check buffer limits

java/org/jlab/coda/jevio/Utilities.java

@@ -577,7 +577,7 @@ static public void printStackTrace() {
     /**
      * This method takes a byte buffer and prints out the desired number of words
      * from the given position. Will <b>not</b> print out the extra 1, 2, or 3
-     * bytes left at the end of the buffer.
+     * bytes left at the end of the buffer. NOT thread-safe.
      *
      * @param buf       buffer to print out
      * @param position  position of data (bytes) in buffer to start printing
@@ -591,6 +591,11 @@ static public void printBuffer(ByteBuffer buf, int position, int words, String l
             return;
         }
 
+        if (position >= buf.capacity()) {
+            System.out.println("position is at or past buffer's capacity");
+            return;
+        }
+
         int origPos = buf.position();
         int origLim = buf.limit();
         // set pos = 0, lim = cap
@@ -631,6 +636,11 @@ static public void printBytes(ByteBuffer buf, int position, int bytes, String la
             return;
         }
 
+        if (position >= buf.capacity()) {
+            System.out.println("position is at or past buffer's capacity");
+            return;
+        }
+
         int origPos = buf.position();
         int origLim = buf.limit();
         // set pos = 0, lim = cap