tree 6022190804e956df1d35ca34eba812f87df0c693
parent 20c96723e97755d7480ba09d6d93f63166bf8481
author Sen Jiang <senj@google.com> 1517608281 -0800
committer Sen Jiang <senj@google.com> 1526084391 -0700

Split payload metadata logic from DeltaPerformer into its own class.

DeltaPerformer have code for both parsing payload and performing
operations. This change moves parsing payload header and validating
metadata signature to a new class PayloadMetadata so that
DeltaPerformer can focus on performing.

We will also have new code in another class that will use the new
PayloadMetadata class to parse payload metadata.

Bug: 65283633
Test: update_engine_unittests
Change-Id: Ie20b84713a0c66867a1de9d3d0cc29d0189b3c97
(cherry picked from commit 9c89e8499abeac3894718120d12b41301ffa3fc1)