-#define DECOMP_OK 0 /* no error occured */
-#define DECOMP_ERROR 1 /* error detected before decomp. */
-#define DECOMP_FATALERROR 2 /* error detected after decomp. */
+#define DECOMP_ERROR -1 /* error detected before decomp. */
+#define DECOMP_FATALERROR -2 /* error detected after decomp. */