view byte by byte through OutputDebugString

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sleepsleep

Joined: 05 Oct 2006
Posts: 11271
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sleepsleep 20 May 2007, 23:58

hi there,
while doing this smart card dll, i face one problem
let me describe my problem.

eg.

Code:

somevariable db 0x00, 0xA4, 0x04, 0x00, 0x0A, 0x0A0, 0x00, 0x00, 0x00, 0x74, 0x4A, 0x50, 0x4E, 0x00, 0x10

now, assume i need to view it through OutputDebugString (return exactly like 0x00 0xA4 0x00 0x0A .... ~

first idea i got is like
f1 db '%lX ',0
f2 db '%s',0
mov eax,somevariable
xor edx,edx
mov edx, byte [eax]
invoke wsprintf,buff,f1,edx
mov esi,buff2
invoke lstrlen,buff
add esi,eax
invoke wsprintf,esi,f2,buff

u guys got any idea?

20 May 2007, 23:58

sleepsleep 21 May 2007, 01:21

just coded this (seems workable on my side)
could read the smartcard response now (match with string) through debugger (more easier now)
if first byte is zero, it returns immediately, u can check it with eax, if u supply sz, it will loop until that byte, if u supply zero, it loop until it finds 0 byte.

Code:

buff2                            rb 0xFF
debug                                rb 0xFF
debugr                               dd ?
debugw                          dd ?
debugs                          dd ?

proc debug_mem addr, sz
; -- -------------------
             push    debug
               pop     [debugw]
            push    [addr]
              pop     [debugr]
            cmp     [sz],0
              je      .till_null
          push    [sz]
                pop     [debugs]
    
    .s1:
            xor     edx,edx
             mov     eax,[debugr]
                mov     dl,byte [eax]
       cinvoke wsprintf,buff2,f2,edx
       cinvoke wsprintf,[debugw],f3,buff2
  invoke  lstrlen,buff2
               add     [debugw],eax
                inc     [debugr]
            dec     [debugs]
            cmp     [debugs],0
          je      .exit
               jmp     .s1
 
    .till_null:
             mov     eax,[addr]
          cmp     byte [eax],0
                je      .first_null
         mov     [debugs],1
          inc     eax
         
            .s2:
                    cmp     byte [eax],0
                        je      .s1
                 inc     eax
                 inc     [debugs]
                    jmp     .s2
         
            .first_null:
                    mov     eax,0
                       ret
 
    .exit:
          mov     eax,debug
           ret
endp

21 May 2007, 01:21

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