1 files changed, 105 insertions, 0 deletions
diff --git a/src/event/BufferedSocket.hxx b/src/event/BufferedSocket.hxx
new file mode 100644
index 000000000..cc763c164
--- /dev/null
+++ b/src/event/BufferedSocket.hxx
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_BUFFERED_SOCKET_HXX
+#define MPD_BUFFERED_SOCKET_HXX
+
+#include "check.h"
+#include "SocketMonitor.hxx"
+#include "gcc.h"
+
+struct fifo_buffer;
+class Error;
+
+/**
+ * A #SocketMonitor specialization that adds an input buffer.
+ */
+class BufferedSocket : protected SocketMonitor {
+	fifo_buffer *input;
+
+public:
+	BufferedSocket(int _fd, EventLoop &_loop)
+		:SocketMonitor(_fd, _loop), input(nullptr) {
+		ScheduleRead();
+	}
+
+	~BufferedSocket();
+
+	using SocketMonitor::IsDefined;
+	using SocketMonitor::Close;
+	using SocketMonitor::Write;
+
+private:
+	ssize_t DirectRead(void *data, size_t length);
+
+	/**
+	 * Receive data from the socket to the input buffer.
+	 *
+	 * @return false if the socket has been closed
+	 */
+	bool ReadToBuffer();
+
+protected:
+	/**
+	 * @return false if the socket has been closed
+	 */
+	bool ResumeInput();
+
+	/**
+	 * Mark a portion of the input buffer "consumed".  Only
+	 * allowed to be called from OnSocketInput().  This method
+	 * does not invalidate the pointer passed to OnSocketInput()
+	 * yet.
+	 */
+	void ConsumeInput(size_t nbytes);
+
+	enum class InputResult {
+		/**
+		 * The method was successful, and it is ready to
+		 * read more data.
+		 */
+		MORE,
+
+		/**
+		 * The method does not want to get more data for now.
+		 * It will call ResumeInput() when it's ready for
+		 * more.
+		 */
+		PAUSE,
+
+		/**
+		 * The method wants to be called again immediately, if
+		 * there's more data in the buffer.
+		 */
+		AGAIN,
+
+		/**
+		 * The method has closed the socket.
+		 */
+		CLOSED,
+	};
+
+	virtual InputResult OnSocketInput(const void *data, size_t length) = 0;
+	virtual void OnSocketError(Error &&error) = 0;
+	virtual void OnSocketClosed() = 0;
+
+	virtual bool OnSocketReady(unsigned flags) override;
+};
+
+#endif