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常用工具集/Utility/ICSharpCode.SharpZipLib/GZip/GZipConstants.cs

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+using System;
+using System.Text;
+
+namespace ICSharpCode.SharpZipLib.GZip
+{
+	/// <summary>
+	/// This class contains constants used for gzip.
+	/// </summary>
+	[System.Diagnostics.CodeAnalysis.SuppressMessage("Naming", "CA1707:Identifiers should not contain underscores", Justification = "kept for backwards compatibility")]
+	sealed public class GZipConstants
+	{
+		/// <summary>
+		/// First GZip identification byte
+		/// </summary>
+		public const byte ID1 = 0x1F;
+
+		/// <summary>
+		/// Second GZip identification byte
+		/// </summary>
+		public const byte ID2 = 0x8B;
+
+		/// <summary>
+		/// Deflate compression method
+		/// </summary>
+		public const byte CompressionMethodDeflate = 0x8;
+
+		/// <summary>
+		/// Get the GZip specified encoding (CP-1252 if supported, otherwise ASCII)
+		/// </summary>
+		public static Encoding Encoding
+		{
+			get
+			{
+				try
+				{
+					return Encoding.GetEncoding(1252);
+				}
+				catch
+				{
+					return Encoding.ASCII;
+				}
+			}
+		}
+
+	}
+
+	/// <summary>
+	/// GZip header flags
+	/// </summary>
+	[Flags]
+	public enum GZipFlags: byte
+	{
+		/// <summary>
+		/// Text flag hinting that the file is in ASCII
+		/// </summary>
+		FTEXT = 0x1 << 0,
+
+		/// <summary>
+		/// CRC flag indicating that a CRC16 preceeds the data
+		/// </summary>
+		FHCRC = 0x1 << 1,
+
+		/// <summary>
+		/// Extra flag indicating that extra fields are present
+		/// </summary>
+		FEXTRA = 0x1 << 2,
+
+		/// <summary>
+		/// Filename flag indicating that the original filename is present
+		/// </summary>
+		FNAME = 0x1 << 3,
+
+		/// <summary>
+		/// Flag bit mask indicating that a comment is present
+		/// </summary>
+		FCOMMENT = 0x1 << 4,
+	}
+}