protected static String getXMLDeclarationEncoding()

in batik-xml/src/main/java/org/apache/batik/xml/XMLUtilities.java [266:393]
108 lines of code
37 McCabe index (conditional complexity)

    protected static String getXMLDeclarationEncoding(Reader r, String e)
        throws IOException {
        int c;

        if ((c = r.read()) != 'l') {
            return e;
        }

        if (!isXMLSpace((char)(c = r.read()))) {
            return e;
        }

        while (isXMLSpace((char)(c = r.read()))) {
            //skip
        }

        if (c != 'v') {
            return e;
        }
        if ((c = r.read()) != 'e') {
            return e;
        }
        if ((c = r.read()) != 'r') {
            return e;
        }
        if ((c = r.read()) != 's') {
            return e;
        }
        if ((c = r.read()) != 'i') {
            return e;
        }
        if ((c = r.read()) != 'o') {
            return e;
        }
        if ((c = r.read()) != 'n') {
            return e;
        }

        c = r.read();
        while (isXMLSpace((char)c)) {
            c = r.read();
        }

        if (c != '=') {
            return e;
        }

        while (isXMLSpace((char)(c = r.read()))) {
            //skip
        }

        if (c != '"' && c != '\'') {
            return e;
        }
        char sc = (char)c;

        for (;;) {
            c = r.read();
            if (c == sc) {
                break;
            }
            if (!isXMLVersionCharacter((char)c)) {
                return e;
            }
        }

        if (!isXMLSpace((char)(c = r.read()))) {
            return e;
        }
        while (isXMLSpace((char)(c = r.read()))) {
            //skip
        }

        if (c != 'e') {
            return e;
        }
        if ((c = r.read()) != 'n') {
            return e;
        }
        if ((c = r.read()) != 'c') {
            return e;
        }
        if ((c = r.read()) != 'o') {
            return e;
        }
        if ((c = r.read()) != 'd') {
            return e;
        }
        if ((c = r.read()) != 'i') {
            return e;
        }
        if ((c = r.read()) != 'n') {
            return e;
        }
        if ((c = r.read()) != 'g') {
            return e;
        }

        c = r.read();
        while (isXMLSpace((char)c)) {
            c = r.read();
        }

        if (c != '=') {
            return e;
        }

        while (isXMLSpace((char)(c = r.read()))) {
            //skip
        }

        if (c != '"' && c != '\'') {
            return e;
        }
        sc = (char)c;

        StringBuffer enc = new StringBuffer();
        for (;;) {
            c = r.read();
            if (c == -1) {
                return e;
            }
            if (c == sc) {
                return encodingToJavaEncoding(enc.toString(), e);
            }
            enc.append((char)c);
        }
    }