parsing filename for filetype

floatimg.h

@@ -32,6 +32,10 @@ typedef struct {
 #define FIMG_TYPE_RGB			3
 #define FIMG_TYPE_RGBA			4
 
+#define FILE_TYPE_FIMG			1
+#define FILE_TYPE_PNM			2
+#define FILE_TYPE_PNG			3
+
 /*
  *	core module
  */
@@ -91,6 +95,8 @@ int   fimg_draw_something(FloatImg *fimg);
 
 int parse_WxH(char *str, int *pw, int *ph);
 int parse_double(char *str, double *dptr);
+int format_from_extension(char *fname);
+