ME3Explorer.Unreal.DLCPackage.ReBuild C# (CSharp) Method

        public void ReBuild()
        {
            string path = Path.GetDirectoryName(FileName) + "\\" + Path.GetFileNameWithoutExtension(FileName) + ".tmp";
            FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write);
            
            DebugOutput.PrintLn("Creating Header Dummy...");
            for (int i = 0; i < 8; i++)
                fs.Write(BitConverter.GetBytes(0), 0, 4);
            Header.EntryOffset = 0x20;
            DebugOutput.PrintLn("Creating File Table...");
            for (int i = 0; i < Header.FileCount; i++)
            {
                FileEntryStruct e = Files[i];
                fs.Write(e.Hash, 0, 16);
                fs.Write(BitConverter.GetBytes(e.BlockSizeIndex), 0, 4);
                fs.Write(BitConverter.GetBytes(e.UncompressedSize), 0, 4);
                fs.WriteByte(e.UncompressedSizeAdder);
                fs.Write(BitConverter.GetBytes(e.DataOffset), 0, 4);
                fs.WriteByte(e.DataOffsetAdder);                
            }
            Header.BlockTableOffset = (uint)fs.Position;
            DebugOutput.PrintLn("Creating Block Table...");
            for (int i = 0; i < Header.FileCount; i++)
                if (Files[i].BlockSizeIndex != 0xFFFFFFFF)
                    foreach (ushort u in Files[i].BlockSizes)
                        fs.Write(BitConverter.GetBytes(u), 0, 2);
            Header.DataOffset = (uint)fs.Position;
            DebugOutput.PrintLn("Appending Files...");
            uint pos = (uint)fs.Position;
            for (int i = 0; i < Header.FileCount; i++)
            {
                List<byte[]> blocks = GetBlocks(i);
                FileEntryStruct e = Files[i];
                DebugOutput.PrintLn("Rebuilding \"" + e.FileName + "\" (" + (i + 1) + "/" + Header.FileCount + ") " + BytesToString(e.UncompressedSize) + " ...");
                e.DataOffset = pos;
                e.DataOffsetAdder = 0;                
                for (int j = 0; j < blocks.Count; j++)
                {
                    MemoryStream m = new MemoryStream(blocks[j]);
                    fs.Write(m.ToArray(), 0, (int)m.Length);
                    pos += (uint)m.Length;
                }
                Files[i] = e;
            }
            DebugOutput.PrintLn("Updating FileTable...");
            fs.Seek(0x20, 0);
            pos = (uint)fs.Position;
            uint blocksizeindex = 0;
            for (int i = 0; i < Header.FileCount; i++)
            {
                FileEntryStruct e = Files[i];
                fs.Write(e.Hash, 0, 16);
                if (e.BlockSizeIndex != 0xFFFFFFFF)
                {
                    fs.Write(BitConverter.GetBytes(blocksizeindex), 0, 4);
                    e.BlockSizeIndex = blocksizeindex;
                    blocksizeindex += (uint)e.BlockSizes.Length;
                }
                else
                    fs.Write(BitConverter.GetBytes(0xFFFFFFFF), 0, 4);
                fs.Write(BitConverter.GetBytes(e.UncompressedSize), 0, 4);
                fs.WriteByte(e.UncompressedSizeAdder);
                fs.Write(BitConverter.GetBytes(e.DataOffset), 0, 4);
                fs.WriteByte(e.DataOffsetAdder);
                e.MyOffset = pos;
                Files[i] = e;
                pos += 0x1E;                    
            }
            fs.Seek(0, 0);
            DebugOutput.PrintLn("Rebuilding Header...");
            fs.Write(BitConverter.GetBytes(Header.Magic), 0, 4);
            fs.Write(BitConverter.GetBytes(Header.Version), 0, 4);
            fs.Write(BitConverter.GetBytes(Header.DataOffset), 0, 4);
            fs.Write(BitConverter.GetBytes(Header.EntryOffset), 0, 4);
            fs.Write(BitConverter.GetBytes(Header.FileCount), 0, 4);
            fs.Write(BitConverter.GetBytes(Header.BlockTableOffset), 0, 4);
            fs.Write(BitConverter.GetBytes(Header.MaxBlockSize), 0, 4);
            foreach (char c in Header.CompressionScheme)
                fs.WriteByte((byte)c);
            fs.Close();
            File.Delete(FileName);
            File.Move(path, FileName);
        }