update_engine: Remove sparse hole extents.
Whenever there is an extent beginning with a sparse hole, that extent
will be filtered out. Extents are now read in from the partition rather
than the file itself in ReadFileToDiff. src/dst_length are set to the
number of blocks in src/dst_extents * block_size.
This was tested manually with _GenerateSinglePayload to generate a delta
payload between test images.
BUG=chromium:469792,chromium:474497
TEST=`FEATURES=test emerge-link update_engine` and manual testing.
Change-Id: I384ec3f16f7fd9087159817358308f22d29e9edf
Reviewed-on: https://chromium-review.googlesource.com/264442
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Trybot-Ready: Alex Deymo <deymo@chromium.org>
Commit-Queue: Allie Wood <alliewood@chromium.org>
Tested-by: Allie Wood <alliewood@chromium.org>
diff --git a/utils.h b/utils.h
index 2374a94..6d8b373 100644
--- a/utils.h
+++ b/utils.h
@@ -28,6 +28,7 @@
#include "update_engine/constants.h"
#include "update_engine/file_descriptor.h"
#include "update_engine/metrics.h"
+#include "update_engine/update_metadata.pb.h"
namespace chromeos_update_engine {
@@ -468,6 +469,14 @@
// value and setting it, and |false| otherwise.
bool GetMinorVersion(base::FilePath path, uint32_t* minor_version);
+// This function reads the specified data in |extents| into |out_data|. The
+// 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,
+ chromeos::Blob* out_data, ssize_t out_data_size,
+ size_t block_size);
+
} // namespace utils