//
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// Copyright (C) 2009 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_GRAPH_UTILS_H_
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#define UPDATE_ENGINE_PAYLOAD_GENERATOR_GRAPH_UTILS_H_
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#include <vector>
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#include <base/macros.h>
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#include "update_engine/payload_generator/graph_types.h"
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#include "update_engine/update_metadata.pb.h"
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// A few utility functions for graphs
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namespace chromeos_update_engine {
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namespace graph_utils {
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// Returns the number of blocks represented by all extents in the edge.
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uint64_t EdgeWeight(const Graph& graph, const Edge& edge);
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// These add a read-before dependency from graph[src] -> graph[dst]. If the dep
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// already exists, the block/s is/are added to the existing edge.
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void AddReadBeforeDep(Vertex* src, Vertex::Index dst, uint64_t block);
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void AddReadBeforeDepExtents(Vertex* src,
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Vertex::Index dst,
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const std::vector<Extent>& extents);
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void DropWriteBeforeDeps(Vertex::EdgeMap* edge_map);
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// For each node N in graph, drop all edges N->|index|.
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void DropIncomingEdgesTo(Graph* graph, Vertex::Index index);
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void DumpGraph(const Graph& graph);
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} // namespace graph_utils
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_GRAPH_UTILS_H_
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