review fixes

src/SharpCompress/Compressors/ADC/ADCBase.cs

@@ -129,7 +129,7 @@ public static class ADCBase
         {
             result.BytesRead = 0;
             result.Output = null;
-            return await Task.FromResult(result);
+            return result;
         }
 
         var start = (int)input.Position;

src/SharpCompress/Compressors/ADC/ADCStream.cs

@@ -256,7 +256,7 @@ public sealed class ADCStream : Stream, IStreamStack
         _outPosition += toCopy;
         _position += toCopy;
         copied += toCopy;
-        return await Task.FromResult(copied);
+        return copied;
     }
 
     public override long Seek(long offset, SeekOrigin origin) => throw new NotSupportedException();

src/SharpCompress/Compressors/BZip2/CBZip2InputStream.cs

@@ -1129,7 +1129,7 @@ internal class CBZip2InputStream : Stream, IStreamStack
         return k;
     }
 
-    public override async Task<int> ReadAsync(
+    public override Task<int> ReadAsync(
         byte[] buffer,
         int offset,
         int count,
@@ -1148,7 +1148,7 @@ internal class CBZip2InputStream : Stream, IStreamStack
             }
             buffer[k + offset] = (byte)c;
         }
-        return await Task.FromResult(k);
+        return Task.FromResult(k);
     }
 
     public override long Seek(long offset, SeekOrigin origin) => 0;

src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs

@@ -2024,7 +2024,7 @@ internal sealed class CBZip2OutputStream : Stream, IStreamStack
         }
     }
 
-    public override async Task WriteAsync(
+    public override Task WriteAsync(
         byte[] buffer,
         int offset,
         int count,
@@ -2036,7 +2036,7 @@ internal sealed class CBZip2OutputStream : Stream, IStreamStack
             cancellationToken.ThrowIfCancellationRequested();
             WriteByte(buffer[k + offset]);
         }
-        await Task.CompletedTask;
+        return Task.CompletedTask;
     }
 
     public override bool CanRead => false;

src/SharpCompress/Writers/Zip/ZipWriter.cs

@@ -160,7 +160,7 @@ public class ZipWriter : AbstractWriter
         WriteDirectoryEntry(normalizedName, options);
     }
 
-    public override async Task WriteDirectoryAsync(
+    public override Task WriteDirectoryAsync(
         string directoryName,
         DateTime? modificationTime,
         CancellationToken cancellationToken = default
@@ -168,7 +168,7 @@ public class ZipWriter : AbstractWriter
     {
         // Synchronous implementation is sufficient for directory entries
         WriteDirectory(directoryName, modificationTime);
-        await Task.CompletedTask.ConfigureAwait(false);
+        return Task.CompletedTask;
     }
 
     private void WriteDirectoryEntry(string directoryPath, ZipWriterEntryOptions options)

tests/SharpCompress.Test/AdcAsyncTest.cs

@@ -51,7 +51,7 @@ public class AdcAsyncTest : TestBase
         using var cmpFs = File.OpenRead(Path.Combine(TEST_ARCHIVES_PATH, "adc_compressed.bin"));
         using var decStream = new ADCStream(cmpFs);
         var test = new byte[512];
-        var cts = new System.Threading.CancellationTokenSource();
+        using var cts = new System.Threading.CancellationTokenSource();
 
         // Read should complete without cancellation
         var bytesRead = await decStream.ReadAsync(test, 0, test.Length, cts.Token);

tests/SharpCompress.Test/BZip2/BZip2StreamAsyncTests.cs

@@ -117,7 +117,7 @@ public class BZip2StreamAsyncTests
             )
             {
                 var buffer = new byte[1024];
-                var cts = new System.Threading.CancellationTokenSource();
+                using var cts = new System.Threading.CancellationTokenSource();
 
                 // Read should complete without cancellation
                 var bytesRead = await bzip2Stream.ReadAsync(buffer, 0, buffer.Length, cts.Token);