Backport docs for System.IO.Compression.Brotli

src/libraries/System.IO.Compression.Brotli/src/System.IO.Compression.Brotli.csproj

@@ -1,8 +1,9 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Nullable>enable</Nullable>
     <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent)-Unix;$(NetCoreAppCurrent)</TargetFrameworks>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
   </PropertyGroup>
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>

src/libraries/System.IO.Compression.Brotli/src/System/IO/Compression/BrotliStream.cs

@@ -8,6 +8,7 @@
 
 namespace System.IO.Compression
 {
+    /// <summary>Provides methods and properties used to compress and decompress streams by using the Brotli data format specification.</summary>
     public sealed partial class BrotliStream : Stream
     {
         private const int DefaultInternalBufferSize = (1 << 16) - 16; //65520;
@@ -16,7 +17,14 @@ public sealed partial class BrotliStream : Stream
         private readonly bool _leaveOpen;
         private readonly CompressionMode _mode;
 
+        /// <summary>Initializes a new instance of the <see cref="System.IO.Compression.BrotliStream" /> class by using the specified stream and compression mode.</summary>
+        /// <param name="stream">The stream to compress.</param>
+        /// <param name="mode">One of the enumeration values that indicates whether to compress or decompress the stream.</param>
         public BrotliStream(Stream stream, CompressionMode mode) : this(stream, mode, leaveOpen: false) { }
+        /// <summary>Initializes a new instance of the <see cref="System.IO.Compression.BrotliStream" /> class by using the specified stream and compression mode, and optionally leaves the stream open.</summary>
+        /// <param name="stream">The stream to compress.</param>
+        /// <param name="mode">One of the enumeration values that indicates whether to compress or decompress the stream.</param>
+        /// <param name="leaveOpen"><see langword="true" /> to leave the stream open after the <see cref="System.IO.Compression.BrotliStream" /> object is disposed; otherwise, <see langword="false" />.</param>
         public BrotliStream(Stream stream, CompressionMode mode, bool leaveOpen)
         {
             if (stream == null)
@@ -48,6 +56,8 @@ private void EnsureNotDisposed()
                 throw new ObjectDisposedException(GetType().Name, SR.ObjectDisposed_StreamClosed);
         }
 
+        /// <summary>Releases the unmanaged resources used by the <see cref="System.IO.Compression.BrotliStream" /> and optionally releases the managed resources.</summary>
+        /// <param name="disposing"><see langword="true" /> to release both managed and unmanaged resources; <see langword="false" /> to release only unmanaged resources.</param>
         protected override void Dispose(bool disposing)
         {
             try
@@ -72,6 +82,11 @@ protected override void Dispose(bool disposing)
             }
         }
 
+        /// <summary>Asynchronously releases the unmanaged resources used by the <see cref="System.IO.Compression.BrotliStream" />.</summary>
+        /// <returns>A task that represents the asynchronous dispose operation.</returns>
+        /// <remarks>The `DisposeAsync` method lets you perform a resource-intensive dispose operation without blocking the main thread. This performance consideration is particularly important in a Windows 8.x Store app or desktop app where a time-consuming stream operation can block the UI thread and make your app appear as if it is not working. The async methods are used in conjunction with the <see langword="async" /> and <see langword="await" /> keywords in Visual Basic and C#.
+        /// This method disposes the Brotli stream by writing any changes to the backing store and closing the stream to release resources.
+        /// Calling `DisposeAsync` allows the resources used by the <see cref="System.IO.Compression.BrotliStream" /> to be reallocated for other purposes. For more information, see [Cleaning Up Unmanaged Resources](/dotnet/standard/garbage-collection/unmanaged).</remarks>
         public override async ValueTask DisposeAsync()
         {
             try
@@ -112,17 +127,39 @@ private void ReleaseStateForDispose()
             }
         }
 
+        /// <summary>Gets a reference to the underlying stream.</summary>
+        /// <value>A stream object that represents the underlying stream.</value>
+        /// <exception cref="System.ObjectDisposedException">The underlying stream is closed.</exception>
         public Stream BaseStream => _stream;
+        /// <summary>Gets a value indicating whether the stream supports reading while decompressing a file.</summary>
+        /// <value><see langword="true" /> if the <see cref="System.IO.Compression.CompressionMode" /> value is <see langword="Decompress," /> and the underlying stream supports reading and is not closed; otherwise, <see langword="false" />.</value>
         public override bool CanRead => _mode == CompressionMode.Decompress && _stream != null && _stream.CanRead;
+        /// <summary>Gets a value indicating whether the stream supports writing.</summary>
+        /// <value><see langword="true" /> if the <see cref="System.IO.Compression.CompressionMode" /> value is <see langword="Compress" />, and the underlying stream supports writing and is not closed; otherwise, <see langword="false" />.</value>
         public override bool CanWrite => _mode == CompressionMode.Compress && _stream != null && _stream.CanWrite;
+        /// <summary>Gets a value indicating whether the stream supports seeking.</summary>
+        /// <value><see langword="false" /> in all cases.</value>
         public override bool CanSeek => false;
+        /// <summary>This property is not supported and always throws a <see cref="System.NotSupportedException" />.</summary>
+        /// <param name="offset">The location in the stream.</param>
+        /// <param name="origin">One of the <see cref="System.IO.SeekOrigin" /> values.</param>
+        /// <returns>A long value.</returns>
+        /// <exception cref="System.NotSupportedException">This property is not supported on this stream.</exception>
         public override long Seek(long offset, SeekOrigin origin) => throw new NotSupportedException();
+        /// <summary>This property is not supported and always throws a <see cref="System.NotSupportedException" />.</summary>
+        /// <value>A long value.</value>
+        /// <exception cref="System.NotSupportedException">This property is not supported on this stream.</exception>
         public override long Length => throw new NotSupportedException();
+        /// <summary>This property is not supported and always throws a <see cref="System.NotSupportedException" />.</summary>
+        /// <value>A long value.</value>
+        /// <exception cref="System.NotSupportedException">This property is not supported on this stream.</exception>
         public override long Position
         {
             get => throw new NotSupportedException();
             set => throw new NotSupportedException();
         }
+        /// <summary>This property is not supported and always throws a <see cref="System.NotSupportedException" />.</summary>
+        /// <param name="value">The length of the stream.</param>
         public override void SetLength(long value) => throw new NotSupportedException();
 
         private int _activeAsyncOperation; // 1 == true, 0 == false

src/libraries/System.IO.Compression.Brotli/src/System/IO/Compression/dec/BrotliDecoder.cs

@@ -8,6 +8,7 @@
 
 namespace System.IO.Compression
 {
+    /// <summary>Provides non-allocating, performant Brotli decompression methods. The methods decompress in a single pass without using a <see cref="System.IO.Compression.BrotliStream" /> instance.</summary>
     public struct BrotliDecoder : IDisposable
     {
         private SafeBrotliDecoderHandle? _state;
@@ -27,6 +28,7 @@ internal void EnsureInitialized()
                 InitializeDecoder();
         }
 
+        /// <summary>Releases all resources used by the current Brotli decoder instance.</summary>
         public void Dispose()
         {
             _disposed = true;
@@ -39,6 +41,17 @@ private void EnsureNotDisposed()
                 throw new ObjectDisposedException(nameof(BrotliDecoder), SR.BrotliDecoder_Disposed);
         }
 
+        /// <summary>Decompresses data that was compressed using the Brotli algorithm.</summary>
+        /// <param name="source">A buffer containing the compressed data.</param>
+        /// <param name="destination">When this method returns, a byte span containing the decompressed data.</param>
+        /// <param name="bytesConsumed">The total number of bytes that were read from <paramref name="source" />.</param>
+        /// <param name="bytesWritten">The total number of bytes that were written in the <paramref name="destination" />.</param>
+        /// <returns>One of the enumeration values that indicates the status of the decompression operation.</returns>
+        /// <remarks>The return value can be as follows:
+        /// - <see cref="System.Buffers.OperationStatus.Done" />: <paramref name="source" /> was successfully and completely decompressed into <paramref name="destination" />.
+        /// - <see cref="System.Buffers.OperationStatus.DestinationTooSmall" />: There is not enough space in <paramref name="destination" /> to decompress <paramref name="source" />.
+        /// - <see cref="System.Buffers.OperationStatus.NeedMoreData" />: The decompression action is partially done at least one more byte is required to complete the decompression task. This method should be called again with more input to decompress.
+        /// - <see cref="System.Buffers.OperationStatus.InvalidData" />: The data in <paramref name="source" /> is invalid and could not be decompressed.</remarks>
         public OperationStatus Decompress(ReadOnlySpan<byte> source, Span<byte> destination, out int bytesConsumed, out int bytesWritten)
         {
             EnsureInitialized();
@@ -92,6 +105,12 @@ public OperationStatus Decompress(ReadOnlySpan<byte> source, Span<byte> destinat
             }
         }
 
+        /// <summary>Attempts to decompress data that was compressed with the Brotli algorithm.</summary>
+        /// <param name="source">A buffer containing the compressed data.</param>
+        /// <param name="destination">When this method returns, a byte span containing the decompressed data.</param>
+        /// <param name="bytesWritten">The total number of bytes that were written in the <paramref name="destination" />.</param>
+        /// <returns><see langword="true" /> on success; <see langword="false" /> otherwise.</returns>
+        /// <remarks>If this method returns <see langword="false" />, <paramref name="destination" /> may be empty or contain partially decompressed data, with <paramref name="bytesWritten" /> being zero or greater than zero but less than the expected total.</remarks>
         public static unsafe bool TryDecompress(ReadOnlySpan<byte> source, Span<byte> destination, out int bytesWritten)
         {
             fixed (byte* inBytes = &MemoryMarshal.GetReference(source))