AU: Start checkpointing update progress.

omaha_hash_calculator.cc

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "update_engine/omaha_hash_calculator.h"
 
 #include <openssl/bio.h>
 #include <openssl/buffer.h>
 #include <openssl/evp.h>
 #include "base/logging.h"
@@ skipping 79 matching lines @@
 }
 
 string OmahaHashCalculator::OmahaHashOfString(const string& str) {
   return OmahaHashOfBytes(str.data(), str.size());
 }
 
 string OmahaHashCalculator::OmahaHashOfData(const vector<char>& data) {
   return OmahaHashOfBytes(&data[0], data.size());
 }
 
+string OmahaHashCalculator::GetContext() const {
+  return string(reinterpret_cast<const char*>(&ctx_), sizeof(ctx_));
+}
+
+bool OmahaHashCalculator::SetContext(const std::string& context) {
+  TEST_AND_RETURN_FALSE(context.size() == sizeof(ctx_));
+  memcpy(&ctx_, context.data(), sizeof(ctx_));
+  return true;
+}
+
 }  // namespace chromeos_update_engine