code: public ZipEntry getEntry(String name) {
          if (name == null) {
              throw new NullPointerException("name");
          }
          long jzentry = 0;
          synchronized (this) {
              ensureOpen();
              jzentry = getEntry(jzfile, zc.getBytes(name), true);
              if (jzentry != 0) {
                  ZipEntry ze = getZipEntry(name, jzentry);
                  freeEntry(jzfile, jzentry);
                  return ze;
              }
          }
          return null;
      }
docs: Returns the zip file entry for the specified name, or null
  if not found.
  
  @param name the name of the entry
  @return the zip file entry, or null if not found
  @throws IllegalStateException if the zip file has been closed