Decoder.h

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// Copyright 2019-2026 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
#ifndef O2_FRAMEWORK_AODNATIVE_DECODER_H_
#define O2_FRAMEWORK_AODNATIVE_DECODER_H_
 
#include "AODNative/ByteSource.h"
#include "AODNative/Objects.h"
#include <cstdint>
#include <span>
#include <vector>
 
namespace o2::aod::native
{
 
void byteswapInPlace(uint8_t* data, size_t count, size_t typeSize);
 
class BranchDecoder
{
 public:
  static constexpr size_t kBooleanWindow = 64 * 1024;
 
  BranchDecoder(ByteSource& source, Options const& options);
  std::string const& url() const { return mUrl; }
 
  void decodeValues(BranchInfo const& branch, uint8_t* dst, size_t nbytes);
  void decodeVLAValues(BranchInfo const& branch, std::span<const int32_t> offsets, uint8_t* dst, size_t nbytes);
  void decodeBooleans(BranchInfo const& branch, uint8_t* bitmap, size_t nbytes);
  std::vector<int32_t> decodeOffsets(BranchInfo const& sizeBranch);
 
 private:
  struct BasketValues;
  template <typename F>
  void forEachBasket(BranchInfo const& branch, bool parallel, F&& fn);
  void checkBaskets(BranchInfo const& branch) const;
 
  ByteSource& mSource;
  Options mOptions;
  std::string mUrl;
};
 
} // namespace o2::aod::native
 
#endif // O2_FRAMEWORK_AODNATIVE_DECODER_H_