update_engine: Merge contiguous operations.
Merges operations of type SOURCE_COPY, REPLACE, or REPLACE_BZ if they
have the same type, are contiguous, have only one destination extent,
and their combined block count does not exceed the chunk size.
BUG=chromium:461651
TEST=`cros flash --src-image-to-delta`, checking generated payloads
using `cros payload show --list_ops`, unit tests.
CQ-DEPEND=CL:269134
Change-Id: I5f71e6828561f2e0a6a8ab3e3aae4c362ea2ddde
Reviewed-on: https://chromium-review.googlesource.com/269604
Reviewed-by: Alex Deymo <deymo@chromium.org>
Commit-Queue: Allie Wood <alliewood@chromium.org>
Trybot-Ready: Allie Wood <alliewood@chromium.org>
Tested-by: Allie Wood <alliewood@chromium.org>
diff --git a/utils.h b/utils.h
index f242c39..e374b5b 100644
--- a/utils.h
+++ b/utils.h
@@ -473,7 +473,7 @@
// extents are read from the file at |path|. |out_data_size| is the size of
// |out_data|. Returns false if the number of bytes to read given in
// |extents| does not equal |out_data_size|.
-bool ReadExtents(const std::string& path, std::vector<Extent>* extents,
+bool ReadExtents(const std::string& path, const std::vector<Extent>& extents,
chromeos::Blob* out_data, ssize_t out_data_size,
size_t block_size);