DBreeze.Storage.BackupRestorer.DoPackage C# (CSharp) Method

        private void DoPackage(byte[] pack)
        {
            ulong fileNumber = pack.Substring(0, 8).To_UInt64_BigEndian();
            byte type = pack.Substring(8, 1)[0];

            string filename = BackupFNP.ParseFilenameBack(fileNumber);
            long offset = 0;
            byte[] data = null;
            //Console.WriteLine("t: {0}", type);

            //types description
            // 0 - table file, 1 - rollback file, 2 - rollbackhelper, 3 - recreate table file (only table file), 4 - recreate rollback file (only rollback file), 5 - removing complete table

            FileStream lfs = null;
            bool contains = false;
            string tfn = String.Empty;

            switch (type)
            {
                case 0:

                    //Write into table file
                    lfs = this.GetFileStream(filename);

                    //if (lfs == null)
                    //{
                    //    Console.WriteLine("Backup lfs = null");
                    //    return;
                    //}

                    offset = pack.Substring(9, 8).To_Int64_BigEndian();
                    data = pack.Substring(17);
                    lfs.Position = offset;
                    lfs.Write(data, 0, data.Length);
                    lfs.Flush();
                    break;
                case 1:
                    //write into rollback file
                    lfs = this.GetFileStream(filename + ".rol");

                    if (lfs == null)
                    {
                        System.Diagnostics.Debug.WriteLine("Backup lfs = null");
                        return;
                    }

                    offset = pack.Substring(9, 8).To_Int64_BigEndian();
                    data = pack.Substring(17);
                    lfs.Position = offset;
                    lfs.Write(data, 0, data.Length);
                    lfs.Flush();
                    break;
                case 2:
                    //write into rollbackhelper
                    lfs = this.GetFileStream(filename + ".rhp");

                    if (lfs == null)
                    {
                        System.Diagnostics.Debug.WriteLine("Backup lfs = null");
                        return;
                    }

                    offset = pack.Substring(9, 8).To_Int64_BigEndian();
                    data = pack.Substring(17);
                    lfs.Position = offset;
                    lfs.Write(data, 0, data.Length);
                    lfs.Flush();
                    break;
                case 3:

                    //3 - recreate table file (only table file)

                    contains = ds.ContainsKey(filename);
                    if (contains)
                    {
                        ds[filename].Dispose();

                    }

                    tfn = Path.Combine(this.DataBaseFolder, filename);
                    File.Delete(tfn);

                    if (!contains)
                        ds.Add(filename, null);

                    ds[filename] = new FileStream(tfn, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);

                    break;

                case 4:

                    //4 - recreate rollback file (only rollback file)

                    contains = ds.ContainsKey(filename + ".rol");
                    if (contains)
                    {
                        ds[filename + ".rol"].Dispose();

                    }

                    tfn = Path.Combine(this.DataBaseFolder, filename + ".rol");
                    File.Delete(tfn);

                    if (!contains)
                        ds.Add(filename + ".rol", null);

                    ds[filename + ".rol"] = new FileStream(tfn, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);

                    break;
                case 5:

                    //5 - removing complete table

                    if (ds.ContainsKey(filename))
                    {
                        ds[filename].Dispose();
                    }

                    ds.Remove(filename);

                    if (ds.ContainsKey(filename + ".rol"))
                    {
                        ds[filename + ".rol"].Dispose();
                    }

                    ds.Remove(filename + ".rol");

                    if (ds.ContainsKey(filename + ".rhp"))
                    {
                        ds[filename + ".rhp"].Dispose();
                    }

                    ds.Remove(filename + ".rhp");

                    break;

            }
        }