public static int maybeQuote2 (int version, StringBuffer buf, String value, String literals, boolean allowVersionSwitch) {
if (value==null || value.length()==0) {
buf.append("\"\"");
}else if (containsCTL(value,version))
throw new IllegalArgumentException("Control character in cookie value, consider BASE64 encoding your value");
else if (alreadyQuoted(value)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value,1,value.length()-1));
buf.append('"');
} else if (allowVersionSwitch && (!STRICT_SERVLET_COMPLIANCE) && version==0 && !isToken2(value, literals)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value,0,value.length()));
buf.append('"');
version = 1;
} else if (version==0 && !isToken(value,literals)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value,0,value.length()));
buf.append('"');
} else if (version==1 && !isToken2(value,literals)) {
buf.append('"');
buf.append(escapeDoubleQuotes(value,0,value.length()));
buf.append('"');
}else {
buf.append(value);
}
return version;
}