PayLoadCont.cxx

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// Copyright 2019-2020 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.
 
 
#include "ITSMFTReconstruction/PayLoadCont.h"
 
using namespace o2::itsmft;
 
constexpr size_t PayLoadCont::MinCapacity;
 
PayLoadCont::PayLoadCont(const PayLoadCont& src)
{
  mBuffer = src.mBuffer;
  if (src.mPtr) {
    mPtr = mBuffer.data() + (src.mPtr - src.mBuffer.data());
  }
  if (src.mEnd) {
    mEnd = mBuffer.data() + (src.mEnd - src.mBuffer.data());
  }
}
 
PayLoadCont& PayLoadCont::operator=(const PayLoadCont& src)
{
  if (&src != this) {
    mBuffer = src.mBuffer;
    if (src.mPtr) {
      mPtr = mBuffer.data() + (src.mPtr - src.mBuffer.data());
    }
    if (src.mEnd) {
      mEnd = mBuffer.data() + (src.mEnd - src.mBuffer.data());
    }
  }
  return *this;
}
 
void PayLoadCont::expand(size_t sz)
{
  auto* oldHead = mBuffer.data();
  if (sz < MinCapacity) {
    sz = MinCapacity;
  }
  if (sz < mBuffer.size()) { // never decrease the size
    return;
  }
  mBuffer.resize(sz);
  if (oldHead) { // fix the pointers to account for the reallocation
    int64_t diff = mBuffer.data() - oldHead;
    mPtr += diff;
    mEnd += diff;
  } else { // new buffer
    clear();
  }
}