reorganizing a bit

CUETools.Compression.Zip/ZipCompressionProvider.cs

@@ -0,0 +1,61 @@
+using System;
+using System.IO;
+using System.Collections.Generic;
+using CUETools.Compression;
+using ICSharpCode.SharpZipLib.Zip;
+
+namespace CUETools.Compression.Zip
+{
+	[CompressionProviderClass("zip")]
+	public class ZipCompressionProvider : ICompressionProvider
+	{
+		private ZipFile _zipFile;
+
+		public ZipCompressionProvider(string path)
+		{
+			_zipFile = new ZipFile(path);
+		}
+
+		public void Close()
+		{
+			if (_zipFile != null) _zipFile.Close();
+			_zipFile = null;
+		}
+
+		~ZipCompressionProvider()
+		{
+			Close();
+		}
+
+		public Stream Decompress(string file)
+		{
+			ZipEntry zipEntry = _zipFile.GetEntry(file);
+			if (zipEntry == null)
+				throw new Exception("Archive entry not found.");
+			//if (zipEntry.IsCrypted && PasswordRequired != null)
+			//{
+			//    CompressionPasswordRequiredEventArgs e = new CompressionPasswordRequiredEventArgs();
+			//    PasswordRequired(this, e);
+			//    if (e.ContinueOperation && e.Password.Length > 0)
+			//        _zipFile.Password = e.Password;
+			//}
+			SeekableZipStream stream = new SeekableZipStream(_zipFile, zipEntry);
+			stream.PasswordRequired += PasswordRequired;
+			stream.ExtractionProgress += ExtractionProgress;
+			return stream;
+		}
+
+		public IEnumerable<string> Contents
+		{
+			get
+			{
+				foreach (ZipEntry e in _zipFile)
+					if (e.IsFile)
+						yield return (e.Name);
+			}
+		}
+
+		public event EventHandler<CompressionPasswordRequiredEventArgs> PasswordRequired;
+		public event EventHandler<CompressionExtractionProgressEventArgs> ExtractionProgress;
+	}
+}