mpack_tag_t mpack_read_tag(mpack_reader_t* reader) {
mpack_log("reading tag\n");
// make sure we can read a tag
if (mpack_reader_error(reader) != mpack_ok)
return mpack_tag_nil();
if (mpack_reader_track_element(reader) != mpack_ok)
return mpack_tag_nil();
mpack_tag_t tag;
mpack_memset(&tag, 0, sizeof(tag));
size_t count = mpack_parse_tag(reader, &tag);
if (count == 0)
return mpack_tag_nil();
#if MPACK_READ_TRACKING
mpack_error_t track_error = mpack_ok;
switch (tag.type) {
case mpack_type_map:
case mpack_type_array:
track_error = mpack_track_push(&reader->track, tag.type, tag.v.l);
break;
case mpack_type_str:
case mpack_type_bin:
case mpack_type_ext:
track_error = mpack_track_push(&reader->track, tag.type, tag.v.n);
break;
default:
break;
}
if (track_error != mpack_ok) {
mpack_reader_flag_error(reader, track_error);
return mpack_tag_nil();
}
#endif
// the tag is guaranteed to have been read out of
// the buffer, so we advance past it
reader->pos += count;
reader->left -= count;
return tag;
}
void mpack_writer_track_push(mpack_writer_t* writer, mpack_type_t type, uint64_t count) {
if (writer->error == mpack_ok)
mpack_writer_flag_if_error(writer, mpack_track_push(&writer->track, type, count));
}