根据PE文件信息获得文件大小

//根据PE文件信息，计算各块大小和
ULONG  GetFileLen(LPVOID pBaseaddr,LPVOID pReadBuf)
{
        LPBYTE pBase=(LPBYTE)pBaseaddr;
        PIMAGE_DOS_HEADER pDosHeader=(PIMAGE_DOS_HEADER)pReadBuf;
        ULONG uSize=PIMAGE_OPTIONAL_HEADER((pBase+pDosHeader->e_lfanew+4+20))->SizeOfHeaders;
        PIMAGE_SECTION_HEADER    pSec = (PIMAGE_SECTION_HEADER)(pBase+pDosHeader->e_lfanew + sizeof(IMAGE_NT_HEADERS));
        for(int i=0;i<PIMAGE_FILE_HEADER(pBase+pDosHeader->e_lfanew+4)->NumberOfSections;++i)
        {
            uSize+=pSec[i].SizeOfRawData;
        }
        return uSize;
}