#ifdef PB_ENABLE_MALLOC
static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t data_size, size_t array_size);
+static bool checkreturn pb_release_union_field(pb_istream_t *stream, pb_field_iter_t *iter);
static void pb_release_single_field(const pb_field_iter_t *iter);
#endif
static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter)
{
+#ifdef PB_ENABLE_MALLOC
+ /* When decoding an oneof field, check if there is old data that must be
+ * released first. */
+ if (PB_HTYPE(iter->pos->type) == PB_HTYPE_ONEOF)
+ {
+ if (!pb_release_union_field(stream, iter))
+ return false;
+ }
+#endif
+
switch (PB_ATYPE(iter->pos->type))
{
case PB_ATYPE_STATIC:
* itself also. */
*(bool*)iter->pSize = false;
}
- else if (PB_HTYPE(type) == PB_HTYPE_REPEATED)
+ else if (PB_HTYPE(type) == PB_HTYPE_REPEATED ||
+ PB_HTYPE(type) == PB_HTYPE_ONEOF)
{
- /* Set array count to 0, no need to initialize contents. */
+ /* REPEATED: Set array count to 0, no need to initialize contents.
+ ONEOF: Set which_field to 0. */
*(pb_size_t*)iter->pSize = 0;
init_data = false;
}
-
+
if (init_data)
{
if (PB_LTYPE(iter->pos->type) == PB_LTYPE_SUBMESSAGE)
*(void**)iter->pData = NULL;
/* Initialize array count to 0. */
- if (PB_HTYPE(type) == PB_HTYPE_REPEATED)
+ if (PB_HTYPE(type) == PB_HTYPE_REPEATED ||
+ PB_HTYPE(type) == PB_HTYPE_ONEOF)
{
*(pb_size_t*)iter->pSize = 0;
}
}
#ifdef PB_ENABLE_MALLOC
+/* Given an oneof field, if there has already been a field inside this oneof,
+ * release it before overwriting with a different one. */
+static bool pb_release_union_field(pb_istream_t *stream, pb_field_iter_t *iter)
+{
+ pb_size_t old_tag = *(pb_size_t*)iter->pSize; /* Previous which_ value */
+ pb_size_t new_tag = iter->pos->tag; /* New which_ value */
+
+ if (old_tag == 0)
+ return true; /* Ok, no old data in union */
+
+ if (old_tag == new_tag)
+ return true; /* Ok, old data is of same type => merge */
+
+ /* Release old data. The find can fail if the message struct contains
+ * invalid data. */
+ if (!pb_field_iter_find(iter, old_tag))
+ PB_RETURN_ERROR(stream, "invalid union tag");
+
+ pb_release_single_field(iter);
+
+ /* Restore iterator to where it should be.
+ * This shouldn't fail unless the pb_field_t structure is corrupted. */
+ if (!pb_field_iter_find(iter, new_tag))
+ PB_RETURN_ERROR(stream, "iterator error");
+
+ return true;
+}
+
static void pb_release_single_field(const pb_field_iter_t *iter)
{
pb_type_t type;
type = iter->pos->type;
+ if (PB_HTYPE(type) == PB_HTYPE_ONEOF)
+ {
+ if (*(pb_size_t*)iter->pSize != iter->pos->tag)
+ return; /* This is not the current field in the union */
+ }
+
/* Release anything contained inside an extension or submsg.
* This has to be done even if the submsg itself is statically
* allocated. */