hd_error], 0
jne update_disk_acces_denied
upd_no_change:
call write_cache
update_disk_acces_denied:
ret
; \begin{diamond}
hd_find_lfn:
; in: esi+ebp -> name
; out: CF=1 - file not found
; else CF=0 and edi->direntry, eax=sector
; destroys eax
push esi edi
push 0
push 0
push fat16_root_first
push fat16_root_next
mov eax, [ROOT_CLUSTER]
cmp [fs_type], 32
jz .fat32
.loop:
call fat_find_lfn
jc .notfound
cmp byte [esi], 0
jz .found
.continue:
test byte [edi+11], 10h
jz .notfound
and dword [esp+12], 0
mov eax, [edi+20-2]
mov ax, [edi+26] ; cluster
.fat32:
mov [esp+8], eax
mov dword [esp+4], fat_notroot_first
mov dword [esp], fat_notroot_next
jmp .loop
.notfound:
add esp, 16
pop edi esi
stc
ret
.found:
test ebp, ebp
jz @f
mov esi, ebp
xor ebp, ebp
jmp .continue
@@:
lea eax, [esp+8]
cmp dword [eax], 0
jz .root
call fat_get_sector
jmp .cmn
.root:
mov eax, [eax+4]
add eax, [ROOT_START]
.cmn:
add esp, 20 ; CF=0
pop esi
ret
;----------------------------------------------------------------
;
; fs_HdRead - LFN variant for reading hard disk
;
; 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_HdRead:
cmp [fs_type], 16
jz @f
cmp [fs_type], 32
jz @f
cmp [fs_type], 1
jz ntfs_HdRead
cmp [fs_type], 2
jz ext2_HdRead
or ebx, -1
mov eax, ERROR_UNKNOWN_FS
ret
@@:
push edi
cmp byte [esi], 0
jnz @f
.noaccess:
pop edi
.noaccess_2:
or ebx, -1
mov eax, ERROR_ACCESS_DENIED
ret
@@:
call hd_find_lfn
jnc .found
pop edi
cmp [hd_error], 0
jne .noaccess_2
or ebx, -1
mov eax, ERROR_FILE_NOT_FOUND
ret
.found:
test byte [edi+11], 0x10; do not allow read directories
jnz .noaccess
test ebx, ebx
jz .l1
cmp dword [ebx+4], 0
jz @f
xor ebx, ebx
.reteof:
mov eax, 6
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
@@:
mov eax, [edi+20-2]
mov ax, [edi+26]
; now eax=cluster, ebx=position, ecx=count, edx=buffer for data
.new_cluster:
jecxz .new_sector
test eax, eax
jz .eof
cmp eax, [fatRESERVED]
jae .eof
mov [cluster_tmp], eax
dec eax
dec eax
mov edi, [SECTORS_PER_CLUSTER]
imul eax, edi
add eax, [DATA_START]
.new_sector:
test ecx, ecx
jz .done
sub ebx, 512
jae .skip
add ebx, 512
jnz .force_buf
cmp ecx, 512
jb .force_buf
; we may read directly to given buffer
push ebx
mov ebx, edx
call hd_read
pop ebx
cmp [hd_error], 0
jne .noaccess_1
add edx, 512
sub ecx, 512
jmp .skip
.force_buf:
; we must read sector to temporary buffer and then copy it to destination
push eax ebx
mov ebx, buffer
call hd_read
mov eax, ebx
pop ebx
cmp [hd_error], 0
jne .noaccess_3
add eax, ebx
push ecx
add ecx, ebx
cmp ecx, 512
jbe @f
mov ecx, 512
@@:
sub ecx, ebx
mov ebx, edx
call memmove
add edx, ecx
sub [esp], ecx
pop ecx
pop eax
xor ebx, ebx
.skip:
inc eax
dec edi
jnz .new_sector
mov eax, [cluster_tmp]
call get_FAT
cmp [hd_error], 0
jne .noaccess_1
jmp .new_cluster
.noaccess_3:
pop eax
.noaccess_1:
pop eax
push 11
.done:
mov ebx, edx
pop eax edx ecx edi
sub ebx, edx
ret
.eof:
mov ebx, edx
pop eax edx ecx
sub ebx, edx
jmp .reteof
;----------------------------------------------------------------
;
; fs_HdReadFolder - LFN variant for reading hard disk folder
;
; 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_HdReadFolder:
cmp [fs_type], 1
jz ntfs_HdReadFolder
cmp [fs_type], 2
jz ext2_HdReadFolder
cmp [fs_type], 16
jz @f
cmp [fs_type], 32
jz @f
push ERROR_UNSUPPORTED_FS
pop eax
or ebx, -1
ret
@@:
mov eax, [ROOT_CLUSTER]
push edi
cmp byte [esi], 0
jz .doit
call hd_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:
mov eax, [edi+20-2]
mov ax, [edi+26] ; eax=cluster
.doit:
push esi ecx
push ebp
sub esp, 262*2 ; reserve space for LFN
mov ebp, esp
push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE name
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
.new_cluster:
mov [cluster_tmp], eax
test eax, eax
jnz @f
cmp [fs_type], 32
jz .notfound
mov eax, [ROOT_START]
push [ROOT_SECTORS]
push ebx
jmp .new_sector
@@:
dec eax
dec eax
imul eax, [SECTORS_PER_CLUSTER]
push [SECTORS_PER_CLUSTER]
add eax, [DATA_START]
push ebx
.new_sector:
mov ebx, buffer
mov edi, ebx
call hd_read
cmp [hd_error], 0
jnz .notfound2
add ebx, 512
push eax
.l1:
call fat_get_name
jc .l2
cmp byte [edi+11], 0xF
jnz .do_bdfe
add edi, 0x20
cmp edi, ebx
jb .do_bdfe
pop eax
inc eax
dec dword [esp+4]
jnz @f
mov eax, [cluster_tmp]
test eax, eax
jz .done
call get_FAT
cmp [hd_error], 0
jnz .notfound2
cmp eax, 2
jb .done
cmp eax, [fatRESERVED]
jae .done
push eax
mov eax, [SECTORS_PER_CLUSTER]
mov [esp+8], eax
pop eax
mov [cluster_tmp], eax
dec eax
dec eax
imul eax, [SECTORS_PER_CLUSTER]
add eax, [DATA_START]
@@:
mov ebx, buffer
mov edi, ebx
call hd_read
cmp [hd_error], 0
jnz .notfound2
add ebx, 512
push eax
.do_bdfe:
inc dword [edx+8] ; new file found
dec dword [esp+4]
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, ebx
jb .l1
pop eax
inc eax
dec dword [esp+4]
jnz .new_sector
mov eax, [cluster_tmp]
test eax, eax
jz .done
call get_FAT
cmp [hd_error], 0
jnz .notfound2
cmp eax, 2
jb .done
cmp eax, [fatRESERVED]
jae .done
push eax
mov eax, [SECTORS_PER_CLUSTER]
mov [esp+8], eax
pop eax
pop ebx
add esp, 4
jmp .new_cluster
.notfound2:
add esp, 8
.notfound:
add esp, 262*2+4
pop ebp ecx esi edi
mov eax, ERROR_FILE_NOT_FOUND
or ebx, -1
ret
.done:
add esp, 262*2+4+8
pop ebp
mov ebx, [edx+4]
xor eax, eax
dec ecx
js @f
mov al, ERROR_END_OF_FILE
@@:
pop ecx esi edi
ret
fat16_root_next:
cmp edi, buffer+0x200-0x20
jae fat16_root_next_sector
add edi, 0x20
ret ; CF=0
fat16_root_next_sector:
; read next sector
push [longname_sec2]
pop [longname_sec1]
push ecx
mov ecx, [eax+4]
push ecx
add ecx, [ROOT_START]
mov [longname_sec2], ecx
pop ecx
inc ecx
mov [eax+4], ecx
cmp ecx, [ROOT_SECTORS]
pop ecx
jae fat16_root_first.readerr
fat16_root_first:
mov eax, [eax+4]
add eax, [ROOT_START]
push ebx
mov edi, buffer
mov ebx, edi
call hd_read
pop ebx
cmp [hd_error], 0
jnz .readerr
ret ; CF=0
.readerr:
stc
ret
fat16_root_begin_write:
push edi eax
call fat16_root_first
pop eax edi
ret
fat16_root_end_write:
pusha
mov eax, [eax+4]
add eax, [ROOT_START]
mov ebx, buffer
call hd_write
popa
ret
fat16_root_next_write:
cmp edi, buffer+0x200
jae @f
ret
@@:
call fat16_root_end_write
jmp fat16_root_next_sector
fat16_root_extend_dir:
stc
ret
fat_notroot_next:
cmp edi, buffer+0x200-0x20
jae fat_notroot_next_sector
add edi, 0x20
ret ; CF=0
fat_notroot_next_sector:
push [longname_sec2]
pop [longname_sec1]
push eax
call fat_get_sector
mov [longname_sec2], eax
pop eax
push ecx
mov ecx, [eax+4]
inc ecx
cmp ecx, [SECTORS_PER_CLUSTER]
jae fat_notroot_next_cluster
mov [eax+4], ecx
jmp @f
fat_notroot_next_cluster:
push eax
mov eax, [eax]
call get_FAT
mov ecx, eax
pop eax
cmp [hd_error], 0
jnz fat_notroot_next_err
cmp ecx, [fatRESERVED]
jae fat_notroot_next_err
mov [eax], ecx
and dword [eax+4], 0
@@:
pop ecx
fat_notroot_first:
call fat_get_sector
push ebx
mov edi, buffer
mov ebx, edi
call hd_read
pop ebx
cmp [hd_error], 0
jnz @f
ret ; CF=0
fat_notroot_next_err:
pop ecx
@@:
stc
ret
fat_notroot_begin_write:
push eax edi
call fat_notroot_first
pop edi eax
ret
fat_notroot_end_write:
call fat_get_sector
push ebx
mov ebx, buffer
call hd_write
pop ebx
ret
fat_notroot_next_write:
cmp edi, buffer+0x200
jae @f
ret
@@:
push eax
call fat_notroot_end_write
pop eax
jmp fat_notroot_next_sector
fat_notroot_extend_dir:
push eax
call get_free_FAT
jnc .found
pop eax
ret ; CF=1
.found:
push edx
mov edx, [fatEND]
call set_FAT
mov edx, eax
mov eax, [esp+4]
mov eax, [eax]
push edx
call set_FAT
pop edx
cmp [hd_error], 0
jz @f
pop edx
pop eax
stc
ret
@@:
push ecx
or ecx, -1
call add_disk_free_space
; zero new cluster
mov ecx, 512/4
mov edi, buffer
push edi
xor eax, eax
rep stosd
pop edi
pop ecx
mov eax, [esp+4]
mov [eax], edx
and dword [eax+4], 0
pop edx
mov eax, [eax]
dec eax
dec eax
push ebx ecx
mov ecx, [SECTORS_PER_CLUSTER]
imul eax, ecx
add eax, [DATA_START]
mov ebx, edi
@@:
call hd_write
inc eax
loop @b
pop ecx ebx eax
clc
ret
fat_get_sector:
push ecx
mov ecx, [eax]
dec ecx
dec ecx
imul ecx, [SECTORS_PER_CLUSTER]
add ecx, [DATA_START]
add ecx, [eax+4]
mov eax, ecx
pop ecx
ret
;----------------------------------------------------------------
;
; fs_HdRewrite - LFN variant for writing hard disk
;
; 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
;
;--------------------------------------------------------------
fshrad:
mov eax, ERROR_ACCESS_DENIED
xor ebx, ebx
ret
fshrfs:
mov eax, ERROR_UNKNOWN_FS
xor ebx, ebx
ret
fs_HdCreateFolder:
mov al, 1
jmp fs_HdRewrite.common
fs_HdRewrite:
xor eax, eax
.common:
cmp [fs_type], 1
jz ntfs_HdRewrite
cmp [fs_type], 2
jz ext2_HdRewrite
cmp [fs_type], 16
jz @f
cmp [fs_type], 32
jnz fshrfs
@@:
cmp byte [esi], 0
jz fshrad
pushad
xor edi, edi
push esi
test ebp, ebp
jz @f
mov esi, ebp
@@:
lodsb
test al, al
jz @f
cmp al, '/'
jnz @b
lea edi, [esi-1]
jmp @b
@@:
pop esi
test edi, edi
jnz .noroot
test ebp, ebp
jnz .hasebp
mov ebp, [ROOT_CLUSTER]
cmp [fs_type], 32
jz .pushnotroot
push fat16_root_extend_dir
push fat16_root_end_write
push fat16_root_next_write
push fat16_root_begin_write
xor ebp, ebp
push ebp
push ebp
push fat16_root_first
push fat16_root_next
jmp .common1
.hasebp:
mov eax, ERROR_ACCESS_DENIED
cmp byte [ebp], 0
jz .ret1
push ebp
xor ebp, ebp
call hd_find_lfn
pop esi
jc .notfound0
jmp .common0
.noroot:
mov eax, ERROR_ACCESS_DENIED
cmp byte [edi+1], 0
jz .ret1
; check existence
mov byte [edi], 0
push edi
call hd_find_lfn
pop esi
mov byte [esi], '/'
jnc @f
.notfound0:
mov eax, ERROR_FILE_NOT_FOUND
.ret1:
mov [esp+28], eax
popad
xor ebx, ebx
ret
@@:
inc esi
.common0:
test byte [edi+11], 0x10 ; must be directory
mov eax, ERROR_ACCESS_DENIED
jz .ret1
mov ebp, [edi+20-2]
mov bp, [edi+26] ; ebp=cluster
mov eax, ERROR_FAT_TABLE
cmp ebp, 2
jb .ret1
.pushnotroot:
push fat_notroot_extend_dir
push fat_notroot_end_write
push fat_notroot_next_write
push fat_notroot_begin_write
push 0
push ebp
push fat_notroot_first
push fat_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, 32
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+32+28], 0
jz @f
add esp, 32
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
xor ecx, ecx
mov eax, [edi+20-2]
mov ax, [edi+26]
mov word [edi+20], cx
mov word [edi+26], cx
test eax, eax
jz .done1
@@:
cmp eax, [fatRESERVED]
jae .done1
push edx
xor edx, edx
call set_FAT
mov eax, edx
pop edx
inc ecx
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, 32
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
and dword [eax+4], 0
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+32
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
push -1
; find <eax> successive entries in directory
xor ecx, ecx
push eax
lea eax, [esp+16+8+12+8]
mov [eax], ebp
and dword [eax+4], 0
call dword [eax-4]
pop eax
jnc .scan_dir
.fsfrfe3:
add esp, 12+8+12+32
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+16+8+12+8]
call dword [eax-8]
pop eax
jnc .scan_dir
cmp [hd_error], 0
jnz .fsfrfe3
push eax
lea eax, [esp+16+8+12+8]
call dword [eax+20] ; extend directory
pop eax
jnc .scan_dir
add esp, 12+8+12+32
popad
mov eax, ERROR_DISK_FULL
xor ebx, ebx
ret
.free:
test ecx, ecx
jnz @f
mov [esp], edi
mov ecx, [esp+12+8+12+8]
mov [esp+4], ecx
mov ecx, [esp+12+8+12+12]
mov [esp+8], ecx
xor ecx, ecx
@@:
inc ecx
cmp ecx, eax
jb .scan_cont
; found!
; calculate name checksum
push esi ecx
mov esi, [esp+8+12]
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+12]
pop dword [esp+8+12+12]
; 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+8] ; 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+12] ; next write
xor eax, eax
loop .writelfn
pop eax
pop esi
; lea eax, [esp+8+12+8]
; call dword [eax+16] ; 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
xor ecx, ecx
mov word [edi+20], cx ; high word of cluster
mov word [edi+26], cx ; low word of cluster - to be filled
mov dword [edi+28], ecx ; file size - to be filled
cmp byte [esp+32+28], cl
jz .doit
; create directory
mov byte [edi+11], 10h ; attributes: folder
mov edx, edi
lea eax, [esp+8]
call dword [eax+16] ; flush directory
push ecx
mov ecx, [SECTORS_PER_CLUSTER]
shl ecx, 9
jmp .doit2
.doit:
lea eax, [esp+8]
call dword [eax+16] ; flush directory
push ecx
mov ecx, [esp+4+32+24]
.doit2:
push ecx
push edi
mov esi, edx
test ecx, ecx
jz .done
call get_free_FAT
jc .diskfull
push eax
mov [edi+26], ax
shr eax, 16
mov [edi+20], ax
lea eax, [esp+16+8]
call dword [eax+16] ; flush directory
pop eax
push edx
mov edx, [fatEND]
call set_FAT
pop edx
.write_cluster:
push eax
dec eax
dec eax
mov ebp, [SECTORS_PER_CLUSTER]
imul eax, ebp
add eax, [DATA_START]
; write data
.write_sector:
cmp byte [esp+16+32+28], 0
jnz .writedir
mov ecx, 512
cmp dword [esp+8], ecx
jb .writeshort
; we can write directly from given buffer
mov ebx, esi
add esi, ecx
jmp .writecommon
.writeshort:
mov ecx, [esp+8]
push ecx
mov edi, buffer
mov ebx, edi
rep movsb
.writedircont:
mov ecx, buffer+0x200
sub ecx, edi
push eax
xor eax, eax
rep stosb
pop eax
pop ecx
.writecommon:
call hd_write
cmp [hd_error], 0
jnz .writeerr
inc eax
sub dword [esp+8], ecx
jz .writedone
dec ebp
jnz .write_sector
; allocate new cluster
pop eax
mov ecx, eax
call get_free_FAT
jc .diskfull
push edx
mov edx, [fatEND]
call set_FAT
xchg eax, ecx
mov edx, ecx
call set_FAT
pop edx
xchg eax, ecx
jmp .write_cluster
.diskfull:
mov eax, ERROR_DISK_FULL
jmp .ret
.writeerr:
pop eax
sub esi, ecx
mov eax, 11
jmp .ret
.writedone:
pop eax
.done:
xor eax, eax
.ret:
pop edi ecx
mov ebx, esi
sub ebx, edx
pop ebp
mov [esp+32+28], eax
lea eax, [esp+8]
call dword [eax+8]
mov [edi+28], ebx
call dword [eax+16]
mov [esp+32+16], ebx
lea eax, [ebx+511]
shr eax, 9
mov ecx, [SECTORS_PER_CLUSTER]
lea eax, [eax+ecx-1]
xor edx, edx
div ecx
mov ecx, ebp
sub ecx, eax
call add_disk_free_space
add esp, 32
call update_disk
popad
ret
.writedir:
push 512
mov edi, buffer
mov ebx, edi
mov ecx, [SECTORS_PER_CLUSTER]
shl ecx, 9
cmp ecx, [esp+12]
jnz .writedircont
dec dword [esp+16]
push esi
mov ecx, 32/4
rep movsd
pop esi
mov dword [edi-32], '. '
mov dword [edi-32+4], ' '
mov dword [edi-32+8], ' '
mov byte [edi-32+11], 10h
push esi
mov ecx, 32/4
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+20+8]
cmp ecx, [ROOT_CLUSTER]
jnz @f
xor ecx, ecx
@@:
mov word [edi-32+26], cx
shr ecx, 16
mov [edi-32+20], cx
jmp .writedircont
;----------------------------------------------------------------
;
; fs_HdWrite - LFN variant for writing to hard disk
;
; 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
;
;--------------------------------------------------------------
fs_HdWrite.access_denied:
push ERROR_ACCESS_DENIED
fs_HdWrite.ret0:
pop eax
xor ebx, ebx
ret
fs_HdWrite.ret11:
push 11
jmp fs_HdWrite.ret0
fs_HdWrite:
cmp [fs_type], 1
jz ntfs_HdWrite
cmp [fs_type], 2
jz ext2_HdWrite
cmp [fs_type], 16
jz @f
cmp [fs_type], 32
jz @f
push ERROR_UNKNOWN_FS
jmp .ret0
@@:
cmp byte [esi], 0
jz .access_denied
pushad
call hd_find_lfn
pushfd
cmp [hd_error], 0
jz @f
popfd
popad
push 11
jmp .ret0
@@:
popfd
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 sector
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 hd_extend_file
jnc .length_ok
mov [esp+4], eax
; hd_extend_file can return three error codes: FAT table error, device error or disk full.
; First two cases are fatal errors, in third 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:
call update_disk
cmp [hd_error], 0
jz @f
mov byte [esp+4], 11
@@:
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:
mov esi, [edi+28]
mov eax, [edi+20-2]
mov ax, [edi+26]
mov edi, eax ; edi=current cluster
xor ebp, ebp ; ebp=current sector in cluster
; save directory
mov eax, [esp+8]
push ebx
mov ebx, buffer
call hd_write
pop ebx
cmp [hd_error], 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
.write_loop:
; skip unmodified sectors
cmp dword [esp], 0x200
jb .modify
sub ebx, 0x200
jae .skip
add ebx, 0x200
.modify:
; 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
@@:
; get current sector number
mov eax, edi
dec eax
dec eax
imul eax, [SECTORS_PER_CLUSTER]
add eax, [DATA_START]
add eax, ebp
; 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
push ebx
mov ebx, buffer
call hd_read
pop ebx
cmp [hd_error], 0
jz @f
.device_err2:
pop ecx
jmp .device_err
@@:
.noread:
; zero uninitialized data if file was extended (because hd_extend_file does not this)
push eax ecx edi
xor eax, eax
mov ecx, 0x200
sub ecx, [esp+4+12]
jbe @f
mov edi, buffer
add edi, [esp+4+12]
rep stosb
@@:
; zero uninitialized data in the last sector
mov ecx, 0x200
sub ecx, esi
jbe @f
mov edi, buffer
add edi, esi
rep stosb
@@:
pop edi ecx
; copy new data
mov eax, edx
neg ebx
jecxz @f
add ebx, buffer+0x200
call memmove
xor ebx, ebx
@@:
pop eax
; save sector
push ebx
mov ebx, buffer
call hd_write
pop ebx
cmp [hd_error], 0
jnz .device_err2
add edx, ecx
sub [esp], ecx
pop ecx
jz .ret
.skip:
; next sector
inc ebp
cmp ebp, [SECTORS_PER_CLUSTER]
jb @f
xor ebp, ebp
mov eax, edi
call get_FAT
mov edi, eax
cmp [hd_error], 0
jnz .device_err
@@:
sub esi, 0x200
jae @f
xor esi, esi
@@:
sub dword [esp], 0x200
jae @f
and dword [esp], 0
@@:
jmp .write_loop
hd_extend_file.zero_size:
xor eax, eax
jmp hd_extend_file.start_extend
; extends file on hd 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 or 11)
hd_extend_file:
push ebp
mov ebp, [SECTORS_PER_CLUSTER]
imul ebp, [BYTES_PER_SECTOR]
push ecx
; find the last cluster of file
mov eax, [edi+20-2]
mov ax, [edi+26]
mov ecx, [edi+28]
jecxz .zero_size
.last_loop:
sub ecx, ebp
jbe .last_found
call get_FAT
cmp [hd_error], 0
jz @f
.device_err:
pop ecx
.device_err2:
pop ebp
push 11
.ret_err:
pop eax
stc
ret
@@:
cmp eax, 2
jb .fat_err
cmp eax, [fatRESERVED]
jb .last_loop
.fat_err:
pop ecx ebp
push ERROR_FAT_TABLE
jmp .ret_err
.last_found:
push eax
call get_FAT
cmp [hd_error], 0
jz @f
pop eax
jmp .device_err
@@:
cmp eax, [fatRESERVED]
pop eax
jb .fat_err
; set length to full number of clusters
sub [edi+28], ecx
.start_extend:
pop ecx
; now do extend
push edx
mov edx, 2 ; start scan from cluster 2
.extend_loop:
cmp [edi+28], ecx
jae .extend_done
; add new cluster
push eax
call get_free_FAT
jc .disk_full
mov edx, [fatEND]
call set_FAT
mov edx, eax
pop eax
test eax, eax
jz .first_cluster
push edx
call set_FAT
pop edx
jmp @f
.first_cluster:
ror edx, 16
mov [edi+20], dx
ror edx, 16
mov [edi+26], dx
@@:
push ecx
mov ecx, -1
call add_disk_free_space
pop ecx
mov eax, edx
cmp [hd_error], 0
jnz .device_err3
add [edi+28], ebp
jmp .extend_loop
.extend_done:
mov [edi+28], ecx
pop edx ebp
xor eax, eax ; CF=0
ret
.device_err3:
pop edx
jmp .device_err2
.disk_full:
pop eax edx ebp
push ERROR_DISK_FULL
pop eax
cmp [hd_error], 0
jz @f
mov al, 11
@@:
stc
ret
;----------------------------------------------------------------
;
; fs_HdSetFileEnd - set end of file on hard disk
;
; 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_HdSetFileEnd:
cmp [fs_type], 1
jz ntfs_HdSetFileEnd
cmp [fs_type], 2
jz ext2_HdSetFileEnd
cmp [fs_type], 16
jz @f
cmp [fs_type], 32
jz @f
push ERROR_UNKNOWN_FS
.ret:
pop eax
ret
@@:
cmp byte [esi], 0
jnz @f
.access_denied:
push ERROR_ACCESS_DENIED
jmp .ret
@@:
push edi
call hd_find_lfn
pushfd
cmp [hd_error], 0
jz @f
popfd
push 11
jmp .ret
@@:
popfd
jnc @f
pop edi
push ERROR_FILE_NOT_FOUND
jmp .ret
@@:
; 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 ; save directory sector
; set file modification date/time to current
call fat_update_datetime
mov eax, [ebx]
cmp eax, [edi+28]
jb .truncate
ja .expand
pop eax
mov ebx, buffer
call hd_write
pop edi
xor eax, eax
cmp [hd_error], 0
jz @f
mov al, 11
@@:
ret
.expand:
push ebx ebp ecx
push dword [edi+28] ; save old size
mov ecx, eax
call hd_extend_file
push eax ; return code
jnc .expand_ok
cmp al, ERROR_DISK_FULL
jz .disk_full
.pop_ret:
call update_disk
pop eax ecx ebp ebx ecx edi edi
ret
.expand_ok:
.disk_full:
; save directory
mov eax, [edi+28]
xchg eax, [esp+20]
mov ebx, buffer
call hd_write
mov eax, [edi+20-2]
mov ax, [edi+26]
mov edi, eax
cmp [hd_error], 0
jz @f
.pop_ret11:
mov byte [esp], 11
jmp .pop_ret
@@:
; now zero new data
xor ebp, ebp
; edi=current cluster, ebp=sector in cluster
; [esp+20]=new size, [esp+4]=old size, [esp]=return code
.zero_loop:
sub dword [esp+4], 0x200
jae .next_cluster
lea eax, [edi-2]
imul eax, [SECTORS_PER_CLUSTER]
add eax, [DATA_START]
add eax, ebp
cmp dword [esp+4], -0x200
jz .noread
mov ebx, buffer
call hd_read
cmp [hd_error], 0
jnz .err_next
.noread:
mov ecx, [esp+4]
neg ecx
push edi
mov edi, buffer+0x200
add edi, [esp+8]
push eax
xor eax, eax
mov [esp+12], eax
rep stosb
pop eax
pop edi
call hd_write
cmp [hd_error], 0
jz .next_cluster
.err_next:
mov byte [esp], 11
.next_cluster:
sub dword [esp+20], 0x200
jbe .pop_ret
inc ebp
cmp ebp, [SECTORS_PER_CLUSTER]
jb .zero_loop
xor ebp, ebp
mov eax, edi
call get_FAT
mov edi, eax
cmp [hd_error], 0
jnz .pop_ret11
jmp .zero_loop
.truncate:
mov [edi+28], eax
push ecx
mov ecx, [edi+20-2]
mov cx, [edi+26]
push eax
test eax, eax
jz .zero_size
; find new last cluster
@@:
mov eax, [SECTORS_PER_CLUSTER]
shl eax, 9
sub [esp], eax
jbe @f
mov eax, ecx
call get_FAT
mov ecx, eax
cmp [hd_error], 0
jz @b
.device_err3:
pop eax ecx eax edi
push 11
pop eax
ret
@@:
; we will zero data at the end of last sector - remember it
push ecx
; terminate FAT chain
push edx
mov eax, ecx
mov edx, [fatEND]
call set_FAT
mov eax, edx
pop edx
cmp [hd_error], 0
jz @f
.device_err4:
pop ecx
jmp .device_err3
.zero_size:
and word [edi+20], 0
and word [edi+26], 0
push 0
mov eax, ecx
@@:
; delete FAT chain
call clear_cluster_chain
cmp [hd_error], 0
jnz .device_err4
; save directory
mov eax, [esp+12]
push ebx
mov ebx, buffer
call hd_write
pop ebx
cmp [hd_error], 0
jnz .device_err4
; zero last sector, ignore errors
pop ecx
pop eax
dec ecx
imul ecx, [SECTORS_PER_CLUSTER]
add ecx, [DATA_START]
push eax
sar eax, 9
add ecx, eax
pop eax
and eax, 0x1FF
jz .truncate_done
push ebx eax
mov eax, ecx
mov ebx, buffer
call hd_read
pop eax
lea edi, [buffer+eax]
push ecx
mov ecx, 0x200
sub ecx, eax
xor eax, eax
rep stosb
pop eax
call hd_write
pop ebx
.truncate_done:
pop ecx eax edi
call update_disk
xor eax, eax
cmp [hd_error], 0
jz @f
mov al, 11
@@:
ret
fs_HdGetFileInfo:
cmp [fs_type], 1
jz ntfs_HdGetFileInfo
cmp [fs_type], 2
jz ext2_HdGetFileInfo
cmp [fs_type], 16
jz @f
cmp [fs_type], 32
jz @f
mov eax, ERROR_UNKNOWN_FS
ret
@@:
cmp byte [esi], 0
jnz @f
mov eax, 2
ret
@@:
push edi
call hd_find_lfn
pushfd
cmp [hd_error], 0
jz @f
popfd
pop edi
mov eax, 11
ret
@@:
popfd
jmp fs_GetFileInfo_finish
fs_HdSetFileInfo:
cmp [fs_type], 1
jz ntfs_HdSetFileInfo
cmp [fs_type], 2
jz ext2_HdSetFileInfo
cmp [fs_type], 16
jz @f
cmp [fs_type], 32
jz @f
mov eax, ERROR_UNKNOWN_FS
ret
@@:
cmp byte [esi], 0
jnz @f
mov eax, 2
ret
@@:
push edi
call hd_find_lfn
pushfd
cmp [hd_error], 0
jz @f
popfd
pop edi
mov eax, 11
ret
@@:
popfd
jnc @f
pop edi
mov eax, ERROR_FILE_NOT_FOUND
ret
@@:
push eax
call bdfe_to_fat_entry
pop eax
mov ebx, buffer
call hd_write
call update_disk
pop edi
xor eax, eax
ret
;----------------------------------------------------------------
;
; fs_HdDelete - delete file or empty folder from hard disk
;
; esi points to filename
;
; ret eax = 0 ok or other = errormsg
;
;--------------------------------------------------------------
fs_HdDelete:
cmp [fs_type], 1
jz ntfs_HdDelete
cmp [fs_type], 2
jz ext2_HdDelete
cmp [fs_type], 16
jz @f
cmp [fs_type], 32
jz @f
push ERROR_UNKNOWN_FS
.pop_ret:
pop eax
ret
@@:
cmp byte [esi], 0
jnz @f
; cannot delete root!
.access_denied:
push ERROR_ACCESS_DENIED
jmp .pop_ret
@@:
and [longname_sec1], 0
and [longname_sec2], 0
push edi
call hd_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!
pushad
mov ebp, [edi+20-2]
mov bp, [edi+26]
xor ecx, ecx
lea eax, [ebp-2]
imul eax, [SECTORS_PER_CLUSTER]
add eax, [DATA_START]
mov ebx, buffer
call hd_read
cmp [hd_error], 0
jnz .err1
add ebx, 2*0x20
.checkempty:
cmp byte [ebx], 0
jz .empty
cmp byte [ebx], 0xE5
jnz .notempty
add ebx, 0x20
cmp ebx, buffer+0x200
jb .checkempty
inc ecx
cmp ecx, [SECTORS_PER_CLUSTER]
jb @f
mov eax, ebp
call get_FAT
cmp [hd_error], 0
jnz .err1
mov ebp, eax
xor ecx, ecx
@@:
lea eax, [ebp-2]
imul eax, [SECTORS_PER_CLUSTER]
add eax, [DATA_START]
add eax, ecx
mov ebx, buffer
call hd_read
cmp [hd_error], 0
jz .checkempty
.err1:
popad
.err2:
pop edi
push 11
pop eax
ret
.notempty:
popad
.access_denied2:
pop edi
push ERROR_ACCESS_DENIED
pop eax
ret
.empty:
popad
push ebx
mov ebx, buffer
call hd_read
pop ebx
cmp [hd_error], 0
jnz .err2
.dodel:
push eax
mov eax, [edi+20-2]
mov ax, [edi+26]
xchg eax, [esp]
; delete folder entry
mov byte [edi], 0xE5
; delete LFN (if present)
.lfndel:
cmp edi, buffer
ja @f
cmp [longname_sec2], 0
jz .lfndone
push [longname_sec2]
push [longname_sec1]
pop [longname_sec2]
and [longname_sec1], 0
push ebx
mov ebx, buffer
call hd_write
mov eax, [esp+4]
call hd_read
pop ebx
pop eax
mov edi, buffer+0x200
@@:
sub edi, 0x20
cmp byte [edi], 0xE5
jz .lfndone
cmp byte [edi+11], 0xF
jnz .lfndone
mov byte [edi], 0xE5
jmp .lfndel
.lfndone:
push ebx
mov ebx, buffer
call hd_write
pop ebx
; delete FAT chain
pop eax
call clear_cluster_chain
call update_disk
pop edi
xor eax, eax
cmp [hd_error], 0
jz @f
mov al, 11
@@:
ret
; \end{diamond}
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