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|
;/**********************************************************************/
;/** Microsoft Windows/NT **/
;/** Copyright(c) Microsoft Corp., 1994 **/
;/**********************************************************************/
;/*
; cvxdFile.asm
;
; Contains simple VXD File I/O routines (that use VxdInt 21h macro)
; for dhcp.bin support
;
; FILE HISTORY:
; madana 07-May-1994 Created
; koti 10-Oct-1994 Copied over/modified for vnbt
;
;*/
.386p
include vmm.inc
include v86mmgr.inc
include dosmgr.inc
include opttest.inc
include netvxd.inc
include debug.inc
include pageable.inc
EXTRN _fInInit:DWORD
EXTRN _GetInDosFlag:NEAR
;****************************************************************************
;** PushState Macro
;
; Saves the client state.
;
PushState MACRO
push edi
push esi
push ebx
mov ecx, 0
VMMCall Begin_Critical_Section
ENDM
;****************************************************************************
;** PopState Macro
;
; Restores client state.
;
PopState MACRO
VMMCall End_Critical_Section
pop ebx
pop esi
pop edi
ENDM
NBT_PAGEABLE_CODE_SEG
;****************************************************************************
;** _VxdFileOpen
;
; Opens a file
;
; Entry: [ESP+4] - Pointer to full path of file, path must be flat
; pointer.
;
; Exit: EAX will contain a handle to the openned file
;
BeginProc _VxdFileOpen
PushState ; This pushes lots of crap
mov edx, [esp+16] ; move flat pointer file name
mov eax, 3d02h ; Open file, read/write, share
VxDInt 21h
jc VFO_6 ; Carry set if error
jmp VFO_10 ; successful file open, eax has file handle
VFO_6:
; Debug_Out "VxdFileOpen failed, error #EAX"
mov eax, 0 ; Failed to open the file
VFO_10:
PopState
ret
EndProc _VxdFileOpen
;****************************************************************************
;** _VxdFileRead
;
; Reads x bytes from a previously openned file
;
; Entry: [ESP+4] - Handle from _VxdFileOpen
; [ESP+8] - Count of bytes to read
; [ESP+12]- flat pointer to destination buffer
;
; Exit: EAX will contain the number of bytes read, 0 if EOF or
; an error occurred.
;
BeginProc _VxdFileRead
PushState ; Pushes lots of crap
mov ebx, [esp+16] ; File Handle
mov ecx, [esp+20] ; Bytes to read
mov edx, [esp+24] ; flat buffer pointer
mov eax, 3f00h
VxDInt 21h
jc VFR_6 ; Carry set if error
jmp VFR_7 ; successful file open, eax has bytes read
VFR_6:
; Debug_Out "VxdFileRead failed"
mov eax, 0 ; Failed to read the file
VFR_7:
PopState
ret
EndProc _VxdFileRead
;****************************************************************************
;** _VxdFileClose
;
; Closes a file openned with VxdOpenFile
;
; Entry: [ESP+4] - Handle from _VxdFileOpen
;
BeginProc _VxdFileClose
PushState ; Pushes lots of crap
mov ebx, [esp+16] ; File Handle
mov eax, 3e00h
VxDInt 21h
jc VFCL_6 ; Carry set if error
jmp VFCL_7 ; successful set.
VFCL_6:
Debug_Out "VxdFileClose - Read failed"
mov eax, 0 ; Failed to close the file
VFCL_7:
PopState
ret
EndProc _VxdFileClose
;****************************************************************************
;** _VxdWindowsPath
;
; Gets a pointer to (null-terminated) path to the windows directory
;
; This is an Init time only routine
;
; Entry: nothing
;
; Exit: pointer to path to windows directory
;
BeginProc _VxdWindowsPath
PushState ; Pushes lots of crap
VmmCall Get_Config_Directory
mov eax, edx ; path is returned in edx
PopState ; now pop all that crap
ret
EndProc _VxdWindowsPath
NBT_PAGEABLE_CODE_ENDS
END
|
