/**
* Some dial strings in GSM are defined to do non-call setup things, such as modify or query
* supplementary service settings (eg, call forwarding). These are generally referred to as "MMI
* codes". We look to see if the dial string contains a valid MMI code (potentially with a dial
* string at the end as well) and return info here.
*
* <p>If the dial string contains no MMI code, we return an instance with only "dialingNumber" set
*
* <p>Please see flow chart in TS 22.030 6.5.3.2
*/
static GsmMmiCode newFromDialString(String dialString, GSMPhone phone, UiccCardApplication app) {
Matcher m;
GsmMmiCode ret = null;
if (SystemProperties.getBoolean("ro.config.multimode_cdma", false)) {
m = sPatternSuppServiceGlobalDev.matcher(dialString);
if (m.matches()) {
ret = new GsmMmiCode(phone, app);
ret.action = makeEmptyNull(m.group(MATCH_GROUP_ACTION));
String DialCode = makeEmptyNull(m.group(MATCH_GROUP_SERVICE_CODE));
if (DialCode.equals(SC_GLOBALDEV_VM)) {
ret.sc = SC_GLOBALDEV_VM;
ret.dialingNumber = "+1" + phone.getMdn();
return ret;
} else if (DialCode.equals(SC_GLOBALDEV_CS)) {
ret.sc = SC_GLOBALDEV_CS;
ret.dialingNumber = GLOBALDEV_CS;
return ret;
} else if (DialCode.length() >= 3 && DialCode.startsWith(SC_GLOBALDEV_CLIR_INVK)) {
// Dial "#31#PhoneNum" to invoke CLIR temporarily
dialString = ACTION_DEACTIVATE + SC_CLIR + ACTION_DEACTIVATE + DialCode.substring(2);
} else if (DialCode.length() >= 3 && DialCode.startsWith(SC_GLOBALDEV_CLIR_SUPP)) {
// Dial "*31#PhoneNum" to suppress CLIR temporarily
dialString = ACTION_ACTIVATE + SC_CLIR + ACTION_DEACTIVATE + DialCode.substring(2);
}
}
}
m = sPatternSuppService.matcher(dialString);
// Is this formatted like a standard supplementary service code?
if (m.matches()) {
ret = new GsmMmiCode(phone, app);
ret.poundString = makeEmptyNull(m.group(MATCH_GROUP_POUND_STRING));
ret.action = makeEmptyNull(m.group(MATCH_GROUP_ACTION));
ret.sc = makeEmptyNull(m.group(MATCH_GROUP_SERVICE_CODE));
ret.sia = makeEmptyNull(m.group(MATCH_GROUP_SIA));
ret.sib = makeEmptyNull(m.group(MATCH_GROUP_SIB));
ret.sic = makeEmptyNull(m.group(MATCH_GROUP_SIC));
ret.pwd = makeEmptyNull(m.group(MATCH_GROUP_PWD_CONFIRM));
ret.dialingNumber = makeEmptyNull(m.group(MATCH_GROUP_DIALING_NUMBER));
} else if (dialString.endsWith("#")) {
// TS 22.030 sec 6.5.3.2
// "Entry of any characters defined in the 3GPP TS 23.038 [8] Default Alphabet
// (up to the maximum defined in 3GPP TS 24.080 [10]), followed by #SEND".
ret = new GsmMmiCode(phone, app);
ret.poundString = dialString;
} else if (isTwoDigitShortCode(phone.getContext(), dialString)) {
// Is a country-specific exception to short codes as defined in TS 22.030, 6.5.3.2
ret = null;
} else if (isShortCode(dialString, phone)) {
// this may be a short code, as defined in TS 22.030, 6.5.3.2
ret = new GsmMmiCode(phone, app);
ret.dialingNumber = dialString;
}
return ret;
}
/**
* Helper function for newFromDialString. Returns true if dialString appears to be a short code
* AND conditions are correct for it to be treated as such.
*/
private static boolean isShortCode(String dialString, GSMPhone phone) {
// check for any Adapt change requirements.
boolean shortCodeExclusionFlag = false;
if (SystemProperties.getBoolean("persist.cust.tel.adapt", false)) {
if (dialString.length() == 2) {
Log.i(LOG_TAG, "Adapt, Number needs to be checked for short code exclusion list");
shortCodeExclusionFlag = isExcludedShortCode(dialString);
}
}
// Refer to TS 22.030 Figure 3.5.3.2:
// A 1 or 2 digit "short code" is treated as USSD if it is entered while on a call or
// does not satisfy the condition (exactly 2 digits && starts with '1').
return ((dialString != null && dialString.length() <= 2)
&& !PhoneNumberUtils.isEmergencyNumber(dialString)
&& (phone.isInCall()
|| !((dialString.length() == 2 && dialString.charAt(0) == '1')
|| shortCodeExclusionFlag
/*
* While contrary to TS 22.030, there is strong precedence for
* treating "0" and "00" as call setup strings.
*/
|| dialString.equals("0")
|| dialString.equals("00"))));
}