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+#ifndef SERIALIZER_H_51D08D41
+#define SERIALIZER_H_51D08D41
+
+#include <string>
+
+constexpr int SERIALIZER_VERSION = 0;
+
+class Serializer {
+ public:
+  enum CellType : char {
+    Null = 0,
+    Line = 1,
+    Square = 2,
+    Star = 3,
+    Nega = 4,
+    Triangle = 5,
+    Poly = 6,
+    Ylop = 7,
+    Nonce = 8
+  };
+
+  enum CellPart : char {
+    Start = 1,
+    EndLeft = 2,
+    EndRight = 4,
+    EndTop = 8,
+    EndBottom = 16
+  };
+
+  enum GenericFlag : char {
+    Autosolved = 1,
+    Symmetrical = 2,
+    SymmetryX = 4,
+    SymmetryY = 8,
+    Pillar = 16
+  };
+
+  enum LineColor : char {
+    LineNone = 0,
+    LineBlack = 1,
+    LineBlue = 2,
+    LineYellow = 3
+  };
+
+  enum DotColor : char {
+    DotNone = 0,
+    DotBlack = 1,
+    DotBlue = 2,
+    DotYellow = 3,
+    DotInvisible = 4
+  };
+
+  enum SettingsFlag : char {
+    NegationsCancelNegations = 1,
+    ShapelessZeroPoly = 2,
+    PrecisePolyominos = 4,
+    FlashForErrors = 8,
+    FatStartpoints = 16,
+    CustomMechanics = 32
+  };
+
+  enum GapType : char { GapNone = 0, GapBreak = 1, GapFull = 2 };
+
+  void writeByte(char val);
+  void writeInt(int val);
+  void writeLong(long val);
+  void writeColor(int val);
+  void writeString(const std::string& val);
+
+  std::string str() const;
+
+ private:
+  std::string buffer_;
+};
+
+#endif /* end of include guard: SERIALIZER_H_51D08D41 */