forked from KolibriOS/kolibrios
1598 lines
39 KiB
PHP
1598 lines
39 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; RAMDISK functions ;;
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;; (C) 2004 Ville Turjanmaa, License: GPL ;;
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;; Addings by M.Lisovin ;;
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;; LFN support by diamond ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; calculate fat chain
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calculatefatchain:
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pushad
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mov esi,0x100000+512
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mov edi,0x280000
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fcnew:
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mov eax,dword [esi]
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mov ebx,dword [esi+4]
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mov ecx,dword [esi+8]
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mov edx,ecx
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shr edx,4 ;8 ok
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shr dx,4 ;7 ok
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xor ch,ch
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shld ecx,ebx,20 ;6 ok
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shr cx,4 ;5 ok
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shld ebx,eax,12
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and ebx,0x0fffffff ;4 ok
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shr bx,4 ;3 ok
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shl eax,4
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and eax,0x0fffffff ;2 ok
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shr ax,4 ;1 ok
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mov dword [edi],eax
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mov dword [edi+4],ebx
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mov dword [edi+8],ecx
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mov dword [edi+12],edx
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add edi,16
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add esi,12
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cmp edi,0x280000+2856*2 ;2849 clusters
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jnz fcnew
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popad
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ret
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restorefatchain: ; restore fat chain
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pushad
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mov esi,0x280000
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mov edi,0x100000+512
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fcnew2:
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mov eax,dword [esi]
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mov ebx,dword [esi+4]
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shl ax,4
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shl eax,4
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shl bx,4
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shr ebx,4
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shrd eax,ebx,8
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shr ebx,8
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mov dword [edi],eax
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mov word [edi+4],bx
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add edi,6
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add esi,8
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cmp edi,0x100000+512+4278 ;4274 bytes - all used FAT
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jb fcnew2
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mov esi,0x100000+512 ; duplicate fat chain
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mov edi,0x100000+512+0x1200
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mov ecx,1069 ;4274/4
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cld
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rep movsd
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popad
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ret
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ramdisk_free_space:
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;---------------------------------------------
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;
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; returns free space in edi
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; rewr.by Mihasik
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;---------------------------------------------
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push eax ebx ecx
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mov edi,0x280000 ;start of FAT
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xor ax,ax ;Free cluster=0x0000 in FAT
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xor ebx,ebx ;counter
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mov ecx,2849 ;2849 clusters
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cld
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rdfs1:
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repne scasw
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jnz rdfs2 ;if last cluster not 0
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inc ebx
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test ecx, ecx
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jnz rdfs1
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rdfs2:
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shl ebx,9 ;free clusters*512
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mov edi,ebx
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pop ecx ebx eax
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ret
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expand_filename:
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;---------------------------------------------
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;
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; exapand filename with '.' to 11 character
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; eax - pointer to filename
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;---------------------------------------------
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push esi edi ebx
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mov edi,esp ; check for '.' in the name
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add edi,12+8
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mov esi,eax
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mov eax,edi
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mov [eax+0],dword ' '
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mov [eax+4],dword ' '
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mov [eax+8],dword ' '
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flr1:
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cmp [esi],byte '.'
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jne flr2
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mov edi,eax
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add edi,7
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jmp flr3
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flr2:
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mov bl,[esi]
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mov [edi],bl
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flr3:
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inc esi
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inc edi
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mov ebx,eax
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add ebx,11
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cmp edi,ebx
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jbe flr1
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pop ebx edi esi
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ret
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fileread:
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;----------------------------------------------------------------
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;
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; fileread - sys floppy
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;
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; eax points to filename 11 chars
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; ebx first wanted block ; 1+ ; if 0 then set to 1
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; ecx number of blocks to read ; 1+ ; if 0 then set to 1
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; edx mem location to return data
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; esi length of filename 12*X 0=root
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;
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; ret ebx = size or 0xffffffff file not found
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; eax = 0 ok read or other = errormsg
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;
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;--------------------------------------------------------------
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test ebx,ebx ;if ebx=0 - set to 1
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jnz frfl5
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inc ebx
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frfl5:
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test ecx,ecx ;if ecx=0 - set to 1
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jnz frfl6
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inc ecx
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frfl6:
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test esi,esi ; return ramdisk root
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jnz fr_noroot ;if not root
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cmp ebx,14 ;14 clusters=root dir
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ja oorr
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cmp ecx,14
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ja oorr
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jmp fr_do
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oorr:
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mov eax,5 ;out of root range (fnf)
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xor ebx,ebx
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dec ebx ;0xffffffff
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ret
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fr_do: ;reading rootdir
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mov edi,edx
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dec ebx
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push edx
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mov edx,ecx
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add edx,ebx
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cmp edx,15 ;ebx+ecx=14+1
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pushf
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jbe fr_do1
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sub edx,14
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sub ecx,edx
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fr_do1:
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shl ebx,9
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mov esi,0x100000+512*19
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add esi,ebx
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shl ecx,7
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cld
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rep movsd
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popf
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pop edx
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jae fr_do2
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xor eax,eax ; ok read
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xor ebx,ebx
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ret
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fr_do2: ;if last cluster
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mov eax,6 ;end of file
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xor ebx,ebx
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ret
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fr_noroot:
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sub esp,32
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call expand_filename
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dec ebx
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push eax
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push eax ebx ecx edx esi edi
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call rd_findfile
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je fifound
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add esp,32+28 ;if file not found
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ret
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fifound:
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mov ebx,[edi-11+28] ;file size
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mov [esp+20],ebx
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mov [esp+24],ebx
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add edi,0xf
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movzx eax,word [edi]
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mov edi,eax ;edi=cluster
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frnew:
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add eax,31 ;bootsector+2*fat+filenames
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shl eax,9 ;*512
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add eax,0x100000 ;image base
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mov ebx,[esp+8]
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mov ecx,512 ;[esp+4]
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cmp [esp+16],dword 0 ; wanted cluster ?
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jne frfl7
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call memmove
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add [esp+8],dword 512
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dec dword [esp+12] ; last wanted cluster ?
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je frnoread
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jmp frfl8
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frfl7:
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dec dword [esp+16]
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frfl8:
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movzx eax,word [edi*2+0x280000] ; find next cluster from FAT
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mov edi,eax
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cmp edi,4095 ;eof - cluster
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jz frnoread2
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cmp [esp+24],dword 512 ;eof - size
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jb frnoread
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sub [esp+24],dword 512
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jmp frnew
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frnoread2:
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cmp [esp+16],dword 0 ; eof without read ?
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je frnoread
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pop edi esi edx ecx
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add esp,4
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pop ebx ; ebx <- eax : size of file
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add esp,36
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mov eax,6 ; end of file
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ret
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frnoread:
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pop edi esi edx ecx
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add esp,4
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pop ebx ; ebx <- eax : size of file
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add esp,36
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xor eax,eax ;read ok
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ret
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filedelete:
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;--------------------------------------------
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;
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; filedelete - sys floppy
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; in:
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; eax - pointer to filename 11 chars
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;
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; out:
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; eax - 0 = successful, 5 = file not found
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;
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;--------------------------------------------
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sub esp,32
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call expand_filename
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push eax ebx ecx edx esi edi
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call rd_findfile
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je fifoundd
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pop edi esi edx ecx ebx eax ;file not found
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add esp,32
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mov eax,5
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ret
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fifoundd:
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mov [edi-11],byte 0xE5 ;mark filename deleted
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add edi,0xf
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movzx eax,word [edi]
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mov edi,eax ;edi = cluster
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frnewd:
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shl edi,1 ;find next cluster from FAT
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add edi,0x280000
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movzx eax,word [edi]
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mov [edi],word 0x0 ;clear fat chain cluster
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mov edi,eax
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cmp edi,dword 0xff8 ;last cluster ?
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jb frnewd
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pop edi esi edx ecx ebx eax
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add esp,32
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xor eax,eax ; file found
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ret
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filesave:
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;----------------------------------------------------------
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;
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; filesave - sys floppy
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;
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; eax points to filename 11 chars
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;
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; eax ; pointer to file name
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; ebx ; buffer
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; ecx ; count to write in bytes
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; edx ; 0 create new , 1 append
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;
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;-----------------------------------------------------------
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sub esp,32
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call expand_filename
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test edx,edx
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jnz fsdel
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pusha
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call filedelete
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popa
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fsdel:
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call ramdisk_free_space
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cmp ecx,edi
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jbe rd_do_save
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add esp,32
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mov eax,8 ;disk full
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ret
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rd_do_save:
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push eax ebx ecx edx esi edi
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mov edi,0x100000+512*18+512 ;Point at directory
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mov edx,224 +1
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; find an empty spot for filename in the root dir
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l20ds:
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dec edx
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jz frnoreadds
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l21ds:
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cmp [edi],byte 0xE5
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jz fifoundds
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cmp [edi],byte 0x0
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jz fifoundds
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add edi,32 ; Advance to next entry
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jmp l20ds
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fifoundds:
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push edi ; move the filename to root dir
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mov esi,[esp+4+20]
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mov ecx,11
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cld
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rep movsb
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pop edi
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mov edx,edi
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add edx,11+0xf ; edx <- cluster save position
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mov ebx,[esp+12] ; save file size
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mov [edi+28],ebx
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mov [edi+11],byte 0x20 ; attribute
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; Ivan Poddubny 11/12/2003:
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call get_date_for_file ; from FAT32.INC
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mov [edi+24],ax ; date
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call get_time_for_file ; from FAT32.INC
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mov [edi+22],ax ; time
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; End
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mov edi,0x280000 ;pointer to first cluster
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mov ecx,2849
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cld
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frnewds:
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xor ax,ax
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repne scasw
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mov ebx,2848
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sub ebx,ecx
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mov [edx],bx ; save next cluster pos. to prev cl.
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mov edx,edi ; next save pos abs mem add
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dec edx
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dec edx
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call fdc_filesave
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pusha ; move save to floppy cluster
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add ebx,31
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shl ebx,9
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add ebx,0x100000
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mov eax,[esp+32+16]
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mov ecx,512
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call memmove
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popa
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mov eax,[esp+12]
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cmp eax,512
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jbe flnsa
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sub eax,512
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mov [esp+12],eax
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add dword [esp+16], 512
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jmp frnewds
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flnsa:
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mov [edi-2],word 4095 ; mark end of file - last cluster
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frnoreadds:
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pop edi esi edx ecx ebx eax
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add esp,32
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; pusha
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; cli
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; call fdc_commitfile
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; sti
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; popa
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xor eax,eax ;ok write
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ret
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rd_findfile:
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;by Mihasik
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;IN: eax - pointer to filename OUT: filestring+11 in edi or notZero in flags and fnf in eax,ebx
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mov edi,0x100000+512*18+512 ;Point at directory
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cld
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rd_newsearch:
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mov esi,eax
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mov ecx,11
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rep cmpsb
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je rd_ff
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add cl,21
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add edi,ecx
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cmp edi,0x100000+512*33
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jb rd_newsearch
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mov eax,5 ;if file not found - eax=5
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xor ebx,ebx
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dec ebx ;ebx=0xffffffff and zf=0
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rd_ff:
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ret
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rd_getfileinfo:
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;get date, time, size or attributes of file
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;IN: eax - pointer to file, ebx - type of function: 12-get filesize, 13-get fileattr, 14-get filedate
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;ecx - filelengh 0=root
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;OUT: eax=0 - Ok or 5 - file not found ebx - date/time, size or attributes
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test ecx,ecx
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jnz no_getfinfo_root
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mov eax,5 ;if root - fnf
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xor ebx,ebx
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dec ebx
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ret
|
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no_getfinfo_root: ;if not root
|
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sub esp,32
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call expand_filename
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call rd_findfile
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je fifoundi
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add esp,32 ;if file not found
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ret
|
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fifoundi:
|
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cmp ebx,13
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jne no_rd_attr
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movzx ebx,byte [edi] ;get attributes
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jmp rd_getfileinfo_end
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no_rd_attr:
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cmp ebx,14
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jne no_rd_date
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mov ebx,dword [edi+11] ;get date/time
|
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jmp rd_getfileinfo_end
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no_rd_date:
|
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mov ebx,dword [edi+17] ;get size
|
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rd_getfileinfo_end:
|
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xor eax,eax
|
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add esp,32
|
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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
|
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jb .ascii
|
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cmp ax, 0x401
|
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jz .yo1
|
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cmp ax, 0x451
|
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jz .yo2
|
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cmp ax, 0x410
|
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jb .unk
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cmp ax, 0x440
|
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jb .rus1
|
||
cmp ax, 0x450
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jb .rus2
|
||
.unk:
|
||
mov al, '_'
|
||
jmp .doit
|
||
.yo1:
|
||
mov al, '<27>'
|
||
jmp .doit
|
||
.yo2:
|
||
mov al, '<27>'
|
||
jmp .doit
|
||
.rus1:
|
||
; 0x410-0x43F -> 0x80-0xAF
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||
add al, 0x70
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||
jmp .doit
|
||
.rus2:
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||
; 0x440-0x44F -> 0xE0-0xEF
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||
add al, 0xA0
|
||
.ascii:
|
||
.doit:
|
||
stosb
|
||
jmp uni2ansi_str
|
||
.done:
|
||
mov byte [edi], 0
|
||
ret
|
||
|
||
ansi2uni_char:
|
||
; convert ANSI character in al to UNICODE character in ax, using cp866 encoding
|
||
mov ah, 0
|
||
; 0x00-0x7F - trivial map
|
||
cmp al, 0x80
|
||
jb .ret
|
||
; 0x80-0xAF -> 0x410-0x43F
|
||
cmp al, 0xB0
|
||
jae @f
|
||
add ax, 0x410-0x80
|
||
.ret:
|
||
ret
|
||
@@:
|
||
; 0xE0-0xEF -> 0x440-0x44F
|
||
cmp al, 0xE0
|
||
jb .unk
|
||
cmp al, 0xF0
|
||
jae @f
|
||
add ax, 0x440-0xE0
|
||
ret
|
||
; 0xF0 -> 0x401
|
||
; 0xF1 -> 0x451
|
||
@@:
|
||
cmp al, '<27>'
|
||
jz .yo1
|
||
cmp al, '<27>'
|
||
jz .yo2
|
||
.unk:
|
||
mov al, '_' ; ah=0
|
||
ret
|
||
.yo1:
|
||
mov ax, 0x401
|
||
ret
|
||
.yo2:
|
||
mov ax, 0x451
|
||
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, '<27>'
|
||
jb .ret
|
||
cmp al, '<27>'
|
||
jb .rus1
|
||
cmp al, '<27>'
|
||
ja .ret
|
||
; 0xE0-0xEF -> 0x90-0x9F
|
||
sub al, '<27>'-'<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
|
||
test byte [ebp-4], 1
|
||
jnz .unicode_short
|
||
@@:
|
||
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
|
||
.unicode_short:
|
||
@@:
|
||
mov al, [edi]
|
||
inc edi
|
||
call ansi2uni_char
|
||
mov [ebp], ax
|
||
inc ebp
|
||
inc ebp
|
||
loop @b
|
||
pop ecx
|
||
@@:
|
||
cmp word [ebp-2], ' '
|
||
jnz @f
|
||
dec ebp
|
||
dec ebp
|
||
loop @b
|
||
@@:
|
||
mov word [ebp], '.'
|
||
inc ebp
|
||
inc ebp
|
||
mov ecx, 3
|
||
push ecx
|
||
@@:
|
||
mov al, [edi]
|
||
inc edi
|
||
call ansi2uni_char
|
||
mov [ebp], ax
|
||
inc ebp
|
||
inc ebp
|
||
loop @b
|
||
pop ecx
|
||
@@:
|
||
cmp word [ebp-2], ' '
|
||
jnz @f
|
||
dec ebp
|
||
dec ebp
|
||
loop @b
|
||
dec ebp
|
||
dec ebp
|
||
@@:
|
||
and word [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:
|
||
test byte [ebp-4], 1
|
||
jnz .ret
|
||
; 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
|
||
.ret:
|
||
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
|
||
|
||
fat_time_to_bdfe:
|
||
; in: eax=FAT time
|
||
; out: eax=BDFE time
|
||
push ecx edx
|
||
mov ecx, eax
|
||
mov edx, eax
|
||
shr eax, 11
|
||
shl eax, 16 ; hours
|
||
and edx, 0x1F
|
||
add edx, edx
|
||
mov al, dl ; seconds
|
||
shr ecx, 5
|
||
and ecx, 0x3F
|
||
mov ah, cl ; minutes
|
||
pop edx ecx
|
||
ret
|
||
|
||
fat_date_to_bdfe:
|
||
push ecx edx
|
||
mov ecx, eax
|
||
mov edx, eax
|
||
shr eax, 9
|
||
add ax, 1980
|
||
shl eax, 16 ; year
|
||
and edx, 0x1F
|
||
mov al, dl ; day
|
||
shr ecx, 5
|
||
and ecx, 0xF
|
||
mov ah, cl ; month
|
||
pop edx ecx
|
||
ret
|
||
|
||
fat_entry_to_bdfe:
|
||
; convert FAT entry at edi to BDFE (block of data of folder entry) at esi, advance esi
|
||
; destroys eax
|
||
movzx eax, byte [edi+11]
|
||
mov [esi], eax ; attributes
|
||
mov eax, [ebp-4]
|
||
mov [esi+4], eax ; ASCII/UNICODE name
|
||
movzx eax, word [edi+14]
|
||
call fat_time_to_bdfe
|
||
mov [esi+8], eax ; creation time
|
||
movzx eax, word [edi+16]
|
||
call fat_date_to_bdfe
|
||
mov [esi+12], eax ; creation date
|
||
and dword [esi+16], 0 ; last access time is not supported on FAT
|
||
movzx eax, word [edi+18]
|
||
call fat_date_to_bdfe
|
||
mov [esi+20], eax ; last access date
|
||
movzx eax, word [edi+22]
|
||
call fat_time_to_bdfe
|
||
mov [esi+24], eax ; last write time
|
||
movzx eax, word [edi+24]
|
||
call fat_date_to_bdfe
|
||
mov [esi+28], eax ; last write date
|
||
mov eax, [edi+28]
|
||
mov [esi+32], eax ; file size (low dword)
|
||
xor eax, eax
|
||
mov [esi+36], eax ; file size (high dword)
|
||
push ecx edi
|
||
lea edi, [esi+40]
|
||
mov esi, ebp
|
||
test byte [esi-4], 1
|
||
jz .ansi
|
||
mov ecx, 260/2
|
||
rep movsd
|
||
mov [edi-2], ax
|
||
@@:
|
||
mov esi, edi
|
||
pop edi ecx
|
||
ret
|
||
.ansi:
|
||
mov ecx, 264/4
|
||
rep movsd
|
||
mov [edi-1], al
|
||
jmp @b
|
||
|
||
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
|
||
push 0 ; for fat_get_name: read ASCII name
|
||
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+4
|
||
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+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 = bytes read 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
|
||
xor ebx, ebx
|
||
.reteof:
|
||
mov eax, 6 ; EOF
|
||
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 ; EOF
|
||
@@:
|
||
movzx edi, word [edi+26] ; cluster
|
||
.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
|
||
@@:
|
||
mov ebx, edx
|
||
call memmove
|
||
add edx, ecx
|
||
sub [esp], ecx
|
||
pop ecx
|
||
xor ebx, ebx
|
||
.skip:
|
||
movzx edi, word [edi*2+0x280000] ; find next cluster from FAT
|
||
jmp .new
|
||
.eof:
|
||
mov ebx, edx
|
||
pop eax edx ecx
|
||
sub ebx, edx
|
||
jmp .reteof
|
||
.done:
|
||
mov ebx, edx
|
||
pop eax edx ecx edi
|
||
sub ebx, edx
|
||
ret
|
||
|
||
;----------------------------------------------------------------
|
||
;
|
||
; fs_RamdiskReadFolder - LFN variant for reading sys floppy folder
|
||
;
|
||
; esi points to filename; only root is folder on ramdisk
|
||
; ebx pointer to structure 32-bit number = first wanted block
|
||
; & 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 = size or 0xffffffff file not found
|
||
; eax = 0 ok read or other = errormsg
|
||
;
|
||
;--------------------------------------------------------------
|
||
fs_RamdiskReadFolder:
|
||
cmp byte [esi], 0
|
||
jz @f
|
||
; ramdisk doesn't support folders
|
||
mov eax, ERROR_ACCESS_DENIED
|
||
or ebx, -1
|
||
ret
|
||
@@:
|
||
push esi edi ecx
|
||
; init header
|
||
push ecx
|
||
mov edi, edx
|
||
mov ecx, 32/4
|
||
xor eax, eax
|
||
rep stosd
|
||
mov byte [edx], 1 ; version
|
||
pop ecx
|
||
push ebp
|
||
sub esp, 262*2 ; allocate space for LFN
|
||
mov ebp, esp
|
||
push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE name
|
||
mov ebx, [ebx]
|
||
; read root
|
||
mov esi, edi ; esi points to block of data of folder entry (BDFE)
|
||
mov edi, 0x100000+512*19
|
||
.l1:
|
||
call fat_get_name
|
||
jc .l2
|
||
cmp byte [edi+11], 0xF
|
||
jnz @f
|
||
add edi, 0x20
|
||
@@:
|
||
inc dword [edx+8] ; new file found
|
||
dec ebx
|
||
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, 0x100000+512*33
|
||
jb .l1
|
||
add esp, 262*2+4
|
||
pop ebp
|
||
mov ebx, [edx+4]
|
||
xor eax, eax
|
||
dec ecx
|
||
js @f
|
||
mov al, ERROR_END_OF_FILE
|
||
@@:
|
||
pop ecx edi esi
|
||
ret
|
||
|
||
iglobal
|
||
label fat_legal_chars byte
|
||
; 0 = not allowed
|
||
; 1 = allowed only in long names
|
||
; 3 = allowed
|
||
times 32 db 0
|
||
; ! " # $ % & ' ( ) * + , - . /
|
||
db 1,3,0,3,3,3,3,3,3,3,0,1,1,3,3,0
|
||
; 0 1 2 3 4 5 6 7 8 9 : ; < = > ?
|
||
db 3,3,3,3,3,3,3,3,3,3,0,1,0,1,0,0
|
||
; @ A B C D E F G H I J K L M N O
|
||
db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
|
||
; P Q R S T U V W X Y Z [ \ ] ^ _
|
||
db 3,3,3,3,3,3,3,3,3,3,3,1,0,1,3,3
|
||
; ` a b c d e f g h i j k l m n o
|
||
db 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3
|
||
; p q r s t u v w x y z { | } ~
|
||
db 3,3,3,3,3,3,3,3,3,3,3,3,0,3,3,0
|
||
endg
|
||
|
||
fat_name_is_legal:
|
||
; in: esi->(long) name
|
||
; out: CF set <=> legal
|
||
; destroys eax
|
||
push esi
|
||
xor eax, eax
|
||
@@:
|
||
lodsb
|
||
test al, al
|
||
jz .done
|
||
cmp al, 80h
|
||
jae .big
|
||
test [fat_legal_chars+eax], 1
|
||
jnz @b
|
||
.err:
|
||
pop esi
|
||
clc
|
||
ret
|
||
.big:
|
||
; 0x80-0xAF, 0xE0-0xEF
|
||
cmp al, 0xB0
|
||
jb @b
|
||
cmp al, 0xE0
|
||
jb .err
|
||
cmp al, 0xF0
|
||
jb @b
|
||
jmp .err
|
||
.done:
|
||
sub esi, [esp]
|
||
cmp esi, 257
|
||
pop esi
|
||
ret
|
||
|
||
fat_next_short_name:
|
||
; in: edi->8+3 name
|
||
; out: name corrected
|
||
; CF=1 <=> error
|
||
pushad
|
||
mov ecx, 8
|
||
mov al, '~'
|
||
std
|
||
push edi
|
||
add edi, 7
|
||
repnz scasb
|
||
pop edi
|
||
cld
|
||
jz .tilde
|
||
; tilde is not found, insert "~1" at end
|
||
add edi, 6
|
||
cmp word [edi], ' '
|
||
jnz .insert_tilde
|
||
@@: dec edi
|
||
cmp byte [edi], ' '
|
||
jz @b
|
||
inc edi
|
||
.insert_tilde:
|
||
mov word [edi], '~1'
|
||
popad
|
||
; clc ; CF already cleared
|
||
ret
|
||
.tilde:
|
||
push edi
|
||
add edi, 7
|
||
xor ecx, ecx
|
||
@@:
|
||
; after tilde may be only digits and trailing spaces
|
||
cmp byte [edi], '~'
|
||
jz .break
|
||
cmp byte [edi], ' '
|
||
jz .space
|
||
cmp byte [edi], '9'
|
||
jnz .found
|
||
dec edi
|
||
jmp @b
|
||
.space:
|
||
dec edi
|
||
inc ecx
|
||
jmp @b
|
||
.found:
|
||
inc byte [edi]
|
||
.succ:
|
||
pop edi
|
||
popad
|
||
clc
|
||
ret
|
||
.break:
|
||
jecxz .noplace
|
||
inc edi
|
||
mov al, '1'
|
||
@@:
|
||
xchg al, [edi]
|
||
inc edi
|
||
cmp al, ' '
|
||
mov al, '0'
|
||
jnz @b
|
||
jmp .succ
|
||
.noplace:
|
||
dec edi
|
||
cmp edi, [esp]
|
||
jz .err
|
||
add dword [esp], 8
|
||
mov word [edi], '~1'
|
||
inc edi
|
||
inc edi
|
||
@@:
|
||
mov byte [edi], '0'
|
||
inc edi
|
||
cmp edi, [esp]
|
||
jb @b
|
||
pop edi
|
||
popad
|
||
;clc ; automatically
|
||
ret
|
||
.err:
|
||
pop edi
|
||
popad
|
||
stc
|
||
ret
|
||
|
||
fat_gen_short_name:
|
||
; in: esi->long name
|
||
; edi->buffer (8+3=11 chars)
|
||
; out: buffer filled
|
||
pushad
|
||
mov eax, ' '
|
||
push edi
|
||
stosd
|
||
stosd
|
||
stosd
|
||
pop edi
|
||
xor eax, eax
|
||
push 8
|
||
pop ebx
|
||
lea ecx, [edi+8]
|
||
.loop:
|
||
lodsb
|
||
test al, al
|
||
jz .done
|
||
call char_toupper
|
||
cmp al, ' '
|
||
jz .space
|
||
cmp al, 80h
|
||
ja .big
|
||
test [fat_legal_chars+eax], 2
|
||
jnz .symbol
|
||
.inv_symbol:
|
||
mov al, '_'
|
||
or bh, 1
|
||
.symbol:
|
||
cmp al, '.'
|
||
jz .dot
|
||
.normal_symbol:
|
||
dec bl
|
||
jns .store
|
||
mov bl, 0
|
||
.space:
|
||
or bh, 1
|
||
jmp .loop
|
||
.store:
|
||
stosb
|
||
jmp .loop
|
||
.big:
|
||
cmp al, 0xB0
|
||
jb .normal_symbol
|
||
cmp al, 0xE0
|
||
jb .inv_symbol
|
||
cmp al, 0xF0
|
||
jb .normal_symbol
|
||
jmp .inv_symbol
|
||
.dot:
|
||
test bh, 2
|
||
jz .firstdot
|
||
pop ebx
|
||
add ebx, edi
|
||
sub ebx, ecx
|
||
push ebx
|
||
cmp edi, ecx
|
||
jbe .skip
|
||
@@:
|
||
dec edi
|
||
mov al, ' '
|
||
xchg al, [edi]
|
||
dec ebx
|
||
mov [ebx], al
|
||
cmp edi, ecx
|
||
ja @b
|
||
.skip:
|
||
mov bh, 3
|
||
jmp @f
|
||
.firstdot:
|
||
cmp bl, 8
|
||
jz .space
|
||
push edi
|
||
or bh, 2
|
||
@@:
|
||
mov edi, ecx
|
||
mov bl, 3
|
||
jmp .loop
|
||
.done:
|
||
test bh, 2
|
||
jz @f
|
||
pop edi
|
||
@@:
|
||
lea edi, [ecx-8]
|
||
test bh, 1
|
||
jz @f
|
||
call fat_next_short_name
|
||
@@:
|
||
popad
|
||
ret
|
||
|
||
;----------------------------------------------------------------
|
||
;
|
||
; fs_RamdiskRewrite - LFN variant for writing sys floppy
|
||
;
|
||
; 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
|
||
;
|
||
;--------------------------------------------------------------
|
||
@@:
|
||
mov eax, ERROR_ACCESS_DENIED
|
||
xor ebx, ebx
|
||
ret
|
||
|
||
fs_RamdiskRewrite:
|
||
cmp byte [esi], 0
|
||
jz @b
|
||
; ramdisk doesn't support folders
|
||
push esi
|
||
@@:
|
||
lodsb
|
||
test al, al
|
||
jz @f
|
||
cmp al, '/'
|
||
jnz @b
|
||
pop esi
|
||
.err5:
|
||
mov eax, 5 ; file not found
|
||
xor ebx, ebx
|
||
ret
|
||
@@:
|
||
pop esi
|
||
; check existence
|
||
push edi
|
||
call rd_find_lfn
|
||
jc .notfound
|
||
; found, delete FAT chain
|
||
push edi
|
||
xor eax, eax
|
||
mov dword [edi+28], eax ; zero size
|
||
xchg ax, word [edi+26] ; start cluster
|
||
test eax, eax
|
||
jz .done1
|
||
@@:
|
||
cmp eax, 0xFF8
|
||
jae .done1
|
||
lea edi, [0x280000 + eax*2] ; position in FAT
|
||
xor eax, eax
|
||
xchg ax, [edi]
|
||
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
|
||
pop edi
|
||
jmp .err5
|
||
@@:
|
||
sub esp, 12
|
||
mov edi, esp
|
||
call fat_gen_short_name
|
||
.test_short_name_loop:
|
||
push esi ecx
|
||
mov esi, 0x100000+512*19
|
||
.test_short_name_entry:
|
||
cmp byte [esi+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:
|
||
add esi, 20h
|
||
cmp esi, 0x100000+512*33
|
||
jb .test_short_name_entry
|
||
pop ecx esi
|
||
jmp .found
|
||
.short_name_found:
|
||
call fat_next_short_name
|
||
pop ecx esi
|
||
jnc .test_short_name_loop
|
||
.disk_full:
|
||
add esp, 12
|
||
pop edi
|
||
mov eax, ERROR_DISK_FULL
|
||
xor ebx, ebx
|
||
ret
|
||
.found:
|
||
; 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:
|
||
; find <eax> successive entries in directory
|
||
xor ecx, ecx
|
||
mov edi, 0x100000+512*19
|
||
.scan_dir:
|
||
cmp byte [edi], 0
|
||
jz .free
|
||
cmp byte [edi], 0xE5
|
||
jz .free
|
||
xor ecx, ecx
|
||
.scan_cont:
|
||
add edi, 0x20
|
||
cmp edi, 0x100000+512*33
|
||
jb .scan_dir
|
||
pop edi ecx
|
||
jmp .disk_full
|
||
.free:
|
||
inc ecx
|
||
cmp ecx, eax
|
||
jb .scan_cont
|
||
; found!
|
||
; calculate name checksum
|
||
push esi ecx
|
||
mov esi, [esp+8]
|
||
mov ecx, 11
|
||
xor eax, eax
|
||
@@:
|
||
ror al, 1
|
||
add al, [esi]
|
||
inc esi
|
||
loop @b
|
||
pop ecx esi
|
||
; edi points to last entry in free chunk
|
||
dec ecx
|
||
jz .nolfn
|
||
push esi
|
||
push edi
|
||
.writelfn:
|
||
sub edi, 20h
|
||
push ecx eax
|
||
mov eax, [esp+8]
|
||
sub eax, edi
|
||
shr eax, 5
|
||
cmp ecx, 1
|
||
jnz @f
|
||
or al, 40h
|
||
@@:
|
||
stosb
|
||
mov cl, 5
|
||
call .read_symbols
|
||
mov ax, 0xF
|
||
stosw
|
||
pop eax
|
||
stosb
|
||
push eax
|
||
mov cl, 6
|
||
call .read_symbols
|
||
xor eax, eax
|
||
stosw
|
||
mov cl, 2
|
||
call .read_symbols
|
||
pop eax ecx
|
||
sub edi, 0x20
|
||
loop .writelfn
|
||
pop edi
|
||
pop esi
|
||
.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
|
||
and word [edi+20], 0 ; high word of cluster
|
||
and word [edi+26], 0 ; low word of cluster - to be filled
|
||
and dword [edi+28], 0 ; file size - to be filled
|
||
.doit:
|
||
push ecx edx
|
||
push ecx
|
||
push edi
|
||
add edi, 26 ; edi points to low word of cluster
|
||
push edi
|
||
jecxz .done
|
||
mov ecx, 2849
|
||
mov edi, 0x280000
|
||
.write_loop:
|
||
; allocate new cluster
|
||
xor eax, eax
|
||
repnz scasw
|
||
jnz .disk_full2
|
||
dec edi
|
||
dec edi
|
||
lea eax, [edi-0x280000]
|
||
shr eax, 1 ; eax = cluster
|
||
mov word [edi], 0xFFF ; mark as last cluster
|
||
xchg edi, [esp]
|
||
stosw
|
||
pop edi
|
||
push edi
|
||
inc ecx
|
||
; write data
|
||
shl eax, 9
|
||
add eax, 0x100000+31*512
|
||
mov ebx, edx
|
||
xchg eax, ebx
|
||
push ecx
|
||
mov ecx, 512
|
||
cmp dword [esp+12], ecx
|
||
jae @f
|
||
mov ecx, [esp+12]
|
||
@@:
|
||
call memmove
|
||
add edx, ecx
|
||
sub [esp+12], ecx
|
||
pop ecx
|
||
jnz .write_loop
|
||
.done:
|
||
mov ebx, edx
|
||
pop edi edi ecx edx ecx
|
||
sub ebx, edx
|
||
mov [edi+28], ebx
|
||
pop edi
|
||
xor eax, eax
|
||
ret
|
||
.disk_full2:
|
||
mov ebx, edx
|
||
pop edi edi ecx edx ecx
|
||
sub ebx, edx
|
||
mov [edi+28], ebx
|
||
pop edi
|
||
push ERROR_DISK_FULL
|
||
pop eax
|
||
ret
|
||
|
||
.read_symbol:
|
||
or ax, -1
|
||
test esi, esi
|
||
jz .retFFFF
|
||
lodsb
|
||
test al, al
|
||
jnz ansi2uni_char
|
||
xor eax, eax
|
||
xor esi, esi
|
||
.retFFFF:
|
||
ret
|
||
|
||
.read_symbols:
|
||
call .read_symbol
|
||
stosw
|
||
loop .read_symbols
|
||
ret
|
||
|
||
; \end{diamond}
|