images/src/main/java/com/stanfy/enroscar/images/MarkableInputStream.java
private void skip(long current, long target) throws IOException {
    while (current < target) {
      long skipped = in.skip(target - current);
      current += skipped;
    }
  }
private void skip(long current, long target) throws IOException {
    while (current < target) {
      long skipped = in.skip(target - current);
      current += skipped;
    }
  }
Skips {@code target - current} bytes and returns.