text: /*
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program 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 General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   *
   * The Original Code is Copyright (C) 2015 Blender Foundation.
   * All rights reserved.
   */
  
  #include "openvdb_reader.h"
  #include "openvdb_util.h"
  
  OpenVDBReader::OpenVDBReader() : m_meta_map(new openvdb::MetaMap), m_file(NULL)
  {
    /* Although it is safe, it may not be good to have this here, could be done
     * once instead of everytime we read a file. */
    openvdb::initialize();
  }
  
  OpenVDBReader::~OpenVDBReader()
  {
    cleanupFile();
  }
  
  void OpenVDBReader::open(const openvdb::Name &filename)
  {
    cleanupFile();
  
    try {
      m_file = new openvdb::io::File(filename);
      m_file->setCopyMaxBytes(0);
      m_file->open();
  
      m_meta_map = m_file->getMetadata();
    }
    /* Mostly to catch exceptions related to Blosc not being supported. */
    catch (const openvdb::IoError &e) {
      std::cerr << e.what() << '\n';
      cleanupFile();
    }
  }
  
  void OpenVDBReader::floatMeta(const openvdb::Name &name, float &value) const
  {
    try {
      value = m_meta_map->metaValue<float>(name);
    }
    CATCH_KEYERROR;
  }
  
  void OpenVDBReader::intMeta(const openvdb::Name &name, int &value) const
  {
    try {
      value = m_meta_map->metaValue<int>(name);
    }
    CATCH_KEYERROR;
  }
  
  void OpenVDBReader::vec3sMeta(const openvdb::Name &name, float value[3]) const
  {
    try {
      openvdb::Vec3s meta_val = m_meta_map->metaValue<openvdb::Vec3s>(name);
  
      value[0] = meta_val.x();
      value[1] = meta_val.y();
      value[2] = meta_val.z();
    }
    CATCH_KEYERROR;
  }
  
  void OpenVDBReader::vec3IMeta(const openvdb::Name &name, int value[3]) const
  {
    try {
      openvdb::Vec3i meta_val = m_meta_map->metaValue<openvdb::Vec3i>(name);
  
      value[0] = meta_val.x();
      value[1] = meta_val.y();
      value[2] = meta_val.z();
    }
    CATCH_KEYERROR;
  }
  
  void OpenVDBReader::mat4sMeta(const openvdb::Name &name, float value[4][4]) const
  {
    try {
      openvdb::Mat4s meta_val = m_meta_map->metaValue<openvdb::Mat4s>(name);
  
      for (int i = 0; i < 4; ++i) {
        for (int j = 0; j < 4; ++j) {
          value[i][j] = meta_val[i][j];
        }
      }
    }
    CATCH_KEYERROR;
  }
  
  bool OpenVDBReader::hasGrid(const openvdb::Name &name) const
  {
    return m_file->hasGrid(name);
  }
  
  openvdb::GridBase::Ptr OpenVDBReader::getGrid(const openvdb::Name &name) const
  {
    return m_file->readGrid(name);
  }
  
  size_t OpenVDBReader::numGrids() const
  {
    return m_file->getGrids()->size();
  }
  
  void OpenVDBReader::cleanupFile()
  {
    if (m_file) {
      m_file->close();
      delete m_file;
    }
  }
  