Add raw_socket_ostream.

This wraps NetworkStream in a llvm::raw_ostream.

include/support/raw_socket_ostream.h

@@ -0,0 +1,42 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2016. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#ifndef WPIUTIL_SUPPORT_RAW_SOCKET_OSTREAM_H_
+#define WPIUTIL_SUPPORT_RAW_SOCKET_OSTREAM_H_
+
+#include "llvm/raw_ostream.h"
+
+namespace wpi {
+
+class NetworkStream;
+
+class raw_socket_ostream : public llvm::raw_ostream {
+ public:
+  raw_socket_ostream(NetworkStream& stream, bool shouldClose)
+      : m_stream(stream), m_shouldClose(shouldClose) {}
+  ~raw_socket_ostream();
+
+  void close();
+
+  bool has_error() const { return m_error; }
+  void clear_error() { m_error = false; }
+
+ protected:
+  void error_detected() { m_error = true; }
+
+ private:
+  void write_impl(const char* data, std::size_t len) override;
+  uint64_t current_pos() const override;
+
+  NetworkStream& m_stream;
+  bool m_error = false;
+  bool m_shouldClose;
+};
+
+}  // namespace wpi
+
+#endif  // WPIUTIL_SUPPORT_RAW_SOCKET_OSTREAM_H_