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常用工具集/Utility/ICSharpCode.SharpZipLib/Zip/ZipEntryExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ICSharpCode.SharpZipLib.Zip
+{
+	/// <summary>
+	/// General ZipEntry helper extensions
+	/// </summary>
+	public static class ZipEntryExtensions
+	{
+		/// <summary>
+		/// Efficiently check if a <see cref="GeneralBitFlags">flag</see> is set without enum un-/boxing
+		/// </summary>
+		/// <param name="entry"></param>
+		/// <param name="flag"></param>
+		/// <returns>Returns whether the flag was set</returns>
+		public static bool HasFlag(this ZipEntry entry, GeneralBitFlags flag)
+			=> (entry.Flags & (int) flag) != 0;
+
+		/// <summary>
+		/// Efficiently set a <see cref="GeneralBitFlags">flag</see> without enum un-/boxing
+		/// </summary>
+		/// <param name="entry"></param>
+		/// <param name="flag"></param>
+		/// <param name="enabled">Whether the passed flag should be set (1) or cleared (0)</param>
+		public static void SetFlag(this ZipEntry entry, GeneralBitFlags flag, bool enabled = true)
+			=> entry.Flags = enabled 
+				? entry.Flags | (int) flag 
+				: entry.Flags & ~(int) flag;
+	}
+}