src/trace_processor/util/stream_decompressor.cc

/*
 * Copyright (C) 2026 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "src/trace_processor/util/stream_decompressor.h"

#include <cstring>

namespace perfetto::trace_processor::util {

// Out-of-line to anchor the vtable to a single translation unit.
StreamDecompressor::~StreamDecompressor() = default;

CompressionType DetectCompression(const uint8_t* data, size_t size) {
  if (size >= sizeof(kZstdMagic) &&
      memcmp(data, kZstdMagic, sizeof(kZstdMagic)) == 0) {
    return CompressionType::kZstd;
  }
  if (size >= sizeof(kGzipMagic) &&
      memcmp(data, kGzipMagic, sizeof(kGzipMagic)) == 0) {
    return CompressionType::kGzip;
  }
  return CompressionType::kNone;
}

CompressionType DetectPacketCompression(const uint8_t* data, size_t size) {
  return DetectCompression(data, size) == CompressionType::kZstd
             ? CompressionType::kZstd
             : CompressionType::kGzip;
}

}  // namespace perfetto::trace_processor::util