在笔者上篇文章《驱动开发：内核扫描SSDT挂钩状态》中简单介绍了如何扫描被挂钩的SSDT函数，并简单介绍了如何解析导出表，本章将继续延申PE导出表的解析，实现一系列灵活的解析如通过传入函数名解析出函数的RVA偏移，ID索引，Index下标等参数，并将其封装为可直接使用的函数，以在后期需要时可以被直接引用，同样为了节约篇幅本章中的LoadKernelFile()内存映射函数如需要使用请去前一篇文章中自行摘取。

首先实现GetRvaFromModuleName()函数，当用户传入参数后自动将函数名解析为对应的RVA偏移或Index下标索引值，该函数接收三个参数传递，分别是wzFileName模块名，FunctionName所在模块内的函数名，Flag标志参数，函数输出ULONG64类型的数据。

// 署名权
// right to sign one's name on a piece of work
// PowerBy: LyShark
// Email: me@lyshark.com

// 从指定模块中得到特定函数的RVA或相对序号相对偏移
ULONG64 GetRvaFromModuleName(WCHAR *wzFileName, UCHAR *FunctionName, INT Flag)
{
	// 加载内核模块
	PVOID BaseAddress = LoadKernelFile(wzFileName);

	// 取出导出表
	PIMAGE_DOS_HEADER pDosHeader;
	PIMAGE_NT_HEADERS pNtHeaders;
	PIMAGE_SECTION_HEADER pSectionHeader;
	ULONGLONG FileOffset;
	PIMAGE_EXPORT_DIRECTORY pExportDirectory;

	// DLL内存数据转成DOS头结构
	pDosHeader = (PIMAGE_DOS_HEADER)BaseAddress;

	// 取出PE头结构
	pNtHeaders = (PIMAGE_NT_HEADERS)((ULONGLONG)BaseAddress + pDosHeader->e_lfanew);

	// 判断PE头导出表是否为空
	if (pNtHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress == 0)
	{
		return 0;
	}

	// 取出导出表偏移
	FileOffset = pNtHeaders->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;

	// 取出节头结构
	pSectionHeader = (PIMAGE_SECTION_HEADER)((ULONGLONG)pNtHeaders + sizeof(IMAGE_NT_HEADERS));
	PIMAGE_SECTION_HEADER pOldSectionHeader = pSectionHeader;

	// 遍历节结构进行地址运算
	for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
	{
		if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
		{
			FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
		}
	}

	// 导出表地址
	pExportDirectory = (PIMAGE_EXPORT_DIRECTORY)((ULONGLONG)BaseAddress + FileOffset);

	// 取出导出表函数地址
	PULONG AddressOfFunctions;
	FileOffset = pExportDirectory->AddressOfFunctions;

	// 遍历节结构进行地址运算
	pSectionHeader = pOldSectionHeader;
	for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
	{
		if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
		{
			FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
		}
	}
	AddressOfFunctions = (PULONG)((ULONGLONG)BaseAddress + FileOffset);

	// 取出导出表函数名字
	PUSHORT AddressOfNameOrdinals;
	FileOffset = pExportDirectory->AddressOfNameOrdinals;

	// 遍历节结构进行地址运算
	pSectionHeader = pOldSectionHeader;
	for (UINT16 Index = 0; Index < pNtHeaders->FileHeader.NumberOfSections; Index++, pSectionHeader++)
	{
		if (pSectionHeader->VirtualAddress <= FileOffset && FileOffset <= pSectionHeader->VirtualAddress + pSectionHeader->SizeOfRawData)
		{
			FileOffset = FileOffset - pSectionHeader->VirtualAddress + pSectionHeader->PointerToRawData;
		}
	}
	AddressOfNameOrdinals = (PUSHORT)((ULONGLONG)BaseAddress + FileOffset);

	// 取出导出表函数序号
	PULONG AddressOfNames;
	FileOffset = pExportDirectory->AddressOf