extent_utils.h revision 5c6c65570013bbdbd67f9bf6391dd295ef5b5ee6
1// Copyright 2015 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 UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_ 6#define UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_ 7 8#include <vector> 9 10#include "update_engine/update_metadata.pb.h" 11 12// Utility functions for manipulating Extents and lists of blocks. 13 14namespace chromeos_update_engine { 15 16// |block| must either be the next block in the last extent or a block 17// in the next extent. This function will not handle inserting block 18// into an arbitrary place in the extents. 19void AppendBlockToExtents(std::vector<Extent>* extents, uint64_t block); 20 21// Get/SetElement are intentionally overloaded so that templated functions 22// can accept either type of collection of Extents. 23Extent GetElement(const std::vector<Extent>& collection, size_t index); 24Extent GetElement( 25 const google::protobuf::RepeatedPtrField<Extent>& collection, 26 size_t index); 27 28template<typename T> 29uint64_t BlocksInExtents(const T& collection) { 30 uint64_t ret = 0; 31 for (size_t i = 0; i < static_cast<size_t>(collection.size()); ++i) { 32 ret += GetElement(collection, i).num_blocks(); 33 } 34 return ret; 35} 36 37bool operator==(const Extent& a, const Extent& b); 38 39} // namespace chromeos_update_engine 40 41#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_ 42