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// 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.
#ifndef CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_EVENT_LOG_MANAGER_UNITTEST_HELPERS_H_
#define CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_EVENT_LOG_MANAGER_UNITTEST_HELPERS_H_
#include <memory>
#include <string>
#include "base/files/file_path.h"
#include "build/build_config.h"
#include "chrome/browser/media/webrtc/webrtc_event_log_manager_common.h"
namespace webrtc_event_logging {
// Which type of compression, if any, LogFileWriterTest should use.
enum class WebRtcEventLogCompression {
NONE,
GZIP_NULL_ESTIMATION,
GZIP_PERFECT_ESTIMATION
};
// Produce a LogFileWriter::Factory object.
std::unique_ptr<LogFileWriter::Factory> CreateLogFileWriterFactory(
WebRtcEventLogCompression compression);
#if BUILDFLAG(IS_POSIX)
void RemoveWritePermissions(const base::FilePath& path);
#endif // BUILDFLAG(IS_POSIX)
// Always estimates strings to be compressed to zero bytes.
class NullEstimator : public CompressedSizeEstimator {
public:
class Factory : public CompressedSizeEstimator::Factory {
public:
~Factory() override = default;
std::unique_ptr<CompressedSizeEstimator> Create() const override;
};
~NullEstimator() override = default;
size_t EstimateCompressedSize(const std::string& input) const override;
};
// Provides a perfect estimation of the compressed size by cheating - performing
// actual compression, then reporting the resulting size.
// This class is stateful; the number, nature and order of calls to
// EstimateCompressedSize() is important.
class PerfectGzipEstimator : public CompressedSizeEstimator {
public:
class Factory : public CompressedSizeEstimator::Factory {
public:
~Factory() override = default;
std::unique_ptr<CompressedSizeEstimator> Create() const override;
};
PerfectGzipEstimator();
~PerfectGzipEstimator() override;
size_t EstimateCompressedSize(const std::string& input) const override;
private:
// This compressor allows EstimateCompressedSize to return an exact estimate.
// EstimateCompressedSize is normally const, but here we fake it, so we set
// it as mutable.
mutable std::unique_ptr<LogCompressor> compressor_;
};
// Check the gzipped size of |uncompressed|, including header and footer,
// assuming it were gzipped on its own.
size_t GzippedSize(const std::string& uncompressed);
// Same as other version, but with elements compressed in sequence.
size_t GzippedSize(const std::vector<std::string>& uncompressed);
} // namespace webrtc_event_logging
#endif // CHROME_BROWSER_MEDIA_WEBRTC_WEBRTC_EVENT_LOG_MANAGER_UNITTEST_HELPERS_H_
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