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diff --git a/lib/base/fifo.hpp b/lib/base/fifo.hpp
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+/* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
+
+#ifndef FIFO_H
+#define FIFO_H
+
+#include "base/i2-base.hpp"
+#include "base/stream.hpp"
+
+namespace icinga
+{
+
+/**
+ * A byte-based FIFO buffer.
+ *
+ * @ingroup base
+ */
+class FIFO final : public Stream
+{
+public:
+ DECLARE_PTR_TYPEDEFS(FIFO);
+
+ static const size_t BlockSize = 512;
+
+ ~FIFO() override;
+
+ size_t Peek(void *buffer, size_t count, bool allow_partial = false) override;
+ size_t Read(void *buffer, size_t count, bool allow_partial = false) override;
+ void Write(const void *buffer, size_t count) override;
+ void Close() override;
+ bool IsEof() const override;
+ bool SupportsWaiting() const override;
+ bool IsDataAvailable() const override;
+
+ size_t GetAvailableBytes() const;
+
+private:
+ char *m_Buffer{nullptr};
+ size_t m_DataSize{0};
+ size_t m_AllocSize{0};
+ size_t m_Offset{0};
+
+ void ResizeBuffer(size_t newSize, bool decrease);
+ void Optimize();
+};
+
+}
+
+#endif /* FIFO_H */