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

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+using System;
+using System.IO;
+
+namespace ICSharpCode.SharpZipLib.GZip
+{
+	using static Zip.Compression.Deflater;
+
+	/// <summary>
+	/// An example class to demonstrate compression and decompression of GZip streams.
+	/// </summary>
+	public static class GZip
+	{
+		/// <summary>
+		/// Decompress the <paramref name="inStream">input</paramref> writing
+		/// uncompressed data to the <paramref name="outStream">output stream</paramref>
+		/// </summary>
+		/// <param name="inStream">The readable stream containing data to decompress.</param>
+		/// <param name="outStream">The output stream to receive the decompressed data.</param>
+		/// <param name="isStreamOwner">Both streams are closed on completion if true.</param>
+		/// <exception cref="ArgumentNullException">Input or output stream is null</exception>
+		public static void Decompress(Stream inStream, Stream outStream, bool isStreamOwner)
+		{
+			if (inStream == null)
+				throw new ArgumentNullException(nameof(inStream), "Input stream is null");
+
+			if (outStream == null)
+				throw new ArgumentNullException(nameof(outStream), "Output stream is null");
+
+			try
+			{
+				using (GZipInputStream gzipInput = new GZipInputStream(inStream))
+				{
+					gzipInput.IsStreamOwner = isStreamOwner;
+					Core.StreamUtils.Copy(gzipInput, outStream, new byte[4096]);
+				}
+			}
+			finally
+			{
+				if (isStreamOwner)
+				{
+					// inStream is closed by the GZipInputStream if stream owner
+					outStream.Dispose();
+				}
+			}
+		}
+
+		/// <summary>
+		/// Compress the <paramref name="inStream">input stream</paramref> sending
+		/// result data to <paramref name="outStream">output stream</paramref>
+		/// </summary>
+		/// <param name="inStream">The readable stream to compress.</param>
+		/// <param name="outStream">The output stream to receive the compressed data.</param>
+		/// <param name="isStreamOwner">Both streams are closed on completion if true.</param>
+		/// <param name="bufferSize">Deflate buffer size, minimum 512</param>
+		/// <param name="level">Deflate compression level, 0-9</param>
+		/// <exception cref="ArgumentNullException">Input or output stream is null</exception>
+		/// <exception cref="ArgumentOutOfRangeException">Buffer Size is smaller than 512</exception>
+		/// <exception cref="ArgumentOutOfRangeException">Compression level outside 0-9</exception>
+		public static void Compress(Stream inStream, Stream outStream, bool isStreamOwner, int bufferSize = 512, int level = 6)
+		{
+			if (inStream == null)
+				throw new ArgumentNullException(nameof(inStream), "Input stream is null");
+
+			if (outStream == null)
+				throw new ArgumentNullException(nameof(outStream), "Output stream is null");
+
+			if (bufferSize < 512)
+				throw new ArgumentOutOfRangeException(nameof(bufferSize), "Deflate buffer size must be >= 512");
+
+			if (level < NO_COMPRESSION || level > BEST_COMPRESSION)
+				throw new ArgumentOutOfRangeException(nameof(level), "Compression level must be 0-9");
+
+			try
+			{
+				using (GZipOutputStream gzipOutput = new GZipOutputStream(outStream, bufferSize))
+				{
+					gzipOutput.SetLevel(level);
+					gzipOutput.IsStreamOwner = isStreamOwner;
+					Core.StreamUtils.Copy(inStream, gzipOutput, new byte[bufferSize]);
+				}
+			}
+			finally
+			{
+				if (isStreamOwner)
+				{
+					// outStream is closed by the GZipOutputStream if stream owner
+					inStream.Dispose();
+				}
+			}
+		}
+	}
+}