Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System/sys/system/IO/compression/CompressionLevel.cs

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+///------------------------------------------------------------------------------
+/// <copyright file="CompressionLevel.cs" company="Microsoft">
+///     Copyright (c) Microsoft Corporation.  All rights reserved.
+/// </copyright>                               
+///
+/// <owner>gpaperin</owner>
+///------------------------------------------------------------------------------
+
+
+namespace System.IO.Compression {
+
+    /// <summary>
+    /// Defines a tradeoff between fast vs. strong compression. The specific meaning depends of the Deflater implementation.
+    /// </summary>
+    
+    // This is an abstract concept and NOT the ZLib compression level.
+    // There may or may not be any correspondance with the a possible implementation-specific level-parameter of the deflater.
+    public enum CompressionLevel {
+
+        Optimal = 0,
+        Fastest = 1,
+        NoCompression = 2
+
+    }  // internal enum CompressionLevel
+
+}  // namespace System.IO.Compression
+
+// CompressionLevel.cs