1 files changed, 26 insertions, 1 deletions
diff --git a/WebCore/fileapi/DOMFileSystem.cpp b/WebCore/fileapi/DOMFileSystem.cpp
index f38acaa..f4ebe7c 100644
--- a/WebCore/fileapi/DOMFileSystem.cpp
+++ b/WebCore/fileapi/DOMFileSystem.cpp
@@ -41,6 +41,7 @@
 #include "FileEntry.h"
 #include "FileSystemCallbacks.h"
 #include "FileWriter.h"
+#include "FileWriterBaseCallback.h"
 #include "FileWriterCallback.h"
 #include "MetadataCallback.h"
 #include "ScriptExecutionContext.h"
@@ -75,6 +76,29 @@ void DOMFileSystem::contextDestroyed()
     ActiveDOMObject::contextDestroyed();
 }
 
+namespace {
+
+class ConvertToFileWriterCallback : public FileWriterBaseCallback {
+public:
+    static PassRefPtr<ConvertToFileWriterCallback> create(PassRefPtr<FileWriterCallback> callback)
+    {
+        return adoptRef(new ConvertToFileWriterCallback(callback));
+    }
+
+    bool handleEvent(FileWriterBase* fileWriterBase)
+    {
+        return m_callback->handleEvent(static_cast<FileWriter*>(fileWriterBase));
+    }
+private:
+    ConvertToFileWriterCallback(PassRefPtr<FileWriterCallback> callback)
+        : m_callback(callback)
+    {
+    }
+    RefPtr<FileWriterCallback> m_callback;
+};
+
+}
+
 void DOMFileSystem::createWriter(const FileEntry* fileEntry, PassRefPtr<FileWriterCallback> successCallback, PassRefPtr<ErrorCallback> errorCallback)
 {
     ASSERT(fileEntry);
@@ -82,7 +106,8 @@ void DOMFileSystem::createWriter(const FileEntry* fileEntry, PassRefPtr<FileWrit
     String platformPath = m_asyncFileSystem->virtualToPlatformPath(fileEntry->fullPath());
 
     RefPtr<FileWriter> fileWriter = FileWriter::create(scriptExecutionContext());
-    OwnPtr<FileWriterCallbacks> callbacks = FileWriterCallbacks::create(fileWriter, successCallback, errorCallback);
+    RefPtr<FileWriterBaseCallback> conversionCallback = ConvertToFileWriterCallback::create(successCallback);
+    OwnPtr<FileWriterBaseCallbacks> callbacks = FileWriterBaseCallbacks::create(fileWriter, conversionCallback, errorCallback);
     m_asyncFileSystem->createWriter(fileWriter.get(), platformPath, callbacks.release());
 }