/// <summary>
/// Add a new section to the PE file.
/// </summary>
/// <param name="name">Name of the section to add. At max. 8 characters.</param>
/// <param name="size">Size in bytes of the new section.</param>
/// <param name="characteristics">Section characteristics.</param>
public void AddSection(string name, int size, ScnCharacteristicsType characteristics)
{
if (ImageNtHeaders is null)
{
throw new Exception("IMAGE_NT_HEADERS must not be null.");
}
if (ImageDosHeader is null)
{
throw new Exception("IMAGE_DOS_HEADER must not be null");
}
uint getNewSizeOfImage()
{
var factor = size / (double)ImageNtHeaders.OptionalHeader.SectionAlignment;
var additionalSize = (uint)Math.Ceiling(factor) * ImageNtHeaders !.OptionalHeader.SectionAlignment;
return(ImageNtHeaders.OptionalHeader.SizeOfImage + additionalSize);
}
uint getNewSecHeaderOffset()
{
var sizeOfSection = 0x28;
var x = (uint)ImageNtHeaders !.FileHeader.SizeOfOptionalHeader + 0x18;
var startOfSectionHeader = ImageDosHeader.E_lfanew + x;
return((uint)(startOfSectionHeader + (ImageNtHeaders.FileHeader.NumberOfSections * sizeOfSection)));
}
uint getNewSecVA()
{
var lastSec = ImageSectionHeaders.OrderByDescending(sh => sh.VirtualAddress).First();
var vaLastSecEnd = lastSec.VirtualAddress + lastSec.VirtualSize;
var factor = vaLastSecEnd / (double)ImageNtHeaders.OptionalHeader.SectionAlignment;
return((uint)(Math.Ceiling(factor) * ImageNtHeaders.OptionalHeader.SectionAlignment));
}
// Append new section to end of file
var paNewSec = RawFile.AppendBytes(new Byte[size]);
// Add new entry in section table
var newSection = new ImageSectionHeader(RawFile, getNewSecHeaderOffset(), ImageNtHeaders.OptionalHeader.ImageBase)
{
Name = name,
VirtualSize = (uint)size,
VirtualAddress = getNewSecVA(),
SizeOfRawData = (uint)size,
PointerToRawData = (uint)paNewSec,
PointerToRelocations = 0,
PointerToLinenumbers = 0,
NumberOfRelocations = 0,
NumberOfLinenumbers = 0,
Characteristics = characteristics
};
// Increase number of sections
ImageNtHeaders.FileHeader.NumberOfSections = (ushort)(ImageNtHeaders.FileHeader.NumberOfSections + 1);
// Adjust image size by image alignment
ImageNtHeaders.OptionalHeader.SizeOfImage = getNewSizeOfImage();
// Reparse section headers
_nativeStructureParsers.ReparseSectionHeaders();
}
