-void fps_reverse(unsigned char *dest, unsigned char *from, int len);
-void fps_intersperse(unsigned char *dest, unsigned char *from, int len, char c);
-unsigned char fps_maximum(unsigned char *p, int len);
-unsigned char fps_minimum(unsigned char *p, int len);
-int fps_count(unsigned char *p, int len, unsigned char w);
+void fps_reverse(unsigned char *dest, unsigned char *from, unsigned long len);
+void fps_intersperse(unsigned char *dest, unsigned char *from, unsigned long len, unsigned char c);
+unsigned char fps_maximum(unsigned char *p, unsigned long len);
+unsigned char fps_minimum(unsigned char *p, unsigned long len);
+unsigned long fps_count(unsigned char *p, unsigned long len, unsigned char w);