Kdbp format selection by filename. If the filename ends in .kdbp, it is assumed to be kdbp format. Otherwise, kdbx format is used. A file is always saved in the same format it is opened in.

src/KeePassLib2Android/PwDatabase.cs

@@ -588,7 +588,7 @@ namespace KeePassLib
 				kdbx.DetachBinaries = m_strDetachBins;
 
 				Stream s = IOConnection.OpenRead(ioSource);
-				kdbx.Load(s, KdbxFormat.Default, slLogger);
+				kdbx.Load(s, KdbpFile.GetFormatToUse(ioSource), slLogger);
 				s.Close();
 
 				m_pbHashOfLastIO = kdbx.HashOfFileOnDisk;
@@ -623,7 +623,7 @@ namespace KeePassLib
 				Stream s = ft.OpenWrite();
 
 				KdbxFile kdb = new KdbxFile(this);
-				kdb.Save(s, null, KdbxFormat.Default, slLogger);
+				kdb.Save(s, null, KdbpFile.GetFormatToUse(m_ioSource), slLogger);
 
 				ft.CommitWrite();
 

src/KeePassLib2Android/Serialization/KdbxFile.Read.cs

@@ -82,7 +82,7 @@ namespace KeePassLib.Serialization
 				BinaryReaderEx brDecrypted = null;
 				Stream readerStream = null;
 
-				if(kdbFormat == KdbxFormat.Default)
+				if(kdbFormat == KdbxFormat.Default || kdbFormat == KdbxFormat.ProtocolBuffers)
 				{
 					br = new BinaryReaderEx(hashedStream, encNoBom, KLRes.FileCorrupted);
 					ReadHeader(br);
@@ -127,34 +127,21 @@ namespace KeePassLib.Serialization
 				}
 				else m_randomStream = null; // No random stream for plain-text files
 
-				// 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)
+				if (kdbFormat == KdbxFormat.ProtocolBuffers)
 				{
-					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));
 
 				}
+				else
+				{
+					ReadXmlStreamed(readerStream, hashedStream);
+
+					System.Diagnostics.Debug.WriteLine(String.Format("ReadXmlStreamed: {0}ms", stopWatch.ElapsedMilliseconds));
+				}
 
 				readerStream.Close();
 				// GC.KeepAlive(br);

src/KeePassLib2Android/Serialization/KdbxFile.Write.cs

@@ -101,7 +101,7 @@ namespace KeePassLib.Serialization
 				m_pbStreamStartBytes = cr.GetRandomBytes(32);
 
 				Stream writerStream;
-				if(m_format == KdbxFormat.Default)
+				if(m_format == KdbxFormat.Default || m_format == KdbxFormat.ProtocolBuffers)
 				{
 					WriteHeader(hashedStream); // Also flushes the stream
 
@@ -122,17 +122,24 @@ namespace KeePassLib.Serialization
 					writerStream = hashedStream;
 				else { Debug.Assert(false); throw new FormatException("KdbFormat"); }
 
-				/*
-				m_xmlWriter = new XmlTextWriter(writerStream, encNoBom);
-				WriteDocument(pgDataSource);
+				var stopWatch = Stopwatch.StartNew();
 
-				m_xmlWriter.Flush();
-				m_xmlWriter.Close();
-				*/
+				if (m_format == KdbxFormat.ProtocolBuffers)
+				{
+					KdbpFile.WriteDocument(m_pwDatabase, writerStream, m_pbProtectedStreamKey, m_pbHashOfHeader);
+				}
+				else
+				{
+					m_xmlWriter = new XmlTextWriter(writerStream, encNoBom);
+					WriteDocument(pgDataSource);
 
-				KdbpFile.WriteDocument(m_pwDatabase, writerStream, m_pbProtectedStreamKey, m_pbHashOfHeader);
+					m_xmlWriter.Flush();
+					m_xmlWriter.Close();
+				}
 
 				writerStream.Close();
+
+				System.Diagnostics.Debug.WriteLine(String.Format("{1}: {0}ms", stopWatch.ElapsedMilliseconds, m_format == KdbxFormat.ProtocolBuffers ? "KdbpFile.WriteDocument" : "Xml WriteDocument"));
 			}
 			finally { CommonCleanUpWrite(sSaveTo, hashedStream); }
 		}

src/KeePassLib2Android/Serialization/KdbxFile.cs

@@ -52,7 +52,8 @@ namespace KeePassLib.Serialization
 		/// <summary>
 		/// Use this flag when exporting data to a plain-text XML file.
 		/// </summary>
-		PlainXml
+		PlainXml,
+		ProtocolBuffers
 	}
 
 	/// <summary>

src/KeePassLib2Android/Serialization/ProtoBuf/KdbpFile.cs

@@ -1,18 +1,29 @@
 using System;
 using System.Collections.Generic;
-using System.Text;
-using ProtoBuf;
 using System.Drawing;
-using KeePassLib.Collections;
-using KeePassLib.Security;
-using KeePassLib.Cryptography;
 using System.IO;
+using KeePassLib.Collections;
+using KeePassLib.Cryptography;
+using KeePassLib.Security;
+using KeePassLib.Utility;
+using ProtoBuf;
 using ProtoBuf.Meta;
 
 namespace KeePassLib.Serialization
 {
 	internal class KdbpFile
 	{
+		public const string FileNameExtension = "kdbp";
+
+		/// <summary>
+		/// Determines whether the database pointed to by the specified ioc should be (de)serialised in default (xml) or protocol buffers format.
+		/// </summary>
+		public static KdbxFormat GetFormatToUse(IOConnectionInfo ioc)
+		{
+			// If the filename ends in .kdbp, use ProtocolBuffers format.
+			return UrlUtil.GetExtension(UrlUtil.GetFileName(ioc.Path)).Equals(KdbpFile.FileNameExtension, StringComparison.OrdinalIgnoreCase) ? KdbxFormat.ProtocolBuffers : KdbxFormat.Default;
+		}
+
 		public static void WriteDocument(PwDatabase database, Stream stream, byte[] protectedStreamKey, byte[] hashOfHeader)
 		{
 			var context = new SerializationContext