fix Exif rotation in ImageViewer; WIP on archive viewer

QuickLook.Plugin.ArchiveViewer/Plugin.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Windows;
+using SharpCompress.Archives.SevenZip;
+using SharpCompress.Common;
+using SharpCompress.Readers;
+
+namespace QuickLook.Plugin.ArchiveViewer
+{
+    public class Plugin : IViewer
+    {
+        public int Priority => 0;
+
+        public bool CanHandle(string path)
+        {
+            if (Directory.Exists(path))
+                return false;
+
+            using (var s = File.OpenRead(path))
+            {
+                // The 7Zip format doesn't allow for reading as a forward-only stream so 
+                // 7Zip is only supported through the Archive API.
+                if (SevenZipArchive.IsSevenZipFile(s))
+                    return true;
+
+                s.Seek(0, SeekOrigin.Begin);
+                try
+                {
+                    ReaderFactory.Open(s);
+                }
+                catch (InvalidOperationException)
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        public void Prepare(string path, ViewContentContainer container)
+        {
+            container.PreferedSize = new Size {Width = 800, Height = 600};
+        }
+
+        public void View(string path, ViewContentContainer container)
+        {
+            var files = new List<IEntry>();
+
+            if (SevenZipArchive.IsSevenZipFile(path))
+                GetItemsFromSevenZip(path, files);
+            else
+                GetItemsFromIReader(path, files);
+        }
+
+        public void Close()
+        {
+            throw new NotImplementedException();
+        }
+
+        private void GetItemsFromSevenZip(string path, List<IEntry> files)
+        {
+            using (var s = File.OpenRead(path))
+            {
+                using (var reader = SevenZipArchive.Open(s))
+                {
+                    foreach (var entry in reader.Entries)
+                        files.Add(entry);
+                }
+            }
+        }
+
+        private void GetItemsFromIReader(string path, List<IEntry> files)
+        {
+            using (var s = File.OpenRead(path))
+            {
+                using (var reader = ReaderFactory.Open(s))
+                {
+                    while (reader.MoveToNextEntry())
+                        files.Add(reader.Entry);
+                }
+            }
+        }
+    }
+}