static unsafe void Inject(InjectOptions options)
{
var elf = File.ReadAllBytes(options.File);
var scanner = new DatScanner(elf);
var files = scanner.FindFiles(options.Dat);
var jsonFile = JsonDatFile.FromFile(options.JsonPath);
using var memoryStream = new MemoryStream(elf, true);
using var streamReader = new BufferedStreamReader(memoryStream, 2048);
using var extendedMemoryStream = new ExtendedMemoryStream(elf, true);
// Patch all table entries.
foreach (var offset in files.Keys)
{
Console.WriteLine($"Patching table at: {offset:X}, RAM: {scanner.RawToMemoryAddress(offset):X}");
// Go to 2nd entry and get initial file name write pointer.
streamReader.Seek(offset, SeekOrigin.Begin);
streamReader.Read(out DatFileEntry firstEntry);
// Get file name write pointer.
streamReader.Peek(out DatFileEntry secondEntry);
int fileNameWritePointer = scanner.MemoryToRawAddress(secondEntry.NamePtr);
// Write archive entry
var newFirstEntry = new DatFileEntry(firstEntry.NamePtr, jsonFile.Files[0].Offset / DatFileEntry.SECTOR_SIZE_BYTES, jsonFile.Files[0].SizeBytes);
extendedMemoryStream.Seek(offset, SeekOrigin.Begin);
extendedMemoryStream.Write(newFirstEntry);
// Now write each file in order, while keeping track of the pointer.
foreach (var entry in jsonFile.Files)
{
// Make entry for the file.
var datEntry = new DatFileEntry(scanner.RawToMemoryAddress(fileNameWritePointer), entry.Offset / DatFileEntry.SECTOR_SIZE_BYTES, entry.SizeBytes);
extendedMemoryStream.Write(datEntry);
// Get bytes attached to the name (w/ Null Terminator).
var alignedTextLength = Utilities.Utilities.RoundUp(entry.Name.Length + 1, 8); // Alignment of 8
var nameBytes = new byte[alignedTextLength];
Encoding.ASCII.GetBytes(entry.Name, nameBytes);
// Write bytes to pointer.
Array.Copy(nameBytes, 0, elf, fileNameWritePointer, nameBytes.Length);
// Align text to next predetermined value like in original ELF.
fileNameWritePointer += alignedTextLength;
}
}
// Write new executable to file.
memoryStream.Dispose();
streamReader.Dispose();
extendedMemoryStream.Dispose();
Console.WriteLine($"Writing patched file to: {options.File}");
File.WriteAllBytes(options.File, elf);
}
