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101 lines
3.6 KiB
101 lines
3.6 KiB
//
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// Copyright (C) 2010 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_RANGES_H_
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#define UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_RANGES_H_
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#include <map>
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#include <set>
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#include <vector>
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#include <base/macros.h>
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#include "update_engine/update_metadata.pb.h"
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// An ExtentRanges object represents an unordered collection of extents (and
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// therefore blocks). Such an object may be modified by adding or subtracting
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// blocks (think: set addition or set subtraction). Note that ExtentRanges
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// ignores sparse hole extents mostly to avoid confusion between extending a
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// sparse hole range vs. set addition but also to ensure that the delta
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// generator doesn't use sparse holes as scratch space.
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namespace chromeos_update_engine {
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struct ExtentLess {
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bool operator()(const Extent& x, const Extent& y) const {
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return x.start_block() < y.start_block();
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}
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};
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Extent ExtentForRange(uint64_t start_block, uint64_t num_blocks);
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Extent ExtentForBytes(uint64_t block_size,
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uint64_t start_bytes,
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uint64_t size_bytes);
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class ExtentRanges {
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public:
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typedef std::set<Extent, ExtentLess> ExtentSet;
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ExtentRanges() : blocks_(0) {}
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void AddBlock(uint64_t block);
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void SubtractBlock(uint64_t block);
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void AddExtent(Extent extent);
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void SubtractExtent(const Extent& extent);
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void AddExtents(const std::vector<Extent>& extents);
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void SubtractExtents(const std::vector<Extent>& extents);
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void AddRepeatedExtents(
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const ::google::protobuf::RepeatedPtrField<Extent>& exts);
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void SubtractRepeatedExtents(
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const ::google::protobuf::RepeatedPtrField<Extent>& exts);
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void AddRanges(const ExtentRanges& ranges);
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void SubtractRanges(const ExtentRanges& ranges);
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// Returns true if the input extent overlaps with the current ExtentRanges.
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bool OverlapsWithExtent(const Extent& extent) const;
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// Returns whether the block |block| is in this ExtentRange.
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bool ContainsBlock(uint64_t block) const;
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static bool ExtentsOverlapOrTouch(const Extent& a, const Extent& b);
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static bool ExtentsOverlap(const Extent& a, const Extent& b);
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// Dumps contents to the log file. Useful for debugging.
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void Dump() const;
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uint64_t blocks() const { return blocks_; }
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const ExtentSet& extent_set() const { return extent_set_; }
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// Returns an ordered vector of extents for |count| blocks,
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// using extents in extent_set_. The returned extents are not
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// removed from extent_set_. |count| must be less than or equal to
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// the number of blocks in this extent set.
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std::vector<Extent> GetExtentsForBlockCount(uint64_t count) const;
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private:
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ExtentSet extent_set_;
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uint64_t blocks_;
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};
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// Filters out from the passed list of extents |extents| all the blocks in the
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// ExtentRanges set. Note that the order of the blocks in |extents| is preserved
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// omitting blocks present in the ExtentRanges |ranges|.
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std::vector<Extent> FilterExtentRanges(const std::vector<Extent>& extents,
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const ExtentRanges& ranges);
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} // namespace chromeos_update_engine
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#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_EXTENT_RANGES_H_
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