Added Files

PepLib.Core/ZipHelper.cs

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+using Ionic.Zip;
+using System.Collections.Generic;
+using System.IO;
+using System.Text.RegularExpressions;
+
+namespace PepLib
+{
+    public static class ZipHelper
+    {
+        /// <summary>
+        /// Returns the files that match the specified pattern.
+        /// </summary>
+        /// <param name="file">Input zip file.</param>
+        /// <param name="pattern">Pattern to match.</param>
+        /// <param name="names">Names of the files that match the pattern.</param>
+        /// <param name="streams">Data of the files that match the pattern.</param>
+        /// <returns></returns>
+        public static int ExtractByPattern(string file, string pattern, out string[] names, out Stream[] streams)
+        {
+            var fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
+            var zipStream = new ZipInputStream(fileStream);
+            var nameList = new List<string>();
+            var streamList = new List<Stream>();
+
+            ZipEntry theEntry;
+
+            while ((theEntry = zipStream.GetNextEntry()) != null)
+            {
+                if (!Regex.IsMatch(theEntry.FileName, pattern))
+                    continue;
+
+                nameList.Add(theEntry.FileName);
+
+                var memstream = new MemoryStream();
+                var size = 2048;
+                var data = new byte[size];
+
+                while (true)
+                {
+                    size = zipStream.Read(data, 0, data.Length);
+
+                    if (size > 0)
+                    {
+                        memstream.Write(data, 0, size);
+                        memstream.Flush();
+                    }
+                    else break;
+                }
+
+                memstream.Seek(0, SeekOrigin.Begin);
+                streamList.Add(memstream);
+            }
+
+            zipStream.Close();
+
+            names = nameList.ToArray();
+            streams = streamList.ToArray();
+
+            return streams.Length;
+        }
+
+        /// <summary>
+        /// Returns the first file found that matches the specified file extension.
+        /// </summary>
+        /// <param name="file">Input zip file.</param>
+        /// <param name="extension">Extension to match.</param>
+        /// <param name="name">The name of the file that matches the file extension.</param>
+        /// <param name="stream">The data of the file that matches the file extension.</param>
+        /// <returns></returns>
+        public static bool ExtractByExtension(string file, string extension, out string name, out Stream stream)
+        {
+            var fileStream = new FileStream(file, FileMode.Open, FileAccess.Read);
+            var zipStream = new ZipInputStream(fileStream);
+            var memstream = new MemoryStream();
+
+            ZipEntry theEntry;
+
+            while ((theEntry = zipStream.GetNextEntry()) != null)
+            {
+                if (Path.GetExtension(theEntry.FileName) != extension)
+                    continue;
+
+                int size = 2048;
+                var data = new byte[size];
+
+                while (true)
+                {
+                    size = zipStream.Read(data, 0, data.Length);
+
+                    if (size > 0)
+                    {
+                        memstream.Write(data, 0, size);
+                        memstream.Flush();
+                    }
+                    else break;
+                }
+
+                zipStream.Close();
+                memstream.Seek(0, SeekOrigin.Begin);
+
+                stream = memstream;
+                name = theEntry.FileName;
+
+                return true;
+            }
+
+            zipStream.Close();
+            memstream.Close();
+
+            stream = null;
+            name = null;
+
+            return false;
+        }
+    }
+}