mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-27 16:59:41 +03:00
2926 lines
76 KiB
PHP
2926 lines
76 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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;; ;;
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;; FAT32.INC ;;
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;; ;;
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;; FAT16/32 functions for KolibriOS ;;
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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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;; 04.02.2007 LFN create folder - diamond ;;
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;; 08.10.2006 LFN delete file/folder - diamond ;;
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;; 20.08.2006 LFN set file size (truncate/extend) - diamond ;;
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;; 17.08.2006 LFN write/append to file - diamond ;;
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;; 23.06.2006 LFN start application - diamond ;;
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;; 15.06.2006 LFN get/set file/folder info - diamond ;;
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;; 27.05.2006 LFN create/rewrite file - diamond ;;
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;; 04.05.2006 LFN read folder - diamond ;;
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;; 29.04.2006 Elimination of hangup after the ;;
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;; expiration hd_wait_timeout - Mario79 ;;
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;; 23.04.2006 LFN read file - diamond ;;
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;; 28.01.2006 find all Fat16/32 partition in all input point ;;
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;; to MBR, see file part_set.inc - Mario79 ;;
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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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$Revision$
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cache_max equ 1919 ; max. is 1919*512+0x610000=0x6ffe00
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ERROR_SUCCESS = 0
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ERROR_DISK_BASE = 1
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ERROR_UNSUPPORTED_FS = 2
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ERROR_UNKNOWN_FS = 3
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ERROR_PARTITION = 4
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ERROR_FILE_NOT_FOUND = 5
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ERROR_END_OF_FILE = 6
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ERROR_MEMORY_POINTER = 7
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ERROR_DISK_FULL = 8
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ERROR_FAT_TABLE = 9
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ERROR_ACCESS_DENIED = 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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uglobal
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align 4
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partition_count dd 0 ; partitions found by set_FAT32_variables
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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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hd_error dd 0 ; set by wait_for_sector_buffer
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hd_setup dd 0
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hd_wait_timeout dd 0
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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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file_size dd 0 ; used by file_read
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cache_search_start dd 0 ; used by find_empty_slot
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endg
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iglobal
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fat_in_cache dd -1
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endg
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uglobal
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align 4
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fat_cache: times 512 db 0
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Sector512: ; label for dev_hdcd.inc
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buffer: times 512 db 0
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fsinfo_buffer: times 512 db 0
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endg
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uglobal
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fat16_root db 0 ; flag for fat16 rootdir
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fat_change db 0 ; 1=fat has changed
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endg
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reserve_hd1:
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pushfd
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cli
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cmp [hd1_status],0 ;FIXME use mutex
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je reserve_ok1
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popfd
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call change_task
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jmp reserve_hd1
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reserve_ok1:
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push eax
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mov eax,[CURRENT_TASK]
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shl eax,5
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mov eax,[eax+CURRENT_TASK+TASKDATA.pid]
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mov [hd1_status],eax
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pop eax
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popfd
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ret
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;********************************************
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uglobal
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hd_in_cache db ?
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endg
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reserve_hd_channel:
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; BIOS disk accesses are protected with common mutex hd1_status
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; This must be modified when hd1_status will not be valid!
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cmp [hdpos], 0x80
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jae .ret
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cmp [hdbase], 0x1F0
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jne .IDE_Channel_2
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.IDE_Channel_1:
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pushfd
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cli
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cmp [IDE_Channel_1],0
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je .reserve_ok_1
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popfd
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call change_task
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jmp .IDE_Channel_1
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.IDE_Channel_2:
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pushfd
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cli
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cmp [IDE_Channel_2],0
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je .reserve_ok_2
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popfd
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call change_task
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jmp .IDE_Channel_2
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.reserve_ok_1:
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mov [IDE_Channel_1], 1
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popfd
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push eax
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mov al, 1
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jmp @f
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.reserve_ok_2:
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mov [IDE_Channel_2], 1
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popfd
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push eax
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mov al, 3
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@@:
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cmp [hdid], 1
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sbb al, -1
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cmp al, [hd_in_cache]
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jz @f
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mov [hd_in_cache], al
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call clear_hd_cache
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@@:
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pop eax
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.ret:
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ret
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free_hd_channel:
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; see comment at reserve_hd_channel
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cmp [hdpos], 0x80
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jae .ret
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cmp [hdbase], 0x1F0
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jne .IDE_Channel_2
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.IDE_Channel_1:
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mov [IDE_Channel_1],0
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.ret:
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ret
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.IDE_Channel_2:
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mov [IDE_Channel_2],0
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ret
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;********************************************
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problem_partition db 0 ; used for partitions search
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include 'part_set.inc'
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set_FAT:
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;--------------------------------
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; input : EAX = cluster
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; EDX = value to save
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; output : EDX = old value
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;--------------------------------
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push eax ebx esi
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cmp eax,2
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jb sfc_error
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cmp eax,[LAST_CLUSTER]
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ja sfc_error
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cmp [fs_type],16
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je sfc_1
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add eax,eax
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sfc_1:
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add eax,eax
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mov esi,511
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and esi,eax ; esi = position in fat sector
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shr eax,9 ; eax = fat sector
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add eax,[FAT_START]
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mov ebx,fat_cache
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cmp eax,[fat_in_cache] ; is fat sector already in memory?
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je sfc_in_cache ; yes
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cmp [fat_change],0 ; is fat changed?
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je sfc_no_change ; no
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call write_fat_sector ; yes. write it into disk
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cmp [hd_error],0
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jne sfc_error
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sfc_no_change:
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mov [fat_in_cache],eax ; save fat sector
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call hd_read
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cmp [hd_error],0
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jne sfc_error
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sfc_in_cache:
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cmp [fs_type],16
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jne sfc_test32
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sfc_set16:
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xchg [ebx+esi],dx ; save new value and get old value
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jmp sfc_write
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sfc_test32:
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mov eax,[fatMASK]
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sfc_set32:
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and edx,eax
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xor eax,-1 ; mask for high bits
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and eax,[ebx+esi] ; get high 4 bits
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or eax,edx
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mov edx,[ebx+esi] ; get old value
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mov [ebx+esi],eax ; save new value
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sfc_write:
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mov [fat_change],1 ; fat has changed
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sfc_nonzero:
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and edx,[fatMASK]
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sfc_error:
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pop esi ebx eax
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ret
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get_FAT:
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;--------------------------------
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; input : EAX = cluster
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; output : EAX = next cluster
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;--------------------------------
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push ebx esi
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cmp [fs_type],16
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je gfc_1
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add eax,eax
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gfc_1:
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add eax,eax
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mov esi,511
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and esi,eax ; esi = position in fat sector
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shr eax,9 ; eax = fat sector
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add eax,[FAT_START]
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mov ebx,fat_cache
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cmp eax,[fat_in_cache] ; is fat sector already in memory?
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je gfc_in_cache
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cmp [fat_change],0 ; is fat changed?
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je gfc_no_change ; no
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call write_fat_sector ; yes. write it into disk
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cmp [hd_error],0
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jne hd_error_01
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gfc_no_change:
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mov [fat_in_cache],eax
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call hd_read
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cmp [hd_error],0
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jne hd_error_01
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gfc_in_cache:
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mov eax,[ebx+esi]
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and eax,[fatMASK]
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hd_error_01:
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pop esi ebx
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ret
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get_free_FAT:
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;-----------------------------------------------------------
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; output : if CARRY=0 EAX = # first cluster found free
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; if CARRY=1 disk full
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; Note : for more speed need to use fat_cache directly
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;-----------------------------------------------------------
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push ecx
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mov ecx,[LAST_CLUSTER] ; counter for full disk
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sub ecx,2
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mov eax,[fatStartScan]
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cmp eax,2
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jb gff_reset
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gff_test:
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cmp eax,[LAST_CLUSTER] ; if above last cluster start at cluster 2
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jbe gff_in_range
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gff_reset:
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mov eax,2
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gff_in_range:
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push eax
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call get_FAT ; get cluster state
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cmp [hd_error],0
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jne gff_not_found_1
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test eax,eax ; is it free?
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pop eax
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je gff_found ; yes
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inc eax ; next cluster
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dec ecx ; is all checked?
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jns gff_test ; no
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gff_not_found_1:
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add esp,4
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gff_not_found:
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pop ecx ; yes. disk is full
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stc
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ret
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gff_found:
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lea ecx,[eax+1]
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mov [fatStartScan],ecx
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pop ecx
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clc
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ret
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write_fat_sector:
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;-----------------------------------------------------------
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; write changed fat to disk
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;-----------------------------------------------------------
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push eax ebx ecx
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mov [fat_change],0
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mov eax,[fat_in_cache]
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cmp eax,-1
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jz write_fat_not_used
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mov ebx,fat_cache
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mov ecx,[NUMBER_OF_FATS]
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write_next_fat:
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call hd_write
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cmp [hd_error],0
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jne write_fat_not_used
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add eax,[SECTORS_PER_FAT]
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dec ecx
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jnz write_next_fat
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write_fat_not_used:
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pop ecx ebx eax
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ret
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analyze_directory:
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;-----------------------------------------------------------
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; input : EAX = first cluster of the directory
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; EBX = pointer to filename
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; output : IF CARRY=0 EAX = sector where th file is found
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; EBX = pointer in buffer
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; [buffer .. buffer+511]
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; ECX,EDX,ESI,EDI not changed
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; IF CARRY=1 filename not found
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; Note : if cluster=0 it's changed to read rootdir
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; save 2 previous directory sectors in longname_sec
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;-----------------------------------------------------------
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push ecx edx esi edi ebx ; ebx = [esp+0]
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mov [longname_sec1],0
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mov [longname_sec2],0
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adr_new_cluster:
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mov [cluster_tmp],eax
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mov [fat16_root],0
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cmp eax,[LAST_CLUSTER]
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ja adr_not_found ; too big cluster number, something is wrong
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cmp eax,2
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jnb adr_data_cluster
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mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir
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cmp [fs_type],16
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jne adr_data_cluster
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mov eax,[ROOT_START]
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mov edx,[ROOT_SECTORS]
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mov [fat16_root],1 ; flag for fat16 rootdir
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jmp adr_new_sector
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adr_data_cluster:
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sub eax,2
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mov edx,[SECTORS_PER_CLUSTER]
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imul eax,edx
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add eax,[DATA_START]
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adr_new_sector:
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mov ebx,buffer
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call hd_read
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cmp [hd_error],0
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jne adr_not_found
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mov ecx,512/32 ; count of dir entrys per sector = 16
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adr_analyze:
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mov edi,[ebx+11] ; file attribute
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and edi,0xf
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cmp edi,0xf
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je adr_long_filename
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test edi,0x8 ; skip over volume label
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jne adr_long_filename ; Note: label can be same name as file/dir
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mov esi,[esp+0] ; filename need to be uppercase
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mov edi,ebx
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push ecx
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mov ecx,11
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cld
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rep cmpsb ; compare 8+3 filename
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pop ecx
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je adr_found
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adr_long_filename:
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add ebx,32 ; position of next dir entry
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dec ecx
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jnz adr_analyze
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mov ecx,[longname_sec1] ; save 2 previous directory sectors
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mov [longname_sec1],eax ; for delete long filename
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mov [longname_sec2],ecx
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inc eax ; next sector
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dec edx
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jne adr_new_sector
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cmp [fat16_root],1 ; end of fat16 rootdir
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je adr_not_found
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adr_next_cluster:
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mov eax,[cluster_tmp]
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call get_FAT ; get next cluster
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cmp [hd_error],0
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jne adr_not_found
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cmp eax,2 ; incorrect fat chain?
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jb adr_not_found ; yes
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cmp eax,[fatRESERVED] ; is it end of directory?
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jb adr_new_cluster ; no. analyse it
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adr_not_found:
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pop edi edi esi edx ecx ; first edi will remove ebx
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stc ; file not found
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ret
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adr_found:
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pop edi edi esi edx ecx ; first edi will remove ebx
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clc ; file found
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ret
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get_data_cluster:
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;-----------------------------------------------------------
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; input : EAX = cluster
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; EBX = pointer to buffer
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; EDX = # blocks to read in buffer
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; ESI = # blocks to skip over
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; output : if CARRY=0 ok EBX/EDX/ESI updated
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; if CARRY=1 cluster out of range
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; Note : if cluster=0 it's changed to read rootdir
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;-----------------------------------------------------------
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push eax ecx
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mov [fat16_root],0
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cmp eax,[LAST_CLUSTER]
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ja gdc_error ; too big cluster number, something is wrong
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cmp eax,2
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jnb gdc_cluster
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mov eax,[ROOT_CLUSTER] ; if cluster < 2 then read rootdir
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cmp [fs_type],16
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jne gdc_cluster
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mov eax,[ROOT_START]
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mov ecx,[ROOT_SECTORS] ; Note: not cluster size
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mov [fat16_root],1 ; flag for fat16 rootdir
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jmp gdc_read
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gdc_cluster:
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sub eax,2
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mov ecx,[SECTORS_PER_CLUSTER]
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imul eax,ecx
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add eax,[DATA_START]
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gdc_read:
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test esi,esi ; first wanted block
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je gdcl1 ; yes, skip count is 0
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dec esi
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jmp gdcl2
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gdcl1:
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call hd_read
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cmp [hd_error],0
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jne gdc_error
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add ebx,512 ; update pointer
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dec edx
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gdcl2:
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test edx,edx ; is all read?
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je out_of_read
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inc eax ; next sector
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dec ecx
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jnz gdc_read
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out_of_read:
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pop ecx eax
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clc
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ret
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gdc_error:
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pop ecx eax
|
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stc
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ret
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|
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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
|
|
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], 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], 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], 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], 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], 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], 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], 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
|
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@@:
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ret
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; \end{diamond}
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