Java Code Examples for ucar.unidata.io.RandomAccessFile#readBytes()

public boolean isValidFile(RandomAccessFile raf) {
  try {
    if (isCINRAD(raf)) {
      Cinrad2Record.MISSING_DATA = (byte) 0;
      return true;
    } else {
      Cinrad2Record.MISSING_DATA = (byte) 1;
    }
    raf.order(RandomAccessFile.LITTLE_ENDIAN);
    raf.seek(0);
    raf.skipBytes(14);
    short message_type = raf.readShort();
    if (message_type != 1)
      return false;

    raf.skipBytes(12);
    // data header
    byte[] b4 = raf.readBytes(4);
    int data_msecs = bytesToInt(b4, true);
    byte[] b2 = raf.readBytes(2);
    short data_julian_date = (short) bytesToShort(b2, true);
    if (data_msecs > 86400000)
      return false;
    java.util.Date dd = Cinrad2Record.getDate(data_julian_date, data_msecs);

    Calendar cal = new GregorianCalendar(new SimpleTimeZone(0, "GMT"));
    cal.clear();
    cal.setTime(dd);
    int year = cal.get(Calendar.YEAR);
    cal.setTime(new Date());
    int cyear = cal.get(Calendar.YEAR);
    return year >= 1990 && year <= cyear;
  } catch (IOException ioe) {
    return false;
  }

}
 

public boolean isCINRAD(RandomAccessFile raf) {
  int data_msecs = 0;

  try {
    raf.order(RandomAccessFile.LITTLE_ENDIAN);
    raf.seek(0);

    byte[] b128 = raf.readBytes(136);
    String radarT = new String(b128);

    if (radarT.contains("CINRAD/SC") || radarT.contains("CINRAD/CD")) {
      isSC = true;
      isCC = false;
      isCC20 = false;
      return true;
    } else if (radarT.contains("CINRADC")) {
      isCC = true;
      isSC = false;
      isCC20 = false;
      return true;
    } else if (!radarT.contains("CINRADC") && radarT.contains("CINRAD/CC")) {
      isCC20 = true;
      isSC = false;
      isCC = false;
      return true;
    } else {
      isSC = false;
      isCC = false;
      isCC20 = false;
      return false;
    }
  } catch (IOException ioe) {
    return false;
  }

}
 

public boolean isValidFile(RandomAccessFile raf) throws IOException {
  raf.seek(0);
  if (raf.length() < 60)
    return false;
  byte[] h = raf.readBytes(60);

  // 32 - 56 are X's
  for (int i = 32; i < 56; i++)
    if (h[i] != (byte) 'X')
      return false;

  try {
    short hour = Short.parseShort(new String(h, 0, 2, StandardCharsets.UTF_8));
    short minute = Short.parseShort(new String(h, 2, 2, StandardCharsets.UTF_8));
    short year = Short.parseShort(new String(h, 4, 2, StandardCharsets.UTF_8));
    short month = Short.parseShort(new String(h, 6, 2, StandardCharsets.UTF_8));
    short day = Short.parseShort(new String(h, 8, 2, StandardCharsets.UTF_8));

    if ((hour < 0) || (hour > 24))
      return false;
    if ((minute < 0) || (minute > 60))
      return false;
    if ((year < 0) || (year > 100))
      return false;
    if ((month < 0) || (month > 12))
      return false;
    if ((day < 0) || (day > 31))
      return false;

  } catch (Exception e) {
    return false;
  }

  return true;
}
 

private void readHeader(RandomAccessFile raf) throws IOException {
  byte[] h = raf.readBytes(60);

  // 12 00 070101
  short hour = Short.parseShort(new String(h, 0, 2, StandardCharsets.UTF_8));
  short minute = Short.parseShort(new String(h, 2, 2, StandardCharsets.UTF_8));
  short year = Short.parseShort(new String(h, 4, 2, StandardCharsets.UTF_8));
  short month = Short.parseShort(new String(h, 6, 2, StandardCharsets.UTF_8));
  short day = Short.parseShort(new String(h, 8, 2, StandardCharsets.UTF_8));

  int fullyear = (year > 30) ? 1900 + year : 2000 + year;

  if (cal == null) {
    cal = Calendar.getInstance();
    cal.setTimeZone(TimeZone.getTimeZone("UTC"));
  }
  cal.clear();
  cal.set(fullyear, month - 1, day, hour, minute);
  refDate = cal.getTime();

  if (showHeader)
    System.out.println(
        "\nhead=" + new String(h, StandardCharsets.UTF_8) + " date= " + dateFormatter.toDateTimeString(refDate));

  int b, count = 0;
  while ((b = raf.read()) == (int) 'X')
    count++;
  char c = (char) b;
  if (showSkip)
    System.out.println(" b=" + b + " c=" + c + " at " + raf.getFilePointer() + " skipped= " + count);
  raf.skipBytes(-1); // go back one
}
 

private int readSectionNumber(RandomAccessFile br) throws IOException {
    byte[] bytes = br.readBytes(4);
    if (new String(bytes).trim().equals("GRIB")) {
        br.seek(br.getFilePointer() - 4);
        return 0;
    } else if (bytes[0] == '7' && bytes[1] == '7' && bytes[2] == '7' && bytes[3] == '7') {
        br.seek(br.getFilePointer() - 4);
        return 8;
    } else {
        int sectionNum = br.readByte();
        br.seek(br.getFilePointer() - 5);
        return sectionNum;
    }
}
 

boolean readId(RandomAccessFile raf) throws IOException {

      filePos = raf.getFilePointer();
      byte[] reportId = raf.readBytes(40);
      String latS = new String(reportId, 0, 5, StandardCharsets.UTF_8);

      if (latS.equals("END R")) {
        raf.skipBytes(-40);
        endRecord(raf);

        filePos = raf.getFilePointer();
        reportId = raf.readBytes(40);
        latS = new String(reportId, 0, 5, StandardCharsets.UTF_8);
      }
      if (latS.equals("ENDOF")) {
        raf.skipBytes(-40);
        if (!endFile(raf))
          return false;

        filePos = raf.getFilePointer();
        reportId = raf.readBytes(40);
        latS = new String(reportId, 0, 5, StandardCharsets.UTF_8);
      }

      try {
        lat = (float) (.01 * Float.parseFloat(latS));
        lon = (float) (360.0 - .01 * Float.parseFloat(new String(reportId, 5, 5, StandardCharsets.UTF_8)));

        stationId = new String(reportId, 10, 6, StandardCharsets.UTF_8);
        obsTime = Short.parseShort(new String(reportId, 16, 4, StandardCharsets.UTF_8));
        System.arraycopy(reportId, 20, reserved, 0, 7);
        reportType = Short.parseShort(new String(reportId, 27, 3, StandardCharsets.UTF_8));
        elevMeters = Float.parseFloat(new String(reportId, 30, 5, StandardCharsets.UTF_8));
        instType = Short.parseShort(new String(reportId, 35, 2, StandardCharsets.UTF_8));
        reportLen = 10 * Integer.parseInt(new String(reportId, 37, 3, StandardCharsets.UTF_8));

        cal.setTime(refDate);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        if (obsTime / 100 > hour + 4) // if greater than 4 hours from reference time
          cal.add(Calendar.DAY_OF_MONTH, -1); // subtract a day LOOK
        cal.set(Calendar.HOUR_OF_DAY, obsTime / 100);
        cal.set(Calendar.MINUTE, 6 * (obsTime % 100));
        date = cal.getTime();

        if (showObs)
          System.out.println(this);
        else if (showTime)
          System.out.print("  time=" + obsTime + " date= " + dateFormatter.toDateTimeString(date));

        // nobs++;
        raf.skipBytes(reportLen - 40);
        return reportLen < 30000;

      } catch (IOException e) {
        throw new IOException("BAD reportId=" + new String(reportId, StandardCharsets.UTF_8) + " starts at " + filePos);
      }
    }
 

void show(RandomAccessFile raf) throws IOException {
  raf.seek(filePos);
  byte[] b = raf.readBytes(40);
  System.out.println(new String(b, StandardCharsets.UTF_8));
}