fuck idk like all kinds of stuff...

Patcher/Patcher.sln

@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.31515.178
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PatchGenerator", "Patcher\PatchGenerator.csproj", "{DDB70566-994E-4884-8555-C005B238039B}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PatcherUtils", "PatcherUtils\PatcherUtils.csproj", "{A9819B34-8111-4344-B2B3-3DE5D7A43A45}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{DDB70566-994E-4884-8555-C005B238039B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DDB70566-994E-4884-8555-C005B238039B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DDB70566-994E-4884-8555-C005B238039B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DDB70566-994E-4884-8555-C005B238039B}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A9819B34-8111-4344-B2B3-3DE5D7A43A45}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A9819B34-8111-4344-B2B3-3DE5D7A43A45}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A9819B34-8111-4344-B2B3-3DE5D7A43A45}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A9819B34-8111-4344-B2B3-3DE5D7A43A45}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A9AA1062-33C6-49F2-880C-067D44041C4A}
+	EndGlobalSection
+EndGlobal

Patcher/Patcher/App.xaml

@@ -0,0 +1,9 @@
+<Application x:Class="PatchGenerator.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="clr-namespace:PatchGenerator"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+         
+    </Application.Resources>
+</Application>

Patcher/Patcher/App.xaml.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace PatchGenerator
+{
+    /// <summary>
+    /// Interaction logic for App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+    }
+}

Patcher/Patcher/AssemblyInfo.cs

@@ -0,0 +1,10 @@
+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

Patcher/Patcher/MainWindow.xaml

@@ -0,0 +1,71 @@
+<Window x:Class="PatchGenerator.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:PatchGenerator"
+        mc:Ignorable="d"
+        Title="MainWindow" Height="450" Width="800">
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="*"/>
+            <ColumnDefinition Width="*"/>
+            <ColumnDefinition Width="AUTO"/>
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="AUTO"/>
+            <RowDefinition Height="*"/>
+            <RowDefinition Height="AUTO"/>
+        </Grid.RowDefinitions>
+
+        <ProgressBar x:Name="GenProgressBar" 
+                     Grid.ColumnSpan="2"
+                     Height="20" Margin="10"
+                     Foreground="MediumPurple"
+                     />
+
+        <Label x:Name="GenProgressMessageLabel"
+               FontSize="15" FontWeight="SemiBold"
+               Grid.ColumnSpan="2" Margin="0 0 10 0"
+               HorizontalAlignment="Right" VerticalAlignment="Center" 
+               />
+
+        <Label x:Name="GenProgressInfoLabel"
+               FontSize="15" FontWeight="SemiBold"
+               Grid.ColumnSpan="2" Margin="10 0 0 0"
+               HorizontalAlignment="Left" VerticalAlignment="Center"
+               />
+
+        <Label x:Name="CompareLabel" 
+               Grid.Row="1" Margin="10 10 5 10"
+               Drop="CompareLabel_Drop"
+               AllowDrop="True"
+               HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
+               HorizontalContentAlignment="Center" VerticalContentAlignment="Center"
+               Content="Drag and drop COMPARE folder here"
+               BorderBrush="Gainsboro" BorderThickness="2"
+               />
+        
+        <Label x:Name="TargetLabel" 
+               Grid.Column="1" Grid.Row="1" Margin="5 10 10 10"
+               Drop="TargetLabel_Drop"
+               AllowDrop="True"
+               HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
+               HorizontalContentAlignment="Center" VerticalContentAlignment="Center"
+               Content="Drag and drop TARGET folder here"
+               BorderBrush="Gainsboro" BorderThickness="2"
+               />
+
+        <TextBlock x:Name="AdditionalInfoBlock"
+                   Grid.Row="2" Margin="10"
+                   TextWrapping="Wrap"
+                   />
+
+        <Button x:Name="GenButton" 
+                Grid.Column="1" Grid.Row="2" 
+                MinHeight="40" Margin="10"
+                Content="Generate Patches"
+                Click="GenButton_Click"
+                />
+    </Grid>
+</Window>

Patcher/Patcher/MainWindow.xaml.cs

@@ -0,0 +1,173 @@
+using System.Diagnostics;
+using System.IO;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Media;
+using PatcherUtils;
+
+namespace PatchGenerator
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        private string compareFolder = "";
+        private string targetFolder = "";
+        private readonly string patchFolder = "Aki_Data/Patcher/".FromCwd();
+        private Stopwatch stopwatch = new Stopwatch();
+
+        public MainWindow()
+        {
+            InitializeComponent();
+        }
+
+        private string GetStopWatchTime()
+        {
+            return $"Hours: {stopwatch.Elapsed.Hours} - Mins: {stopwatch.Elapsed.Minutes} - Secs: {stopwatch.Elapsed.Seconds} - MilliSecs: {stopwatch.Elapsed.Milliseconds}";
+        }
+
+        private static bool FileDropCheck(DragEventArgs args, ref string str)
+        {
+            if (!args.Data.GetDataPresent(DataFormats.FileDrop))
+            {
+                return false;
+            }
+
+            string[] paths = (string[])args.Data.GetData(DataFormats.FileDrop);
+
+            if (paths.Length != 1) return false;
+
+            if (!Directory.Exists(paths[0]))
+            {
+                return false;
+            }
+
+            str = paths[0];
+
+            return true;
+        }
+
+        private void CompareLabel_Drop(object sender, DragEventArgs e)
+        {
+            if (FileDropCheck(e, ref compareFolder))
+            { 
+                CompareLabel.Content = $"Compare Folder:\n{compareFolder}";
+                CompareLabel.BorderBrush = Brushes.DarkCyan;
+            }
+            else
+            {
+                MessageBox.Show("Dropped File/s could not be used. Make sure you only drop one folder.");
+            }
+        }
+
+        private void TargetLabel_Drop(object sender, DragEventArgs e)
+        {
+            if(FileDropCheck(e, ref targetFolder))
+            {
+                TargetLabel.Content = $"Target Folder:\n{targetFolder}";
+                TargetLabel.BorderBrush = Brushes.DarkCyan;
+            }
+            else 
+            {
+                MessageBox.Show("Dropped File/s could not be used. Make sure you only drop one folder.");
+            }
+        }
+
+        private void GeneratePatches()
+        {
+            //create temp data
+            Application.Current.Dispatcher.Invoke(() =>
+            {
+                GenProgressBar.IsIndeterminate = true;
+                GenProgressMessageLabel.Content = "Extracting temp data ...";
+            });
+
+            LazyOperations.PrepTempDir();
+
+            Application.Current.Dispatcher.Invoke(() =>
+            {
+                GenProgressBar.IsIndeterminate = false;
+            });
+
+
+            //generate patches
+            
+            FileCompare bc = new FileCompare(targetFolder, compareFolder, patchFolder);
+
+            bc.ProgressChanged += Bc_ProgressChanged;
+
+            if (!bc.CompareAll())
+            {
+                MessageBox.Show("Failed to generate diffs.", ":(", MessageBoxButton.OK, MessageBoxImage.Error);
+            }
+
+            //TODO - Build patcher
+
+            //TODO - compress to file (should add a name textbox or something)
+
+            //Cleanup temp data
+            Application.Current.Dispatcher.Invoke(() =>
+            {
+                GenProgressBar.Value = 100;
+                GenProgressMessageLabel.Content = $"Done";
+            });
+
+            if (!LazyOperations.CleanupTempDir()) 
+            {
+                MessageBox.Show($"Looks like some temp files could not be removed. You can safely delete this folder:\n\n{LazyOperations.TempDir}");
+            }
+        }
+
+        private void Bc_ProgressChanged(object Sender, int Progress, int Total, int Percent, string Message = "", params LineItem[] AdditionalLineItems)
+        {
+
+            string additionalInfo = "";
+            foreach(LineItem item in AdditionalLineItems)
+            {
+                additionalInfo += $"{item.ItemText}: {item.ItemValue}\n";
+            }
+
+            Application.Current.Dispatcher.Invoke(() =>
+            {
+                GenProgressBar.Value = Percent;
+
+                if (!string.IsNullOrWhiteSpace(Message))
+                {
+                    GenProgressMessageLabel.Content = Message;
+                }
+
+                GenProgressInfoLabel.Content = $"[{Progress}/{Total}]";
+
+                AdditionalInfoBlock.Text = additionalInfo;
+            });
+        }
+
+        private void GenButton_Click(object sender, RoutedEventArgs e)
+        {
+            GenButton.IsEnabled = false;
+
+            Task.Run(() =>
+            {
+                stopwatch.Reset();
+                stopwatch.Start();
+
+                try
+                {
+                    GeneratePatches();
+                }
+                finally
+                {
+                    stopwatch.Stop();
+
+                    Application.Current.Dispatcher.Invoke(() =>
+                    {
+                        GenButton.IsEnabled = true;
+                        GenProgressMessageLabel.Content = "";
+                        GenProgressInfoLabel.Content = $"Patches Generated in: {GetStopWatchTime()}";
+                    });
+                }
+            });
+        }
+    }
+}

Patcher/Patcher/PatchGenerator.csproj

@@ -0,0 +1,33 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net5.0-windows</TargetFramework>
+    <UseWPF>true</UseWPF>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Remove="Resources\7za.exe" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Include="Resources\7za.exe" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\PatcherUtils\PatcherUtils.csproj" />
+  </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

@@ -0,0 +1,185 @@
+// 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, "", 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

@@ -0,0 +1,149 @@
+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);
+
+            RaiseProgressChanged(0, fileCount, "Patching client...");
+
+            foreach (FileInfo file in di.GetFiles())
+            {
+                FileInfo target;
+
+                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, "", 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

@@ -0,0 +1,95 @@
+using System.IO;
+using System.Reflection;
+
+namespace PatcherUtils
+{
+    public class LazyOperations
+    {
+        /// <summary>
+        /// A directory to store temporary data.
+        /// </summary>
+        public static string TempDir = "PATCHER_TEMP".FromCwd();
+
+        private static string SevenZExe = "7za.exe";
+        /// <summary>
+        /// The path to the 7za.exe file in the <see cref="TempDir"/>
+        /// </summary>
+        public static string SevenZExePath = $"{TempDir}\\{SevenZExe}";
+
+        private static string PatcherClient = "patcher.exe";
+        /// <summary>
+        /// The path to the patcher.exe file in the <see cref="TempDir"/>
+        /// </summary>
+        public static string PatcherClientPath = $"{TempDir}\\{PatcherClient}";
+
+        /// <summary>
+        /// Streams embedded resources out of the assembly
+        /// </summary>
+        /// <param name="ResourceName"></param>
+        /// <param name="OutputFilePath"></param>
+        /// <remarks>The resource will not be streamed out if the <paramref name="OutputFilePath"/> already exists</remarks>
+        private static void StreamResourceOut(string ResourceName, string OutputFilePath)
+        {
+            FileInfo outputFile = new FileInfo(OutputFilePath);
+
+            if (outputFile.Exists) return;
+
+            if (!outputFile.Directory.Exists)
+            {
+                Directory.CreateDirectory(outputFile.Directory.FullName);
+            }
+
+            using (FileStream fs = File.Create(OutputFilePath))
+            using (Stream s = Assembly.GetExecutingAssembly().GetManifestResourceStream(ResourceName))
+            {
+                s.CopyTo(fs);
+            }
+        }
+
+        /// <summary>
+        /// Checks the resources in the assembly and streams them to the temp directory for later use.
+        /// </summary>
+        public static void PrepTempDir()
+        {
+            foreach(string resource in Assembly.GetExecutingAssembly().GetManifestResourceNames())
+            {
+                switch(resource)
+                {
+                    case string a when a.EndsWith(SevenZExe):
+                        {
+                            StreamResourceOut(resource, SevenZExePath);
+                            break;
+                        }
+                    case string a when a.EndsWith(PatcherClient):
+                        {
+                            StreamResourceOut(resource, PatcherClientPath);
+                            break;
+                        }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Deletes the <see cref="TempDir"/> recursively
+        /// </summary>
+        /// <Returns>Returns true if the temp directory was deleted.</Returns>
+        public static bool CleanupTempDir()
+        {
+            DirectoryInfo dir = new DirectoryInfo(TempDir);
+
+            if(dir.Exists)
+            {
+                dir.Delete(true);
+            }
+
+            dir.Refresh();
+
+            if(dir.Exists)
+            {
+                return false;
+            }
+
+            return true;
+        }
+    }
+}

Patcher/PatcherUtils/LineItem.cs

@@ -0,0 +1,15 @@
+namespace PatcherUtils
+{
+    public class LineItem
+    {
+        public string ItemText;
+        public string ItemValue;
+        public bool HasValue => ItemValue != "";
+
+        public LineItem(string ItemText, string ItemValue = "")
+        {
+            this.ItemText = ItemText;
+            this.ItemValue = ItemValue;
+        }
+    }
+}

Patcher/PatcherUtils/PatcherUtils.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Reference Include="Aki.ByteBanger">
+      <HintPath>..\Patcher\References\Aki.ByteBanger.dll</HintPath>
+    </Reference>
+    <Reference Include="Aki.Common">
+      <HintPath>..\Patcher\References\Aki.Common.dll</HintPath>
+    </Reference>
+    <Reference Include="ComponentAce.Compression.Libs.zlib">
+      <HintPath>..\Patcher\References\ComponentAce.Compression.Libs.zlib.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+
+</Project>

Patcher/PatcherUtils/ProgressChangedHandler.cs

@@ -0,0 +1,13 @@
+namespace PatcherUtils
+{
+    /// <summary>
+    /// <see cref="WriteProgressHandler(object, int, int, int, string, string[])"/> delegate
+    /// </summary>
+    /// <param name="Sender">The object calling the handler</param>
+    /// <param name="Progress">The current number of items processed</param>
+    /// <param name="Total">The total number of items</param>
+    /// <param name="Percent">The percentage of items processed</param>
+    /// <param name="Message">An optional message to display above the progress bar</param>
+    /// <param name="AdditionalLineItems">Additional information to display below the progress bar.</param>
+    public delegate void ProgressChangedHandler(object Sender, int Progress, int Total, int Percent, string Message = "", params LineItem[] AdditionalLineItems);
+}

Patcher/PatcherUtils/RandomExtensions.cs

@@ -0,0 +1,13 @@
+using System;
+using System.IO;
+
+namespace PatcherUtils
+{
+    public static class RandomExtensions
+    {
+        public static string FromCwd(this string s)
+        {
+            return Path.Combine(Environment.CurrentDirectory, s);
+        }
+    }
+}