error,i need help debugging it. small code
when i calling CHECKDCFAKER and get an error, im loading a file in some dynamic memory and preforming a crc32 check on it, i dont know where the error is please help.
Code:
.386
.model flat, stdcall
option casemap :none
Include c:\asm\masm32\Include\windows.inc
Include c:\asm\masm32\Include\user32.inc
Include c:\asm\masm32\Include\kernel32.inc
Include c:\asm\masm32\Include\GDI32.inc
Include c:\asm\masm32\Include\SHELL32.inc
IncludeLib c:\asm\masm32\lib\SHELL32.lib
IncludeLib c:\asm\masm32\lib\GDI32.lib
IncludeLib c:\asm\masm32\lib\user32.lib
IncludeLib c:\asm\masm32\lib\kernel32.lib
szText macro Name, Text:VARARG
Local lbl
jmp lbl
Name db Text,0
lbl:
endm
m2m macro M1, M2
push M2
pop M1
endm
return macro arg
mov eax, arg
ret
endm
Crc32 PROTO :DWORD, :DWORD
InitCrc32Tbl PROTO
CHECKDCFAKER PROTO :DWORD
.Data?
crctab dd ?
hFile HANDLE ? ; File handle
hMemory HANDLE ? ;handle to the allocated memory block
pMemory DWORD ? ;pointer to the allocated memory block
SizeReadWrite DWORD ? ; number of bytes actually read or write
.Data
buf_P db "C:\asm\first\Qages\Qages.exe",0
.Const
IDM_OPEN Equ 1
IDM_SAVE Equ 2
IDM_EXIT Equ 3
MAXSIZE Equ 260
MEMSIZE Equ 65535
.Code
LIBMAIN Proc px:DWORD, py:DWORD, pz:DWORD
return TRUE
ret
LIBMAIN EndP
;*-------------------------------------------*
; void InitCRC(void);
; Precomputes a 256*4 CRC array for use with
; Crc32()
;*-------------------------------------------*
InitCrc32Tbl Proc Uses esi edi ebx
lea edi,crctab + (255*4)
xor edx,edx
dec dl
std
CalcTblValues:
mov eax,edx
mov ebx,0edb88320h ; winzip polynominal
push 8 ;mov ecx,8
pop ecx
ReflectBitsCompute_Loop:
shr eax,1
sbb esi,esi
and esi,ebx
xor eax,esi
dec ecx
jz ReflectBitsCompute_Loop
stosd
dec edx
jns CalcTblValues
cld
ret
InitCrc32Tbl EndP
;*-------------------------------------------*
; int FastCRC(*buffer, sizeof(buffer);
; Calculates a 32 Bit Cyclic Redundancy Code
; over a buffer with length sizeof(buffer),
; using a precomputed CRC table. InitCRC()
; must be called *once* before.
; Speed: ~7 MB/s on a Intel PII 300
;*-------------------------------------------*
Crc32 Proc Uses esi edi lpData:DWORD,bLen:DWORD
mov esi,lpData
lea edi,crctab
mov ecx,bLen
xor eax,eax
dec eax
xor edx,edx
@@:
mov dl,byte ptr [esi]
inc esi
xor dl,al
shr eax,8
xor eax,dword ptr [edi+(edx*4)]
dec ecx
jnz @B
not eax
ret
Crc32 EndP
CHECKDCFAKER Proc pDAT:DWORD
Local pCRCD :DWORD
Invoke CreateFile,Addr buf_P,GENERIC_READ or GENERIC_WRITE ,FILE_SHARE_READ or FILE_SHARE_WRITE,\
NULL,OPEN_EXISTING,FILE_ATTRIBUTE_ARCHIVE,\
NULL
mov hFile,eax
Invoke GlobalAlloc,GMEM_MOVEABLE or GMEM_ZEROINIT,MEMSIZE
mov hMemory,eax
Invoke GlobalLock,hMemory
mov pMemory,eax
Invoke ReadFile,hFile,pMemory,MEMSIZE-1,Addr SizeReadWrite,NULL
Invoke InitCrc32Tbl ;int crc
Invoke Crc32,Addr pMemory,Addr SizeReadWrite ;call it
mov DWORD PTR [pDAT] ,eax
Invoke CloseHandle,hFile
Invoke GlobalUnlock,pMemory
Invoke GlobalFree,hMemory
ret
CHECKDCFAKER EndP
End LIBMAIN
