PE 合并节

前言：这将近半年准备大二专升本考试，在前几天终于考完了，不管好还是坏，等下个月初出成绩吧，自己现在就开始先复习知识点先

2021.5.20 反馈下 湖州学院-计科

先开始复习的是PE，在PE的学习中忘记了写PE的合并节，所以这里重新写下

void MerageSection(PVOID pFileBuffer,PDWORD OldBufferSize,PVOID* pNewBuffer){
	
	PIMAGE_DOS_HEADER pImageDosHeader = NULL;
	PIMAGE_FILE_HEADER pImageFileHeader = NULL;
	PIMAGE_OPTIONAL_HEADER32 pImageOptionalHeader = NULL;
	PIMAGE_SECTION_HEADER pImageSectionHeaderGroup = NULL;
	PIMAGE_SECTION_HEADER NewSec = NULL;

	DWORD dwSectionAlignmentSizeOfHeaders = 0;
	DWORD dwMaxSizeOfRawDataOrVirtualSize = 0;
	int i = 0;

	*pNewBuffer = (PVOID)malloc(*OldBufferSize);
	memset(*pNewBuffer, *OldBufferSize, 0);
	memcpy(*pNewBuffer, pFileBuffer, *OldBufferSize);

	pImageDosHeader = (PIMAGE_DOS_HEADER)*pNewBuffer;
	pImageFileHeader = (PIMAGE_FILE_HEADER)((DWORD)pImageDosHeader + pImageDosHeader->e_lfanew + 4);
	pImageOptionalHeader = (PIMAGE_OPTIONAL_HEADER32)((DWORD)pImageFileHeader + sizeof(IMAGE_FILE_HEADER));
	pImageSectionHeaderGroup = (PIMAGE_SECTION_HEADER)((DWORD)pImageOptionalHeader + pImageFileHeader->SizeOfOptionalHeader);

	/*	
		1、拉伸到内存						

		2、将第一个节的内存大小、文件大小改成一样						

		Max = SizeOfRawData>VirtualSize?SizeOfRawData:VirtualSize						

		SizeOfRawData = VirtualSize = 最后一个节的VirtualAddress + Max - SizeOfHeaders内存对齐后的大小						

		3、将第一个节的属性改为包含所有节的属性						

		4、修改节的数量为1						
	*/

	dwSectionAlignmentSizeOfHeaders = ((pImageOptionalHeader->SizeOfHeaders%pImageOptionalHeader->SectionAlignment)+1)*pImageOptionalHeader->SectionAlignment;

	dwMaxSizeOfRawDataOrVirtualSize = pImageSectionHeaderGroup[pImageFileHeader->NumberOfSections-1].SizeOfRawData
		> pImageSectionHeaderGroup[pImageFileHeader->NumberOfSections-1].Misc.VirtualSize
		? pImageSectionHeaderGroup[pImageFileHeader->NumberOfSections-1].SizeOfRawData
		: pImageSectionHeaderGroup[pImageFileHeader->NumberOfSections-1].Misc.VirtualSize;

	printf("%x\n", dwMaxSizeOfRawDataOrVirtualSize);
	
	printf("%x\n", pImageSectionHeaderGroup[pImageFileHeader->NumberOfSections-1].VirtualAddress 
		+ dwMaxSizeOfRawDataOrVirtualSize - dwSectionAlignmentSizeOfHeaders);

	pImageSectionHeaderGroup[0].SizeOfRawData = pImageSectionHeaderGroup[pImageFileHeader->NumberOfSections-1].VirtualAddress 
		+ dwMaxSizeOfRawDataOrVirtualSize - dwSectionAlignmentSizeOfHeaders;

	pImageSectionHeaderGroup[0].Misc.VirtualSize = pImageSectionHeaderGroup[pImageFileHeader->NumberOfSections-1].VirtualAddress
		+ dwMaxSizeOfRawDataOrVirtualSize - dwSectionAlignmentSizeOfHeaders;

	for(i=1;i<pImageFileHeader->NumberOfSections;i++){
		pImageSectionHeaderGroup[0].Characteristics |= pImageSectionHeaderGroup[i].Characteristics;
	}

	pImageFileHeader->NumberOfSections = 1;

}