chromium/components/safe_browsing/core/browser/db/hash_prefix_map.h

// Copyright 2022 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_SAFE_BROWSING_CORE_BROWSER_DB_HASH_PREFIX_MAP_H_
#define COMPONENTS_SAFE_BROWSING_CORE_BROWSER_DB_HASH_PREFIX_MAP_H_

#include <memory>
#include <string>
#include <string_view>
#include <unordered_map>

#include "base/files/memory_mapped_file.h"
#include "components/safe_browsing/core/browser/db/v4_protocol_manager_util.h"
#include "components/safe_browsing/core/browser/db/v4_store.pb.h"
#include "components/safe_browsing/core/common/proto/webui.pb.h"

namespace safe_browsing {

// Enumerate different events while applying the update fetched fom the server
// for histogramming purposes.
// DO NOT CHANGE THE ORDERING OF THESE VALUES.
enum ApplyUpdateResult { … };

// The sorted list of hash prefixes.
HashPrefixes;

HashPrefixesView;
HashPrefixMapView;

// Set a common sense limit on the store file size we try to read.
// The maximum store file size, as of today, is about 6MB.
constexpr size_t kMaxStoreSizeBytes = …;

// Stores the list of sorted hash prefixes, by size.
// For instance: {4: ["abcd", "bcde", "cdef", "gggg"], 5: ["fffff"]}
// Maps will be stored a separate file for hash prefix lists of each
// prefix size. These will be mapped into memory on initialization.
class HashPrefixMap { … };

}  // namespace safe_browsing

#endif  // COMPONENTS_SAFE_BROWSING_CORE_BROWSER_DB_HASH_PREFIX_MAP_H_