-extern void buffer_compact(buffer_t *buffer, int maxsize);
-extern char *buffer_prepare(buffer_t *buffer, int size);
-extern void buffer_add(buffer_t *buffer, const char *data, int size);
+extern void buffer_compact(buffer_t *buffer, uint32_t maxsize);
+extern char *buffer_prepare(buffer_t *buffer, uint32_t size);
+extern void buffer_add(buffer_t *buffer, const char *data, uint32_t size);