[4sem] isaip01 done

4sem/isaip/01/PlayfairCypher/.gitignore

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+.idea/
+.vscode/
+.vs/
+
+bin/
+obj/
+
+*.user

4sem/isaip/01/PlayfairCypher/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="using:PlayfairCypher"
+             x:Class="PlayfairCypher.App">
+    <Application.DataTemplates>
+        <local:ViewLocator/>
+    </Application.DataTemplates>
+
+    <Application.Styles>
+        <FluentTheme Mode="Light"/>
+    </Application.Styles>
+</Application>

4sem/isaip/01/PlayfairCypher/App.axaml.cs

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+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+using PlayfairCypher.ViewModels;
+using PlayfairCypher.Views;
+
+namespace PlayfairCypher
+{
+    public class App : Application
+    {
+        public override void Initialize()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+
+        public override void OnFrameworkInitializationCompleted()
+        {
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+            {
+                desktop.MainWindow = new MainWindow
+                {
+                    DataContext = new MainWindowViewModel(),
+                };
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+    }
+}

4sem/isaip/01/PlayfairCypher/Models/PlayfairCrypto.cs

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+// ReSharper disable StringLiteralTypo
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace PlayfairCypher.Models {
+    public class PlayfairCrypto {
+        private static readonly HashSet<char> EnAlphabet = new("ABCDEFGHIKLMNOPQRSTUVWXYZ");
+    
+        public string Encrypt(string keyword, string text) {
+            var keyTable = GenerateTable(keyword);
+            var pairs = FormPairs(text);
+
+            var data = new StringBuilder(32);
+            
+            foreach (var pair in pairs) {
+                var idx1 = FindCharIndex(ref keyTable, pair[0]);
+                var idx2 = FindCharIndex(ref keyTable, pair[1]);
+
+                var x1 = idx1 / 5;  // x for rows
+                var y1 = idx1 % 5;  // and y for cols
+                var x2 = idx2 / 5;
+                var y2 = idx2 % 5;
+
+                char c1, c2;
+                if (y1 == y2) {
+                    c1 = keyTable[WrapIndex(x1 + 1), y1];
+                    c2 = keyTable[WrapIndex(x2 + 1), y1];
+                }
+                else if (x1 == x2) {
+                    c1 = keyTable[x1, WrapIndex(y1 + 1)];
+                    c2 = keyTable[x1, WrapIndex(y2 + 1)];
+                }
+                else {
+                    c1 = keyTable[x1, y2];
+                    c2 = keyTable[x2, y1];
+                }
+                
+                data.Append(c1).Append(c2);
+            }
+
+            return data.ToString();
+        }
+    
+        public string Decrypt(string keyword, string text) {
+            var keyTable = GenerateTable(keyword);
+            var pairs = FormPairs(text);
+
+            var data = new StringBuilder(32);
+            
+            foreach (var pair in pairs) {
+                var idx1 = FindCharIndex(ref keyTable, pair[0]);
+                var idx2 = FindCharIndex(ref keyTable, pair[1]);
+
+                var x1 = idx1 / 5;  // x for rows
+                var y1 = idx1 % 5;  // and y for cols
+                var x2 = idx2 / 5;
+                var y2 = idx2 % 5;
+
+                char c1, c2;
+                if (y1 == y2) {
+                    c1 = keyTable[WrapIndex(x1 - 1), y1];
+                    c2 = keyTable[WrapIndex(x2 - 1), y1];
+                }
+                else if (x1 == x2) {
+                    c1 = keyTable[x1, WrapIndex(y1 - 1)];
+                    c2 = keyTable[x1, WrapIndex(y2 - 1)];
+                }
+                else {
+                    c1 = keyTable[x1, y2];
+                    c2 = keyTable[x2, y1];
+                }
+                
+                data.Append(c1).Append(c2);
+            }
+
+            return data.ToString();
+        }
+
+        private char[,] GenerateTable(string keyword) {
+            char[,] table = new char[5,5];
+
+            keyword = ClearKeyword(keyword);
+            for (var i = 0; i < keyword.Length; i++) {
+                table[i / 5,i % 5] = keyword[i];
+            }
+
+            var kwcSet = new HashSet<char>(keyword);
+            var autoAlphabet = EnAlphabet.Except(kwcSet).ToList();
+            for (var i = keyword.Length; i < 25; i++) {
+                table[i / 5,i % 5] = autoAlphabet[i-keyword.Length];
+            }
+
+            return table;
+        }
+
+        private static string ClearKeyword(string keyword) {
+            string data = "";
+
+            keyword = keyword.Replace("J", "I");
+            foreach (var kwc in keyword) {
+                if (!EnAlphabet.Contains(kwc) || kwc == ' ' || data.Contains(kwc)) {
+                    continue;
+                }
+
+                data += kwc;
+            }
+
+            return data;
+        }
+
+        private static int FindCharIndex(ref char[,] table, char c) {
+            for (var i = 0; i < 25; i++) {
+                if (table[i / 5, i % 5] == c) {
+                    return i;
+                }
+            }
+
+            throw new ArgumentOutOfRangeException($"Character '{c}' not fount in table");
+        }
+
+        private static List<string> FormPairs(string text) {
+            List<string> data = new ();
+
+            text = text.Replace("J", "I");
+            var cc = text[0];
+            for (var i = 1; i < text.Length; i++) {
+                if (cc != '\0' && !EnAlphabet.Contains(cc)) {
+                    cc = '\0';
+                }
+                if (cc == '\0') {
+                    cc = text[i];
+                }
+                else if (cc == text[i]) {
+                    data.Add("" + cc + "X");
+                    cc = text[i];
+                }
+                else {
+                    data.Add("" + cc + text[i]);
+                    cc = '\0';
+                }
+            }
+
+            if (cc != '\0') {
+                data.Add("" + cc + "X");
+            }
+            
+            return data;
+        }
+
+        private static int WrapIndex(int idx) {
+            if (idx < 0) {
+                idx += 5;
+            }
+
+            return idx % 5;
+        }
+    }
+}

4sem/isaip/01/PlayfairCypher/PlayfairCypher.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net5.0</TargetFramework>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+    <ItemGroup>
+        <Folder Include="Models\" />
+        <AvaloniaResource Include="Assets\**" />
+    </ItemGroup>
+    <ItemGroup>
+        <PackageReference Include="Avalonia" Version="0.10.0" />
+        <PackageReference Include="Avalonia.Desktop" Version="0.10.0" />
+        <PackageReference Include="Avalonia.Diagnostics" Version="0.10.0" />
+        <PackageReference Include="Avalonia.ReactiveUI" Version="0.10.0" />
+    </ItemGroup>
+</Project>

4sem/isaip/01/PlayfairCypher/PlayfairCypher.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PlayfairCypher", "PlayfairCypher.csproj", "{5AAEBCD9-0ADD-4C76-B1B4-92569D82970B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5AAEBCD9-0ADD-4C76-B1B4-92569D82970B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5AAEBCD9-0ADD-4C76-B1B4-92569D82970B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5AAEBCD9-0ADD-4C76-B1B4-92569D82970B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5AAEBCD9-0ADD-4C76-B1B4-92569D82970B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

4sem/isaip/01/PlayfairCypher/Program.cs

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+using Avalonia;
+using Avalonia.ReactiveUI;
+
+namespace PlayfairCypher {
+    internal static class Program {
+        public static void Main(string[] args) {
+            BuildAvaloniaApp().StartWithClassicDesktopLifetime(args);
+        }
+
+        private static AppBuilder BuildAvaloniaApp() {
+            return AppBuilder.Configure<App>().UsePlatformDetect().LogToTrace().UseReactiveUI();
+        }
+    }
+}

4sem/isaip/01/PlayfairCypher/ViewLocator.cs

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+using System;
+using Avalonia.Controls;
+using Avalonia.Controls.Templates;
+using PlayfairCypher.ViewModels;
+using ReactiveUI;
+
+namespace PlayfairCypher
+{
+    public class ViewLocator : IDataTemplate
+    {
+        public bool SupportsRecycling => false;
+
+        public IControl Build(object data)
+        {
+            var name = data.GetType().FullName!.Replace("ViewModel", "View");
+            var type = Type.GetType(name);
+
+            if (type != null)
+            {
+                return (Control) Activator.CreateInstance(type)!;
+            }
+            else
+            {
+                return new TextBlock {Text = "Not Found: " + name};
+            }
+        }
+
+        public bool Match(object data)
+        {
+            return data is ReactiveObject;
+        }
+    }
+}

4sem/isaip/01/PlayfairCypher/ViewModels/MainWindowViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Reactive.Disposables;
+using System.Text;
+using Avalonia.Controls;
+using PlayfairCypher.Models;
+using ReactiveUI;
+
+namespace PlayfairCypher.ViewModels {
+    public class MainWindowViewModel : ReactiveObject {
+        private string _keyword = "";
+        private string _inputText = "";
+        private string _outputText = "";
+        private bool _isEncrypting = true;
+
+        private readonly PlayfairCrypto _cryptor;
+
+        public MainWindowViewModel() {
+            _cryptor = new PlayfairCrypto();
+        }
+
+        public string Keyword {
+            get => _keyword;
+            set {
+                this.RaiseAndSetIfChanged(ref _keyword, value.ToUpper());
+                CalculateCypher();
+            }
+        }
+
+        public string InputText {
+            get => _inputText;
+            set {
+                this.RaiseAndSetIfChanged(ref _inputText, value.ToUpper());
+                CalculateCypher();
+            }
+        }
+
+        public string OutputText {
+            get => _outputText;
+            set => this.RaiseAndSetIfChanged(ref _outputText, value.ToUpper());
+        }
+
+        public bool IsEncrypting {
+            get => _isEncrypting;
+            set {
+                this.RaiseAndSetIfChanged(ref _isEncrypting, value);
+                InputText = OutputText;
+            }
+        }
+
+        public void ClearForm() {
+            InputText = "";
+            Keyword = "";
+        }
+
+        void CalculateCypher() {
+            if (InputText.Length == 0) {
+                OutputText = "";
+                return;
+            }
+            if (Keyword.Length == 0) {
+                OutputText = "Error: Keyword is empty";
+                return;
+            }
+
+            OutputText = IsEncrypting? _cryptor.Encrypt(Keyword.Trim(), InputText.Trim()) : _cryptor.Decrypt(Keyword.Trim(), InputText.Trim());
+        }
+    }
+}

4sem/isaip/01/PlayfairCypher/Views/MainWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:PlayfairCypher.ViewModels"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+        Width="700" Height="300"
+        x:Class="PlayfairCypher.Views.MainWindow"
+        Icon="/Assets/avalonia-logo.ico"
+        Title="PlayfairCypher">
+
+    <Design.DataContext>
+        <vm:MainWindowViewModel/>
+    </Design.DataContext>
+    
+    <Grid RowDefinitions="Auto,20,*" Margin="20">
+        <Grid Grid.Row="0" ColumnDefinitions="*,40,Auto,Auto,Auto">
+            <TextBox Grid.Column="0" AcceptsReturn="True" ScrollViewer.VerticalScrollBarVisibility="Auto" Watermark="Keyword" NewLine=""
+                     Text="{Binding Keyword}"/>
+            <CheckBox Grid.Column="2" Content="Encrypting" IsChecked="{Binding IsEncrypting}" />
+            <Button Grid.Column="4" Content="Clear form" Command="{Binding ClearForm}" />
+        </Grid>
+        <Grid Grid.Row="2" ColumnDefinitions="*,Auto,*">
+            <TextBox Grid.Column="0" AcceptsReturn="True" ScrollViewer.VerticalScrollBarVisibility="Auto" 
+                     Watermark="INPUT" UseFloatingWatermark="True" TextWrapping="Wrap"
+                     Text="{Binding InputText}"/>
+            <GridSplitter Grid.Column="1" />
+            <TextBox Grid.Column="2" ScrollViewer.VerticalScrollBarVisibility="Auto" IsReadOnly="True"
+                     Watermark="OUTPUT" UseFloatingWatermark="True" TextWrapping="Wrap"
+                     Text="{Binding OutputText}"/>
+        </Grid>
+    </Grid>
+</Window>

4sem/isaip/01/PlayfairCypher/Views/MainWindow.axaml.cs

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+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace PlayfairCypher.Views {
+    public class MainWindow : Window {
+        public MainWindow() {
+            InitializeComponent();
+#if DEBUG
+            this.AttachDevTools();
+#endif
+        }
+
+        private void InitializeComponent() {
+            AvaloniaXamlLoader.Load(this);
+        }
+    }
+}