tree 9f1163923dac3114158e769a925d22ac950db2d4
parent 69583ba50b96d51c7206e834ff165a871c7f2ffd
author Alex Deymo <deymo@google.com> 1478299793 -0700
committer chrome-bot <chrome-bot@chromium.org> 1504214394 -0700

Move extent copy and hash logic to a new file.

The SOURCE_COPY operation used to copy the source blocks one by one to
the target partition. This process is sub-optimal if there are several
consecutive blocks. This patch moves this copy and hash logic to a new
file and adds several unittests for it. The new logic copies in chunks
of up to 1MiB when the source and target data is contiguous.

BUG=b:34284069
TEST=Added unittests.

Change-Id: I9ed52b429a54a2b4d6edaba051284b7dcd8a9525
(cherry picked from commit a48f630400429ca010c5462967607985f2ffa7e4)
Reviewed-on: https://chromium-review.googlesource.com/641958
Commit-Ready: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
Reviewed-by: Sen Jiang <senj@chromium.org>