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常用工具集/Utility/ICSharpCode.SharpZipLib/BZip2/BZip2.cs

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+using System;
+using System.IO;
+
+namespace ICSharpCode.SharpZipLib.BZip2
+{
+	/// <summary>
+	/// An example class to demonstrate compression and decompression of BZip2 streams.
+	/// </summary>
+	public static class BZip2
+	{
+		/// <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>
+		public static void Decompress(Stream inStream, Stream outStream, bool isStreamOwner)
+		{
+			if (inStream == null)
+				throw new ArgumentNullException(nameof(inStream));
+
+			if (outStream == null)
+				throw new ArgumentNullException(nameof(outStream));
+
+			try
+			{
+				using (BZip2InputStream bzipInput = new BZip2InputStream(inStream))
+				{
+					bzipInput.IsStreamOwner = isStreamOwner;
+					Core.StreamUtils.Copy(bzipInput, outStream, new byte[4096]);
+				}
+			}
+			finally
+			{
+				if (isStreamOwner)
+				{
+					// inStream is closed by the BZip2InputStream 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="level">Block size acts as compression level (1 to 9) with 1 giving
+		/// the lowest compression and 9 the highest.</param>
+		public static void Compress(Stream inStream, Stream outStream, bool isStreamOwner, int level)
+		{
+			if (inStream == null)
+				throw new ArgumentNullException(nameof(inStream));
+
+			if (outStream == null)
+				throw new ArgumentNullException(nameof(outStream));
+
+			try
+			{
+				using (BZip2OutputStream bzipOutput = new BZip2OutputStream(outStream, level))
+				{
+					bzipOutput.IsStreamOwner = isStreamOwner;
+					Core.StreamUtils.Copy(inStream, bzipOutput, new byte[4096]);
+				}
+			}
+			finally
+			{
+				if (isStreamOwner)
+				{
+					// outStream is closed by the BZip2OutputStream if stream owner
+					inStream.Dispose();
+				}
+			}
+		}
+	}
+}