Adding upstream version 2.13.6.upstream/2.13.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/lib/base/fifo.hpp b/lib/base/fifo.hpp
new file mode 100644
index 0000000..a8273c1
--- /dev/null
+++ b/lib/base/fifo.hpp
@@ -0,0 +1,48 @@
+/* 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 */