forked from KolibriOS/kolibrios
2297 lines
58 KiB
PHP
2297 lines
58 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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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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$Revision$
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; calculate fat chain
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calculatefatchain:
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pushad
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mov esi, RAMDISK+512
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mov edi, RAMDISK_FAT
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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, RAMDISK_FAT+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, RAMDISK_FAT
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mov edi, RAMDISK+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, RAMDISK+512+4278;4274 bytes - all used FAT
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jb fcnew2
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mov esi, RAMDISK+512 ; duplicate fat chain
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mov edi, RAMDISK+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, RAMDISK_FAT;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, RAMDISK+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, RAMDISK ;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+RAMDISK_FAT] ; 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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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, RAMDISK+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, RAMDISK+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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; \begin{diamond}
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uni2ansi_str:
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; convert UNICODE zero-terminated string to ASCII-string (codepage 866)
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; in: esi->source, edi->buffer (may be esi=edi)
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; destroys: eax,esi,edi
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lodsw
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test ax, ax
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jz .done
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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
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cmp ax, 0x450
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jb .rus2
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.unk:
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mov al, '_'
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jmp .doit
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.yo1:
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mov al, 0xF0 ; 'Ё'
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jmp .doit
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.yo2:
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mov al, 0xF1 ; 'ё'
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jmp .doit
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.rus1:
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; 0x410-0x43F -> 0x80-0xAF
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add al, 0x70
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jmp .doit
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.rus2:
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; 0x440-0x44F -> 0xE0-0xEF
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add al, 0xA0
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.ascii:
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.doit:
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stosb
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jmp uni2ansi_str
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.done:
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mov byte [edi], 0
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ret
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ansi2uni_char:
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; convert ANSI character in al to UNICODE character in ax, using cp866 encoding
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mov ah, 0
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; 0x00-0x7F - trivial map
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cmp al, 0x80
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jb .ret
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; 0x80-0xAF -> 0x410-0x43F
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cmp al, 0xB0
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jae @f
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add ax, 0x410-0x80
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.ret:
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ret
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@@:
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; 0xE0-0xEF -> 0x440-0x44F
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cmp al, 0xE0
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jb .unk
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cmp al, 0xF0
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jae @f
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add ax, 0x440-0xE0
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ret
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; 0xF0 -> 0x401
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; 0xF1 -> 0x451
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@@:
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cmp al, 0xF0 ; 'Ё'
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jz .yo1
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cmp al, 0xF1 ; 'ё'
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jz .yo2
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.unk:
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mov al, '_' ; ah=0
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ret
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.yo1:
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mov ax, 0x401
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ret
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.yo2:
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mov ax, 0x451
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ret
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char_toupper:
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; convert character to uppercase, using cp866 encoding
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; in: al=symbol
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; out: al=converted symbol
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cmp al, 'a'
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jb .ret
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cmp al, 'z'
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jbe .az
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cmp al, 0xF1 ; 'ё'
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jz .yo1
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cmp al, 0xA0 ; 'а'
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jb .ret
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cmp al, 0xE0 ; 'р'
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jb .rus1
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cmp al, 0xEF ; 'я'
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ja .ret
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; 0xE0-0xEF -> 0x90-0x9F
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sub al, 0xE0-0x90
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.ret:
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ret
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.rus1:
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; 0xA0-0xAF -> 0x80-0x8F
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.az:
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and al, not 0x20
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ret
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.yo1:
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; 0xF1 -> 0xF0
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dec ax
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ret
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fat_get_name:
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; in: edi->FAT entry
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; out: CF=1 - no valid entry
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; else CF=0 and ebp->ASCIIZ-name
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; (maximum length of filename is 255 (wide) symbols without trailing 0,
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; but implementation requires buffer 261 words)
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; destroys eax
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cmp byte [edi], 0
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jz .no
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cmp byte [edi], 0xE5
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jnz @f
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.no:
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stc
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ret
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@@:
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cmp byte [edi+11], 0xF
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jz .longname
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test byte [edi+11], 8
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jnz .no
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push ecx
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push edi ebp
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test byte [ebp-4], 1
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jnz .unicode_short
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mov eax, [edi]
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mov ecx, [edi+4]
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mov [ebp], eax
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mov [ebp+4], ecx
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mov ecx, 8
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@@:
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cmp byte [ebp+ecx-1], ' '
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loope @b
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mov eax, [edi+8]
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cmp al, ' '
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je .done
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shl eax, 8
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mov al, '.'
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lea ebp, [ebp+ecx+1]
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mov [ebp], eax
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mov ecx, 3
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@@:
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rol eax, 8
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cmp al, ' '
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jne .done
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loop @b
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dec ebp
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.done:
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and byte [ebp+ecx+1], 0 ; CF=0
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pop ebp edi ecx
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ret
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.unicode_short:
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mov ecx, 8
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push ecx
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@@:
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mov al, [edi]
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inc edi
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call ansi2uni_char
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mov [ebp], ax
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inc ebp
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inc ebp
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loop @b
|
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pop ecx
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@@:
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cmp word [ebp-2], ' '
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jnz @f
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dec ebp
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dec ebp
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loop @b
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@@:
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mov word [ebp], '.'
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inc ebp
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inc ebp
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mov ecx, 3
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push ecx
|
||
@@:
|
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mov al, [edi]
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inc edi
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call ansi2uni_char
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mov [ebp], ax
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inc ebp
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inc ebp
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||
loop @b
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pop ecx
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||
@@:
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||
cmp word [ebp-2], ' '
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jnz @f
|
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dec ebp
|
||
dec ebp
|
||
loop @b
|
||
dec ebp
|
||
dec ebp
|
||
@@:
|
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and word [ebp], 0 ; CF=0
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pop ebp edi ecx
|
||
ret
|
||
.longname:
|
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; 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
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||
jz @f
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mov word [ebp+13*2], 0
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||
@@:
|
||
push eax
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||
; now copy name from edi to ebp ...
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||
mov eax, [edi+1]
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||
mov [ebp], eax ; symbols 1,2
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||
mov eax, [edi+5]
|
||
mov [ebp+4], eax ; 3,4
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||
mov eax, [edi+9]
|
||
mov [ebp+8], ax ; 5
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||
mov eax, [edi+14]
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||
mov [ebp+10], eax ; 6,7
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mov eax, [edi+18]
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||
mov [ebp+14], eax ; 8,9
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||
mov eax, [edi+22]
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||
mov [ebp+18], eax ; 10,11
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||
mov eax, [edi+28]
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||
mov [ebp+22], eax ; 12,13
|
||
; ... done
|
||
pop eax
|
||
sub ebp, eax
|
||
test eax, eax
|
||
jz @f
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||
; 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
|
||
|
||
bdfe_to_fat_time:
|
||
push edx
|
||
mov edx, eax
|
||
shr eax, 16
|
||
and dh, 0x3F
|
||
shl eax, 6
|
||
or al, dh
|
||
shr dl, 1
|
||
and dl, 0x1F
|
||
shl eax, 5
|
||
or al, dl
|
||
pop edx
|
||
ret
|
||
|
||
bdfe_to_fat_date:
|
||
push edx
|
||
mov edx, eax
|
||
shr eax, 16
|
||
sub ax, 1980
|
||
and dh, 0xF
|
||
shl eax, 4
|
||
or al, dh
|
||
and dl, 0x1F
|
||
shl eax, 5
|
||
or al, dl
|
||
pop edx
|
||
ret
|
||
|
||
fat_entry_to_bdfe:
|
||
; convert FAT entry at edi to BDFE (block of data of folder entry) at esi, advance esi
|
||
; destroys eax
|
||
mov eax, [ebp-4]
|
||
mov [esi+4], eax ; ASCII/UNICODE name
|
||
fat_entry_to_bdfe2:
|
||
movzx eax, byte [edi+11]
|
||
mov [esi], eax ; attributes
|
||
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)
|
||
test ebp, ebp
|
||
jz .ret
|
||
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:
|
||
ret
|
||
.ansi:
|
||
mov ecx, 264/4
|
||
rep movsd
|
||
mov [edi-1], al
|
||
jmp @b
|
||
|
||
bdfe_to_fat_entry:
|
||
; convert BDFE at edx to FAT entry at edi
|
||
; destroys eax
|
||
; attributes byte
|
||
test byte [edi+11], 8 ; volume label?
|
||
jnz @f
|
||
mov al, [edx]
|
||
and al, 0x27
|
||
and byte [edi+11], 0x10
|
||
or byte [edi+11], al
|
||
@@:
|
||
mov eax, [edx+8]
|
||
call bdfe_to_fat_time
|
||
mov [edi+14], ax ; creation time
|
||
mov eax, [edx+12]
|
||
call bdfe_to_fat_date
|
||
mov [edi+16], ax ; creation date
|
||
mov eax, [edx+20]
|
||
call bdfe_to_fat_date
|
||
mov [edi+18], ax ; last access date
|
||
mov eax, [edx+24]
|
||
call bdfe_to_fat_time
|
||
mov [edi+22], ax ; last write time
|
||
mov eax, [edx+28]
|
||
call bdfe_to_fat_date
|
||
mov [edi+24], ax ; last write date
|
||
ret
|
||
|
||
ramdisk_root_first:
|
||
mov edi, RAMDISK+512*19
|
||
clc
|
||
ret
|
||
ramdisk_root_next:
|
||
add edi, 0x20
|
||
cmp edi, RAMDISK+512*33
|
||
cmc
|
||
ret
|
||
|
||
ramdisk_root_extend_dir:
|
||
stc
|
||
ret
|
||
|
||
uglobal
|
||
; this is for delete support
|
||
rd_prev_sector dd ?
|
||
rd_prev_prev_sector dd ?
|
||
endg
|
||
|
||
ramdisk_notroot_next:
|
||
add edi, 0x20
|
||
test edi, 0x1FF
|
||
jz ramdisk_notroot_next_sector
|
||
ret ; CF=0
|
||
ramdisk_notroot_next_sector:
|
||
push ecx
|
||
mov ecx, [eax]
|
||
push [rd_prev_sector]
|
||
pop [rd_prev_prev_sector]
|
||
mov [rd_prev_sector], ecx
|
||
mov ecx, [ecx*2+RAMDISK_FAT]
|
||
and ecx, 0xFFF
|
||
cmp ecx, 2849
|
||
jae ramdisk_notroot_first.err2
|
||
mov [eax], ecx
|
||
pop ecx
|
||
ramdisk_notroot_first:
|
||
mov eax, [eax]
|
||
cmp eax, 2
|
||
jb .err
|
||
cmp eax, 2849
|
||
jae .err
|
||
shl eax, 9
|
||
lea edi, [eax+(31 shl 9)+RAMDISK]
|
||
clc
|
||
ret
|
||
.err2:
|
||
pop ecx
|
||
.err:
|
||
stc
|
||
ret
|
||
ramdisk_notroot_next_write:
|
||
test edi, 0x1FF
|
||
jz ramdisk_notroot_next_sector
|
||
ramdisk_root_next_write:
|
||
ret
|
||
|
||
ramdisk_notroot_extend_dir:
|
||
pusha
|
||
xor eax, eax
|
||
mov edi, RAMDISK_FAT
|
||
mov ecx, 2849
|
||
repnz scasw
|
||
jnz .notfound
|
||
mov word [edi-2], 0xFFF
|
||
sub edi, RAMDISK_FAT
|
||
shr edi, 1
|
||
dec edi
|
||
mov eax, [esp+28]
|
||
mov ecx, [eax]
|
||
mov [RAMDISK_FAT+ecx*2], di
|
||
mov [eax], edi
|
||
shl edi, 9
|
||
add edi, (31 shl 9)+RAMDISK
|
||
mov [esp], edi
|
||
xor eax, eax
|
||
mov ecx, 128
|
||
rep stosd
|
||
popa
|
||
clc
|
||
ret
|
||
.notfound:
|
||
popa
|
||
stc
|
||
ret
|
||
|
||
rd_find_lfn:
|
||
; in: esi+ebp -> name
|
||
; out: CF=1 - file not found
|
||
; else CF=0 and edi->direntry
|
||
push esi edi
|
||
push 0
|
||
push ramdisk_root_first
|
||
push ramdisk_root_next
|
||
.loop:
|
||
call fat_find_lfn
|
||
jc .notfound
|
||
cmp byte [esi], 0
|
||
jz .found
|
||
.continue:
|
||
test byte [edi+11], 10h
|
||
jz .notfound
|
||
movzx eax, word [edi+26]
|
||
mov [esp+8], eax
|
||
mov dword [esp+4], ramdisk_notroot_first
|
||
mov dword [esp], ramdisk_notroot_next
|
||
test eax, eax
|
||
jnz .loop
|
||
mov dword [esp+4], ramdisk_root_first
|
||
mov dword [esp], ramdisk_notroot_next
|
||
jmp .loop
|
||
.notfound:
|
||
add esp, 12
|
||
pop edi esi
|
||
stc
|
||
ret
|
||
.found:
|
||
test ebp, ebp
|
||
jz @f
|
||
mov esi, ebp
|
||
xor ebp, ebp
|
||
jmp .continue
|
||
@@:
|
||
mov eax, [esp+8]
|
||
add esp, 16 ; CF=0
|
||
pop 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, RAMDISK ; 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+RAMDISK_FAT] ; 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:
|
||
push edi
|
||
cmp byte [esi], 0
|
||
jz .root
|
||
call rd_find_lfn
|
||
jnc .found
|
||
pop edi
|
||
or ebx, -1
|
||
mov eax, ERROR_FILE_NOT_FOUND
|
||
ret
|
||
.found:
|
||
test byte [edi+11], 0x10
|
||
jnz .found_dir
|
||
pop edi
|
||
or ebx, -1
|
||
mov eax, ERROR_ACCESS_DENIED
|
||
ret
|
||
.found_dir:
|
||
movzx eax, word [edi+26]
|
||
add eax, 31
|
||
push 0
|
||
jmp .doit
|
||
.root:
|
||
mov eax, 19
|
||
push 14
|
||
.doit:
|
||
push esi ecx ebp
|
||
sub esp, 262*2 ; reserve space for LFN
|
||
mov ebp, esp
|
||
push dword [ebx+4] ; for fat_get_name: read ANSI/UNICODE names
|
||
mov ebx, [ebx]
|
||
; init header
|
||
push eax ecx
|
||
mov edi, edx
|
||
mov ecx, 32/4
|
||
xor eax, eax
|
||
rep stosd
|
||
mov byte [edx], 1 ; version
|
||
pop ecx eax
|
||
mov esi, edi ; esi points to block of data of folder entry (BDFE)
|
||
.main_loop:
|
||
mov edi, eax
|
||
shl edi, 9
|
||
add edi, RAMDISK
|
||
push eax
|
||
.l1:
|
||
call fat_get_name
|
||
jc .l2
|
||
cmp byte [edi+11], 0xF
|
||
jnz .do_bdfe
|
||
add edi, 0x20
|
||
test edi, 0x1FF
|
||
jnz .do_bdfe
|
||
pop eax
|
||
inc eax
|
||
dec byte [esp+262*2+16]
|
||
jz .done
|
||
jns @f
|
||
; read next sector from FAT
|
||
mov eax, [(eax-31-1)*2+RAMDISK_FAT]
|
||
and eax, 0xFFF
|
||
cmp eax, 0xFF8
|
||
jae .done
|
||
add eax, 31
|
||
mov byte [esp+262*2+16], 0
|
||
@@:
|
||
mov edi, eax
|
||
shl edi, 9
|
||
add edi, RAMDISK
|
||
push eax
|
||
.do_bdfe:
|
||
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
|
||
test edi, 0x1FF
|
||
jnz .l1
|
||
pop eax
|
||
inc eax
|
||
dec byte [esp+262*2+16]
|
||
jz .done
|
||
jns @f
|
||
; read next sector from FAT
|
||
mov eax, [(eax-31-1)*2+RAMDISK_FAT]
|
||
and eax, 0xFFF
|
||
cmp eax, 0xFF8
|
||
jae .done
|
||
add eax, 31
|
||
mov byte [esp+262*2+16], 0
|
||
@@:
|
||
jmp .main_loop
|
||
.done:
|
||
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 esi edi edi
|
||
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
|
||
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]
|
||
add dword [esp], 8
|
||
jmp .zerorest
|
||
.break:
|
||
jecxz .noplace
|
||
inc edi
|
||
mov al, '1'
|
||
@@:
|
||
xchg al, [edi]
|
||
inc edi
|
||
cmp al, ' '
|
||
mov al, '0'
|
||
jnz @b
|
||
.succ:
|
||
pop edi
|
||
popad
|
||
clc
|
||
ret
|
||
.noplace:
|
||
dec edi
|
||
cmp edi, [esp]
|
||
jz .err
|
||
add dword [esp], 8
|
||
mov word [edi], '~1'
|
||
inc edi
|
||
inc edi
|
||
@@:
|
||
mov byte [edi], '0'
|
||
.zerorest:
|
||
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
|
||
movi ebx, 8
|
||
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 ebx, ecx
|
||
jb @f
|
||
pop ebx
|
||
push ecx
|
||
@@:
|
||
cmp edi, ecx
|
||
jbe .skip
|
||
@@:
|
||
dec edi
|
||
mov al, [edi]
|
||
dec ebx
|
||
mov [ebx], al
|
||
mov byte [edi], ' '
|
||
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 ramdisk
|
||
; fs_RamdiskCreateFolder - create folder on ramdisk
|
||
;
|
||
; esi points to file/folder name
|
||
; ebx ignored (reserved)
|
||
; ecx number of bytes to write, 0+ (ignored for folders)
|
||
; edx mem location to data (ignored for folders)
|
||
;
|
||
; ret ebx = number of written bytes
|
||
; eax = 0 ok read or other = errormsg
|
||
;
|
||
;--------------------------------------------------------------
|
||
@@:
|
||
mov eax, ERROR_ACCESS_DENIED
|
||
xor ebx, ebx
|
||
ret
|
||
|
||
fs_RamdiskCreateFolder:
|
||
mov al, 1 ; create folder
|
||
jmp fs_RamdiskRewrite.common
|
||
|
||
fs_RamdiskRewrite:
|
||
xor eax, eax ; create file
|
||
.common:
|
||
cmp byte [esi], 0
|
||
jz @b
|
||
pushad
|
||
xor edi, edi
|
||
push esi
|
||
test ebp, ebp
|
||
jz @f
|
||
mov esi, ebp
|
||
@@:
|
||
lodsb
|
||
test al, al
|
||
jz @f
|
||
cmp al, '/'
|
||
jnz @b
|
||
lea edi, [esi-1]
|
||
jmp @b
|
||
@@:
|
||
pop esi
|
||
test edi, edi
|
||
jnz .noroot
|
||
test ebp, ebp
|
||
jnz .hasebp
|
||
push ramdisk_root_extend_dir
|
||
push ramdisk_root_next_write
|
||
push edi
|
||
push ramdisk_root_first
|
||
push ramdisk_root_next
|
||
jmp .common1
|
||
.hasebp:
|
||
mov eax, ERROR_ACCESS_DENIED
|
||
cmp byte [ebp], 0
|
||
jz .ret1
|
||
push ebp
|
||
xor ebp, ebp
|
||
call rd_find_lfn
|
||
pop esi
|
||
jc .notfound0
|
||
jmp .common0
|
||
.noroot:
|
||
mov eax, ERROR_ACCESS_DENIED
|
||
cmp byte [edi+1], 0
|
||
jz .ret1
|
||
; check existence
|
||
mov byte [edi], 0
|
||
push edi
|
||
call rd_find_lfn
|
||
pop esi
|
||
mov byte [esi], '/'
|
||
jnc @f
|
||
.notfound0:
|
||
mov eax, ERROR_FILE_NOT_FOUND
|
||
.ret1:
|
||
mov [esp+28], eax
|
||
popad
|
||
xor ebx, ebx
|
||
ret
|
||
@@:
|
||
inc esi
|
||
.common0:
|
||
test byte [edi+11], 0x10 ; must be directory
|
||
mov eax, ERROR_ACCESS_DENIED
|
||
jz .ret1
|
||
movzx ebp, word [edi+26] ; ebp=cluster
|
||
mov eax, ERROR_FAT_TABLE
|
||
cmp ebp, 2
|
||
jb .ret1
|
||
cmp ebp, 2849
|
||
jae .ret1
|
||
push ramdisk_notroot_extend_dir
|
||
push ramdisk_notroot_next_write
|
||
push ebp
|
||
push ramdisk_notroot_first
|
||
push ramdisk_notroot_next
|
||
.common1:
|
||
call fat_find_lfn
|
||
jc .notfound
|
||
; found
|
||
test byte [edi+11], 10h
|
||
jz .exists_file
|
||
; found directory; if we are creating directory, return OK,
|
||
; if we are creating file, say "access denied"
|
||
add esp, 20
|
||
popad
|
||
test al, al
|
||
mov eax, ERROR_ACCESS_DENIED
|
||
jz @f
|
||
mov al, 0
|
||
@@:
|
||
xor ebx, ebx
|
||
ret
|
||
.exists_file:
|
||
; found file; if we are creating directory, return "access denied",
|
||
; if we are creating file, delete existing file and continue
|
||
cmp byte [esp+20+28], 0
|
||
jz @f
|
||
add esp, 20
|
||
popad
|
||
mov eax, ERROR_ACCESS_DENIED
|
||
xor ebx, ebx
|
||
ret
|
||
@@:
|
||
; 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, [RAMDISK_FAT + 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
|
||
add esp, 20
|
||
popad
|
||
mov eax, ERROR_FILE_NOT_FOUND
|
||
xor ebx, ebx
|
||
ret
|
||
@@:
|
||
sub esp, 12
|
||
mov edi, esp
|
||
call fat_gen_short_name
|
||
.test_short_name_loop:
|
||
push esi edi ecx
|
||
mov esi, edi
|
||
lea eax, [esp+12+12+8]
|
||
mov [eax], ebp
|
||
call dword [eax-4]
|
||
jc .found
|
||
.test_short_name_entry:
|
||
cmp byte [edi+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:
|
||
lea eax, [esp+12+12+8]
|
||
call dword [eax-8]
|
||
jnc .test_short_name_entry
|
||
jmp .found
|
||
.short_name_found:
|
||
pop ecx edi esi
|
||
call fat_next_short_name
|
||
jnc .test_short_name_loop
|
||
.disk_full:
|
||
add esp, 12+20
|
||
popad
|
||
mov eax, ERROR_DISK_FULL
|
||
xor ebx, ebx
|
||
ret
|
||
.found:
|
||
pop ecx edi esi
|
||
; 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
|
||
movi eax, 1 ; 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:
|
||
push -1
|
||
push -1
|
||
; find <eax> successive entries in directory
|
||
xor ecx, ecx
|
||
push eax
|
||
lea eax, [esp+12+8+12+8]
|
||
mov [eax], ebp
|
||
call dword [eax-4]
|
||
pop eax
|
||
.scan_dir:
|
||
cmp byte [edi], 0
|
||
jz .free
|
||
cmp byte [edi], 0xE5
|
||
jz .free
|
||
xor ecx, ecx
|
||
.scan_cont:
|
||
push eax
|
||
lea eax, [esp+12+8+12+8]
|
||
call dword [eax-8]
|
||
pop eax
|
||
jnc .scan_dir
|
||
push eax
|
||
lea eax, [esp+12+8+12+8]
|
||
call dword [eax+8] ; extend directory
|
||
pop eax
|
||
jnc .scan_dir
|
||
add esp, 8+8+12+20
|
||
popad
|
||
mov eax, ERROR_DISK_FULL
|
||
xor ebx, ebx
|
||
ret
|
||
.free:
|
||
test ecx, ecx
|
||
jnz @f
|
||
mov [esp], edi
|
||
mov ecx, [esp+8+8+12+8]
|
||
mov [esp+4], ecx
|
||
xor ecx, ecx
|
||
@@:
|
||
inc ecx
|
||
cmp ecx, eax
|
||
jb .scan_cont
|
||
; found!
|
||
; If creating a directory, allocate one data cluster now and fail immediately
|
||
; if this is impossible. This prevents from creating an invalid directory entry
|
||
; on a full disk.
|
||
; yup, the argument is quite non-intuitive... but what should I do if
|
||
; the entire function uses such arguments? BTW, it refers to al from pushad,
|
||
; which in turn is filled with 0 in fs_RamdiskRewrite and 1 in fs_RamdiskCreateFolder.
|
||
push esi ecx
|
||
cmp byte [esp+24+12+20+28], 0
|
||
jz .no.preallocate.folder.data
|
||
mov ecx, 2849
|
||
mov edi, RAMDISK_FAT
|
||
xor eax, eax
|
||
repnz scasw
|
||
jz @f
|
||
add esp, 24
|
||
jmp .disk_full
|
||
@@:
|
||
mov [esp+24+12+20+20], edi ; store the cluster somewhere
|
||
.no.preallocate.folder.data:
|
||
; calculate name checksum
|
||
mov esi, [esp+8+8]
|
||
mov ecx, 11
|
||
xor eax, eax
|
||
@@:
|
||
ror al, 1
|
||
add al, [esi]
|
||
inc esi
|
||
loop @b
|
||
pop ecx esi
|
||
pop edi
|
||
pop dword [esp+8+12+8]
|
||
; edi points to last entry in free chunk
|
||
dec ecx
|
||
jz .nolfn
|
||
push esi
|
||
push eax
|
||
mov al, 40h
|
||
.writelfn:
|
||
or al, cl
|
||
mov esi, [esp+4]
|
||
push ecx
|
||
dec ecx
|
||
imul ecx, 13
|
||
add esi, ecx
|
||
stosb
|
||
mov cl, 5
|
||
call .read_symbols
|
||
mov ax, 0xF
|
||
stosw
|
||
mov al, [esp+4]
|
||
stosb
|
||
mov cl, 6
|
||
call .read_symbols
|
||
xor eax, eax
|
||
stosw
|
||
mov cl, 2
|
||
call .read_symbols
|
||
pop ecx
|
||
lea eax, [esp+8+8+12+8]
|
||
call dword [eax+4] ; next write
|
||
xor eax, eax
|
||
loop .writelfn
|
||
pop eax
|
||
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
|
||
cmp byte [esp+20+28], 0
|
||
jz .doit
|
||
; create directory
|
||
mov byte [edi+11], 10h ; attributes: folder
|
||
mov ecx, 32*2
|
||
mov edx, edi
|
||
push edx
|
||
push ecx
|
||
push edi
|
||
add edi, 26 ; edi points to low word of cluster
|
||
push edi
|
||
mov edi, [esp+16+20+20]
|
||
jmp .doit2
|
||
.doit:
|
||
push edx
|
||
push ecx
|
||
push edi
|
||
add edi, 26 ; edi points to low word of cluster
|
||
push edi
|
||
jecxz .done
|
||
mov ecx, 2849
|
||
mov edi, RAMDISK_FAT
|
||
.write_loop:
|
||
; allocate new cluster
|
||
xor eax, eax
|
||
repnz scasw
|
||
jnz .disk_full2
|
||
.doit2:
|
||
dec edi
|
||
dec edi
|
||
|
||
; lea eax, [edi-(RAMDISK_FAT)]
|
||
|
||
mov eax, edi
|
||
sub eax, RAMDISK_FAT
|
||
|
||
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
|
||
cmp byte [esp+16+20+28], 0
|
||
jnz .writedir
|
||
shl eax, 9
|
||
add eax, RAMDISK+31*512
|
||
.writefile:
|
||
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
|
||
sub ebx, edx
|
||
mov [edi+28], ebx
|
||
add esp, 20
|
||
mov [esp+16], ebx
|
||
popad
|
||
xor eax, eax
|
||
ret
|
||
.disk_full2:
|
||
mov ebx, edx
|
||
pop edi edi ecx edx
|
||
sub ebx, edx
|
||
mov [edi+28], ebx
|
||
add esp, 20
|
||
mov [esp+16], ebx
|
||
popad
|
||
movi eax, ERROR_DISK_FULL
|
||
ret
|
||
.writedir:
|
||
mov edi, eax
|
||
shl edi, 9
|
||
add edi, RAMDISK+31*512
|
||
mov esi, edx
|
||
mov ecx, 32/4
|
||
push ecx
|
||
rep movsd
|
||
mov dword [edi-32], '. '
|
||
mov dword [edi-32+4], ' '
|
||
mov dword [edi-32+8], ' '
|
||
mov byte [edi-32+11], 10h
|
||
mov word [edi-32+26], ax
|
||
mov esi, edx
|
||
pop ecx
|
||
rep movsd
|
||
mov dword [edi-32], '.. '
|
||
mov dword [edi-32+4], ' '
|
||
mov dword [edi-32+8], ' '
|
||
mov byte [edi-32+11], 10h
|
||
mov eax, [esp+16+8]
|
||
mov word [edi-32+26], ax
|
||
xor eax, eax
|
||
mov ecx, (512-32*2)/4
|
||
rep stosd
|
||
pop edi edi ecx edx
|
||
add esp, 20
|
||
popad
|
||
xor eax, eax
|
||
xor ebx, ebx
|
||
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
|
||
|
||
;----------------------------------------------------------------
|
||
;
|
||
; fs_RamdiskWrite - LFN variant for writing to 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 write, 0+
|
||
; edx mem location to data
|
||
;
|
||
; ret ebx = bytes written (maybe 0)
|
||
; eax = 0 ok write or other = errormsg
|
||
;
|
||
;--------------------------------------------------------------
|
||
@@:
|
||
push ERROR_ACCESS_DENIED
|
||
fs_RamdiskWrite.ret0:
|
||
pop eax
|
||
xor ebx, ebx
|
||
ret
|
||
|
||
fs_RamdiskWrite:
|
||
cmp byte [esi], 0
|
||
jz @b
|
||
pushad
|
||
call rd_find_lfn
|
||
jnc .found
|
||
popad
|
||
push ERROR_FILE_NOT_FOUND
|
||
jmp .ret0
|
||
.found:
|
||
; must not be directory
|
||
test byte [edi+11], 10h
|
||
jz @f
|
||
popad
|
||
push ERROR_ACCESS_DENIED
|
||
jmp .ret0
|
||
@@:
|
||
; FAT does not support files larger than 4GB
|
||
test ebx, ebx
|
||
jz .l1
|
||
cmp dword [ebx+4], 0
|
||
jz @f
|
||
.eof:
|
||
popad
|
||
push ERROR_END_OF_FILE
|
||
jmp .ret0
|
||
@@:
|
||
mov ebx, [ebx]
|
||
.l1:
|
||
; now edi points to direntry, ebx=start byte to write,
|
||
; ecx=number of bytes to write, edx=data pointer
|
||
call fat_update_datetime
|
||
|
||
; extend file if needed
|
||
add ecx, ebx
|
||
jc .eof ; FAT does not support files larger than 4GB
|
||
push 0 ; return value=0
|
||
cmp ecx, [edi+28]
|
||
jbe .length_ok
|
||
cmp ecx, ebx
|
||
jz .length_ok
|
||
call ramdisk_extend_file
|
||
jnc .length_ok
|
||
; ramdisk_extend_file can return two error codes: FAT table error or disk full.
|
||
; First case is fatal error, in second case we may write some data
|
||
mov [esp], eax
|
||
cmp al, ERROR_DISK_FULL
|
||
jz .disk_full
|
||
pop eax
|
||
mov [esp+28], eax
|
||
popad
|
||
xor ebx, ebx
|
||
ret
|
||
.disk_full:
|
||
; correct number of bytes to write
|
||
mov ecx, [edi+28]
|
||
cmp ecx, ebx
|
||
ja .length_ok
|
||
.ret:
|
||
pop eax
|
||
mov [esp+28], eax ; eax=return value
|
||
sub edx, [esp+20]
|
||
mov [esp+16], edx ; ebx=number of written bytes
|
||
popad
|
||
ret
|
||
.length_ok:
|
||
; now ebx=start pos, ecx=end pos, both lie inside file
|
||
sub ecx, ebx
|
||
jz .ret
|
||
movzx edi, word [edi+26] ; starting cluster
|
||
.write_loop:
|
||
sub ebx, 0x200
|
||
jae .next_cluster
|
||
push ecx
|
||
neg ebx
|
||
cmp ecx, ebx
|
||
jbe @f
|
||
mov ecx, ebx
|
||
@@:
|
||
mov eax, edi
|
||
shl eax, 9
|
||
add eax, RAMDISK+31*512+0x200
|
||
sub eax, ebx
|
||
mov ebx, eax
|
||
mov eax, edx
|
||
call memmove
|
||
xor ebx, ebx
|
||
add edx, ecx
|
||
sub [esp], ecx
|
||
pop ecx
|
||
jz .ret
|
||
.next_cluster:
|
||
movzx edi, word [edi*2+RAMDISK_FAT]
|
||
jmp .write_loop
|
||
|
||
ramdisk_extend_file.zero_size:
|
||
xor eax, eax
|
||
jmp ramdisk_extend_file.start_extend
|
||
|
||
; extends file on ramdisk to given size, new data area is filled by 0
|
||
; in: edi->direntry, ecx=new size
|
||
; out: CF=0 => OK, eax=0
|
||
; CF=1 => error, eax=code (ERROR_FAT_TABLE or ERROR_DISK_FULL)
|
||
ramdisk_extend_file:
|
||
push ecx
|
||
; find the last cluster of file
|
||
movzx eax, word [edi+26] ; first cluster
|
||
mov ecx, [edi+28]
|
||
jecxz .zero_size
|
||
@@:
|
||
sub ecx, 0x200
|
||
jbe @f
|
||
mov eax, [eax*2+RAMDISK_FAT]
|
||
and eax, 0xFFF
|
||
jz .fat_err
|
||
cmp eax, 0xFF8
|
||
jb @b
|
||
.fat_err:
|
||
pop ecx
|
||
movi eax, ERROR_FAT_TABLE
|
||
stc
|
||
ret
|
||
@@:
|
||
push eax
|
||
mov eax, [eax*2+RAMDISK_FAT]
|
||
and eax, 0xFFF
|
||
cmp eax, 0xFF8
|
||
pop eax
|
||
jb .fat_err
|
||
; set length to full number of sectors and make sure that last sector is zero-padded
|
||
sub [edi+28], ecx
|
||
push eax edi
|
||
mov edi, eax
|
||
shl edi, 9
|
||
lea edi, [edi+RAMDISK+31*512+0x200+ecx]
|
||
neg ecx
|
||
xor eax, eax
|
||
rep stosb
|
||
pop edi eax
|
||
.start_extend:
|
||
pop ecx
|
||
; now do extend
|
||
push edx esi
|
||
mov esi, RAMDISK_FAT+2*2 ; start scan from cluster 2
|
||
mov edx, 2847 ; number of clusters to scan
|
||
.extend_loop:
|
||
cmp [edi+28], ecx
|
||
jae .extend_done
|
||
; add new sector
|
||
push ecx
|
||
mov ecx, edx
|
||
push edi
|
||
mov edi, esi
|
||
jecxz .disk_full
|
||
push eax
|
||
xor eax, eax
|
||
repnz scasw
|
||
pop eax
|
||
jnz .disk_full
|
||
mov word [edi-2], 0xFFF
|
||
mov esi, edi
|
||
mov edx, ecx
|
||
sub edi, RAMDISK_FAT
|
||
shr edi, 1
|
||
dec edi ; now edi=new cluster
|
||
test eax, eax
|
||
jz .first_cluster
|
||
mov [RAMDISK_FAT+eax*2], di
|
||
jmp @f
|
||
.first_cluster:
|
||
pop eax ; eax->direntry
|
||
push eax
|
||
mov [eax+26], di
|
||
@@:
|
||
push edi
|
||
shl edi, 9
|
||
add edi, RAMDISK+31*512
|
||
xor eax, eax
|
||
mov ecx, 512/4
|
||
rep stosd
|
||
pop eax ; eax=new cluster
|
||
pop edi ; edi->direntry
|
||
pop ecx ; ecx=required size
|
||
add dword [edi+28], 0x200
|
||
jmp .extend_loop
|
||
.extend_done:
|
||
mov [edi+28], ecx
|
||
pop esi edx
|
||
xor eax, eax ; CF=0
|
||
ret
|
||
.disk_full:
|
||
pop edi ecx
|
||
pop esi edx
|
||
stc
|
||
movi eax, ERROR_DISK_FULL
|
||
ret
|
||
|
||
fat_update_datetime:
|
||
call get_time_for_file
|
||
mov [edi+22], ax ; last write time
|
||
call get_date_for_file
|
||
mov [edi+24], ax ; last write date
|
||
mov [edi+18], ax ; last access date
|
||
ret
|
||
|
||
;----------------------------------------------------------------
|
||
;
|
||
; fs_RamdiskSetFileEnd - set end of file on ramdisk
|
||
;
|
||
; esi points to filename
|
||
; ebx points to 64-bit number = new file size
|
||
; ecx ignored (reserved)
|
||
; edx ignored (reserved)
|
||
;
|
||
; ret eax = 0 ok or other = errormsg
|
||
;
|
||
;--------------------------------------------------------------
|
||
fs_RamdiskSetFileEnd:
|
||
cmp byte [esi], 0
|
||
jnz @f
|
||
.access_denied:
|
||
push ERROR_ACCESS_DENIED
|
||
jmp .ret
|
||
@@:
|
||
push edi
|
||
call rd_find_lfn
|
||
jnc @f
|
||
pop edi
|
||
push ERROR_FILE_NOT_FOUND
|
||
.ret:
|
||
pop eax
|
||
ret
|
||
@@:
|
||
; must not be directory
|
||
test byte [edi+11], 10h
|
||
jz @f
|
||
pop edi
|
||
jmp .access_denied
|
||
@@:
|
||
; file size must not exceed 4Gb
|
||
cmp dword [ebx+4], 0
|
||
jz @f
|
||
pop edi
|
||
push ERROR_END_OF_FILE
|
||
jmp .ret
|
||
@@:
|
||
; set file modification date/time to current
|
||
call fat_update_datetime
|
||
mov eax, [ebx]
|
||
cmp eax, [edi+28]
|
||
jb .truncate
|
||
ja .expand
|
||
pop edi
|
||
xor eax, eax
|
||
ret
|
||
.expand:
|
||
push ecx
|
||
mov ecx, eax
|
||
call ramdisk_extend_file
|
||
pop ecx
|
||
pop edi
|
||
ret
|
||
.truncate:
|
||
mov [edi+28], eax
|
||
push ecx
|
||
movzx ecx, word [edi+26]
|
||
test eax, eax
|
||
jz .zero_size
|
||
; find new last sector
|
||
@@:
|
||
sub eax, 0x200
|
||
jbe @f
|
||
movzx ecx, word [RAMDISK_FAT+ecx*2]
|
||
jmp @b
|
||
@@:
|
||
; zero data at the end of last sector
|
||
push ecx
|
||
mov edi, ecx
|
||
shl edi, 9
|
||
lea edi, [edi+RAMDISK+31*512+eax+0x200]
|
||
mov ecx, eax
|
||
neg ecx
|
||
xor eax, eax
|
||
rep stosb
|
||
pop ecx
|
||
; terminate FAT chain
|
||
lea ecx, [RAMDISK_FAT+ecx+ecx]
|
||
push dword [ecx]
|
||
mov word [ecx], 0xFFF
|
||
pop ecx
|
||
and ecx, 0xFFF
|
||
jmp .delete
|
||
.zero_size:
|
||
and word [edi+26], 0
|
||
.delete:
|
||
; delete FAT chain starting with ecx
|
||
; mark all clusters as free
|
||
cmp ecx, 0xFF8
|
||
jae .deleted
|
||
lea ecx, [RAMDISK_FAT+ecx+ecx]
|
||
push dword [ecx]
|
||
and word [ecx], 0
|
||
pop ecx
|
||
and ecx, 0xFFF
|
||
jmp .delete
|
||
.deleted:
|
||
pop ecx
|
||
pop edi
|
||
xor eax, eax
|
||
ret
|
||
|
||
fs_RamdiskGetFileInfo:
|
||
cmp byte [esi], 0
|
||
jnz @f
|
||
mov eax, 2 ; unsupported
|
||
ret
|
||
@@:
|
||
push edi
|
||
call rd_find_lfn
|
||
fs_GetFileInfo_finish:
|
||
jnc @f
|
||
pop edi
|
||
mov eax, ERROR_FILE_NOT_FOUND
|
||
ret
|
||
@@:
|
||
push esi ebp
|
||
xor ebp, ebp
|
||
mov esi, edx
|
||
and dword [esi+4], 0
|
||
call fat_entry_to_bdfe2
|
||
pop ebp esi
|
||
pop edi
|
||
xor eax, eax
|
||
ret
|
||
|
||
fs_RamdiskSetFileInfo:
|
||
cmp byte [esi], 0
|
||
jnz @f
|
||
mov eax, 2 ; unsupported
|
||
ret
|
||
@@:
|
||
push edi
|
||
call rd_find_lfn
|
||
jnc @f
|
||
pop edi
|
||
mov eax, ERROR_FILE_NOT_FOUND
|
||
ret
|
||
@@:
|
||
call bdfe_to_fat_entry
|
||
pop edi
|
||
xor eax, eax
|
||
ret
|
||
|
||
;----------------------------------------------------------------
|
||
;
|
||
; fs_RamdiskDelete - delete file or empty folder from ramdisk
|
||
;
|
||
; esi points to filename
|
||
;
|
||
; ret eax = 0 ok or other = errormsg
|
||
;
|
||
;--------------------------------------------------------------
|
||
fs_RamdiskDelete:
|
||
cmp byte [esi], 0
|
||
jnz @f
|
||
; cannot delete root!
|
||
.access_denied:
|
||
push ERROR_ACCESS_DENIED
|
||
.pop_ret:
|
||
pop eax
|
||
ret
|
||
@@:
|
||
and [rd_prev_sector], 0
|
||
and [rd_prev_prev_sector], 0
|
||
push edi
|
||
call rd_find_lfn
|
||
jnc .found
|
||
pop edi
|
||
push ERROR_FILE_NOT_FOUND
|
||
jmp .pop_ret
|
||
.found:
|
||
cmp dword [edi], '. '
|
||
jz .access_denied2
|
||
cmp dword [edi], '.. '
|
||
jz .access_denied2
|
||
test byte [edi+11], 10h
|
||
jz .dodel
|
||
; we can delete only empty folders!
|
||
movzx eax, word [edi+26]
|
||
push ebx
|
||
mov ebx, eax
|
||
shl ebx, 9
|
||
add ebx, RAMDISK + 31*0x200 + 2*0x20
|
||
.checkempty:
|
||
cmp byte [ebx], 0
|
||
jz .empty
|
||
cmp byte [ebx], 0xE5
|
||
jnz .notempty
|
||
add ebx, 0x20
|
||
test ebx, 0x1FF
|
||
jnz .checkempty
|
||
movzx eax, word [RAMDISK_FAT + eax*2]
|
||
test eax, eax
|
||
jz .empty
|
||
mov ebx, eax
|
||
shl ebx, 9
|
||
add ebx, RAMDISK + 31*0x200
|
||
jmp .checkempty
|
||
.notempty:
|
||
pop ebx
|
||
.access_denied2:
|
||
pop edi
|
||
jmp .access_denied
|
||
.empty:
|
||
pop ebx
|
||
.dodel:
|
||
movzx eax, word [edi+26]
|
||
; delete folder entry
|
||
mov byte [edi], 0xE5
|
||
; delete LFN (if present)
|
||
.lfndel:
|
||
test edi, 0x1FF
|
||
jnz @f
|
||
cmp [rd_prev_sector], 0
|
||
jz @f
|
||
cmp [rd_prev_sector], -1
|
||
jz .lfndone
|
||
mov edi, [rd_prev_sector]
|
||
push [rd_prev_prev_sector]
|
||
pop [rd_prev_sector]
|
||
or [rd_prev_prev_sector], -1
|
||
shl edi, 9
|
||
add edi, RAMDISK + 31*0x200 + 0x200
|
||
@@:
|
||
sub edi, 0x20
|
||
cmp byte [edi], 0xE5
|
||
jz .lfndone
|
||
cmp byte [edi+11], 0xF
|
||
jnz .lfndone
|
||
mov byte [edi], 0xE5
|
||
jmp .lfndel
|
||
.lfndone:
|
||
; delete FAT chain
|
||
cmp eax, 2
|
||
jb .done
|
||
cmp eax, 0xFF8
|
||
jae .done
|
||
lea eax, [RAMDISK_FAT + eax*2]
|
||
push dword [eax]
|
||
and word [eax], 0
|
||
pop eax
|
||
and eax, 0xFFF
|
||
jmp .lfndone
|
||
.done:
|
||
pop edi
|
||
xor eax, eax
|
||
ret
|
||
|
||
; \end{diamond}
|