Method _compress

src/main/java/com/volmit/adapt/util/LZString.java:134–347

(String uncompressedStr, int bitsPerChar, CompressFunctionWrapper getCharFromInt)

    }

    private static String _compress(String uncompressedStr, int bitsPerChar, CompressFunctionWrapper getCharFromInt) {
        if (uncompressedStr == null) return "";
        int i, value;
        Map<String, Integer> context_dictionary = new HashMap<String, Integer>();
        Set<String> context_dictionaryToCreate = new HashSet<String>();
        String context_c = "";
        String context_wc = "";
        String context_w = "";
        int context_enlargeIn = 2; // Compensate for the first entry which should not count
        int context_dictSize = 3;
        int context_numBits = 2;
        StringBuilder context_data = new StringBuilder(uncompressedStr.length() / 3);
        int context_data_val = 0;
        int context_data_position = 0;
        int ii;

        for (ii = 0; ii < uncompressedStr.length(); ii += 1) {
            context_c = String.valueOf(uncompressedStr.charAt(ii));
            if (!context_dictionary.containsKey(context_c)) {
                context_dictionary.put(context_c, context_dictSize++);
                context_dictionaryToCreate.add(context_c);
            }

            context_wc = context_w + context_c;
            if (context_dictionary.containsKey(context_wc)) {
                context_w = context_wc;
            } else {
                if (context_dictionaryToCreate.contains(context_w)) {
                    if (context_w.charAt(0) < 256) {
                        for (i = 0; i < context_numBits; i++) {
                            context_data_val = (context_data_val << 1);
                            if (context_data_position == bitsPerChar - 1) {
                                context_data_position = 0;
                                context_data.append(getCharFromInt.doFunc(context_data_val));
                                context_data_val = 0;
                            } else {
                                context_data_position++;
                            }
                        }
                        value = context_w.charAt(0);
                        for (i = 0; i < 8; i++) {
                            context_data_val = (context_data_val << 1) | (value & 1);
                            if (context_data_position == bitsPerChar - 1) {
                                context_data_position = 0;
                                context_data.append(getCharFromInt.doFunc(context_data_val));
                                context_data_val = 0;
                            } else {
                                context_data_position++;
                            }
                            value = value >> 1;
                        }
                    } else {
                        value = 1;
                        for (i = 0; i < context_numBits; i++) {
                            context_data_val = (context_data_val << 1) | value;
                            if (context_data_position == bitsPerChar - 1) {
                                context_data_position = 0;
                                context_data.append(getCharFromInt.doFunc(context_data_val));