diff --git a/src/os/file.php b/src/os/file.php
index e42749b..40d09f1 100644
--- a/src/os/file.php
+++ b/src/os/file.php
@@ -3,7 +3,9 @@ namespace nur\sery\os;
 
 use nur\sery\os\file\FileReader;
 use nur\sery\os\file\FileWriter;
+use nur\sery\os\file\MemoryStream;
 use nur\sery\os\file\SharedFile;
+use nur\sery\os\file\TempStream;
 use nur\sery\os\file\TmpfileWriter;
 
 /**
@@ -11,47 +13,74 @@ use nur\sery\os\file\TmpfileWriter;
  */
 class file {
   static function reader($input, ?callable $func=null): FileReader {
-    $reader = new FileReader($input);
+    $file = new FileReader($input);
     if ($func !== null) {
       try {
-        $func($reader);
+        $func($file);
       } finally {
-        $reader->close();
+        $file->close();
       }
     }
+    return $file;
   }
   
   static function writer($output, ?callable $func=null): FileWriter {
-    $writer = new FileWriter($output);
+    $file = new FileWriter($output);
     if ($func !== null) {
       try {
-        $func($writer);
+        $func($file);
       } finally {
-        $writer->close();
-      }
-    }
-  }
-  
-  static function tmpwriter($destdir=null, ?callable $func=null): TmpfileWriter {
-    $tmpwriter = new TmpfileWriter($destdir);
-    if ($func !== null) {
-      try {
-        $func($tmpwriter);
-      } finally {
-        $tmpwriter->close();
+        $file->close();
       }
     }
+    return $file;
   }
 
   static function shared($file, ?callable $func=null): SharedFile {
-    $shared  = new SharedFile($file);
+    $file  = new SharedFile($file);
     if ($func !== null) {
       try {
-        $func($shared);
+        $func($file);
       } finally {
-        $shared ->close();
+        $file ->close();
       }
     }
+    return $file;
   }
 
+  static function tmpwriter($destdir=null, ?callable $func=null): TmpfileWriter {
+    $file = new TmpfileWriter($destdir);
+    if ($func !== null) {
+      try {
+        $func($file);
+      } finally {
+        $file->close();
+      }
+    }
+    return $file;
+  }
+
+  static function memory(?callable $func=null): MemoryStream {
+    $file = new MemoryStream();
+    if ($func !== null) {
+      try {
+        $func($file);
+      } finally {
+        $file->close();
+      }
+    }
+    return $file;
+  }
+
+  static function temp(?callable $func=null): TempStream {
+    $file = new TempStream();
+    if ($func !== null) {
+      try {
+        $func($file);
+      } finally {
+        $file->close();
+      }
+    }
+    return $file;
+  }
 }