PacketProgressionState.h

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/*
 *    Copyright (C) 2016-2026 Grok Image Compression Inc.
 *
 *    This source code is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This source code is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 
#pragma once
 
#include <vector>
 
namespace grk
{

struct PacketProgressionState
{
  PacketProgressionState() : PacketProgressionState(0) {}
  explicit PacketProgressionState(uint8_t totalResolutions)
      : totalResolutions_(totalResolutions), resLayers_(totalResolutions, 0)
  {}

  uint8_t numResolutionsRead(void) const
  {
    // Start by assuming no non-zero element is found
    int maxIndex = -1;
 
    // Iterate over the vector to find the last non-zero element's index
    for(uint8_t i = 0; i < resLayers_.size(); ++i)
    {
      if(resLayers_[i] != 0U)
        maxIndex = i; // Update maxIndex with the current non-zero element's index
    }
 
    // If no non-zero element was found, return 0. Otherwise, return maxIndex + 1
    return (maxIndex != -1) ? static_cast<uint8_t>(maxIndex + 1) : 0;
  }

  uint8_t totalResolutions_;
  std::vector<uint16_t> resLayers_;
};
 
} // namespace grk