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FASTFILE.ASM
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Assembly Source File
|
1990-09-26
|
23KB
|
461 lines
; _______________________________________________________________
; | |
; | Copyright (C) 1989,1990 Steven Lutrov |
; |_______________________________________________________________|____
; | | |
; | Program Title : Fastfile.Asm | | ___
; | Author : Steven Lutrov | | |
; | Revision : 2.01 | | |
; | Date : 1990-03-16 | | |
; | Language : Turbo Assembler | | |
; | | | |
; | | | |
; | Description : Assembly functions For primitive file | | |
; | : handeling. | | |
; | : Tested on Turbo Pascal Turbo Pascal 5.5 | | |
; | | | |
; |_______________________________________________________________| | |
; | | |
; |________________________________________________________________| |
; | |
; |_________________________________________________________________|
;
Code Segment Word Public
Assume Cs:Code,Ds:Data
Public Closefile,Createfile,Erasefile,Fmovepointer,Openfile,Readfile,
Public Writefile,Getverify,Getvolume,Readsector,Setverify,Setvolume
Public Writesector
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Function Getverify: Boolean;
;
;
Getverify Proc Far
Mov Ah,54H ;Dos Func To Get Verify
Int 21H ;Get Status
Ret
Getverify Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Function Getvolume(Disk: Integer; Workarea: Pointer): Stype;
;
;
Getvolume Proc Far
Push Bp ;Save Turbos Bp
Mov Bp,Sp ;
Push Ds ;Save Turbo'S Ds
Mov Ah,2Fh ;Save Current Dta
Int 21H ;
Push Es ;
Push Bx ;
Cld ;Set Direction Flag
Lds Dx,Dword Ptr[Bp+6] ;Ds:Dx Pts To Workarea
Mov Ah,1Ah ;Function To Set Dta
Int 21H ;Set Dta
Mov Si,Dx ;Point Si To Dta
Mov Al,[Bp+10] ;Get Drive Specifier
Or Al,Al ;0 = Current Drive
Jnz Getv1 ;Jump If Not Current
Mov Ah,19H ;Dos Func To Get Drv Num
Int 21H ;Get Current Drive
Inc Al ;Count Drives From 1
Getv1: Add Al,64 ;Convert To A:, B: Etc.
Mov [Si],Al ;Write It
Inc Si ;Forward Ptr
Mov Al,':' ;Colour To Follow Drv Spec
Mov [Si],Al ;Write It
Inc Si ;Forward Ptr
Mov Al,'*' ;Global Character
Mov [Si],Al ;Write It
Inc Si ;Forward Ptr
Mov Al,'.' ;Global Character
Mov [Si],Al ;Write It
Inc Si ;Forward Ptr
Mov Al,'*' ;Global Character
Mov [Si],Al ;Write It
Inc Si ;Forward Ptr
Mov Al,0 ;Terminate With 0
Mov [Si],Al ;Write It
Mov Cx,8 ;Attribute For Vol Label
Les Di,Dword Ptr[Bp+12] ;Point To Return String
Mov Ah,4Eh ;Function To Seek File
Int 21H ;Seek Vol Label
Jnc Getv2 ;Jump If Found
Mov Byte Ptr Es:[Di],0 ;Set Null String Descriptor
Jmp Getv5 ;Go Quit
Getv2: Inc Di ;Forward Pointer To First Char
Mov Si,Dx ;Si To Start Of Workarea
Add Si,30 ;Offset To Vol Label
Sub Cl,Cl ;Count Strx Len In Cl
Getv3: Lodsb ;Get A Byte
Or Al,Al ;Test For Terminating 0
Jz Getv4 ;Jump When Finished
Cmp Al,'.' ;Period?
Je Getv3 ;Skip It If So
Stosb ;Transfer Char
Inc Cl ;Inc Length Counter
Jmp Short Getv3 ;Go Get Next
Getv4: Les Di,Dword Ptr[Bp+12] ;Return String Address
Mov Es:[Di],Cl ;Set Descriptor
Getv5: Pop Dx ;Restore Prior Dta
Pop Ds ;
Mov Ah,1Ah ;
Int 21H ;
Pop Ds ;
Pop Bp
Ret 6
Getvolume Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Procedure Readsector(Segment,Offset,Drive,Sector,Number: Word);
;
;
Data Segment
Extrn Errreturn:Byte
Data Ends
;
;
Readsector Proc Far
Push Bp ;Save Bp
Mov Bp,Sp ;Set Up Stack Frame
Push Ds ;Save Ds
Lds Bx,Dword Ptr[Bp+12] ;Get Buffer Address
Mov Al,[Bp+10] ;Drive Code
Dec Al ;Adjust For Turbo
Mov Dx,[Bp+8] ;Logical Sector Number
Mov Cx,[Bp+6] ;Number Sectors To Read
Int 25H ;Read The Sector(S)
Mov Bl,0 ;0 = No Error
Jnc Rsec1 ;Test For Error
Mov Bl,Ah ;Error Code To Bl
Rsec1: Pop Cx ;Balance Stack
Pop Ds ;Restore Ds
Pop Bp ;Restore Bp
Mov Errreturn,Bl ;Set Error Code
Ret 10
Readsector Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Procedure Setverify(Setting: Boolean);
;
;
Setverify Proc Far
Mov Bx,Sp ;
Sub Dl,Dl ;Dl Must = 0
Mov Al,Ss:[Bx+4] ;1 = On, 0 = Off
Mov Ah,2Eh ;Dos Func To Set Verify
Int 21H ;Set Verification
Ret 2
Setverify Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Procedure Setvolume(Disk: Integer; Newlabel: Stype; Workarea: Pointer);
;
;
Setvolume Proc Far
Push Bp ;
Mov Bp,Sp ;
Push Ds ;
Mov Ah,2Fh ;Save Current Dta
Int 21H ;Dos Interrupt
Push Es ;
Push Bx ;
Lds Dx,Dword Ptr[Bp+6] ;Ds:Dx Pts To Workarea
Mov Ah,1Ah ;Function To Set Dta
Int 21H ;Set Dta
Setv1: Les Di,Dword Ptr[Bp+6] ;Es:Di Pts To Workarea
Lds Si,Dword Ptr[Bp+6] ;Ds:Dx Pts To Workarea
Mov Ax,2020H ;Clear With Spaces
Mov Cx,22 ;22 Words In Workarea
Cld ;Direction Forward
Rep Stosw ;Clear The Workarea
Mov Byte Ptr[Si],0Ffh ;Ff Marks Extended Fcb
Add Si,6 ;Forward To Attri Byte
Mov Byte Ptr[Si],8 ;Volume Label Attribute
Inc Si ;Forward Ptr
Mov Al,[Bp+14] ;Drive Number
Mov [Si],Al ;Set It
Mov Bx,Si ;
Inc Bx ;
Les Di,Dword Ptr[Bp+10] ;Es:Di Pts To New Label
Sub Cx,Cx ;Clear Cx
Mov Cl,Es:[Di] ;Length Of New Label
Jcxz Sevol3 ;Jump If Null
Cmp Cx,13 ;In Range?
Ja Sevol4 ;Quit If Not
Sevol2: Inc Si ;Forward Target Ptr
Inc Di ;
Mov Al,Es:[Di] ;Get A Byte
Mov [Si],Al ;Transfer To Workarea
Loop Sevol2 ;Go Do Next
Mov Ah,16H ;"Create File"
Int 21H ;Go Set Label
Cmp Al,0Ffh ;Test For Error
Jne Sevol4 ;Quit If None
Sevol3: Mov Ax,Ds ;Point Es:Di Back To Label Field
Mov Es,Ax ;
Mov Di,Bx ;
Mov Al,'?' ;Write Global Chars
Mov Cx,13 ;13 Chars
Rep Stosb ;Write Them
Mov Ah,13H ;Func To Delete Label
Int 21H ;Get Rid Of Old Label
Cmp Al,0Ffh ;Test For Error
Je Sevol4 ;Get Out If Error
Mov Si,Bx ;Pt Back To Label Field
Mov Di,Bx ;Di Too
Jmp Short Setv1 ;Go Set Up Label Again
Sevol4: Pop Dx ;Restore Prior Dta
Pop Ds ;
Mov Ah,1Ah ;
Int 21H ;
Pop Ds ;
Pop Bp ;
Ret 10
Setvolume Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Procedure Writesector(Segment,Offset,Drive,Sector,Number: Word;);
;
;
Data Segment
Extrn Errreturn:Byte
Data Ends
;
;
Writesector Proc Far
Push Bp ;Save Bp
Mov Bp,Sp ;Set Up Stack Frame
Push Ds ;Save Ds
Lds Bx,Dword Ptr[Bp+12] ;Get Buffer Address
Mov Al,[Bp+10] ;Drive Code
Dec Al ;Adjust For Turbo
Mov Dx,[Bp+8] ;Logical Sector Number
Mov Cx,[Bp+6] ;Number Sectors To Write
Int 26H ;Write The Sector(S)
Mov Bl,0 ;0 = No Error
Jnc Wsec1 ;Test For Error
Mov Bl,Ah ;Error Code To Bl
Wsec1: Pop Cx ;Balance Stack
Pop Ds ;Restore Ds
Pop Bp ;Restore Bp
Mov Errreturn,Bl ;Set Error Code
Ret 10 ;
Writesector Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Function Createfile(Fname:String; Attribute:Integer):Integer;
Fcname Equ Dword Ptr [Bp+8]
Fcattr Equ Word Ptr [Bp+6]
Fcsize Equ 4 + 2
Createfile Proc Far
Push Bp ; Save Bp
Mov Bp,Sp ; Setup Stack Frame
Push Ds ; Save Ds
Lds Si,Fcname ; Get Fcname Address
Mov Bl,[Si] ; Get Length Of String In Dx
Inc Si ; Skip Pascal String[0] Length Byte
Xor Bh,Bh ; Bx=$00Xx, Where Xx Is Length
Mov [Si+Bx],Bh ; End String With Asciz
Mov Dx,Si ; Fname Asciz Ptr In Ds:Dx
Mov Cx,Fcattr ; Attribute To Set In Created File
Mov Ah,3Ch ; Create
Int 21H ; Do It
Jnc Fc01 ; Jump If No Error
Neg Ax ; Ax:=-Ax
Fc01: Pop Ds ;
Pop Bp ;
Ret Fcsize
Createfile Endp
;-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Function Openfile(Name:String; Access:Integer):Integer;
Foname Equ Dword Ptr [Bp+8]
Foacce Equ Word Ptr [Bp+6]
Fosize Equ 4 + 2
Openfile Proc Far
Push Bp ; Save Bp
Mov Bp,Sp ; Set Up Stack Frame
Push Ds ; Save Ds
Lds Si,Foname ; Get Foname Address
Mov Bl,[Si] ; Get Length Of String In Dx
Inc Si ; Skip Pascal String[0] Length Byte
Xor Bh,Bh ; Bx=$00Xx, Where Xx Is Length
Mov [Si+Bx],Bh ; End String With Asciz
Mov Dx,Si ; Fname Asciz Ptr In Ds:Dx
Mov Ax,Foacce ; File Access Code
Mov Ah,3Dh ; Open File
Int 21H ; Do It
Mov Bx,0 ; Boolean False
Jnc Fo01 ; Jump If No Error
Neg Ax ; Ax:=-Ax;
Fo01: Pop Ds ; Restore Ds
Pop Bp ; Restore Bp
Ret Fosize
Openfile Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Function Closefile(Handle:Integer):Boolean;
Fclhandle Equ Word Ptr [Bp+6]
Fclsize Equ 2
Closefile Proc Far
Push Bp ; Save Bp Stack
Mov Bp,Sp ; Set Up Stack Frame
Mov Bx,Fclhandle ; File Handler Identifier
Mov Ah,3Eh ; Close
Int 21H ; Do It
Mov Ax,0 ; Boolean False
Jc Fcl01 ; Jump If Error
Mov Ax,1 ; Boolean True
Fcl01: Pop Bp
Ret Fclsize
Closefile Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Function Writefile(Handle:Integer; Nwrite:Word; Var Buff):Integer;
Fwhandle Equ Word Ptr [Bp+12]
Fwwrite Equ Word Ptr [Bp+10]
Fwbuff Equ Dword Ptr [Bp+6]
Fwsize Equ 2 + 2 + 4
Writefile Proc Far
Push Bp ; Save Bp Stack
Mov Bp,Sp ; Set Up Stack Frame
Push Ds ; Save Ds
Mov Bx,Fwhandle ; File Handler Identifier
Lds Dx,Fwbuff ; Data Buffer
Mov Cx,Fwwrite ; Number Of Bytes To Write
Cmp Cx,07Fffh ; Above 7Fff
Ja Fw02 ; To Many Bytes To Write
Mov Ah,40H ; Write
Int 21H ; Do It
Jnc Fw01 ; Jump If No Error
Fw02: Neg Ax ; Ax:=-Ax;
Fw01: Pop Ds ; Restore Bs
Pop Bp ; Restore Bp
Ret Fwsize
Writefile Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Function Readfile(Handle:Word; Amount:Word; Var Buff):Integer;
Frhandle Equ Word Ptr [Bp+12]
Framount Equ Word Ptr [Bp+10]
Frbuff Equ Dword Ptr [Bp+6]
Frsize Equ 2 + 2 + 4
Readfile Proc Far
Push Bp ; Store Bp
Mov Bp,Sp ; Setup Stack Frame
Push Ds ; Save Ds
Mov Bx,Frhandle ; File Handler Identifier
Lds Dx,Frbuff ; Data Buffer
Mov Cx,Framount ; Number Of Bytes To Read
Cmp Cx,07Fffh ; Above 7Fff
Ja Fr02 ; Too Many Bytes To Read
Mov Ah,3Fh ; Read
Int 21H ; Do It
Jnc Fr01 ; Jump If No Error
Fr02: Neg Ax ; Make Ax Negative
Fr01: Pop Ds ; Restore Ds
Pop Bp ; Restore Bp
Ret Frsize
Readfile Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Function Fmovepointer(Handle:Integer; Mode:Integer; Offset:Longint;
; Var Location:Longint):Boolean;
Fshandle Equ Word Ptr [Bp+16]
Fsmode Equ Word Ptr [Bp+14]
Fsofshi Equ Word Ptr [Bp+12]
Fsofslo Equ Word Ptr [Bp+10]
Fslocation Equ Dword Ptr [Bp+6]
Fssize Equ 2 + 2 + 4 + 4
Fmovepointer Proc Far
Push Bp ; Save Bp
Mov Bp,Sp ; Set Up Stack Frame
Push Ds ; Save Ds
Mov Bx,Fshandle ; File Handler Identifier
Mov Cx,Fsofshi ; File Offset In Cx
Mov Dx,Fsofslo ; File Offset In Cx:Dx
Mov Ax,Fsmode ; Load Method Code
Mov Ah,42H ; Seek
Int 21H ; Do It
Mov Bx,1 ; Boolean True
Jnc Fs01 ; Jump If Not Error
Mov Bx,0 ; Boolean False
Mov Dx,0 ; High Word In Location=$0000
Fs01: Les Di,Fslocation ; Point To Fslocation
Cld ; Set Direction Flag
Stosw ; Low Word To Location
Mov Ax,Dx ;
Stosw ; High Word To Location
Mov Ax,Bx ; Return False Or True
Pop Ds ; Restore Ds
Pop Bp ; Restore Bp
Ret Fssize
Fmovepointer Endp
;=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
;Function Erasefile(Name:String):Integer;
Fename Equ Dword Ptr [Bp+6]
Fesize Equ 4
Erasefile Proc Far
Push Bp ; Save Bp
Mov Bp,Sp ; Set Up Stack Frame
Push Ds ; Save Ds
Lds Si,Fename ; Get Address Of Fename
Mov Bl,[Si] ; Get Length Of String In Dx
Inc Si ; Skip Pascal String[0] Length Byte
Xor Bh,Bh ; Bx=$00Xx, Where Xx Is Length
Mov [Si+Bx],Bh ; End String With Asciz
Mov Dx,Si ; Fname Asciz Ptr In Ds:Dx
Mov Ah,41H ; Erase File
Int 21H ; Do It
Mov Bx,0 ; Boolean False
Jnc Fe01 ; Jump If No Error
Neg Ax ; Make Ax -Ax;
Jmp Fe02 ; Restore And Exit
Fe01: Mov Ax,0 ;
Fe02: Pop Ds ; Restore Ds
Pop Bp ; Restore Bp
Ret Fesize
Erasefile Endp
Code Ends
End
