upload android base code part3

android/art/compiler/linker/output_stream.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2013 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 ART_COMPILER_LINKER_OUTPUT_STREAM_H_
+#define ART_COMPILER_LINKER_OUTPUT_STREAM_H_
+
+#include <ostream>
+#include <string>
+
+#include "base/macros.h"
+
+namespace art {
+
+enum Whence {
+  kSeekSet = SEEK_SET,
+  kSeekCurrent = SEEK_CUR,
+  kSeekEnd = SEEK_END,
+};
+std::ostream& operator<<(std::ostream& os, const Whence& rhs);
+
+class OutputStream {
+ public:
+  explicit OutputStream(const std::string& location) : location_(location) {}
+
+  virtual ~OutputStream() {}
+
+  const std::string& GetLocation() const {
+    return location_;
+  }
+
+  virtual bool WriteFully(const void* buffer, size_t byte_count) = 0;
+
+  virtual off_t Seek(off_t offset, Whence whence) = 0;
+
+  /*
+   * Flushes the stream. Returns whether the operation was successful.
+   *
+   * An OutputStream may delay reporting errors from WriteFully() or
+   * Seek(). In that case, Flush() shall report any pending error.
+   */
+  virtual bool Flush() = 0;
+
+ private:
+  const std::string location_;
+
+  DISALLOW_COPY_AND_ASSIGN(OutputStream);
+};
+
+}  // namespace art
+
+#endif  // ART_COMPILER_LINKER_OUTPUT_STREAM_H_