Method append

LASzip/src/lasindex.cpp:321–460

}

BOOL LASindex::append(const char* file_name) const
{
#ifdef LASZIPDLL_EXPORTS
  return FALSE;
#else
  LASreadOpener lasreadopener;

  if (file_name == 0) return FALSE;

  // open reader

  LASreader* lasreader = lasreadopener.open(file_name);
  if (lasreader == 0) return FALSE;
  if (lasreader->header.laszip == 0) return FALSE;

  // close reader

  lasreader->close();

  FILE* file = LASfopen(file_name, "rb");

  ByteStreamIn* bytestreamin = 0;
  if (Endian::IS_LITTLE_ENDIAN)
    bytestreamin = new ByteStreamInFileLE(file);
  else
    bytestreamin = new ByteStreamInFileBE(file);

  // maybe write LASindex EVLR start position into LASzip VLR

  I64 offset_laz_vlr = -1;

  // where to write LASindex EVLR that will contain the LAX file

  I64 number_of_special_evlrs = lasreader->header.laszip->number_of_special_evlrs;
  I64 offset_to_special_evlrs = lasreader->header.laszip->offset_to_special_evlrs;

  if ((number_of_special_evlrs == -1) && (offset_to_special_evlrs == -1))
  {
    bytestreamin->seekEnd();
    number_of_special_evlrs = 1;
    offset_to_special_evlrs = bytestreamin->tell();

    // find LASzip VLR

    I64 total = lasreader->header.header_size + 2;
    U32 number_of_variable_length_records = lasreader->header.number_of_variable_length_records + 1 + (lasreader->header.vlr_lastiling != 0) + (lasreader->header.vlr_lasoriginal != 0);

    for (U32 u = 0; u < number_of_variable_length_records; u++)
    {
      bytestreamin->seek(total);

      CHAR user_id[LAS_VLR_USER_ID_CHAR_LEN];
      try { bytestreamin->getBytes((U8*)user_id, 16); } catch(...)
      {
        laserror("reading header.vlrs[%d].user_id", u);
        return FALSE;
      }
      if (strcmp(user_id, "laszip encoded") == 0)