Method open

LASlib/src/lasreader_asc.cpp:45–342

extern "C" FILE * fopen_compressed(const char* filename, const char* mode, bool* piped);

BOOL LASreaderASC::open(const CHAR* file_name, BOOL comma_not_point)
{
  if (file_name == 0)
  {
    laserror("file name pointer is zero");
    return FALSE;
  }

  clean();
  this->comma_not_point = comma_not_point;

  file = fopen_compressed(file_name, "r", &piped);
  if (file == 0)
  {
    laserror("cannot open file '%s'", file_name);
    return FALSE;
  }

  if (setvbuf(file, NULL, _IOFBF, 10 * LAS_TOOLS_IO_IBUFFER_SIZE) != 0)
  {
    LASMessage(LAS_WARNING, "setvbuf() failed with buffer size %d", 10 * LAS_TOOLS_IO_IBUFFER_SIZE);
  }

  // clean the header

  header.clean();

  // populate the header as much as it makes sense

  snprintf(header.system_identifier, LAS_HEADER_CHAR_LEN, LAS_TOOLS_COPYRIGHT);
  snprintf(header.generating_software, LAS_HEADER_CHAR_LEN, "via LASreaderASC (%d)", LAS_TOOLS_VERSION);

  // maybe set creation date

#ifdef _WIN32
  WIN32_FILE_ATTRIBUTE_DATA attr;
  SYSTEMTIME creation;
  GetFileAttributesEx(file_name, GetFileExInfoStandard, &attr);
  FileTimeToSystemTime(&attr.ftCreationTime, &creation);
  int startday[13] = { -1, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
  header.file_creation_day = startday[creation.wMonth] + creation.wDay;
  header.file_creation_year = creation.wYear;
  // leap year handling
  if ((((creation.wYear) % 4) == 0) && (creation.wMonth > 2)) header.file_creation_day++;
#else
  header.file_creation_day = 333;
  header.file_creation_year = 2012;
#endif

  header.point_data_format = 0;
  header.point_data_record_length = 20;

  // initialize point

  point.init(&header, header.point_data_format, header.point_data_record_length, &header);

  // read header of ASC file