public static String readUTF8()

in openwire-core/src/main/java/org/apache/activemq/openwire/utils/OpenWireMarshallingSupport.java [347:410]
57 lines of code
19 McCabe index (conditional complexity)

    public static String readUTF8(DataInput dataIn) throws IOException {
        int utflen = dataIn.readInt(); // TODO diff: Sun code
        if (utflen > -1) {
            StringBuffer str = new StringBuffer(utflen);
            byte bytearr[] = new byte[utflen];
            int c;
            int char2;
            int char3;
            int count = 0;

            dataIn.readFully(bytearr, 0, utflen);

            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++;
                        str.append((char) c);
                        break;
                    case 12:
                    case 13:
                        /* 110x xxxx 10xx xxxx */
                        count += 2;
                        if (count > utflen) {
                            throw new UTFDataFormatException();
                        }
                        char2 = bytearr[count - 1];
                        if ((char2 & 0xC0) != 0x80) {
                            throw new UTFDataFormatException();
                        }
                        str.append((char) (((c & 0x1F) << 6) | (char2 & 0x3F)));
                        break;
                    case 14:
                        /* 1110 xxxx 10xx xxxx 10xx xxxx */
                        count += 3;
                        if (count > utflen) {
                            throw new UTFDataFormatException();
                        }
                        char2 = bytearr[count - 2]; // TODO diff: Sun code
                        char3 = bytearr[count - 1]; // TODO diff: Sun code
                        if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80)) {
                            throw new UTFDataFormatException();
                        }
                        str.append((char) (((c & 0x0F) << 12) | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0)));
                        break;
                    default:
                        /* 10xx xxxx, 1111 xxxx */
                        throw new UTFDataFormatException();
                }
            }
            // The number of chars produced may be less than utflen
            return new String(str);
        } else {
            return null;
        }
    }