diff --git a/arch/aeslanier/decoder.cc b/arch/aeslanier/decoder.cc
index de22cd8c..16aceb79 100644
--- a/arch/aeslanier/decoder.cc
+++ b/arch/aeslanier/decoder.cc
@@ -4,6 +4,7 @@
 #include "lib/core/crc.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/sector.h"
 #include "lib/core/bytes.h"
 #include "fmt/format.h"
diff --git a/arch/agat/decoder.cc b/arch/agat/decoder.cc
index 2f99dba9..4cd81c75 100644
--- a/arch/agat/decoder.cc
+++ b/arch/agat/decoder.cc
@@ -4,6 +4,7 @@
 #include "lib/core/crc.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/sector.h"
 #include "lib/core/bytes.h"
 #include "fmt/format.h"
diff --git a/arch/amiga/decoder.cc b/arch/amiga/decoder.cc
index f745a331..8ff1c7d6 100644
--- a/arch/amiga/decoder.cc
+++ b/arch/amiga/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "protocol.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
diff --git a/arch/apple2/decoder.cc b/arch/apple2/decoder.cc
index 840c9b22..98804dd4 100644
--- a/arch/apple2/decoder.cc
+++ b/arch/apple2/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "protocol.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
diff --git a/arch/brother/decoder.cc b/arch/brother/decoder.cc
index af6096ab..3e41bf59 100644
--- a/arch/brother/decoder.cc
+++ b/arch/brother/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/decoders/decoders.h"
 #include "lib/encoders/encoders.h"
 #include "brother.h"
diff --git a/arch/c64/decoder.cc b/arch/c64/decoder.cc
index 66fe5a2c..ac34f29c 100644
--- a/arch/c64/decoder.cc
+++ b/arch/c64/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "protocol.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
diff --git a/arch/f85/decoder.cc b/arch/f85/decoder.cc
index f67b007f..1232cb5e 100644
--- a/arch/f85/decoder.cc
+++ b/arch/f85/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "protocol.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
diff --git a/arch/fb100/decoder.cc b/arch/fb100/decoder.cc
index ff2bec98..83e5c1b9 100644
--- a/arch/fb100/decoder.cc
+++ b/arch/fb100/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "protocol.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
diff --git a/arch/ibm/decoder.cc b/arch/ibm/decoder.cc
index 22ca1af9..cb24f897 100644
--- a/arch/ibm/decoder.cc
+++ b/arch/ibm/decoder.cc
@@ -4,6 +4,7 @@
 #include "lib/core/crc.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/sector.h"
 #include "arch/ibm/ibm.pb.h"
 #include "lib/proto.h"
diff --git a/arch/macintosh/decoder.cc b/arch/macintosh/decoder.cc
index d5514284..9e6bee61 100644
--- a/arch/macintosh/decoder.cc
+++ b/arch/macintosh/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "protocol.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
diff --git a/arch/micropolis/decoder.cc b/arch/micropolis/decoder.cc
index dc819c0e..63ae43cb 100644
--- a/arch/micropolis/decoder.cc
+++ b/arch/micropolis/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
 #include "micropolis.h"
diff --git a/arch/mx/decoder.cc b/arch/mx/decoder.cc
index eeb6b90d..a7758a18 100644
--- a/arch/mx/decoder.cc
+++ b/arch/mx/decoder.cc
@@ -4,6 +4,7 @@
 #include "lib/core/crc.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/sector.h"
 #include <string.h>
 
diff --git a/arch/northstar/decoder.cc b/arch/northstar/decoder.cc
index 1d48a82d..4c5420d8 100644
--- a/arch/northstar/decoder.cc
+++ b/arch/northstar/decoder.cc
@@ -14,6 +14,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
 #include "northstar.h"
diff --git a/arch/rolandd20/decoder.cc b/arch/rolandd20/decoder.cc
index 11675ff9..629d9b24 100644
--- a/arch/rolandd20/decoder.cc
+++ b/arch/rolandd20/decoder.cc
@@ -3,6 +3,7 @@
 #include "lib/core/crc.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/sector.h"
 #include "lib/core/bytes.h"
 #include "rolandd20.h"
diff --git a/arch/smaky6/decoder.cc b/arch/smaky6/decoder.cc
index 21ce96de..d2496c39 100644
--- a/arch/smaky6/decoder.cc
+++ b/arch/smaky6/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "protocol.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
diff --git a/arch/tartu/decoder.cc b/arch/tartu/decoder.cc
index 16aa946e..8da1507e 100644
--- a/arch/tartu/decoder.cc
+++ b/arch/tartu/decoder.cc
@@ -5,16 +5,20 @@
 #include "lib/core/crc.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/sector.h"
 #include <string.h>
 
 constexpr uint64_t HEADER_BITS = 0xaaaaaaaa44895554LL;
-constexpr uint64_t DATA_BITS = 0xaaaaaaaa44895545LL;
+constexpr uint64_t DATA_BITS =   0xaaaaaaaa44895545LL;
 
 static const FluxPattern HEADER_PATTERN(64, HEADER_BITS);
 static const FluxPattern DATA_PATTERN(64, DATA_BITS);
 
-const FluxMatchers ANY_RECORD_PATTERN{&HEADER_PATTERN, &DATA_PATTERN};
+const FluxMatchers ANY_RECORD_PATTERN {
+    &HEADER_PATTERN,
+    &DATA_PATTERN
+};
 
 class TartuDecoder : public Decoder
 {
@@ -25,7 +29,9 @@ public:
     {
     }
 
-    void beginTrack() override {}
+    void beginTrack() override
+    {
+    }
 
     nanoseconds_t advanceToNextRecord() override
     {
@@ -39,7 +45,7 @@ public:
 
         auto bits = readRawBits(16 * 4);
         auto bytes = decodeFmMfm(bits).slice(0, 4);
-
+        
         ByteReader br(bytes);
         uint8_t track = br.read_8();
         _sector->logicalTrack = track >> 1;
@@ -48,7 +54,7 @@ public:
         _sector->logicalSector = br.read_8();
         uint8_t wantChecksum = br.read_8();
         uint8_t gotChecksum = ~sumBytes(bytes.slice(0, 3));
-
+        
         if (wantChecksum == gotChecksum)
             _sector->status = Sector::DATA_MISSING;
 
@@ -59,15 +65,14 @@ public:
     {
         if (readRaw64() != DATA_BITS)
             return;
-
+    
         const auto& bits = readRawBits(129 * 16);
         const auto& bytes = decodeFmMfm(bits).slice(0, 129);
         _sector->data = bytes.slice(0, 128);
 
         uint8_t wantChecksum = bytes.reader().seek(128).read_8();
         uint8_t gotChecksum = ~sumBytes(_sector->data);
-        _sector->status =
-            (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
+        _sector->status = (wantChecksum == gotChecksum) ? Sector::OK : Sector::BAD_CHECKSUM;
     }
 
 private:
@@ -78,3 +83,4 @@ std::unique_ptr<Decoder> createTartuDecoder(const DecoderProto& config)
 {
     return std::unique_ptr<Decoder>(new TartuDecoder(config));
 }
+
diff --git a/arch/tids990/decoder.cc b/arch/tids990/decoder.cc
index bf3718a2..00951405 100644
--- a/arch/tids990/decoder.cc
+++ b/arch/tids990/decoder.cc
@@ -5,6 +5,7 @@
 #include "lib/core/crc.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/sector.h"
 #include <string.h>
 #include <fmt/format.h>
diff --git a/arch/victor9k/decoder.cc b/arch/victor9k/decoder.cc
index 6468548a..e8fecf64 100644
--- a/arch/victor9k/decoder.cc
+++ b/arch/victor9k/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "protocol.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
diff --git a/arch/zilogmcz/decoder.cc b/arch/zilogmcz/decoder.cc
index 0ea39a7e..1e315cd4 100644
--- a/arch/zilogmcz/decoder.cc
+++ b/arch/zilogmcz/decoder.cc
@@ -1,6 +1,7 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include "protocol.h"
 #include "lib/decoders/decoders.h"
 #include "lib/sector.h"
diff --git a/build.py b/build.py
index 1d894c96..46b78493 100644
--- a/build.py
+++ b/build.py
@@ -29,6 +29,7 @@ cxxlibrary(
         "./lib/decoders/decoders.cc",
         "./lib/decoders/fluxdecoder.cc",
         "./lib/decoders/fluxmapreader.cc",
+        "./lib/decoders/fluxpattern.cc",
         "./lib/decoders/fmmfm.cc",
         "./lib/encoders/encoders.cc",
         "./lib/fl2.cc",
@@ -159,6 +160,7 @@ cxxlibrary(
         "lib/decoders/decoders.h": "./lib/decoders/decoders.h",
         "lib/decoders/fluxdecoder.h": "./lib/decoders/fluxdecoder.h",
         "lib/decoders/fluxmapreader.h": "./lib/decoders/fluxmapreader.h",
+        "lib/decoders/fluxpattern.h": "./lib/decoders/fluxpattern.h",
         "lib/decoders/rawbits.h": "./lib/decoders/rawbits.h",
         "lib/encoders/encoders.h": "./lib/encoders/encoders.h",
         "lib/scp.h": "./lib/scp.h",
diff --git a/lib/core/utils.cc b/lib/core/utils.cc
index 23452e9c..8ccefb8d 100644
--- a/lib/core/utils.cc
+++ b/lib/core/utils.cc
@@ -220,3 +220,17 @@ uint32_t unbcd(uint32_t bcd)
 
     return dec;
 }
+
+int findLowestSetBit(uint64_t value)
+{
+    if (!value)
+        return 0;
+    int bit = 1;
+    while (!(value & 1))
+    {
+        value >>= 1;
+        bit++;
+    }
+    return bit;
+}
+
diff --git a/lib/core/utils.h b/lib/core/utils.h
index 489da6a9..89e87a9a 100644
--- a/lib/core/utils.h
+++ b/lib/core/utils.h
@@ -21,6 +21,7 @@ extern std::string tohex(const std::string& s);
 extern bool doesFileExist(const std::string& filename);
 extern int countSetBits(uint32_t word);
 extern uint32_t unbcd(uint32_t bcd);
+extern int findLowestSetBit(uint64_t value);
 
 template <class K, class V>
 std::map<V, K> reverseMap(const std::map<K, V>& map)
diff --git a/lib/decoders/decoders.h b/lib/decoders/decoders.h
index 775e3550..819fc05b 100644
--- a/lib/decoders/decoders.h
+++ b/lib/decoders/decoders.h
@@ -8,6 +8,7 @@
 
 class Sector;
 class Fluxmap;
+class FluxMatcher;
 class FluxmapReader;
 class RawBits;
 class DecoderProto;
diff --git a/lib/decoders/fluxmapreader.cc b/lib/decoders/fluxmapreader.cc
index 459ec5ba..1ec1be79 100644
--- a/lib/decoders/fluxmapreader.cc
+++ b/lib/decoders/fluxmapreader.cc
@@ -2,7 +2,7 @@
 #include "lib/config.h"
 #include "lib/fluxmap.h"
 #include "lib/decoders/fluxmapreader.h"
-#include "lib/flags.h"
+#include "lib/decoders/fluxpattern.h"
 #include "lib/proto.h"
 #include "protocol.h"
 #include <numeric>
@@ -81,110 +81,6 @@ unsigned FluxmapReader::readInterval(nanoseconds_t clock)
     return ticks;
 }
 
-static int findLowestSetBit(uint64_t value)
-{
-    if (!value)
-        return 0;
-    int bit = 1;
-    while (!(value & 1))
-    {
-        value >>= 1;
-        bit++;
-    }
-    return bit;
-}
-
-FluxPattern::FluxPattern(unsigned bits, uint64_t pattern): _bits(bits)
-{
-    const uint64_t TOPBIT = 1ULL << 63;
-
-    assert(pattern != 0);
-
-    unsigned lowbit = findLowestSetBit(pattern) - 1;
-
-    pattern <<= 64 - bits;
-    _highzeroes = 0;
-    while (!(pattern & TOPBIT))
-    {
-        pattern <<= 1;
-        _highzeroes++;
-    }
-
-    _length = 0;
-    while (pattern != TOPBIT)
-    {
-        unsigned interval = 0;
-        do
-        {
-            pattern <<= 1;
-            interval++;
-        } while (!(pattern & TOPBIT));
-        _intervals.push_back(interval);
-        _length += interval;
-    }
-
-    if (lowbit)
-    {
-        _lowzero = true;
-        /* Note that length does *not* include this interval. */
-        _intervals.push_back(lowbit + 1);
-    }
-}
-
-bool FluxPattern::matches(const unsigned* end, FluxMatch& match) const
-{
-    const double clockDecodeThreshold =
-        globalConfig()->decoder().bit_error_threshold();
-    const unsigned* start = end - _intervals.size();
-    unsigned candidatelength = std::accumulate(start, end - _lowzero, 0);
-    if (!candidatelength)
-        return false;
-    match.clock = (double)candidatelength / (double)_length;
-
-    unsigned exactIntervals = _intervals.size() - _lowzero;
-    for (unsigned i = 0; i < exactIntervals; i++)
-    {
-        double ii = match.clock * (double)_intervals[i];
-        double ci = (double)start[i];
-        double error = fabs((ii - ci) / match.clock);
-        if (error > clockDecodeThreshold)
-            return false;
-    }
-
-    if (_lowzero)
-    {
-        double ii = match.clock * (double)_intervals[exactIntervals];
-        double ci = (double)start[exactIntervals];
-        double error = (ii - ci) / match.clock;
-        if (error > clockDecodeThreshold)
-            return false;
-    }
-
-    match.matcher = this;
-    match.intervals = _intervals.size();
-    match.zeroes = _highzeroes;
-    return true;
-}
-
-FluxMatchers::FluxMatchers(
-    const std::initializer_list<const FluxMatcher*> matchers):
-    _matchers(matchers)
-{
-    _intervals = 0;
-    for (const auto* matcher : matchers)
-        _intervals = std::max(_intervals, matcher->intervals());
-}
-
-bool FluxMatchers::matches(const unsigned* intervals, FluxMatch& match) const
-{
-    for (const auto* matcher : _matchers)
-    {
-        if (matcher->matches(intervals, match))
-            return true;
-    }
-    return false;
-}
-
 void FluxmapReader::seek(nanoseconds_t ns)
 {
     unsigned ticks = ns / NS_PER_TICK;
diff --git a/lib/decoders/fluxmapreader.h b/lib/decoders/fluxmapreader.h
index e154b8f0..1f14bd68 100644
--- a/lib/decoders/fluxmapreader.h
+++ b/lib/decoders/fluxmapreader.h
@@ -5,67 +5,8 @@
 #include "lib/flags.h"
 #include "protocol.h"
 
-class FluxMatcher;
 class DecoderProto;
-
-struct FluxMatch
-{
-    const FluxMatcher* matcher;
-    unsigned intervals;
-    double clock;
-    unsigned zeroes;
-};
-
-class FluxMatcher
-{
-public:
-    virtual ~FluxMatcher() {}
-
-    /* Returns the number of intervals matched */
-    virtual bool matches(const unsigned* intervals, FluxMatch& match) const = 0;
-    virtual unsigned intervals() const = 0;
-};
-
-class FluxPattern : public FluxMatcher
-{
-public:
-    FluxPattern(unsigned bits, uint64_t patterns);
-
-    bool matches(const unsigned* intervals, FluxMatch& match) const override;
-
-    unsigned intervals() const override
-    {
-        return _intervals.size();
-    }
-
-private:
-    std::vector<unsigned> _intervals;
-    unsigned _length;
-    unsigned _bits;
-    unsigned _highzeroes;
-    bool _lowzero = false;
-
-public:
-    friend void test_patternconstruction();
-    friend void test_patternmatching();
-};
-
-class FluxMatchers : public FluxMatcher
-{
-public:
-    FluxMatchers(const std::initializer_list<const FluxMatcher*> matchers);
-
-    bool matches(const unsigned* intervals, FluxMatch& match) const override;
-
-    unsigned intervals() const override
-    {
-        return _intervals;
-    }
-
-private:
-    unsigned _intervals;
-    std::vector<const FluxMatcher*> _matchers;
-};
+class FluxMatcher;
 
 class FluxmapReader
 {
diff --git a/lib/decoders/fluxpattern.cc b/lib/decoders/fluxpattern.cc
new file mode 100644
index 00000000..4836b54c
--- /dev/null
+++ b/lib/decoders/fluxpattern.cc
@@ -0,0 +1,100 @@
+#include "lib/core/globals.h"
+#include "lib/config.h"
+#include "lib/fluxmap.h"
+#include "lib/decoders/fluxpattern.h"
+#include "lib/proto.h"
+#include "protocol.h"
+#include <numeric>
+#include <math.h>
+#include <strings.h>
+
+FluxPattern::FluxPattern(unsigned bits, uint64_t pattern): _bits(bits)
+{
+    const uint64_t TOPBIT = 1ULL << 63;
+
+    assert(pattern != 0);
+
+    unsigned lowbit = findLowestSetBit(pattern) - 1;
+
+    pattern <<= 64 - bits;
+    _highzeroes = 0;
+    while (!(pattern & TOPBIT))
+    {
+        pattern <<= 1;
+        _highzeroes++;
+    }
+
+    _length = 0;
+    while (pattern != TOPBIT)
+    {
+        unsigned interval = 0;
+        do
+        {
+            pattern <<= 1;
+            interval++;
+        } while (!(pattern & TOPBIT));
+        _intervals.push_back(interval);
+        _length += interval;
+    }
+
+    if (lowbit)
+    {
+        _lowzero = true;
+        /* Note that length does *not* include this interval. */
+        _intervals.push_back(lowbit + 1);
+    }
+}
+
+bool FluxPattern::matches(const unsigned* end, FluxMatch& match) const
+{
+    const double clockDecodeThreshold =
+        globalConfig()->decoder().bit_error_threshold();
+    const unsigned* start = end - _intervals.size();
+    unsigned candidatelength = std::accumulate(start, end - _lowzero, 0);
+    if (!candidatelength)
+        return false;
+    match.clock = (double)candidatelength / (double)_length;
+
+    unsigned exactIntervals = _intervals.size() - _lowzero;
+    for (unsigned i = 0; i < exactIntervals; i++)
+    {
+        double ii = match.clock * (double)_intervals[i];
+        double ci = (double)start[i];
+        double error = fabs((ii - ci) / match.clock);
+        if (error > clockDecodeThreshold)
+            return false;
+    }
+
+    if (_lowzero)
+    {
+        double ii = match.clock * (double)_intervals[exactIntervals];
+        double ci = (double)start[exactIntervals];
+        double error = (ii - ci) / match.clock;
+        if (error > clockDecodeThreshold)
+            return false;
+    }
+
+    match.matcher = this;
+    match.intervals = _intervals.size();
+    match.zeroes = _highzeroes;
+    return true;
+}
+
+FluxMatchers::FluxMatchers(
+    const std::initializer_list<const FluxMatcher*> matchers):
+    _matchers(matchers)
+{
+    _intervals = 0;
+    for (const auto* matcher : matchers)
+        _intervals = std::max(_intervals, matcher->intervals());
+}
+
+bool FluxMatchers::matches(const unsigned* intervals, FluxMatch& match) const
+{
+    for (const auto* matcher : _matchers)
+    {
+        if (matcher->matches(intervals, match))
+            return true;
+    }
+    return false;
+}
diff --git a/lib/decoders/fluxpattern.h b/lib/decoders/fluxpattern.h
new file mode 100644
index 00000000..262dfd99
--- /dev/null
+++ b/lib/decoders/fluxpattern.h
@@ -0,0 +1,68 @@
+#pragma once
+
+#include "lib/core/utils.h"
+#include "lib/fluxmap.h"
+#include "lib/flags.h"
+#include "protocol.h"
+
+class FluxMatcher;
+class DecoderProto;
+
+struct FluxMatch
+{
+    const FluxMatcher* matcher;
+    unsigned intervals;
+    double clock;
+    unsigned zeroes;
+};
+
+class FluxMatcher
+{
+public:
+    virtual ~FluxMatcher() {}
+
+    /* Returns the number of intervals matched */
+    virtual bool matches(const unsigned* intervals, FluxMatch& match) const = 0;
+    virtual unsigned intervals() const = 0;
+};
+
+class FluxPattern : public FluxMatcher
+{
+public:
+    FluxPattern(unsigned bits, uint64_t patterns);
+
+    bool matches(const unsigned* intervals, FluxMatch& match) const override;
+
+    unsigned intervals() const override
+    {
+        return _intervals.size();
+    }
+
+private:
+    std::vector<unsigned> _intervals;
+    unsigned _length;
+    unsigned _bits;
+    unsigned _highzeroes;
+    bool _lowzero = false;
+
+public:
+    friend void test_patternconstruction();
+    friend void test_patternmatching();
+};
+
+class FluxMatchers : public FluxMatcher
+{
+public:
+    FluxMatchers(const std::initializer_list<const FluxMatcher*> matchers);
+
+    bool matches(const unsigned* intervals, FluxMatch& match) const override;
+
+    unsigned intervals() const override
+    {
+        return _intervals;
+    }
+
+private:
+    unsigned _intervals;
+    std::vector<const FluxMatcher*> _matchers;
+};
diff --git a/tests/fluxpattern.cc b/tests/fluxpattern.cc
index 571ad484..be82120e 100644
--- a/tests/fluxpattern.cc
+++ b/tests/fluxpattern.cc
@@ -1,6 +1,6 @@
 #include "lib/core/globals.h"
 #include "lib/fluxmap.h"
-#include "lib/decoders/fluxmapreader.h"
+#include "lib/decoders/fluxpattern.h"
 #include <sstream>
 
 typedef std::vector<unsigned> ivector;