public String readNextAsciiString(int length) throws IOException {
        String s = readAsciiString(currentIndex, length);
        currentIndex+=length;
        return s;
    }
Reads an Ascii string of <code>length</code>
characters starting at the current index and then increments the current
index by <code>length</code>.

@return the Ascii string at the current index
GPL/DMG/src/dmg/java/mobiledevices/dmg/ghidra/GBinaryReader.java