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// Copyright 2021 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/reporting/compression/decompression.h"
#include <string>
#include <utility>
#include "base/bind.h"
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/metrics/histogram_functions.h"
#include "base/strings/string_piece.h"
#include "base/task/thread_pool.h"
#include "components/reporting/proto/synced/record.pb.h"
#include "third_party/snappy/src/snappy.h"
namespace reporting {
namespace {
std::string DecompressRecordSnappy(std::string record) {
// Compression is enabled and crosses the threshold,
std::string output;
snappy::Uncompress(record.data(), record.size(), &output);
return output;
}
} // namespace
// static
scoped_refptr<Decompression> Decompression::Create() {
return base::WrapRefCounted(new Decompression());
}
std::string Decompression::DecompressRecord(
std::string record,
CompressionInformation compression_information) {
// Decompress
switch (compression_information.compression_algorithm()) {
case CompressionInformation::COMPRESSION_NONE: {
// Don't decompress, simply return serialized record
return record;
}
case CompressionInformation::COMPRESSION_SNAPPY: {
return DecompressRecordSnappy(std::move(record));
}
}
}
Decompression::Decompression() = default;
Decompression::~Decompression() = default;
} // namespace reporting
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