Foro de elhacker.net

#include<iostream>
#include<stdlib.h>


#include "ZerroArray.h"
using namespace std;

int main ()
{
	int count =1024;
	char *arr=new char [count];

	for (int i = 0; i < count; i++)
	{
		arr[i]=(char)rand();
	}
	for (int j = 0; j < count; j++)
	{
		cout<<(int)arr[j]<<" ";
	}

	ZerroArray(arr, count*sizeof(char));

	for (int k = 0; k < count; k++)
	{
		cout<<(int) arr [k]<<" " ;
	}

	cin.get();
	delete[] arr;
	return 0;
}

#ifndef ZERROARRAY_H
#define ZERROARRAY_H
extern "C" void ZerroArray(void *arr, int countInBytes);


#endif

.code
ZerroArray proc 
	cmp edx, 0
	jle Finished

	cmp edx, 1
	je SetFinalByte

	mov ax, 0
	mov r8d, edx
	shr edx,1

MainLoop:
	mov word ptr [rcx], ax
	add rcx,2
	dec edx
	jnz MainLoop

	and r8d,1
	jz Finished

SetFinalByte:
	mov byte prt [rcx],0

Finished:
	ret
ZerroArray endp
end