Huffman encoded labels

+ more or less related fixes/refactoring

src/common/garmin.h

@@ -15,4 +15,15 @@ inline double toWGS24(qint32 v)
 	return toWGS32(LS(v, 8));
 }
 
+inline quint8 vs(const quint8 b0)
+{
+	static const quint8 sizes[] = {4, 1, 2, 1, 3, 1, 2, 1};
+	return sizes[b0 & 0x07];
+}
+
+inline quint8 bs(const quint8 val)
+{
+	return (val + 7) >> 3;
+}
+
 #endif // GARMIN_H