Patcher/PatchClient/MainWindow.xaml.cs

@@ -21,24 +21,18 @@ namespace PatchClient
         {
             Task.Run(() =>
             {
-                FilePatcher bp = new FilePatcher()
+                PatchHelper patcher = new PatchHelper(Environment.CurrentDirectory, null, LazyOperations.PatchFolder.FromCwd());
-                {
-                    TargetBase = Environment.CurrentDirectory,
-                    PatchBase = LazyOperations.PatchFolder.FromCwd()
-                };
 
-                bp.ProgressChanged += Bp_ProgressChanged;
+                patcher.ProgressChanged += patcher_ProgressChanged;
 
                 try
                 {
-                    if (bp.Run())
+                    LazyOperations.CleanupTempDir();
-                    {
+                    LazyOperations.PrepTempDir();
-                        MessageBox.Show("Patch completed without issues", "Patching Successful");
+
-                    }
+                    string message = patcher.ApplyPatches();
-                    else
+
-                    {
+                    MessageBox.Show(message, "Patcher");
-                        MessageBox.Show("Failed to patch client.", "Patching Failed", MessageBoxButton.OK, MessageBoxImage.Error);
-                    }
                 }
                 catch(Exception ex)
                 {
@@ -54,7 +48,7 @@ namespace PatchClient
             });
         }
 
-        private void Bp_ProgressChanged(object Sender, int Progress, int Total, int Percent, string Message = "", params LineItem[] AdditionalLineItems)
+        private void patcher_ProgressChanged(object Sender, int Progress, int Total, int Percent, string Message = "", params LineItem[] AdditionalLineItems)
         {
             string additionalInfo = "";
             foreach (LineItem item in AdditionalLineItems)

Patcher/PatchClient/PatchClient.csproj

@@ -6,6 +6,14 @@
     <UseWPF>true</UseWPF>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Remove="Resources\xdelta3.exe" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Include="Resources\xdelta3.exe" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\PatcherUtils\PatcherUtils.csproj" />
   </ItemGroup>

Patcher/PatchClient/Properties/launchSettings.json

@@ -0,0 +1,7 @@
+{
+  "profiles": {
+    "PatchClient": {
+      "commandName": "Project"
+    }
+  }
+}

Patcher/PatchGenerator/MainWindow.xaml.cs

@@ -120,13 +120,14 @@ namespace PatchGenerator
             GenProgressBar.DispatcherSetIndetermination(false);
 
             //generate patches
-            FileCompare bc = new FileCompare(targetFolder, compareFolder, patchBase);
+            //TODO - fix these weird variable names (why did I do this?)
+            PatchHelper patcher = new PatchHelper(compareFolder, targetFolder, patchBase);
 
-            bc.ProgressChanged += Bc_ProgressChanged;
+            patcher.ProgressChanged += patcher_ProgressChanged;
 
-            if (!bc.CompareAll())
+            if (!patcher.GeneratePatches())
             {
-                MessageBox.Show("Failed to generate diffs.", ":(", MessageBoxButton.OK, MessageBoxImage.Error);
+                MessageBox.Show("One of the provided folder paths doesn't exist.", "Oops  :(", MessageBoxButton.OK, MessageBoxImage.Error);
             }
 
             //Copy patch client to output folder
@@ -142,7 +143,7 @@ namespace PatchGenerator
             GenProgressMessageLabel.DispaatcherSetContent("Done");
         }
 
-        private void Bc_ProgressChanged(object Sender, int Progress, int Total, int Percent, string Message = "", params LineItem[] AdditionalLineItems)
+        private void patcher_ProgressChanged(object Sender, int Progress, int Total, int Percent, string Message = "", params LineItem[] AdditionalLineItems)
         {
             string additionalInfo = "";
             foreach (LineItem item in AdditionalLineItems)

Patcher/PatchGenerator/PatchGenerator.csproj

@@ -11,15 +11,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <Reference Include="Aki.ByteBanger">
-      <HintPath>References\Aki.ByteBanger.dll</HintPath>
-    </Reference>
     <Reference Include="Aki.Common">
       <HintPath>References\Aki.Common.dll</HintPath>
     </Reference>
-    <Reference Include="ComponentAce.Compression.Libs.zlib">
-      <HintPath>References\ComponentAce.Compression.Libs.zlib.dll</HintPath>
-    </Reference>
   </ItemGroup>
 
 </Project>

Patcher/PatcherUtils/FileCompare.cs

@@ -1,185 +0,0 @@
-// NOTES:
-// - redo search pattern;
-//   - compare both directories against eachother, not just one to the other
-//   - add ability to handle missing directories
-
-using System.IO;
-using Aki.Common.Utils;
-using Aki.ByteBanger;
-using System;
-using System.Collections.Generic;
-using System.Linq;
-
-namespace PatcherUtils
-{
-    public class FileCompare
-    {
-        public string PatchBase;
-        public string TargetBase;
-        public string CompareBase;
-        private int fileCount;
-        private int fileIt;
-
-        private int diffCount = 0;
-        private int newCount = 0;
-        private int delCount = 0;
-        private int matchCount = 0;
-
-        private List<FileInfo> TargetPaths;
-        private List<FileInfo> ComparePaths;
-        private List<LineItem> AdditionalInfo = new List<LineItem>();
-
-        /// <summary>
-        /// Provides patch generation progress changes
-        /// </summary>
-        public event ProgressChangedHandler ProgressChanged;
-        protected virtual void RaiseProgressChanged(int progress, int total, string Message = "", params LineItem[] AdditionalLineItems)
-        {
-            int percent = (int)Math.Floor((double)progress / total * 100);
-
-            ProgressChanged?.Invoke(this, progress, total, percent, Message, AdditionalLineItems);
-        }
-
-        /// <summary>
-        /// Compare a target file to an assumed compareable file.
-        /// </summary>
-        /// <param name="targetFile">The known target path</param>
-        /// <param name="assumedCompareFile">The assumed comparable file path</param>
-        /// <returns>True if a comparison was made | False if a comparison could not be made</returns>
-        private bool Compare(string targetFile, string assumedCompareFile)
-        {
-            string patchFilePath = targetFile.Replace(TargetBase, PatchBase);
-            //we know our target file exists
-            byte[] targetData = VFS.ReadFile(targetFile);
-
-            if(!File.Exists(assumedCompareFile))
-            {
-                //save the data we won't have in our target as new
-                VFS.WriteFile($"{patchFilePath}.new", Zlib.Compress(targetData, ZlibCompression.Maximum));
-                newCount++;
-                return true;
-            }
-
-            //now our compare file is known to exist
-            byte[] compareData = VFS.ReadFile(assumedCompareFile);
-
-            // get diffs
-            DiffResult result = PatchUtil.Diff(compareData, targetData);
-
-            switch (result.Result)
-            {
-                case DiffResultType.Success:
-                    VFS.WriteFile($"{patchFilePath}.bpf", result.PatchInfo.ToBytes());
-                    diffCount++;
-                    return true;
-
-                case DiffResultType.FilesMatch:
-                    matchCount++;
-                    return true;
-
-                default:
-                    return false;
-            }
-        }
-
-        /// <summary>
-        /// Compares the base folders and generates patch files.
-        /// </summary>
-        /// <returns>True if patches were generated successfully | False if patch generation failed</returns>
-        public bool CompareAll()
-        {
-            DirectoryInfo targetDirInfo = new DirectoryInfo(TargetBase);
-            DirectoryInfo compareDirInfo = new DirectoryInfo(CompareBase);
-
-            AdditionalInfo.Add(new LineItem("Diff Patch", "0"));
-            AdditionalInfo.Add(new LineItem("New Patch", "0"));
-            AdditionalInfo.Add(new LineItem("Del Patch", "0"));
-            AdditionalInfo.Add(new LineItem("Files Match", "0"));
-
-            if (!targetDirInfo.Exists || !compareDirInfo.Exists)
-            {
-                Console.WriteLine("Target or Compare folder does not exist");
-                return false;
-            }
-
-            //Get all the files recursively
-            TargetPaths = new List<FileInfo>(targetDirInfo.GetFiles("*.*", SearchOption.AllDirectories));
-            ComparePaths = new List<FileInfo>(compareDirInfo.GetFiles("*.*", SearchOption.AllDirectories));
-
-            RaiseProgressChanged(0, fileCount, "Generating diffs...");
-
-            /* Comparing Target files -> Compare files
-             *     - Exists        = Diff (.bfd file)
-             *     - Doesn't Exist = New (.new file)
-             * 
-             * Once everything has been compared from one side, any remaining paths in our ComparePaths
-             * are things that don't exist in our target and can be deleted (.del file)
-             */
-
-            for (int x = 0; x < TargetPaths.Count; x++)
-            {
-                FileInfo file = TargetPaths[x];
-
-                string assumedComparePath = file.DirectoryName.Replace(TargetBase, CompareBase);
-
-                if (!Compare(file.FullName, VFS.Combine(assumedComparePath, file.Name)))
-                {
-                    return false;
-                }
-
-                //remove any existing files from our ComparePaths
-                FileInfo assumedFile = new FileInfo(VFS.Combine(assumedComparePath, file.Name));
-                if (assumedFile.Exists && ComparePaths.Exists(x => x.FullName == assumedFile.FullName))
-                {
-                    ComparePaths.Remove(ComparePaths.Where(x => x.FullName == assumedFile.FullName).FirstOrDefault());
-                }
-
-
-                AdditionalInfo[0].ItemValue = diffCount.ToString();
-                AdditionalInfo[1].ItemValue = newCount.ToString();
-                AdditionalInfo[3].ItemValue = matchCount.ToString();
-
-                fileIt++;
-                RaiseProgressChanged(fileIt, fileCount, file.Name, AdditionalInfo.ToArray());
-            }
-
-            
-            if (ComparePaths.Count == 0)
-            {
-                //if there are no files to delete, just return true
-                return true;
-            }
-
-            //progress reset for files that need to be deleted
-            RaiseProgressChanged(0, ComparePaths.Count, "Processing .del files...");
-            fileIt = 0;
-            fileCount = ComparePaths.Count;
-
-            //the paths remaining in ComparePaths don't exist in our target and need to be removed during patching.
-            foreach (FileInfo file in ComparePaths)
-            {
-                //add del files                               replace root dir with patch base
-                string patchFilePath = file.FullName.Replace(CompareBase, PatchBase);
-                VFS.WriteFile($"{patchFilePath}.del", new byte[0]);
-
-                delCount++;
-                AdditionalInfo[2].ItemValue = delCount.ToString();
-
-                fileIt++;
-                RaiseProgressChanged(fileIt, fileCount, "", AdditionalInfo.ToArray());
-            }
-
-            return true;
-        }
-
-        public FileCompare(string TargetBase, string CompareBase, string PatchBase)
-        {
-            this.TargetBase = TargetBase;
-            this.CompareBase = CompareBase;
-            this.PatchBase = PatchBase;
-
-            fileCount = VFS.GetFilesCount(TargetBase);
-            fileIt = 0;
-        }
-    }
-}

Patcher/PatcherUtils/FilePatcher.cs

@@ -1,147 +0,0 @@
-using System;
-using System.IO;
-using Aki.Common.Utils;
-using Aki.ByteBanger;
-using System.Collections.Generic;
-using System.Linq;
-
-namespace PatcherUtils
-{
-    public class FilePatcher
-    {
-        public string TargetBase;
-        public string PatchBase;
-        private int fileCount;
-        private int fileIt;
-
-        private int diffCount;
-        private int newCount;
-        private int delCount;
-
-        private List<LineItem> AdditionalInfo;
-
-
-        public event ProgressChangedHandler ProgressChanged;
-
-        protected virtual void RaiseProgressChanged(int progress, int total, string Message = "", params LineItem[] AdditionalLineItems)
-        {
-            int percent = (int)Math.Floor((double)progress / total * 100);
-
-            ProgressChanged?.Invoke(this, progress, total, percent, Message, AdditionalLineItems);
-        }
-
-        public bool Patch(string targetfile, string patchfile)
-        {
-            byte[] target = VFS.ReadFile(targetfile);
-            byte[] patch = VFS.ReadFile(patchfile);
-
-            PatchResult result = PatchUtil.Patch(target, PatchInfo.FromBytes(patch));
-
-            switch (result.Result)
-            {
-                case PatchResultType.Success:
-                    VFS.WriteFile(targetfile, result.PatchedData);
-                    return true;
-
-                case PatchResultType.AlreadyPatched:
-                case PatchResultType.InputChecksumMismatch:
-                case PatchResultType.InputLengthMismatch:
-                    return true;
-
-                case PatchResultType.OutputChecksumMismatch:
-                default:
-                    return false;
-            }
-        }
-
-        private bool PatchAll(string targetpath, string patchpath)
-        {
-            DirectoryInfo di = new DirectoryInfo(patchpath);
-
-            foreach (FileInfo file in di.GetFiles())
-            {
-                FileInfo target = null;
-
-                switch (file.Extension)
-                {
-                    // patch
-                    case ".bpf":
-                        {
-                            target = new FileInfo(VFS.Combine(targetpath, file.Name.Replace(".bpf", "")));
-
-                            if (!Patch(target.FullName, file.FullName))
-                            {
-                                // patch failed
-                                return false;
-                            }
-
-                            diffCount--;
-                        }
-                        break;
-
-                    // add new files
-                    case ".new":
-                        {
-                            target = new FileInfo(VFS.Combine(targetpath, file.Name.Replace(".new", "")));
-                            VFS.WriteFile(target.FullName, Zlib.Decompress(VFS.ReadFile(file.FullName)));
-                            newCount--;
-                        }
-                        break;
-
-                    // delete old files
-                    case ".del":
-                        {
-                            target = new FileInfo(VFS.Combine(targetpath, file.Name.Replace(".del", "")));
-                            target.IsReadOnly = false;
-                            target.Delete();
-                            delCount--;
-                        }
-                        break;
-                }
-
-                AdditionalInfo[0].ItemValue = diffCount.ToString();
-                AdditionalInfo[1].ItemValue = newCount.ToString();
-                AdditionalInfo[2].ItemValue = delCount.ToString();
-
-                ++fileIt;
-                RaiseProgressChanged(fileIt, fileCount, target.Name, AdditionalInfo.ToArray());
-            }
-
-            foreach (DirectoryInfo directory in di.GetDirectories())
-            {
-                PatchAll(VFS.Combine(targetpath, directory.Name), directory.FullName);
-            }
-
-            di.Refresh();
-
-            if (di.GetFiles().Length == 0 && di.GetDirectories().Length == 0)
-            {
-                // remove empty folders
-                di.Delete();
-            }
-
-            return true;
-        }
-
-        public bool Run()
-        {
-            fileCount = VFS.GetFilesCount(PatchBase);
-
-            FileInfo[] files = new DirectoryInfo(PatchBase).GetFiles("*.*", SearchOption.AllDirectories);
-
-            diffCount = files.Where(x => x.Extension == ".bpf").Count();
-            newCount = files.Where(x => x.Extension == ".new").Count();
-            delCount = files.Where(x => x.Extension == ".del").Count();
-
-            AdditionalInfo = new List<LineItem>()
-            {
-                new LineItem("Patches Remaining", diffCount.ToString()),
-                new LineItem("New Files to Inflate", newCount.ToString()),
-                new LineItem("Files to Delete", delCount.ToString())
-            };
-
-            fileIt = 0;
-            return PatchAll(TargetBase, PatchBase);
-        }
-    }
-}

Patcher/PatcherUtils/LazyOperations.cs

@@ -12,12 +12,13 @@ namespace PatcherUtils
         /// </summary>
         public static string TempDir = "PATCHER_TEMP".FromCwd();
 
-        private static string SevenZExe = "7za.exe";
 
         /// <summary>
         /// The folder that the patches will be stored in
         /// </summary>
-        public static string PatchFolder = "Aki_Data\\Patcher";
+        public static string PatchFolder = "Aki_Patches";
+
+        private static string SevenZExe = "7za.exe";
 
         /// <summary>
         /// The path to the 7za.exe file in the <see cref="TempDir"/>
@@ -30,6 +31,13 @@ namespace PatcherUtils
         /// </summary>
         public static string PatcherClientPath = $"{TempDir}\\{PatcherClient}";
 
+        private static string XDelta3EXE = "xdelta3.exe";
+
+        /// <summary>
+        /// The path to the xdelta3.exe flie in the <see cref="TempDir"/>
+        /// </summary>
+        public static string XDelta3Path = $"{TempDir}\\{XDelta3EXE}";
+
         /// <summary>
         /// Streams embedded resources out of the assembly
         /// </summary>
@@ -73,6 +81,11 @@ namespace PatcherUtils
                             StreamResourceOut(resource, PatcherClientPath);
                             break;
                         }
+                    case string a when a.EndsWith(XDelta3EXE):
+                        {
+                            StreamResourceOut(resource, XDelta3Path);
+                            break;
+                        }
                 }
             }
         }

Patcher/PatcherUtils/PatchHelper.cs

@@ -0,0 +1,278 @@
+using Aki.Common.Utils;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+namespace PatcherUtils
+{
+    public class PatchHelper
+    {
+        private string SourceFolder = "";
+        private string TargetFolder = "";
+        private string DeltaFolder = "";
+
+        private int fileCountTotal;
+        private int filesProcessed;
+
+        private int deltaCount;
+        private int newCount;
+        private int delCount;
+
+        private List<LineItem> AdditionalInfo = new List<LineItem>();
+
+        public event ProgressChangedHandler ProgressChanged;
+
+        protected virtual void RaiseProgressChanged(int progress, int total, string Message = "", params LineItem[] AdditionalLineItems)
+        {
+            int percent = (int)Math.Floor((double)progress / total * 100);
+
+            ProgressChanged?.Invoke(this, progress, total, percent, Message, AdditionalLineItems);
+        }
+
+        public PatchHelper(string SourceFolder, string TargetFolder, string DeltaFolder)
+        {
+            this.SourceFolder = SourceFolder;
+            this.TargetFolder = TargetFolder;
+            this.DeltaFolder = DeltaFolder;
+        }
+
+        private string GetDeltaPath(string sourceFile, string sourceFolder, string extension)
+        {
+            return Path.Join(DeltaFolder, $"{sourceFile.Replace(sourceFolder, "")}.{extension}");
+        }
+
+        private void ApplyDelta(string SourceFilePath, string DeltaFilePath)
+        {
+            string decodedPath = SourceFilePath + ".decoded";
+
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = LazyOperations.XDelta3Path,
+                Arguments = $"-d -f -s \"{SourceFilePath}\" \"{DeltaFilePath}\" \"{decodedPath}\"",
+                CreateNoWindow = true
+            })
+            .WaitForExit();
+
+            if(File.Exists(decodedPath))
+            {
+                File.Delete(SourceFilePath);
+                File.Move(decodedPath, SourceFilePath);
+            }
+        }
+
+        private void CreateDelta(string SourceFilePath, string TargetFilePath)
+        {
+            FileInfo sourceFileInfo = new FileInfo(SourceFilePath);
+
+            string deltaPath = GetDeltaPath(SourceFilePath, SourceFolder, "delta");
+
+            Directory.CreateDirectory(deltaPath.Replace(sourceFileInfo.Name+".delta", ""));
+
+            //TODO - don't hardcode FileName
+
+            Process.Start(new ProcessStartInfo
+            {
+                FileName = LazyOperations.XDelta3Path,
+                Arguments = $"-0 -e -f -s \"{SourceFilePath}\" \"{TargetFilePath}\" \"{deltaPath}\"",
+                CreateNoWindow = true
+            })
+            .WaitForExit();
+        }
+
+        private void CreateDelFile(string SourceFile)
+        {
+            FileInfo sourceFileInfo = new FileInfo(SourceFile);
+
+            string deltaPath = GetDeltaPath(SourceFile, SourceFolder, "del");
+
+            Directory.CreateDirectory(deltaPath.Replace(sourceFileInfo.Name+".del", ""));
+
+            File.Create(deltaPath);
+        }
+
+        private void CreateNewFile(string TargetFile)
+        {
+            FileInfo targetSourceInfo = new FileInfo(TargetFile);
+
+            string deltaPath = GetDeltaPath(TargetFile, TargetFolder, "new");
+
+            Directory.CreateDirectory(deltaPath.Replace(targetSourceInfo.Name+".new", ""));
+
+            targetSourceInfo.CopyTo(deltaPath, true);
+        }
+
+        public bool GeneratePatches()
+        {
+            //get all directory information needed
+            DirectoryInfo sourceDir = new DirectoryInfo(SourceFolder);
+            DirectoryInfo targetDir = new DirectoryInfo(TargetFolder);
+            DirectoryInfo deltaDir = Directory.CreateDirectory(DeltaFolder);
+
+            //make sure all directories exist
+            if (!sourceDir.Exists || !targetDir.Exists || !deltaDir.Exists)
+            {
+                //One of the directories doesn't exist
+                return false;
+            }
+
+            List<FileInfo> SourceFiles = sourceDir.GetFiles("*", SearchOption.AllDirectories).ToList();
+
+            fileCountTotal = SourceFiles.Count;
+
+            AdditionalInfo.Clear();
+            AdditionalInfo.Add(new LineItem("Delta Patch", "0"));
+            AdditionalInfo.Add(new LineItem("New Patch", "0"));
+            AdditionalInfo.Add(new LineItem("Del Patch", "0"));
+
+            filesProcessed = 0;
+
+            RaiseProgressChanged(0, fileCountTotal, "Generating deltas...");
+
+            foreach (FileInfo targetFile in targetDir.GetFiles("*", SearchOption.AllDirectories))
+            {
+                //find a matching source file based on the relative path of the file
+                FileInfo sourceFile = SourceFiles.Find(f => f.FullName.Replace(sourceDir.FullName, "") == targetFile.FullName.Replace(targetDir.FullName, ""));
+
+                //if the target file doesn't exist in the source files, the target file needs to be added.
+                if (sourceFile == null)
+                {
+                    CreateNewFile(targetFile.FullName);
+
+                    newCount++;
+                    filesProcessed++;
+
+                    RaiseProgressChanged(filesProcessed, fileCountTotal, targetFile.Name, AdditionalInfo.ToArray());
+
+                    continue;
+                }
+
+                //if a matching source file was found, get the delta for it.
+                CreateDelta(sourceFile.FullName, targetFile.FullName);
+
+                SourceFiles.Remove(sourceFile);
+
+                deltaCount++;
+                filesProcessed++;
+
+                AdditionalInfo[0].ItemValue = deltaCount.ToString();
+                AdditionalInfo[1].ItemValue = newCount.ToString();
+
+                RaiseProgressChanged(filesProcessed, fileCountTotal, targetFile.Name, AdditionalInfo.ToArray());
+            }
+
+            //Any remaining source files do not exist in the target folder and can be removed.
+            //reset progress info
+            RaiseProgressChanged(0, SourceFiles.Count, "Processing .del files...");
+            filesProcessed = 0;
+            fileCountTotal = SourceFiles.Count;
+
+            foreach (FileInfo delFile in SourceFiles)
+            {
+                CreateDelFile(delFile.FullName);
+
+                delCount++;
+
+                AdditionalInfo[2].ItemValue = delCount.ToString();
+
+                filesProcessed++;
+                RaiseProgressChanged(filesProcessed, fileCountTotal, "", AdditionalInfo.ToArray());
+            }
+
+            return true;
+        }
+
+        public string ApplyPatches()
+        {
+            //get needed directory information
+            DirectoryInfo sourceDir = new DirectoryInfo(SourceFolder);
+            DirectoryInfo deltaDir = new DirectoryInfo(DeltaFolder);
+
+            //check directories exist
+            if (!sourceDir.Exists || !deltaDir.Exists)
+            {
+                return "One of the supplied directories doesn't exist";
+            }
+
+            List<FileInfo> SourceFiles = sourceDir.GetFiles("*", SearchOption.AllDirectories).ToList();
+
+            List<FileInfo> deltaFiles = deltaDir.GetFiles("*", SearchOption.AllDirectories).ToList();
+
+            deltaCount = deltaFiles.Where(x => x.Extension == ".delta").Count();
+            newCount = deltaFiles.Where(x => x.Extension == ".new").Count();
+            delCount = deltaFiles.Where(x => x.Extension == ".del").Count();
+
+
+            AdditionalInfo = new List<LineItem>()
+            {
+                new LineItem("Patches Remaining", deltaCount.ToString()),
+                new LineItem("New Files to Add", newCount.ToString()),
+                new LineItem("Files to Delete", delCount.ToString())
+            };
+
+            filesProcessed = 0;
+
+            fileCountTotal = deltaFiles.Count;
+
+            foreach (FileInfo deltaFile in deltaDir.GetFiles("*", SearchOption.AllDirectories))
+            {
+                switch(deltaFile.Extension)
+                {
+                    case ".delta":
+                        {
+                            //apply delta
+                            FileInfo sourceFile = SourceFiles.Find(f => f.FullName.Replace(sourceDir.FullName, "") == deltaFile.FullName.Replace(deltaDir.FullName, "").Replace(".delta", ""));
+
+                            if(sourceFile == null)
+                            {
+                                return $"Failed to find matching source file for '{deltaFile.FullName}'";
+                            }
+
+                            ApplyDelta(sourceFile.FullName, deltaFile.FullName);
+
+                            deltaCount--;
+
+                            break;
+                        }
+                    case ".new":
+                        {
+                            //copy new file
+                            string destination = Path.Join(sourceDir.FullName, deltaFile.FullName.Replace(deltaDir.FullName, "").Replace(".new", ""));
+
+                            File.Copy(deltaFile.FullName, destination);
+
+                            newCount--;
+
+                            break;
+                        }
+                    case ".del":
+                        {
+                            //remove unneeded file
+                            string delFilePath = Path.Join(sourceDir.FullName, deltaFile.FullName.Replace(deltaDir.FullName, "").Replace(".del", ""));
+
+                            File.Delete(delFilePath);
+
+                            delCount--;
+
+                            break;
+                        }
+                }
+
+                AdditionalInfo[0].ItemValue = deltaCount.ToString();
+                AdditionalInfo[1].ItemValue = newCount.ToString();
+                AdditionalInfo[2].ItemValue = delCount.ToString();
+
+                ++filesProcessed;
+                RaiseProgressChanged(filesProcessed, fileCountTotal, deltaFile.Name, AdditionalInfo.ToArray());
+            }
+
+            LazyOperations.CleanupTempDir();
+
+            Directory.Delete(LazyOperations.PatchFolder, true);
+
+            return $"Patching Complete. You can delete the patcher.exe file.";
+        }
+    }
+}

Patcher/PatcherUtils/PatcherUtils.csproj

@@ -7,23 +7,19 @@
   <ItemGroup>
     <None Remove="Resources\7za.exe" />
     <None Remove="Resources\PatchClient.exe" />
+    <None Remove="Resources\xdelta3.exe" />
   </ItemGroup>
 
   <ItemGroup>
     <EmbeddedResource Include="Resources\7za.exe" />
     <EmbeddedResource Include="Resources\PatchClient.exe" />
+    <EmbeddedResource Include="Resources\xdelta3.exe" />
   </ItemGroup>
 
   <ItemGroup>
-    <Reference Include="Aki.ByteBanger">
-      <HintPath>..\PatchGenerator\References\Aki.ByteBanger.dll</HintPath>
-    </Reference>
     <Reference Include="Aki.Common">
       <HintPath>..\PatchGenerator\References\Aki.Common.dll</HintPath>
     </Reference>
-    <Reference Include="ComponentAce.Compression.Libs.zlib">
-      <HintPath>..\PatchGenerator\References\ComponentAce.Compression.Libs.zlib.dll</HintPath>
-    </Reference>
   </ItemGroup>
 
 </Project>