ContentReader for Compressed (+read content for provider)

src/Tools/FileTime.Tools.Compression/ContentProvider/CompressedContentProvider.cs

@@ -1,22 +1,42 @@
-using System.Text;
-using FileTime.Core.ContentAccess;
+using FileTime.Core.ContentAccess;
 using FileTime.Core.Models;
 using FileTime.Core.Timeline;
+using SharpCompress.Archives;
 
 namespace FileTime.Tools.Compression.ContentProvider;
 
-public class CompressedContentProvider : SubContentProviderBase, ICompressedContentProvider
+public sealed class CompressedContentProvider : SubContentProviderBase, ICompressedContentProvider
 {
     public CompressedContentProvider(
-        IContentProvider parentContentProvider,
-        ITimelessContentProvider timelessContentProvider
+        ITimelessContentProvider timelessContentProvider,
+        IContentAccessorFactory contentAccessorFactory,
+        IContentProvider parentContentProvider
     )
-        : base(parentContentProvider, "compression", timelessContentProvider)
+        : base(
+            timelessContentProvider,
+            contentAccessorFactory,
+            parentContentProvider,
+            "compression")
     {
     }
 
-    public override Task<byte[]?> GetContentAsync(IElement element, int? maxLength = null, CancellationToken cancellationToken = default) 
-        => Task.FromResult((byte[]?)"Not implemented..."u8.ToArray());
+    public override async Task<byte[]?> GetContentAsync(IElement element, int? maxLength = null, CancellationToken cancellationToken = default)
+    {
+        var parentElementContext = await GetParentElementReaderAsync(element);
+        var reader = parentElementContext.ContentReader;
+        var subPath = parentElementContext.SubNativePath.Path;
+        
+        await using var readerStream = reader.AsStream();
+        using var archive = ArchiveFactory.Open(readerStream);
+        
+        var entry = archive.Entries.First(e => e.Key == subPath);
+        await using var contentReader= entry.OpenEntryStream();
+        
+        var data = new byte[1024 * 1024];
+        var readAsync = await contentReader.ReadAsync(data, cancellationToken);
+
+        return data[..readAsync].ToArray();
+    }
 
     public override VolumeSizeInfo? GetVolumeSizeInfo(FullName path) => throw new NotImplementedException();
 }