+void pb_close_string_substream(pb_istream_t *stream, pb_istream_t *substream)
+{
+ stream->state = substream->state;
+
+#ifndef PB_NO_ERRMSG
+ stream->errmsg = substream->errmsg;
+#endif
+}
+
+/* Iterator for pb_field_t list */
+typedef struct {
+ const pb_field_t *start; /* Start of the pb_field_t array */
+ const pb_field_t *pos; /* Current position of the iterator */
+ unsigned field_index; /* Zero-based index of the field. */
+ unsigned required_field_index; /* Zero-based index that counts only the required fields */
+ void *dest_struct; /* Pointer to the destination structure to decode to */
+ void *pData; /* Pointer where to store current field value */
+ void *pSize; /* Pointer where to store the size of current array field */
+} pb_field_iterator_t;
+
+static void pb_field_init(pb_field_iterator_t *iter, const pb_field_t *fields, void *dest_struct)
+{
+ iter->start = iter->pos = fields;
+ iter->field_index = 0;
+ iter->required_field_index = 0;
+ iter->pData = (char*)dest_struct + iter->pos->data_offset;
+ iter->pSize = (char*)iter->pData + iter->pos->size_offset;
+ iter->dest_struct = dest_struct;
+}
+
+static bool pb_field_next(pb_field_iterator_t *iter)
+{
+ bool notwrapped = true;
+ size_t prev_size = iter->pos->data_size;
+
+ if (PB_ATYPE(iter->pos->type) == PB_ATYPE_STATIC &&
+ PB_HTYPE(iter->pos->type) == PB_HTYPE_REPEATED)
+ {
+ prev_size *= iter->pos->array_size;
+ }
+
+ if (iter->pos->tag == 0)
+ return false; /* Only happens with empty message types */
+
+ if (PB_HTYPE(iter->pos->type) == PB_HTYPE_REQUIRED)
+ iter->required_field_index++;
+
+ iter->pos++;
+ iter->field_index++;
+ if (iter->pos->tag == 0)
+ {
+ iter->pos = iter->start;
+ iter->field_index = 0;
+ iter->required_field_index = 0;
+ iter->pData = iter->dest_struct;
+ prev_size = 0;
+ notwrapped = false;
+ }
+
+ iter->pData = (char*)iter->pData + prev_size + iter->pos->data_offset;
+ iter->pSize = (char*)iter->pData + iter->pos->size_offset;
+ return notwrapped;
+}
+
+static bool checkreturn pb_field_find(pb_field_iterator_t *iter, uint32_t tag)
+{
+ unsigned start = iter->field_index;
+
+ do {
+ if (iter->pos->tag == tag &&
+ PB_LTYPE(iter->pos->type) != PB_LTYPE_EXTENSION)
+ {
+ return true;
+ }
+ pb_field_next(iter);
+ } while (iter->field_index != start);
+
+ return false;
+}
+
+/*************************
+ * Decode a single field *
+ *************************/
+
+static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter)