1 // 2 // Copyright (C) 2015 The Android Open Source Project 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_ 18 #define UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_ 19 20 #include <string> 21 #include <vector> 22 23 #include "update_engine/payload_consumer/payload_constants.h" 24 #include "update_engine/update_metadata.pb.h" 25 26 // Utility functions for manipulating Extents and lists of blocks. 27 28 namespace chromeos_update_engine { 29 30 // |block| must either be the next block in the last extent or a block 31 // in the next extent. This function will not handle inserting block 32 // into an arbitrary place in the extents. 33 void AppendBlockToExtents(std::vector<Extent>* extents, uint64_t block); 34 35 // Takes a collection (vector or RepeatedPtrField) of Extent and 36 // returns a vector of the blocks referenced, in order. 37 template<typename T> 38 std::vector<uint64_t> ExpandExtents(const T& extents) { 39 std::vector<uint64_t> ret; 40 for (const auto& extent : extents) { 41 if (extent.start_block() == kSparseHole) { 42 ret.resize(ret.size() + extent.num_blocks(), kSparseHole); 43 } else { 44 for (uint64_t block = extent.start_block(); 45 block < (extent.start_block() + extent.num_blocks()); block++) { 46 ret.push_back(block); 47 } 48 } 49 } 50 return ret; 51 } 52 53 // Stores all Extents in 'extents' into 'out'. 54 void StoreExtents(const std::vector<Extent>& extents, 55 google::protobuf::RepeatedPtrField<Extent>* out); 56 57 // Stores all extents in |extents| into |out_vector|. 58 void ExtentsToVector(const google::protobuf::RepeatedPtrField<Extent>& extents, 59 std::vector<Extent>* out_vector); 60 61 // Returns a string representing all extents in |extents|. 62 std::string ExtentsToString(const std::vector<Extent>& extents); 63 64 // Takes a pointer to extents |extents| and extents |extents_to_add|, and 65 // merges them by adding |extents_to_add| to |extents| and normalizing. 66 void ExtendExtents( 67 google::protobuf::RepeatedPtrField<Extent>* extents, 68 const google::protobuf::RepeatedPtrField<Extent>& extents_to_add); 69 70 // Takes a vector of extents and normalizes those extents. Expects the extents 71 // to be sorted by start block. E.g. if |extents| is [(1, 2), (3, 5), (10, 2)] 72 // then |extents| will be changed to [(1, 7), (10, 2)]. 73 void NormalizeExtents(std::vector<Extent>* extents); 74 75 // Return a subsequence of the list of blocks passed. Both the passed list of 76 // blocks |extents| and the return value are expressed as a list of Extent, not 77 // blocks. The returned list skips the first |block_offset| blocks from the 78 // |extents| and cotains |block_count| blocks (or less if |extents| is shorter). 79 std::vector<Extent> ExtentsSublist(const std::vector<Extent>& extents, 80 uint64_t block_offset, uint64_t block_count); 81 82 bool operator==(const Extent& a, const Extent& b); 83 84 } // namespace chromeos_update_engine 85 86 #endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_ 87
