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扩大节思路
扩大节步骤:

注意:扩大节最好在最后节扩展 不然要修改好多东西
一:扩大节
  1、拉伸到内存
  2、分配一块新的空间:SizeOfImage+Ex
  3、将最后一个节的SizeOfRawData 和 VirtualSize改成NSizeOfRawData = VirtualSize = NN = (SizeOfRawData或者Virtualsize 内存对齐后的值)+Ex
  4、修改sizeofimage大小Sizeofimage= sizeofimage+Ex
扩大节代码实现
[C++] 纯文本查看 复制代码
VOID ExpansionSection(){    PVOID pFileBuffer = NULL;    PVOID pImageBuffer = NULL;    PVOID pNewBuffer = NULL;    PVOID pNewImageBuffer = NULL;​    PIMAGE_DOS_HEADER pDosHeader = NULL;    PIMAGE_FILE_HEADER pPEHeader = NULL;    PIMAGE_OPTIONAL_HEADER32 pOptionHeader = NULL;    PIMAGE_SECTION_HEADER pSectionHeader = NULL;    PIMAGE_SECTION_HEADER pSectionHeaderUP = NULL;    PBYTE codeBegin = NULL;    BOOL isOk = FALSE;    DWORD size = 0;​    ReadPEFile(file_path, &pFileBuffer);    if (!pFileBuffer)    {        printf("文件->缓冲区失败");        return;    }    /*FileBuffer->ImageBuffer*/    CopyFileBufferToImageBuffer(pFileBuffer, &pImageBuffer);    if (!pImageBuffer)    {        printf(" 复制文件到缓冲区失败");        free(pFileBuffer);        return;    }    pDosHeader = (PIMAGE_DOS_HEADER)pImageBuffer;    pPEHeader = (PIMAGE_FILE_HEADER)((DWORD)((DWORD)pImageBuffer + pDosHeader->e_lfanew) + 4);    pOptionHeader = (PIMAGE_OPTIONAL_HEADER32)(((DWORD)pImageBuffer + pDosHeader->e_lfanew) + 4 + IMAGE_SIZEOF_FILE_HEADER);    pSectionHeader = (PIMAGE_SECTION_HEADER)(((DWORD)pImageBuffer + pDosHeader->e_lfanew) + 4 + IMAGE_SIZEOF_FILE_HEADER + pPEHeader->SizeOfOptionalHeader);​    pOptionHeader->SizeOfImage += 0x1000;    pSectionHeader[pPEHeader->NumberOfSections - 1].Misc.VirtualSize += 0x1000;    pSectionHeader[pPEHeader->NumberOfSections - 1].SizeOfRawData += 0x1000;    size = CopyImageBufferToNewFileBuffer(pImageBuffer, &pNewBuffer);​    if (size == 0 || !pNewBuffer)    {        printf("存盘失败");        free(pFileBuffer);        free(pImageBuffer);        free(pNewBuffer);        return;    }​    isOk = MemoryToFile(pNewBuffer, size, write_file_path);    printf("MemoryToFile");    if (isOk)    {        printf("存盘成功");        return;    }    free(pFileBuffer);    free(pImageBuffer);    free(pNewBuffer);        return;}

合并节思路
合并节是将多个节合并;例如所有节合并为一个节:  
   1】只保留一个节表;  
   2】所有的节当作一个节,将描述信息写在第一个节表中;
意义:
合并节后,原来节表的地方空出来了,可以方便插入新节;
有多个节时,拉伸时需要循环遍历各个节表做对齐之类的操作;合并节     表后减少了这些操作;
  影响:
如果把所有节合并,那么节与节之间就不再考虑内存对齐或者文件对齐了,由于我们是在文件装载到内存后合并的节,如果内存对齐和文件对齐不一样,那么最后将合并后的文件再还原成硬盘上的状态时,所有的节会当成一个整体,不会再文件对齐了,所以就导致了合并后文件可能会变大
步骤:     
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,即用第一个节的属性与其他的节的属性做运算   
4)修改节的数量为1
合并节代码实现
[C++] 纯文本查看 复制代码
VOID MergeSection(){    PIMAGE_DOS_HEADER pDos = NULL;    PIMAGE_FILE_HEADER pFile = NULL;    PIMAGE_NT_HEADERS32 pNt = NULL;    PIMAGE_OPTIONAL_HEADER pOpt = NULL;    PIMAGE_SECTION_HEADER pSec = NULL;&#8203;    PVOID pFileBuffer = NULL;    PVOID pImageBuffer = NULL;    PVOID pNewBuffer = NULL;    BOOL isOk = FALSE;    DWORD size = 0;    ReadPEFile(file_path,&pFileBuffer);    if (!pFileBuffer)    {        printf("读取文件失败");        return;    }    CopyFileBufferToImageBuffer(pFileBuffer, &pImageBuffer);    if (!pImageBuffer)    {        printf("复制文件到imagebuffer失败");        free(pFileBuffer);        return;    }    pDos = (PIMAGE_DOS_HEADER)pImageBuffer;    pNt = (PIMAGE_NT_HEADERS32)((DWORD)pDos + pDos->e_lfanew);    pFile = (PIMAGE_FILE_HEADER)((DWORD)pNt + 4);    pOpt = (PIMAGE_OPTIONAL_HEADER)((DWORD)pFile + IMAGE_SIZEOF_FILE_HEADER);    pSec = (PIMAGE_SECTION_HEADER)((DWORD)pOpt + pFile->SizeOfOptionalHeader);&#8203;    //修改节的属性    DWORD dwMax = pSec[pFile->NumberOfSections - 1].Misc.VirtualSize > pSec[pFile->NumberOfSections - 1].SizeOfRawData ? pSec[pFile->NumberOfSections - 1].Misc.VirtualSize : pSec[pFile->NumberOfSections - 1].SizeOfRawData;    pSec->Misc.VirtualSize = pSec->SizeOfRawData = pSec[pFile->NumberOfSections - 1].VirtualAddress + dwMax - pOpt->SizeOfHeaders;    for (size_t i = 1; i < pFile->NumberOfSections; i++)    {        pSec->Characteristics |= pSec[i].Characteristics;    }    memset(pSec + 1, 0, IMAGE_SIZEOF_SECTION_HEADER * (pFile->NumberOfSections - 1));    pFile->NumberOfSections = 1;    //TO  NewBuffer    size = CopyImageBufferToNewFileBuffer(pImageBuffer, &pNewBuffer);    if (size == 0 || !pNewBuffer)    {        printf("存盘失败");        free(pFileBuffer);        free(pImageBuffer);        free(pNewBuffer);        return;    }    isOk = MemoryToFile(pNewBuffer, size, write_file_path);    if (isOk)    {        printf("存盘成功");        return;    }    free(pFileBuffer);    free(pImageBuffer);    free(pNewBuffer);    return;}
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扩大节-合并节

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