public String readNextUnicodeString(int length) throws IOException {
        String s = readUnicodeString(currentIndex, length);
        currentIndex+=(length*2);
        return s;
    }
Reads the unicode string at the current index and then increments the current
index by <code>length</code>.
@return the unicode string at the current index
@exception IOException if an I/O error occurs
GPL/DMG/src/dmg/java/mobiledevices/dmg/ghidra/GBinaryReader.java