public boolean isValidFile(RandomAccessFile raf) {
int data_msecs = 0;
short data_julian_date = 0;
try {
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);
data_msecs = bytesToInt(b4, true);
byte[] b2 = raf.readBytes(2);
data_julian_date = (short) bytesToShort(b2, true);
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);
if (year < 1990 || year > cyear) return false;
return true;
} catch (IOException ioe) {
return false;
}
}
/** Check if this is a valid SIGMET-IRIS file for this IOServiceProvider. */
public boolean isValidFile(ucar.unidata.io.RandomAccessFile raf) {
try {
raf.order(RandomAccessFile.LITTLE_ENDIAN);
// The first struct in the file is the product_hdr, which will have the
// standard structure_header, followed by other embedded structures.
// Each of these structures also have a structure header. To validate
// the file we check for a product_hdr (by looking for type 27 in the
// structure_header), then a product_configuration structure (by looking
// for type 26 in its structure_header), then checking that that
// the product_configuration does indicate a type of RAW data (type 15)
raf.seek(0);
short[] data = new short[13];
raf.readShort(data, 0, 13);
return (data[0] == (short) 27 && data[6] == (short) 26 && data[12] == (short) 15);
} catch (IOException ioe) {
System.out.println("In isValidFile(): " + ioe.toString());
return false;
}
}
/**
* Read some global data from SIGMET file. The SIGMET file consists of records with fixed
* length=6144 bytes.
*/
public static java.util.Map<String, Number> readRecordsHdr(ucar.unidata.io.RandomAccessFile raf) {
java.util.Map<String, Number> recHdr1 = new java.util.HashMap<String, Number>();
try {
int nparams = 0;
// -- Read from <product_end> of the 1st record -- 12+320+120
// -- Calculate Nyquist velocity --------------------
raf.seek(452);
int prf = raf.readInt();
raf.seek(480);
int wave = raf.readInt();
float vNyq = calcNyquist(prf, wave);
recHdr1.put("vNyq", vNyq);
// -- Read from the 2nd record----------- 6144+12(strucr_hdr)+168(from ingest_config)
raf.seek(6324);
int radar_lat = raf.readInt();
int radar_lon = raf.readInt(); // 6328
short ground_height = raf.readShort(); // 6332
short radar_height = raf.readShort(); // 6334
raf.skipBytes(4);
short num_rays = raf.readShort(); // 6340
raf.skipBytes(2);
int radar_alt = raf.readInt(); // 6344
raf.seek(6648);
int time_beg = raf.readInt();
raf.seek(6652);
int time_end = raf.readInt();
raf.seek(6772);
int data_mask = raf.readInt();
for (int j = 0; j < 32; j++) {
nparams += ((data_mask >> j) & (0x1));
}
raf.seek(6912);
short multiprf = raf.readShort();
raf.seek(7408);
int range_first = raf.readInt(); // cm 7408
int range_last = raf.readInt(); // cm 7412
raf.skipBytes(2);
short bins = raf.readShort(); // 7418
if (bins % 2 != 0) bins = (short) (bins + 1);
raf.skipBytes(4);
int step = raf.readInt(); // cm 7424
raf.seek(7574);
short number_sweeps = raf.readShort(); // 7574
raf.seek(12312);
int base_time = raf.readInt(); // <ingest_data_header> 3d rec
raf.skipBytes(2);
short year = raf.readShort();
short month = raf.readShort();
short day = raf.readShort();
recHdr1.put("radar_lat", calcAngle(radar_lat));
recHdr1.put("radar_lon", calcAngle(radar_lon));
recHdr1.put("range_first", range_first);
recHdr1.put("range_last", range_last);
recHdr1.put("ground_height", ground_height);
recHdr1.put("radar_height", radar_height);
recHdr1.put("radar_alt", radar_alt);
recHdr1.put("step", step);
recHdr1.put("bins", bins); // System.out.println(" bins="+bins);
recHdr1.put("num_rays", num_rays); // System.out.println(" rays="+num_rays);
recHdr1.put("nparams", nparams); // System.out.println(" nparams="+nparams);
recHdr1.put("multiprf", multiprf);
recHdr1.put(
"number_sweeps",
number_sweeps); // System.out.println("IN HDR: number_sweeps="+number_sweeps);
recHdr1.put("year", year);
recHdr1.put("month", month);
recHdr1.put("day", day);
recHdr1.put("base_time", base_time);
} catch (Exception e) {
System.out.println(e.toString());
e.printStackTrace();
}
return recHdr1;
}
