2828 lines
76 KiB
PHP
2828 lines
76 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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||
;; ;;
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||
;; FAT32.INC ;;
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;; ;;
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;; FAT16/32 functions for MenuetOS ;;
|
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;; ;;
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;; Copyright 2002 Paolo Minazzi, paolo.minazzi@inwind.it ;;
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;; ;;
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;; See file COPYING for details ;;
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||
;; ;;
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;; 15.01.2005 get file size/attr/date, file_append - ATV ;;
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||
;; 04.12.2004 skip volume label, file delete bug fixed - ATV ;;
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||
;; 29.11.2004 get_free_FAT changed, append dir bug fixed - ATV ;;
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||
;; 23.11.2004 don't allow overwrite dir with file - ATV ;;
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;; 18.11.2004 get_disk_info and more error codes - ATV ;;
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;; 17.11.2004 set_FAT/get_FAT and disk cache rewritten - ATV ;;
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;; 10.11.2004 removedir clear whole directory structure - ATV ;;
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;; 08.11.2004 rename - ATV ;;
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;; 30.10.2004 file_read return also dirsize in bytes - ATV ;;
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;; 20.10.2004 Makedir/Removedir - ATV ;;
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;; 14.10.2004 Partition chain/Fat16 - ATV (thanks drh3xx) ;;
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;; 06.9.2004 Fix free space by Mario79 added - MH ;;
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;; 24.5.2004 Write back buffer for File_write -VT ;;
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;; 20.5.2004 File_read function to work with syscall 58 - VT ;;
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;; 30.3.2004 Error parameters at function return - VT ;;
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;; 01.5.2002 Bugfix in device write - VT ;;
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||
;; 20.5.2002 Hd status check - VT ;;
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;; 29.6.2002 Improved fat32 verification - VT ;;
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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||
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cache_max equ 1919 ; max. is 1919*512+0x610000=0x6ffe00
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||
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ERROR_DISK_BASE equ 1
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||
ERROR_UNSUPPORTED_FS equ 2
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||
ERROR_UNKNOWN_FS equ 3
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||
ERROR_PARTITION equ 4
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||
ERROR_FILE_NOT_FOUND equ 5
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||
ERROR_END_OF_FILE equ 6
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ERROR_MEMORY_POINTER equ 7
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||
ERROR_DISK_FULL equ 8
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||
ERROR_FAT_TABLE equ 9
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||
ERROR_ACCESS_DENIED equ 10
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||
|
||
PUSHAD_EAX equ [esp+28]
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||
PUSHAD_ECX equ [esp+24]
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||
PUSHAD_EDX equ [esp+20]
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||
PUSHAD_EBX equ [esp+16]
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||
PUSHAD_EBP equ [esp+8]
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||
PUSHAD_ESI equ [esp+4]
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||
PUSHAD_EDI equ [esp+0]
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||
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align 4
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;******************************************************
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||
; Please do not change this place - variables in text
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||
; Mario79
|
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; START place
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||
;******************************************************
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||
PARTITION_START dd 0x3f
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||
PARTITION_END dd 0
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SECTORS_PER_FAT dd 0x1f3a
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NUMBER_OF_FATS dd 0x2
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SECTORS_PER_CLUSTER dd 0x8
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BYTES_PER_SECTOR dd 0x200 ; Note: if BPS <> 512 need lots of changes
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ROOT_CLUSTER dd 2 ; first rootdir cluster
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FAT_START dd 0 ; start of fat table
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ROOT_START dd 0 ; start of rootdir (only fat16)
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ROOT_SECTORS dd 0 ; count of rootdir sectors (only fat16)
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DATA_START dd 0 ; start of data area (=first cluster 2)
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LAST_CLUSTER dd 0 ; last availabe cluster
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ADR_FSINFO dd 0 ; used only by fat32
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||
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fatRESERVED dd 0x0FFFFFF6
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fatBAD dd 0x0FFFFFF7
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fatEND dd 0x0FFFFFF8
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fatMASK dd 0x0FFFFFFF
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fat_type db 0 ; 0=none, 16=fat16, 32=fat32
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;***************************************************************************
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||
; End place
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||
; Mario79
|
||
;***************************************************************************
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cluster dd 0 ; used by file_write,makedir,append
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partition_count dd 0 ; partitions found by set_FAT32_variables
|
||
longname_sec1 dd 0 ; used by analyze_directory to save 2 previous
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||
longname_sec2 dd 0 ; directory sectors for delete long filename
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||
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||
hd_error dd 0 ; set by wait_for_sector_buffer
|
||
hd_setup dd 0
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hd_wait_timeout dd 0
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||
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cluster_tmp dd 0 ; used by analyze_directory
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||
; and analyze_directory_to_write
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||
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file_size dd 0 ; used by file_read
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sector_tmp dd 0 ; used by rename,append,file_write
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entry_pos dd 0 ; used by rename,append,file_write
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||
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old_filesize dd 0 ; used by append
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new_filepos dd 0 ; used by append
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bytes2write dd 0 ; used by append
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cache_search_start dd 0 ; used by find_empty_slot
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||
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fat_in_cache dd -1
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fat_cache: times 512 db 0
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uglobal
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Sector512: ; label for dev_hdcd.inc
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||
buffer: times 512 db 0
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||
deltree_buffer: times 512 db 0
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||
endg
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iglobal
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NewDirEntry1 db ". ",0x10
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times 20 db 0
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NewDirEntry2 db ".. ",0x10
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times 20 db 0
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endg
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||
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uglobal
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||
dir_entry: times 32 db 0
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||
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startpath: times 255 db 0
|
||
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||
fat16_root db 0 ; flag for fat16 rootdir
|
||
f_del db 0 ; 1=overwrite fat entry
|
||
fat_change db 0 ; 1=fat has changed
|
||
|
||
endg
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||
|
||
iglobal
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||
partition_types: ; list of fat16/32 partitions
|
||
db 0x04 ; DOS: fat16 <32M
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||
db 0x06 ; DOS: fat16 >32M
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||
db 0x0b ; WIN95: fat32
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||
db 0x0c ; WIN95: fat32, LBA-mapped
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||
db 0x0e ; WIN95: fat16, LBA-mapped
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||
db 0x14 ; Hidden DOS: fat16 <32M
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||
db 0x16 ; Hidden DOS: fat16 >32M
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||
db 0x1b ; Hidden WIN95: fat32
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||
db 0x1c ; Hidden WIN95: fat32, LBA-mapped
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||
db 0x1e ; Hidden WIN95: fat16, LBA-mapped
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||
db 0xc4 ; DRDOS/secured: fat16 <32M
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||
db 0xc6 ; DRDOS/secured: fat16 >32M
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||
db 0xcb ; DRDOS/secured: fat32
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||
db 0xcc ; DRDOS/secured: fat32, LBA-mapped
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||
db 0xce ; DRDOS/secured: fat16, LBA-mapped
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||
db 0xd4 ; Old Multiuser DOS secured: fat16 <32M
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||
db 0xd6 ; Old Multiuser DOS secured: fat16 >32M
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partition_types_end:
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||
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||
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extended_types: ; list of extended partitions
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||
db 0x05 ; DOS: extended partition
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||
db 0x0f ; WIN95: extended partition, LBA-mapped
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||
db 0xc5 ; DRDOS/secured: extended partition
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db 0xd5 ; Old Multiuser DOS secured: extended partition
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extended_types_end:
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||
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endg
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reserve_hd1:
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||
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||
cli
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cmp [hd1_status],0
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||
je reserve_ok1
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||
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sti
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||
call change_task
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||
jmp reserve_hd1
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||
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reserve_ok1:
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||
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push eax
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mov eax,[0x3000]
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||
shl eax,5
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||
mov eax,[eax+0x3000+4]
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mov [hd1_status],eax
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||
pop eax
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||
sti
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||
ret
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||
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||
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clear_hd_cache:
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||
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||
push eax ecx edi
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||
mov edi,0x600000
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||
mov ecx,16384
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||
xor eax,eax
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||
cld
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||
rep stosd ; clear hd cache with 0
|
||
mov [cache_search_start],eax
|
||
mov [fat_in_cache],-1
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||
mov [fat_change],0
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||
pop edi ecx eax
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||
ret
|
||
|
||
problem_partition db 0 ; used for partitions search
|
||
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||
; Partition chain used:
|
||
; MBR ; PARTITION2 ; PARTITION3 ; PARTITION4
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||
;==========================================================
|
||
; fat16/32 +-- fat16/32 +-- fat16/32 +-- fat16/32 +--
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||
; extended --+ extended --+ extended --+ extended --+
|
||
; 0 0 0 0
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||
; 0 0 0 0
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||
; Notes:
|
||
; - extended partition need to be in second entry on table
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||
; - it will skip over removed partitions
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||
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||
set_FAT32_variables:
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mov [0xfe10],dword 0 ; entries in hd cache
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||
mov [problem_partition],0
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||
call reserve_hd1
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||
call clear_hd_cache
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cmp dword [hdpos],0
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||
je problem_hd
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||
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pushad
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xor ecx,ecx ; partition count
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mov edx,-1 ; flag for partition
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xor eax,eax ; read MBR
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xor ebp,ebp ; extended partition start
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new_partition:
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test ebp,ebp ; is there extended partition?
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jnz extended_already_set ; yes
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xchg ebp,eax ; no. set it now
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||
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extended_already_set:
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||
add eax,ebp ; mbr=mbr+0, ext_part=ext_start+relat_start
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||
mov ebx,buffer
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call hd_read
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cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
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jnz end_partition_chain
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||
cmp dword [ebx+0x1be+0xc],0 ; skip over empty partition
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||
jz next_partition
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push eax ecx
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mov edi,partition_types
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mov ecx,partition_types_end-partition_types
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mov al,[ebx+0x1be+4] ; get partition type
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cld
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repne scasb ; is partition type ok?
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pop ecx eax
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||
jnz next_partition ; no. skip over
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inc ecx
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||
cmp ecx,[fat32part] ; is it wanted partition?
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jnz next_partition ; no
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||
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mov edx,eax ; start sector
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add edx,[ebx+0x1be+8] ; add relative start
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next_partition:
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push ecx
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mov edi,extended_types
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mov ecx,extended_types_end-extended_types
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mov al,[ebx+0x1be+4+16] ; get second partition type
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cld
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repne scasb ; is it extended partition?
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||
pop ecx
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||
jnz end_partition_chain ; no. end chain
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mov eax,[ebx+0x1be+8+16] ; get start of extended partition
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||
test eax,eax ; is there extended partition?
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||
jnz new_partition ; yes. read it
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||
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||
end_partition_chain:
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||
mov [partition_count],ecx
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||
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cmp edx,-1 ; found wanted partition?
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||
jnz hd_and_partition_ok ; yes. install it
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jmp problem_partition_or_fat
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problem_fat_dec_count: ; bootsector is missing or another problem
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dec [partition_count] ; remove it from partition_count
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problem_partition_or_fat:
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popad
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problem_hd:
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mov [fat_type],0
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mov [hd1_status],0 ; free
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mov [problem_partition],1
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ret
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||
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hd_and_partition_ok:
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mov eax,edx
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mov [PARTITION_START],eax
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mov [hd_setup],1
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mov ebx,buffer
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call hd_read ; read boot sector of partition
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mov [hd_setup],0
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cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
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jnz problem_fat_dec_count
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||
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movzx eax,word [ebx+0xe] ; sectors reserved
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||
add eax,[PARTITION_START]
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||
mov [FAT_START],eax ; fat_start = partition_start + reserved
|
||
|
||
movzx eax,byte [ebx+0xd] ; sectors per cluster
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||
mov [SECTORS_PER_CLUSTER],eax
|
||
|
||
movzx ecx,word [ebx+0xb] ; bytes per sector
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||
mov [BYTES_PER_SECTOR],ecx
|
||
|
||
movzx eax,word [ebx+0x11] ; count of rootdir entries (=0 fat32)
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||
mov edx,32
|
||
mul edx
|
||
dec ecx
|
||
add eax,ecx ; round up if not equal count
|
||
inc ecx ; bytes per sector
|
||
div ecx
|
||
mov [ROOT_SECTORS],eax ; count of rootdir sectors
|
||
|
||
movzx eax,word [ebx+0x16] ; sectors per fat <65536
|
||
test eax,eax
|
||
jnz fat16_fatsize
|
||
mov eax,[ebx+0x24] ; sectors per fat
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||
fat16_fatsize:
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||
mov [SECTORS_PER_FAT],eax
|
||
|
||
movzx eax,byte [ebx+0x10] ; number of fats
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||
test eax,eax ; if 0 it's not fat partition
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||
jz problem_fat_dec_count
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mov [NUMBER_OF_FATS],eax
|
||
imul eax,[SECTORS_PER_FAT]
|
||
add eax,[FAT_START]
|
||
mov [ROOT_START],eax ; rootdir = fat_start + fat_size * fat_count
|
||
add eax,[ROOT_SECTORS] ; rootdir sectors should be 0 on fat32
|
||
mov [DATA_START],eax ; data area = rootdir + rootdir_size
|
||
|
||
movzx eax,word [ebx+0x13] ; total sector count <65536
|
||
test eax,eax
|
||
jnz fat16_total
|
||
mov eax,[ebx+0x20] ; total sector count
|
||
fat16_total:
|
||
add eax,[PARTITION_START]
|
||
dec eax
|
||
mov [PARTITION_END],eax
|
||
inc eax
|
||
sub eax,[DATA_START] ; eax = count of data sectors
|
||
xor edx,edx
|
||
div dword [SECTORS_PER_CLUSTER]
|
||
inc eax
|
||
mov [LAST_CLUSTER],eax
|
||
dec eax ; cluster count
|
||
|
||
; limits by Microsoft Hardware White Paper v1.03
|
||
cmp eax,4085 ; 0xff5
|
||
jb problem_fat_dec_count ; fat12 not supported
|
||
cmp eax,65525 ; 0xfff5
|
||
jb fat16_partition
|
||
|
||
fat32_partition:
|
||
mov eax,[ebx+0x2c] ; rootdir cluster
|
||
mov [ROOT_CLUSTER],eax
|
||
movzx eax,word [ebx+0x30] ; fs info sector
|
||
add eax,[PARTITION_START]
|
||
mov [ADR_FSINFO],eax
|
||
|
||
popad
|
||
|
||
mov [fatRESERVED],0x0FFFFFF6
|
||
mov [fatBAD],0x0FFFFFF7
|
||
mov [fatEND],0x0FFFFFF8
|
||
mov [fatMASK],0x0FFFFFFF
|
||
mov [fat_type],32 ; Fat32
|
||
mov [hd1_status],0 ; free
|
||
ret
|
||
|
||
fat16_partition:
|
||
xor eax,eax
|
||
mov [ROOT_CLUSTER],eax
|
||
|
||
popad
|
||
|
||
mov [fatRESERVED],0x0000FFF6
|
||
mov [fatBAD],0x0000FFF7
|
||
mov [fatEND],0x0000FFF8
|
||
mov [fatMASK],0x0000FFFF
|
||
mov [fat_type],16 ; Fat16
|
||
mov [hd1_status],0 ; free
|
||
ret
|
||
|
||
|
||
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 [fat_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
|
||
|
||
sfc_no_change:
|
||
mov [fat_in_cache],eax ; save fat sector
|
||
call hd_read
|
||
|
||
sfc_in_cache:
|
||
cmp [fat_type],16
|
||
jne sfc_test32
|
||
|
||
cmp [f_del],1 ; overwrite previous value?
|
||
je sfc_set16 ; yes
|
||
cmp word [ebx+esi],0 ; is cluster free?
|
||
je sfc_set16 ; yes
|
||
mov dword [8*0x100000],0xffffff
|
||
mov edx,[ebx+esi] ; get old value
|
||
jmp sfc_nonzero
|
||
|
||
sfc_set16:
|
||
xchg [ebx+esi],dx ; save new value and get old value
|
||
jmp sfc_write
|
||
|
||
sfc_test32:
|
||
mov eax,[fatMASK]
|
||
cmp [f_del],1 ; overwrite previous value?
|
||
je sfc_set32 ; yes
|
||
test eax,[ebx+esi] ; is cluster free?
|
||
je sfc_set32 ; yes
|
||
mov dword [8*0x100000],0xffffff
|
||
mov edx,[ebx+esi] ; get old value
|
||
jmp sfc_nonzero
|
||
|
||
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 [fat_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
|
||
|
||
gfc_no_change:
|
||
mov [fat_in_cache],eax
|
||
call hd_read
|
||
|
||
gfc_in_cache:
|
||
mov eax,[ebx+esi]
|
||
and eax,[fatMASK]
|
||
pop esi ebx
|
||
ret
|
||
|
||
|
||
get_free_FAT:
|
||
;-----------------------------------------------------------
|
||
; input : EAX = # cluster for start the searching
|
||
; 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
|
||
|
||
gff_test:
|
||
cmp eax,[LAST_CLUSTER] ; if above last cluster start at cluster 2
|
||
jbe gff_in_range
|
||
mov eax,2
|
||
|
||
gff_in_range:
|
||
push eax
|
||
call get_FAT ; get cluster state
|
||
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:
|
||
pop ecx ; yes. disk is full
|
||
stc
|
||
ret
|
||
|
||
gff_found:
|
||
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
|
||
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 [fat_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
|
||
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 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
|
||
|
||
|
||
analyze_directory_to_write:
|
||
;-----------------------------------------------------------
|
||
; input : EAX = first cluster of the directory
|
||
; output : IF CARRY=0 EAX = sector where the empty pos is found
|
||
; EBX = pointer in buffer
|
||
; [buffer .. buffer+511]
|
||
; ECX,EDX,ESI,EDI not changed
|
||
; IF CARRY=1 disk full or fat corrupted
|
||
; Note : if cluster=0 it's changed to read rootdir
|
||
;-----------------------------------------------------------
|
||
push ecx edx edi
|
||
|
||
adw_new_cluster:
|
||
mov [cluster_tmp],eax
|
||
mov [fat16_root],0
|
||
cmp eax,[LAST_CLUSTER]
|
||
ja adw_not_found ; too big cluster number, something is wrong
|
||
cmp eax,2
|
||
jnb adw_data_cluster
|
||
|
||
mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir
|
||
cmp [fat_type],16
|
||
jne adw_data_cluster
|
||
mov eax,[ROOT_START]
|
||
mov edx,[ROOT_SECTORS]
|
||
mov [fat16_root],1 ; flag for fat16 rootdir
|
||
jmp adw_new_sector
|
||
|
||
adw_data_cluster:
|
||
sub eax,2
|
||
mov edx,[SECTORS_PER_CLUSTER]
|
||
imul eax,edx
|
||
add eax,[DATA_START]
|
||
|
||
adw_new_sector:
|
||
mov ebx,buffer
|
||
call hd_read
|
||
mov ecx,512/32 ; count of dir entrys per sector = 16
|
||
|
||
adw_analyze:
|
||
cmp byte [ebx],0x00 ; is free entry?
|
||
je adw_found ; yes
|
||
cmp byte [ebx],0xe5 ; is deleted entry?
|
||
je adw_found ; yes
|
||
add ebx,32 ; position of next dir entry
|
||
dec ecx
|
||
jnz adw_analyze
|
||
|
||
inc eax ; next sector
|
||
dec edx
|
||
jne adw_new_sector
|
||
cmp [fat16_root],1 ; end of fat16 rootdir
|
||
je adw_not_found
|
||
|
||
mov eax,[cluster_tmp]
|
||
call get_FAT ; get next cluster
|
||
cmp eax,2 ; incorrect fat chain?
|
||
jb adw_not_found ; yes
|
||
cmp eax,[fatRESERVED] ; is it end of directory?
|
||
jb adw_new_cluster ; no. analyse it
|
||
|
||
mov eax,2 ; this block of code add a new cluster
|
||
call get_free_FAT ; for the directory because the directory
|
||
jc adw_not_found ; is full
|
||
|
||
mov edx,[fatEND] ; new end for directory
|
||
call set_FAT
|
||
|
||
push eax ; save new cluster
|
||
mov edx,eax
|
||
mov eax,[cluster_tmp] ; change last cluster to point new cluster
|
||
mov [f_del],1
|
||
call set_FAT
|
||
mov [f_del],0
|
||
|
||
mov ecx,-1 ; remove 1 cluster from free disk space
|
||
call add_disk_free_space
|
||
|
||
mov ecx,512/4
|
||
xor eax,eax
|
||
mov edi,buffer
|
||
cld
|
||
rep stosd ; clear new directory cluster
|
||
pop eax
|
||
|
||
sub eax,2
|
||
mov ecx,[SECTORS_PER_CLUSTER]
|
||
imul eax,ecx
|
||
add eax,[DATA_START]
|
||
mov ebx,buffer
|
||
push eax ; save sector number
|
||
|
||
adw_set_empty_directory:
|
||
call hd_write
|
||
inc eax ; next sector
|
||
dec ecx
|
||
jnz adw_set_empty_directory
|
||
|
||
pop eax
|
||
|
||
adw_found:
|
||
pop edi edx ecx
|
||
clc ; free space found
|
||
ret
|
||
|
||
adw_not_found:
|
||
pop edi edx ecx
|
||
stc ; free space not 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 [fat_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
|
||
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
|
||
|
||
|
||
set_data_cluster:
|
||
;-----------------------------------------------------------
|
||
; input : EAX = cluster
|
||
; EBX = pointer to buffer
|
||
; output : if CARRY=0 ok
|
||
; if CARRY=1 cluster out of range
|
||
;-----------------------------------------------------------
|
||
push eax ebx edx
|
||
|
||
cmp eax,[LAST_CLUSTER]
|
||
ja sdc_error ; too big cluster number, something is wrong
|
||
sub eax,2
|
||
jb sdc_error ; don't allow rootdir write
|
||
|
||
mov edx,[SECTORS_PER_CLUSTER]
|
||
imul eax,edx
|
||
add eax,[DATA_START]
|
||
|
||
sdc_write:
|
||
call hd_write
|
||
add ebx,512 ; update pointer
|
||
inc eax
|
||
dec edx
|
||
jnz sdc_write
|
||
pop edx ebx eax
|
||
clc
|
||
ret
|
||
|
||
sdc_error:
|
||
pop edx ebx 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
|
||
|
||
|
||
makedir:
|
||
;-----------------------------------------------------
|
||
; input : eax = directory name
|
||
; edx = path
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; 5 - file not found
|
||
; 8 - disk full
|
||
; 10 - access denied
|
||
; Note : can only make one directory at time
|
||
;-----------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz make_dir_fat_ok
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
ret
|
||
|
||
make_dir_fat_ok:
|
||
; call reserve_hd1
|
||
|
||
pushad
|
||
|
||
mov ebx,edx
|
||
call get_cluster_of_a_path
|
||
jnc make_dir_found_path
|
||
|
||
make_dir_path_not_found:
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
mov eax,ERROR_FILE_NOT_FOUND
|
||
ret
|
||
|
||
make_dir_disk_full:
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
mov eax,ERROR_DISK_FULL
|
||
ret
|
||
|
||
make_dir_already_exist:
|
||
mov eax,[cluster] ; directory cluster
|
||
xor edx,edx ; free
|
||
mov [f_del],1
|
||
call set_FAT
|
||
mov [f_del],0
|
||
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
mov eax,ERROR_ACCESS_DENIED
|
||
ret
|
||
|
||
make_dir_found_path:
|
||
cmp eax,[ROOT_CLUSTER]
|
||
jnz make_dir_not_root
|
||
xor eax,eax
|
||
|
||
make_dir_not_root:
|
||
mov ecx,eax ; directorys start cluster
|
||
mov word [NewDirEntry2+26],cx ; 16 bits low of cluster
|
||
shr ecx,16
|
||
mov word [NewDirEntry2+20],cx ; 16 bits high of cluster (=0 fat16)
|
||
|
||
push eax ; save parent directory cluster
|
||
mov eax,2
|
||
call get_free_FAT
|
||
mov [cluster],eax ; first free cluster
|
||
pop eax
|
||
jc make_dir_disk_full
|
||
|
||
push eax
|
||
mov eax,[cluster] ; directory cluster
|
||
mov edx,[fatEND] ; end for directory
|
||
call set_FAT
|
||
pop eax
|
||
|
||
mov ebx,PUSHAD_EAX ; dir name
|
||
push eax
|
||
call analyze_directory ; check if directory already exist
|
||
pop eax
|
||
jnc make_dir_already_exist ; need to free allocated cluster!
|
||
|
||
call analyze_directory_to_write
|
||
jc make_dir_already_exist ; need to free allocated cluster!
|
||
|
||
mov esi,PUSHAD_EAX ; dir name
|
||
mov edi,ebx ; pointer in buffer
|
||
mov ecx,11
|
||
cld
|
||
rep movsb
|
||
|
||
mov dword [ebx+28],0 ; dir size is always 0
|
||
mov ecx,[cluster]
|
||
mov [ebx+26],cx ; 16 bits low of cluster
|
||
mov word [NewDirEntry1+26],cx
|
||
shr ecx,16
|
||
mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16)
|
||
mov word [NewDirEntry1+20],cx
|
||
mov byte [ebx+11],0x10 ; attribute = directory
|
||
|
||
call set_current_time_for_entry
|
||
mov ecx,[ebx+22]
|
||
mov dword [NewDirEntry1+22],ecx
|
||
mov dword [NewDirEntry2+22],ecx
|
||
|
||
mov ebx,buffer ; save the directory name,length,cluster
|
||
call hd_write
|
||
|
||
mov ecx,512/4
|
||
xor eax,eax
|
||
mov edi,buffer
|
||
cld
|
||
rep stosd ; clear new directory cluster
|
||
|
||
mov eax,[cluster] ; new directory cluster
|
||
sub eax,2
|
||
mov edx,[SECTORS_PER_CLUSTER]
|
||
imul eax,edx
|
||
add eax,[DATA_START]
|
||
mov ebx,buffer
|
||
add eax,edx ; start from last sector
|
||
|
||
dir_set_empty_directory:
|
||
dec eax ; next sector
|
||
cmp edx,1 ; is first directory sector?
|
||
jnz not_first_sector ; no. write empty sector
|
||
mov esi,NewDirEntry1
|
||
mov edi,buffer
|
||
mov ecx,64/4
|
||
cld
|
||
rep movsd ; copy 2 first directory entrys "." and ".."
|
||
|
||
not_first_sector:
|
||
call hd_write
|
||
dec edx
|
||
jnz dir_set_empty_directory
|
||
|
||
mov ecx,-1 ; remove 1 cluster from free disk space
|
||
call add_disk_free_space
|
||
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
xor eax,eax
|
||
ret
|
||
|
||
|
||
removedir:
|
||
;-----------------------------------------------------
|
||
; input : eax = file/directory name
|
||
; edx = path
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; 5 - file not found
|
||
; 10 - access denied
|
||
;-----------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz remove_dir_fat_ok
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
ret
|
||
|
||
remove_dir_fat_ok:
|
||
; call reserve_hd1
|
||
|
||
push edi
|
||
mov edi,1 ; allow directory remove
|
||
call file_delete
|
||
pop edi
|
||
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
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 [fat_type],32 ; free disk space only used by fat32
|
||
jne add_dfs_no
|
||
|
||
push eax ebx
|
||
mov eax,[ADR_FSINFO]
|
||
mov ebx,buffer
|
||
call hd_read
|
||
cmp dword [ebx+0x1fc],0xaa550000 ; check sector id
|
||
jne add_not_fs
|
||
|
||
add [ebx+0x1e8],ecx
|
||
call hd_write
|
||
|
||
add_not_fs:
|
||
pop ebx eax
|
||
|
||
add_dfs_no:
|
||
ret
|
||
|
||
|
||
file_append:
|
||
;-----------------------------------------------------
|
||
; input : eax = file name
|
||
; edx = path
|
||
; ecx = pointer to buffer
|
||
; ebx = bytes to write (0 = truncate file)
|
||
; esi = start position (-1 = end of file)
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; 5 - file not found
|
||
; 6 - end of file
|
||
; 8 - disk full
|
||
; 9 - fat table corrupted
|
||
; 10 - access denied
|
||
; ebx = bytes written
|
||
;-----------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz append_fat_ok
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
ret
|
||
|
||
append_fat_ok:
|
||
; call reserve_hd1
|
||
|
||
pushad
|
||
|
||
mov ebx,edx
|
||
call get_cluster_of_a_path
|
||
jc append_not_found
|
||
|
||
mov ebx,PUSHAD_EAX ; file name
|
||
call analyze_directory
|
||
jc append_not_found
|
||
|
||
mov [sector_tmp],eax
|
||
mov [entry_pos],ebx
|
||
|
||
test byte [ebx+11],0x10 ; is it directory?
|
||
jnz append_access ; yes
|
||
|
||
mov ecx,[ebx+28] ; file size
|
||
mov edi,PUSHAD_ESI ; write position
|
||
cmp edi,-1 ; -1 = eof
|
||
jnz append_inside_file
|
||
mov edi,ecx ; file size
|
||
|
||
append_inside_file:
|
||
cmp edi,ecx ; start above old file size?
|
||
ja append_eof ; yes
|
||
|
||
mov [old_filesize],ecx
|
||
mov [new_filepos],edi
|
||
|
||
mov ecx,PUSHAD_EBX ; bytes to write
|
||
test ecx,ecx ; truncate?
|
||
jz append_truncate ; yes
|
||
|
||
mov [bytes2write],ecx ; bytes to write
|
||
mov esi,PUSHAD_ECX ; pointer to buffer
|
||
mov eax,[ebx+20-2] ; FAT entry
|
||
mov ax,[ebx+26]
|
||
and eax,[fatMASK]
|
||
jnz append_find_pos ; first cluster <> 0
|
||
|
||
mov eax,2
|
||
call get_free_FAT
|
||
jc append_disk_full
|
||
mov ecx,eax ; set files first cluster
|
||
mov [ebx+26],cx ; 16 bits low of cluster
|
||
shr ecx,16
|
||
mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16)
|
||
mov edx,[fatEND] ; new end for cluster chain
|
||
call set_FAT
|
||
|
||
push eax ; save first cluster
|
||
mov eax,[sector_tmp]
|
||
mov ebx,buffer
|
||
call hd_write ; write new file entry back to disk
|
||
pop eax
|
||
|
||
append_remove_free:
|
||
mov ecx,-1 ; remove 1 cluster from free disk space
|
||
call add_disk_free_space ; Note: uses buffer
|
||
|
||
append_found_cluster:
|
||
mov [cluster],eax
|
||
sub eax,2
|
||
mov ecx,[SECTORS_PER_CLUSTER]
|
||
imul eax,ecx
|
||
add eax,[DATA_START]
|
||
xor edi,edi
|
||
|
||
append_new_sector:
|
||
push ecx
|
||
mov ecx,[bytes2write] ; bytes left in buffer
|
||
mov ebx,512
|
||
sub ebx,edi ; bytes left in sector
|
||
cmp ecx,ebx
|
||
jb append_bytes_ok
|
||
mov ecx,ebx
|
||
|
||
append_bytes_ok:
|
||
cmp ecx,512 ; overwrite full sector?
|
||
jz append_full_sector ; yes
|
||
mov ebx,buffer ; overwrite part of sector
|
||
call hd_read ; read old sector
|
||
|
||
append_full_sector:
|
||
sub [bytes2write],ecx
|
||
add [new_filepos],ecx
|
||
add edi,buffer
|
||
cld
|
||
rep movsb
|
||
pop ecx
|
||
|
||
mov ebx,buffer
|
||
call hd_write
|
||
cmp [bytes2write],0 ; is all done?
|
||
jz append_done
|
||
xor edi,edi
|
||
inc eax
|
||
dec ecx
|
||
jnz append_new_sector
|
||
|
||
mov eax,[cluster]
|
||
call get_FAT
|
||
cmp eax,2
|
||
jb append_fat
|
||
cmp eax,[LAST_CLUSTER]
|
||
jbe append_found_cluster
|
||
|
||
append_alloc_cluster:
|
||
mov eax,2 ; ToDo: use temp array to keep track
|
||
call get_free_FAT ; of last free cluster
|
||
jc append_disk_full
|
||
push eax ; save new cluster
|
||
mov edx,[fatEND] ; new end for cluster chain
|
||
call set_FAT
|
||
mov edx,eax
|
||
mov eax,[cluster]
|
||
mov [f_del],1
|
||
call set_FAT ; update previous cluster
|
||
mov [f_del],0
|
||
pop eax
|
||
jmp append_remove_free
|
||
|
||
append_find_pos:
|
||
call find_filepos
|
||
mov [cluster],ebx
|
||
jnc append_new_sector
|
||
test edi,edi
|
||
jz append_alloc_cluster
|
||
|
||
append_fat:
|
||
mov eax,ERROR_FAT_TABLE
|
||
jmp append_ret_code
|
||
|
||
append_disk_full:
|
||
mov eax,ERROR_DISK_FULL
|
||
jmp append_ret_code
|
||
|
||
append_done:
|
||
xor eax,eax
|
||
|
||
append_ret_code:
|
||
mov PUSHAD_EAX,eax ; return code
|
||
|
||
mov eax,[sector_tmp] ; update directory entry
|
||
mov ebx,buffer
|
||
call hd_read
|
||
mov ebx,[entry_pos]
|
||
mov ecx,[new_filepos]
|
||
cmp ecx,[old_filesize] ; is file pos above old size?
|
||
jbe append_size_ok ; no
|
||
mov [ebx+28],ecx ; new file size
|
||
|
||
append_size_ok:
|
||
call set_current_time_for_entry
|
||
mov ebx,buffer
|
||
call hd_write ; write new file entry back to disk
|
||
|
||
sub ecx,PUSHAD_ESI ; start position
|
||
mov PUSHAD_EBX,ecx ; bytes written
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
ret
|
||
|
||
append_eof:
|
||
popad
|
||
mov [hd1_status],0
|
||
xor ebx,ebx
|
||
mov eax,ERROR_END_OF_FILE
|
||
ret
|
||
|
||
append_not_found:
|
||
popad
|
||
mov [hd1_status],0
|
||
xor ebx,ebx
|
||
mov eax,ERROR_FILE_NOT_FOUND
|
||
ret
|
||
|
||
append_access:
|
||
popad
|
||
mov [hd1_status],0
|
||
xor ebx,ebx
|
||
mov eax,ERROR_ACCESS_DENIED
|
||
ret
|
||
|
||
append_truncate:
|
||
mov edx,[ebx+20-2] ; FAT entry
|
||
mov dx,[ebx+26]
|
||
and edx,[fatMASK]
|
||
mov [ebx+28],edi ; set new file size
|
||
test edi,edi ; 0 length file?
|
||
jnz truncate_save_size ; no
|
||
mov [ebx+20],di ; FAT entry = 0
|
||
mov [ebx+26],di
|
||
|
||
truncate_save_size:
|
||
call set_current_time_for_entry
|
||
mov ebx,buffer
|
||
call hd_write
|
||
mov eax,edx ; first cluster
|
||
test edi,edi ; 0 length file?
|
||
jz truncate_clear_chain
|
||
|
||
imul esi,[SECTORS_PER_CLUSTER],512 ; esi = cluster size in bytes
|
||
|
||
truncate_new_cluster:
|
||
cmp eax,2 ; incorrect fat chain?
|
||
jb truncate_eof ; yes
|
||
cmp eax,[fatRESERVED] ; is it end of file?
|
||
jnb truncate_eof ; yes
|
||
sub edi,esi
|
||
jbe truncate_pos_found
|
||
call get_FAT ; get next cluster
|
||
jmp truncate_new_cluster
|
||
|
||
truncate_pos_found:
|
||
mov edx,[fatEND] ; new end for cluster chain
|
||
mov [f_del],1
|
||
call set_FAT
|
||
mov [f_del],0
|
||
mov eax,edx ; clear rest of chain
|
||
|
||
truncate_clear_chain:
|
||
call clear_cluster_chain
|
||
|
||
truncate_eof:
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
xor ebx,ebx
|
||
xor eax,eax
|
||
ret
|
||
|
||
|
||
find_filepos:
|
||
;-----------------------------------------------------
|
||
; input : eax = first cluster
|
||
; edi = bytes to skip over (start position)
|
||
; output : if CARRY=0 file position found
|
||
; if CARRY=1 end of file found
|
||
; eax = current file sector
|
||
; ebx = last cluster
|
||
; ecx = sector count in last cluster
|
||
; edi = bytes to skip over (sector position)
|
||
;-----------------------------------------------------
|
||
push esi
|
||
mov ecx,[SECTORS_PER_CLUSTER]
|
||
imul esi,ecx,512 ; esi = cluster size in bytes
|
||
mov ebx,eax
|
||
|
||
filepos_new_cluster:
|
||
cmp eax,2 ; incorrect fat chain?
|
||
jb filepos_eof ; yes
|
||
cmp eax,[fatRESERVED] ; is it end of file?
|
||
jnb filepos_eof ; yes
|
||
|
||
mov ebx,eax
|
||
cmp edi,esi ; skip over full cluster?
|
||
jb filepos_cluster_ok ; no
|
||
|
||
sub edi,esi
|
||
call get_FAT ; get next cluster
|
||
jmp filepos_new_cluster
|
||
|
||
filepos_cluster_ok:
|
||
sub eax,2
|
||
imul eax,ecx
|
||
add eax,[DATA_START]
|
||
|
||
filepos_new_sector:
|
||
cmp edi,512 ; skip over full sector?
|
||
jb filepos_sector_ok ; no
|
||
sub edi,512
|
||
inc eax
|
||
dec ecx
|
||
jnz filepos_new_sector
|
||
|
||
filepos_eof:
|
||
pop esi
|
||
stc
|
||
ret
|
||
|
||
filepos_sector_ok:
|
||
pop esi
|
||
clc
|
||
ret
|
||
|
||
|
||
file_write:
|
||
;--------------------------------------------------------------------------
|
||
; INPUT : user-reg register-in-this meaning symbol-in-this-routine
|
||
;
|
||
; EAX EDI system call to write /
|
||
; EBX EAX (PAR0) pointer to file-name PAR0
|
||
; EDX ECX (PAR1) pointer to buffer PAR1
|
||
; ECX EBX (PAR2) file size PAR2
|
||
; ESI EDX (PAR3) pointer to path PAR3
|
||
;
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; 5 - file not found
|
||
; 8 - disk full
|
||
; 10 - access denied
|
||
;--------------------------------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz fat_ok_for_writing
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
ret
|
||
|
||
fat_ok_for_writing:
|
||
; call reserve_hd1
|
||
|
||
pushad
|
||
|
||
xor edi,edi ; don't allow directory remove
|
||
call file_delete ; try to delete the file first
|
||
test eax,eax
|
||
jz old_deleted ; deleted ok
|
||
cmp eax,ERROR_FILE_NOT_FOUND
|
||
jnz exit_write_access ; it exist but can't delete
|
||
|
||
old_deleted:
|
||
mov ebx,PUSHAD_EDX
|
||
call get_cluster_of_a_path
|
||
jnc found_directory_for_writing
|
||
|
||
exit_writing_with_error:
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
mov eax,ERROR_FILE_NOT_FOUND
|
||
ret
|
||
|
||
exit_writing_disk_full_clear:
|
||
mov eax,[sector_tmp]
|
||
mov ebx,buffer
|
||
call hd_read ; read directory sector
|
||
mov edx,[entry_pos]
|
||
mov byte [edx],0xe5 ; mark as deleted
|
||
call hd_write
|
||
mov eax,[edx+20-2] ; FAT entry
|
||
mov ax,[edx+26]
|
||
and eax,[fatMASK]
|
||
call clear_cluster_chain
|
||
|
||
exit_writing_disk_full:
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
mov eax,ERROR_DISK_FULL
|
||
ret
|
||
|
||
exit_write_access:
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
mov eax,ERROR_ACCESS_DENIED
|
||
ret
|
||
|
||
found_directory_for_writing:
|
||
call analyze_directory_to_write
|
||
jc exit_writing_disk_full
|
||
|
||
mov [sector_tmp],eax
|
||
mov [entry_pos],ebx
|
||
push eax ; save directory sector
|
||
mov eax,2
|
||
call get_free_FAT
|
||
mov [cluster],eax ; first free cluster
|
||
pop eax
|
||
jc exit_writing_disk_full
|
||
|
||
mov esi,PUSHAD_EAX ; file name
|
||
mov edi,ebx ; pointer in buffer
|
||
mov ecx,11
|
||
cld
|
||
rep movsb
|
||
|
||
mov esi,PUSHAD_EBX ; file size (bytes left)
|
||
mov [ebx+28],esi ; file size
|
||
mov ecx,[cluster]
|
||
mov [ebx+26],cx ; 16 bits low of cluster
|
||
shr ecx,16
|
||
mov [ebx+20],cx ; 16 bits high of cluster (=0 fat16)
|
||
mov byte [ebx+11],0x20 ; attribute = archive
|
||
|
||
call set_current_time_for_entry
|
||
|
||
mov ebx,buffer ; save the directory name,length,cluster
|
||
call hd_write
|
||
|
||
imul edi,[SECTORS_PER_CLUSTER],512 ; edi = cluster size in bytes
|
||
xor ecx,ecx ; cluster count
|
||
mov ebx,PUSHAD_ECX ; ebx = buffer
|
||
|
||
hd_new_block_write:
|
||
|
||
mov eax,[cluster] ; eax = block
|
||
call set_data_cluster
|
||
|
||
sub esi,edi ; sub wrote bytes
|
||
jbe file_saved_OK ; end if all done
|
||
add ebx,edi ; update buffer position
|
||
|
||
inc eax
|
||
call get_free_FAT ; next free in FAT
|
||
jc exit_writing_disk_full_clear
|
||
|
||
mov edx,eax
|
||
xchg eax,[cluster] ; get old cluster and save new cluster
|
||
call set_FAT ; add it in cluster chain
|
||
dec ecx ; update cluster count
|
||
jmp hd_new_block_write
|
||
|
||
file_saved_OK:
|
||
|
||
mov edx,[fatEND] ; new end for cluster chain
|
||
call set_FAT
|
||
dec ecx ; update cluster count
|
||
|
||
call add_disk_free_space ; remove clusters from free disk space
|
||
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
xor eax,eax
|
||
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
|
||
; ebx = size of file/directory
|
||
;--------------------------------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz fat_ok_for_reading
|
||
xor ebx,ebx
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
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
|
||
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
|
||
|
||
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 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:
|
||
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:
|
||
popad
|
||
mov [hd1_status],0
|
||
xor ebx,ebx
|
||
mov eax,ERROR_FILE_NOT_FOUND
|
||
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 [fat_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
|
||
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
|
||
|
||
|
||
file_delete:
|
||
;-----------------------------------------------------
|
||
; input : eax = file/directory name
|
||
; edx = path
|
||
; edi = 1 - allow directory remove else don't remove directory
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; 5 - file not found
|
||
; 10 - access denied
|
||
;-----------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz file_del_fat_ok
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
ret
|
||
|
||
file_del_fat_ok:
|
||
pushad
|
||
|
||
mov ebx,edx
|
||
call get_cluster_of_a_path
|
||
jc file_to_delete_not_found
|
||
|
||
mov ebx,PUSHAD_EAX ; file/directory name
|
||
call analyze_directory
|
||
jc file_to_delete_not_found
|
||
|
||
test byte [ebx+11],0x10 ; is it directory?
|
||
jz delete_notdir ; no. it's file
|
||
cmp edi,1 ; allow directory remove
|
||
jnz delete_no_access ; no
|
||
|
||
push eax ; save directory sector
|
||
mov eax,[ebx+20-2] ; first cluster of file
|
||
mov ax,[ebx+26] ; 0 length files start cluster = 0
|
||
and eax,[fatMASK]
|
||
xor ebp,ebp ; counter for directory deepnes
|
||
call clear_directory
|
||
pop eax
|
||
jc delete_no_access
|
||
|
||
push ebx ; save directory pointer in buffer
|
||
mov ebx,buffer
|
||
call hd_read ; read directory sector
|
||
pop ebx
|
||
|
||
delete_notdir:
|
||
call delete_entry_name
|
||
mov eax,ecx ; first cluster of file
|
||
call clear_cluster_chain
|
||
popad
|
||
xor eax,eax
|
||
ret
|
||
|
||
delete_no_access:
|
||
popad
|
||
mov eax,ERROR_ACCESS_DENIED
|
||
ret
|
||
|
||
file_to_delete_not_found:
|
||
popad
|
||
mov eax,ERROR_FILE_NOT_FOUND
|
||
ret
|
||
|
||
|
||
clear_cluster_chain:
|
||
;-----------------------------------------------------
|
||
; input : eax = first cluster
|
||
;-----------------------------------------------------
|
||
push eax ecx edx
|
||
xor ecx,ecx ; cluster count
|
||
mov [f_del],1 ; delete on
|
||
|
||
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
|
||
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
|
||
mov [f_del],0
|
||
pop edx ecx eax
|
||
ret
|
||
|
||
|
||
clear_directory:
|
||
;-----------------------------------------------------
|
||
; input : eax = directory cluster
|
||
; ebp = directory deepnes
|
||
; Note : use recursive call
|
||
;-----------------------------------------------------
|
||
pushad
|
||
inc ebp
|
||
cmp ebp,64 ; if over 63 directory deep
|
||
jnb clear_error ; something must be wrong
|
||
|
||
clear_new_cluster:
|
||
cmp eax,[LAST_CLUSTER]
|
||
ja clear_end
|
||
cmp eax,[ROOT_CLUSTER] ; don't remove root cluster
|
||
jz clear_end
|
||
mov esi,eax ; esi = current directory cluster
|
||
sub eax,2
|
||
jb clear_end
|
||
mov ecx,[SECTORS_PER_CLUSTER]
|
||
imul eax,ecx
|
||
add eax,[DATA_START]
|
||
|
||
clear_new_sector:
|
||
mov edi,eax ; edi = current directory sector
|
||
mov ebx,deltree_buffer
|
||
call hd_read
|
||
mov edx,512/32 ; count of dir entrys per sector = 16
|
||
|
||
clear_analyze:
|
||
mov al,[ebx+11] ; file attribute
|
||
and al,0xf
|
||
cmp al,0xf
|
||
je clear_long_filename
|
||
|
||
cmp byte [ebx],'.' ; parent or current directory
|
||
je clear_next_entry
|
||
cmp byte [ebx],0xe5 ; deleted
|
||
je clear_next_entry
|
||
cmp byte [ebx],0 ; empty
|
||
je clear_write_last
|
||
;je clear_next_entry
|
||
|
||
mov eax,[ebx+20-2] ; first cluster of entry
|
||
mov ax,[ebx+26]
|
||
and eax,[fatMASK]
|
||
|
||
test byte [ebx+11],0x10 ; is it directory?
|
||
jz clear_file ; no
|
||
|
||
push eax ebx
|
||
mov eax,edi
|
||
mov ebx,deltree_buffer ; save buffer over recursive call
|
||
call hd_write ; write directory sector to disk
|
||
pop ebx eax
|
||
|
||
call clear_directory ; recursive call !!!
|
||
jc clear_error ; exit if error found
|
||
|
||
push eax ebx
|
||
mov eax,edi
|
||
mov ebx,deltree_buffer
|
||
call hd_read ; read directory sector again
|
||
pop ebx eax
|
||
|
||
clear_file:
|
||
call clear_cluster_chain
|
||
|
||
clear_long_filename:
|
||
mov byte [ebx],0xe5
|
||
|
||
clear_next_entry:
|
||
add ebx,32 ; position of next dir entry
|
||
dec edx
|
||
jnz clear_analyze
|
||
|
||
mov eax,edi
|
||
mov ebx,deltree_buffer
|
||
call hd_write ; write directory sector to disk
|
||
|
||
inc eax ; next sector
|
||
dec ecx
|
||
jnz clear_new_sector
|
||
|
||
mov eax,esi
|
||
call get_FAT ; get next cluster
|
||
jmp clear_new_cluster ; clear it
|
||
|
||
clear_write_last:
|
||
mov eax,edi
|
||
mov ebx,deltree_buffer
|
||
call hd_write ; write directory sector to disk
|
||
|
||
clear_end:
|
||
popad
|
||
clc
|
||
ret
|
||
|
||
clear_error:
|
||
popad
|
||
stc
|
||
ret
|
||
|
||
|
||
delete_entry_name:
|
||
;-----------------------------------------------------
|
||
; input : eax = directory sector
|
||
; ebx = directory pointer in buffer
|
||
; longname_sec = 2 previous directory sectors
|
||
; output : ecx = first cluster
|
||
; change : eax,ebx,edx
|
||
;-----------------------------------------------------
|
||
mov byte [ebx],0xe5
|
||
mov ecx,[ebx+20-2] ; first cluster of file
|
||
mov cx,[ebx+26] ; 0 length files start cluster = 0
|
||
and ecx,[fatMASK]
|
||
|
||
delete_empty:
|
||
sub ebx,32
|
||
cmp ebx,buffer
|
||
jnb delete_test_long
|
||
|
||
mov ebx,buffer
|
||
call hd_write ; write directory sector back
|
||
xor eax,eax
|
||
xchg eax,[longname_sec2]
|
||
xchg eax,[longname_sec1]
|
||
test eax,eax ; is there previous directory sector?
|
||
jz delete_name_end ; no
|
||
|
||
mov ebx,buffer
|
||
call hd_read ; read previous sector
|
||
mov ebx,buffer+0x1e0 ; start from last entry
|
||
|
||
delete_test_long:
|
||
mov dh,[ebx+11] ; file attribute
|
||
and dh,0xf
|
||
cmp dh,0xf
|
||
jne delete_write_buffer
|
||
|
||
cmp byte [ebx],0x40 ; end of long dir entry?
|
||
mov byte [ebx],0xe5
|
||
jb delete_empty
|
||
|
||
delete_write_buffer:
|
||
mov ebx,buffer
|
||
call hd_write ; write directory sector back
|
||
|
||
delete_name_end:
|
||
ret
|
||
|
||
|
||
rename:
|
||
;-----------------------------------------------------------
|
||
; input : eax = source directory name
|
||
; edx = source path
|
||
; ebx = dest directory name
|
||
; edi = dest path
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; 5 - file not found
|
||
; 8 - disk full
|
||
; 10 - access denied
|
||
;-----------------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz fat_ok_for_rename
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
ret
|
||
|
||
fat_ok_for_rename:
|
||
; call reserve_hd1
|
||
|
||
pushad
|
||
|
||
mov ebx,edx ; source path
|
||
call get_cluster_of_a_path
|
||
jc rename_entry_not_found
|
||
|
||
mov ebx,PUSHAD_EAX ; source directory name
|
||
call analyze_directory
|
||
jc rename_entry_not_found
|
||
|
||
mov [sector_tmp],eax ; save source sector
|
||
mov [entry_pos],ebx
|
||
mov esi,ebx
|
||
mov edi,dir_entry
|
||
mov ecx,32/4
|
||
cld
|
||
rep movsd ; save entry
|
||
|
||
mov ebx,PUSHAD_EDI ; dest path
|
||
call get_cluster_of_a_path
|
||
jc rename_entry_not_found
|
||
|
||
mov edx,eax ; save dest directory cluster
|
||
mov ebx,PUSHAD_EBX ; dest directory name
|
||
push [longname_sec1]
|
||
push [longname_sec2]
|
||
call analyze_directory ; check if entry already exist
|
||
pop [longname_sec2]
|
||
pop [longname_sec1]
|
||
jnc rename_entry_already_exist
|
||
|
||
mov eax,edx
|
||
call analyze_directory_to_write
|
||
jc rename_disk_full
|
||
|
||
mov esi,dir_entry
|
||
mov edi,ebx
|
||
mov ecx,32/4
|
||
cld
|
||
rep movsd ; copy entry
|
||
mov esi,PUSHAD_EBX ; dest directory name
|
||
mov edi,ebx
|
||
mov ecx,11
|
||
rep movsb ; copy name
|
||
|
||
mov ebx,buffer ; save the directory name,length,cluster
|
||
call hd_write
|
||
|
||
test byte [dir_entry+11],0x10 ; is it directory?
|
||
jz rename_not_dir ; no
|
||
mov eax,[dir_entry+20-2] ; FAT entry
|
||
mov ax,[dir_entry+26]
|
||
and eax,[fatMASK]
|
||
call change_2dot_cluster
|
||
|
||
rename_not_dir:
|
||
mov eax,[sector_tmp]
|
||
mov ebx,buffer
|
||
call hd_read ; read source directory sector
|
||
|
||
mov ebx,[entry_pos]
|
||
call delete_entry_name
|
||
|
||
popad
|
||
call update_disk ; write all of cache and fat to hd
|
||
mov [hd1_status],0
|
||
xor eax,eax
|
||
ret
|
||
|
||
rename_entry_not_found:
|
||
popad
|
||
mov [hd1_status],0
|
||
mov eax,ERROR_FILE_NOT_FOUND
|
||
ret
|
||
|
||
rename_entry_already_exist:
|
||
popad
|
||
mov [hd1_status],0
|
||
mov eax,ERROR_ACCESS_DENIED
|
||
ret
|
||
|
||
rename_disk_full:
|
||
popad
|
||
mov [hd1_status],0
|
||
mov eax,ERROR_DISK_FULL
|
||
ret
|
||
|
||
|
||
change_2dot_cluster:
|
||
;-----------------------------------------------------------
|
||
; input : eax = directory cluster
|
||
; edx = value to save
|
||
; change : eax,ebx,edx
|
||
;-----------------------------------------------------------
|
||
cmp eax,[LAST_CLUSTER]
|
||
ja not_2dot ; too big cluster number, something is wrong
|
||
sub eax,2
|
||
jb not_2dot
|
||
|
||
imul eax,[SECTORS_PER_CLUSTER]
|
||
add eax,[DATA_START]
|
||
mov ebx,buffer
|
||
call hd_read
|
||
|
||
cmp dword [ebx+32],'.. '
|
||
jnz not_2dot
|
||
|
||
cmp edx,[ROOT_CLUSTER] ; is rootdir cluster?
|
||
jne not_2dot_root
|
||
xor edx,edx ; yes. set it zero
|
||
|
||
not_2dot_root:
|
||
mov [ebx+32+26],dx ; 16 bits low of cluster
|
||
shr edx,16
|
||
mov [ebx+32+20],dx ; 16 bits high of cluster (=0 fat16)
|
||
call hd_write
|
||
|
||
not_2dot:
|
||
ret
|
||
|
||
|
||
get_filesize:
|
||
;-----------------------------------------------------------
|
||
; input : eax = file name
|
||
; edx = path
|
||
; edi = if 0 - read rootdir else normal dir/file size
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; 5 - file not found
|
||
; ebx = file size
|
||
;-----------------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz get_filesize_fat_ok
|
||
xor ebx,ebx
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
ret
|
||
|
||
get_filesize_fat_ok:
|
||
; call reserve_hd1
|
||
|
||
pushad
|
||
xor eax,eax
|
||
test edi,edi ; is read rootdir?
|
||
je get_filesize_dirsize ; yes
|
||
|
||
get_filesize_no_root:
|
||
mov ebx,edx
|
||
call get_cluster_of_a_path
|
||
jc get_filesize_not_found
|
||
|
||
mov ebx,PUSHAD_EAX ; file name
|
||
call analyze_directory
|
||
jc get_filesize_not_found
|
||
|
||
mov eax,[ebx+28] ; file size
|
||
test byte [ebx+11],0x10 ; is it directory?
|
||
jz get_filesize_set_size ; no
|
||
|
||
mov eax,[ebx+20-2] ; FAT entry
|
||
mov ax,[ebx+26]
|
||
and eax,[fatMASK]
|
||
|
||
get_filesize_dirsize:
|
||
call get_dir_size
|
||
|
||
get_filesize_set_size:
|
||
mov PUSHAD_EBX,eax
|
||
popad
|
||
mov [hd1_status],0
|
||
xor eax,eax
|
||
ret
|
||
|
||
get_filesize_not_found:
|
||
popad
|
||
mov [hd1_status],0
|
||
xor ebx,ebx
|
||
mov eax,ERROR_FILE_NOT_FOUND
|
||
ret
|
||
|
||
|
||
get_fileattr:
|
||
;-----------------------------------------------------------
|
||
; input : eax = file name
|
||
; edx = path
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; 5 - file not found
|
||
; ebx = file attribute
|
||
;-----------------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz get_fileattr_fat_ok
|
||
xor ebx,ebx
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
ret
|
||
|
||
get_fileattr_fat_ok:
|
||
; call reserve_hd1
|
||
|
||
pushad
|
||
mov ebx,edx
|
||
call get_cluster_of_a_path
|
||
jc get_fileattr_not_found
|
||
|
||
mov ebx,PUSHAD_EAX ; file name
|
||
call analyze_directory
|
||
jc get_fileattr_not_found
|
||
|
||
movzx eax,byte [ebx+11] ; file attribute
|
||
mov PUSHAD_EBX,eax
|
||
popad
|
||
mov [hd1_status],0
|
||
xor eax,eax
|
||
ret
|
||
|
||
get_fileattr_not_found:
|
||
popad
|
||
mov [hd1_status],0
|
||
xor ebx,ebx
|
||
mov eax,ERROR_FILE_NOT_FOUND
|
||
ret
|
||
|
||
|
||
get_filedate:
|
||
;-----------------------------------------------------------
|
||
; input : eax = file name
|
||
; edx = path
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; 5 - file not found
|
||
; ebx = file date/time
|
||
; bits 31..25 = year-1980
|
||
; bits 24..21 = month
|
||
; bits 20..16 = day
|
||
; bits 15..11 = hour
|
||
; bits 10..5 = minute
|
||
; bits 4..0 = second/2
|
||
;-----------------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz get_filedate_fat_ok
|
||
xor ebx,ebx
|
||
mov eax,ERROR_UNKNOWN_FS
|
||
ret
|
||
|
||
get_filedate_fat_ok:
|
||
; call reserve_hd1
|
||
|
||
pushad
|
||
mov ebx,edx
|
||
call get_cluster_of_a_path
|
||
jc get_filedate_not_found
|
||
|
||
mov ebx,PUSHAD_EAX ; file name
|
||
call analyze_directory
|
||
jc get_filedate_not_found
|
||
|
||
mov eax,[ebx+22] ; file date/time
|
||
mov PUSHAD_EBX,eax
|
||
popad
|
||
mov [hd1_status],0
|
||
xor eax,eax
|
||
ret
|
||
|
||
get_filedate_not_found:
|
||
popad
|
||
mov [hd1_status],0
|
||
xor ebx,ebx
|
||
mov eax,ERROR_FILE_NOT_FOUND
|
||
ret
|
||
|
||
|
||
get_hd_info:
|
||
;-----------------------------------------------------------
|
||
; output : eax = 0 - ok
|
||
; 3 - unknown FS
|
||
; edx = cluster size in bytes
|
||
; ebx = total clusters on disk
|
||
; ecx = free clusters on disk
|
||
;-----------------------------------------------------------
|
||
cmp [fat_type],0
|
||
jnz 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
|
||
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
|
||
|
||
|
||
update_disk:
|
||
;-----------------------------------------------------------
|
||
; write changed fat and cache to disk
|
||
;-----------------------------------------------------------
|
||
cmp [fat_change],0 ; is fat changed?
|
||
je upd_no_change
|
||
|
||
call write_fat_sector
|
||
|
||
upd_no_change:
|
||
|
||
call write_cache
|
||
ret
|
||
|
||
|
||
;**************************************************************************
|
||
;
|
||
; 0x600008 - first entry in cache list
|
||
;
|
||
; +0 - lba sector
|
||
; +4 - state of cache sector
|
||
; 0 = empty
|
||
; 1 = used for read ( same as in hd )
|
||
; 2 = used for write ( differs from hd )
|
||
;
|
||
; +65536 - cache entries
|
||
;
|
||
;**************************************************************************
|
||
|
||
|
||
hd_read:
|
||
;-----------------------------------------------------------
|
||
; input : eax = block to read
|
||
; ebx = destination
|
||
;-----------------------------------------------------------
|
||
push ecx esi edi ; scan cache
|
||
|
||
mov ecx,cache_max ; entries in cache
|
||
mov esi,0x600000+8
|
||
mov edi,1
|
||
|
||
hdreadcache:
|
||
|
||
cmp dword [esi+4],0 ; empty
|
||
je nohdcache
|
||
|
||
cmp [esi],eax ; correct sector
|
||
je yeshdcache
|
||
|
||
nohdcache:
|
||
|
||
add esi,8
|
||
inc edi
|
||
dec ecx
|
||
jnz hdreadcache
|
||
|
||
call find_empty_slot ; ret in edi
|
||
|
||
call wait_for_hd_idle
|
||
push eax edx
|
||
|
||
cli
|
||
xor eax,eax
|
||
mov edx,[hdbase]
|
||
inc edx
|
||
out dx,al ; ATAFeatures <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> "<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>"
|
||
inc edx
|
||
inc eax
|
||
out dx,al ; ATASectorCount <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||
inc edx
|
||
mov eax,[esp+4]
|
||
out dx,al ; ATASectorNumber <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||
shr eax,8
|
||
inc edx
|
||
out dx,al ; ATACylinder <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> (<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||
shr eax,8
|
||
inc edx
|
||
out dx,al ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> (<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
|
||
shr eax,8
|
||
inc edx
|
||
and al,1+2+4+8
|
||
add al,byte [hdid]
|
||
add al,128+64+32
|
||
out dx,al ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>/<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||
inc edx
|
||
mov al,20h
|
||
out dx,al ; ATACommand <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
|
||
sti
|
||
|
||
call wait_for_sector_buffer
|
||
|
||
cmp [hd_error],0
|
||
jne hd_read_error
|
||
|
||
cli
|
||
push edi
|
||
shl edi,9
|
||
add edi,0x600000+65536
|
||
mov ecx,256
|
||
mov edx,[hdbase]
|
||
cld
|
||
rep insw
|
||
pop edi
|
||
sti
|
||
|
||
pop edx eax
|
||
blok_read_2:
|
||
lea esi,[edi*8+0x600000]
|
||
mov [esi],eax ; sector number
|
||
mov dword [esi+4],1 ; hd read - mark as same as in hd
|
||
|
||
yeshdcache:
|
||
|
||
mov esi,edi
|
||
shl esi,9
|
||
add esi,0x600000+65536
|
||
mov edi,ebx
|
||
mov ecx,512/4
|
||
cld
|
||
rep movsd ; move data
|
||
; blok_read_2:
|
||
pop edi esi ecx
|
||
ret
|
||
|
||
|
||
hd_write:
|
||
;-----------------------------------------------------------
|
||
; input : eax = block
|
||
; ebx = pointer to memory
|
||
;-----------------------------------------------------------
|
||
push ecx esi edi
|
||
|
||
; check if the cache already has the sector and overwrite it
|
||
|
||
mov ecx,cache_max
|
||
mov esi,0x600000+8
|
||
mov edi,1
|
||
|
||
hdwritecache:
|
||
|
||
cmp dword [esi+4],0 ; if cache slot is empty
|
||
je not_in_cache_write
|
||
|
||
cmp [esi],eax ; if the slot has the sector
|
||
je yes_in_cache_write
|
||
|
||
not_in_cache_write:
|
||
|
||
add esi,8
|
||
inc edi
|
||
dec ecx
|
||
jnz hdwritecache
|
||
|
||
; sector not found in cache
|
||
; write the block to a new location
|
||
|
||
call find_empty_slot ; ret in edi
|
||
|
||
lea esi,[edi*8+0x600000]
|
||
mov [esi],eax ; sector number
|
||
|
||
yes_in_cache_write:
|
||
|
||
mov dword [esi+4],2 ; write - differs from hd
|
||
|
||
shl edi,9
|
||
add edi,0x600000+65536
|
||
mov esi,ebx
|
||
mov ecx,512/4
|
||
cld
|
||
rep movsd ; move data
|
||
|
||
pop edi esi ecx
|
||
ret
|
||
|
||
|
||
write_cache:
|
||
;-----------------------------------------------------------
|
||
; write all changed sectors to disk
|
||
;-----------------------------------------------------------
|
||
push eax ecx edx esi edi
|
||
|
||
; write difference ( 2 ) from cache to hd
|
||
|
||
mov ecx,cache_max
|
||
mov esi,0x600000+8
|
||
mov edi,1
|
||
|
||
write_cache_more:
|
||
|
||
cmp dword [esi+4],2 ; if cache slot is not different
|
||
jne does_not_need_writing
|
||
|
||
mov dword [esi+4],1 ; same as in hd
|
||
mov eax,[esi] ; eax = sector to write
|
||
|
||
cmp eax,[PARTITION_START]
|
||
jb danger
|
||
cmp eax,[PARTITION_END]
|
||
ja danger
|
||
|
||
call wait_for_hd_idle
|
||
|
||
cli
|
||
xor eax,eax
|
||
mov edx,[hdbase]
|
||
inc edx
|
||
out dx,al
|
||
inc edx
|
||
inc eax
|
||
out dx,al
|
||
inc edx
|
||
mov eax,[esi] ; eax = sector to write
|
||
out dx,al
|
||
shr eax,8
|
||
inc edx
|
||
out dx,al
|
||
shr eax,8
|
||
inc edx
|
||
out dx,al
|
||
shr eax,8
|
||
inc edx
|
||
and al,1+2+4+8
|
||
add al,byte [hdid]
|
||
add al,128+64+32
|
||
out dx,al
|
||
inc edx
|
||
mov al,30h
|
||
out dx,al
|
||
sti
|
||
|
||
call wait_for_sector_buffer
|
||
|
||
cmp [hd_error],0
|
||
jne hd_write_error
|
||
|
||
push ecx esi
|
||
|
||
cli
|
||
mov esi,edi
|
||
shl esi,9
|
||
add esi,0x600000+65536 ; esi = from memory position
|
||
mov ecx,256
|
||
mov edx,[hdbase]
|
||
cld
|
||
rep outsw
|
||
sti
|
||
|
||
pop esi ecx
|
||
|
||
danger:
|
||
does_not_need_writing:
|
||
|
||
add esi,8
|
||
inc edi
|
||
dec ecx
|
||
jnz write_cache_more
|
||
|
||
pop edi esi edx ecx eax
|
||
ret
|
||
|
||
|
||
find_empty_slot:
|
||
;-----------------------------------------------------------
|
||
; find empty or read slot, flush cache if next 10% is used by write
|
||
; output : edi = cache slot
|
||
;-----------------------------------------------------------
|
||
push ecx esi
|
||
|
||
search_again:
|
||
|
||
mov ecx,cache_max*10/100
|
||
mov edi,[cache_search_start]
|
||
|
||
search_for_empty:
|
||
|
||
inc edi
|
||
cmp edi,cache_max
|
||
jbe inside_cache
|
||
mov edi,1
|
||
|
||
inside_cache:
|
||
|
||
cmp dword [edi*8+0x600000+4],2 ; get cache slot info
|
||
jb found_slot ; it's empty or read
|
||
dec ecx
|
||
jnz search_for_empty
|
||
|
||
call write_cache ; no empty slots found, write all
|
||
jmp search_again ; and start again
|
||
|
||
found_slot:
|
||
|
||
mov [cache_search_start],edi
|
||
|
||
pop esi ecx
|
||
ret
|
||
|
||
|
||
save_hd_wait_timeout:
|
||
|
||
push eax
|
||
mov eax,[timer_ticks];[0xfdf0]
|
||
add eax,300 ; 3 sec timeout
|
||
mov [hd_wait_timeout],eax
|
||
pop eax
|
||
ret
|
||
|
||
|
||
check_hd_wait_timeout:
|
||
|
||
push eax
|
||
mov eax,[hd_wait_timeout]
|
||
cmp [timer_ticks], eax ;[0xfdf0],eax
|
||
jg hd_timeout_error
|
||
pop eax
|
||
ret
|
||
|
||
iglobal
|
||
hd_timeout_str db 'K : FS - HD timeout',13,10,0
|
||
hd_read_str db 'K : FS - HD read error',13,10,0
|
||
hd_write_str db 'K : FS - HD write error',13,10,0
|
||
endg
|
||
|
||
hd_timeout_error:
|
||
|
||
call clear_hd_cache
|
||
call clear_application_table_status
|
||
mov esi,hd_timeout_str
|
||
call sys_msg_board_str
|
||
jmp $
|
||
|
||
|
||
hd_read_error:
|
||
|
||
call clear_hd_cache
|
||
call clear_application_table_status
|
||
mov esi,hd_read_str
|
||
call sys_msg_board_str
|
||
jmp $
|
||
|
||
hd_write_error:
|
||
|
||
call clear_hd_cache
|
||
call clear_application_table_status
|
||
mov esi,hd_write_str
|
||
call sys_msg_board_str
|
||
jmp $
|
||
|
||
|
||
|
||
|
||
wait_for_hd_idle:
|
||
|
||
push eax edx
|
||
|
||
call save_hd_wait_timeout
|
||
|
||
mov edx,[hdbase]
|
||
add edx,0x7
|
||
|
||
wfhil1:
|
||
|
||
call check_hd_wait_timeout
|
||
|
||
in al,dx
|
||
test al,128
|
||
jnz wfhil1
|
||
|
||
pop edx eax
|
||
ret
|
||
|
||
|
||
wait_for_sector_buffer:
|
||
|
||
push eax edx
|
||
|
||
mov edx,[hdbase]
|
||
add edx,0x7
|
||
|
||
call save_hd_wait_timeout
|
||
|
||
hdwait_sbuf: ; wait for sector buffer to be ready
|
||
|
||
call check_hd_wait_timeout
|
||
|
||
in al,dx
|
||
test al,8
|
||
jz hdwait_sbuf
|
||
|
||
mov [hd_error],0
|
||
|
||
cmp [hd_setup],1 ; do not mark error for setup request
|
||
je buf_wait_ok
|
||
|
||
test al,1 ; previous command ended up with an error
|
||
jz buf_wait_ok
|
||
mov [hd_error],1
|
||
|
||
buf_wait_ok:
|
||
|
||
pop edx eax
|
||
ret
|
||
|
||
|
||
|
||
read_hd_file:
|
||
;-----------------------------------------------------------------
|
||
;
|
||
; Converting old reading function for hd-application start.
|
||
;
|
||
; IN:
|
||
;
|
||
; eax - pointer to file (0 = read only first sector of drive: eg 'label')
|
||
; ebx - file lenght
|
||
; ecx - start 512 byte block number
|
||
; edx - number of blocks to read
|
||
; esi - pointer to return/work area (atleast 20 000 bytes)
|
||
;
|
||
; For new read function
|
||
;
|
||
; EAX (PAR0) pointer to file-name
|
||
; ECX (PAR1) pointer to buffer
|
||
; EBX (PAR2) vt file blocks to read
|
||
; EDX (PAR3) pointer to path
|
||
; ESI vt first 512 block to read
|
||
; EDI if 0 - return root
|
||
;--------------------------------------------------------------------------
|
||
|
||
push ecx esi edi
|
||
mov esi,eax
|
||
mov edi,startpath
|
||
mov ecx,250
|
||
cld
|
||
rep movsb
|
||
pop edi esi ecx
|
||
|
||
mov eax,startpath
|
||
mov [eax+ebx-12],byte 0
|
||
|
||
push eax ebx ecx edx esi
|
||
|
||
pop ecx ; pointer to buffer
|
||
add ecx,1024
|
||
pop ebx ; number of blocks to read
|
||
pop esi ; first block to read
|
||
dec esi
|
||
pop eax ; file length
|
||
pop edx ; pointer to path
|
||
|
||
mov edi,12
|
||
lea eax,[eax+edx-12+1]
|
||
call file_read
|
||
|
||
ret
|
||
|