serializer/src/main/java/org/apache/xml/serializer/utils/URI.java [1041:1087]:
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  public void setUserinfo(String p_userinfo) throws MalformedURIException
  {

    if (p_userinfo == null)
    {
      m_userinfo = null;
    }
    else
    {
      if (m_host == null)
      {
        throw new MalformedURIException(
          "Userinfo cannot be set when host is null!");
      }

      // userinfo can contain alphanumerics, mark characters, escaped
      // and ';',':','&','=','+','$',','
      int index = 0;
      int end = p_userinfo.length();
      char testChar = '\0';

      while (index < end)
      {
        testChar = p_userinfo.charAt(index);

        if (testChar == '%')
        {
          if (index + 2 >= end ||!isHex(p_userinfo.charAt(index + 1))
                  ||!isHex(p_userinfo.charAt(index + 2)))
          {
            throw new MalformedURIException(
              "Userinfo contains invalid escape sequence!");
          }
        }
        else if (!isUnreservedCharacter(testChar)
                 && USERINFO_CHARACTERS.indexOf(testChar) == -1)
        {
          throw new MalformedURIException(
            "Userinfo contains invalid character:" + testChar);
        }

        index++;
      }
    }

    m_userinfo = p_userinfo;
  }
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xalan/src/main/java/org/apache/xml/utils/URI.java [1061:1107]:
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  public void setUserinfo(String p_userinfo) throws MalformedURIException
  {

    if (p_userinfo == null)
    {
      m_userinfo = null;
    }
    else
    {
      if (m_host == null)
      {
        throw new MalformedURIException(
          "Userinfo cannot be set when host is null!");
      }

      // userinfo can contain alphanumerics, mark characters, escaped
      // and ';',':','&','=','+','$',','
      int index = 0;
      int end = p_userinfo.length();
      char testChar = '\0';

      while (index < end)
      {
        testChar = p_userinfo.charAt(index);

        if (testChar == '%')
        {
          if (index + 2 >= end ||!isHex(p_userinfo.charAt(index + 1))
                  ||!isHex(p_userinfo.charAt(index + 2)))
          {
            throw new MalformedURIException(
              "Userinfo contains invalid escape sequence!");
          }
        }
        else if (!isUnreservedCharacter(testChar)
                 && USERINFO_CHARACTERS.indexOf(testChar) == -1)
        {
          throw new MalformedURIException(
            "Userinfo contains invalid character:" + testChar);
        }

        index++;
      }
    }

    m_userinfo = p_userinfo;
  }
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