public static byte[] DecryptFileTable(IPackStream stream, System.IO.Stream buffer)
{
if (stream.CompressedDataSize > 0 && stream.EncodedDataSize > 0 && stream.DataSize > 0)
{
byte[] src = new byte[stream.EncodedDataSize];
if ((ulong)buffer.Read(src, 0, (int)stream.EncodedDataSize) == stream.EncodedDataSize)
{
return(Decrypt(stream.Version, (uint)stream.EncodedDataSize,
(uint)stream.CompressedDataSize, Encryption.Aes | Encryption.Zlib, src));
}
}
throw new Exception("ERROR decrypting file table: the size of the table is invalid.");
}
private static List <PackFileEntry> ReadFile(Stream headerFile)
{
using var headerReader = new BinaryReader(headerFile);
var stream = IPackStream.CreateStream(headerReader);
string fileString =
Encoding.UTF8.GetString(CryptoManager.DecryptFileString(stream, headerReader.BaseStream));
stream.FileList.AddRange(PackFileEntry.CreateFileList(fileString));
stream.FileList.Sort();
// Load the file allocation table and assign each file header to the entry within the list
byte[] fileTable = CryptoManager.DecryptFileTable(stream, headerReader.BaseStream);
using var tableStream = new MemoryStream(fileTable);
using var reader = new BinaryReader(tableStream);
stream.InitFileList(reader);
return(stream.FileList);
}
public M2dReader(string path)
{
m2dFile = MemoryMappedFile.CreateFromFile(path);
// Create an index from the header file
using var headerReader = new BinaryReader(System.IO.File.OpenRead(path.Replace(".m2d", ".m2h")));
var stream = IPackStream.CreateStream(headerReader);
string fileString =
Encoding.UTF8.GetString(CryptoManager.DecryptFileString(stream, headerReader.BaseStream));
stream.FileList.AddRange(PackFileEntry.CreateFileList(fileString));
stream.FileList.Sort();
// Load the file allocation table and assign each file header to the entry within the list
byte[] fileTable = CryptoManager.DecryptFileTable(stream, headerReader.BaseStream);
using var tableStream = new MemoryStream(fileTable);
using var reader = new BinaryReader(tableStream);
stream.InitFileList(reader);
Files = stream.FileList;
}