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diff --git a/src/wasm-io.h b/src/wasm-io.h
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+/*
+ * Copyright 2017 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.
+ */
+
+//
+// Abstracts reading and writing, supporting both text and binary.
+//
+
+#ifndef wasm_wasm_io_h
+#define wasm_wasm_io_h
+
+#include "wasm.h"
+
+namespace wasm {
+
+class ModuleIO {
+protected:
+  bool debug = false;
+
+public:
+  void setDebug(bool debug_) { debug = debug_; }
+};
+
+class ModuleReader : public ModuleIO {
+public:
+  // read text
+  void readText(std::string filename, Module& wasm);
+  // read binary
+  void readBinary(std::string filename, Module& wasm);
+  // read text or binary, checking the contents for what it is
+  void read(std::string filename, Module& wasm);
+};
+
+class ModuleWriter : public ModuleIO {
+  bool binary = true;
+  bool debugInfo = false;
+  std::string symbolMap;
+
+public:
+  void setBinary(bool binary_) { binary = binary_; }
+  void setDebugInfo(bool debugInfo_) { debugInfo = debugInfo_; }
+  void setSymbolMap(std::string symbolMap_) { symbolMap = symbolMap_; }
+
+  // write text
+  void writeText(Module& wasm, std::string filename);
+  // write binary
+  void writeBinary(Module& wasm, std::string filename);
+  // write text or binary, defaulting to binary unless setBinary(false),
+  // and unless there is no output file (in which case we write text
+  // to stdout).
+  void write(Module& wasm, std::string filename);
+};
+
+}
+
+#endif // wasm_wasm_io_h