Issue 771, remove throw on flush for readonly streams

src/SharpCompress/Common/Rar/RarCryptoWrapper.cs

@@ -17,7 +17,7 @@ public RarCryptoWrapper(Stream actualStream, byte[] salt, ICryptKey key)
         _rijndael = new BlockTransformer(key.Transformer(salt));
     }
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Seek(long offset, SeekOrigin origin) => throw new NotSupportedException();
 

src/SharpCompress/Common/SevenZip/ArchiveReader.cs

@@ -1393,7 +1393,7 @@ public FolderUnpackStream(ArchiveDatabase db, int p, int startIndex, List<bool>
 
         public override bool CanWrite => false;
 
-        public override void Flush() => throw new NotSupportedException();
+        public override void Flush() { }
 
         public override long Length => throw new NotSupportedException();
 

src/SharpCompress/Common/Tar/TarReadOnlySubStream.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 using SharpCompress.IO;
 
@@ -47,7 +47,7 @@ protected override void Dispose(bool disposing)
 
     public override bool CanWrite => false;
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => throw new NotSupportedException();
 

src/SharpCompress/Common/Zip/PkwareTraditionalCryptoStream.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 
 namespace SharpCompress.Common.Zip;
@@ -87,10 +87,7 @@ public override void Write(byte[] buffer, int offset, int count)
         _stream.Write(encrypted, 0, encrypted.Length);
     }
 
-    public override void Flush()
-    {
-        //throw new NotSupportedException();
-    }
+    public override void Flush() { }
 
     public override long Seek(long offset, SeekOrigin origin) => throw new NotSupportedException();
 

src/SharpCompress/Common/Zip/WinzipAesCryptoStream.cs

@@ -73,7 +73,7 @@ protected override void Dispose(bool disposing)
         }
     }
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override int Read(byte[] buffer, int offset, int count)
     {

src/SharpCompress/Compressors/Filters/BCJ2Filter.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 
 namespace SharpCompress.Compressors.Filters;
@@ -79,7 +79,7 @@ protected override void Dispose(bool disposing)
 
     public override bool CanWrite => false;
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => _baseStream.Length + _data1.Length + _data2.Length;
 

src/SharpCompress/Compressors/Filters/Filter.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 
 namespace SharpCompress.Compressors.Filters;
@@ -40,7 +40,7 @@ protected override void Dispose(bool disposing)
 
     public override bool CanWrite => _isEncoder;
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => _baseStream.Length;
 

src/SharpCompress/Compressors/LZMA/DecoderStream.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 using SharpCompress.Common.SevenZip;
 using SharpCompress.Compressors.LZMA.Utilites;
@@ -14,7 +14,7 @@ internal abstract class DecoderStream2 : Stream
 
     public override bool CanWrite => false;
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => throw new NotSupportedException();
 

src/SharpCompress/Compressors/Rar/MultiVolumeReadOnlyStream.cs

@@ -130,7 +130,7 @@ public override int Read(byte[] buffer, int offset, int count)
 
     public byte[] CurrentCrc { get; private set; }
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => throw new NotSupportedException();
 

src/SharpCompress/Compressors/Xz/ReadOnlyStream.cs

@@ -1,4 +1,4 @@
-#nullable disable
+#nullable disable
 
 using System;
 using System.IO;
@@ -23,7 +23,7 @@ public override long Position
         set => throw new NotSupportedException();
     }
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Seek(long offset, SeekOrigin origin) => throw new NotSupportedException();
 

src/SharpCompress/IO/BufferedSubStream.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 
 namespace SharpCompress.IO;
@@ -26,7 +26,7 @@ public BufferedSubStream(Stream stream, long origin, long bytesToRead)
 
     public override bool CanWrite => false;
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => BytesLeftToRead;
 

src/SharpCompress/IO/DataDescriptorStream.cs

@@ -45,7 +45,7 @@ protected override void Dispose(bool disposing)
 
     public override bool CanWrite => false;
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => _stream.Length;
 

src/SharpCompress/IO/ReadOnlySubStream.cs

@@ -29,7 +29,7 @@ public ReadOnlySubStream(Stream stream, long? origin, long bytesToRead)
 
     public override bool CanWrite => false;
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => throw new NotSupportedException();
 

src/SharpCompress/IO/RewindableStream.cs

@@ -75,7 +75,7 @@ public void StartRecording()
 
     public override bool CanWrite => false;
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => stream.Length;
 

tests/SharpCompress.Test/Mocks/FlushOnDisposeStream.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 
 namespace SharpCompress.Test.Mocks;
@@ -27,7 +27,7 @@ public override long Position
         set => inner.Position = value;
     }
 
-    public override void Flush() => throw new NotImplementedException();
+    public override void Flush() { }
 
     public override int Read(byte[] buffer, int offset, int count) =>
         inner.Read(buffer, offset, count);

tests/SharpCompress.Test/Mocks/ForwardOnlyStream.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.IO;
 
 namespace SharpCompress.Test.Mocks;
@@ -29,7 +29,7 @@ protected override void Dispose(bool disposing)
     public override bool CanSeek => false;
     public override bool CanWrite => false;
 
-    public override void Flush() => throw new NotSupportedException();
+    public override void Flush() { }
 
     public override long Length => throw new NotSupportedException();