求教C这段语言代码作用

DWORD dwMagic;
DWORD i;
BYTE dwCode;
DWORD dwAddr;

dwStartMap = SH->VirtualAddress + (DWORD)MapOfFile;//段现在首地址
dwEndMap  = SH->Misc.VirtualSize + dwStartMap;//段现在末地址
i = 0;
for (dwMagic=1; dwMagic <0xFF; dwMagic++)
{
if (i == dwEndMap)
    break ;
for (i=dwStartMap; i <dwEndMap; i++)
    {
dwCode = *(LPBYTE)i;
if (dwCode == 0xE8 || dwCode == 0xE9)//call或jmp
{
    dwAddr = i + 5 + *(LPDWORD)(i+1);//跳转的目的地址
    if (dwAddr>dwStartMap && dwAddr <dwEndMap)
continue ; //段内转移
    dwCode = *(LPBYTE)(i+1);//段间转移，*(LPBYTE)(i+1)是偏移量的低字节吧，保存到dwCode有什么用？什么逻辑？
    if (dwCode == dwMagic)
break ;  //为什么这样做，偏移量的低字节为循环的dwMagic的概率很小啊，而且比较类型也不一致
}
      }
}//这个两层for完了，没有做任何操作，唯有dwAddr保存了最后个call或jmp的跳转地址，dwCode恰好是dwMagic的值-可能性很小

---

DWORD dwMagic;
DWORD i;
BYTE dwCode;
DWORD dwAddr;
dwStartMap = SH->VirtualAddress + (DWORD)MapOfFile;//段现在首地址
dwEndMap  = SH->Misc.VirtualSize + dwStartMap;//段现在末地址
i = 0;
for (dwMagic=1; dwMagic <0xFF; dwMagic++)
{
if (i == dwEndMap)
break ;