More reorganization to reuse JSON parsing

read_json.hpp

@@ -0,0 +1,13 @@
+#define GEOM_POINT 0	   /* array of positions */
+#define GEOM_MULTIPOINT 1      /* array of arrays of positions */
+#define GEOM_LINESTRING 2      /* array of arrays of positions */
+#define GEOM_MULTILINESTRING 3 /* array of arrays of arrays of positions */
+#define GEOM_POLYGON 4	 /* array of arrays of arrays of positions */
+#define GEOM_MULTIPOLYGON 5    /* array of arrays of arrays of arrays of positions */
+#define GEOM_TYPES 6
+
+extern const char *geometry_names[GEOM_TYPES];
+extern int geometry_within[GEOM_TYPES];
+extern int mb_geometry[GEOM_TYPES];
+
+void json_context(json_object *j);