1 /*
2  * Copyright (C) 2020 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include "adb_unique_fd.h"
20 
21 #include <string>
22 #include <string_view>
23 #include <utility>
24 #include <vector>
25 
26 #include <stdint.h>
27 
28 #include <android-base/off64_t.h>
29 
30 namespace incremental {
31 
32 using Size = int64_t;
33 constexpr int kBlockSize = 4096;
34 constexpr int kSha256DigestSize = 32;
35 constexpr int kDigestSize = kSha256DigestSize;
36 constexpr int kMaxSignatureSize = 8096;  // incrementalfs.h
37 
38 constexpr std::string_view IDSIG = ".idsig";
39 
40 std::vector<int32_t> PriorityBlocksForFile(const std::string& filepath, borrowed_fd fd,
41                                            Size fileSize);
42 
43 Size verity_tree_blocks_for_file(Size fileSize);
44 Size verity_tree_size_for_file(Size fileSize);
45 
46 std::pair<std::vector<char>, int32_t> read_id_sig_headers(borrowed_fd fd);
47 std::pair<off64_t, ssize_t> skip_id_sig_headers(borrowed_fd fd);
48 
49 }  // namespace incremental
50