Strictly for experimentation. When saving a databse, it will be saved in protocol buffer format. Opening will work for either xml or protocol buffers.

src/KeePassLib2Android/KeePassLib2Android.csproj

@@ -47,6 +47,9 @@
     <AndroidLinkMode>SdkOnly</AndroidLinkMode>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="protobuf-net">
+      <HintPath>..\ProtoBuf\protobuf-net.dll</HintPath>
+    </Reference>
     <Reference Include="System" />
     <Reference Include="System.Xml" />
     <Reference Include="System.Core" />
@@ -126,6 +129,7 @@
     <Compile Include="Serialization\KdbxFile.Write.cs" />
     <Compile Include="Serialization\IOConnectionInfo.cs" />
     <Compile Include="Serialization\OldFormatException.cs" />
+    <Compile Include="Serialization\ProtoBuf\KdbpFile.cs" />
     <Compile Include="Translation\KPControlCustomization.cs" />
     <Compile Include="Translation\KPFormCustomization.cs" />
     <Compile Include="Translation\KPStringTable.cs" />

src/KeePassLib2Android/Serialization/KdbxFile.Read.cs

@@ -127,8 +127,34 @@ namespace KeePassLib.Serialization
 				}
 				else m_randomStream = null; // No random stream for plain-text files
 
-				ReadXmlStreamed(readerStream, hashedStream);
-				// ReadXmlDom(readerStream);
+				// Test: read to memory
+				var stopWatch = Stopwatch.StartNew();
+				var memStream = new MemoryStream((int)hashedStream.Length);
+				CopyStream(readerStream, memStream);
+				readerStream.Close();
+				readerStream = memStream;
+				System.Diagnostics.Debug.WriteLine(String.Format("Copy input stream: {0}ms", stopWatch.ElapsedMilliseconds));
+				
+				var isXml = memStream.ReadByte() == '<';
+				memStream.Seek(0, SeekOrigin.Begin);
+					
+				if (isXml)
+				{
+					stopWatch.Restart();
+
+					ReadXmlStreamed(readerStream, hashedStream);
+					System.Diagnostics.Debug.WriteLine(String.Format("ReadXmlStreamed: {0}ms", stopWatch.ElapsedMilliseconds));
+
+				}
+				else
+				{
+					stopWatch.Restart();
+					
+					KdbpFile.ReadDocument(m_pwDatabase, readerStream, m_pbProtectedStreamKey, m_pbHashOfHeader);
+
+					System.Diagnostics.Debug.WriteLine(String.Format("KdbpFile.ReadDocument: {0}ms", stopWatch.ElapsedMilliseconds));
+
+				}
 
 				readerStream.Close();
 				// GC.KeepAlive(br);
@@ -141,6 +167,17 @@ namespace KeePassLib.Serialization
 			finally { CommonCleanUpRead(sSource, hashedStream); }
 		}
 
+		public static void CopyStream(Stream input, Stream output)
+		{
+			byte[] buffer = new byte[4096];
+			int read;
+			while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
+			{
+				output.Write(buffer, 0, read);
+			}
+			output.Seek(0, SeekOrigin.Begin);
+		}
+
 		private void CommonCleanUpRead(Stream sSource, HashingStreamEx hashedStream)
 		{
 			hashedStream.Close();

src/KeePassLib2Android/Serialization/KdbxFile.Write.cs

@@ -122,11 +122,16 @@ namespace KeePassLib.Serialization
 					writerStream = hashedStream;
 				else { Debug.Assert(false); throw new FormatException("KdbFormat"); }
 
+				/*
 				m_xmlWriter = new XmlTextWriter(writerStream, encNoBom);
 				WriteDocument(pgDataSource);
 
 				m_xmlWriter.Flush();
 				m_xmlWriter.Close();
+				*/
+
+				KdbpFile.WriteDocument(m_pwDatabase, writerStream, m_pbProtectedStreamKey, m_pbHashOfHeader);
+
 				writerStream.Close();
 			}
 			finally { CommonCleanUpWrite(sSaveTo, hashedStream); }