From a66ba0a1e000e2fc17515b80f5ba22935e3b3901 Mon Sep 17 00:00:00 2001 From: pathoswithin Date: Tue, 28 Feb 2017 12:33:45 +0000 Subject: [PATCH] fat: get volume info git-svn-id: svn://kolibrios.org@6868 a494cfbc-eb01-0410-851d-a64ba20cac60 --- kernel/trunk/fs/fat.inc | 208 +++++++++++++++++++++++----------------- 1 file changed, 118 insertions(+), 90 deletions(-) diff --git a/kernel/trunk/fs/fat.inc b/kernel/trunk/fs/fat.inc index cfaa7bdae2..9413b5c1d0 100644 --- a/kernel/trunk/fs/fat.inc +++ b/kernel/trunk/fs/fat.inc @@ -78,6 +78,7 @@ fat_in_cache dd ? ; there is how work was done before my edits, and I'm just keeping the principle. fat_cache_ptr dd ? fat12_unpacked_ptr dd ? +volumeLabel rb 12 buffer rb 512 fsinfo_buffer rb 512 ends @@ -199,12 +200,16 @@ fat_create_partition: dec eax ; cluster count jz .free_return0 mov [ebp+FAT.fatStartScan], 2 -; limits by Microsoft Hardware White Paper v1.03 - cmp eax, 0xff5 - jb .fat12 cmp eax, 0xfff5 jb .fat16 .fat32: + pusha + lea esi, [ebx+71] + lea edi, [ebp+FAT.volumeLabel] + movsd + movsd + movsd + popa mov eax, [ebx+0x2c] ; rootdir cluster mov [ebp+FAT.ROOT_CLUSTER], eax movzx eax, word [ebx+0x30] @@ -238,6 +243,15 @@ fat_create_partition: ret .fat16: + pusha + lea esi, [ebx+43] + lea edi, [ebp+FAT.volumeLabel] + movsd + movsd + movsd + popa + cmp eax, 0xff5 + jb .fat12 and [ebp+FAT.ROOT_CLUSTER], 0 mov [ebp+FAT.fatRESERVED], 0x0000FFF6 mov [ebp+FAT.fatBAD], 0x0000FFF7 @@ -912,23 +926,23 @@ fat_unlock: jmp mutex_unlock fat_get_name: -; in: edi -> FAT entry -; out: ebp -> UTF-16 name, CF=1 -> no valid entry +; in: edi -> FAT entry, esi -> buffer for UTF-16 name +; out: CF=1 -> no valid entry cmp byte [edi], 0 jz .no cmp byte [edi], 0xE5 jz .no cmp byte [edi+11], 0xF jz .longname - test byte [edi+11], 8 - jnz .no - push ecx esi edi - mov esi, edi - mov edi, ebp - mov ecx, 8 + push edi + xchg esi, edi + test byte [esi+11], 8 + jnz .label + pushd ecx 8 + pop ecx + xor eax, eax @@: lodsb - call ansi2uni_char stosw loop @b mov cl, 8 @@ -943,7 +957,6 @@ fat_get_name: mov cl, 3 @@: lodsb - call ansi2uni_char stosw loop @b mov cl, 3 @@ -955,9 +968,15 @@ fat_get_name: sub edi, 2 @@: and word [edi], 0 ; CF=0 - pop edi esi ecx + pop ecx edi ret +.label: + lea edi, [ebp+FAT.volumeLabel] + movsd + movsd + movsd + pop edi .no: stc ret @@ -968,50 +987,73 @@ fat_get_name: dec eax cmp al, 20 jae .no ; ignore invalid entries - mov word [ebp+260*2], 0 ; force null-terminating for orphans + mov word [esi+260*2], 0 ; force null-terminating for orphans imul eax, 13*2 test byte [edi], 0x40 jz @f - mov word [ebp+eax+13*2], 0 + mov word [esi+eax+13*2], 0 @@: ; copy name (13 chars in UTF-16) - push esi edi - lea esi, [edi+1] - lea edi, [ebp+eax] + push edi + inc edi + add esi, eax + xchg esi, edi movsd movsd - movsd - inc esi - sub edi, 2 + movsw + add esi, 3 movsd movsd movsd add esi, 2 movsd - pop edi esi + pop edi test eax, eax jnz .no ; if this is not first entry, more processing required ret -fat_compare_name: -; in: esi -> name in UTF-8, ebp -> name in UTF-16 +fat_find_lfn: +; in: +; esi -> path in UTF-8 +; parameters in the stack ; out: -; ZF=1 -> names match, esi -> next component of name -; ZF=0 -> esi is not changed - push ebp esi +; esi -> next name in the path +; edi -> direntry +; CF=1 -> file not found, eax = error code + lea eax, [esp+12] + call dword [eax-4] + jc .reterr + sub esp, 262*2 ; reserve place for LFN +.l1: + push esi + lea esi, [esp+4] + call fat_get_name + pop esi + jc .no + push edi esi + lea edi, [esp+8] @@: call utf8to16 call utf16toUpper mov edx, eax - mov ax, [ebp] + mov ax, [edi] call utf16toUpper cmp ax, dx jnz .done - add ebp, 2 + add edi, 2 test ax, ax jnz @b dec esi - pop eax ebp - xor eax, eax ; set ZF + pop eax edi +.found: + add esp, 262*2 +; if this is LFN entry, advance to true entry + cmp byte [edi+11], 0xF + jnz @f + lea eax, [esp+12] + call dword[eax-8] + jc .reterr +@@: + xor eax, eax ret .done: @@ -1021,53 +1063,15 @@ fat_compare_name: jnz @f mov [esp], esi @@: - pop esi ebp - ret - -fat_find_lfn: -; in: esi -> name in UTF-8 -; [esp+4] = next -; [esp+8] = first -; [esp+C]... - possibly parameters for first and next -; out: CF=1 - file not found, eax=error code -; else CF=0, esi->next name component, edi->direntry - pusha - lea eax, [esp+0Ch+20h] - call dword [eax-4] - jc .reterr - sub esp, 262*2 ; reserve place for LFN -.l1: - lea ebp, [esp] - call fat_get_name - jc .l2 - call fat_compare_name + pop esi edi jz .found -.l2: - mov ebp, [esp+8+262*2] - lea eax, [esp+0Ch+20h+262*2] - call dword [eax-8] +.no: + lea eax, [esp+262*2+12] + call dword[eax-8] jnc .l1 add esp, 262*2 .reterr: - mov [esp+28], eax stc - popa - ret - -.found: - add esp, 262*2 - mov ebp, [esp+8] -; if this is LFN entry, advance to true entry - cmp byte [edi+11], 0xF - jnz @f - lea eax, [esp+0Ch+20h] - call dword [eax-8] - jc .reterr -@@: - add esp, 8 ; CF=0 - push esi - push edi - popa ret fat_time_to_bdfe: @@ -1475,7 +1479,6 @@ fat_ReadFolder: mov eax, [edi+20-2] mov ax, [edi+26] ; eax=cluster .doit: - push esi sub esp, 262*2 ; reserve space for LFN push dword [ebx+8] ; cp866/UNICODE name mov edx, [ebx+16] ; pointer to buffer @@ -1519,10 +1522,10 @@ fat_ReadFolder: add ebx, 512 push eax .l1: - push ebp - lea ebp, [esp+20] + push esi + lea esi, [esp+20] call fat_get_name - pop ebp + pop esi jc .l2 cmp byte [edi+11], 0xF jnz .do_bdfe @@ -1600,12 +1603,12 @@ fat_ReadFolder: .notfound2: add esp, 8 .notfound: - add esp, 262*2+8 + add esp, 262*2+4 push ERROR_DEVICE jmp @f .done: - add esp, 262*2+16 + add esp, 262*2+12 pushd 0 dec ecx js @f @@ -1961,11 +1964,9 @@ fat_CreateFile: @@: cmp eax, [ebp+FAT.fatRESERVED] jae .done1 - push edx xor edx, edx call set_FAT mov eax, edx - pop edx jc .done1 inc ecx jmp @b @@ -2218,10 +2219,8 @@ fat_CreateFile: lea eax, [esp+16+8] call dword [eax+16] ; flush directory pop eax - push edx mov edx, [ebp+FAT.fatEND] call set_FAT - pop edx .write_cluster: push eax dec eax @@ -2306,13 +2305,11 @@ fat_CreateFile: mov ecx, eax call get_free_FAT jc .diskfull - push edx mov edx, [ebp+FAT.fatEND] call set_FAT xchg eax, ecx mov edx, ecx call set_FAT - pop edx xchg eax, ecx jmp .write_cluster @@ -2909,10 +2906,7 @@ fat_SetFileEnd: ;---------------------------------------------------------------- fat_GetFileInfo: cmp byte [esi], 0 - jnz @f - mov eax, 2 - ret -@@: + jz .volume call fat_lock call hd_find_lfn jc @f @@ -2929,6 +2923,40 @@ fat_GetFileInfo: pop eax ret +.volume: + mov eax, dword[ebp+FAT.Length] + mov edx, dword[ebp+FAT.Length+4] + mov edi, [ebx+16] + shld edx, eax, 9 + shl eax, 9 + mov [edi+36], edx + mov [edi+32], eax + mov eax, [ebx+8] + mov byte [edi], 8 + mov [edi+4], eax + lea esi, [ebp+FAT.volumeLabel] + mov ecx, 11 +@@: + mov byte [esi+ecx], 0 + dec ecx + jz @f + cmp byte [esi+ecx], ' ' + jz @b +@@: + mov cl, 12 + add edi, 40 + cmp eax, 2 + jz @f + rep movsb + xor eax, eax + ret + +@@: + lodsb + stosw + loop @b + ret + ;---------------------------------------------------------------- fat_SetFileInfo: call fat_lock