Added a simple interface for using SharpRsync on either streams or files.

git-svn-id: https://duplicati.googlecode.com/svn/trunk@44 59da171f-624f-0410-aa54-27559c288bec

Duplicati/SharpRSync/Duplicati.SharpRSync.csproj

@@ -41,6 +41,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="RDiffBinary.cs" />
     <Compile Include="RollingBuffer.cs" />
+    <Compile Include="SharpRSyncInterface.cs" />
     <Compile Include="Utility.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />

Duplicati/SharpRSync/SharpRSyncInterface.cs

@@ -0,0 +1,101 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+
+namespace Duplicati.Main
+{
+    /// <summary>
+    /// This class wraps the usage of SharpRSync into an easy to use static class
+    /// </summary>
+    public class SharpRSyncInterface
+    {
+        /// <summary>
+        /// Generates a signature, and writes it to the stream
+        /// </summary>
+        /// <param name="input">The stream to create the signature for</param>
+        /// <param name="output">The stream to write the signature into</param>
+        public static void GenerateSignature(Stream input, Stream output)
+        {
+            SharpRSync.ChecksumFile cs = new Duplicati.SharpRSync.ChecksumFile();
+            cs.AddStream(input);
+            cs.Save(output);
+        }
+
+        /// <summary>
+        /// Generates a signature file
+        /// </summary>
+        /// <param name="filename">The file to create the signature for</param>
+        /// <param name="outputfile">The file write the signature to</param>
+        public static void GenerateSignature(string filename, string outputfile)
+        {
+            if (System.IO.File.Exists(outputfile))
+                System.IO.File.Delete(outputfile);
+
+            using (FileStream fs1 = File.OpenRead(filename))
+            using (FileStream fs2 = File.Create(outputfile))
+                GenerateSignature(fs1, fs2);
+        }
+
+        /// <summary>
+        /// Generates a delta stream
+        /// </summary>
+        /// <param name="signature">The signature for the stream</param>
+        /// <param name="filename">The (possibly) altered stream to create the delta for</param>
+        /// <param name="output">The delta output</param>
+        public static void GenerateDelta(Stream signature, Stream input, Stream output)
+        {
+            SharpRSync.ChecksumFile cs = new Duplicati.SharpRSync.ChecksumFile(signature);
+            SharpRSync.DeltaFile df = new Duplicati.SharpRSync.DeltaFile(cs);
+            df.GenerateDeltaFile(input, output);
+        }
+
+
+        /// <summary>
+        /// Generates a delta file
+        /// </summary>
+        /// <param name="signaturefile">The signature for the file</param>
+        /// <param name="filename">The file to create the delta for</param>
+        /// <param name="deltafile">The delta output file</param>
+        public static void GenerateDelta(string signaturefile, string filename, string deltafile)
+        {
+            if (System.IO.File.Exists(deltafile))
+                System.IO.File.Delete(deltafile);
+
+            using (FileStream fs1 = File.OpenRead(signaturefile))
+            using (FileStream fs2 = File.OpenRead(filename))
+            using (FileStream fs3 = File.Create(deltafile))
+                GenerateDelta(fs1, fs2, fs3);
+        }
+
+        /// <summary>
+        /// Patches a file
+        /// </summary>
+        /// <param name="basefile">The most recent full copy of the file</param>
+        /// <param name="deltafile">The delta file</param>
+        /// <param name="outputfile">The restored file</param>
+        public static void PatchFile(string basefile, string deltafile, string outputfile)
+        {
+            if (System.IO.File.Exists(outputfile))
+                System.IO.File.Delete(outputfile);
+
+            using (FileStream fs1 = File.OpenRead(basefile))
+            using (FileStream fs2 = File.OpenRead(deltafile))
+            using (FileStream fs3 = File.Create(outputfile))
+                PatchFile(fs1, fs2, fs3);
+        }
+
+        /// <summary>
+        /// Constructs a stream from a basestream and a delta stream
+        /// </summary>
+        /// <param name="basefile">The most recent full copy of the file</param>
+        /// <param name="deltafile">The delta file</param>
+        /// <param name="outputfile">The restored file</param>
+        public static void PatchFile(Stream basestream, Stream delta, Stream output)
+        {
+            SharpRSync.DeltaFile df = new Duplicati.SharpRSync.DeltaFile(delta);
+            df.PatchFile(basestream, output);
+        }
+
+    }
+}