private static String readUTF()

in indexer-core/src/main/java/org/apache/maven/index/updater/IndexDataReader.java [387:470]
69 lines of code
21 McCabe index (conditional complexity)

    private static String readUTF(DataInput in) throws IOException {
        int utflen = in.readInt();

        byte[] bytearr;
        char[] chararr;

        try {
            bytearr = new byte[utflen];
            chararr = new char[utflen];
        } catch (OutOfMemoryError e) {
            throw new IOException(
                    "Index data content is inappropriate (is junk?), leads to OutOfMemoryError!"
                            + " See MINDEXER-28 for more information!",
                    e);
        }

        int c, char2, char3;
        int count = 0;
        int chararrCount = 0;

        in.readFully(bytearr, 0, utflen);

        while (count < utflen) {
            c = bytearr[count] & 0xff;
            if (c > 127) {
                break;
            }
            count++;
            chararr[chararrCount++] = (char) c;
        }

        while (count < utflen) {
            c = bytearr[count] & 0xff;
            switch (c >> 4) {
                case 0:
                case 1:
                case 2:
                case 3:
                case 4:
                case 5:
                case 6:
                case 7:
                    /* 0xxxxxxx */
                    count++;
                    chararr[chararrCount++] = (char) c;
                    break;

                case 12:
                case 13:
                    /* 110x xxxx 10xx xxxx */
                    count += 2;
                    if (count > utflen) {
                        throw new UTFDataFormatException("malformed input: partial character at end");
                    }
                    char2 = bytearr[count - 1];
                    if ((char2 & 0xC0) != 0x80) {
                        throw new UTFDataFormatException("malformed input around byte " + count);
                    }
                    chararr[chararrCount++] = (char) (((c & 0x1F) << 6) | (char2 & 0x3F));
                    break;

                case 14:
                    /* 1110 xxxx 10xx xxxx 10xx xxxx */
                    count += 3;
                    if (count > utflen) {
                        throw new UTFDataFormatException("malformed input: partial character at end");
                    }
                    char2 = bytearr[count - 2];
                    char3 = bytearr[count - 1];
                    if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80)) {
                        throw new UTFDataFormatException("malformed input around byte " + (count - 1));
                    }
                    chararr[chararrCount++] = (char) (((c & 0x0F) << 12) | ((char2 & 0x3F) << 6) | ((char3 & 0x3F)));
                    break;

                default:
                    /* 10xx xxxx, 1111 xxxx */
                    throw new UTFDataFormatException("malformed input around byte " + count);
            }
        }

        // The number of chars produced may be less than utflen
        return new String(chararr, 0, chararrCount);
    }