DevFS initial implementation

runtime/vm/dev_fs.h

Index: runtime/vm/dev_fs.h
diff --git a/runtime/vm/dev_fs.h b/runtime/vm/dev_fs.h
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+// Copyright (c) 2016, 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.
+
+#ifndef VM_DEV_FS_H_
+#define VM_DEV_FS_H_
+
+#include "vm/globals.h"
+
+#include "vm/dart_api_impl.h"
+
+namespace dart {
+
+class Array;
+class FileSystem;
+class JSONStream;
+class Mutex;
+class ObjectPointerVisitor;
+class RawArray;
+class RawObject;
+class String;
+
+
+// Manages dart-devfs:// file systems. These file systems are "virtual"
+// and accessed via the service protocol.
+class DevFS {
+ public:
+  static void Init();
+  static void Cleanup();
+
+  static void ListFileSystems(JSONStream* js);
+  static void CreateFileSystem(JSONStream* js, const String& fs_name);
+  static void DeleteFileSystem(JSONStream* js, const String& fs_name);
+  static void ListFiles(JSONStream* js,
+                        const String& fs_name);
+  static void WriteFiles(JSONStream* js,
+                         const String& fs_name,
+                         const Array& files);
+  static void WriteFile(JSONStream* js,
+                        const String& fs_name,
+                        const String& path,
+                        const String& file_contents);
+  // Does not assume that |file_contents| is a base64 encoded string.
+  static void WriteFileRaw(JSONStream* js,
+                           const String& fs_name,
+                           const String& path,
+                           const String& file_contents);
+  static void ReadFile(JSONStream* js,
+                       const String& fs_name,
+                       const String& path);
+
+  static Dart_Handle ReadFile(const char* fs_name,
+                              const char* path);
+
+  static Dart_Handle ReadFileAsString(const char* fs_name,
+                                      const char* path);
+
+  static Dart_Handle LibraryTagHandler(Dart_LibraryTag tag,
+                                       Dart_Handle library,
+                                       Dart_Handle url);
+
+ private:
+  static Mutex* mutex_;
+  static FileSystem* LookupFileSystem(const String& fs_name);
+  static FileSystem* LookupFileSystem(const char* fs_name);
+};
+
+}  // namespace dart
+
+#endif  // VM_DEV_FS_H_