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diff --git a/pv/data/logicsegment.hpp b/pv/data/logicsegment.hpp
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+++ b/pv/data/logicsegment.hpp
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+/*
+ * This file is part of the PulseView project.
+ *
+ * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
+ *
+ * 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 St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#ifndef PULSEVIEW_PV_DATA_LOGICSNAPSHOT_H
+#define PULSEVIEW_PV_DATA_LOGICSNAPSHOT_H
+
+#include "segment.hpp"
+
+#include <utility>
+#include <vector>
+
+namespace sigrok {
+	class Logic;
+}
+
+namespace LogicSegmentTest {
+struct Pow2;
+struct Basic;
+struct LargeData;
+struct Pulses;
+struct LongPulses;
+}
+
+namespace pv {
+namespace data {
+
+class LogicSegment : public Segment
+{
+private:
+	struct MipMapLevel
+	{
+		uint64_t length;
+		uint64_t data_length;
+		void *data;
+	};
+
+private:
+	static const unsigned int ScaleStepCount = 10;
+	static const int MipMapScalePower;
+	static const int MipMapScaleFactor;
+	static const float LogMipMapScaleFactor;
+	static const uint64_t MipMapDataUnit;
+
+public:
+	typedef std::pair<int64_t, bool> EdgePair;
+
+public:
+	LogicSegment(std::shared_ptr<sigrok::Logic> logic,
+		uint64_t samplerate, uint64_t expected_num_samples = 0);
+
+	virtual ~LogicSegment();
+
+	void append_payload(std::shared_ptr<sigrok::Logic> logic);
+
+	void get_samples(uint8_t *const data,
+		int64_t start_sample, int64_t end_sample) const;
+
+private:
+	uint64_t unpack_sample(const uint8_t *ptr) const;
+	void pack_sample(uint8_t *ptr, uint64_t value);
+	
+	void reallocate_mipmap_level(MipMapLevel &m);
+
+	void append_payload_to_mipmap();
+
+	uint64_t get_sample(uint64_t index) const;
+
+public:
+	/**
+	 * Parses a logic data segment to generate a list of transitions
+	 * in a time interval to a given level of detail.
+	 * @param[out] edges The vector to place the edges into.
+	 * @param[in] start The start sample index.
+	 * @param[in] end The end sample index.
+	 * @param[in] min_length The minimum number of samples that
+	 * can be resolved at this level of detail.
+	 * @param[in] sig_index The index of the signal.
+	 **/
+	void get_subsampled_edges(std::vector<EdgePair> &edges,
+		uint64_t start, uint64_t end,
+		float min_length, int sig_index);
+
+private:
+	uint64_t get_subsample(int level, uint64_t offset) const;
+
+	static uint64_t pow2_ceil(uint64_t x, unsigned int power);
+
+private:
+	struct MipMapLevel mip_map_[ScaleStepCount];
+	uint64_t last_append_sample_;
+
+	friend struct LogicSegmentTest::Pow2;
+	friend struct LogicSegmentTest::Basic;
+	friend struct LogicSegmentTest::LargeData;
+	friend struct LogicSegmentTest::Pulses;
+	friend struct LogicSegmentTest::LongPulses;
+};
+
+} // namespace data
+} // namespace pv
+
+#endif // PULSEVIEW_PV_DATA_LOGICSNAPSHOT_H