1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/offline_pages/core/archive_validator.h"
#include <vector>
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "build/build_config.h"
namespace offline_pages {
ArchiveValidator::ArchiveValidator() = default;
ArchiveValidator::~ArchiveValidator() = default;
void ArchiveValidator::Update(base::span<const uint8_t> buffer) {
hash_.Update(buffer);
}
void ArchiveValidator::Update(std::string_view buffer) {
hash_.Update(buffer);
}
std::string ArchiveValidator::Finish() {
std::string result(crypto::hash::kSha256Size, 0);
hash_.Finish(base::as_writable_byte_span(result));
return result;
}
// static
std::string ArchiveValidator::ComputeDigest(const base::FilePath& file_path) {
std::pair<int64_t, std::string> result = GetSizeAndComputeDigest(file_path);
return result.second;
}
// static
std::pair<int64_t, std::string> ArchiveValidator::GetSizeAndComputeDigest(
const base::FilePath& file_path) {
base::File file(file_path, base::File::FLAG_OPEN | base::File::FLAG_READ);
if (!file.IsValid()) {
return std::make_pair(0LL, std::string());
}
ArchiveValidator archive_validator;
std::array<uint8_t, 1024> buffer;
int64_t total_read = 0LL;
while (true) {
std::optional<size_t> bytes_read = file.ReadAtCurrentPos(buffer);
if (!bytes_read.has_value()) {
return {0LL, std::string()};
}
if (bytes_read.value() == 0) {
return {total_read, archive_validator.Finish()};
}
total_read += bytes_read.value();
archive_validator.Update(base::span(buffer).first(*bytes_read));
}
}
// static
bool ArchiveValidator::ValidateFile(const base::FilePath& file_path,
int64_t expected_file_size,
const std::string& expected_digest) {
std::optional<int64_t> actual_file_size = base::GetFileSize(file_path);
if (!actual_file_size.has_value()) {
return false;
}
if (expected_file_size != actual_file_size.value()) {
return false;
}
std::string actual_digest = ComputeDigest(file_path);
return expected_digest == actual_digest;
}
} // namespace offline_pages
|
