mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-04 14:21:55 +03:00
1078 lines
24 KiB
PHP
1078 lines
24 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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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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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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add edi,4
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mov dword [edi],ebx
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add edi,4
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mov dword [edi],ecx
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add edi,4
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mov dword [edi],edx
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add edi,4
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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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add edi,4
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mov word [edi],bx
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add edi,2
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add esi,8
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||
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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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jcxz rdfs2 ;if last cluster=0
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jmp rdfs1 ;if not last
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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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||
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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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test edx,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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mov eax,[esp+16]
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add eax,512
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mov [esp+16],eax
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jmp frnewds
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flnsa:
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dec edi
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dec edi
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mov [edi],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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||
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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
|
||
;ecx - filelengh 0=root
|
||
;OUT: eax=0 - Ok or 5 - file not found ebx - date/time, size or attributes
|
||
test ecx,ecx
|
||
jnz no_getfinfo_root
|
||
mov eax,5 ;if root - fnf
|
||
xor ebx,ebx
|
||
dec ebx
|
||
ret
|
||
no_getfinfo_root: ;if not root
|
||
sub esp,32
|
||
call expand_filename
|
||
call rd_findfile
|
||
je fifoundi
|
||
add esp,32 ;if file not found
|
||
ret
|
||
fifoundi:
|
||
cmp ebx,13
|
||
jne no_rd_attr
|
||
movzx ebx,byte [edi] ;get attributes
|
||
jmp rd_getfileinfo_end
|
||
no_rd_attr:
|
||
cmp ebx,14
|
||
jne no_rd_date
|
||
mov ebx,dword [edi+11] ;get date/time
|
||
jmp rd_getfileinfo_end
|
||
no_rd_date:
|
||
mov ebx,dword [edi+17] ;get size
|
||
rd_getfileinfo_end:
|
||
xor eax,eax
|
||
add esp,32
|
||
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, '<27>'
|
||
jmp .doit
|
||
.yo2:
|
||
mov al, '<27>'
|
||
jmp .doit
|
||
.rus1:
|
||
; 0x410-0x43F -> 0x80-0xAF
|
||
add al, 0x70
|
||
jmp .doit
|
||
.rus2:
|
||
; 0x440-0x44F -> 0xE0-0xEF
|
||
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
|
||
cmp byte [ebp-4], 0
|
||
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:
|
||
cmp byte [ebp-4], 0
|
||
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
|
||
mov ecx, 259/2
|
||
rep movsd
|
||
movsw
|
||
stosw
|
||
mov esi, edi
|
||
pop edi ecx
|
||
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
|
||
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 32-bit number = first wanted block
|
||
; 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:
|
||
mov ebx, [ebx]
|
||
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 1 ; for fat_get_name: read UNICODE name
|
||
; 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
|
||
|
||
; \end{diamond} |