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diff --git a/tools/aapt2/io/FileInputStream.h b/tools/aapt2/io/FileInputStream.h
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+++ b/tools/aapt2/io/FileInputStream.h
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+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef AAPT_IO_FILEINPUTSTREAM_H
+#define AAPT_IO_FILEINPUTSTREAM_H
+
+#include "io/Io.h"
+
+#include <memory>
+#include <string>
+
+#include "android-base/macros.h"
+#include "android-base/unique_fd.h"
+
+namespace aapt {
+namespace io {
+
+class FileInputStream : public InputStream {
+ public:
+  explicit FileInputStream(const std::string& path, size_t buffer_capacity = 4096);
+
+  // Takes ownership of `fd`.
+  explicit FileInputStream(int fd, size_t buffer_capacity = 4096);
+
+  bool Next(const void** data, size_t* size) override;
+
+  void BackUp(size_t count) override;
+
+  size_t ByteCount() const override;
+
+  bool HadError() const override;
+
+  std::string GetError() const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FileInputStream);
+
+  android::base::unique_fd fd_;
+  std::string error_;
+  std::unique_ptr<uint8_t[]> buffer_;
+  size_t buffer_capacity_;
+  size_t buffer_offset_;
+  size_t buffer_size_;
+  size_t total_byte_count_;
+};
+
+}  // namespace io
+}  // namespace aapt
+
+#endif  // AAPT_IO_FILEINPUTSTREAM_H