Funny PE Header Processing

//http://waleedassar.blogspot.com
//http://www.twitter.com/waleedassar
//N.B the following is total crap!!!!!!!!

//p is a pointer to PE header and fileSize is PE file size.
int i=0;
bool found=false;
while(i+3 < fileSize)
{
    if(p[i]=='P' && p[i+1]=='E' && p[i+2]==0 && p[i+3]==0)
    {     found=true;  break; }
    i++;
}
if(found)
{
//The real NT_FILE_HEADER is assumed to have been found here.
//continue processing PE file
}
else
{
    //file is rejected
}