Generic Xbox360 Compression Library

[fairchild]

This is a Library written in (unmanaged) C/C++ that can be used in your .NET (C# example available) applications to decompress and compress the compressed data from the savegame.

Make sure to give credits if used in your application.

Update:

So, lzopro gave me a hard time as it's not ment to be used the way i wanted it. Took some time to fix this but here is a new version that should work as expected.

Example (C#):

[DllImport("compress.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern uint lzo_decompress([Out] byte[] compressed_buffer, uint compressed_size, [In] byte[] decompressed_buffer, uint decompressed_size, uint method);

[DllImport("compress.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern uint lzo_compress([Out] byte[] decompressed_buffer, uint decompressed_size, [In] byte[] compressed_buffer, uint compressed_size, uint method, uint compress_level);

void MyFunction()
{
            UInt32 decompressed_size = <decompressed size>;
            byte[] decompressed_buffer = new byte[decompressed_size];

            uint compressed_size = <compressed size>;
            uint result = lzo_decompress(compressed_buffer, compressed_size, decompressed_buffer, decompressed_size, COMP_LZOPRO1X);

            // result now contains the real decompressed size and decompressed_buffer contains the decompressed data.
}

Available compression methods:

enum {
    // decompressors
    COMP_NONE = 0,			// No compression
    COMP_ZLIB,				// RFC 1950
    COMP_DEFLATE,			// RFC 1951
    COMP_LZO1,				// LZO 1 Freeware
    COMP_LZO1A,				// LZO 1a Freeware
    COMP_LZO1B,				// LZO 1b (safe with overrun) Freeware
    COMP_LZO1C,				// LZO 1c (safe with overrun) Freeware
    COMP_LZO1F,				// LZO 1f (safe with overrun) Freeware
    COMP_LZO1X,				// LZO 1x (safe with overrun) Freeware
    COMP_LZO1Y,				// LZO 1y (safe with overrun) Freeware
    COMP_LZO1Z,				// LZO 1z (safe with overrun) Freeware
    COMP_LZO2A,				// LZO 2a (safe with overrun) Freeware
    COMP_LZOPRO1X,			// LZOPRO 1x (safe with overrun) Freeware
    COMP_LZOPRO1Y,			// LZOPRO 1y (safe with overrun) Freeware

    // compressors
    COMP_LZO1_COMPRESS,		// LZO 1 Freeware
    COMP_LZO1_99_COMPRESS,	// better compression ratio at the cost of more memory and time
    COMP_LZO1A_COMPRESS,	// LZO 1a Freeware
    COMP_LZO1A_99_COMPRESS,	// better compression ratio at the cost of more memory and time
    COMP_LZO1B_COMPRESS,	// LZO 1b Freeware  (Valid compression level: 1..9)
    COMP_LZO1B_99_COMPRESS,	// better compression ratio at the cost of more memory and time
    COMP_LZO1B_999_COMPRESS,// even better compression ratio at the cost of more memory and time
    COMP_LZO1C_COMPRESS,	// LZO 1c Freeware  (Valid compression level: 1..9)
    COMP_LZO1C_99_COMPRESS,	// better compression ratio at the cost of more memory and time
    COMP_LZO1C_999_COMPRESS,// even better compression ratio at the cost of more memory and time
    COMP_LZO1F_COMPRESS,	// LZO 1f Freeware
    COMP_LZO1F_999_COMPRESS,// even better compression ratio at the cost of more memory and time
    COMP_LZO1X_COMPRESS,	// LZO 1x Freeware
    COMP_LZO1X_999_COMPRESS,// even better compression ratio at the cost of more memory and time
    COMP_LZO1Y_COMPRESS,	// LZO 1y Freeware
    COMP_LZO1Y_999_COMPRESS,// even better compression ratio at the cost of more memory and time
    COMP_LZO1Z_COMPRESS,	// LZO 1z Freeware
    COMP_LZO1Z_999_COMPRESS,// even better compression ratio at the cost of more memory and time
    COMP_LZO2A_COMPRESS,       // LZO 2a Freeware
    COMP_LZO2A_999_COMPRESS,   // even better compression ratio at the cost of more memory and time
    COMP_LZOPRO1X_COMPRESS,    // LZOPRO 1x	(Valid compression level: 1..10)
    COMP_LZOPRO1Y_COMPRESS,    // LZOPRO 1y	(Valid compression level: 1..10)
};

[CloudStrife7x]

awesome work on this fair

[thegutta]

Excellent work Fairchild :)

[Serious_M]

very nice work as always fairchild

[kill_seth]

Can't seem to get it working in VB.Net

<DllImport("compress.dll", CallingConvention:=CallingConvention.Cdecl)> _
    Public Shared Function lzo_decompress(<Out> compressed_buffer As Byte(), compressed_size As UInteger, <[In]> decompressed_buffer As Byte(), decompressed_size As UInteger, type As UInteger) As UInteger
    End Function

Private Function Decompress(compressedData As Byte()) As Byte()
        Dim decompressedSize As UInt32 = dSize
        Dim decompressedData As Byte() = New Byte(decompressedSize) {}
        Dim compressedSize As UInt32 = cSize
        lzo_decompress(compressedData, compressedSize, decompressedData, decompressedSize, 0)
        Return decompressedData
End Function

When I go to call the function I get: Unable to load DLL 'compress.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

I placed the dll in the Application.StartUpPath and in Windows\System32

[PUR3 RAF3X]

Yes the same prob here. I have try use another ways but nothing work with this dll.

Imports PackageIO
Imports System.Text
Imports System
Imports System.Runtime.InteropServices

Public Declare Function lzo_decompress Lib "C:\Users\****\Documents\Visual Studio 2010\Projects\WindowsApplication5\WindowsApplication5\obj\x86\Debug\compress.dll" (ByVal Compressed_Buffer() As Byte, ByVal Compressed_Buffersize As UInteger, ByVal decompressed_buffer() As Byte, ByVal decompressed_size As UInteger, ByVal type As UInteger) As Integer

   <DllImport("compress.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.Cdecl)> _
    Public Shared Function lzo_decompress(<Out()> compressed_buffer As Byte(), compressed_size As UInteger, <[In]()> decompressed_buffer As Byte(), decompressed_size As UInteger, type As UInteger) As UInteger
    End Function

    Dim FilePath As String

    Dim Compressed_Buffer() As Byte
    Dim decompressed_size As UInteger
    Dim compressed_size As UInteger

 Private Sub Decompressdata()

        Dim reader As New PackageIO.Reader(FilePath, Endian.Big)
        reader.Position = 28
        decompressed_size = reader.ReadInt32()
        Dim decompressed_buffer As Byte() = New Byte((decompressed_size)) {}
        Compressed_Buffer = reader.ReadBytes(reader.Length, Endian.Little)
        compressed_size = Compressed_Buffer.Length
        decompressed_buffer = {(lzo_decompress(Compressed_Buffer, compressed_size, decompressed_buffer, decompressed_size, 0))}
        System.IO.File.WriteAllBytes(Application.StartupPath + "/SaveGame.dat", decompressed_buffer)

    End Sub

[Jappi88]

U guys can try whatever u want...it wont work...its not the way u coded it...fairchild forget to inlcude the maindll.

[PUR3 RAF3X]

Whats happen with this dll?