rfc2047_to_utf8
ssize_t rfc2047_to_utf8(char **buffer, size_t *bufLen, size_t strLen = 0);
length = rfc2047_to_utf8(&buffer, &length, length);
length = rfc2047_to_utf8(&buffer, &bufferSize, length);
size_t length = rfc2047_to_utf8(&buffer, &bufferSize, bufferSize);
size_t length = rfc2047_to_utf8(&start, &sourceLength,