//
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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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// 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 (const auto& extent : extents) {
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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());
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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,
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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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