incremental_utils.h

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/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#pragma once
 
#include "adb_unique_fd.h"
 
#include <optional>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
 
#include <stdint.h>
 
#include <android-base/off64_t.h>
 
namespace incremental {
 
using Size = int64_t;
constexpr int kBlockSize = 4096;
constexpr int kSha256DigestSize = 32;
constexpr int kDigestSize = kSha256DigestSize;
constexpr int kMaxSignatureSize = 8096;  // incrementalfs.h
 
constexpr std::string_view IDSIG = ".idsig";
 
std::vector<int32_t> PriorityBlocksForFile(const std::string& filepath, borrowed_fd fd,
                                           Size fileSize);
 
Size verity_tree_blocks_for_file(Size fileSize);
Size verity_tree_size_for_file(Size fileSize);
 
std::optional<std::pair<std::vector<char>, int32_t>> read_id_sig_headers(borrowed_fd fd,
                                                                         std::string* error);
std::optional<std::pair<off64_t, ssize_t>> skip_id_sig_headers(borrowed_fd fd, std::string* error);
 
}  // namespace incremental