int2f.asm

一个磁盘文件被删除后恢复的源程序！ 内嵌汇编代码~！

;****************************************************************************
; INT2F-MSCDEX (Windows CDFS) CD-ROM support VxD
; Version: 1.0
; Copyright (C) 2001 Alexander & Christian Grau,  All Rights Reserved
;****************************************************************************
        .386p

;******************************************************************************
;                             I N C L U D E S
;******************************************************************************

  DEBUG equ 1

        .XLIST
        INCLUDE VMM.Inc
        INCLUDE Debug.Inc
        INCLUDE v86mmgr.inc
	include vwin32.inc
	include shell.inc
        .LIST


;******************************************************************************
;              V I R T U A L   D E V I C E   D E C L A R A T I O N
;******************************************************************************

Declare_Virtual_Device INT2F, \
        INT2F_MAJOR_VERSION,  \
        INT2F_MINOR_VERSION,  \
        INT2F_Control, ,      \
	UNDEFINED_INIT_ORDER


;******************************************************************************
;                                E Q U A T E S
;******************************************************************************

  INT2F_MAJOR_VERSION EQU 1
  INT2F_MINOR_VERSION EQU 0


  DIOC_ISCDROMDRIVE      EQU 1
  DIOC_READSECTOR        EQU 2


  INT2F_ERROR_SUCCESS       EQU 0
  INT2F_ERROR_NOSUCHSERVICE EQU 1
  INT2F_ERROR_FAILED        EQU 2
  INT2F_ERROR_OUTOFMEMORY   EQU 3


  CARRY_FLAG EQU 1


;******************************************************************************
;                             S T R U C T U R E S
;******************************************************************************

  cdstruc struc
    cd_Drv           db ?
    cd_LBA           dd ?
    cd_Blocks        db ?
    cd_Buf           dd ?
  cdstruc ends



;******************************************************************************
;                                D A T A
;******************************************************************************

VxD_IDATA_SEG
;       Initialization data here - discarded after Init_Complete
VxD_IDATA_ENDS


VxD_DATA_SEG
;       Normal Data here
VxD_DATA_ENDS


VxD_LOCKED_DATA_SEG
;       Pagelocked data here - try to keep this to a minimum.

  ioctlerror     dd 0
  AllocLenBuf    dd ?


VxD_LOCKED_DATA_ENDS



;******************************************************************************
;                  I N I T I A L I Z A T I O N   C O D E
;------------------------------------------------------------------------------
;    Code in the initialization segment is discarded after Init_Complete
;******************************************************************************

VxD_ICODE_SEG

;******************************************************************************
;
;   INT2F_Device_Init
;
;   DESCRIPTION:
;       This is a shell for a routine that is called at system BOOT.
;       Typically, a VxD would do its initialization in this routine.
;
;   ENTRY:
;       EBX = System VM handle
;
;   EXIT:
;       Carry clear to indicate load success
;       Carry set to abort loading this VxD
;
;   USES:
;       flags
;
;==============================================================================
VxdCaption	db	"VxD Extensions",0
VxdMessage	db	"         Loading...",0

BeginProc INT2F_Device_Init

        Trace_Out "INT2F_Device_Init"
  ifdef debugmsg
	; Put up message box indicating we're loading
	VMMcall	Get_Cur_VM_Handle
	mov	eax, MB_OK
	mov	ecx, OFFSET32 VxdMessage
	mov	edi, OFFSET32 VxdCaption
	VxDcall	SHELL_SYSMODAL_Message
  endif

        clc                             ;no error - load VxD
        ret

EndProc INT2F_Device_Init

VxD_ICODE_ENDS



;******************************************************************************
;                               C O D E
;------------------------------------------------------------------------------
; The 'body' of the VxD would typically be in the standard code segment.
;******************************************************************************

VxD_CODE_SEG



VxD_CODE_ENDS



;******************************************************************************
;                      P A G E   L O C K E D   C O D E
;------------------------------------------------------------------------------
;       Memory is a scarce resource. Use this only where necessary.
;******************************************************************************
VxD_LOCKED_CODE_SEG



;******************************************************************************
;
;   INT2F_Control
;
;   DESCRIPTION:
;       This is a call-back routine to handle the messages that are sent
;
;   ENTRY:
;       EAX = Message number
;       EBX = VM Handle
;
;==============================================================================

public INT2F_control
BeginProc INT2F_Control
        Control_Dispatch SYS_DYNAMIC_DEVICE_INIT,      INT2F_Device_Init
        Control_Dispatch SYS_DYNAMIC_DEVICE_EXIT,      INT2F_Device_Exit
	Control_Dispatch W32_DEVICEIOCONTROL,          INT2F_ioctl
        clc
        ret
EndProc INT2F_Control



;******************************************************************************
;
; INT2F_ioctl - Respond to DeviceIOcontrol messages sent by Win32 program.
;
; Entry: esi -> DIOC block
; DIOCParams	STRUC
;               Internal1	DD	?
;               VMHandle	DD	?
;               Internal2	DD	?
;               dwIoControlCode	DD	?    ; 0=IsCDRomDrive
;               lpvInBuffer	DD	?
;               cbInBuffer	DD	?
;               lpvOutBuffer	DD	?    
;               cbOutBuffer	DD	?
;               lpcbBytesReturned	DD
;               lpoOverlapped	DD	?
;               hDevice	DD	?
;               tagProcess	DD	?
; DIOCParams	ENDS
;
; Exit:
;
;******************************************************************************


BeginProc INT2F_ioctl

        Debug_Out "Debug_Out!!"
        Trace_Out "INT2F_ioctl..."
        mov     ioctlerror, INT2F_ERROR_NOSUCHSERVICE
	mov	ecx,[esi].dwIoControlCode	; get ioctl code

        cmp     ecx, DIOC_OPEN                  ; DIOC_OPEN is sent when VxD is loaded w/ CreateFile
        je      ioctl_open
        cmp     ecx, DIOC_CLOSEHANDLE           ; DIOC_CLOSEHANDLE is sent when VxD is unloaded w/ CloseHandle
        je      ioctl_close
        cmp     ecx, DIOC_ISCDROMDRIVE
        je      ioctl_iscdrom
        cmp     ecx, DIOC_READSECTOR