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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-03-03 19:43:54 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-03-04 00:58:53 +0100
commit44c81eeffe9c8820b1009a7a5c728782aa5ebf40 (patch)
tree544eceb6dc5633018e5147c88ca9b07dd0fb54d9 /include/sqfs/predef.h
parent6f47796dc0761fac359ec59ce26c7af5154e538d (diff)
Add a generic copying mechanism to sqfs_object_t
This patch adds a deep-copy callback to sqfs_object_t and removes the copying mechanism from sqfs_compressor_t. This is also interesting for other types. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'include/sqfs/predef.h')
-rw-r--r--include/sqfs/predef.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/sqfs/predef.h b/include/sqfs/predef.h
index 6ca3503..0e81933 100644
--- a/include/sqfs/predef.h
+++ b/include/sqfs/predef.h
@@ -121,6 +121,8 @@ typedef struct sqfs_xattr_id_table_t sqfs_xattr_id_table_t;
*/
typedef struct sqfs_object_t {
void (*destroy)(struct sqfs_object_t *instance);
+
+ struct sqfs_object_t *(*copy)(const struct sqfs_object_t *orig);
} sqfs_object_t;
/**
@@ -135,4 +137,22 @@ static SQFS_INLINE void sqfs_destroy(void *obj)
((sqfs_object_t *)obj)->destroy(obj);
}
+/**
+ * @brief Create a deep copy of an object if possible.
+ *
+ * @memberof sqfs_object_t
+ *
+ * @param obj A pointer to an object
+ *
+ * @return A pointer to a new object, instantiated from the old on success,
+ * NULL on failure.
+ */
+static SQFS_INLINE void *sqfs_copy(const void *obj)
+{
+ if (((sqfs_object_t *)obj)->copy != NULL)
+ return ((sqfs_object_t *)obj)->copy(obj);
+
+ return NULL;
+}
+
#endif /* SQFS_PREDEF_H */