More changes to make Froyo compatible.

core/src/net/sf/openrocket/file/GeneralRocketLoader.java

@@ -12,6 +12,7 @@ import java.util.zip.ZipInputStream;
 import net.sf.openrocket.document.OpenRocketDocument;
 import net.sf.openrocket.file.openrocket.importt.OpenRocketLoader;
 import net.sf.openrocket.file.rocksim.importt.RocksimLoader;
+import net.sf.openrocket.util.ArrayUtils;
 import net.sf.openrocket.util.TextUtil;
 
 
@@ -94,7 +95,7 @@ public class GeneralRocketLoader extends AbstractRocketLoader {
 			}
 		}
 		
-		byte[] typeIdentifier = Arrays.copyOf(buffer, ROCKSIM_SIGNATURE.length);
+		byte[] typeIdentifier = ArrayUtils.copyOf(buffer, ROCKSIM_SIGNATURE.length);
 		if (Arrays.equals(ROCKSIM_SIGNATURE, typeIdentifier)) {
 			return loadUsing(source, rocksimLoader, motorFinder);
 		}

core/src/net/sf/openrocket/file/rocksim/importt/FinSetHandler.java

@@ -330,7 +330,7 @@ class FinSetHandler extends AbstractElementHandler {
      */
     private Coordinate[] toCoordinates (String pointList, WarningSet warnings) {
         List<Coordinate> result = new ArrayList<Coordinate>();
-        if (pointList != null && !pointList.isEmpty()) {
+        if (pointList != null && pointList.length() > 0) {
             String[] points = pointList.split("\\Q|\\E");
             for (String point : points) {
                 String[] aPoint = point.split(",");

core/src/net/sf/openrocket/util/ArrayUtils.java

@@ -80,4 +80,37 @@ public class ArrayUtils {
 		
 	}
 
+	public static byte[] copyOf( byte[] original, int length ) {
+		return copyOfRange(original,0,length);
+	}
+	
+	public static byte[] copyOfRange( byte[] original, int start, int end ) {
+		
+		if ( original == null ) {
+			throw new NullPointerException();
+		}
+		
+		if ( start < 0 || start > original.length ) {
+			throw new ArrayIndexOutOfBoundsException();
+		}
+		
+		if ( start > end ) {
+			throw new IllegalArgumentException();
+		}
+		
+		byte[] result = new byte[(end-start)];
+		
+		int index = 0;
+		int stop = original.length < end ? original.length : end;
+		for ( int i = start; i < stop; i ++ ) {
+			if ( i < original.length ) {
+				result[index] = original[i];
+			}
+			index++;
+		}
+		
+		return result;
+		
+	}
+
 }