/// <summary>Decodes an SMS-DELIVER message</summary>
internal SmsDeliverMessage(string pdu, MessageLocation messageLocation)
{
this.Pdu = pdu;
this.MessageLocation.Add(messageLocation);
int pduOffset = 0;
#region Short Message Service Center
// length of the smsc information
byte smscLength = byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
if (smscLength > 0)
{
// type of address
Convert.FromTypeOfAddress(byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber), out SMSCAddress.TypeOfAddress, out SMSCAddress.NumberingPlan);
pduOffset += 2;
// message center address
SMSCAddress.PhoneNumber += Convert.FromDecimalSemi(pdu.Substring(pduOffset, smscLength * 2 - 2));
pduOffset += smscLength * 2 - 2;
}
#endregion
#region First octet (message type & header info bit)
// first octet (TP-MTI must be set to SMS-DELIVER)
byte firstOctet = byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber);
if (Convert.TestBit(firstOctet, 1) || Convert.TestBit(firstOctet, 0))
{
throw new DecodeException("Only SMS-DELIVER messages can be decoded!");
}
// TP-UDH
bool hasMessageHeader = false;
if (Convert.TestBit(firstOctet, 6))
{
hasMessageHeader = true;
}
pduOffset += 2;
#endregion
#region Sender Address
// length of the sender address
byte senderLength = byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
// type of address
Convert.FromTypeOfAddress(byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber), out SenderAddress.TypeOfAddress, out SenderAddress.NumberingPlan);
pduOffset += 2;
// sender address
if (SenderAddress.TypeOfAddress == TypeOfAddress.Alphanumeric)
{
SenderAddress.PhoneNumber += Convert.FromSeptets(pdu.Substring(pduOffset, senderLength + (senderLength % 2 == 1 ? 1 : 0)));
}
else
{
SenderAddress.PhoneNumber += Convert.FromDecimalSemi(pdu.Substring(pduOffset, senderLength + (senderLength % 2 == 1 ? 1 : 0)));
}
pduOffset += senderLength + (senderLength % 2 == 1 ? 1 : 0);
#endregion
#region Metadata (compression, alphabet, class, encoding)
// TP-PID: protocol id
byte protocolId = byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
// TP-DCS: data coding scheme
bool messageCompressed = false;
int messageAlphabet = 0;
int messageClass = -1;
byte messageEncoding = byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
if (!Convert.TestBit(messageEncoding, 7) && !Convert.TestBit(messageEncoding, 6)) // general data
{
messageCompressed = (Convert.TestBit(messageEncoding, 5));
if (Convert.TestBit(messageEncoding, 4))
{
if (!Convert.TestBit(messageEncoding, 1) && !Convert.TestBit(messageEncoding, 0))
{
messageClass = 0; // class 0
}
else if (!Convert.TestBit(messageEncoding, 1) && Convert.TestBit(messageEncoding, 0))
{
messageClass = 1; // class 1 (me specific)
}
else if (Convert.TestBit(messageEncoding, 1) && !Convert.TestBit(messageEncoding, 0))
{
messageClass = 2; // class 2 (sim specific)
}
else if (Convert.TestBit(messageEncoding, 1) && Convert.TestBit(messageEncoding, 0))
{
messageClass = 3; // class 3 (te specific)
}
}
if (!Convert.TestBit(messageEncoding, 3) && !Convert.TestBit(messageEncoding, 2))
{
messageAlphabet = 0; // default alphabet
}
else if (!Convert.TestBit(messageEncoding, 3) && Convert.TestBit(messageEncoding, 2))
{
messageAlphabet = 1; // 8 bit data
}
else if (Convert.TestBit(messageEncoding, 3) && !Convert.TestBit(messageEncoding, 2))
{
messageAlphabet = 2; // ucs2 (16 bit)
}
else if (Convert.TestBit(messageEncoding, 3) && Convert.TestBit(messageEncoding, 2))
{
messageAlphabet = 0; // reserved (default alphabet)
}
}
else if (Convert.TestBit(messageEncoding, 7) && Convert.TestBit(messageEncoding, 6))
{
if (Convert.TestBit(messageEncoding, 5) && Convert.TestBit(messageEncoding, 4)) // data coding/message class
{
if (!Convert.TestBit(messageEncoding, 2))
{
messageAlphabet = 0; // default alphabet
}
else
{
messageAlphabet = 1; // 8 bit data
}
if (!Convert.TestBit(messageEncoding, 1) && !Convert.TestBit(messageEncoding, 0))
{
messageClass = 0;
}
else if (!Convert.TestBit(messageEncoding, 1) && Convert.TestBit(messageEncoding, 0))
{
messageClass = 1;
}
else if (Convert.TestBit(messageEncoding, 1) && !Convert.TestBit(messageEncoding, 0))
{
messageClass = 2;
}
else if (Convert.TestBit(messageEncoding, 1) && Convert.TestBit(messageEncoding, 0))
{
messageClass = 3;
}
}
else // message waiting indication group
{
if (Convert.TestBit(messageEncoding, 5) && !Convert.TestBit(messageEncoding, 4))
{
messageAlphabet = 2;
}
}
}
#endregion
#region Timestamp (adjusted to computers local time)
// TP-SCTS: service center time stamp
string messageTimestamp = Convert.FromDecimalSemi(pdu.Substring(pduOffset, 14));
pduOffset += 14;
int year = byte.Parse(messageTimestamp.Substring(0, 2));
if ((year >= 79) && (year <= 99))
{
year += 1900;
}
else
{
year += 2000;
}
DateReceived = new DateTime(year, byte.Parse(messageTimestamp.Substring(2, 2)), byte.Parse(messageTimestamp.Substring(4, 2)), byte.Parse(messageTimestamp.Substring(6, 2)), byte.Parse(messageTimestamp.Substring(8, 2)), byte.Parse(messageTimestamp.Substring(10, 2)));
// calculate offset adjustments we need to do to get localtime
int computerGmtOffset = (int)TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now).TotalMinutes; // local GMT offset
string messageGmtOffset = messageTimestamp.Substring(12, 2);
int messageGmtOffsetNum = 0;
byte b = byte.Parse("" + messageGmtOffset[1]); // already swapped
if ((b & 0xFF) == 0xFF)
{
// negative
b &= 0xFE;
messageGmtOffset = "" + messageGmtOffset[0] + (char)b;
messageGmtOffsetNum = -byte.Parse(messageGmtOffset);
}
else
{
// positive
messageGmtOffsetNum = byte.Parse(messageGmtOffset);
}
messageGmtOffsetNum *= 15; // message GMT offset
this.DateReceived = this.DateReceived.AddMinutes(computerGmtOffset - messageGmtOffsetNum);
#endregion
#region Message length, encoded message, and header info
// TP-UDL: user data length
int messageLength = byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
string messageTPUD;
if (messageAlphabet == 0)
{
messageTPUD = pdu.Substring(pduOffset, (int)Math.Ceiling(messageLength * (7.0 / 8.0)) * 2);
}
else
{
messageTPUD = pdu.Substring(pduOffset, messageLength * 2);
}
// TP-UD: user data
pduOffset = 0;
int headerLength = 0;
if (hasMessageHeader)
{
// TP-UDHL (header length)
headerLength = byte.Parse(messageTPUD.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
// for each information element
int headerLengthRemaining = headerLength * 2;
int headerOffset = pduOffset;
while (headerLengthRemaining > 0)
{
byte ieElement = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
int ieLength = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
if ((ieElement == 0) && (ieLength == 3))
{
// concatenated short message
HasMoreParts = true;
PartGroupId = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
PartCount = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
PartIndex = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
}
else
{
headerOffset += ieLength * 2;
headerLengthRemaining -= ieLength * 2;
}
}
pduOffset = headerLength * 2 + 2;
}
#endregion
#region Message decoding
if (messageAlphabet == 0)
{
Text = Convert.FromSeptets(messageTPUD);
// cut sms
if (Text.Length > messageLength)
{
Text = Text.Substring(0, messageLength);
}
// remove header
if (hasMessageHeader)
{
headerLength++;
Text = Text.Substring((int)Math.Ceiling(headerLength / 7.0) * 7);
}
}
else
{
Text = Convert.FromOctets(messageTPUD.Substring(pduOffset, messageTPUD.Length - pduOffset));
}
#endregion
}
/// <summary>Decodes an SMS-DELIVER message</summary>
internal SmsDeliverMessage(string pdu, MessageLocation messageLocation) {
this.Pdu = pdu;
this.MessageLocation.Add(messageLocation);
int pduOffset = 0;
#region Short Message Service Center
// length of the smsc information
byte smscLength = byte.Parse(pdu.Substring(pduOffset,2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
if (smscLength > 0) {
// type of address
Convert.FromTypeOfAddress(byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber), out SMSCAddress.TypeOfAddress, out SMSCAddress.NumberingPlan);
pduOffset += 2;
// message center address
SMSCAddress.PhoneNumber += Convert.FromDecimalSemi(pdu.Substring(pduOffset, smscLength * 2 - 2));
pduOffset += smscLength*2-2;
}
#endregion
#region First octet (message type & header info bit)
// first octet (TP-MTI must be set to SMS-DELIVER)
byte firstOctet = byte.Parse(pdu.Substring(pduOffset,2), System.Globalization.NumberStyles.HexNumber);
if (Convert.TestBit(firstOctet, 1) || Convert.TestBit(firstOctet, 0)) {
throw new DecodeException("Only SMS-DELIVER messages can be decoded!");
}
// TP-UDH
bool hasMessageHeader = false;
if (Convert.TestBit(firstOctet, 6)) {
hasMessageHeader = true;
}
pduOffset += 2;
#endregion
#region Sender Address
// length of the sender address
byte senderLength = byte.Parse(pdu.Substring(pduOffset,2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
// type of address
Convert.FromTypeOfAddress(byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber), out SenderAddress.TypeOfAddress, out SenderAddress.NumberingPlan);
pduOffset += 2;
// sender address
if (SenderAddress.TypeOfAddress == TypeOfAddress.Alphanumeric) {
SenderAddress.PhoneNumber += Convert.FromSeptets(pdu.Substring(pduOffset, senderLength + (senderLength % 2 == 1 ? 1 : 0)));
} else {
SenderAddress.PhoneNumber += Convert.FromDecimalSemi(pdu.Substring(pduOffset, senderLength + (senderLength % 2 == 1 ? 1 : 0)));
}
pduOffset += senderLength+(senderLength % 2 == 1 ? 1 : 0);
#endregion
#region Metadata (compression, alphabet, class, encoding)
// TP-PID: protocol id
byte protocolId = byte.Parse(pdu.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
// TP-DCS: data coding scheme
bool messageCompressed = false;
int messageAlphabet = 0;
int messageClass = -1;
byte messageEncoding = byte.Parse(pdu.Substring(pduOffset, 2),System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
if (!Convert.TestBit(messageEncoding, 7) && !Convert.TestBit(messageEncoding, 6)) { // general data
messageCompressed = (Convert.TestBit(messageEncoding, 5));
if (Convert.TestBit(messageEncoding, 4)) {
if (!Convert.TestBit(messageEncoding, 1) && !Convert.TestBit(messageEncoding, 0)) {
messageClass = 0; // class 0
} else if (!Convert.TestBit(messageEncoding, 1) && Convert.TestBit(messageEncoding, 0)) {
messageClass = 1; // class 1 (me specific)
} else if (Convert.TestBit(messageEncoding, 1) && !Convert.TestBit(messageEncoding, 0)) {
messageClass = 2; // class 2 (sim specific)
} else if (Convert.TestBit(messageEncoding, 1) && Convert.TestBit(messageEncoding, 0)) {
messageClass = 3; // class 3 (te specific)
}
}
if (!Convert.TestBit(messageEncoding, 3) && !Convert.TestBit(messageEncoding, 2)) {
messageAlphabet = 0; // default alphabet
} else if (!Convert.TestBit(messageEncoding, 3) && Convert.TestBit(messageEncoding, 2)) {
messageAlphabet = 1; // 8 bit data
} else if (Convert.TestBit(messageEncoding, 3) && !Convert.TestBit(messageEncoding, 2)) {
messageAlphabet = 2; // ucs2 (16 bit)
} else if (Convert.TestBit(messageEncoding, 3) && Convert.TestBit(messageEncoding, 2)) {
messageAlphabet = 0; // reserved (default alphabet)
}
} else if (Convert.TestBit(messageEncoding, 7) && Convert.TestBit(messageEncoding, 6)) {
if (Convert.TestBit(messageEncoding, 5) && Convert.TestBit(messageEncoding, 4)) { // data coding/message class
if (!Convert.TestBit(messageEncoding, 2)) {
messageAlphabet = 0; // default alphabet
} else {
messageAlphabet = 1; // 8 bit data
}
if (!Convert.TestBit(messageEncoding, 1) && !Convert.TestBit(messageEncoding, 0)) {
messageClass = 0;
} else if (!Convert.TestBit(messageEncoding, 1) && Convert.TestBit(messageEncoding, 0)) {
messageClass = 1;
} else if (Convert.TestBit(messageEncoding, 1) && !Convert.TestBit(messageEncoding, 0)) {
messageClass = 2;
} else if (Convert.TestBit(messageEncoding, 1) && Convert.TestBit(messageEncoding, 0)) {
messageClass = 3;
}
} else { // message waiting indication group
if (Convert.TestBit(messageEncoding, 5) && !Convert.TestBit(messageEncoding, 4)) {
messageAlphabet = 2;
}
}
}
#endregion
#region Timestamp (adjusted to computers local time)
// TP-SCTS: service center time stamp
string messageTimestamp = Convert.FromDecimalSemi(pdu.Substring(pduOffset, 14));
pduOffset += 14;
int year = byte.Parse(messageTimestamp.Substring(0, 2));
if ((year >= 79) && (year <= 99)) {
year += 1900;
} else {
year += 2000;
}
DateReceived = new DateTime(year, byte.Parse(messageTimestamp.Substring(2,2)), byte.Parse(messageTimestamp.Substring(4,2)), byte.Parse(messageTimestamp.Substring(6,2)), byte.Parse(messageTimestamp.Substring(8,2)), byte.Parse(messageTimestamp.Substring(10,2)));
// calculate offset adjustments we need to do to get localtime
int computerGmtOffset = (int)TimeZone.CurrentTimeZone.GetUtcOffset(DateTime.Now).TotalMinutes; // local GMT offset
string messageGmtOffset = messageTimestamp.Substring(12,2);
int messageGmtOffsetNum = 0;
byte b = byte.Parse(""+messageGmtOffset[1]); // already swapped
if ((b & 0xFF) == 0xFF) {
// negative
b &= 0xFE;
messageGmtOffset = "" + messageGmtOffset[0] + (char)b;
messageGmtOffsetNum = -byte.Parse(messageGmtOffset);
} else {
// positive
messageGmtOffsetNum = byte.Parse(messageGmtOffset);
}
messageGmtOffsetNum *= 15; // message GMT offset
this.DateReceived = this.DateReceived.AddMinutes(computerGmtOffset-messageGmtOffsetNum);
#endregion
#region Message length, encoded message, and header info
// TP-UDL: user data length
int messageLength = byte.Parse(pdu.Substring(pduOffset,2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
string messageTPUD;
if (messageAlphabet == 0) {
messageTPUD = pdu.Substring(pduOffset, (int)Math.Ceiling(messageLength*(7.0/8.0))*2);
} else {
messageTPUD = pdu.Substring(pduOffset, messageLength*2);
}
// TP-UD: user data
pduOffset = 0;
int headerLength = 0;
if (hasMessageHeader) {
// TP-UDHL (header length)
headerLength = byte.Parse(messageTPUD.Substring(pduOffset, 2), System.Globalization.NumberStyles.HexNumber);
pduOffset += 2;
// for each information element
int headerLengthRemaining = headerLength*2;
int headerOffset = pduOffset;
while (headerLengthRemaining > 0) {
byte ieElement = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
int ieLength = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
if ((ieElement == 0) && (ieLength == 3)) {
// concatenated short message
HasMoreParts = true;
PartGroupId = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
PartCount = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
PartIndex = byte.Parse(messageTPUD.Substring(headerOffset, 2), System.Globalization.NumberStyles.HexNumber);
headerOffset += 2;
headerLengthRemaining -= 2;
} else {
headerOffset += ieLength*2;
headerLengthRemaining -= ieLength*2;
}
}
pduOffset = headerLength*2+2;
}
#endregion
#region Message decoding
if (messageAlphabet == 0) {
Text = Convert.FromSeptets(messageTPUD);
// cut sms
if (Text.Length > messageLength) {
Text = Text.Substring(0, messageLength);
}
// remove header
if (hasMessageHeader) {
headerLength++;
Text = Text.Substring((int)Math.Ceiling(headerLength/7.0)*7);
}
} else {
Text = Convert.FromOctets(messageTPUD.Substring(pduOffset, messageTPUD.Length - pduOffset));
}
#endregion
}
