-int isamd_alloc_block (ISAMH is, int cat);
-void isamd_release_block (ISAMH is, int cat, int pos);
-int isamd_read_block (ISAMH is, int cat, int pos, char *dst);
-int isamd_write_block (ISAMH is, int cat, int pos, char *src);
+
+
+int isamd_alloc_block (ISAMD is, int cat);
+void isamd_release_block (ISAMD is, int cat, int pos);
+int isamd_read_block (ISAMD is, int cat, int pos, char *dst);
+int isamd_write_block (ISAMD is, int cat, int pos, char *src);
+void isamd_free_diffs(ISAMD_PP pp);