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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_ZUCCHINI_REFERENCE_SET_H_
#define COMPONENTS_ZUCCHINI_REFERENCE_SET_H_
#include <stddef.h>
#include <vector>
#include "base/memory/raw_ref.h"
#include "components/zucchini/image_utils.h"
namespace zucchini {
class TargetPool;
// Container of distinct references of one type, along with traits, only used
// during patch generation.
class ReferenceSet {
public:
using const_iterator = std::vector<Reference>::const_iterator;
// |traits| specifies the reference represented. |target_pool| specifies
// common targets shared by all reference represented, and mediates target
// translation between offsets and indexes.
ReferenceSet(const ReferenceTypeTraits& traits,
const TargetPool& target_pool);
ReferenceSet(const ReferenceSet&) = delete;
ReferenceSet(ReferenceSet&&);
~ReferenceSet();
// Either one of the initializers below should be called exactly once. These
// insert all references from |ref_reader/refs| into this class. The targets
// of these references must be in |target_pool_|.
void InitReferences(ReferenceReader&& ref_reader);
void InitReferences(const std::vector<Reference>& refs);
const std::vector<Reference>& references() const { return references_; }
const ReferenceTypeTraits& traits() const { return traits_; }
const TargetPool& target_pool() const { return *target_pool_; }
TypeTag type_tag() const { return traits_.type_tag; }
PoolTag pool_tag() const { return traits_.pool_tag; }
offset_t width() const { return traits_.width; }
// Looks up the Reference by an |offset| that it spans. |offset| is assumed to
// be valid, i.e., |offset| must be spanned by some Reference in
// |references_|.
Reference at(offset_t offset) const;
size_t size() const { return references_.size(); }
const_iterator begin() const { return references_.begin(); }
const_iterator end() const { return references_.end(); }
private:
ReferenceTypeTraits traits_;
const raw_ref<const TargetPool> target_pool_;
// List of distinct Reference instances sorted by location.
std::vector<Reference> references_;
};
} // namespace zucchini
#endif // COMPONENTS_ZUCCHINI_REFERENCE_SET_H_
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