sink.ctf.fs: write option field classes and fields

[babeltrace.git] / src / plugins / ctf / fs-sink / fs-sink-stream.c

diff --git a/src/plugins/ctf/fs-sink/fs-sink-stream.c b/src/plugins/ctf/fs-sink/fs-sink-stream.c
index 28f70e4f99d36a5c7a6b2b091afebc11d4fb4541..ed516b1cb32c8e4bb8707831062604a5b10b9b8e 100644 (file)
--- a/src/plugins/ctf/fs-sink/fs-sink-stream.c
+++ b/src/plugins/ctf/fs-sink/fs-sink-stream.c
@@ -335,6 +335,40 @@ end:
        return ret;
 }
 
+static inline
+int write_option_field(struct fs_sink_stream *stream,
+               struct fs_sink_ctf_field_class_option *fc,
+               const bt_field *field)
+{
+       int ret;
+       const bt_field *content_field =
+               bt_field_option_borrow_field_const(field);
+
+       ret = bt_ctfser_write_unsigned_int(&stream->ctfser,
+               content_field ? 1 : 0, 8, 8, BYTE_ORDER);
+       if (G_UNLIKELY(ret)) {
+               goto end;
+       }
+
+       /*
+        * CTF 1.8 has no option field class type, so this component
+        * translates the option field class to a variant field class
+        * where the options are:
+        *
+        * * An empty structure field class (field occupies 0 bits).
+        * * The optional field class itself.
+        *
+        * If `content_field` is `NULL`, do not write anything (empty
+        * structure).
+        */
+       if (content_field) {
+               ret = write_field(stream, fc->content_fc, content_field);
+       }
+
+end:
+       return ret;
+}
+
 static inline
 int write_variant_field(struct fs_sink_stream *stream,
                struct fs_sink_ctf_field_class_variant *fc,
@@ -389,6 +423,9 @@ int write_field(struct fs_sink_stream *stream,
        case FS_SINK_CTF_FIELD_CLASS_TYPE_SEQUENCE:
                ret = write_sequence_field(stream, (void *) fc, field);
                break;
+       case FS_SINK_CTF_FIELD_CLASS_TYPE_OPTION:
+               ret = write_option_field(stream, (void *) fc, field);
+               break;
        case FS_SINK_CTF_FIELD_CLASS_TYPE_VARIANT:
                ret = write_variant_field(stream, (void *) fc, field);
                break;