class CMap {

    private List<CodespaceRange> codeSpaceRanges = new ArrayList<>();
    private Map<Integer, String> singleByteMappings = new HashMap<>();
    private Map<Integer, String> doubleByteMappings = new HashMap<>();

    /**
     * Creates a new instance of CMap.
     */
    public CMap() {
        //default constructor
    }

    /**
     * This will tell if this cmap has any one byte mappings.
     *
     * @return true If there are any one byte mappings, false otherwise.
     */
    public boolean hasOneByteMappings() {
        return !singleByteMappings.isEmpty();
    }

    /**
     * This will tell if this cmap has any two byte mappings.
     *
     * @return true If there are any two byte mappings, false otherwise.
     */
    public boolean hasTwoByteMappings() {
        return !doubleByteMappings.isEmpty();
    }

    /**
     * This will perform a lookup into the map.
     * <p>
     * Some characters (e.g. ligatures) decode to character sequences.
     *
     * @param code The code used to lookup.
     * @return The string that matches the lookup.
     */
    public String lookup(char code) {
        String result = null;
        if (hasTwoByteMappings()) {
            result = doubleByteMappings.get((int) code);
        }
        if (result == null && code <= 0xff && hasOneByteMappings()) {
            result = singleByteMappings.get(code & 0xff);
        }
        return result;
    }

    /**
     * This will perform a lookup into the map.
     *
     * @param code   The code used to lookup.
     * @param offset The offset into the byte array.
     * @param length The length of the data we are getting.
     * @return The string that matches the lookup.
     */
    public String lookup(byte[] code, int offset, int length) {

        String result = null;
        Integer key = null;
        if (length == 1) {

            key = code[offset] & 0xff;
            result = singleByteMappings.get(key);
        } else if (length == 2) {
            int intKey = code[offset] & 0xff;
            intKey <<= 8;
            intKey += code[offset + 1] & 0xff;
            key = intKey;

            result = doubleByteMappings.get(key);
        }

        return result;
    }

    /**
     * This will add a mapping.
     *
     * @param src  The src to the mapping.
     * @param dest The dest to the mapping.
     * @throws IOException if the src is invalid.
     */
    public void addMapping(byte[] src, String dest) throws IOException {<FILL_FUNCTION_BODY>}


    /**
     * This will add a codespace range.
     *
     * @param range A single codespace range.
     */
    public void addCodespaceRange(CodespaceRange range) {
        codeSpaceRanges.add(range);
    }

    /**
     * Getter for property codeSpaceRanges.
     *
     * @return Value of property codeSpaceRanges.
     */
    public List getCodeSpaceRanges() {
        return codeSpaceRanges;
    }

}

        if (src.length == 1) {
            singleByteMappings.put(src[0] & 0xff, dest);
        } else if (src.length == 2) {
            int intSrc = src[0] & 0xFF;
            intSrc <<= 8;
            intSrc |= (src[1] & 0xFF);
            doubleByteMappings.put(intSrc, dest);
        } else {
            throw new IOException(
                    MessageLocalization.getComposedMessage("mapping.code.should.be.1.or.two.bytes.and.not.1",
                            src.length));
        }
    
<no_super_class>