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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
// 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 "chrome/browser/media/webrtc/webrtc_event_log_manager_unittest_helpers.h"
#include "base/check.h"
#include "base/files/file_util.h"
#include "base/notreached.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace webrtc_event_logging {
// Produce a LogFileWriter::Factory object.
std::unique_ptr<LogFileWriter::Factory> CreateLogFileWriterFactory(
WebRtcEventLogCompression compression) {
switch (compression) {
case WebRtcEventLogCompression::NONE:
return std::make_unique<BaseLogFileWriterFactory>();
case WebRtcEventLogCompression::GZIP_NULL_ESTIMATION:
return std::make_unique<GzippedLogFileWriterFactory>(
std::make_unique<GzipLogCompressorFactory>(
std::make_unique<NullEstimator::Factory>()));
case WebRtcEventLogCompression::GZIP_PERFECT_ESTIMATION:
return std::make_unique<GzippedLogFileWriterFactory>(
std::make_unique<GzipLogCompressorFactory>(
std::make_unique<PerfectGzipEstimator::Factory>()));
}
NOTREACHED();
}
#if BUILDFLAG(IS_POSIX)
void RemoveWritePermissions(const base::FilePath& path) {
int permissions;
ASSERT_TRUE(base::GetPosixFilePermissions(path, &permissions));
constexpr int write_permissions = base::FILE_PERMISSION_WRITE_BY_USER |
base::FILE_PERMISSION_WRITE_BY_GROUP |
base::FILE_PERMISSION_WRITE_BY_OTHERS;
permissions &= ~write_permissions;
ASSERT_TRUE(base::SetPosixFilePermissions(path, permissions));
}
#endif // BUILDFLAG(IS_POSIX)
std::unique_ptr<CompressedSizeEstimator> NullEstimator::Factory::Create()
const {
return std::make_unique<NullEstimator>();
}
size_t NullEstimator::EstimateCompressedSize(const std::string& input) const {
return 0;
}
std::unique_ptr<CompressedSizeEstimator> PerfectGzipEstimator::Factory::Create()
const {
return std::make_unique<PerfectGzipEstimator>();
}
PerfectGzipEstimator::PerfectGzipEstimator() {
// This factory will produce an optimistic compressor that will always
// think it can compress additional inputs, which will therefore allow
// us to find out what the real compressed size it, since compression
// will never be suppressed.
GzipLogCompressorFactory factory(std::make_unique<NullEstimator::Factory>());
compressor_ = factory.Create(std::optional<size_t>());
DCHECK(compressor_);
std::string ignored;
compressor_->CreateHeader(&ignored);
}
PerfectGzipEstimator::~PerfectGzipEstimator() = default;
size_t PerfectGzipEstimator::EstimateCompressedSize(
const std::string& input) const {
std::string output;
EXPECT_EQ(compressor_->Compress(input, &output), LogCompressor::Result::OK);
return output.length();
}
size_t GzippedSize(const std::string& uncompressed) {
PerfectGzipEstimator perfect_estimator;
return kGzipOverheadBytes +
perfect_estimator.EstimateCompressedSize(uncompressed);
}
size_t GzippedSize(const std::vector<std::string>& uncompressed) {
PerfectGzipEstimator perfect_estimator;
size_t result = kGzipOverheadBytes;
for (const std::string& str : uncompressed) {
result += perfect_estimator.EstimateCompressedSize(str);
}
return result;
}
} // namespace webrtc_event_logging
|
