Add buffering to ELF file generation

Bug: 10496017
Change-Id: I3cbad249e0fb33f726bd0a504b3b6bd9b4f759c8

1 files changed, 54 insertions, 0 deletions

diff --git a/compiler/buffered_output_stream.h b/compiler/buffered_output_stream.h
new file mode 100644
index 0000000000..7d874fbc5c
--- /dev/null
+++ b/compiler/buffered_output_stream.h
@@ -0,0 +1,54 @@
+/*
+ * 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_BUFFERED_OUTPUT_STREAM_H_
+#define ART_COMPILER_BUFFERED_OUTPUT_STREAM_H_
+
+#include "output_stream.h"
+
+#include "globals.h"
+
+namespace art {
+
+class BufferedOutputStream : public OutputStream {
+ public:
+  explicit BufferedOutputStream(OutputStream* out);
+
+  virtual ~BufferedOutputStream() {
+    delete out_;
+  }
+
+  virtual bool WriteFully(const void* buffer, int64_t byte_count);
+
+  virtual off_t Seek(off_t offset, Whence whence);
+
+ private:
+  static const size_t kBufferSize = 8 * KB;
+
+  bool Flush();
+
+  OutputStream* const out_;
+
+  uint8_t buffer_[kBufferSize];
+
+  size_t used_;
+
+  DISALLOW_COPY_AND_ASSIGN(BufferedOutputStream);
+};
+
+}  // namespace art
+
+#endif  // ART_COMPILER_BUFFERED_OUTPUT_STREAM_H_