Distinguish between signed and unsigned in the temporary file

geojson.c

@@ -179,6 +179,11 @@ void deserialize_int(char **f, int *n) {
 	*f += sizeof(int);
 }
 
+void deserialize_uint(char **f, unsigned *n) {
+	memcpy(n, *f, sizeof(unsigned));
+	*f += sizeof(unsigned);
+}
+
 void deserialize_byte(char **f, signed char *n) {
 	memcpy(n, *f, sizeof(signed char));
 	*f += sizeof(signed char);

geometry.cc

@@ -28,9 +28,9 @@ drawvec decode_geometry(char **meta, int z, unsigned tx, unsigned ty, int detail
 		}
 
 		if (d.op == VT_MOVETO || d.op == VT_LINETO) {
-			int wx, wy;
+			unsigned wx, wy;
-			deserialize_int(meta, &wx);
+			deserialize_uint(meta, &wx);
-			deserialize_int(meta, &wy);
+			deserialize_uint(meta, &wy);
 
 			long long wwx = (unsigned) wx;
 			long long wwy = (unsigned) wy;

tile.h

@@ -14,6 +14,7 @@
 struct pool;
 
 void deserialize_int(char **f, int *n);
+void deserialize_uint(char **f, unsigned *n);
 void deserialize_byte(char **f, signed char *n);
 struct pool_val *deserialize_string(char **f, struct pool *p, int type);