Added EPUB plugin

QuickLook.Plugin/VersOne.Epub/Utils/XmlUtils.cs

@@ -0,0 +1,28 @@
+using System.IO;
+using System.Threading.Tasks;
+using System.Xml;
+using System.Xml.Linq;
+
+namespace VersOne.Epub.Internal
+{
+    internal static class XmlUtils
+    {
+        public static async Task<XDocument> LoadDocumentAsync(Stream stream)
+        {
+            using (MemoryStream memoryStream = new MemoryStream())
+            {
+                await stream.CopyToAsync(memoryStream).ConfigureAwait(false);
+                memoryStream.Position = 0;
+                XmlReaderSettings xmlReaderSettings = new XmlReaderSettings
+                {
+                    DtdProcessing = DtdProcessing.Ignore,
+                    Async = true
+                };
+                using (XmlReader xmlReader = XmlReader.Create(memoryStream, xmlReaderSettings))
+                {
+                    return await Task.Run(() => XDocument.Load(memoryStream)).ConfigureAwait(false);
+                }
+            }
+        }
+    }
+}

QuickLook.Plugin/VersOne.Epub/Utils/ZipPathUtils.cs

@@ -0,0 +1,32 @@
+using System;
+
+namespace VersOne.Epub.Internal
+{
+    internal static class ZipPathUtils
+    {
+        public static string GetDirectoryPath(string filePath)
+        {
+            int lastSlashIndex = filePath.LastIndexOf('/');
+            if (lastSlashIndex == -1)
+            {
+                return String.Empty;
+            }
+            else
+            {
+                return filePath.Substring(0, lastSlashIndex);
+            }
+        }
+
+        public static string Combine(string directory, string fileName)
+        {
+            if (String.IsNullOrEmpty(directory))
+            {
+                return fileName;
+            }
+            else
+            {
+                return String.Concat(directory, "/", fileName);
+            }
+        }
+    }
+}