cmake: Don't explicitly look for python2

[apps/agl-service-can-low-level.git] / pb_decode.c

diff --git a/pb_decode.c b/pb_decode.c
index 0677594..b21bfe3 100644 (file)
--- a/pb_decode.c
+++ b/pb_decode.c
@@ -48,6 +48,7 @@ static bool checkreturn pb_skip_string(pb_istream_t *stream);
 
 #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
 
@@ -395,6 +396,13 @@ static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t
 
         case PB_HTYPE_ONEOF:
             *(pb_size_t*)iter->pSize = iter->pos->tag;
+            if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE)
+            {
+                /* We memset to zero so that any callbacks are set to NULL.
+                 * Then set any default values. */
+                memset(iter->pData, 0, iter->pos->data_size);
+                pb_message_set_to_defaults((const pb_field_t*)iter->pos->ptr, iter->pData);
+            }
             return func(stream, iter->pos, iter->pData);
 
         default:
@@ -628,6 +636,16 @@ static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type
 
 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:
@@ -936,6 +954,34 @@ bool pb_decode_delimited(pb_istream_t *stream, const pb_field_t fields[], void *
 }
 
 #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;