File system: read files with long names (LFN)

git-svn-id: svn://kolibrios.org@71 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Evgeny Grechnikov (Diamond) 2006-04-24 14:28:05 +00:00
parent 12ecff7fb2
commit 7c7f68ee6f
5 changed files with 968 additions and 6 deletions

View File

@ -258,15 +258,12 @@ fileread:
call memmove
add [esp+8],dword 512
dec dword [esp+12] ; last wanted cluster ?
cmp [esp+12],dword 0
je frnoread
jmp frfl8
frfl7:
dec dword [esp+16]
frfl8:
shl edi,1 ;find next cluster from FAT
add edi,0x280000
movzx eax,word [edi]
movzx eax,word [edi*2+0x280000] ; find next cluster from FAT
mov edi,eax
cmp edi,4095 ;eof - cluster
jz frnoread2
@ -519,4 +516,339 @@ mov [edi+22],ax ; time
rd_getfileinfo_end:
xor eax,eax
add esp,32
ret
ret
; \begin{diamond}
uni2ansi_str:
; convert UNICODE zero-terminated string to ASCII-string (codepage 866)
; in: esi->source, edi->buffer (may be esi=edi)
; destroys: eax,esi,edi
lodsw
test ax, ax
jz .done
cmp ax, 0x80
jb .ascii
cmp ax, 0x401
jz .yo1
cmp ax, 0x451
jz .yo2
cmp ax, 0x410
jb .unk
cmp ax, 0x440
jb .rus1
cmp ax, 0x450
jb .rus2
.unk:
mov al, '_'
jmp .doit
.yo1:
mov al, 'ð'
jmp .doit
.yo2:
mov al, 'ñ'
jmp .doit
.rus1:
; 0x410-0x43F -> 0x80-0xAF
add al, 0x70
jmp .doit
.rus2:
; 0x440-0x450 -> 0xE0-0xEF
add al, 0xA0
.ascii:
.doit:
stosb
jmp uni2ansi_str
.done:
mov byte [edi], 0
ret
char_toupper:
; convert character to uppercase, using cp866 encoding
; in: al=symbol
; out: al=converted symbol
cmp al, 'a'
jb .ret
cmp al, 'z'
jbe .az
cmp al, ' '
jb .ret
cmp al, 'à'
jb .rus1
cmp al, 'ï'
ja .ret
; 0xE0-0xEF -> 0x90-0x9F
sub al, 'à'-'<27>'
.ret:
ret
.rus1:
; 0xA0-0xAF -> 0x80-0x8F
.az:
and al, not 0x20
ret
fat_get_name:
; in: edi->FAT entry
; out: CF=1 - no valid entry
; else CF=0 and ebp->ASCIIZ-name
; (maximum length of filename is 255 (wide) symbols without trailing 0,
; but implementation requires buffer 261 words)
; destroys eax
cmp byte [edi], 0
jz .no
cmp byte [edi], 0xE5
jnz @f
.no:
stc
ret
@@:
cmp byte [edi+11], 0xF
jz .longname
push ecx
mov ecx, 8
push edi ebp ecx
@@:
mov al, [edi]
inc edi
mov [ebp], al
inc ebp
loop @b
pop ecx
@@:
cmp byte [ebp-1], ' '
jnz @f
dec ebp
loop @b
@@:
mov byte [ebp], '.'
inc ebp
mov ecx, 3
push ecx
@@:
mov al, [edi]
inc edi
mov [ebp], al
inc ebp
loop @b
pop ecx
@@:
cmp byte [ebp-1], ' '
jnz @f
dec ebp
loop @b
dec ebp
@@:
and byte [ebp], 0 ; CF=0
pop ebp edi ecx
ret
.longname:
; LFN
mov al, byte [edi]
and eax, 0x3F
dec eax
cmp al, 20
jae .no ; ignore invalid entries
mov word [ebp+260*2], 0 ; force null-terminating for orphans
imul eax, 13*2
add ebp, eax
test byte [edi], 0x40
jz @f
mov word [ebp+13*2], 0
@@:
push eax
; now copy name from edi to ebp ...
mov eax, [edi+1]
mov [ebp], eax ; symbols 1,2
mov eax, [edi+5]
mov [ebp+4], eax ; 3,4
mov eax, [edi+9]
mov [ebp+8], ax ; 5
mov eax, [edi+14]
mov [ebp+10], eax ; 6,7
mov eax, [edi+18]
mov [ebp+14], eax ; 8,9
mov eax, [edi+22]
mov [ebp+18], eax ; 10,11
mov eax, [edi+28]
mov [ebp+22], eax ; 12,13
; ... done
pop eax
sub ebp, eax
test eax, eax
jz @f
; if this is not first entry, more processing required
stc
ret
@@:
; if this is first entry:
; buffer at ebp contains UNICODE name, convert it to ANSI
push esi edi
mov esi, ebp
mov edi, ebp
call uni2ansi_str
pop edi esi
clc
ret
fat_compare_name:
; compares ASCIIZ-names, case-insensitive (cp866 encoding)
; in: esi->name, ebp->name
; out: if names match: ZF=1 and esi->next component of name
; else: ZF=0, esi is not changed
; destroys eax
push ebp esi
.loop:
mov al, [ebp]
inc ebp
call char_toupper
push eax
lodsb
call char_toupper
cmp al, [esp]
jnz .done
pop eax
test al, al
jnz .loop
dec esi
pop eax
pop ebp
xor eax, eax ; set ZF flag
ret
.done:
cmp al, '/'
jnz @f
cmp byte [esp], 0
jnz @f
mov [esp+4], esi
@@:
pop eax
pop esi ebp
ret
rd_find_lfn:
; in: esi->name
; out: CF=1 - file not found
; else CF=0 and edi->direntry
push esi ebp edi
sub esp, 262*2 ; allocate space for LFN
mov ebp, esp ; ebp points to buffer
mov edi, 0x100000+512*19 ; to root dir
.l1:
call fat_get_name
jc .l2
call fat_compare_name
jz .found
.l2:
add edi, 0x20
cmp edi, 0x100000+512*33
jb .l1
.notfound:
add esp, 262*2
pop edi ebp esi
stc
ret
.found:
; found
; if this is LFN entry, advance to true entry
cmp byte [edi+11], 0xF
jnz @f
add edi, 0x20
@@:
; folders are not supported
cmp byte [esi], 0
jnz .notfound
add esp, 262*2+4 ; CF=0
pop ebp esi
ret
;----------------------------------------------------------------
;
; fs_RamdiskRead - LFN variant for reading sys floppy
;
; esi points to filename
; ebx pointer to 64-bit number = first wanted byte, 0+
; may be ebx=0 - start from first byte
; ecx number of bytes to read, 0+
; edx mem location to return data
;
; ret ebx = size or 0xffffffff file not found
; eax = 0 ok read or other = errormsg
;
;--------------------------------------------------------------
fs_RamdiskRead:
cmp byte [esi], 0
jnz @f
or ebx, -1
mov eax, 10 ; access denied
ret
@@:
push edi
call rd_find_lfn
jnc .found
pop edi
or ebx, -1
mov eax, 5 ; file not found
ret
.found:
test ebx, ebx
jz .l1
cmp dword [ebx+4], 0
jz @f
mov ebx, [edi+28]
.reteof:
mov eax, 6 ; EOF
pop edi
ret
@@:
mov ebx, [ebx]
.l1:
push dword [edi+28] ; file size
push dword [edi+28]
movzx edi, word [edi+26] ; cluster
push ecx edx
.new:
jecxz .done
test edi, edi
jz .eof
cmp edi, 0xFF8
jae .eof
lea eax, [edi+31] ; bootsector+2*fat+filenames
shl eax, 9 ; *512
add eax, 0x100000 ; image base
; now eax points to data of cluster
sub ebx, 512
jae .skip
lea eax, [eax+ebx+512]
neg ebx
push ecx
cmp ecx, ebx
jbe @f
mov ecx, ebx
@@:
cmp ecx, [esp+12]
jbe @f
mov ecx, [esp+12]
@@:
mov ebx, edx
call memmove
add edx, ecx
sub [esp], ecx
sub [esp+12], ecx
pop ecx
xor ebx, ebx
cmp [esp+8], ebx
jnz .skip
jecxz .done
jmp .eof
.skip:
movzx edi, word [edi*2+0x280000] ; find next cluster from FAT
jmp .new
.eof:
pop edx ecx ebx ebx
jmp .reteof
.done:
pop edx ecx ebx ebx edi
xor eax, eax
ret
; \end{diamond}

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@ -1082,3 +1082,183 @@ check_new_flp:
pop ebx
ret
; \begin{diamond}
fd_find_lfn:
; in: esi->name
; out: CF=1 - file not found
; else CF=0 and edi->direntry
pusha
sub esp, 262*2 ; reserve place for LFN
mov ebp, esp
call read_flp_fat
cmp [FDC_Status], 0
jnz .error
mov eax, 19
mov dh, 14
.main_loop:
.20_1:
pusha
call read_chs_sector
popa
cmp [FDC_Status], 0
jnz .error
mov edi, 0xD000
inc [FDD_Sector]
push eax
.21_1:
call fat_get_name
jc @f
call fat_compare_name
jz .found
@@:
add edi, 0x20
cmp edi, 0xD200
jb .21_1
pop eax
inc eax
dec dh
js @f
jnz .20_1
.error:
add esp, 262*2
popa
stc
ret
@@:
; read next sector from FAT
mov eax, [(eax-31)*2+0x282000]
and eax, 0xFFF
cmp eax, 0xFF8
jae .error
add eax, 31
jmp .main_loop
.found:
pop eax
; if LFN entry, advance to corresponding short entry
cmp byte [edi+11], 0xF
jnz .entryfound
add edi, 0x20
cmp edi, 0xD200
jb .entryfound
dec dh
jz .error
inc eax
call read_chs_sector
cmp [FDC_Status], 0
jnz .error
mov edi, 0xD000
.entryfound:
cmp byte [esi], 0
jz .done
test byte [edi+11], 10h ; is a directory?
jz .error
movzx eax, word [edi+26]
add eax, 31
mov dh, 0
jmp .main_loop
.done:
add esp, 262*2+4
push edi
popad
ret
;----------------------------------------------------------------
;
; fs_FloppyRead - LFN variant for reading floppy
;
; esi points to filename
; ebx pointer to 64-bit number = first wanted byte, 0+
; may be ebx=0 - start from first byte
; ecx number of bytes to read, 0+
; edx mem location to return data
;
; ret ebx = size or 0xffffffff file not found
; eax = 0 ok read or other = errormsg
;
;--------------------------------------------------------------
fs_FloppyRead:
mov [save_flag], 0
cmp byte [esi], 0
jnz @f
or ebx, -1
mov eax, 10 ; access denied
ret
@@:
push edi
call fd_find_lfn
jnc .found
pop edi
or ebx, -1
mov eax, 5 ; file not found
ret
.found:
test ebx, ebx
jz .l1
cmp dword [ebx+4], 0
jz @f
mov ebx, [edi+28]
.reteof:
mov eax, 6 ; EOF
pop edi
ret
@@:
mov ebx, [ebx]
.l1:
push dword [edi+28]
push dword [edi+28]
movzx edi, word [edi+26]
push ecx edx
.new:
jecxz .done
test edi, edi
jz .eof
cmp edi, 0xFF8
jae .eof
mov eax, edi
add eax, 31
pusha
call read_chs_sector
popa
cmp [FDC_Status], 0
jnz .err
sub ebx, 512
jae .skip
lea eax, [eax+ebx+512]
neg ebx
push ecx
cmp ecx, ebx
jbe @f
mov ecx, ebx
@@:
cmp ecx, [esp+12]
jbe @f
mov ecx, [esp+12]
@@:
mov ebx, edx
mov eax, 0xD000
call memmove
add edx, ecx
sub [esp], ecx
sub [esp+12], ecx
pop ecx
xor ebx, ebx
cmp [esp+8], ebx
jnz .skip
jecxz .done
jmp .eof
.skip:
movzx edi, word [edi*2+0x282000]
jmp .new
.done:
pop edx ecx ebx ebx edi
xor eax, eax
ret
.eof:
pop edx ecx ebx ebx
jmp .reteof
.err:
mov eax, 5 ; may be other error code?
pop edx ecx ebx ebx edi
ret
; \end{diamond}

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@ -8,6 +8,7 @@
;; ;;
;; See file COPYING for details ;;
;; ;;
;; 23.04.2006 LFN read - diamond ;;
;; 28.01.2006 find all Fat16/32 partition in all input point ;;
;; to MBR, see file part_set.inc - Mario79 ;;
;; 15.01.2005 get file size/attr/date, file_append - ATV ;;
@ -2577,3 +2578,239 @@ read_hd_file:
ret
; \begin{diamond}
hd_find_lfn:
; in: esi->name
; out: CF=1 - file not found
; else CF=0 and edi->direntry
pusha
sub esp, 262*2 ; allocate space for LFN
mov ebp, esp
mov eax, [ROOT_CLUSTER] ; start from root
.mainloop:
.new_cluster:
mov [cluster_tmp], eax
mov [fat16_root], 0
cmp eax, [LAST_CLUSTER]
ja .notfound
cmp eax, 2
jae .data_cluster
cmp [fat_type], 16
jnz .notfound
mov eax, [ROOT_START]
mov ecx, [ROOT_SECTORS]
mov [fat16_root], 1
jmp .new_sector
.data_cluster:
dec eax
dec eax
mov ecx, [SECTORS_PER_CLUSTER]
mul ecx
add eax, [DATA_START]
.new_sector:
mov ebx, buffer
call hd_read
mov edi, ebx
add ebx, 512
push eax
.l1:
call fat_get_name
jc .l2
call fat_compare_name
jz .found
.l2:
add edi, 0x20
cmp edi, ebx
jb .l1
pop eax
inc eax
loop .new_sector
cmp [fat16_root], 0
jnz .notfound
mov eax, [cluster_tmp]
call get_FAT
cmp eax, 2
jb .notfound
cmp eax, [fatRESERVED]
jb .new_cluster
.notfound:
add esp, 262*2
popa
stc
ret
.found:
pop eax
; if this is LFN entry, advance to true entry
cmp byte [edi+11], 0xF
jnz .entryfound
add edi, 0x20
cmp edi, ebx
jb .entryfound
inc eax
dec ecx
jnz .read_entry
cmp [fat16_root], 0
jnz .notfound
mov eax, [cluster_tmp]
call get_FAT
cmp eax, 2
jb .notfound
cmp eax, [fatRESERVED]
jae .notfound
dec eax
dec eax
mul [SECTORS_PER_CLUSTER]
add eax, [DATA_START]
.read_entry:
mov ebx, [buffer]
call hd_read
mov edi, ebx
.entryfound:
cmp byte [esi], 0
jz .done
test byte [edi+11], 10h ; is a directory?
jz .notfound
mov eax, [edi+20-2]
mov ax, [edi+26]
jmp .mainloop
.done:
add esp, 262*2+4 ; CF=0
push edi
popad
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 = size or 0xffffffff file not found
; eax = 0 ok read or other = errormsg
;
;--------------------------------------------------------------
fs_HdRead:
cmp [fat_type], 0
jnz @f
or ebx, -1
mov eax, ERROR_UNKNOWN_FS
ret
@@:
push edi
cmp byte [esi], 0
jnz @f
.noaccess:
pop edi
or ebx, -1
mov eax, ERROR_ACCESS_DENIED
ret
@@:
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 directories
jnz .noaccess
test ebx, ebx
jz .l1
cmp dword [ebx+4], 0
jz @f
mov ebx, [edi+28]
.reteof:
mov eax, 6
pop edi
ret
@@:
mov ebx, [ebx]
.l1:
push dword [edi+28] ; file size
mov eax, [edi+20-2]
mov ax, [edi+26]
push ecx edx
push dword [edi+28]
; 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
cmp dword [esp], 512
jb .force_buf
; we may read directly to given buffer
push ebx
mov ebx, edx
call hd_read
pop ebx
add edx, 512
sub ecx, 512
sub dword [esp], 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
add eax, ebx
push ecx
add ecx, ebx
cmp ecx, 512
jbe @f
mov ecx, 512
@@:
sub ecx, ebx
cmp ecx, [esp+8]
jbe @f
mov ecx, [esp+8]
@@:
mov ebx, edx
call memmove
add edx, ecx
sub [esp], ecx
sub [esp+8], ecx
pop ecx
pop eax
xor ebx, ebx
cmp [esp], ebx
jnz .skip
jecxz .done
jmp .eof
.skip:
inc eax
dec edi
jnz .new_sector
mov eax, [cluster_tmp]
call get_FAT
jmp .new_cluster
.done:
pop ebx edx ecx ebx edi
xor eax, eax
ret
.eof:
pop ebx edx ecx ebx
jmp .reteof
; \end{diamond}

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@ -3,6 +3,7 @@
;; System service for filesystem call ;;
;; (C) 2004 Ville Turjanmaa, License: GPL ;;
;; ;;
;; xx.04.2006 LFN support - diamond ;;
;; 15.01.2005 get file size/attr/date, file_append (only for hd) - ATV ;;
;; 23.11.2004 test if hd/partition is set - ATV ;;
;; 18.11.2004 get_disk_info and more error codes - ATV ;;
@ -49,7 +50,7 @@ file_system:
;
; eax = 0 : read ok
; eax = 1 : no hd base and/or partition defined
; eax = 2 : yet unsupported FS
; eax = 2 : function is unsupported for this FS
; eax = 3 : unknown FS
; eax = 4 : partition not defined at hd
; eax = 5 : file not found
@ -86,6 +87,10 @@ file_system:
; Extract parameters
add eax, std_application_base_address ; abs start of info block
; \begin{diamond}
cmp byte [eax+1], 1
jz file_system_lfn
; \end{diamond}
cmp dword [eax+0],12 ; Get file size
je fs_read
@ -1126,3 +1131,5 @@ err:
partition_string: dd 0
db 32
include 'fs_lfn.inc'

206
kernel/trunk/fs/fs_lfn.inc Normal file
View File

@ -0,0 +1,206 @@
; System function 58, subfunctions 1xx
; diamond, 2006
iglobal
; in this table names must be in lowercase
rootdirs:
db 2,'rd'
dd fs_OnRamdisk
db 7,'ramdisk'
dd fs_OnRamdisk
db 2,'fd'
dd fs_OnFloppy
db 10,'floppydisk'
dd fs_OnFloppy
db 3,'hd0'
dd fs_OnHd0
db 3,'hd1'
dd fs_OnHd1
db 3,'hd2'
dd fs_OnHd2
db 3,'hd3'
dd fs_OnHd3
db 0
endg
file_system_lfn:
; in: eax->fileinfo block
; operation codes:
; 0x100 : read file
; 0x101 : rewrite file - not implemented yet
; 0x102 : delete file - not implemented yet
; 0x103 : write/append to file - not implemented yet
; 0x104 : create directory - not implemented yet
; 0x105 : rename file/directory - not implemented yet
; 0x106 : get file attributes structure - not implemented yet
; 0x107 : start application - not implemented yet
; 0x108 : find file with mask - not implemented yet
; parse file name
xchg ebx, eax
lea esi, [ebx+20]
lodsb
cmp al, '/'
jz @f
.notfound:
mov dword [esp+36], 5 ; file not found
ret
@@:
cmp byte [esi], 0
jz .rootdir
mov edi, rootdirs-4
xor ecx, ecx
push esi
.scan1:
pop esi
add edi, ecx
scasd
mov cl, byte [edi]
jecxz .notfound
inc edi
push esi
@@:
lodsb
or al, 20h
scasb
loopz @b
jnz .scan1
pop eax
lodsb
cmp al, '/'
jz .found1
test al, al
jnz .scan1
; directory /xxx
.maindir:
; directory /
.rootdir:
mov dword [esp+36], 10 ; access denied
ret
.found1:
cmp byte [esi], 0
jz .maindir
mov ebp, dword [edi] ; handler for this device
; read partition number
xor ecx, ecx
xor eax, eax
@@:
lodsb
cmp al, '/'
jz .done1
test al, al
jz .done1
sub al, '0'
cmp al, 9
ja .notfound
imul ecx, 10
add ecx, eax
jmp @b
.done1:
test ecx, ecx
jz .notfound
test al, al
jnz @f
dec esi
@@:
; now ebp contains handler address, ecx - partition number, esi points to ASCIIZ string - rest of name
jmp ebp
; handlers for devices
; in: ecx = partition number
; esi -> relative (for device) name
; ebx -> fileinfo
; out: [esp+36]=image of eax, [esp+24]=image of ebx
fs_OnRamdisk:
cmp ecx, 1
jnz file_system_lfn.notfound
movzx eax, byte [ebx]
test eax, eax
jnz .not_impl
mov ecx, [ebx+12]
mov edx, [ebx+16]
add edx, std_application_base_address
add ebx, 4
call dword [fs_RamdiskServices + eax*4]
mov [esp+36], eax
mov [esp+24], ebx
ret
.not_impl:
mov dword [esp+36], 2 ; not implemented
ret
fs_RamdiskServices:
dd fs_RamdiskRead
fs_OnFloppy:
cmp ecx, 2
ja file_system_lfn.notfound
movzx eax, byte [ebx]
test eax, eax
jnz fs_OnRamdisk.not_impl
call reserve_flp
mov [flp_number], cl
mov ecx, [ebx+12]
mov edx, [ebx+16]
add edx, std_application_base_address
add ebx, 4
call dword [fs_FloppyServices + eax*4]
and [flp_status], 0
mov [esp+36], eax
mov [esp+24], ebx
ret
fs_FloppyServices:
dd fs_FloppyRead
fs_OnHd0:
call reserve_hd1
mov [hdbase], 0x1F0
mov [hdid], 0
push 1
jmp fs_OnHd
fs_OnHd1:
call reserve_hd1
mov [hdbase], 0x1F0
mov [hdid], 0x10
push 2
jmp fs_OnHd
fs_OnHd2:
call reserve_hd1
mov [hdbase], 0x170
mov [hdid], 0
push 3
jmp fs_OnHd
fs_OnHd3:
call reserve_hd1
mov [hdbase], 0x170
mov [hdid], 0x10
push 4
fs_OnHd:
pop eax
mov [hdpos], eax
cmp ecx, [0x40001+eax]
jbe @f
and [hd1_status], 0
mov dword [esp+36], 5 ; not found
ret
@@:
mov [fat32part], ecx
push ebx esi
call choice_necessity_partition_1
pop esi ebx
mov ecx, [ebx+12]
mov edx, [ebx+16]
add edx, std_application_base_address
movzx eax, byte [ebx]
add ebx, 4
call dword [fs_HdServices + eax*4]
and [hd1_status], 0
mov [esp+36], eax
mov [esp+24], ebx
ret
fs_HdServices:
dd fs_HdRead