Add the FL2 reader.

lib/fluxsource/fl2fluxsource.cc

@@ -0,0 +1,55 @@
+#include "globals.h"
+#include "fluxmap.h"
+#include "lib/fluxsource/fluxsource.pb.h"
+#include "lib/fl2.pb.h"
+#include "fluxsource/fluxsource.h"
+#include "proto.h"
+#include "fmt/format.h"
+#include <fstream>
+
+class Fl2FluxSource : public FluxSource
+{
+public:
+    Fl2FluxSource(const Fl2FluxSourceProto& config):
+		_config(config)
+    {
+		std::ifstream ifs(_config.filename(), std::ios::in | std::ios::binary);
+		if (!ifs.is_open())
+			Error() << fmt::format("cannot open input file '{}': {}",
+				_config.filename(), strerror(errno));
+
+		if (!_proto.ParseFromIstream(&ifs))
+			Error() << "unable to read input file";
+	}
+
+public:
+    std::unique_ptr<Fluxmap> readFlux(int cylinder, int head)
+    {
+		for (const auto& track : _proto.track())
+		{
+			if ((track.cylinder() == cylinder) && (track.head() == head))
+				return std::make_unique<Fluxmap>(track.flux());
+		}
+
+		return std::unique_ptr<Fluxmap>();
+    }
+
+    void recalibrate() {}
+
+private:
+	void check_for_error(std::ifstream& ifs)
+	{
+		if (ifs.fail())
+			Error() << fmt::format("FL2 read I/O error: {}", strerror(errno));
+	}
+
+private:
+    const Fl2FluxSourceProto& _config;
+	FluxFileProto _proto;
+};
+
+std::unique_ptr<FluxSource> FluxSource::createFl2FluxSource(const Fl2FluxSourceProto& config)
+{
+    return std::unique_ptr<FluxSource>(new Fl2FluxSource(config));
+}
+