1044 lines
18 KiB
NASM
1044 lines
18 KiB
NASM
.model tiny
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.486
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smart
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.code
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org 0100h
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include ..\include\fat.h
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start:
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jmp tsr ;Saute à la routine résidente
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names db 'DRIVE' ;Nom drivers
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id dw 1234h ;Identifiant drivers
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Tsr:
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cli ;Désactive interruptions logiciellement
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cmp ax,cs:ID ;Compare si test de chargement
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jne nomore ;Si pas test alors on continu
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rol ax,3*4 ;Rotation de 3 chiffre de l'ID pour montrer que le drivers est chargé
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jmp itsok ;On termine l'int avec notre code d'ID preuve du bon chargement de VIDEO
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nomore:
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cmp ah,maxfunc
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jbe noerrorint
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stc
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jmp itsok
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noerrorint:
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clc
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push bx
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mov bl,ah ;On calcule d'aprés le n° de fonction
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xor bh,bh ;quel sera l'entrée dans la table indexée
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shl bx,1 ;des adresses fonctions.
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mov bx,cs:[bx+tables] ;On récupère cette adresse depuis la table
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mov cs:current,bx ;On la stocke temporairement pour obtenir les registres d'origine
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pop bx
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clc
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call cs:current ;Puis on execute la fonction
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itsok:
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push bp
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mov bp,sp ;On prend sp dans bp pour adresser la pile
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jnc noerror ;La fonction appelée a renvoyer une erreur : Flag CARRY ?
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or byte ptr [bp+6],1b;Si oui on le retranscrit sur le registre FLAG qui sera dépilé lors du IRET
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;xor eax,eax
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;mov ax,cs ;On récupère le segment et l'offset puis en renvoie l'adresse physique
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;shl eax,4 ;de l'erreur.
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;add ax,cs:current
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jmp endofint ;on termine l'int
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noerror:
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and byte ptr [bp+6],0FEh;Si pas d'erreur on efface le Bit CARRY du FLAG qui sera dépilé lors du IRET
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endofint:
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pop bp
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sti ;On réactive les interruptions logiciellement
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iret ;Puis on retourne au programme appelant.
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current dw 0 ;Mot temporaire qui contient l'adresse de la fonction appelée
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tables dw readsector
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dw writesector
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dw verifysector2
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dw initdrive
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dw loadfile
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dw compressrle
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dw decompressrle
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dw FindFirstfile
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dw Findnextfile
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dw GetFreeSpace
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dw Searchfile
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dw Getname
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dw Getserial
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dw changedir
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dw readcluster
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dw writecluster
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dw getdir
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dw projfile
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dw execfile
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maxfunc equ 24
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;DPT disquette
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mydpt DPT ?
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;Secteur de boot
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myboot bootSector ?
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;Données Calculée
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clustersize dw 0
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TracksPerHead dw 0
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DriveSize dd 0
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AdressBoot dw 0
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AdressFat dw 0
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AdressParent dw 0
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AdressData dw 0
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AddingValue dw 0
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CurrentDir dw 0 ;En cluster
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CurrentDirStr db 128 dup (0)
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;Pour recherches
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EntryPlace dw 0 ;En octet
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AdressDirectory dw 0 ;En cluster
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firstsearch dw 1 ;Premiere requete ?
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getfat:
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push ax bx dx si
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mov ax,cx
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mov bx,ax
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and bx,0000000000000001b
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shr ax,1
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mov cx,3
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mul cx
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mov si,offset bufferfat
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add si,ax
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cmp bx,0h
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jnz evenfat
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oddfat:
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mov dx,cs:[si]
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and dx,0FFFh
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mov cx,dx
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jmp endfat
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evenfat:
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mov dx,cs:[si+1]
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and dx,0FFF0h
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shr dx,4
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mov cx,dx
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endfat:
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cmp dx,0FF0h
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jbe nocarry
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stc
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pop si dx bx ax
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ret
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nocarry:
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clc
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pop si dx bx ax
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ret
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;============loadfile (Fonction 4)===============
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;Charge le fichier ds:si en es:di ->ecx taille
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;-> AH=4
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;<- Flag Carry si erreur
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;=====================================================
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loadfile:
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push eax bx di
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push es di
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push cs
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pop es
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mov di,offset tempfit
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call searchfile
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pop di es
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jne errorload
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jc errorload
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mov cx,cs:tempfit.FileGroup
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mov eax,cs:tempfit.FileSize
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call loadway
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jc errorload
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clc
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mov ecx,eax
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pop di bx eax
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ret
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errorload:
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stc
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mov ecx,0
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pop di bx eax
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ret
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;============execfile (Fonction 18)===============
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;Execute le fichier ds:si
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;-> AH=18
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;<- Flag Carry si erreur
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;=====================================================
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execfile:
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pushad
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pushf
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push ds es fs gs
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call projfile
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jc reallyerror
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push cs
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mov ax,offset arrive
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push ax
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push es
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push 0100h
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push es
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push es
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push es
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pop ds
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pop fs
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pop gs
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push 7202h
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popf
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sti
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db 0CBh
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arrive:
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cli
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pop gs fs es ds
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popf
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popad
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ret
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reallyerror:
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pop gs fs es ds
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popf
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popad
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stc
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ret
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;============projfile (Fonction 17)===============
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;Charge le fichier ds:si sur un bloc mémoire -> ecx taille -> es bloc
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;-> AH=17
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;<- Flag Carry si erreur
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;=====================================================
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projfile:
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push eax bx di gs
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push cs
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pop es
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mov di,offset tempfit
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call searchfile
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jne errorload2
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jc errorload2
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mov eax,cs:tempfit.FileSize
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mov ecx,eax
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add ecx,19000
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push ax
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mov ah,2
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int 49h
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pop ax
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jc errorload2
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push gs
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pop es
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mov cx,cs:tempfit.FileGroup
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mov di,100h
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call loadway
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jc errorload2
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clc
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mov ecx,eax
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pop gs di bx eax
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ret
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errorload2:
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stc
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mov ecx,0
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pop gs di bx eax
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ret
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tempfit db 32 dup (0)
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;=============SearchFile (Fonction 10)===============
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;Renvois dans ES:DI la fit du fichier DS:SI et non equal si pas existant
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;-> AH=10
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;<- Flag Carry si erreur
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;=====================================================
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SearchFile:
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push ax cx ds si di es
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call uppercase
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push ds si
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call findfirstfilez
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push ds
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pop es
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mov di,si
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pop si ds
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jc errorsearch
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jmp founded
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nextsearch:
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push ds si
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call findnextfilez
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push ds
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pop es
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mov di,si
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pop si ds
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founded:
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cmp byte ptr cs:[di],0
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je notgood
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cmp byte ptr cs:[di+FileAttr],0Fh
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je nextsearch
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call cmpnames
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jc nextsearch
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okfound:
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push cs
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pop ds
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mov si,di
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pop es di
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push di es
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mov cx,32
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rep movsb
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clc
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pop es di si ds cx ax
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ret
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notgood:
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cmp si,0FF5h
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pop es di si ds cx ax
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ret
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errorsearch:
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stc
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pop es di si ds cx ax
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ret
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;Transforme la chaine ds:si en maj
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uppercase:
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push si ax
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mov di,si
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uppercaser:
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mov al,ds:[si]
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cmp al,0
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je enduppercase
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cmp al,'a'
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jb nonmaj
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cmp al,'z'
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ja nonmaj
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sub al,'a'-'A'
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mov ds:[si],al
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nonmaj:
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inc si
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jmp uppercaser
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enduppercase:
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clc
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pop ax si
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ret
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;Compare le nom ds:si '.' avec es:di
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CmpNames:
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push ax cx si di
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mov cx,8
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repe cmpsb
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jne nequal
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inc si
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nequal:
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cmp byte ptr [si-1],'.'
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jne trynoext
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mov al,' '
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rep scasb
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mov cx,3
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rep cmpsb
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jne notequal
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cmp byte ptr [si],0
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jne notequal
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cmp cx,0
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jl notequal
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itok:
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pop di si cx ax
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ret
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trynoext:
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cmp byte ptr [si-1],0
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jne notequal
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jmp itok
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notequal:
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stc
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pop di si cx ax
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ret
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;charge le fichier de de groupe CX et de taille eax
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LoadWay:
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push eax bx dx si di ecx ds es
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cmp eax,0
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je Zeroload
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rol eax,16
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mov dx,ax
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ror eax,16
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div cs:clusterSize
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mov bx,ax
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cmp bx,1
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jb adjustlast
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Loadfat:
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call readcluster
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jc noway
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add di,cs:clusterSize
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call getfat
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dec bx
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jnz loadfat
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AdjustLast:
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push es di
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push cs
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pop es
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mov di,offset bufferread
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mov si,di
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call Readcluster
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pop di es
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jc noway
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mov cx,dx
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push cs
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pop ds
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rep movsb
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zeroload:
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clc
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pop es ds ecx di si dx bx eax
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ret
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noway:
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stc
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pop es ds ebp di si dx bx eax
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ret
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;=============INITDRIVE (Fonction 04H)===============
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;Initialise le lecteur pour une utilisation ultérieure
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;-> AH=4
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;<- Flag Carry si erreur
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;=====================================================
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InitDrive:
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push eax bx cx edx di ds es
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push cs
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pop ds
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push cs
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pop es
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mov di,3
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againtry:
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xor ax,ax
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mov dx,0000h
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int 13h
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mov bx,offset myboot
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mov ax,0201h
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mov cx,0001h
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mov dx,0000h
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int 13h
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jnc oknoagaintry
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dec di
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jnz againtry
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oknoagaintry:
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mov cs:lastseg,0
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mov cs:lastoff,0
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mov cs:LastRead,0
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mov ax,myboot.sectorsize
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mov bl,myboot.SectorsPerCluster
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xor bh,bh
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mul bx
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mov clustersize,ax
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mov bx,myboot.HiddenSectorsL
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adc bx,myboot.HiddenSectorsH
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mov AdressBoot,bx
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add bx,myboot.ReservedSectors
|
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mov AdressFat,bx
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xor ax,ax
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mov al,myboot.FatsPerDrive
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mul myboot.SectorsPerFat
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add bx,ax
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mov AdressParent,bx
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mov AdressDirectory,bx
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mov ax,32
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mul myboot.DirectorySize
|
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div myboot.SectorSize
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add bx,ax
|
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mov AdressData,bx
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||
sub bx,2
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||
mov AddingValue,bx
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mov ax,myboot.SectorsPerDrive
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div myboot.SectorsPerTrack
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xor dx,dx
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div myboot.HeadsPerDrive
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mov TracksPerHead,ax
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xor eax,eax
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mov ax,myboot.SectorsPerDrive
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sub ax,AdressData
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mul myboot.SectorSize
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shl edx,16
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add edx,eax
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mov DriveSize,edx
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mov CurrentDir,0
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mov EntryPlace,0
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mov adressdirectory,0
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mov firstsearch,1
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mov currentdirstr,0
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mov di,offset bufferfat
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mov dx,myboot.SectorsPerFat
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mov cx,AdressFat
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SeeFat:
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call readsector
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jc ErrorInit
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add di,myboot.SectorSize
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inc cx
|
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dec dx
|
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jnz seefat
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clc
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pop es ds di edx cx bx eax
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ret
|
||
ErrorInit:
|
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stc
|
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pop es ds di edx cx bx eax
|
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ret
|
||
|
||
;=============FindFirstFile (Fonction 7)==============
|
||
;Renvois dans ES:DI un bloc d'info
|
||
;-> AH=7
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
FindFirstFile:
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push cx ds di si
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call FindFirstFileZ
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mov cx,32
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rep movsb
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pop si di ds cx
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ret
|
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|
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FindFirstFileZ:
|
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push cx
|
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mov cx,cs:CurrentDir
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mov cs:AdressDirectory,cx
|
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xor cx,cx
|
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mov cs:EntryPlace,cx
|
||
mov cs:firstsearch,1
|
||
call findnextfileZ
|
||
pop cx
|
||
ret
|
||
|
||
;=============FindnextFile (Fonction 8)==============
|
||
;Renvois dans ES:DI un bloc d'info
|
||
;-> AH=8
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
;Renvois dans ES:DI un bloc d'info
|
||
FindnextFile:
|
||
push cx ds di si
|
||
call FindnextFileZ
|
||
mov cx,32
|
||
rep movsb
|
||
pop si di ds cx
|
||
ret
|
||
|
||
;fait pointer ds:si sur la prochaine entrée du repertoire courant
|
||
FindnextFileZ:
|
||
push ax bx cx es di
|
||
push cs
|
||
pop ds
|
||
mov cx,cs:AdressDirectory
|
||
mov bx,cs:Entryplace
|
||
FindnextFileagain:
|
||
cmp cs:firstsearch,1
|
||
je first
|
||
add bx,32
|
||
cmp bx,cs:clusterSize
|
||
jb nopop
|
||
first:
|
||
mov di,offset bufferentry
|
||
push cs
|
||
pop es
|
||
mov bx,0
|
||
cmp cs:currentdir,0
|
||
jne notrootdir
|
||
cmp cs:firstsearch,1
|
||
je noaddfirst1
|
||
inc cx
|
||
noaddfirst1:
|
||
add cx,cs:adressparent
|
||
mov al,myboot.sectorspercluster
|
||
readroot:
|
||
call readsector
|
||
jc notwell
|
||
add di,myboot.sectorsize
|
||
dec al
|
||
jnz readroot
|
||
sub cx,cs:adressparent
|
||
jmp nopop
|
||
notrootdir:
|
||
cmp cs:firstsearch,1
|
||
je noaddfirst2
|
||
call getfat
|
||
noaddfirst2:
|
||
jc notwell
|
||
call readcluster
|
||
jc notwell
|
||
nopop:
|
||
mov cs:firstsearch,0
|
||
mov si,offset bufferentry
|
||
add si,bx
|
||
cmp byte ptr cs:[si],0
|
||
je notwell
|
||
mov cs:entryplace,bx
|
||
mov cs:AdressDirectory,cx
|
||
cmp byte ptr cs:[si],0E5h
|
||
je findnextfileagain
|
||
cmp byte ptr cs:[si+fileattr],28h
|
||
je findnextfileagain
|
||
cmp byte ptr cs:[si+fileattr],0Fh
|
||
je findnextfileagain
|
||
clc
|
||
pop di es cx bx ax
|
||
ret
|
||
notwell:
|
||
stc
|
||
pop di es cx bx ax
|
||
ret
|
||
|
||
;=============GetFreeSpace (Fonction 09H)===============
|
||
;Renvoie en EDX l'espace disque libre du volume
|
||
;-> AH=9
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
GetFreeSpace:
|
||
push eax
|
||
xor eax,eax
|
||
call getsector
|
||
mul cs:myboot.SectorSize
|
||
shl edx,16
|
||
add edx,eax
|
||
pop eax
|
||
ret
|
||
|
||
;ax=défectueux bx=libre
|
||
GetSector:
|
||
push cx dx
|
||
mov dx,cs:myboot.SectorsPerDrive
|
||
sub dx,cs:AddingValue
|
||
xor ax,ax
|
||
xor bx,bx
|
||
mov cx,0
|
||
goget:
|
||
push cx
|
||
call getfat
|
||
cmp cx,0FF7h
|
||
jne notdefect
|
||
inc bx
|
||
notdefect:
|
||
cmp cx,0
|
||
jne notfree
|
||
inc ax
|
||
notfree:
|
||
pop cx
|
||
inc cx
|
||
dec dx
|
||
jnz goget
|
||
pop dx cx
|
||
ret
|
||
errorfree:
|
||
stc
|
||
pop dx cx
|
||
ret
|
||
|
||
|
||
;=============READCLUSTER (Fonction 14)===============
|
||
;Lit le secteur CX et le met en es:di
|
||
;-> AH=14
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
readcluster:
|
||
push ax bx cx dx di
|
||
mov ax,cx
|
||
mov bl,cs:myboot.sectorspercluster
|
||
xor bh,bh
|
||
mul bx
|
||
mov cx,ax
|
||
add cx,cs:addingvalue
|
||
readsectors:
|
||
call readsector
|
||
jc errorreadincluster
|
||
add di,cs:myboot.sectorsize
|
||
inc cx
|
||
dec bl
|
||
jnz readsectors
|
||
clc
|
||
pop di dx cx bx ax
|
||
ret
|
||
errorreadincluster:
|
||
stc
|
||
pop di dx cx bx ax
|
||
ret
|
||
|
||
;=============WRITECLUSTER (Fonction 15)===============
|
||
;Ecrit le cluster CX et le met en es:di
|
||
;-> AH=14
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
writecluster:
|
||
push ax bx cx dx si
|
||
mov ax,cx
|
||
mov bl,cs:myboot.sectorspercluster
|
||
xor bh,bh
|
||
mul cx
|
||
mov cx,ax
|
||
add cx,cs:addingvalue
|
||
writesectors:
|
||
call writesector
|
||
jc errorwriteincluster
|
||
add si,cs:myboot.sectorsize
|
||
inc cx
|
||
dec bx
|
||
jnz writesectors
|
||
clc
|
||
pop si dx cx bx ax
|
||
ret
|
||
errorwriteincluster:
|
||
stc
|
||
pop si dx cx bx ax
|
||
ret
|
||
|
||
;=============READSECTOR (Fonction 01H)===============
|
||
;Lit le secteur CX et le met en es:di
|
||
;-> AH=1
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
ReadSector:
|
||
push ax bx cx dx si
|
||
cmp cx,cs:lastread
|
||
jne gom
|
||
mov ax,es
|
||
cmp cs:lastseg,ax
|
||
jne gom
|
||
cmp di,cs:lastoff
|
||
jne gom
|
||
jmp done
|
||
gom:
|
||
mov cs:lastseg,ax
|
||
mov cs:lastoff,di
|
||
mov cs:LastRead,cx
|
||
mov ax,cx
|
||
xor dx,dx
|
||
div cs:myboot.SectorsPerTrack
|
||
inc dl
|
||
mov bl,dl
|
||
xor dx,dx
|
||
div cs:myboot.HeadsPerDrive
|
||
mov dh,cs:myboot.bootdrive
|
||
xchg dl,dh
|
||
mov cx,ax
|
||
xchg cl,ch
|
||
shl cl,6
|
||
or cl,bl
|
||
mov bx,di
|
||
mov SI,4
|
||
mov AL,1
|
||
TryAgain:
|
||
mov AH, 2
|
||
int 13h
|
||
jnc Done
|
||
dec SI
|
||
jnz TryAgain
|
||
Done:
|
||
pop si dx cx bx ax
|
||
ret
|
||
|
||
lastread dw 0
|
||
lastseg dw 0
|
||
lastoff dw 0
|
||
|
||
;=============WRITESECTOR (Fonction 02H)==============
|
||
;Ecrit le secteur CX pointé par ds:si
|
||
;-> AH=2
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
WriteSector:
|
||
push ax bx cx dx si es
|
||
cmp cs:Lastread,cx
|
||
jne nodestruct
|
||
mov cs:Lastread,0ffffh
|
||
nodestruct:
|
||
push ds
|
||
pop es
|
||
mov ax,cx
|
||
xor dx,dx
|
||
div cs:myboot.SectorsPerTrack
|
||
inc dl
|
||
mov bl,dl
|
||
xor dx,dx
|
||
div cs:myboot.HeadsPerDrive
|
||
mov dh,cs:myboot.BootDrive
|
||
xchg dl,dh
|
||
mov cx,ax
|
||
xchg cl,ch
|
||
shl cl,6
|
||
or cl, bl
|
||
mov bx,si
|
||
mov SI, 4
|
||
mov AL,1
|
||
TryAgains:
|
||
mov AH, 3
|
||
int 13h
|
||
jnc Dones
|
||
dec SI
|
||
jnz TryAgains
|
||
Dones:
|
||
pop es si dx cx bx ax
|
||
ret
|
||
|
||
;=============Getname (Fonction 11)==============
|
||
;Renvoie le nom en ES:DI
|
||
;-> AH=11
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
getname:
|
||
push ax cx dx si di ds es
|
||
push cs
|
||
pop ds
|
||
mov dx,di
|
||
mov si,offset myboot.DriveName
|
||
mov cx,11
|
||
rep movsb
|
||
mov al,' '
|
||
mov di,dx
|
||
mov cx,11
|
||
repne scasb
|
||
mov byte ptr es:[di],0
|
||
pop es ds di si dx cx ax
|
||
ret
|
||
|
||
;=============Getserial (Fonction 12)==============
|
||
;Renvoie le numéro de serie en EDX
|
||
;-> AH=12
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
getserial:
|
||
mov edx,cs:myboot.serialnumber
|
||
ret
|
||
|
||
;=============VERIFYSECTOR (Fonction 03H)==============
|
||
;Vérifie le secteur CX
|
||
;-> AH=3
|
||
;<- Flag Carry si erreur, Flag Equal si secteurs égaux
|
||
;=====================================================
|
||
VerifySector:
|
||
push bx cx si di ds es
|
||
push cs
|
||
pop es
|
||
push cs
|
||
pop ds
|
||
mov bx,offset bufferread
|
||
call ReadSector
|
||
jc errorverify
|
||
call inverse
|
||
call WriteSector
|
||
jc errorverify
|
||
mov bx,offset bufferwrite
|
||
call ReadSector
|
||
call inverse
|
||
jc errorverify
|
||
mov bx,offset bufferread
|
||
call inverse
|
||
call WriteSector
|
||
jc errorverify
|
||
mov cx,cs:myboot.SectorSize
|
||
shr cx,2
|
||
mov si,offset bufferread
|
||
mov di,offset bufferwrite
|
||
cld
|
||
rep cmpsd
|
||
errorverify:
|
||
pop es ds di si cx bx
|
||
ret
|
||
|
||
Inverse:
|
||
mov si,cs:myboot.sectorsize
|
||
shr si,2
|
||
invert:
|
||
shl si,2
|
||
not dword ptr [bx+si-4]
|
||
shr si,2
|
||
dec si
|
||
jnz invert
|
||
ret
|
||
|
||
VerifySector2:
|
||
call verifysector
|
||
jne nook
|
||
or byte ptr [bp+6],10b
|
||
nook:
|
||
ret
|
||
|
||
;=============DecompressRle (Fonction 05H)==============
|
||
;decompress ds:si en es:di taille bp d‚compress‚ cx compress‚
|
||
;-> AH=5
|
||
;<- Flag Carry si erreur, Flag Equal si secteurs égaux
|
||
;=====================================================
|
||
DecompressRle:
|
||
push cx dx si di
|
||
mov dx,cx
|
||
mov bp,di
|
||
decompression:
|
||
mov eax,[si]
|
||
cmp al,'/'
|
||
jne nocomp
|
||
cmp si,07FFFh-6
|
||
jae thenen
|
||
mov ecx,eax
|
||
ror ecx,16
|
||
cmp cl,'*'
|
||
jne nocomp
|
||
cmp byte ptr [si+4],'/'
|
||
jne nocomp
|
||
mov al,ch
|
||
mov cl,ah
|
||
xor ah,ah
|
||
xor ch,ch
|
||
rep stosb
|
||
add si,5
|
||
sub dx,5
|
||
jnz decompression
|
||
jmp thenen
|
||
nocomp:
|
||
mov es:[di],al
|
||
inc si
|
||
inc di
|
||
dec dx
|
||
jnz decompression
|
||
thenen:
|
||
mov ax,dx
|
||
sub bp,di
|
||
neg bp
|
||
clc
|
||
pop di si dx cx
|
||
ret
|
||
|
||
;=============CompressRle (Fonction 06H)==============
|
||
;compress ds:si en es:di taille cx d‚compress‚ BP compress‚
|
||
;-> AH=6
|
||
;<- Flag Carry si erreur, Flag Equal si secteurs égaux
|
||
;=====================================================
|
||
CompressRle:
|
||
push ax bx cx dx si di ds es
|
||
mov bp,di
|
||
xchg si,di
|
||
push es
|
||
push ds
|
||
pop es
|
||
pop ds
|
||
mov dx,cx
|
||
;mov bp,cx
|
||
againcomp:
|
||
mov bx,di
|
||
mov al,es:[di]
|
||
mov cx,dx
|
||
cmp ch,0
|
||
je poo
|
||
mov cl,0ffh
|
||
;mov cx,bp
|
||
;sub cx,di
|
||
;mov ah,cl
|
||
poo:
|
||
mov ah,cl
|
||
inc di
|
||
xor ch,ch
|
||
repe scasb
|
||
sub cl,ah
|
||
neg cl
|
||
cmp cl,6
|
||
jbe nocomp2
|
||
mov dword ptr [si],' * /'
|
||
mov byte ptr [si+4],'/'
|
||
mov [si+1],cl
|
||
mov [si+3],al
|
||
add si,5
|
||
dec di
|
||
xor ch,ch
|
||
sub dx,cx
|
||
jnz againcomp
|
||
jmp fini
|
||
nocomp2:
|
||
mov [si],al
|
||
inc si
|
||
inc bx
|
||
mov di,bx
|
||
dec dx
|
||
jnz againcomp
|
||
fini:
|
||
sub bp,si
|
||
neg bp
|
||
clc
|
||
pop es ds di si dx cx bx ax
|
||
ret
|
||
|
||
;=============Changedir (Fonction 13)==============
|
||
;Change le repertoire courant a DS:SI
|
||
;-> AH=13
|
||
;<- Flag Carry si erreur, Flag Equal si secteurs égaux
|
||
;=====================================================
|
||
Changedir:
|
||
push ax cx dx si di ds es
|
||
push cs
|
||
pop es
|
||
;cmp [si],005Ch ;'\',0 (root dir)
|
||
mov di,offset tempdir
|
||
call searchfile
|
||
jc noch
|
||
mov cx,cs:tempdir.Filegroup
|
||
mov cs:CurrentDir,cx
|
||
mov cs:EntryPlace,0
|
||
mov cs:adressdirectory,cx
|
||
mov cs:firstsearch,1
|
||
cmp cs:[di],' ..'
|
||
jne notback
|
||
cmp cs:[di],' .'
|
||
je theend
|
||
mov di,offset currentdirstr
|
||
mov cx,128
|
||
mov al,0
|
||
repne scasb
|
||
mov al,'\'
|
||
std
|
||
repne scasb
|
||
cld
|
||
inc di
|
||
mov byte ptr es:[di],0
|
||
jmp theend
|
||
notback:
|
||
mov di,offset currentdirstr
|
||
mov cx,128
|
||
mov al,0
|
||
repne scasb
|
||
dec di
|
||
mov al,'\'
|
||
stosb
|
||
mov dx,di
|
||
push ds
|
||
pop es
|
||
mov di,si
|
||
mov cx,128
|
||
mov al,0
|
||
repne scasb
|
||
sub cx,128
|
||
neg cx
|
||
push cs
|
||
pop es
|
||
mov di,dx
|
||
rep movsb
|
||
theend:
|
||
pop es ds di si dx cx ax
|
||
clc
|
||
ret
|
||
noch:
|
||
pop es ds di si dx cx ax
|
||
stc
|
||
ret
|
||
|
||
tempdir db 32 dup (0)
|
||
|
||
;=============getdir (Fonction 16)==============
|
||
;Recupere le repertoire courant a ES:DI
|
||
;-> AH=16
|
||
;<- Flag Carry si erreur
|
||
;=====================================================
|
||
getdir:
|
||
push ax cx si di ds es
|
||
push es di
|
||
push cs
|
||
pop es
|
||
mov di,offset currentdirstr
|
||
mov cx,128
|
||
mov al,0
|
||
repne scasb
|
||
sub cx,128
|
||
neg cx
|
||
pop di es
|
||
push cs
|
||
pop ds
|
||
mov si,offset currentdirstr
|
||
rep movsb
|
||
pop es ds di si cx ax
|
||
clc
|
||
ret
|
||
|
||
|
||
bufferread equ $
|
||
bufferwrite equ $+2048
|
||
bufferentry equ $+2048+2048
|
||
bufferFat equ $+2048+2048+2048
|
||
|
||
end start
|