String format = String.format("%%%ds", fieldsPerLine + (fieldsPerLine - 1) / this.extraSpaceAfterEvery);
        this.prototypeLine = String.format(format, "");
    }

    /** String builder for current output line. */
    private StringBuilder buffer = new StringBuilder();

    @Override
    public String getResult()
    {
        String result = this.buffer.toString();
        this.buffer.setLength(0);
        return result;
    }

    @Override
    public int getMaximumWidth()
    {
        return this.prototypeLine.length();
    }

    @Override
    public boolean append(final int address, final byte theByte) throws IOException
    {
        if (this.buffer.length() == 0)
        {
            this.buffer.append(this.prototypeLine);
        }
        int lineByte = address % this.fieldsPerLine;
        int index = lineByte + lineByte / this.extraSpaceAfterEvery;