GitSharp.Core.ObjectWriter.WriteObject C# (CSharp) Method

        internal ObjectId WriteObject(ObjectType type, long len, Stream input, bool store)
        {
            FileInfo info;
            DeflaterOutputStream stream;
            FileStream stream2;
            ObjectId objectId = null;

            if (store)
            {
                info = _r.ObjectsDirectory.CreateTempFile("noz");
                stream2 = info.OpenWrite();
            }
            else
            {
                info = null;
                stream2 = null;
            }

            _md.Reset();
            if (store)
            {
                _def.Reset();
                stream = new DeflaterOutputStream(stream2, _def);
            }
            else
            {
                stream = null;
            }

            try
            {
                int num;
                byte[] bytes = Codec.EncodedTypeString(type);
                _md.Update(bytes);
                if (stream != null)
                {
                    stream.Write(bytes, 0, bytes.Length);
                }

                _md.Update(0x20);
                if (stream != null)
                {
                    stream.WriteByte(0x20);
                }

                bytes = Constants.encodeASCII(len.ToString());
                _md.Update(bytes);
                if (stream != null)
                {
                    stream.Write(bytes, 0, bytes.Length);
                }

                _md.Update(0);
                if (stream != null)
                {
                    stream.WriteByte(0);
                }
                while ((len > 0L) && ((num = input.Read(_buf, 0, (int) Math.Min(len, _buf.Length))) > 0))
                {
                    _md.Update(_buf, 0, num);
                    if (stream != null)
                    {
                        stream.Write(_buf, 0, num);
                    }
                    len -= num;
                }

                if (len != 0L)
                {
                    throw new IOException("Input did not match supplied Length. " + len + " bytes are missing.");
                }

                if (stream != null)
                {
                    stream.Close();
                    if (info != null)
                    {
                        info.IsReadOnly = true;
                    }
                }
                objectId = ObjectId.FromRaw(_md.Digest());
            }
            finally
            {
                if ((objectId == null) && (stream != null))
                {
                    try
                    {
                        stream.Close();
                    }
                    finally
                    {
                        info.DeleteFile();
                    }
                }
            }
            if (info != null)
            {
                if (_r.HasObject(objectId))
                {
                // Object is already in the repository so remove
                // the temporary file.
                //
                  info.DeleteFile();
                }
                else
                {
                    FileInfo info2 = _r.ToFile(objectId);
                    if (!info.RenameTo(info2.FullName))
                    {
                    // Maybe the directory doesn't exist yet as the object
                    // directories are always lazily created. Note that we
                    // try the rename first as the directory likely does exist.
                    //
                        if (info2.Directory != null)
                        {
                            info2.Directory.Create();
                        }
                        if (!info.RenameTo(info2.FullName) && !_r.HasObject(objectId))
                        {
                        // The object failed to be renamed into its proper
                        // location and it doesn't exist in the repository
                        // either. We really don't know what went wrong, so
                        // fail.
                        //
                            info.DeleteFile();
                            throw new ObjectWritingException("Unable to create new object: " + info2);
                        }
                    }
                }
            }
            return objectId;
        }

 private ObjectId GenSha1(string data)
 {
     var input = new MemoryStream(data.getBytes());
     var writer = new ObjectWriter(db);
     try
     {
         return writer.WriteObject(ObjectType.Blob, data.getBytes().Length, input, true);
     }
     catch (IOException exception)
     {
         Assert.Fail(exception.ToString());
     }
     return null;
 }