port from perforce

aiwaz/Backup/Aiwaz.Common/FileSystem.cs

@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Ionic.Zip;
+using System.IO;
+
+namespace Aiwaz.Common
+{
+    public class FileSystem : IDisposable
+    {
+        private ZipFile zipFile;
+        public FileSystem()
+        {
+            if (File.Exists("data.pak"))
+            {
+                zipFile = ZipFile.Read("data.pak");
+            }
+        }
+
+        ~FileSystem()
+        {
+            this.Dispose();
+        }
+
+        public Stream Open(string argFileName)
+        {
+            if (File.Exists(argFileName))
+            {
+                Stream fileStream = new FileStream(argFileName, FileMode.Open);
+                if (fileStream != null)
+                    return fileStream;
+            }
+
+            if (zipFile != null)
+            {
+                var file = zipFile[argFileName];
+                if (file != null)
+                {
+                    Stream outputStream = new MemoryStream();
+                    file.Extract(outputStream);
+                    return outputStream;
+                }
+            }
+
+            throw new FileNotFoundException(argFileName);
+        }
+
+        #region IDisposable Members
+
+        public void Dispose()
+        {
+            if (zipFile != null)
+            {
+                zipFile.Dispose();
+            }
+        }
+
+        #endregion
+    }
+
+    public static class BinaryReaderExtensions
+    {
+        public static string ReadNullTerminatedString(this BinaryReader reader)
+        {
+            string result = string.Empty;
+            char readChar = '\0';
+            do
+            {
+                readChar = reader.ReadChar();
+                if (readChar != '\0')
+                    result += readChar;
+            }
+            while (readChar != '\0');
+            return result;
+        }
+    }   
+
+}