1 files changed, 31 insertions, 0 deletions
diff --git a/src/lib/memarea.h b/src/lib/memarea.h
new file mode 100644
index 0000000..9c546df
--- /dev/null
+++ b/src/lib/memarea.h
@@ -0,0 +1,31 @@
+#ifndef MEMAREA_H
+#define MEMAREA_H
+
+typedef void memarea_free_callback_t(void *context);
+
+/* Create reference counted memory area. The callback is called when the
+   refcount drops to 0. */
+struct memarea *
+memarea_init(const void *data, size_t size,
+	     memarea_free_callback_t *callback, void *context);
+#define memarea_init(data, size, callback, context) \
+	memarea_init(data, size - \
+		CALLBACK_TYPECHECK(callback, void (*)(typeof(context))), \
+		(memarea_free_callback_t *)callback, context)
+/* Returns an empty memory area. */
+struct memarea *memarea_init_empty(void);
+
+void memarea_ref(struct memarea *area);
+void memarea_unref(struct memarea **area);
+/* Free the memory area without calling the callback.
+   This is allowed only when refcount==1. */
+void memarea_free_without_callback(struct memarea **area);
+
+unsigned int memarea_get_refcount(struct memarea *area);
+const void *memarea_get(struct memarea *area, size_t *size_r);
+size_t memarea_get_size(struct memarea *area);
+
+/* free-callback that does nothing */
+void memarea_free_callback_noop(void *context);
+
+#endif