[ltt-dev] [BABELTRACE PATCH] Basic seek support

[Julien Desfossez]

For now just mimic the previous behaviour of babeltrace but with a basic
seek structure.

Signed-off-by: Julien Desfossez <julien.desfossez at polymtl.ca>
---
 converter/babeltrace-lib.c |   33 +++++++++++++++++++++++++--------
 1 files changed, 25 insertions(+), 8 deletions(-)

diff --git a/converter/babeltrace-lib.c b/converter/babeltrace-lib.c
index d078a69..c8f71c0 100644
--- a/converter/babeltrace-lib.c
+++ b/converter/babeltrace-lib.c
@@ -156,7 +156,6 @@ int stream_compare(void *a, void *b)
 		return 0;
 }
 
-/* TODO: use begin_pos/end_pos */
 struct babeltrace_iter *babeltrace_iter_create(struct trace_collection *tc,
 		struct trace_collection_pos *begin_pos,
 		struct trace_collection_pos *end_pos)
@@ -170,6 +169,7 @@ struct babeltrace_iter *babeltrace_iter_create(struct trace_collection *tc,
 		goto error_malloc;
 	iter->stream_heap = g_new(struct ptr_heap, 1);
 	iter->tc = tc;
+	iter->end_pos = end_pos;
 
 	ret = heap_init(iter->stream_heap, 0, stream_compare);
 	if (ret < 0)
@@ -198,12 +198,27 @@ struct babeltrace_iter *babeltrace_iter_create(struct trace_collection *tc,
 				file_stream = g_ptr_array_index(stream->streams,
 						filenr);
 
-				ret = stream_read_event(file_stream);
-				if (ret == EOF) {
-					ret = 0;
-					continue;
-				} else if (ret) {
-					goto error;
+				if (begin_pos) {
+					switch (begin_pos->type) {
+					case BT_SEEK_CUR:
+						/* just insert into the heap we should already know the timestamps */
+						break;
+					case BT_SEEK_BEGIN:
+						ctf_move_pos_slow(&file_stream->pos, 0, SEEK_SET);
+						ret = stream_read_event(file_stream);
+						if (ret == EOF) {
+							ret = 0;
+							continue;
+						} else if (ret) {
+							goto error;
+						}
+						break;
+					case BT_SEEK_TIME:
+					case BT_SEEK_RESTORE:
+					case BT_SEEK_END:
+					default:
+						assert(0); /* Not yet defined */
+					}
 				}
 				/* Add to heap */
 				ret = heap_insert(iter->stream_heap, file_stream);
@@ -286,12 +301,14 @@ int convert_trace(struct trace_descriptor *td_write,
 	struct ctf_stream *stream;
 	struct ctf_stream_event *event;
 	struct ctf_text_stream_pos *sout;
+	struct trace_collection_pos begin_pos;
 	int ret = 0;
 
 	sout = container_of(td_write, struct ctf_text_stream_pos,
 			trace_descriptor);
 
-	iter = babeltrace_iter_create(trace_collection_read, NULL, NULL);
+	begin_pos.type = BT_SEEK_BEGIN;
+	iter = babeltrace_iter_create(trace_collection_read, &begin_pos, NULL);
 	while (babeltrace_iter_read_event(iter, &stream, &event) == 0) {
 		ret = sout->parent.event_cb(&sout->parent, stream);
 		if (ret) {
-- 
1.7.4.1