public void Decompress(Stream input, Stream output)
{
using (var zstandardStream = new ZstandardStream(input, CompressionMode.Decompress))
{
zstandardStream.CopyTo(output);
}
}
private int getSizeOfLastBlock()
{
if (lastBlockSize > -1)
{
return(lastBlockSize);
}
switch (compressionAlgorithm[amountOfBlocks - 1])
{
case 0:
var rawBS = (int)compressedBlocks[amountOfBlocks - 1].GetSize();
return(rawBS); //DON'T return bs here as the last block will be smaller!
case 1:
using (var decompressionStream = new ZstandardStream(compressedBlocks[amountOfBlocks - 1].AsStream(), CompressionMode.Decompress))
using (var memoryStream = new MemoryStream())
{
decompressionStream.CopyTo(memoryStream);
return((int)memoryStream.Length);
}
default:
throw new NotImplementedException(
"The specified compression algorithm isn't implemented yet!");
}
}
/// <inheritdoc/>
protected override void BaseDecompress(Stream inputStream, Stream outputStream)
{
using var gZipStream = new ZstandardStream(inputStream, CompressionMode.Decompress, true);
gZipStream.CopyTo(outputStream);
outputStream.Flush();
gZipStream.Flush();
}
public static byte[] Decompress(byte[] data, int decompressedSize)
{
using (var memoryStream = new MemoryStream(data))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var temp = new MemoryStream())
{
compressionStream.CopyTo(temp);
return(temp.ToArray());
}
}
private byte[] Decompress(byte[] compressed)
{
using (var inputStream = new MemoryStream(compressed))
using (var zstandardStream = new ZstandardStream(inputStream, CompressionMode.Decompress))
using (var outputStream = new MemoryStream())
{
zstandardStream.CopyTo(outputStream);
return(outputStream.ToArray());
}
}
/// <summary>
/// decompresses given zstd compressed data
/// </summary>
/// <param name="compressed"></param>
/// <returns></returns>
public static byte[] DecompressZstd(byte[] compressed)
{
using (var memoryStream = new MemoryStream(compressed))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var temp = new MemoryStream())
{
compressionStream.CopyTo(temp);
return(temp.ToArray());
}
}
/// <inheritdoc/>
public override byte[] Decompress(byte[] compressedData, int blockLength)
{
using (var memoryStream = new MemoryStream(compressedData, 0, blockLength))
using (var outputStream = new MemoryStream())
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
{
compressionStream.CopyTo(outputStream);
compressionStream.Flush();
return(outputStream.ToArray());
}
}
/// <summary>
/// Reads and decompresses ZSTD compressed data
/// </summary>
/// <param name="sizeInBytes"></param>
/// <returns></returns>
public byte[] ReadZstdCompressed(int sizeInBytes)
{
byte[] compressed = ReadBytes(sizeInBytes);
using (var memoryStream = new MemoryStream(compressed))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var temp = new MemoryStream())
{
compressionStream.CopyTo(temp);
return(temp.ToArray());
}
}
private byte[] Decompress(byte[] compressed, byte[] dictionaryRaw)
{
using (var memoryStream = new MemoryStream(compressed))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var dictionary = new ZstandardDictionary(dictionaryRaw))
using (var temp = new MemoryStream())
{
compressionStream.CompressionDictionary = dictionary;
compressionStream.CopyTo(temp);
return(temp.ToArray());
}
}
/// <inheritdoc/>
protected override byte[] BaseDecompress(byte[] compressedBytes)
{
using var inputStream = new MemoryStream(compressedBytes);
using var outputStream = new MemoryStream();
using (var gZipStream = new ZstandardStream(inputStream, CompressionMode.Decompress))
{
gZipStream.CopyTo(outputStream, compressedBytes.Length);
outputStream.Flush();
gZipStream.Flush();
}
return(outputStream.ToArray());
}
/// <summary>
/// Decompresses data using the zstd_stream compression algorithm.
/// </summary>
/// <param name="input">The data to decompress.</param>
/// <param name="length">The expected length of the decompressed data.</param>
/// <returns>A decompressed byte array.</returns>
private byte[] DecompressUsingZstdStream(byte[] input, int length)
{
_buffer.Write(input, 0, input.Length);
_buffer.Position -= input.Length;
var target = new MemoryStream();
_zstdDecompressStream.CopyTo(target, length);
_zstdDecompressStream.Flush();
var decompressedData = target.ToArray();
target.Dispose();
_buffer.SetLength(0);
return(decompressedData);
}
/// <summary>
/// decompresses given zstd compressed data
/// </summary>
/// <param name="compressed"></param>
/// <returns></returns>
public static byte[] DecompressZstd(byte[] compressed)
{
using (var memoryStream = new MemoryStream(compressed))
{
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
{
using (var temp = new MemoryStream())
{
compressionStream.CopyTo(temp);
// TODO: Try and avoid the additional copy.
return(temp.ToArray());
}
}
}
}
//-----------------------------------------------------------------------------------------
//-----------------------------------------------------------------------------------------
private static void DictionaryCompression(byte[] input, ZstandardDictionary dictionary, int compressionLevel)
{
var stopwatch = Stopwatch.StartNew();
var compressed = default(byte[]);
var output = default(byte[]);
// compress
using (var memoryStream = new MemoryStream())
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Compress))
{
compressionStream.CompressionLevel = compressionLevel;
compressionStream.CompressionDictionary = dictionary;
compressionStream.Write(input, 0, input.Length);
compressionStream.Close();
compressed = memoryStream.ToArray();
}
// decompress
using (var memoryStream = new MemoryStream(compressed))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var temp = new MemoryStream())
{
compressionStream.CompressionDictionary = dictionary;
compressionStream.CopyTo(temp);
output = temp.ToArray();
}
// test output
if (output.SequenceEqual(input) == false)
{
throw new Exception("Output is different from input!");
}
// write info
Console.WriteLine($"Input : {input.Length}");
Console.WriteLine($"Compressed : {compressed.Length}");
Console.WriteLine($"Output : {output.Length}");
Console.WriteLine($"-------------------------------------------");
Console.WriteLine($"Ratio : {1.0f * input.Length / compressed.Length}");
Console.WriteLine($"Time : {stopwatch.Elapsed.TotalMilliseconds} ms");
Console.WriteLine($"Is64Bit : {Environment.Is64BitProcess}");
Console.WriteLine();
}
public mCPU(byte[] program)
{
//Initialize memory.
mem = new Memory();
byte[] memBlocks;
//Check the type of mCTF program it is.
byte[] signature = program.Take(4).ToArray();
if (signature.SequenceEqual(Constants.STD_MCTF_HEADER))
{
//Copy the entire program into SCODE memory, it's just a standard program.
Log.Debug("Standard mCTF header detected (no compression).");
//Remove the header.
memBlocks = program.Skip(4).ToArray();
}
else if (signature.SequenceEqual(Constants.ZCOMPRESSED_MCTF_HEADER))
{
Log.Debug("Compressed mCTF header detected (zstd compression).");
//Use ZStandard to decompress (past first 4 bytes).
using (var memoryStream = new MemoryStream(program.Skip(4).ToArray()))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var temp = new MemoryStream())
{
compressionStream.CopyTo(temp);
memBlocks = temp.ToArray();
}
}
else
{
Log.Fatal("Invalid mCTF header: " + Encoding.Default.GetString(signature));
return;
}
//Let the memory process the initial memory blocks.
mem.ProcessBlocks(memBlocks);
}
static void Main(string[] args)
{
byte[] input = File.ReadAllBytes(Assembly.GetExecutingAssembly().Location);
byte[] compressed = null;
byte[] output = null;
// load a dictionary that is trained for the data (optional).
// var dictionary = new ZstandardDictionary("loremipsum.zdict");
// compress
using (var memoryStream = new MemoryStream())
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Compress))
{
compressionStream.CompressionLevel = 11; // optional!!
// compressionStream.CompressionDictionary = dictionary; // optional!!
compressionStream.Write(input, 0, input.Length);
compressionStream.Close();
compressed = memoryStream.ToArray();
}
// decompress
using (var memoryStream = new MemoryStream(compressed))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var temp = new MemoryStream())
{
// compressionStream.CompressionDictionary = dictionary; // optional!!
compressionStream.CopyTo(temp);
output = temp.ToArray();
}
// test output
if (output.SequenceEqual(input) == false)
{
throw new Exception("Output is different from input!");
}
Console.ReadLine();
}
private void Decompress(byte[] data)
{
try
{
using (var memoryStream = new MemoryStream(data))
using (var compressionStream = new ZstandardStream(memoryStream, CompressionMode.Decompress))
using (var temp = new MemoryStream())
{
compressionStream.CopyTo(temp);
var output = temp.ToArray();
StringBuilder sb = new StringBuilder(output.Length);
foreach (var b in output)
{
sb.Append($"{b} ");
}
Logging.Info($"Frame data: {sb}");
}
}
catch (Exception e)
{
Logging.Error(e, "An error occurred decompressing block.");
}
}
public static FileArchive LoadFromFile(string filePath)
{
using var fileStream = File.Open(filePath, FileMode.Open, FileAccess.Read);
using var binaryReader = new BinaryReader(fileStream);
// Archive header
var magicNumber = binaryReader.ReadBytes(4);
if (!Enumerable.SequenceEqual(magicNumber, new[] { (byte)'A', (byte)'L', (byte)'E', (byte)'X' }))
{
throw new Exception("Not a valid ALEX file.");
}
var fileMajor = binaryReader.ReadInt32();
var fileMinor = binaryReader.ReadInt32();
if (fileMajor != 01 || fileMinor != 00)
{
throw new Exception($"Unknown file version {fileMajor}.{fileMinor}");
}
binaryReader.ReadBytes(12); // Padding
// Archive directory
var files = new List <FileArchiveFile>();
var fileCount = binaryReader.ReadInt32();
for (int i = 0; i < fileCount; ++i)
{
var fileName = binaryReader.ReadString();
var fileLocation = binaryReader.ReadInt64();
var fileLength = binaryReader.ReadInt64();
var fileCompressionMethod = (CompressionMethod)binaryReader.ReadInt32();
binaryReader.ReadBytes(8); // Padding
files.Add(new FileArchiveFile(
fileName,
fileLocation,
fileLength,
fileCompressionMethod,
new byte[0]
));
}
// File data
foreach (var file in files)
{
binaryReader.BaseStream.Seek(file.FileLocation, SeekOrigin.Begin);
binaryReader.ReadBytes(4); // Padding
List <byte> fileData = new List <byte>();
// Read in chunks
for (long i = 0; i < file.FileLength;)
{
var chunkLen = Math.Min(int.MaxValue, file.FileLength);
fileData.AddRange(binaryReader.ReadBytes((int)chunkLen));
i += chunkLen;
}
if (file.FileCompressionMethod == CompressionMethod.None)
{
file.FileData = fileData.ToArray();
}
else if (file.FileCompressionMethod == CompressionMethod.Zstd)
{
using var memoryStream = new MemoryStream(fileData.ToArray());
using var dcmpMemoryStream = new MemoryStream();
using var compressionStream = new ZstandardStream(memoryStream, System.IO.Compression.CompressionMode.Decompress);
compressionStream.CopyTo(dcmpMemoryStream);
file.FileData = dcmpMemoryStream.ToArray();
}
binaryReader.ReadBytes(4); // Padding
}
return(new FileArchive(files));
}
static void Main(string[] Args)
{
Console.WriteLine("\n BEA Extractor v0.1 - Ac_K:\n" +
"----------------------------\n");
if (Args.Length == 0 || Args.Length > 2)
{
Console.WriteLine("BEAExtractor.exe archive_file.bea out_directory (optionnal - list files if not present)");
}
else
{
using (FileStream Stream = new FileStream(Args[0], FileMode.Open, FileAccess.Read))
{
if (Stream.ReadMagic(0x4) == "SCNE")
{
BinaryReader Reader = new BinaryReader(Stream);
BEAHeader Header = Stream.ReadStruct <BEAHeader>();
string ArchiveName = Stream.ReadName(Header.ArchiveNameOffset);
Console.WriteLine("Header Info:\n" +
$"\tReserved0: 0x{Header.Reserved0.ToString("X2")}\n" +
$"\tUnknown0: 0x{Header.Unknown0.ToString("X2")}\n" +
$"\tByteOrderMark: 0x{Header.ByteOrderMark.ToString("X2")}\n" +
$"\tSectionsNumber: {Header.SectionsNumber}\n" +
$"\tReserved1: 0x{Header.Reserved1.ToString("X2")}\n" +
$"\tUnknown1: 0x{Header.Unknown1.ToString("X2")}\n" +
$"\tFirstASSTSectionOffset0: 0x{Header.FirstASSTSectionOffset0.ToString("X2")}\n" +
$"\t_RLTSectionOffset: 0x{Header._RLTSectionOffset.ToString("X2")}\n" +
$"\tSectionsSize: 0x{Header.SectionsSize.ToString("X2")}\n" +
$"\tFilesNumber: {Header.FilesNumber}\n" +
$"\tASSTInfoSectionOffset: 0x{Header.ASSTInfoSectionOffset.ToString("X2")}\n" +
$"\t_DICSectionOffset: 0x{Header._DICSectionOffset.ToString("X2")}\n" +
$"\tUnknown2: 0x{Header.Unknown2.ToString("X2")}\n" +
$"\tArchiveNameOffset: 0x{Header.ArchiveNameOffset.ToString("X2")}\n" +
$"\tArchiveName: {ArchiveName}\n\n");
List <ASSTSection> FilesInfo = new List <ASSTSection>();
for (int i = 0; i < Header.FilesNumber; i++)
{
Stream.Seek(Header.ASSTInfoSectionOffset + sizeof(long) * i, SeekOrigin.Begin);
Stream.Seek(Reader.ReadInt64(), SeekOrigin.Begin);
if (Stream.ReadMagic(0x4) == "ASST")
{
ASSTSection FileInfo = Stream.ReadStruct <ASSTSection>();
FilesInfo.Add(FileInfo);
}
else
{
throw new Exception("ASST section not found!");
}
}
Console.WriteLine("Files Informations:");
foreach (ASSTSection FileInfo in FilesInfo)
{
string Filename = Stream.ReadName(FileInfo.FilenameOffset).Replace("/", "\\");
Console.WriteLine($"\t{Filename}:\n\n" +
$"\t\tFileOffset: 0x{FileInfo.FileOffset.ToString("X2")}\n" +
$"\t\tFilenameOffset: 0x{FileInfo.FilenameOffset.ToString("X2")}\n" +
$"\t\tCompressionType: 0x{FileInfo.CompressionType}\n" +
$"\t\tCompressedSize: 0x{FileInfo.CompressedSize.ToString("X2")}\n" +
$"\t\tDecompressedSize: 0x{FileInfo.DecompressedSize.ToString("X2")}\n");
if (Args.Length > 1 && Args[1] != "")
{
Filename = Path.Combine(Args[1], Filename);
string DirectoryName = Path.GetDirectoryName(Filename);
Stream.Seek(FileInfo.FileOffset, SeekOrigin.Begin);
byte[] FileData = Reader.ReadBytes(FileInfo.CompressedSize);
if (FileInfo.CompressionType == CompressionType.Zstandard)
{
using (MemoryStream MemStream = new MemoryStream(FileData))
using (ZstandardStream CompStream = new ZstandardStream(MemStream, CompressionMode.Decompress))
using (MemoryStream TempStream = new MemoryStream())
{
CompStream.CopyTo(TempStream);
FileData = TempStream.ToArray();
Console.Write("\t\tDecompressed! ");
}
}
else
{
Console.WriteLine($"\tUnknown compressed type: 0x{FileInfo.CompressionType.ToString("X2")}! File save as Raw.");
}
try
{
Directory.CreateDirectory(DirectoryName);
}
catch (IOException Ex)
{
if (Ex.HResult == -2147024713) //Rename when folder name is same as file name.
{
DirectoryName = Path.Combine(Path.GetDirectoryName(DirectoryName), Path.GetFileName(DirectoryName) + "_dir");
Filename = Path.Combine(DirectoryName, Path.GetFileName(Filename));
Directory.CreateDirectory(DirectoryName);
}
}
File.WriteAllBytes(Filename, FileData);
Console.WriteLine("Extracted!\n");
}
}
Console.WriteLine("Done.");
}
else
{
throw new Exception("BEA Archive file not found!");
}
}
}
}
