Method init

src/lasreaditemcompressed_v4.cpp:409–707

}

BOOL LASreadItemCompressed_POINT14_v4::init(const U8* item, U32& context)
{
  /* for layered compression 'dec' only hands over the stream */

  ByteStreamIn* instream = dec->getByteStreamIn();

  /* on the first init create instreams and decoders */

  if (instream_channel_returns_XY == 0)
  {
    /* create instreams */

    if (Endian::IS_LITTLE_ENDIAN)
    {
      instream_channel_returns_XY = new ByteStreamInArrayLE();
      instream_Z = new ByteStreamInArrayLE();
      instream_classification = new ByteStreamInArrayLE();
      instream_flags = new ByteStreamInArrayLE();
      instream_intensity = new ByteStreamInArrayLE();
      instream_scan_angle = new ByteStreamInArrayLE();
      instream_user_data = new ByteStreamInArrayLE();
      instream_point_source = new ByteStreamInArrayLE();
      instream_gps_time = new ByteStreamInArrayLE();
    }
    else
    {
      instream_channel_returns_XY = new ByteStreamInArrayBE();
      instream_Z = new ByteStreamInArrayBE();
      instream_classification = new ByteStreamInArrayBE();
      instream_flags = new ByteStreamInArrayBE();
      instream_intensity = new ByteStreamInArrayBE();
      instream_scan_angle = new ByteStreamInArrayBE();
      instream_user_data = new ByteStreamInArrayBE();
      instream_point_source = new ByteStreamInArrayBE();
      instream_gps_time = new ByteStreamInArrayBE();
    }

    /* create decoders */

    dec_channel_returns_XY = new ArithmeticDecoder();
    dec_Z = new ArithmeticDecoder();
    dec_classification = new ArithmeticDecoder();
    dec_flags = new ArithmeticDecoder();
    dec_intensity = new ArithmeticDecoder();
    dec_scan_angle = new ArithmeticDecoder();
    dec_user_data = new ArithmeticDecoder();
    dec_point_source = new ArithmeticDecoder();
    dec_gps_time = new ArithmeticDecoder();
  }

  /* how many bytes do we need to read */
  
  U32 num_bytes = num_bytes_channel_returns_XY;
  if (requested_Z) num_bytes += num_bytes_Z; 
  if (requested_classification) num_bytes += num_bytes_classification; 
  if (requested_flags) num_bytes += num_bytes_flags; 
  if (requested_intensity) num_bytes += num_bytes_intensity;
  if (requested_scan_angle) num_bytes += num_bytes_scan_angle;