예제 #1
0
 /**
  * Swap the grid header, avoiding strings
  *
  * @param gh grid header to swap
  */
 private void swapGridHeader(int[] gh) {
   McIDASUtil.flip(gh, 0, 5);
   McIDASUtil.flip(gh, 7, 7);
   McIDASUtil.flip(gh, 9, 10);
   McIDASUtil.flip(gh, 12, 14);
   McIDASUtil.flip(gh, 32, 51);
 }
예제 #2
0
  /**
   * Initialize this reader. Get the Grid specific info
   *
   * @param fullCheck for a full check reading grids
   * @return true if successful
   * @throws IOException problem reading the data
   */
  protected boolean init(boolean fullCheck) throws IOException {
    if (rf == null) {
      logError("File is null");
      return false;
    }
    gridIndex = new GridIndex(rf.getLocation());

    rf.order(RandomAccessFile.BIG_ENDIAN);
    int numEntries = Math.abs(readInt(10));
    if (numEntries > 1000000) {
      needToSwap = true;
      numEntries = Math.abs(McIDASUtil.swbyt4(numEntries));
    }
    if (numEntries > MAX_GRIDS) {
      return false;
    }
    // System.out.println("need to Swap = " + needToSwap);
    // System.out.println("number entries="+numEntries);

    // go back to the beginning
    rf.seek(0);
    // read the fileheader
    String label = rf.readString(32);
    // GEMPAK too closely like McIDAS
    if (label.indexOf("GEMPAK DATA MANAGEMENT FILE") >= 0) {
      logError("label indicates this is a GEMPAK grid");
      return false;
    } else { // check that they are all printable ASCII chars
      for (int i = 0; i < label.length(); i++) {
        String s0 = label.substring(i, i + 1);
        if (!(0 <= s0.compareTo(" ") && s0.compareTo("~") <= 0)) {
          logError("bad label, not a McIDAS grid");
          return false;
        }
      }
    }

    // System.out.println("label = " + label);

    int project = readInt(8);
    // System.out.println("Project = " + project);

    int date = readInt(9);
    // dates are supposed to be yyyddd, but account for ccyyddd up to year 4000
    if ((date < 10000) || (date > 400000)) {
      logError("date wrong, not a McIDAS grid");
      return false;
    }
    // System.out.println("date = " + date);

    int[] entries = new int[numEntries];
    for (int i = 0; i < numEntries; i++) {
      entries[i] = readInt(i + 11);
      // sanity check that this is indeed a McIDAS Grid file
      if (entries[i] < -1) {
        logError("bad grid offset " + i + ": " + entries[i]);
        return false;
      }
    }
    if (!fullCheck) {
      return true;
    }

    // Don't swap:
    rf.order(RandomAccessFile.BIG_ENDIAN);
    for (int i = 0; i < numEntries; i++) {
      if (entries[i] == -1) {
        continue;
      }
      int[] header = new int[64];
      rf.seek(entries[i] * 4);
      rf.readInt(header, 0, 64);
      if (needToSwap) {
        swapGridHeader(header);
      }
      try {

        McIDASGridRecord gr = new McIDASGridRecord(entries[i], header);
        // if (gr.getGridDefRecordId().equals("CONF X:93 Y:65")) {
        // if (gr.getGridDefRecordId().equals("CONF X:54 Y:47")) {
        // figure out how to handle Mercator projections
        // if ( !(gr.getGridDefRecordId().startsWith("MERC"))) {
        gridIndex.addGridRecord(gr);
        if (gdsMap.get(gr.getGridDefRecordId()) == null) {
          McGridDefRecord mcdef = gr.getGridDefRecord();
          // System.out.println("new nav " + mcdef.toString());
          gdsMap.put(mcdef.toString(), mcdef);
          gridIndex.addHorizCoordSys(mcdef);
        }
        // }
      } catch (McIDASException me) {
        logError("problem creating grid dir");
        return false;
      }
    }
    // check to see if there are any grids that we can handle
    if (gridIndex.getGridRecords().isEmpty()) {
      logError("no grids found");
      return false;
    }
    return true;
  }