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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_USER_PREFS_TRACKED_PREF_HASH_STORE_IMPL_H_
#define COMPONENTS_USER_PREFS_TRACKED_PREF_HASH_STORE_IMPL_H_
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "components/user_prefs/tracked/pref_hash_calculator.h"
#include "components/user_prefs/tracked/pref_hash_store.h"
class HashStoreContents;
class PrefHashStoreTransaction;
// Implements PrefHashStoreImpl by storing preference hashes in a
// HashStoreContents.
class PrefHashStoreImpl : public PrefHashStore {
public:
enum StoreVersion {
// No hashes have been stored in this PrefHashStore yet.
VERSION_UNINITIALIZED = 0,
// The hashes in this PrefHashStore were stored before the introduction
// of a version number and should be re-initialized.
VERSION_PRE_MIGRATION = 1,
// The hashes in this PrefHashStore were stored using the latest algorithm.
VERSION_LATEST = 2,
};
// Constructs a PrefHashStoreImpl that calculates hashes using
// |seed| and |device_id| and stores them in |contents|.
//
// The same |seed| and |device_id| must be used to load and validate
// previously stored hashes in |contents|.
PrefHashStoreImpl(const std::string& seed,
const std::string& device_id,
bool use_super_mac);
~PrefHashStoreImpl() override;
// Provides an external HashStoreContents implementation to be used.
// BeginTransaction() will ignore |storage| if this is provided.
void set_legacy_hash_store_contents(
scoped_ptr<HashStoreContents> legacy_hash_store_contents);
// Clears the contents of this PrefHashStore. |IsInitialized()| will return
// false after this call.
void Reset();
// PrefHashStore implementation.
scoped_ptr<PrefHashStoreTransaction> BeginTransaction(
scoped_ptr<HashStoreContents> storage) override;
private:
class PrefHashStoreTransactionImpl;
const PrefHashCalculator pref_hash_calculator_;
scoped_ptr<HashStoreContents> legacy_hash_store_contents_;
bool use_super_mac_;
DISALLOW_COPY_AND_ASSIGN(PrefHashStoreImpl);
};
#endif // COMPONENTS_USER_PREFS_TRACKED_PREF_HASH_STORE_IMPL_H_
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