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| 1 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_METADATA_H__ |
| 6 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_METADATA_H__ |
| 7 |
| 8 #include "update_engine/delta_diff_generator.h" |
| 9 #include "update_engine/graph_types.h" |
| 10 |
| 11 namespace chromeos_update_engine { |
| 12 |
| 13 class Metadata { |
| 14 public: |
| 15 // Reads metadata from old image and new image and determines |
| 16 // the smallest way to encode the metadata for the diff. |
| 17 // If there's no change in the metadata, it creates a MOVE |
| 18 // operation. If there is a change, the smallest of REPLACE, REPLACE_BZ, |
| 19 // or BSDIFF wins. It writes the diff to data_fd and updates data_file_size |
| 20 // accordingly. It also adds the required operation to the graph and adds the |
| 21 // metadata extents to blocks. |
| 22 // Returns true on success. |
| 23 static bool DeltaReadMetadata(Graph* graph, |
| 24 std::vector<DeltaDiffGenerator::Block>* blocks, |
| 25 const std::string& old_image, |
| 26 const std::string& new_image, |
| 27 int data_fd, |
| 28 off_t* data_file_size); |
| 29 |
| 30 private: |
| 31 // This should never be constructed. |
| 32 DISALLOW_IMPLICIT_CONSTRUCTORS(Metadata); |
| 33 }; |
| 34 |
| 35 }; // namespace chromeos_update_engine |
| 36 |
| 37 #endif // CHROMEOS_PLATFORM_UPDATE_ENGINE_METADATA_H__ |
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