Implement a more explicit object system

Make every dynamically allocated, opaque data structure inherit from
a common sqfs_object_t structure with common entry points (e.g. destroy).

This removes tons of public API functions and replaces them with a
simple sqfs_destroy instead. If semantics of the (until now implicit)
object system need to be extended, it can be much more conveniantely
done this way.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 3 insertions, 6 deletions

diff --git a/include/sqfs/io.h b/include/sqfs/io.h
index 1108a61..578c4fb 100644
--- a/include/sqfs/io.h
+++ b/include/sqfs/io.h
@@ -60,15 +60,12 @@ typedef enum {
 /**
  * @interface sqfs_file_t
  *
+ * @extends sqfs_object_t
+ *
  * @brief Abstracts file I/O to make it easy to embedd SquashFS.
  */
 struct sqfs_file_t {
-	/**
-	 * @brief Close the file and destroy the interface implementation.
-	 *
-	 * @param file A pointer to the file object.
-	 */
-	void (*destroy)(sqfs_file_t *file);
+	sqfs_object_t base;
 
 	/**
 	 * @brief Read a chunk of data from an absolute position.