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diff --git a/src/support/file.h b/src/support/file.h
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+++ b/src/support/file.h
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+/*
+ * Copyright 2015 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+// FIle helpers.
+//
+
+#ifndef wasm_support_file_h
+#define wasm_support_file_h
+
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <utility>
+
+namespace wasm {
+std::string read_file(const std::string &filename, bool debug);
+
+class Output {
+ public:
+  // An empty filename will open stdout instead.
+  Output(const std::string &filename, bool debug);
+  ~Output() = default;
+  template <typename T>
+  std::ostream &operator<<(const T &v) {
+    return out << v;
+  }
+
+ private:
+  Output() = delete;
+  Output(const Output &) = delete;
+  Output &operator=(const Output &) = delete;
+  std::ofstream outfile;
+  std::ostream out;
+};
+}
+
+#endif // wasm_support_file_h