mirror of
https://github.com/KolibriOS/kolibrios.git
synced 2024-12-17 20:32:35 +03:00
523 lines
13 KiB
PHP
523 lines
13 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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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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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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cmp [esp+12],dword 0
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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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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,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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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
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