New OutputStream interface

runtime/bin/file_impl.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class _FileInputStream implements FileInputStream {
   _FileInputStream(File file) {
     _file = new File(file.name);
     _file.openSync();
   }
 
@@ skipping 55 matching lines @@
   File _file;
 }
 
 
 class _FileOutputStream implements FileOutputStream {
   _FileOutputStream(File file) {
     _file = new File(file.name);
     _file.openSync(true);
   }
 
-  bool write(List<int> buffer, int offset, int len, void callback()) {
+  bool write(List<int> buffer) {
+    return _write(buffer, 0, buffer.length);
+  }
+
+  bool writeFrom(List<int> buffer, [int offset, int len]) {
+    return _write(buffer, offset, (len == null) ? buffer.length : len);
+  }
+
+  void end() {
+    _file.closeSync();
+  }
+
+  void close() {
+    _file.closeSync();
+  }
+
+  void set noPendingWriteHandler(void callback()) {
+    // TODO(sgjesse): How to handle this?
+  }
+
+  void set closeHandler(void callback()) {
+    // TODO(sgjesse): How to handle this?
+  }
+
+  void set errorHandler(void callback()) {
+    // TODO(sgjesse): How to handle this?
+  }
+
+  bool _write(List<int> buffer, int offset, int len) {
     int bytesWritten = _file.writeListSync(buffer, offset, len);
-
     if (bytesWritten == len) {
       return true;
     } else {
       throw "FileOutputStream: write error";
     }
   }
 
-  void close() {
-    _file.closeSync();
-  }
-
   File _file;
 }
 
 
 // Class for encapsulating the native implementation of files.
 class _File implements File {
   // Constructor for file.
   _File(String this._name);
 
   void exists() {
@@ skipping 221 matching lines @@
 
   var _existsHandler;
   var _createHandler;
   var _openHandler;
   var _closeHandler;
   var _readByteHandler;
   var _readListHandler;
   var _noPendingWriteHandler;
   var _errorHandler;
 }