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kolibrios/kernel/trunk/fs/iso9660.inc
Marat Zakiyanov (Mario79) 4a1560020b Added: 
1) Low level procedures for СD device: read sector, load tray, out tray;
2) Function 70/0 for ISO9660 - read file
2) Function 70/0 for ISO9660 - read directory in format of standard 1.


git-svn-id: svn://kolibrios.org@87 a494cfbc-eb01-0410-851d-a64ba20cac60
2006-06-18 16:42:03 +00:00

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uglobal
cd_current_pointer_of_input dd 0
cd_current_pointer_of_input_2 dd 0
cd_mem_location dd 0
cd_counter_block dd 0
endg
CDDataBuf equ 0x7000
reserve_cd:
cli
cmp [cd_status],0
je reserve_ok2
sti
call change_task
jmp reserve_hd1
reserve_ok2:
push eax
mov eax,[0x3000]
shl eax,5
mov eax,[eax+0x3000+4]
mov [cd_status],eax
pop eax
sti
ret
cd_status dd 0
;----------------------------------------------------------------
;
; fs_CdRead - LFN variant for reading CD disk
;
; esi points to filename /dir1/dir2/.../dirn/file,0
; 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_CdRead:
push edi
cmp byte [esi], 0
jnz @f
.noaccess:
pop edi
.noaccess_2:
or ebx, -1
mov eax, ERROR_ACCESS_DENIED
ret
.noaccess_3:
pop eax edx ecx edi
jmp .noaccess_2
@@:
call cd_find_lfn
jnc .found
pop edi
cmp [DevErrorCode],0
jne .noaccess_2
or ebx, -1
mov eax, ERROR_FILE_NOT_FOUND
ret
.found:
mov edi,[cd_current_pointer_of_input]
test byte [edi+25],10b ; 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 ; end of file
pop edi
ret
@@:
mov ebx, [ebx]
.l1:
push ecx edx
push 0
mov eax, [edi+10] ; ðåàëüíûé ðàçìåð ôàéëîâîé ñåêöèè
sub eax, ebx
jb .eof
cmp eax, ecx
jae @f
mov ecx, eax
mov byte [esp], 6
@@:
mov eax,[edi+2]
mov [CDSectorAddress],eax
; now eax=cluster, ebx=position, ecx=count, edx=buffer for data
.new_sector:
test ecx, ecx
jz .done
sub ebx, 2048
jae .new_sector
add ebx, 2048
jnz .incomplete_sector
cmp ecx, 2048
jb .incomplete_sector
; we may read and memmove complete sector
mov [CDDataBuf_pointer],edx
call ReadCDWRetr ; ÷èòàåì ñåêòîð ôàéëà
cmp [DevErrorCode],0
jne .noaccess_3
inc dword [CDSectorAddress]
add edx, 2048
sub ecx, 2048
jmp .new_sector
.incomplete_sector:
; we must read and memmove incomplete sector
mov [CDDataBuf_pointer],CDDataBuf
call ReadCDWRetr ; ÷èòàåì ñåêòîð ôàéëà
cmp [DevErrorCode],0
jne .noaccess_3
inc dword [CDSectorAddress]
mov eax,CDDataBuf
add eax, ebx
push ecx
add ecx, ebx
cmp ecx, 2048
jbe @f
mov ecx, 2048
@@:
sub ecx, ebx
push edi esi ecx
mov edi,edx
mov esi,eax ;0x7000 ; CD data buffer
cld
rep movsb
pop ecx esi edi
add edx, ecx
sub [esp], ecx
pop ecx
xor ebx, ebx
jmp .new_sector
.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_CdReadFolder - LFN variant for reading CD disk folder
;
; esi points to filename /dir1/dir2/.../dirn/file,0
; 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_CdReadFolder:
push edi
call cd_find_lfn
jnc .found
pop edi
cmp [DevErrorCode],0
jne .noaccess_1
or ebx, -1
mov eax, ERROR_FILE_NOT_FOUND
ret
.found:
mov edi,[cd_current_pointer_of_input]
test byte [edi+25],10b ; do not allow read directories
jnz .found_dir
pop edi
.noaccess_1:
or ebx, -1
mov eax, ERROR_ACCESS_DENIED
ret
.found_dir:
mov eax,[edi+2] ; eax=cluster
mov [CDSectorAddress],eax
mov eax,[edi+10] ; ðàçìåð äèðåêòðîðèè
.doit:
; 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 [cd_mem_location],edx
add [cd_mem_location],32
; íà÷èíàåì ïåðåáðîñêó ÁÄÂÊ â ÓÑÂÊ
;.mainloop:
mov [cd_counter_block],dword 0
dec dword [CDSectorAddress]
push ecx
.read_to_buffer:
inc dword [CDSectorAddress]
mov [CDDataBuf_pointer],CDDataBuf
call ReadCDWRetr ; ÷èòàåì ñåêòîð äèðåêòîðèè
cmp [DevErrorCode],0
jne .noaccess_1
call .get_names_from_buffer
sub eax,2048
; äèðåêòîðèÿ çàêîí÷èëàñü?
cmp eax,0
jg .read_to_buffer
mov edi,[cd_counter_block]
mov [edx+8],edi
mov edi,[ebx]
sub [edx+4],edi
pop ecx edi
xor ebx,ebx
mov eax,ERROR_SUCCESS
ret
.get_names_from_buffer:
mov [cd_current_pointer_of_input_2],CDDataBuf
push eax esi edi edx
.get_names_from_buffer_1:
call cd_get_name
jc .end_buffer
inc dword [cd_counter_block]
mov eax,[cd_counter_block]
cmp [ebx],eax
jae .get_names_from_buffer_1
test ecx, ecx
jz .get_names_from_buffer_1
mov edi,[cd_counter_block]
mov [edx+4],edi
dec ecx
mov esi,ebp
mov edi,[cd_mem_location]
add edi,40
test dword [ebx+4], 1 ; 0=ANSI, 1=UNICODE
jnz .unicode
; jmp .unicode
.ansi:
cmp [cd_counter_block],2
jbe .ansi_parent_directory
cld
lodsw
xchg ah,al
call uni2ansi_char
cld
stosb
; ïðîâåðêà êîíöà ôàéëà
mov al,[esi+1]
cmp al,byte 3Bh ; ñåïàðàòîð êîíöà ôàéëà ';'
je .cd_get_parameters_of_file_1
; ïðîâåðêà äëÿ ôàéëîâ íå çàêàí÷èâàþùèõñÿ ñåïàðàòîðîì
movzx eax,byte [ebp-33]
add eax,ebp
sub eax,34
cmp esi,eax
je .cd_get_parameters_of_file_1
; ïðîâåðêà êîíöà ïàïêè
movzx eax,byte [ebp-1]
add eax,ebp
cmp esi,eax
jb .ansi
.cd_get_parameters_of_file_1:
mov [edi],byte 0
call .cd_get_parameters_of_file
add [cd_mem_location],304
jmp .get_names_from_buffer_1
.ansi_parent_directory:
cmp [cd_counter_block],2
je @f
mov [edi],byte '.'
inc edi
jmp .cd_get_parameters_of_file_1
@@:
mov [edi],word '..'
add edi,2
jmp .cd_get_parameters_of_file_1
.unicode:
cmp [cd_counter_block],2
jbe .unicode_parent_directory
cld
movsw
; ïðîâåðêà êîíöà ôàéëà
mov ax,[esi]
cmp ax,word 3B00h ; ñåïàðàòîð êîíöà ôàéëà ';'
je .cd_get_parameters_of_file_2
; ïðîâåðêà äëÿ ôàéëîâ íå çàêàí÷èâàþùèõñÿ ñåïàðàòîðîì
movzx eax,byte [ebp-33]
add eax,ebp
sub eax,34
cmp esi,eax
je .cd_get_parameters_of_file_2
; ïðîâåðêà êîíöà ïàïêè
movzx eax,byte [ebp-1]
add eax,ebp
cmp esi,eax
jb .unicode
.cd_get_parameters_of_file_2:
mov [edi],word 0
call .cd_get_parameters_of_file
add [cd_mem_location],560
jmp .get_names_from_buffer_1
.unicode_parent_directory:
cmp [cd_counter_block],2
je @f
mov [edi],word 2E00h ; '.'
add edi,2
jmp .cd_get_parameters_of_file_2
@@:
mov [edi],dword 2E002E00h ; '..'
add edi,4
jmp .cd_get_parameters_of_file_2
.cd_get_parameters_of_file:
mov edi,[cd_mem_location]
; ïîëó÷àåì àòðèáóòû ôàéëà
xor eax,eax
; ôàéë íå àðõèâèðîâàëñÿ
inc al
shl eax,1
; ýòî êàòàëîã?
test [ebp-8],byte 2
jz .file
inc al
.file:
; ìåòêà òîìà íå êàê â FAT, â ýòîì âèäå îòñóòñâóåò
; ôàéë íå ÿâëÿåòñÿ ñèñòåìíûì
shl eax,3
; ôàéë ÿâëÿåòñÿ ñêðûòûì? (àòðèáóò ñóùåñòâîâàíèå)
test [ebp-8],byte 1
jz .hidden
inc al
.hidden:
shl eax,1
; ôàéë âñåãäà òîëüêî äëÿ ÷òåíèÿ, òàê êàê ýòî CD
inc al
mov [edi],eax
; ïîëó÷àåì âðåìÿ äëÿ ôàéëà
;÷àñ
movzx eax,byte [ebp-12]
shl eax,8
;ìèíóòà
mov al,[ebp-11]
shl eax,8
;ñåêóíäà
mov al,[ebp-10]
;âðåìÿ ñîçäàíèÿ ôàéëà
mov [edi+8],eax
;âðåìÿ ïîñëåäíåãî äîñòóïà
mov [edi+16],eax
;âðåìÿ ïîñëåäíåé çàïèñè
mov [edi+24],eax
; ïîëó÷àåì äàòó äëÿ ôàéëà
;ãîä
movzx eax,byte [ebp-15]
add eax,1900
shl eax,8
;ìåñÿö
mov al,[ebp-14]
shl eax,8
;äåíü
mov al,[ebp-13]
;äàòà ñîçäàíèÿ ôàéëà
mov [edi+12],eax
;âðåìÿ ïîñëåäíåãî äîñòóïà
mov [edi+20],eax
;âðåìÿ ïîñëåäíåé çàïèñè
mov [edi+28],eax
; ïîëó÷àåì òèï äàííûõ èìåíè
xor eax,eax
test dword [ebx+4], 1 ; 0=ANSI, 1=UNICODE
jnz .unicode_1
mov [edi+4],eax
jmp @f
.unicode_1:
inc eax
mov [edi+4],eax
@@:
; ïîëó÷àåì ðàçìåð ôàéëà â áàéòàõ
xor eax,eax
mov [edi+32+4],eax
mov eax,[ebp-23]
mov [edi+32],eax
ret
.end_buffer:
pop edx edi esi eax
ret
cd_find_lfn:
; in: esi->name
; out: CF=1 - file not found
; else CF=0 and [cd_current_pointer_of_input] direntry
push eax esi
; 16 ñåêòîð íà÷àëî íàáîðà äåñêðèïòîðîâ òîìîâ
mov [CDSectorAddress],dword 15
.start:
inc dword [CDSectorAddress]
mov [CDDataBuf_pointer],CDDataBuf
call ReadCDWRetr
cmp [DevErrorCode],0
jne .access_denied
; ïðîâåðêà íà âøèâîñòü
cmp [CDDataBuf+1],dword 'CD00'
jne .access_denied
cmp [CDDataBuf+5],byte '1'
jne .access_denied
; ñåêòîð ÿâëÿåòñÿ òåðìèíàòîðîì íàáîð äåñêðèïòîðîâ òîìîâ?
cmp [CDDataBuf],byte 0xff
je .access_denied
; ñåêòîð ÿâëÿåòñÿ äîïîëíèòåëüíûì è óëó÷øåííûì äåñêðèïòîðîì òîìà?
cmp [CDDataBuf],byte 0x2
jne .start
; ñåêòîð ÿâëÿåòñÿ äîïîëíèòåëüíûì äåñêðèïòîðîì òîìà?
cmp [CDDataBuf+6],byte 0x1
jne .start
; ïàðàìåòðû root äèðåêòðîðèè
mov eax,[CDDataBuf+0x9c+2] ; íà÷àëî root äèðåêòðîðèè
mov [CDSectorAddress],eax
mov eax,[CDDataBuf+0x9c+10] ; ðàçìåð root äèðåêòðîðèè
cmp byte [esi], 0
jnz @f
mov [cd_current_pointer_of_input],CDDataBuf+0x9c
jmp .done
@@:
; íà÷èíàåì ïîèñê
.mainloop:
dec dword [CDSectorAddress]
.read_to_buffer:
inc dword [CDSectorAddress]
mov [CDDataBuf_pointer],CDDataBuf
call ReadCDWRetr ; ÷èòàåì ñåêòîð äèðåêòîðèè
cmp [DevErrorCode],0
jne .access_denied
call cd_find_name_in_buffer
jnc .found
sub eax,2048
; äèðåêòîðèÿ çàêîí÷èëàñü?
cmp eax,0
jg .read_to_buffer
; íåò èñêîìîãî ýëåìåíòà öåïî÷êè
.access_denied:
pop esi eax
stc
ret
; èñêîìûé ýëåìåíò öåïî÷êè íàéäåí
.found:
; êîíåö ïóòè ôàéëà
cmp byte [esi], 0
jz .done
mov eax,[cd_current_pointer_of_input]
add eax,2
mov eax,[eax]
mov [CDSectorAddress],eax ; íà÷àëî äèðåêòîðèè
add eax,8
mov eax,[eax] ; ðàçìåð äèðåêòîðèè
jmp .mainloop
; óêàçàòåëü ôàéëà íàéäåí
.done:
pop esi eax
clc
ret
cd_find_name_in_buffer:
mov [cd_current_pointer_of_input_2],CDDataBuf
.start:
call cd_get_name
jc .not_found
call cd_compare_name
jc .start
.found:
clc
ret
.not_found:
stc
ret
cd_get_name:
push eax
mov ebp,[cd_current_pointer_of_input_2]
mov [cd_current_pointer_of_input],ebp
mov eax,[ebp]
cmp eax,0 ; âõîäû çàêîí÷èëèñü?
je .next_sector
cmp ebp,CDDataBuf+2048 ; áóôåð çàêîí÷èëñÿ?
jae .next_sector
movzx eax, byte [ebp]
add [cd_current_pointer_of_input_2],eax ; ñëåäóþùèé âõîä êàòàëîãà
add ebp,33 ; óêàçàòåëü óñòàíîâëåí íà íà÷àëî èìåíè
pop eax
clc
ret
.next_sector:
pop eax
stc
ret
cd_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 esi eax edi
mov edi,ebp
.loop:
cld
lodsb
push ax
call char_toupper
call ansi2uni_char
xchg ah,al
cld
scasw
pop ax
je .coincides
call char_todown
call ansi2uni_char
xchg ah,al
cld
sub edi,2
scasw
jne .name_not_coincide
.coincides:
cmp [esi],byte '/' ; ðàçäåëèòåëü ïóòè, êîíåö èìåíè òåêóùåãî ýëåìåíòà
je .done
cmp [esi],byte 0 ; ðàçäåëèòåëü ïóòè, êîíåö èìåíè òåêóùåãî ýëåìåíòà
je .done
jmp .loop
.name_not_coincide:
pop edi eax esi
stc
ret
.done:
; ïðîâåðêà êîíöà ôàéëà
cmp [edi],word 3B00h ; ñåïàðàòîð êîíöà ôàéëà ';'
je .done_1
; ïðîâåðêà äëÿ ôàéëîâ íå çàêàí÷èâàþùèõñÿ ñåïàðàòîðîì
movzx eax,byte [ebp-33]
add eax,ebp
sub eax,34
cmp edi,eax
je .done_1
; ïðîâåðêà êîíöà ïàïêè
movzx eax,byte [ebp-1]
add eax,ebp
cmp edi,eax
jne .name_not_coincide
.done_1:
pop edi eax
add esp,4
inc esi
clc
ret
char_todown:
; 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, '<27>'
jb .rus1
cmp al, 'Ÿ'
ja .ret
; 0x90-0x9F -> 0xE0-0xEF
add al, 'à'-'<27>'
.ret:
ret
.rus1:
; 0x80-0x8F -> 0xA0-0xAF
.az:
add al, 0x20
ret
uni2ansi_char:
; convert UNICODE character in al to ANSI character in ax, using cp866 encoding
; in: ax=UNICODE character
; out: al=converted ANSI character
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:
; 0x440-0x44F -> 0xE0-0xEF
add al, 0xA0
.ascii:
.doit:
ret
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