Made resources index binary

Effectively removes System.Xml.Linq dependency

src/Avalonia.Base/Platform/Internal/AssemblyDescriptor.cs

@@ -32,7 +32,7 @@ internal class AssemblyDescriptor : IAssemblyDescriptor
                     Resources.Remove(Constants.AvaloniaResourceName);
 
                     var indexLength = new BinaryReader(resources).ReadInt32();
-                    var index = AvaloniaResourcesIndexReaderWriter.Read(new SlicedStream(resources, 4, indexLength));
+                    var index = AvaloniaResourcesIndexReaderWriter.ReadIndex(new SlicedStream(resources, 4, indexLength));
                     var baseOffset = indexLength + 4;
                     AvaloniaResources = index.ToDictionary(r => GetPathRooted(r), r => (IAssetDescriptor)
                         new AvaloniaResourceDescriptor(assembly, baseOffset + r.Offset, r.Size));

src/Avalonia.Base/Utilities/AvaloniaResourcesIndex.cs

@@ -1,105 +1,116 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Runtime.Serialization;
-using System.Xml.Linq;
-using System.Linq;
-using System.Diagnostics.CodeAnalysis;
+using System.Text;
 
 namespace Avalonia.Utilities
 {
-    #if !BUILDTASK
+#if !BUILDTASK
     public
-    #endif
+#endif
     static class AvaloniaResourcesIndexReaderWriter
     {
-        private const int LastKnownVersion = 1;
-        public static List<AvaloniaResourcesIndexEntry> Read(Stream stream)
+        private const int XmlLegacyVersion = 1;
+        private const int BinaryCurrentVersion = 2;
+
+        public static List<AvaloniaResourcesIndexEntry> ReadIndex(Stream stream)
         {
-            var ver = new BinaryReader(stream).ReadInt32();
-            if (ver > LastKnownVersion)
-                throw new Exception("Resources index format version is not known");
-
-            var assetDoc = XDocument.Load(stream);
-            XNamespace assetNs = assetDoc.Root!.Attribute("xmlns")!.Value;
-            List<AvaloniaResourcesIndexEntry> entries =         
-                (from entry in assetDoc.Root.Element(assetNs + "Entries")!.Elements(assetNs + "AvaloniaResourcesIndexEntry")
-                    select new AvaloniaResourcesIndexEntry
-                    {
-                        Path = entry.Element(assetNs + "Path")!.Value,
-                        Offset = int.Parse(entry.Element(assetNs + "Offset")!.Value),
-                        Size = int.Parse(entry.Element(assetNs + "Size")!.Value)                     
-                    }).ToList();
+            using var reader = new BinaryReader(stream, Encoding.UTF8, leaveOpen: true);
 
-            return entries;
+            var version = reader.ReadInt32();
+            return version switch
+            {
+                XmlLegacyVersion => ReadXmlIndex(),
+                BinaryCurrentVersion => ReadBinaryIndex(reader),
+                _ => throw new Exception($"Unknown resources index format version {version}")
+            };
         }
 
-        [RequiresUnreferencedCode("AvaloniaResources uses Data Contract Serialization, which might require unreferenced code")]
-        public static void Write(Stream stream, List<AvaloniaResourcesIndexEntry> entries)
+        private static List<AvaloniaResourcesIndexEntry> ReadXmlIndex()
+            => throw new NotSupportedException("Found legacy resources index format: please recompile your XAML files");
+
+        private static List<AvaloniaResourcesIndexEntry> ReadBinaryIndex(BinaryReader reader)
         {
-            new BinaryWriter(stream).Write(LastKnownVersion);
-            new DataContractSerializer(typeof(AvaloniaResourcesIndex)).WriteObject(stream,
-                new AvaloniaResourcesIndex()
-                {
-                    Entries = entries
+            var entryCount = reader.ReadInt32();
+            var entries = new List<AvaloniaResourcesIndexEntry>(entryCount);
+
+            for (var i = 0; i < entryCount; ++i)
+            {
+                entries.Add(new AvaloniaResourcesIndexEntry {
+                    Path = reader.ReadString(),
+                    Offset = reader.ReadInt32(),
+                    Size = reader.ReadInt32()
                 });
+            }
+
+            return entries;
         }
 
-        [RequiresUnreferencedCode("AvaloniaResources uses Data Contract Serialization, which might require unreferenced code")]
-        public static byte[] Create(Dictionary<string, byte[]> data)
+        public static void WriteIndex(Stream output, List<AvaloniaResourcesIndexEntry> entries)
         {
-            var sources = data.ToList();
-            var offsets = new Dictionary<string, int>();
-            var coffset = 0;
-            foreach (var s in sources)
+            using var writer = new BinaryWriter(output, Encoding.UTF8, leaveOpen: true);
+
+            WriteIndex(writer, entries);
+        }
+
+        private static void WriteIndex(BinaryWriter writer, List<AvaloniaResourcesIndexEntry> entries)
+        {
+            writer.Write(BinaryCurrentVersion);
+            writer.Write(entries.Count);
+
+            foreach (var entry in entries)
             {
-                offsets[s.Key] = coffset;
-                coffset += s.Value.Length;
+                writer.Write(entry.Path ?? string.Empty);
+                writer.Write(entry.Offset);
+                writer.Write(entry.Size);
             }
-            var index = sources.Select(s => new AvaloniaResourcesIndexEntry
-            {
-                Path = s.Key,
-                Size = s.Value.Length,
-                Offset = offsets[s.Key]
-            }).ToList();
-            var output = new MemoryStream();
-            var ms = new MemoryStream();
-            AvaloniaResourcesIndexReaderWriter.Write(ms, index);
-            new BinaryWriter(output).Write((int)ms.Length);
-            ms.Position = 0;
-            ms.CopyTo(output);
-            foreach (var s in sources)
+        }
+
+        public static void WriteResources(Stream output, List<(string Path, int Size, Func<Stream> Open)> resources)
+        {
+            var entries = new List<AvaloniaResourcesIndexEntry>(resources.Count);
+            var offset = 0;
+
+            foreach (var resource in resources)
             {
-                output.Write(s.Value,0,s.Value.Length);
+                entries.Add(new AvaloniaResourcesIndexEntry
+                {
+                    Path = resource.Path,
+                    Offset = offset,
+                    Size = resource.Size
+                });
+                offset += resource.Size;
             }
 
-            return output.ToArray();
-        }
-    }
+            using var writer = new BinaryWriter(output, Encoding.UTF8, leaveOpen: true);
+            writer.Write(0); // index size placeholder, overwritten below
 
-    [DataContract]
-#if !BUILDTASK
-    public
-#endif
-    class AvaloniaResourcesIndex
-    {       
-        [DataMember]
-        public List<AvaloniaResourcesIndexEntry> Entries { get; set; } = new List<AvaloniaResourcesIndexEntry>();
+            var posBeforeEntries = output.Position;
+            WriteIndex(writer, entries);
+
+            var posAfterEntries = output.Position;
+            var indexSize = (int) (posAfterEntries - posBeforeEntries);
+            output.Position = 0L;
+            writer.Write(indexSize);
+            output.Position = posAfterEntries;
+
+            foreach (var resource in resources)
+            {
+                using var resourceStream = resource.Open();
+                resourceStream.CopyTo(output);
+            }
+        }
     }
 
-    [DataContract]
 #if !BUILDTASK
     public
 #endif
     class AvaloniaResourcesIndexEntry
     {
-        [DataMember]
         public string? Path { get; set; }
-        
-        [DataMember]
+
         public int Offset { get; set; }
-        
-        [DataMember]
+
         public int Size { get; set; }
     }
 }

src/Avalonia.Build.Tasks/Avalonia.Build.Tasks.csproj

@@ -18,6 +18,9 @@
       <Compile Include="../Avalonia.Base/Utilities/AvaloniaResourcesIndex.cs">
         <Link>Shared/AvaloniaResourcesIndex.cs</Link>
       </Compile>
+      <Compile Include="../Avalonia.Base/Platform/Internal/Constants.cs">
+        <Link>Shared/Constants.cs</Link>
+      </Compile>
       <Compile Include="../Markup/Avalonia.Markup.Xaml/PortableXaml/AvaloniaResourceXamlInfo.cs">
         <Link>Shared/AvaloniaResourceXamlInfo.cs</Link>
       </Compile>

src/Avalonia.Build.Tasks/GenerateAvaloniaResourcesTask.cs

@@ -77,29 +77,9 @@ namespace Avalonia.Build.Tasks
 
         private void Pack(Stream output, List<Source> sources)
         {
-            var offsets = new Dictionary<Source, int>();
-            var coffset = 0;
-            foreach (var s in sources)
-            {
-                offsets[s] = coffset;
-                coffset += s.Size;
-            }
-            var index = sources.Select(s => new AvaloniaResourcesIndexEntry
-            {
-                Path = s.Path,
-                Size = s.Size,
-                Offset = offsets[s]
-            }).ToList();
-            var ms = new MemoryStream();
-            AvaloniaResourcesIndexReaderWriter.Write(ms, index);
-            new BinaryWriter(output).Write((int)ms.Length);
-            ms.Position = 0;
-            ms.CopyTo(output);
-            foreach (var s in sources)
-            {
-                using (var input = s.Open())
-                    input.CopyTo(output);
-            }
+            AvaloniaResourcesIndexReaderWriter.WriteResources(
+                output,
+                sources.Select(source => (source.Path, source.Size, (Func<Stream>) source.Open)).ToList());
         }
 
         private bool PreProcessXamlFiles(List<Source> sources)

src/Avalonia.Build.Tasks/XamlCompilerTaskExecutor.Helpers.cs

@@ -1,6 +1,8 @@
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using Avalonia.Platform.Internal;
 using Avalonia.Utilities;
 using Mono.Cecil;
 using Mono.Cecil.Cil;
@@ -34,13 +36,13 @@ namespace Avalonia.Build.Tasks
             {
                 _asm = asm;
                 _embedded = ((EmbeddedResource)asm.MainModule.Resources.FirstOrDefault(r =>
-                    r.ResourceType == ResourceType.Embedded && r.Name == "!AvaloniaResources"));
+                    r.ResourceType == ResourceType.Embedded && r.Name == Constants.AvaloniaResourceName));
                 if (_embedded == null)
                     return;
                 using (var stream = _embedded.GetResourceStream())
                 {
                     var br = new BinaryReader(stream);
-                    var index = AvaloniaResourcesIndexReaderWriter.Read(new MemoryStream(br.ReadBytes(br.ReadInt32())));
+                    var index = AvaloniaResourcesIndexReaderWriter.ReadIndex(new MemoryStream(br.ReadBytes(br.ReadInt32())));
                     var baseOffset = stream.Position;
                     foreach (var e in index)
                     {
@@ -61,9 +63,18 @@ namespace Avalonia.Build.Tasks
                 if (_resources.Count == 0)
                     return;
 
-                _embedded = new EmbeddedResource("!AvaloniaResources", ManifestResourceAttributes.Public,
-                    AvaloniaResourcesIndexReaderWriter.Create(_resources.ToDictionary(x => x.Key,
-                        x => x.Value.FileContents)));
+                var output = new MemoryStream();
+
+                AvaloniaResourcesIndexReaderWriter.WriteResources(
+                    output,
+                    _resources.Select(x => (
+                        Path: x.Key,
+                        Size: x.Value.FileContents.Length,
+                        Open: (Func<Stream>) (() => new MemoryStream(x.Value.FileContents))
+                    )).ToList());
+
+                output.Position = 0L;
+                _embedded = new EmbeddedResource(Constants.AvaloniaResourceName, ManifestResourceAttributes.Public, output);
                 _asm.MainModule.Resources.Add(_embedded);
             }