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105 lines
4.1 KiB
105 lines
4.1 KiB
// |
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// Copyright (C) 2015 The Android Open Source Project |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// http://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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// |
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#ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_ |
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#define UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_ |
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#include <string> |
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#include <vector> |
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#include "update_engine/payload_consumer/payload_constants.h" |
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#include "update_engine/update_metadata.pb.h" |
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// Utility functions for manipulating Extents and lists of blocks. |
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namespace chromeos_update_engine { |
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// |block| must either be the next block in the last extent or a block |
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// in the next extent. This function will not handle inserting block |
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// into an arbitrary place in the extents. |
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void AppendBlockToExtents(std::vector<Extent>* extents, uint64_t block); |
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// Get/SetElement are intentionally overloaded so that templated functions |
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// can accept either type of collection of Extents. |
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Extent GetElement(const std::vector<Extent>& collection, size_t index); |
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Extent GetElement( |
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const google::protobuf::RepeatedPtrField<Extent>& collection, |
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size_t index); |
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// Return the total number of blocks in a collection (vector or |
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// RepeatedPtrField) of Extents. |
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template<typename T> |
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uint64_t BlocksInExtents(const T& collection) { |
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uint64_t ret = 0; |
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for (size_t i = 0; i < static_cast<size_t>(collection.size()); ++i) { |
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ret += GetElement(collection, i).num_blocks(); |
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} |
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return ret; |
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} |
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// Takes a collection (vector or RepeatedPtrField) of Extent and |
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// returns a vector of the blocks referenced, in order. |
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template<typename T> |
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std::vector<uint64_t> ExpandExtents(const T& extents) { |
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std::vector<uint64_t> ret; |
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for (size_t i = 0, e = static_cast<size_t>(extents.size()); i != e; ++i) { |
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const Extent extent = GetElement(extents, i); |
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if (extent.start_block() == kSparseHole) { |
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ret.resize(ret.size() + extent.num_blocks(), kSparseHole); |
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} else { |
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for (uint64_t block = extent.start_block(); |
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block < (extent.start_block() + extent.num_blocks()); block++) { |
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ret.push_back(block); |
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} |
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} |
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} |
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return ret; |
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} |
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// Stores all Extents in 'extents' into 'out'. |
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void StoreExtents(const std::vector<Extent>& extents, |
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google::protobuf::RepeatedPtrField<Extent>* out); |
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// Stores all extents in |extents| into |out_vector|. |
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void ExtentsToVector(const google::protobuf::RepeatedPtrField<Extent>& extents, |
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std::vector<Extent>* out_vector); |
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// Returns a string representing all extents in |extents|. |
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std::string ExtentsToString(const std::vector<Extent>& extents); |
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// Takes a pointer to extents |extents| and extents |extents_to_add|, and |
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// merges them by adding |extents_to_add| to |extents| and normalizing. |
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void ExtendExtents( |
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google::protobuf::RepeatedPtrField<Extent>* extents, |
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const google::protobuf::RepeatedPtrField<Extent>& extents_to_add); |
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// Takes a vector of extents and normalizes those extents. Expects the extents |
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// to be sorted by start block. E.g. if |extents| is [(1, 2), (3, 5), (10, 2)] |
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// then |extents| will be changed to [(1, 7), (10, 2)]. |
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void NormalizeExtents(std::vector<Extent>* extents); |
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// Return a subsequence of the list of blocks passed. Both the passed list of |
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// blocks |extents| and the return value are expressed as a list of Extent, not |
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// blocks. The returned list skips the first |block_offset| blocks from the |
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// |extents| and cotains |block_count| blocks (or less if |extents| is shorter). |
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std::vector<Extent> ExtentsSublist(const std::vector<Extent>& extents, |
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uint64_t block_offset, uint64_t block_count); |
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bool operator==(const Extent& a, const Extent& b); |
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} // namespace chromeos_update_engine |
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#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_UTILS_H_
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