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, 2 insertions, 2 deletions

diff --git a/lib/common/comp_lzo.c b/lib/common/comp_lzo.c
index f371fb6..a0c838a 100644
--- a/lib/common/comp_lzo.c
+++ b/lib/common/comp_lzo.c
@@ -195,7 +195,7 @@ static sqfs_compressor_t *lzo_create_copy(sqfs_compressor_t *cmp)
 	return (sqfs_compressor_t *)lzo;
 }
 
-static void lzo_destroy(sqfs_compressor_t *base)
+static void lzo_destroy(sqfs_object_t *base)
 {
 	free(base);
 }
@@ -247,11 +247,11 @@ sqfs_compressor_t *lzo_compressor_create(const sqfs_compressor_config_t *cfg)
 	lzo->buf_size = scratch_size;
 	lzo->work_size = lzo_algs[cfg->opt.lzo.algorithm].bufsize;
 
-	base->destroy = lzo_destroy;
 	base->do_block = (cfg->flags & SQFS_COMP_FLAG_UNCOMPRESS) ?
 		lzo_uncomp_block : lzo_comp_block;
 	base->write_options = lzo_write_options;
 	base->read_options = lzo_read_options;
 	base->create_copy = lzo_create_copy;
+	((sqfs_object_t *)base)->destroy = lzo_destroy;
 	return base;
 }