PE文件RV转FOA及FOA转RVA

/************************************************************************/
/*
功能:虚拟内存相对地址和文件偏移的转换
参数：stRVA：    虚拟内存相对偏移地址
lpFileBuf: 文件起始地址
返回：转换后的文件偏移地址
*/
/************************************************************************/
size_t RVAToOffset(size_t stRVA, PVOID lpFileBuf)
{PIMAGE_DOS_HEADER pDos = (PIMAGE_DOS_HEADER)lpFileBuf;size_t stPEHeadAddr = (size_t)lpFileBuf + pDos->e_lfanew;PIMAGE_NT_HEADERS32 pNT = (PIMAGE_NT_HEADERS32)stPEHeadAddr;//区段数DWORD dwSectionCount = pNT->FileHeader.NumberOfSections;//内存对齐大小DWORD dwMemoruAil = pNT->OptionalHeader.SectionAlignment;PIMAGE_SECTION_HEADER pSection = IMAGE_FIRST_SECTION(pNT);//距离命中节的起始虚拟地址的偏移值。DWORD  dwDiffer = 0;for (DWORD i = 0; i < dwSectionCount; i++){//模拟内存对齐机制DWORD dwBlockCount = pSection[i].SizeOfRawData / dwMemoruAil;dwBlockCount += pSection[i].SizeOfRawData%dwMemoruAil ? 1 : 0;DWORD dwBeginVA = pSection[i].VirtualAddress;DWORD dwEndVA = pSection[i].VirtualAddress + dwBlockCount * dwMemoruAil;//如果stRVA在某个区段中if (stRVA >= dwBeginVA && stRVA < dwEndVA){dwDiffer = stRVA - dwBeginVA;return pSection[i].PointerToRawData + dwDiffer;}else if (stRVA < dwBeginVA)//在文件头中直接返回
        {return stRVA;}}return 0;
}

/************************************************************************/
/*
功能：文件偏移地址和虚拟地址的转换
参数：stOffset：文件偏移地址
lpFileBuf:虚拟内存起始地址
返回：转换后的虚拟地址
*/
/************************************************************************/
size_t Offset2VA(size_t stOffset, PVOID lpFileBuf)
{//获取DOS头PIMAGE_DOS_HEADER pDos = (PIMAGE_DOS_HEADER)lpFileBuf;//获取PE头//e_lfanew:PE头相对于文件的偏移地址size_t stPEHeadAddr = (size_t)lpFileBuf + pDos->e_lfanew;PIMAGE_NT_HEADERS32 pNT = (PIMAGE_NT_HEADERS32)stPEHeadAddr;//区段数DWORD dwSectionCount = pNT->FileHeader.NumberOfSections;//映像地址DWORD dwImageBase = pNT->OptionalHeader.ImageBase;//区段头PIMAGE_SECTION_HEADER pSection = IMAGE_FIRST_SECTION(pNT);//相对大小DWORD  dwDiffer = 0;for (DWORD i = 0; i < dwSectionCount; i++){//区段的起始地址和结束地址DWORD dwBeginVA = pSection[i].PointerToRawData;DWORD dwEndVA = pSection[i].PointerToRawData + pSection[i].SizeOfRawData;//如果文件偏移地址在dwBeginVA和dwEndVA之间if (stOffset >= dwBeginVA && stOffset < dwEndVA){//相对大小dwDiffer = stOffset - dwBeginVA;//进程的起始地址 + 区段的相对地址 + 相对区段的大小return dwImageBase + pSection[i].VirtualAddress + dwDiffer;}else if (stOffset < dwBeginVA)    //如果文件偏移地址不在区段中
        {return dwImageBase + stOffset;}}return 0;
}