public boolean canSeekBackwards() {
        return false;
    }
Returns <code>true</code> if this object supports calls to
<code>seek(pos)</code> with an offset <code>pos</code> smaller
than the current offset, as returned by <code>getFilePointer</code>.
plugins/svg-plugin/batik-codec-fix/src/main/java/org/apache/batik/ext/awt/image/codec/util/SeekableStream.java