content: /*
   * Copyright 2002-2019 Drew Noakes and contributors
   *
   *    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
   *
   *        https://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.
   *
   * More information about this project is available at:
   *
   *    https://drewnoakes.com/code/exif/
   *    https://github.com/drewnoakes/metadata-extractor
   */
  package com.drew.imaging.quicktime;
  
  import com.drew.imaging.FileType;
  import com.drew.imaging.TypeChecker;
  
  import java.util.HashMap;
  
  public class QuickTimeTypeChecker implements TypeChecker
  {
      private static final HashMap<String, FileType> _ftypMap;
  
      static
      {
          _ftypMap = new HashMap<String, FileType>();
  
          // https://www.ftyps.com
  
          // QuickTime Mov
          _ftypMap.put("moov", FileType.QuickTime);
          _ftypMap.put("wide", FileType.QuickTime);
          _ftypMap.put("mdat", FileType.QuickTime);
          _ftypMap.put("free", FileType.QuickTime);
          _ftypMap.put("qt  ", FileType.QuickTime);
          _ftypMap.put("3g2a", FileType.QuickTime);
  
          // MP4
          _ftypMap.put("3gp5", FileType.Mp4);
          _ftypMap.put("avc1", FileType.Mp4);
          _ftypMap.put("iso2", FileType.Mp4);
          _ftypMap.put("isom", FileType.Mp4);
          _ftypMap.put("M4A ", FileType.Mp4);
          _ftypMap.put("M4B ", FileType.Mp4);
          _ftypMap.put("M4P ", FileType.Mp4);
          _ftypMap.put("M4V ", FileType.Mp4);
          _ftypMap.put("M4VH", FileType.Mp4);
          _ftypMap.put("M4VP", FileType.Mp4);
          _ftypMap.put("mmp4", FileType.Mp4);
          _ftypMap.put("mp41", FileType.Mp4);
          _ftypMap.put("mp42", FileType.Mp4);
          _ftypMap.put("mp71", FileType.Mp4);
          _ftypMap.put("MSNV", FileType.Mp4);
          _ftypMap.put("NDAS", FileType.Mp4);
          _ftypMap.put("NDSC", FileType.Mp4);
          _ftypMap.put("NDSH", FileType.Mp4);
          _ftypMap.put("NDSM", FileType.Mp4);
          _ftypMap.put("NDSP", FileType.Mp4);
          _ftypMap.put("NDSS", FileType.Mp4);
          _ftypMap.put("NDXC", FileType.Mp4);
          _ftypMap.put("NDXH", FileType.Mp4);
          _ftypMap.put("NDXM", FileType.Mp4);
          _ftypMap.put("NDXP", FileType.Mp4);
          _ftypMap.put("NDXS", FileType.Mp4);
          _ftypMap.put("nvr1", FileType.Mp4);
  
          // HEIF
          _ftypMap.put("mif1", FileType.Heif);
          _ftypMap.put("msf1", FileType.Heif);
          _ftypMap.put("heic", FileType.Heif);
          _ftypMap.put("heix", FileType.Heif);
          _ftypMap.put("hevc", FileType.Heif);
          _ftypMap.put("hevx", FileType.Heif);
  
          // AVIF
          _ftypMap.put("avif", FileType.Avif);
  
          // CRX
          _ftypMap.put("crx ", FileType.Crx);
      }
  
      @Override
      public int getByteCount()
      {
          return 12;
      }
  
      @Override
      public FileType checkType(byte[] bytes)
      {
          // Test at offset 4 for Base Media Format (i.e. QuickTime, MP4, etc...) identifier "ftyp"
          // plus four identifying characters.
  
          if (bytes[4] == 'f' &&
              bytes[5] == 't' &&
              bytes[6] == 'y' &&
              bytes[7] == 'p') {
  
              String fourCC = new String(bytes, 8, 4);
  
              FileType t = _ftypMap.get(fourCC);
  
              if (t != null)
                  return t;
  
              return FileType.QuickTime;
          }
  
          return FileType.Unknown;
      }
  }
  