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/compressor.h b/include/sqfs/compressor.h
index 5e0be5d..c0fafda 100644
--- a/include/sqfs/compressor.h
+++ b/include/sqfs/compressor.h
@@ -32,16 +32,13 @@
 /**
  * @interface sqfs_compressor_t
  *
+ * @extends sqfs_object_t
+ *
  * @brief Encapsultes a compressor with a simple interface to compress or
  *        extract chunks of data.
  */
 struct sqfs_compressor_t {
-	/**
-	 * @brief Destroy a compressor and free all memory used by it.
-	 *
-	 * @param cmp A pointer to a compressor object.
-	 */
-	void (*destroy)(sqfs_compressor_t *cmp);
+	sqfs_object_t base;
 
 	/**
 	 * @brief Write compressor options to disk if non-default settings