AU: When applying delta locally, get source checksums

omaha_hash_calculator.h

 // 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.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_HASH_CALCULATOR_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_HASH_CALCULATOR_H__
 
 #include <string>
 #include <vector>
 
@@ skipping 52 matching lines @@
   static bool RawHashOfData(const std::vector<char>& data,
                             std::vector<char>* out_hash);
   static off_t RawHashOfFile(const std::string& name, off_t length,
                              std::vector<char>* out_hash);
 
   // Used by tests
   static std::string OmahaHashOfBytes(const void* data, size_t length);
   static std::string OmahaHashOfString(const std::string& str);
   static std::string OmahaHashOfData(const std::vector<char>& data);
 
+  static bool Base64Encode(const void* data, size_t size, std::string* out);
+
  private:
   // If non-empty, the final base64 encoded hash and the raw hash. Will only be
   // set to non-empty when Finalize is called.
   std::string hash_;
   std::vector<char> raw_hash_;
 
   // Init success
   bool valid_;
 
   // The hash state used by OpenSSL
   SHA256_CTX ctx_;
   DISALLOW_COPY_AND_ASSIGN(OmahaHashCalculator);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_OMAHA_HASH_CALCULATOR_H__