📄 htodw.asm
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.code
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htodw proc uses edx esi pString:LPSTR
option PROLOGUE:none
option EPILOGUE:none
; pHexString equ [esp + 0Ch]
push esi
push edx
mov esi, [esp + 0Ch] ; pHexString
xor edx, edx
ALIGN 4
htodw_loop:
mov al, [esi]
inc esi
sub al, "0"
js htodw_endloop
shl edx, 4
cmp al, 9
jbe @F
sub al, "a" - "0" - 10
jns @F
add al, 20h
@@:
xor dl, al
jmp htodw_loop
htodw_endloop:
mov eax, edx
pop edx
pop esi
ret sizeof DWORD
option PROLOGUE:PROLOGUEDEF
option EPILOGUE:EPILOGUEDEF
htodw endp
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