its downloading!!!

.gitignore

@@ -17,6 +17,7 @@
 .idea/
 .editorconfig
 *.user
+*.DotSettings
 
 #backups
 .old*/

nuget.config

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<configuration>
-    <packageSources>
-        <!-- avalonia nightly feed -->
-        <add key="avalonia-nightly" value="https://nuget-feed-nightly.avaloniaui.net/v3/index.json" protocolVersion="3" />
-    </packageSources>
-</configuration>

Млаумчерб.Клиент/LZMACompressor.cs

@@ -0,0 +1,26 @@
+namespace Млаумчерб.Клиент;
+
+/// <summary>
+/// https://gist.github.com/ststeiger/cb9750664952f775a341
+/// </summary>
+public static class LZMACompressor
+{
+    public static void Decompress(Stream inputStream, Stream outputStream)
+    {
+        var decoder = new SevenZip.Compression.LZMA.Decoder();
+        var properties = new byte[5];
+        // Read decoder properties
+        if (inputStream.Read(properties, 0, 5) != 5)
+            throw new Exception("lzma stream is too short");
+        decoder.SetDecoderProperties(properties);
+        
+        // Read decompressed data size
+        var fileLengthBytes = new byte[8];
+        if(inputStream.Read(fileLengthBytes, 0, 8) != 8)
+            throw new Exception("lzma stream is too short");
+        long fileLength = BitConverter.ToInt64(fileLengthBytes, 0);
+        
+        // Decode
+        decoder.Code(inputStream, outputStream, -1, fileLength, null);
+    }
+}

Млаумчерб.Клиент/Главне.cs

@@ -6,6 +6,7 @@ global using System.Text;
 global using System.Threading;
 global using System.Threading.Tasks;
 global using Newtonsoft.Json;
+global using DTLib;
 global using DTLib.Logging;
 global using DTLib.Filesystem;
 global using File = DTLib.Filesystem.File;
@@ -13,7 +14,7 @@ global using Directory = DTLib.Filesystem.Directory;
 global using Path = DTLib.Filesystem.Path;
 using System.Globalization;
 using Avalonia;
-using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.зримое;
 
 namespace Млаумчерб.Клиент;
 

Млаумчерб.Клиент/Игра.cs

@@ -1,6 +1,7 @@
-using CliWrap;
+using System.Linq;
+using CliWrap;
 using DTLib.Extensions;
-using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.зримое;
 using Млаумчерб.Клиент.классы;
 using Млаумчерб.Клиент.сеть;
 using Млаумчерб.Клиент.сеть.NetworkTaskFactories;
@@ -25,15 +26,24 @@ public class GameVersion
 
     public static async Task<List<GameVersionProps>> GetAllVersionsAsync()
     {
-        var propsList = new List<GameVersionProps>();
+        var propsSet = new HashSet<GameVersionProps>();
-        foreach (IOPath f in Directory.GetFiles(GetVersionDescriptorDir()))
+        
+        // local descriptors
+        foreach (IOPath f in Directory.GetFiles(GetVersionDescriptorsDir()))
         {
             string name = GetVersionDescriptorName(f);
-            propsList.Add(new GameVersionProps(name, null, f));
+            propsSet.Add(new GameVersionProps(name, null, f));
         }
-
+        
-        var remoteVersions = await Сеть.GetDownloadableVersions();
+        // remote non-duplicating versions
-        propsList.AddRange(remoteVersions);
+        foreach (var removeVersion in await Сеть.GetDownloadableVersions())
+        {
+           propsSet.Add(removeVersion);
+        }
+        
+        // reverse sort
+        var propsList = propsSet.ToList();
+        propsList.Sort((a, b) => b.CompareTo(a));
         return propsList;
     }
 
@@ -44,7 +54,7 @@ public class GameVersion
             if (props.RemoteDescriptorUrl is null)
                 throw new NullReferenceException("can't download game version descriptor '"
                                                  + props.Name + "', because RemoteDescriptorUrl is null");
-            await Сеть.DownloadFileHTTP(props.RemoteDescriptorUrl, props.LocalDescriptorPath);
+            await Сеть.DownloadFile(props.RemoteDescriptorUrl, props.LocalDescriptorPath);
         }
 
         return new GameVersion(props);
@@ -63,44 +73,44 @@ public class GameVersion
         JavaExecutableFilePath = GetJavaExecutablePath(descriptor.javaVersion.component);
     }
 
-    public async Task<List<NetworkTask>> CreateUpdateTasksAsync(bool checkHashes)
+    public async Task UpdateFiles(bool checkHashes, Action<NetworkTask> networkTaskCreatedCallback)
     {
+        Приложение.Логгер.LogInfo(nameof(GameVersion), $"started updating version {Name}");
+        
         List<INetworkTaskFactory> taskFactories =
         [
             new AssetsDownloadTaskFactory(descriptor),
             new LibrariesDownloadTaskFactory(descriptor, libraries),
             new VersionFileDownloadTaskFactory(descriptor),
         ];
-        /*if(Приложение.Настройки.скачать_жабу)
+        if(Приложение.Настройки.скачивать_жабу)
         {
             taskFactories.Add(new JavaDownloadTaskFactory(descriptor));
-        }*/
+        }
+        //TODO: modpack
         /*if (modpack != null)
         {
             taskFactories.Add(new ModpackDownloadTaskFactory(modpack));
         }*/
         
-        List<NetworkTask> tasks = new();
+        var networkTasks = new List<NetworkTask>();
         for (int i = 0; i < taskFactories.Count; i++)
         {
             var nt = await taskFactories[i].CreateAsync(checkHashes);
-            if (nt != null) 
+            if (nt != null)
-                tasks.Add(nt);
+            {
+                networkTasks.Add(nt);
+                networkTaskCreatedCallback.Invoke(nt);
+            }
         }
 
-        if (tasks.Count == 0)
+        foreach (var nt in networkTasks)
         {
-            _props.IsDownloaded = true;
+            await nt.StartAsync();
         }
-        else
+        
-        {
+        _props.IsDownloaded = true;
-            tasks[^1].OnStop += status =>
+        Приложение.Логгер.LogInfo(nameof(GameVersion), $"finished updating version {Name}");
-            {
-                if (status == NetworkTask.Status.Completed)
-                    _props.IsDownloaded = true;
-            };
-        }
-        return tasks;
     }
 
     public async Task Launch()

Млаумчерб.Клиент/Логи.cs

@@ -24,7 +24,9 @@ public class LauncherLogger : ILogger
 #endif
     }
 
-    public delegate void LogHandler(string context, LogSeverity severity, object message, ILogFormat format);
+    public record LogMessage(string context, LogSeverity severity, object message, ILogFormat format);
+
+    public delegate void LogHandler(LogMessage msg);
     public event LogHandler? OnLogMessage;
     
     public void Log(string context, LogSeverity severity, object message, ILogFormat format)
@@ -39,7 +41,7 @@ public class LauncherLogger : ILogger
             _ => throw new ArgumentOutOfRangeException(nameof(severity), severity, null)
         };
         if(isEnabled)
-            OnLogMessage?.Invoke(context, severity, message, format);
+            OnLogMessage?.Invoke(new(context, severity, message, format));
     }
     
     public void Dispose()

Млаумчерб.Клиент/Млаумчерб.Клиент.csproj

@@ -16,16 +16,16 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Avalonia" Version="11.*" />
+        <PackageReference Include="Avalonia" Version="11.2.0" />
-        <PackageReference Include="Avalonia.Desktop" Version="11.*" />
+        <PackageReference Include="Avalonia.Desktop" Version="11.2.0" />
-        <PackageReference Include="Avalonia.Themes.Simple" Version="11.*" />
+        <PackageReference Include="Avalonia.Themes.Simple" Version="11.2.0" />
-        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.*" />
+        <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.2.0" />
-        <PackageReference Include="Avalonia.Labs.Gif" Version="11.2.999-cibuild-00051673"/>
+        <PackageReference Include="Avalonia.Labs.Gif" Version="11.2.0" />
-        <PackageReference Include="CliWrap" Version="3.6.*" />
+        <PackageReference Include="CliWrap" Version="3.6.7" />
-        <PackageReference Include="DTLib" Version="1.4.3" />
+        <PackageReference Include="DTLib" Version="1.6.1" />
-        <PackageReference Include="MessageBox.Avalonia" Version="3.1.*" />
+        <PackageReference Include="LZMA-SDK" Version="22.1.1" />
+        <PackageReference Include="MessageBox.Avalonia" Version="3.2.0" />
         <PackageReference Include="Newtonsoft.Json" Version="13.*" />
-        <PackageReference Include="EasyCompressor.LZMA" Version="2.0.2" />
     </ItemGroup>
 
     <ItemGroup>
@@ -33,15 +33,15 @@
     </ItemGroup>
 
     <ItemGroup>
-      <Compile Update="видимое\VersionItemView.axaml.cs">
+      <Compile Update="зримое\VersionItemView.axaml.cs">
         <DependentUpon>VersionItemView.axaml</DependentUpon>
         <SubType>Code</SubType>
       </Compile>
-      <Compile Update="видимое\Окне.axaml.cs">
+      <Compile Update="зримое\Окне.axaml.cs">
         <DependentUpon>Окне.axaml</DependentUpon>
         <SubType>Code</SubType>
       </Compile>
-      <Compile Update="видимое\Приложение.axaml.cs">
+      <Compile Update="зримое\Приложение.axaml.cs">
         <DependentUpon>Приложение.axaml</DependentUpon>
         <SubType>Code</SubType>
       </Compile>

Млаумчерб.Клиент/Настройки.cs

@@ -1,5 +1,4 @@
-using DTLib.Extensions;
+using Млаумчерб.Клиент.зримое;
-using Млаумчерб.Клиент.видимое;
 
 namespace Млаумчерб.Клиент;
 
@@ -7,12 +6,11 @@ public record Настройки
 {
     public string имя_пользователя { get; set; } = "";
     public int выделенная_память_мб { get; set; } = 4096;
-    public bool открывать_на_весь_экран { get; set; }
     public string путь_к_кубачу { get; set; } = ".";
-    public bool скачать_жабу { get; set; } = true;
+    public bool запускать_полноэкранное { get; set; } = false;
+    public bool скачивать_жабу { get; set; } = true;
     public string? последняя_запущенная_версия { get; set; }
-    
+    public int максимум_параллельных_загрузок { get; set; } = 16;
-    [JsonIgnore] private Stream? fileWriteStream; 
     
     public static Настройки ЗагрузитьИзФайла(string имя_файла = "млаумчерб.настройки")
     {
@@ -43,10 +41,8 @@ public record Настройки
     {
         //TODO: file backup and restore
         Приложение.Логгер.LogDebug(nameof(Настройки), $"настройки сохраняются в файл '{имя_файла}'");
-        fileWriteStream ??= File.OpenWrite(имя_файла);
         var текст = JsonConvert.SerializeObject(this, Formatting.Indented);
-        fileWriteStream.Seek(0, SeekOrigin.Begin);
+        File.WriteAllText(имя_файла, текст);
-        fileWriteStream.FluentWriteString(текст).Flush();
         Приложение.Логгер.LogDebug(nameof(Настройки), $"настройки сохранены: {текст}");
     }
 }

Млаумчерб.Клиент/Ошибки.cs

@@ -4,7 +4,7 @@ using MsBox.Avalonia;
 using MsBox.Avalonia.Dto;
 using MsBox.Avalonia.Enums;
 using MsBox.Avalonia.Models;
-using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.зримое;
 
 namespace Млаумчерб.Клиент;
 

Млаумчерб.Клиент/видимое/DownloadItemView.axaml

@@ -1,20 +0,0 @@
-<UserControl xmlns="https://github.com/avaloniaui"
-             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             x:Class="Млаумчерб.Клиент.видимое.DownloadTaskView"
-             Padding="4" MaxHeight="60" MinWidth="200"
-             VerticalAlignment="Top"
-             HorizontalAlignment="Stretch"
-             BorderThickness="1" BorderBrush="#999999">
-    <Grid RowDefinitions="30 30" ColumnDefinitions="* 30">
-        <TextBlock Grid.Row="0" Grid.Column="0" Name="NameText"/>
-        <Button Grid.Row="0" Grid.Column="1"
-                Classes="button_no_border"
-                Background="Transparent"
-                Foreground="#FF4040"
-                FontSize="12"
-                Click="RemoveFromList">
-            [X]
-        </Button>
-        <TextBlock Grid.Row="1" Grid.Column="0" Name="DownloadedProgressText"/>
-    </Grid>
-</UserControl>

Млаумчерб.Клиент/видимое/DownloadItemView.axaml.cs

@@ -1,42 +0,0 @@
-using Avalonia.Controls;
-using Avalonia.Interactivity;
-using Avalonia.Threading;
-using Млаумчерб.Клиент.сеть;
-
-namespace Млаумчерб.Клиент.видимое;
-
-public partial class DownloadTaskView : UserControl
-{
-    private readonly NetworkTask _task;
-    private readonly Action<DownloadTaskView> _removeFromList;
-
-
-    public DownloadTaskView()
-    {
-        throw new NotImplementedException();
-    }
-    
-    public DownloadTaskView(NetworkTask task, Action<DownloadTaskView> removeFromList)
-    {
-        _task = task;
-        _removeFromList = removeFromList;
-        InitializeComponent();
-        NameText.Text = task.Name;
-        task.OnProgress += ReportProgress;
-    }
-
-    
-    void ReportProgress(DownloadProgress progress)
-    {
-        Dispatcher.UIThread.Invoke(() =>
-        {
-            DownloadedProgressText.Text = progress.ToString();
-        });
-    }
-
-    private void RemoveFromList(object? sender, RoutedEventArgs e)
-    {
-        _task.Cancel();
-        Dispatcher.UIThread.Invoke(() => _removeFromList.Invoke(this));
-    }
-}

Млаумчерб.Клиент/зримое/DownloadItemView.axaml

@@ -0,0 +1,26 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="Млаумчерб.Клиент.зримое.NetworkTaskView"
+             Padding="4" MinHeight="90" MinWidth="200"
+             VerticalAlignment="Top"
+             HorizontalAlignment="Stretch"
+             BorderThickness="1" BorderBrush="#999999">
+    <Grid RowDefinitions="* * *" ColumnDefinitions="* 30">
+        <TextBlock Name="NameText" 
+                   Grid.Row="0" Grid.Column="0" />
+        <Button Grid.Row="0" Grid.Column="1"
+                Classes="button_no_border"
+                Background="Transparent"
+                Foreground="#FF4040"
+                FontSize="12"
+                Click="RemoveFromList">
+            [X]
+        </Button>
+        <TextBlock Name="StatusText"
+            Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" 
+            FontSize="15"/>
+        <TextBlock Name="ProgressText"
+                   Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2" 
+                   FontSize="14"/>
+    </Grid>
+</UserControl>

Млаумчерб.Клиент/зримое/DownloadItemView.axaml.cs

@@ -0,0 +1,66 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Threading;
+using Млаумчерб.Клиент.сеть;
+
+namespace Млаумчерб.Клиент.зримое;
+
+public partial class NetworkTaskView : UserControl
+{
+    public readonly NetworkTask Task;
+    private readonly Action<NetworkTaskView> _removeFromList;
+
+
+    public NetworkTaskView()
+    {
+        throw new Exception();
+    }
+    
+    public NetworkTaskView(NetworkTask task, Action<NetworkTaskView> removeFromList)
+    {
+        Task = task;
+        _removeFromList = removeFromList;
+        InitializeComponent();
+        NameText.Text = task.Name;
+        StatusText.Text = task.DownloadStatus.ToString();
+        task.OnStart += OnTaskOnStart;
+        task.OnProgress += ReportProgress;
+        task.OnStop += OnTaskStop;
+    }
+
+    private void OnTaskOnStart()
+    {
+        Dispatcher.UIThread.Invoke(() =>
+        {
+            StatusText.Text = Task.DownloadStatus.ToString();
+        });
+    }
+
+    private void OnTaskStop(NetworkTask.Status status)
+    {
+        Dispatcher.UIThread.Invoke(() =>
+        {
+            StatusText.Text = status.ToString();
+            if(!string.IsNullOrEmpty(ProgressText.Text))
+            {
+                int speedIndex = ProgressText.Text.IndexOf('(');
+                if(speedIndex > 0)
+                    ProgressText.Text = ProgressText.Text.Remove(speedIndex);
+            }
+        });
+    }
+
+    void ReportProgress(DownloadProgress progress)
+    {
+        Dispatcher.UIThread.Invoke(() =>
+        {
+            ProgressText.Text = progress.ToString();
+        });
+    }
+
+    private void RemoveFromList(object? sender, RoutedEventArgs e)
+    {
+        Task.Cancel();
+        Dispatcher.UIThread.Invoke(() => _removeFromList.Invoke(this));
+    }
+}

Млаумчерб.Клиент/зримое/LogMessageView.axaml

@@ -0,0 +1,13 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             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"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Млаумчерб.Клиент.зримое.LogMessageView"
+             FontSize="14">
+    <SelectableTextBlock Name="ContentTextBox"
+                         FontSize="{Binding $parent.FontSize}"
+                         TextWrapping="Wrap"
+                         VerticalAlignment="Top"
+                         Background="Transparent"/>
+</UserControl>

Млаумчерб.Клиент/зримое/LogMessageView.axaml.cs

@@ -0,0 +1,24 @@
+using Avalonia.Controls;
+using DTLib;
+
+namespace Млаумчерб.Клиент.зримое;
+
+public partial class LogMessageView : UserControl
+{
+    public static ILogFormat ShortLogFormat = new DefaultLogFormat
+    {
+        TimeStampFormat = MyTimeFormat.TimeOnly,
+        PrintContext = false
+    }; 
+    
+    public LogMessageView()
+    {
+        throw new Exception();
+    }
+
+    public LogMessageView(LauncherLogger.LogMessage m)
+    {
+        InitializeComponent();
+        ContentTextBox.Text = ShortLogFormat.CreateMessage(m.context, m.severity, m.message);
+    }
+}

Млаумчерб.Клиент/зримое/VersionItemView.axaml

@@ -4,6 +4,6 @@
              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
              xmlns:local="clr-namespace:Млаумчерб.Клиент"
              mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
-             x:Class="Млаумчерб.Клиент.видимое.VersionItemView">
+             x:Class="Млаумчерб.Клиент.зримое.VersionItemView">
     <TextBlock Name="text" Background="Transparent"/>
 </UserControl>

Млаумчерб.Клиент/зримое/VersionItemView.axaml.cs

@@ -2,7 +2,7 @@
 using Avalonia.Media;
 using Млаумчерб.Клиент.классы;
 
-namespace Млаумчерб.Клиент.видимое;
+namespace Млаумчерб.Клиент.зримое;
 
 public partial class VersionItemView : ListBoxItem
 {

Млаумчерб.Клиент/зримое/Окне.axaml

@@ -2,7 +2,7 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:gif="clr-namespace:Avalonia.Labs.Gif;assembly=Avalonia.Labs.Gif"
         xmlns:local="clr-namespace:Млаумчерб"
-        x:Class="Млаумчерб.Клиент.видимое.Окне"
+        x:Class="Млаумчерб.Клиент.зримое.Окне"
         Name="window"
         Title="млаумчерб"
         Icon="avares://млаумчерб/капитал/кубе.ico"
@@ -17,29 +17,8 @@
         
         <Grid Grid.Row="0" Margin="10">
             <Grid.ColumnDefinitions>* 300 *</Grid.ColumnDefinitions>
-            <Border Grid.Column="0" 
+            
-                    Classes="dark_tr_bg white_border">
+            <!-- Central panel -->
-                <Grid>
-                    <Grid.RowDefinitions>30 *</Grid.RowDefinitions>
-                    <Border Classes="white_border" Margin="-1" Padding="4">
-                        <TextBlock FontWeight="Bold" 
-                                   HorizontalAlignment="Center" 
-                                   VerticalAlignment="Center">
-                            Лог
-                        </TextBlock>
-                    </Border>
-                    <ScrollViewer Name="LogScrollViewer" Grid.Row="1" 
-                            HorizontalScrollBarVisibility="Disabled"
-                            VerticalScrollBarVisibility="Visible"
-                            Background="Transparent">
-                        <TextBox Name="LogTextBox" 
-                                 FontSize="14"
-                                 IsReadOnly="True" TextWrapping="Wrap"
-                                 VerticalAlignment="Top"
-                                 Background="Transparent" BorderThickness="0"/>
-                    </ScrollViewer>
-                </Grid>
-            </Border>
             <Border Grid.Column="1" 
                     Classes="dark_tr_bg white_border"
                     Margin="10 0">
@@ -67,14 +46,17 @@
                         </Slider>
                         
                         <CheckBox IsChecked="{Binding #window.Fullscreen}">
-                            Запустить полноэкранное
+                            Запускать полноэкранное
                         </CheckBox>
-                        
                         <CheckBox IsChecked="{Binding #window.CheckGameFiles}">
-                            Проверить файлы игры
+                            Проверять файлы игры
+                        </CheckBox>
+                        <CheckBox IsChecked="{Binding #window.EnableJavaDownload}">
+                            Скачивать джаву
                         </CheckBox>
                     </StackPanel>
-                    <Button Grid.Row="1" Margin="10" Padding="0 0 0 4"
+                    <Button Name="LaunchButton" Grid.Row="1"
+                            Margin="10" Padding="0 0 0 4"
                             Classes="button_no_border"
                             Background="#BBfd7300"
                             Click="Запуск">
@@ -83,22 +65,60 @@
                 </Grid>
             </Border>
             
+            <!-- Left panel -->
+            <Border Grid.Column="0" 
+                    Classes="dark_tr_bg white_border">
+                <Grid>
+                    <Grid.RowDefinitions>36 *</Grid.RowDefinitions>
+                    <Border Classes="white_border" Margin="-1" Padding="4">
+                        <DockPanel>
+                            <TextBlock FontWeight="Bold"
+                                       DockPanel.Dock="Left">
+                                Лог
+                            </TextBlock>
+                            <Button Click="ClearLogPanel"
+                                    Classes="menu_button"
+                                    DockPanel.Dock="Right"
+                                    HorizontalAlignment="Right">
+                                очистить
+                            </Button>
+                        </DockPanel>
+                    </Border>
+                    <ScrollViewer Name="LogScrollViewer" Grid.Row="1" 
+                                  HorizontalScrollBarVisibility="Disabled"
+                                  VerticalScrollBarVisibility="Visible"
+                                  Background="Transparent">
+                        <StackPanel Name="LogPanel" 
+                                    VerticalAlignment="Top"/>
+                    </ScrollViewer>
+                </Grid>
+            </Border>
+            
+            <!-- Right panel -->
             <Border Grid.Column="2" Classes="dark_tr_bg white_border">
                 <Grid>
-                    <Grid.RowDefinitions>30 *</Grid.RowDefinitions>
+                    <Grid.RowDefinitions>36 *</Grid.RowDefinitions>
                     <Border Classes="white_border" Margin="-1" Padding="4">
-                        <TextBlock FontWeight="Bold" 
+                        <DockPanel>
-                                   HorizontalAlignment="Center" 
+                            <TextBlock FontWeight="Bold"
-                                   VerticalAlignment="Center">
+                                       DockPanel.Dock="Left">
-                            Загрузки
+                                Загрузки
-                        </TextBlock>
+                            </TextBlock>
+                            <Button Click="ClearDownloadsPanel"
+                                    Classes="menu_button"
+                                    DockPanel.Dock="Right"
+                                    HorizontalAlignment="Right">
+                                очистить
+                            </Button>
+                        </DockPanel>
                     </Border>
                     <ScrollViewer Grid.Row="1" 
                                   HorizontalScrollBarVisibility="Disabled"
                                   VerticalScrollBarVisibility="Visible"
                                   Background="Transparent" 
                                   Padding="1">
-                        <StackPanel Name="DownloadsPanel" VerticalAlignment="Top"/>    
+                        <StackPanel Name="DownloadsPanel" 
+                                    VerticalAlignment="Top"/>    
                     </ScrollViewer>
                 </Grid>
             </Border>
@@ -106,7 +126,7 @@
         <Border Grid.Row="1" Background="#954808B0">
             <Grid>
                 <StackPanel Orientation="Horizontal" HorizontalAlignment="Left">
-                    <Button Classes="menu_button button_no_border" Click="ОткрытьПапкуЛаунчера">директория лаунчера</Button>
+                    <Button Classes="menu_button button_no_border" Click="ОткрытьПапкуЛаунчера">папка лаунчера</Button>
                     <Border Classes="menu_separator"/>
                     <Button Classes="menu_button button_no_border" Click="ОткрытьФайлЛогов">лог-файл</Button>
                 </StackPanel>

Млаумчерб.Клиент/зримое/Окне.axaml.cs

@@ -6,7 +6,7 @@ using Avalonia.Platform.Storage;
 using Avalonia.Threading;
 using Млаумчерб.Клиент.классы;
 
-namespace Млаумчерб.Клиент.видимое;
+namespace Млаумчерб.Клиент.зримое;
 
 public partial class Окне : Window
 {
@@ -46,6 +46,16 @@ public partial class Окне : Window
         set => SetValue(CheckGameFilesProperty, value);
     }
     
+    
+    public static readonly StyledProperty<bool> EnableJavaDownloadProperty =
+        AvaloniaProperty.Register<Окне, bool>(nameof(EnableJavaDownload),
+            defaultBindingMode: BindingMode.TwoWay, defaultValue: true);
+    public bool EnableJavaDownload
+    {
+        get => GetValue(EnableJavaDownloadProperty);
+        set => SetValue(EnableJavaDownloadProperty, value);
+    }
+    
     public Окне()
     {
         InitializeComponent();
@@ -55,34 +65,14 @@ public partial class Окне : Window
     {
         try
         {
-            Приложение.Логгер.OnLogMessage += (context, severity, message, format) =>
+            Приложение.Логгер.OnLogMessage += GuiLogMessage;
-            {
+
-                if(severity == LogSeverity.Debug)
-                    return;
-                
-                StringBuilder b = new();
-                b.Append(DateTime.Now.ToString("[HH:mm:ss]["));
-                b.Append(severity);
-                b.Append("]: ");
-                b.Append(message);
-                b.Append('\n');
-                Dispatcher.UIThread.Invoke(() =>
-                {
-                    double offsetFromBottom = LogScrollViewer.Extent.Height
-                                              - LogScrollViewer.Offset.Y
-                                              - LogScrollViewer.Viewport.Height;
-                    bool is_scrolled_to_end = offsetFromBottom < 20.0; // scrolled less then one line up 
-                    LogTextBox.Text += b.ToString();
-                    if (is_scrolled_to_end)
-                        LogScrollViewer.ScrollToEnd();
-                });
-            };
-            
             Username = Приложение.Настройки.имя_пользователя;
             MemoryLimit = Приложение.Настройки.выделенная_память_мб;
-            Fullscreen = Приложение.Настройки.открывать_на_весь_экран;
+            Fullscreen = Приложение.Настройки.запускать_полноэкранное;
-            
+            EnableJavaDownload = Приложение.Настройки.скачивать_жабу;
-            Directory.Create(Пути.GetVersionDescriptorDir());
+
+            Directory.Create(Пути.GetVersionDescriptorsDir());
             VersionComboBox.SelectedIndex = 0;
             VersionComboBox.IsEnabled = false;
             var versions = await GameVersion.GetAllVersionsAsync();
@@ -91,8 +81,8 @@ public partial class Окне : Window
                 foreach (var p in versions)
                 {
                     VersionComboBox.Items.Add(new VersionItemView(p));
-                    if (Приложение.Настройки.последняя_запущенная_версия != null && 
+                    if (Приложение.Настройки.последняя_запущенная_версия != null &&
-                        p.Name == Приложение.Настройки.последняя_запущенная_версия) 
+                        p.Name == Приложение.Настройки.последняя_запущенная_версия)
                         VersionComboBox.SelectedIndex = VersionComboBox.Items.Count - 1;
                 }
                 VersionComboBox.IsEnabled = true;
@@ -104,38 +94,62 @@ public partial class Окне : Window
         }
     }
 
+    private void GuiLogMessage(LauncherLogger.LogMessage msg)
+    {
+        if (msg.severity == LogSeverity.Debug) return;
+
+        Dispatcher.UIThread.Invoke(() =>
+        {
+            double offsetFromBottom = LogScrollViewer.Extent.Height - LogScrollViewer.Offset.Y - LogScrollViewer.Viewport.Height;
+            bool is_scrolled_to_end = offsetFromBottom < 20.0; // scrolled less then one line up 
+            LogPanel.Children.Add(new LogMessageView(msg));
+            if (is_scrolled_to_end) LogScrollViewer.ScrollToEnd();
+        });
+    }
+
     private async void Запуск(object? sender, RoutedEventArgs e)
     {
         try
         {
+            Dispatcher.UIThread.Invoke(() => LaunchButton.IsEnabled = false);
+            
             var selectedVersionView = (VersionItemView?)VersionComboBox.SelectedItem;
             var selectedVersion = selectedVersionView?.Props;
             Приложение.Настройки.последняя_запущенная_версия = selectedVersion?.Name;
             Приложение.Настройки.имя_пользователя = Username;
             Приложение.Настройки.выделенная_память_мб = MemoryLimit;
-            Приложение.Настройки.открывать_на_весь_экран = Fullscreen;
+            Приложение.Настройки.запускать_полноэкранное = Fullscreen;
+            Приложение.Настройки.скачивать_жабу = EnableJavaDownload;
             Приложение.Настройки.СохранитьВФайл();
             if (selectedVersion == null) 
                 return;
             
             var v = await GameVersion.CreateFromPropsAsync(selectedVersion);
-            var updateTasks = await v.CreateUpdateTasksAsync(CheckGameFiles);
+            await v.UpdateFiles(CheckGameFiles, nt =>
-            foreach (var t in updateTasks)
-            {
-                var updateTask = t.StartAsync();
-                Dispatcher.UIThread.Invoke(() =>
                 {
-                    var view = new DownloadTaskView(t, view => DownloadsPanel.Children.Remove(view));
+                    Dispatcher.UIThread.Invoke(() =>
-                    DownloadsPanel.Children.Add(view);
+                    {
-                });
+                        DownloadsPanel.Children.Add(new NetworkTaskView(nt,
-                await updateTask;
+                            ntv => DownloadsPanel.Children.Remove(ntv)));
-            }
+                    });
-            Dispatcher.UIThread.Invoke(() => CheckGameFiles = false);
+                }
+            );
+            Dispatcher.UIThread.Invoke(() =>
+            {
+                CheckGameFiles = false;
+            });
         }
         catch (Exception ex)
         {
             Ошибки.ПоказатьСообщение(nameof(Окне), ex);
         }
+        finally
+        {
+            Dispatcher.UIThread.Invoke(() =>
+            {
+                LaunchButton.IsEnabled = true;
+            });
+        }
     }
 
     private void ОткрытьПапкуЛаунчера(object? s, RoutedEventArgs e)
@@ -176,4 +190,20 @@ public partial class Окне : Window
             Ошибки.ПоказатьСообщение(nameof(Окне), ex);
         }
     }
+
+    private void ClearLogPanel(object? sender, RoutedEventArgs e)
+    {
+        LogPanel.Children.Clear();
+    }
+    
+    
+    private void ClearDownloadsPanel(object? sender, RoutedEventArgs e)
+    {
+        foreach (var control in DownloadsPanel.Children)
+        {
+            var nt = (NetworkTaskView)control;
+            nt.Task.Cancel();
+        }
+        DownloadsPanel.Children.Clear();
+    }
 }

Млаумчерб.Клиент/зримое/Приложение.axaml

@@ -1,6 +1,6 @@
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             x:Class="Млаумчерб.Клиент.видимое.Приложение"
+             x:Class="Млаумчерб.Клиент.зримое.Приложение"
              RequestedThemeVariant="Dark">
     <Application.Styles>
         <SimpleTheme />

Млаумчерб.Клиент/зримое/Приложение.axaml.cs

@@ -2,7 +2,7 @@ using Avalonia;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
 
-namespace Млаумчерб.Клиент.видимое;
+namespace Млаумчерб.Клиент.зримое;
 
 public class Приложение : Application
 {

Млаумчерб.Клиент/классы/GameVersionDescriptor.cs

@@ -11,10 +11,10 @@ public class GameVersionDescriptor
     [JsonRequired] public string type { get; set; } = "";
     [JsonRequired] public string mainClass { get; set; } = "";
     [JsonRequired] public Downloads downloads { get; set; } = null!;
-    [JsonRequired] public JavaVersion javaVersion { get; set; } = null!;
     [JsonRequired] public List<Library> libraries { get; set; } = null!;
     [JsonRequired] public AssetIndexProperties assetIndex { get; set; } = null!;
     [JsonRequired] public string assets { get; set; } = "";
+    public JavaVersion javaVersion { get; set; } = new() { component = "jre-legacy", majorVersion = 8 };
     public string? minecraftArguments { get; set; }
     public ArgumentsNew? arguments { get; set; }
 }

Млаумчерб.Клиент/классы/GameVersionProps.cs

@@ -1,6 +1,6 @@
 namespace Млаумчерб.Клиент.классы;
 
-public class GameVersionProps
+public class GameVersionProps : IComparable<GameVersionProps>, IEquatable<GameVersionProps>
 {
     public string Name { get; }
     public IOPath LocalDescriptorPath { get; }
@@ -31,4 +31,33 @@ public class GameVersionProps
         this(name, url, Пути.GetVersionDescriptorPath(name)) { }
 
     public override string ToString() => Name;
+
+    public override int GetHashCode() => Name.GetHashCode();
+
+    public int CompareTo(GameVersionProps? other)
+    {
+        if (ReferenceEquals(this, other)) return 0;
+        if (other is null) return 1;
+        
+        if (Version.TryParse(Name, out var version1) && Version.TryParse(other.Name, out var version2))
+        {
+            return version1.CompareTo(version2);
+        }
+        
+        return String.Compare(Name, other.Name, StringComparison.InvariantCulture);
+    }
+
+    public bool Equals(GameVersionProps? other)
+    {
+        if (other is null) return false;
+        if (ReferenceEquals(this, other)) return true;
+        return Name == other.Name;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        if (obj is GameVersionProps other) return Equals(other);
+        if (ReferenceEquals(this, obj)) return true;
+        return false;
+    }
 }

Млаумчерб.Клиент/классы/JavaVersionCatalog.cs

@@ -1,23 +1,77 @@
-namespace Млаумчерб.Клиент.классы;
+using System.Runtime.InteropServices;
+
+namespace Млаумчерб.Клиент.классы;
 
 public class JavaVersionCatalog
 {
-    
+    [JsonProperty("linux")]
+    public Dictionary<string, JavaVersionProps[]>? linux_x86 { get; set; }
+    [JsonProperty("linux-i386")] 
+    public Dictionary<string, JavaVersionProps[]>? linux_x64 { get; set; }
+    [JsonProperty("mac-os")] 
+    public Dictionary<string, JavaVersionProps[]>? osx_x64 { get; set; }
+    [JsonProperty("mac-os-arm64")] 
+    public Dictionary<string, JavaVersionProps[]>? osx_arm64 { get; set; }
+    [JsonProperty("windows-arm64")] 
+    public Dictionary<string, JavaVersionProps[]>? windows_arm64 { get; set; }
+    [JsonProperty("windows-x64")]
+    public Dictionary<string, JavaVersionProps[]>? windows_x64 { get; set; }
+    [JsonProperty("windows-x86")] 
+    public Dictionary<string, JavaVersionProps[]>? windows_x86 { get; set; }
+
+    public JavaVersionProps GetVersionProps(JavaVersion version)
+    {
+        var arch = RuntimeInformation.OSArchitecture;
+        Dictionary<string, JavaVersionProps[]>? propsDict = null;
+        switch (arch)
+        {
+            case Architecture.X86:
+                if (OperatingSystem.IsWindows())
+                    propsDict = windows_x86;
+                else if (OperatingSystem.IsLinux())
+                    propsDict = linux_x86;
+                break;
+            case Architecture.X64:
+                if (OperatingSystem.IsWindows())
+                    propsDict = windows_x64;
+                else if (OperatingSystem.IsLinux())
+                    propsDict = linux_x64;
+                else if (OperatingSystem.IsMacOS())
+                    propsDict = osx_x64;
+                break;
+            case Architecture.Arm64:
+                if (OperatingSystem.IsWindows())
+                    propsDict = windows_arm64;
+                else if (OperatingSystem.IsMacOS())
+                    propsDict = osx_arm64;
+                break;
+        }
+
+        if (propsDict != null && propsDict.TryGetValue(version.component, out var props_array))
+        {
+            if (props_array.Length != 0)
+                return props_array[0];
+        }
+        
+        throw new PlatformNotSupportedException($"Can't download java {version.majorVersion} for your operating system. " +
+              $"Download it manually to directory {Пути.GetJavaRuntimeDir(version.component)}");
+    }
 }
 
 public class JavaVersionProps
 {
-    [JsonRequired] public Artifact manifest { get; set; }
+    /// url of JavaDistributiveManifest
+    [JsonRequired] public Artifact manifest { get; set; } = null!;
 }
 
-public class JavaVersionManifest
+public class JavaDistributiveManifest
 {
-    [JsonRequired] public Dictionary<string, JavaDistributiveElementProps> manifest { get; set; }
+    [JsonRequired] public Dictionary<string, JavaDistributiveElementProps> files { get; set; } = null!;
 }
 
 public class JavaDistributiveElementProps
 {
-    // "directory" / "file"
+    /// "directory" / "file"
     [JsonRequired] public string type { get; set; } = "";
     public bool? executable { get; set; }
     public JavaCompressedArtifact? downloads { get; set; }
@@ -26,5 +80,5 @@ public class JavaDistributiveElementProps
 public class JavaCompressedArtifact
 {
     public Artifact? lzma { get; set; }
-    public Artifact raw { get; set; } = null!;
+    [JsonRequired] public Artifact raw { get; set; } = null!;
 }

Млаумчерб.Клиент/классы/Libraries.cs

@@ -1,4 +1,5 @@
-using DTLib.Extensions;
+using System.Runtime.InteropServices;
+using DTLib.Extensions;
 
 namespace Млаумчерб.Клиент.классы;
 
@@ -35,6 +36,23 @@ public class Libraries
                 if(nativesKey is null)
                     throw new Exception($"nativesKey for '{l.name}' is null");
                 
+                // example: "natives-windows-${arch}"
+                if (nativesKey.Contains('$'))
+                {
+                    var span = nativesKey.AsSpan();
+                    nativesKey = span.After("${").Before('}') switch
+                    {
+                        "arch" => RuntimeInformation.OSArchitecture switch
+                        {
+                            Architecture.X64 => span.Before("${").ToString() + "64",
+                            Architecture.X86 => span.Before("${").ToString() + "32",
+                            _ => throw new PlatformNotSupportedException(
+                                $"Unsupported architecture: {RuntimeInformation.OSArchitecture}")
+                        },
+                        _ => throw new Exception($"unknown placeholder in {nativesKey}")
+                    };
+                }
+                
                 Artifact artifact = null!;
                 if(l.downloads.classifiers != null && !l.downloads.classifiers.TryGetValue(nativesKey, out artifact!))
                     throw new Exception($"can't find artifact for '{l.name}' with nativesKey '{nativesKey}'");

Млаумчерб.Клиент/классы/Буржуазия.cs

@@ -17,7 +17,7 @@ public static class Буржуазия
         && os.arch switch
         {
             null => true,
-            "x86" => RuntimeInformation.OSArchitecture == Architecture.X86,
+            "i386" or "x86" => RuntimeInformation.OSArchitecture == Architecture.X86,
             "x64" => RuntimeInformation.OSArchitecture == Architecture.X64,
             "arm64" => RuntimeInformation.OSArchitecture == Architecture.Arm64,
             _ => false

Млаумчерб.Клиент/классы/Пути.cs

@@ -1,4 +1,4 @@
-using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.зримое;
 
 namespace Млаумчерб.Клиент.классы;
 
@@ -7,14 +7,14 @@ public static class Пути
     public static IOPath GetAssetIndexFilePath(string id) => 
         Path.Concat(Приложение.Настройки.путь_к_кубачу, $"assets/indexes/{id}.json");
     
-    public static IOPath GetVersionDescriptorDir() =>
+    public static IOPath GetVersionDescriptorsDir() =>
-        Path.Concat(Приложение.Настройки.путь_к_кубачу, "version_descriptors");
+        Path.Concat(Приложение.Настройки.путь_к_кубачу, "versions");
     
     public static string GetVersionDescriptorName(IOPath path) =>
         path.LastName().RemoveExtension().ToString();
     
     public static IOPath GetVersionDescriptorPath(string name) => 
-        Path.Concat(GetVersionDescriptorDir(), Path.ReplaceRestrictedChars(name) + ".json");
+        Path.Concat(GetVersionDescriptorsDir(), Path.ReplaceRestrictedChars(name) + ".json");
     
     public static IOPath GetVersionDir(string id) => 
         Path.Concat(Приложение.Настройки.путь_к_кубачу, "versions", id);

Млаумчерб.Клиент/сеть/NetworkProgressReporter.cs

@@ -1,4 +1,4 @@
-using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.зримое;
 using Timer = DTLib.Timer;
 
 namespace Млаумчерб.Клиент.сеть;
@@ -28,10 +28,9 @@ public class NetworkProgressReporter : IDisposable
     }
 
     // atomic add
-    public void AddBytesCount(ArraySegment<byte> chunk)
+    public void AddBytesCount(byte[] buffer, int offset, int count)
     {
-        long chunkSize = chunk.Count;
+        Interlocked.Add(ref _curSize, count);
-        Interlocked.Add(ref _curSize, chunkSize);
     }
     
     public void Start()

Млаумчерб.Клиент/сеть/NetworkTask.cs

@@ -7,7 +7,7 @@ public class NetworkTask : IDisposable
     public enum Status
     {
         Initialized,
-        Running,
+        Started,
         Completed,
         Cancelled,
         Failed
@@ -15,6 +15,7 @@ public class NetworkTask : IDisposable
 
     public Status DownloadStatus { get; private set; } = Status.Initialized;
 
+    public event Action? OnStart; 
     public event Action<DownloadProgress>? OnProgress;
     public event Action<Status>? OnStop; 
 
@@ -35,15 +36,20 @@ public class NetworkTask : IDisposable
 
     public async Task StartAsync()
     {
-        if(DownloadStatus == Status.Running || DownloadStatus == Status.Completed)
+        if(DownloadStatus == Status.Started || DownloadStatus == Status.Completed)
             return;
-        DownloadStatus = Status.Running;
+        DownloadStatus = Status.Started;
         try
         {
             _progressReporter.Start();
+            OnStart?.Invoke();
             await _downloadAction(_progressReporter, _cts.Token);
             DownloadStatus = Status.Completed;
         }
+        catch (OperationCanceledException)
+        {
+            DownloadStatus = Status.Cancelled;
+        }
         catch
         {
             DownloadStatus = Status.Failed;

Млаумчерб.Клиент/сеть/NetworkTaskFactories/AssetsDownloadTaskFactory.cs

@@ -1,6 +1,8 @@
-using System.Security.Cryptography;
+using System.Net;
+using System.Net.Http;
+using System.Security.Cryptography;
 using DTLib.Extensions;
-using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.зримое;
 using Млаумчерб.Клиент.классы;
 using static Млаумчерб.Клиент.сеть.Сеть;
 
@@ -37,7 +39,7 @@ public class AssetsDownloadTaskFactory : INetworkTaskFactory
         if(!File.Exists(_indexFilePath))
         {
             Приложение.Логгер.LogInfo(nameof(Сеть), $"started downloading asset index to '{_indexFilePath}'");
-            await DownloadFileHTTP(_descriptor.assetIndex.url, _indexFilePath);
+            await DownloadFile(_descriptor.assetIndex.url, _indexFilePath);
             Приложение.Логгер.LogInfo(nameof(Сеть), "finished downloading asset index");
         }
 
@@ -86,7 +88,7 @@ public class AssetsDownloadTaskFactory : INetworkTaskFactory
         public string url;
         public IOPath filePath;
 
-        public AssetDownloadProperties(string key, GameAssetProperties p)
+        public AssetDownloadProperties(string key, AssetProperties p)
         {
             name = key;
             hash = p.hash;
@@ -100,13 +102,35 @@ public class AssetsDownloadTaskFactory : INetworkTaskFactory
     private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
     {
         Приложение.Логгер.LogInfo(nameof(Сеть), $"started downloading assets '{_descriptor.assetIndex.id}'");
-        ParallelOptions opt = new() { MaxDegreeOfParallelism = ParallelDownloadsN, CancellationToken = ct };
+        ParallelOptions opt = new()
+        {
+            MaxDegreeOfParallelism = Приложение.Настройки.максимум_параллельных_загрузок,
+            CancellationToken = ct
+        };
         await Parallel.ForEachAsync(_assetsToDownload, opt, 
-            async (a, _ct) =>
+        async (a, _ct) =>
+        {
+            bool completed = false;
+            while(!completed)
             {
                 Приложение.Логгер.LogDebug(nameof(Сеть), $"downloading asset '{a.name}' {a.hash}");
-                await DownloadFileHTTP(a.url, a.filePath, _ct, pr.AddBytesCount);
+                try
-            });
+                {
+                    await DownloadFile(a.url, a.filePath, _ct, pr.AddBytesCount);
+                    completed = true;
+                }
+                catch (HttpRequestException httpException)
+                {
+                    // wait on rate limit
+                    if(httpException.StatusCode == HttpStatusCode.TooManyRequests)
+                    {
+                        Приложение.Логгер.LogDebug(nameof(Сеть), "rate limit hit");
+                        await Task.Delay(1000, _ct);
+                    }
+                    else throw;
+                }
+            }
+        });
         Приложение.Логгер.LogInfo(nameof(Сеть), $"finished downloading assets '{_descriptor.assetIndex.id}'");
     }
 }

Млаумчерб.Клиент/сеть/NetworkTaskFactories/JavaDownloadTaskFactory.cs

@@ -1,5 +1,6 @@
 using System.Security.Cryptography;
-using EasyCompressor;
+using DTLib.Extensions;
+using Млаумчерб.Клиент.зримое;
 using Млаумчерб.Клиент.классы;
 using static Млаумчерб.Клиент.сеть.Сеть;
 
@@ -7,23 +8,27 @@ namespace Млаумчерб.Клиент.сеть.NetworkTaskFactories;
 
 public class JavaDownloadTaskFactory : INetworkTaskFactory
 {
-    private const string INDEX_URL =
+    private const string CATALOG_URL =
         "https://launchermeta.mojang.com/v1/products/java-runtime/2ec0cc96c44e5a76b9c8b7c39df7210883d12871/all.json";
     private GameVersionDescriptor _descriptor;
     private IOPath _javaVersionDir;
     private SHA1 _hasher;
-    private LZMACompressor _lzma;
+    private JavaDistributiveManifest? _distributiveManifest;
+    private List<(IOPath path, JavaDistributiveElementProps props)> _filesToDownload = new();
     
     public JavaDownloadTaskFactory(GameVersionDescriptor descriptor)
     {
         _descriptor = descriptor;
         _javaVersionDir = Пути.GetJavaRuntimeDir(_descriptor.javaVersion.component);
         _hasher = SHA1.Create();
-        _lzma = new LZMACompressor();
     }
 
-    public Task<NetworkTask?> CreateAsync(bool checkHashes)
+    public async Task<NetworkTask?> CreateAsync(bool checkHashes)
     {
+        var catalog = await DownloadStringAndDeserialize<JavaVersionCatalog>(CATALOG_URL);
+        var versionProps = catalog.GetVersionProps(_descriptor.javaVersion);
+        _distributiveManifest = await DownloadStringAndDeserialize<JavaDistributiveManifest>(versionProps.manifest.url);
+        
         NetworkTask? networkTask = null;
         if (!CheckFiles(checkHashes))
             networkTask = new(
@@ -31,26 +36,87 @@ public class JavaDownloadTaskFactory : INetworkTaskFactory
                     GetTotalSize(),
                     Download
                 );
-        return Task.FromResult(networkTask);
+        return networkTask;
     }
 
     private bool CheckFiles(bool checkHashes)
     {
-        //TODO: download catalog
+        _filesToDownload.Clear();
-        //TODO: download manifest for required runtime
+        foreach (var pair in _distributiveManifest!.files)
-        //TODO: check whether files from manifest exist and match hashes
+        {
-        throw new NotImplementedException();
+            if (pair.Value.type != "file")
+                continue;
+
+            if (pair.Value.downloads != null)
+            {
+                var artifact = pair.Value.downloads;
+                IOPath file_path = Path.Concat(_javaVersionDir, pair.Key);
+                if (!File.Exists(file_path))
+                {
+                    _filesToDownload.Add((file_path, pair.Value));
+                }
+                else if(checkHashes)
+                {
+                    using var fs = File.OpenRead(file_path);
+                    if (_hasher.ComputeHash(fs).HashToString() != artifact.raw.sha1)
+                    {
+                        _filesToDownload.Add((file_path, pair.Value));
+                    }
+                }
+            }
+        }
+
+        return _filesToDownload.Count == 0;
     }
     
     private long GetTotalSize()
     {
-        //TODO: sum up size of all files invalidated by CheckFiles
+        long totalSize = 0;
-        throw new NotImplementedException();
+        foreach (var file in _filesToDownload)
+        {
+            if(file.props.downloads == null)
+                continue;
+            totalSize += file.props.downloads.lzma?.size ?? file.props.downloads.raw.size;
+        }
+        return totalSize;
     }
 
-    private Task Download(NetworkProgressReporter pr, CancellationToken ct)
+    private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
     {
-        //TODO: download files using lzma decompression
+        Приложение.Логгер.LogInfo(nameof(Сеть), "started downloading java runtime " +
-        throw new NotImplementedException();
+                    $"{_descriptor.javaVersion.majorVersion} '{_descriptor.javaVersion.component}'");
+        
+        ParallelOptions opt = new()
+        {
+            MaxDegreeOfParallelism = Приложение.Настройки.максимум_параллельных_загрузок,
+            CancellationToken = ct
+        };
+        await Parallel.ForEachAsync(_filesToDownload, opt, async (f, _ct) =>
+        {
+            if (f.props.downloads!.lzma != null)
+            {
+                Приложение.Логгер.LogDebug(nameof(Сеть), $"downloading lzma-compressed file '{f.path}'");
+                await using var pipe = new TransformStream(await GetStream(f.props.downloads.lzma.url, _ct));
+                pipe.AddTransform(pr.AddBytesCount);
+                await using var fs = File.OpenWrite(f.path);
+                LZMACompressor.Decompress(pipe, fs);
+            }
+            else
+            {
+                Приложение.Логгер.LogDebug(nameof(Сеть), $"downloading raw file '{f.path}'");
+                await DownloadFile(f.props.downloads.raw.url, f.path, _ct, pr.AddBytesCount);
+            }
+            
+            if(!OperatingSystem.IsWindows() && f.props.executable is true)
+            {
+                Приложение.Логгер.LogDebug(nameof(Сеть), $"adding execute rights to file '{f.path}'");
+                System.IO.File.SetUnixFileMode(f.path.ToString(), UnixFileMode.UserExecute);
+            }
+        });
+        
+        Приложение.Логгер.LogInfo(nameof(Сеть), "finished downloading java runtime " + 
+                    $"{_descriptor.javaVersion.majorVersion} '{_descriptor.javaVersion.component}'");
     }
+    
+    
 }

Млаумчерб.Клиент/сеть/NetworkTaskFactories/LibrariesDownloadTaskFactory.cs

@@ -1,7 +1,7 @@
 using System.IO.Compression;
 using System.Security.Cryptography;
 using DTLib.Extensions;
-using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.зримое;
 using Млаумчерб.Клиент.классы;
 using static Млаумчерб.Клиент.сеть.Сеть;
 
@@ -73,12 +73,16 @@ public class LibrariesDownloadTaskFactory : INetworkTaskFactory
     private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
     {
         Приложение.Логгер.LogInfo(nameof(Сеть), $"started downloading libraries '{_descriptor.id}'");
-        ParallelOptions opt = new() { MaxDegreeOfParallelism = ParallelDownloadsN, CancellationToken = ct };
+        
+        ParallelOptions opt = new()
+        {
+            MaxDegreeOfParallelism = Приложение.Настройки.максимум_параллельных_загрузок,
+            CancellationToken = ct
+        };
         await Parallel.ForEachAsync(_libsToDownload, opt, async (l, _ct) =>
         {
-            Приложение.Логгер.LogDebug(nameof(Сеть), 
+            Приложение.Логгер.LogDebug(nameof(Сеть), $"downloading library '{l.name}' to '{l.jarFilePath}'");
-                $"downloading library '{l.name}' to '{l.jarFilePath}'");
+            await DownloadFile(l.artifact.url, l.jarFilePath, _ct, pr.AddBytesCount);
-            await DownloadFileHTTP(l.artifact.url, l.jarFilePath, _ct, pr.AddBytesCount);
             if (l is Libraries.NativeLib n)
             {
                 var zipf = File.OpenRead(n.jarFilePath);
@@ -96,6 +100,7 @@ public class LibrariesDownloadTaskFactory : INetworkTaskFactory
                 }
             }
         });
+        
         Приложение.Логгер.LogInfo(nameof(Сеть), $"finished downloading libraries '{_descriptor.id}'");
     }
 }

Млаумчерб.Клиент/сеть/NetworkTaskFactories/VersionFileDownloadTaskFactory.cs

@@ -1,6 +1,6 @@
 using System.Security.Cryptography;
 using DTLib.Extensions;
-using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.зримое;
 using Млаумчерб.Клиент.классы;
 using static Млаумчерб.Клиент.сеть.Сеть;
 
@@ -50,7 +50,7 @@ public class VersionFileDownloadTaskFactory : INetworkTaskFactory
     private async Task Download(NetworkProgressReporter pr, CancellationToken ct)
     {
         Приложение.Логгер.LogInfo(nameof(Сеть), $"started downloading version file '{_descriptor.id}'");
-        await DownloadFileHTTP(_descriptor.downloads.client.url, _filePath, ct, pr.AddBytesCount);
+        await DownloadFile(_descriptor.downloads.client.url, _filePath, ct, pr.AddBytesCount);
         Приложение.Логгер.LogInfo(nameof(Сеть), $"finished downloading version file '{_descriptor.id}'");
     }
 }

Млаумчерб.Клиент/сеть/Сеть.cs

@@ -1,53 +1,46 @@
-using System.Buffers;
+using System.Net.Http;
-using System.Net.Http;
+using System.Net.Http.Headers;
-using Млаумчерб.Клиент.видимое;
+using Млаумчерб.Клиент.зримое;
 using Млаумчерб.Клиент.классы;
 
 namespace Млаумчерб.Клиент.сеть;
 
 public static class Сеть
 {
-    public static int ParallelDownloadsN = 32;
+    private static HttpClient _http = new();
-    public static HttpClient http = new();
 
-    public static async Task DownloadFileHTTP(string url, IOPath outPath, CancellationToken ct = default,
+    static Сеть()
-        Action<ArraySegment<byte>>? transformFunc = null)
     {
-        await using var src = await http.GetStreamAsync(url, ct);
+        // thanks for Sashok :3
-        await using var dst = File.OpenWrite(outPath);
+        // https://github.com/new-sashok724/Launcher/blob/23485c3f7de6620d2c6b7b2dd9339c3beb6a0366/Launcher/source/helper/IOHelper.java#L259
-
+        _http.DefaultRequestHeaders.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)");
-        await src.CopyTransformAsync(dst, transformFunc, ct).ConfigureAwait(false);
     }
 
-    public static async Task CopyTransformAsync(this Stream src, Stream dst,
+    public static Task<string> GetString(string url, CancellationToken ct = default) => _http.GetStringAsync(url, ct);
-        Action<ArraySegment<byte>>? transformFunc = null, CancellationToken ct = default)
+    public static Task<Stream> GetStream(string url, CancellationToken ct = default) => _http.GetStreamAsync(url, ct);
+    
+    public static async Task DownloadFile(string url, Stream outStream, CancellationToken ct = default, 
+        params TransformStream.TransformFuncDelegate[] transforms)
     {
-        // default dotnet runtime buffer size
+        await using var pipe = new TransformStream(await GetStream(url, ct));
-        int bufferSize = 81920;
+        if (transforms.Length > 0) 
-        byte[] readBuffer = ArrayPool<byte>.Shared.Rent(bufferSize);
+            pipe.AddTransforms(transforms);
-        byte[] writeBuffer = ArrayPool<byte>.Shared.Rent(bufferSize);
+        await pipe.CopyToAsync(outStream, ct);
-        try
+    }
-        {
+    
-            var readTask = src.ReadAsync(readBuffer, 0, bufferSize, ct).ConfigureAwait(false);
+    public static async Task DownloadFile(string url, IOPath outPath, CancellationToken ct = default, 
-            while (true)
+        params TransformStream.TransformFuncDelegate[] transforms)
-            {
+    {
-                int readCount = await readTask;
+        await using var file = File.OpenWrite(outPath);
-                if (readCount == 0)
+        await DownloadFile(url, file, ct, transforms);
-                    break;
+    }
-                (readBuffer, writeBuffer) = (writeBuffer, readBuffer);
+    
-                readTask = src.ReadAsync(readBuffer, 0, bufferSize, ct).ConfigureAwait(false);
+    public static async Task<T> DownloadStringAndDeserialize<T>(string url)
-                transformFunc?.Invoke(new ArraySegment<byte>(writeBuffer, 0, readCount));
+    {
-                dst.Write(writeBuffer, 0, readCount);
+        var text = await _http.GetStringAsync(url);
-            }
+        var result = JsonConvert.DeserializeObject<T>(text)
-        }
+            ?? throw new Exception($"can't deserialize {typeof(T).Name}");
-        catch (OperationCanceledException)
+        return result;
-        {
-        }
-        finally
-        {
-            ArrayPool<byte>.Shared.Return(readBuffer);
-            ArrayPool<byte>.Shared.Return(writeBuffer);
-        }
     }
     
     private static readonly string[] VERSION_MANIFEST_URLS =
@@ -62,10 +55,8 @@ public static class Сеть
         {
             try
             {
-                var manifestText = await http.GetStringAsync(url);
+                var catalog = await DownloadStringAndDeserialize<GameVersionCatalog>(url);
-                var catalog = JsonConvert.DeserializeObject<GameVersionCatalog>(manifestText);
+                descriptors.AddRange(catalog.versions);
-                if (catalog != null)
-                    descriptors.AddRange(catalog.versions);
             }
             catch (Exception ex)
             {

млаумчерб.sln

@@ -4,7 +4,7 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Млаумчерб.Клие
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "SolutionFolder", "SolutionFolder", "{A3217C18-CC0D-4CE8-9C48-1BDEC1E1B333}"
 	ProjectSection(SolutionItems) = preProject
-		nuget.config = nuget.config
+		.gitignore = .gitignore
 	EndProjectSection
 EndProject
 Global