2011-10-14 23:38:50 +02:00
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; Copyright (c) 2008-2009, diamond
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; All rights reserved.
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;
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions are met:
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; * Redistributions of source code must retain the above copyright
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; notice, this list of conditions and the following disclaimer.
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; * Redistributions in binary form must reproduce the above copyright
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; notice, this list of conditions and the following disclaimer in the
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; documentation and/or other materials provided with the distribution.
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; * Neither the name of the <organization> nor the
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; names of its contributors may be used to endorse or promote products
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; derived from this software without specific prior written permission.
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;
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; THIS SOFTWARE IS PROVIDED BY Alexey Teplov aka <Lrz> ''AS IS'' AND ANY
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; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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; DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
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; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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; (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;*****************************************************************************
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restore_usa:
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; Update Sequence Array restore
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; in: ds:bx -> USA-protected structure
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push bx
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lea di, [bx+1feh]
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mov cx, [bx+6]
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add bx, [bx+4]
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dec cx
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@@:
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mov ax, [bx+2]
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mov [di], ax
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inc bx
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inc bx
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add di, 200h
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loop @b
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pop bx
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ret
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find_attr:
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; in: ds:di->file record, ax=attribute
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; out: ds:di->attribute or di=0 if not found
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add di, [di+14h]
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.1:
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; attributes' codes are formally dwords, but all of them fit in word
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cmp word [di], -1
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jz .notfound
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cmp word [di], ax
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jnz .continue
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; for $DATA attribute, scan only unnamed
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cmp ax, 80h
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jnz .found
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cmp byte [di+9], 0
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jz .found
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.continue:
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add di, [di+4]
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jmp .1
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.notfound:
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xor di, di
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.found:
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ret
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process_mcb_nonres:
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; in: ds:si->attribute, es:di->buffer
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; out: es:di->buffer end
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pushad
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pop di
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add si, [si+20h]
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xor ebx, ebx
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.loop:
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lodsb
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test al, al
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jz .done
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push invalid_read_request_string
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movzx cx, al
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shr cx, 4
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jz find_error_sp
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xchg ax, dx
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and dx, 0Fh
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jz find_error_sp
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add si, cx
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add si, dx
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pop ax
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push si
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dec si
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movsx eax, byte [si]
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dec cx
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jz .l1e
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.l1:
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dec si
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shl eax, 8
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mov al, [si]
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loop .l1
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.l1e:
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xchg ebp, eax
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dec si
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movsx eax, byte [si]
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mov cx, dx
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dec cx
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jz .l2e
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.l2:
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dec si
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shl eax, 8
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mov al, byte [si]
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loop .l2
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.l2e:
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pop si
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add ebx, ebp
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; eax=length, ebx=disk block
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stosd
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mov eax, ebx
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stosd
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cmp di, 0x8000 - 12
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jbe .loop
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..attr_overflow:
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mov si, fragmented_string
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jmp find_error_si
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.done:
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xor ax, ax
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stosw
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stosw
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push di
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popad
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ret
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load_attr:
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; in: ax=attribute, ds:bx->base record
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; out: if found: CF=0, attribute loaded to [freeattr], [freeattr] updated,
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; edx=size of attribute in bytes
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; out: if not found: CF=1
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mov di, [bp + freeattr - dat]
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push ss
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pop es
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mov byte [es:di], 1
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inc di
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cmp di, 0x8000 - 12
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ja ..attr_overflow
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or edx, -1 ; file size is not known yet
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; scan for attribute
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push di
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mov di, bx
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add di, [di+14h]
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@@:
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call find_attr.1
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test di, di
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jz .notfound1
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cmp byte [di+8], 0
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jnz .nonresident
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mov si, di
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pop di
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push ds
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jmp .resident
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.aux_resident:
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mov ax, ds
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mov si, di
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pop di ds bx ds edx
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push ss
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pop es
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push ds
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mov ds, ax
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; resident attribute
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.resident:
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dec di
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mov al, 0
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stosb
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mov ax, [si+10h]
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stosw
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push di
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add di, ax
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cmp di, 0x8000 - 12
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pop di
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ja ..attr_overflow
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movzx edx, ax ; length of attribute
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xchg ax, cx
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add si, [si+14h]
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rep movsb
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mov [bp + freeattr - dat], di
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pop ds
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ret
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.nonresident:
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; nonresident attribute
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cmp dword [di+10h], 0
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jnz @b
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; read start of data
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mov si, di
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mov edx, [di+30h] ; size of attribute
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pop di
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call process_mcb_nonres
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sub di, 4
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push di
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.notfound1:
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pop di
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push edx
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; $ATTRIBUTE_LIST is always in base file record
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cmp ax, 20h
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jz .nofragmented
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; try to load $ATTRIBUTE_LIST = 20h
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push ax
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mov ax, 20h
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push [bp + freeattr - dat]
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mov [bp + freeattr - dat], di
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push di
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call load_attr
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pop di
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pop [bp + freeattr - dat]
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pop ax
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jc .nofragmented
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push ds bx
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pusha
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mov si, di
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push ss
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pop ds
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push 0x8100
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pop es
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xor ecx, ecx
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mov cl, 0x78
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xor bx, bx
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push es
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call read_file_chunk
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pop ds
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jc ..found_disk_error
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test cx, cx
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jz ..attr_overflow
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popa
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push ss
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pop es
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xor bx, bx
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.1:
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cmp [bx], ax
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jnz .continue1
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; only unnamed $DATA attributes!
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cmp ax, 80h
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jnz @f
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cmp byte [bx+6], 0
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jnz .continue1
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@@:
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cmp dword [bx+10h], 0
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jz .continue1
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cmp dword [bx+8], 0
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jnz @f
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dec di
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cmp di, [bp + freeattr - dat]
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lea di, [di+1]
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jnz .continue1
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@@:
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push ds di
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push ax
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mov eax, [bx+10h]
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mov ecx, [bx+8]
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call read_file_record
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pop ax
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mov di, [14h]
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.2:
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call find_attr.1
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cmp byte [di+8], 0
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jz .aux_resident
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cmp dword [di+10h], ecx
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jnz .2
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mov si, di
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mov di, sp
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cmp dword [ss:di+8], -1
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jnz @f
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push dword [si+30h] ; size of attribute
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pop dword [ss:di+8]
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@@:
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pop di
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call process_mcb_nonres
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sub di, 4
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pop ds
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.continue1:
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add bx, [bx+4]
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cmp bx, dx
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jb .1
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pop bx ds
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.nofragmented:
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pop edx
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dec di
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cmp di, [bp + freeattr - dat]
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jnz @f
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stc
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ret
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@@:
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inc di
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xor ax, ax
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stosw
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stosw
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mov [bp + freeattr - dat], di
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ret
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read_file_record:
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; in: eax = index of record
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; out: ds:0 -> record
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; find place in cache
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push di
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push si
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mov si, cache1head
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call cache_lookup
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pop si
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pushf
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sub di, 3400h
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shl di, 10-3
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add di, 0x6000
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mov ds, di
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popf
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pop di
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jnc .noread
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; read file record <eax> to ds:0
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pushad
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push ds
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push es
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movzx ecx, [bp + frs_size - dat]
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shr cx, 9
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mul ecx
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push ds
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pop es
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push ss
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pop ds
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mov si, 0x4000
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xor bx, bx
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push [bp + cur_obj - dat]
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mov [bp + cur_obj - dat], mft_string
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push es
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call read_attr
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; initialize cache for $INDEX_ALLOCATION for this record
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pop si
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push si
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sub si, 0x6000
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mov ax, si
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shr si, 10-3
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shr ax, 2
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add si, 3480h
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add ax, 3500h
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mov [si], si
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mov [si+2], si
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mov [si+4], ax
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pop ds
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call restore_usa
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pop [bp + cur_obj - dat]
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pop es
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pop ds
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popad
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.noread:
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ret
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read_attr:
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; in: eax = offset in sectors, ecx = size in sectors (<10000h), es:bx -> buffer, ds:si -> attribute
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push invalid_read_request_string
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cmp byte [si], 0
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jnz .nonresident
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cmp eax, 10000h shr 9
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jae find_error_sp
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shl ax, 9
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shl cx, 9
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cmp ax, [si+2]
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jae find_error_sp
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cmp cx, [si+2]
|
|
|
|
|
ja find_error_sp
|
|
|
|
|
add si, 3
|
|
|
|
|
add si, ax
|
|
|
|
|
mov di, bx
|
|
|
|
|
rep movsb
|
|
|
|
|
pop ax
|
|
|
|
|
ret
|
|
|
|
|
.nonresident:
|
|
|
|
|
inc si
|
|
|
|
|
.loop:
|
|
|
|
|
mov edx, dword [si]
|
|
|
|
|
add si, 8
|
|
|
|
|
test edx, edx
|
|
|
|
|
jz find_error_sp
|
|
|
|
|
imul edx, [bp + sect_per_clust - dat]
|
|
|
|
|
sub eax, edx
|
|
|
|
|
jnc .loop
|
|
|
|
|
add eax, edx
|
|
|
|
|
sub edx, eax
|
|
|
|
|
push cx
|
|
|
|
|
cmp ecx, edx
|
|
|
|
|
jb @f
|
|
|
|
|
mov cx, dx
|
|
|
|
|
@@:
|
|
|
|
|
push bx
|
|
|
|
|
mov ebx, [si-4]
|
|
|
|
|
imul ebx, [bp + sect_per_clust - dat]
|
|
|
|
|
add eax, ebx
|
|
|
|
|
pop bx
|
|
|
|
|
call read
|
|
|
|
|
jc ..found_disk_error
|
|
|
|
|
mov dx, cx
|
|
|
|
|
pop cx
|
|
|
|
|
xor eax, eax
|
|
|
|
|
sub cx, dx
|
|
|
|
|
jnz .loop
|
|
|
|
|
pop ax
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
load_file_ntfs:
|
|
|
|
|
; in: ss:bp = 0:dat
|
|
|
|
|
; in: es:bx = address to load file
|
|
|
|
|
; in: ds:si -> ASCIIZ name
|
|
|
|
|
; in: cx = limit in sectors
|
|
|
|
|
; out: bx = status: bx=0 - ok, bx=1 - file is too big, only part has been loaded, bx=2 - file not found
|
|
|
|
|
; out: dx:ax = file size (0xFFFFFFFF if file not found)
|
|
|
|
|
push es bx cx
|
|
|
|
|
mov eax, 5 ; root cluster
|
|
|
|
|
mov [bp + cur_obj - dat], root_string
|
|
|
|
|
.parse_dir_loop:
|
|
|
|
|
push ds si
|
|
|
|
|
call read_file_record
|
|
|
|
|
; find attributes $INDEX_ROOT, $INDEX_ALLOCATION, $BITMAP
|
|
|
|
|
mov ax, [bp + freeattr - dat]
|
|
|
|
|
mov [bp + index_root - dat], ax
|
|
|
|
|
mov ax, 90h ; $INDEX_ROOT
|
|
|
|
|
xor bx, bx
|
|
|
|
|
call load_attr
|
|
|
|
|
mov si, noindex_string
|
|
|
|
|
jc find_error_si
|
|
|
|
|
mov ax, [bp + freeattr - dat]
|
|
|
|
|
mov [bp + index_alloc - dat], ax
|
|
|
|
|
mov ax, 0A0h ; $INDEX_ALLOCATION
|
|
|
|
|
call load_attr
|
|
|
|
|
jnc @f
|
|
|
|
|
mov [bp + index_alloc - dat], bx
|
|
|
|
|
@@:
|
|
|
|
|
push ds
|
|
|
|
|
; search for entry
|
|
|
|
|
mov si, [bp + index_root - dat]
|
|
|
|
|
push ss
|
|
|
|
|
pop ds
|
|
|
|
|
push 0x8100
|
|
|
|
|
pop es
|
|
|
|
|
xor ecx, ecx
|
|
|
|
|
mov cl, 0x78
|
|
|
|
|
xor bx, bx
|
|
|
|
|
push es
|
|
|
|
|
call read_file_chunk
|
|
|
|
|
pop ds
|
|
|
|
|
jc ..found_disk_error
|
|
|
|
|
test cx, cx
|
|
|
|
|
jz ..attr_overflow
|
|
|
|
|
mov si, invalid_read_request_string
|
|
|
|
|
cmp word [bx+10], 0
|
|
|
|
|
jnz find_error_si
|
|
|
|
|
; calculate number of items in cache
|
|
|
|
|
mov di, [bx+8] ; subnode_size
|
|
|
|
|
mov ax, 0x4000
|
|
|
|
|
sub ax, word [bp + frs_size - dat]
|
|
|
|
|
cwd
|
|
|
|
|
div di
|
|
|
|
|
test ax, ax
|
|
|
|
|
jz find_error_si
|
|
|
|
|
mov si, invalid_volume_msg
|
|
|
|
|
test di, 0x1FF
|
|
|
|
|
jnz find_error_si
|
|
|
|
|
pop cx
|
|
|
|
|
mov [bp + cur_index_seg - dat], cx
|
|
|
|
|
shl ax, 3
|
|
|
|
|
sub cx, 6000h
|
|
|
|
|
mov si, cx
|
|
|
|
|
shr cx, 2
|
|
|
|
|
shr si, 10-3
|
|
|
|
|
add cx, ax
|
|
|
|
|
add si, 3480h
|
|
|
|
|
mov [bp + cur_index_cache - dat], si
|
|
|
|
|
add cx, 3500h
|
|
|
|
|
mov [ss:si+6], cx
|
|
|
|
|
mov dx, di
|
|
|
|
|
add bx, 10h
|
|
|
|
|
.scan_record:
|
|
|
|
|
add bx, [bx]
|
|
|
|
|
.scan:
|
|
|
|
|
test byte [bx+0Ch], 2
|
|
|
|
|
jnz .look_child
|
|
|
|
|
movzx cx, byte [bx+50h] ; namelen
|
|
|
|
|
lea di, [bx+52h] ; name
|
|
|
|
|
push ds
|
|
|
|
|
pop es
|
|
|
|
|
pop si ds
|
|
|
|
|
push ds si
|
|
|
|
|
xor ax, ax
|
|
|
|
|
.1:
|
|
|
|
|
lodsb
|
|
|
|
|
cmp al, '/'
|
|
|
|
|
jnz @f
|
|
|
|
|
mov al, 0
|
|
|
|
|
@@:
|
|
|
|
|
cmp al, 'A'
|
|
|
|
|
jb .nocapital
|
|
|
|
|
cmp al, 'Z'
|
|
|
|
|
ja .nocapital
|
|
|
|
|
or al, 20h
|
|
|
|
|
.nocapital:
|
|
|
|
|
cmp al, 'a'
|
|
|
|
|
jb .notletter
|
|
|
|
|
cmp al, 'z'
|
|
|
|
|
ja .notletter
|
|
|
|
|
or byte [es:di], 20h
|
|
|
|
|
.notletter:
|
|
|
|
|
scasw
|
|
|
|
|
loopz .1
|
|
|
|
|
jb .look_child
|
|
|
|
|
ja @f
|
|
|
|
|
cmp byte [si], 0
|
|
|
|
|
jz .file_found
|
|
|
|
|
cmp byte [si], '/'
|
|
|
|
|
jz .file_found
|
|
|
|
|
@@:
|
|
|
|
|
push es
|
|
|
|
|
pop ds
|
|
|
|
|
add bx, [bx+8]
|
|
|
|
|
jmp .scan
|
|
|
|
|
.look_child:
|
|
|
|
|
push es
|
|
|
|
|
pop ds
|
|
|
|
|
test byte [bx+0Ch], 1
|
|
|
|
|
jz .not_found
|
|
|
|
|
mov si, [bp + index_alloc - dat]
|
|
|
|
|
test si, si
|
|
|
|
|
jz .not_found
|
|
|
|
|
add bx, [bx+8]
|
|
|
|
|
mov eax, [bx-8]
|
|
|
|
|
mov es, [bp + cur_index_seg - dat]
|
|
|
|
|
push si
|
|
|
|
|
mov si, [bp + cur_index_cache - dat]
|
|
|
|
|
call cache_lookup
|
|
|
|
|
pop si
|
|
|
|
|
pushf
|
|
|
|
|
mov bx, di
|
|
|
|
|
mov bh, 0
|
|
|
|
|
shr bx, 3
|
|
|
|
|
imul bx, dx
|
|
|
|
|
add bx, [bp + frs_size - dat]
|
|
|
|
|
popf
|
|
|
|
|
jnc .noread
|
|
|
|
|
push es
|
|
|
|
|
push dx
|
|
|
|
|
push ss
|
|
|
|
|
pop ds
|
|
|
|
|
movzx ecx, dx
|
|
|
|
|
shr cx, 9
|
|
|
|
|
mul [bp + sect_per_clust - dat]
|
|
|
|
|
call read_attr
|
|
|
|
|
pop dx
|
|
|
|
|
pop es
|
|
|
|
|
push es
|
|
|
|
|
pop ds
|
|
|
|
|
call restore_usa
|
|
|
|
|
.noread:
|
|
|
|
|
push es
|
|
|
|
|
pop ds
|
|
|
|
|
add bx, 18h
|
|
|
|
|
jmp .scan_record
|
|
|
|
|
.not_found:
|
|
|
|
|
pop [bp + cur_obj - dat]
|
|
|
|
|
mov si, error_not_found
|
|
|
|
|
jmp find_error_si
|
|
|
|
|
.file_found:
|
|
|
|
|
pop [bp + cur_obj - dat]
|
|
|
|
|
pop cx
|
|
|
|
|
mov ax, [bp + index_root - dat]
|
|
|
|
|
mov [bp + freeattr - dat], ax
|
|
|
|
|
mov eax, [es:bx]
|
|
|
|
|
test byte [es:bx+48h+3], 10h
|
|
|
|
|
jz .regular_file
|
|
|
|
|
cmp byte [si], 0
|
|
|
|
|
jz ..directory_error
|
|
|
|
|
inc si
|
|
|
|
|
jmp .parse_dir_loop
|
|
|
|
|
.regular_file:
|
|
|
|
|
cmp byte [si], 0
|
|
|
|
|
jnz ..notdir_error
|
|
|
|
|
; read entry
|
|
|
|
|
call read_file_record
|
|
|
|
|
xor bx, bx
|
|
|
|
|
mov ax, 80h
|
|
|
|
|
call load_attr
|
|
|
|
|
mov si, nodata_string
|
|
|
|
|
jc find_error_si
|
|
|
|
|
mov si, [bp + index_root - dat]
|
|
|
|
|
mov [bp + freeattr - dat], si
|
|
|
|
|
push ss
|
|
|
|
|
pop ds
|
|
|
|
|
jmp load_file_common_end
|
