/// <summary>
/// Calculates the number of bytes that must be present in the user data portion of the PDU.
/// </summary>
/// <param name="dataLength">The user data length specified in the PDU.</param>
/// <param name="dataCodingScheme">The data coding scheme specified in the PDU.</param>
/// <returns>The number of bytes (octets) that must be present, or, if decoding the user data, the number
/// of remaining bytes that must be read.</returns>
/// <remarks>The <b>dataLength</b> and <b>dataCodingScheme</b> parameters are used to
/// calculate the number of bytes that must be present in the user data.</remarks>
internal static int GetRemainingUserDataBytes(byte dataLength, byte dataCodingScheme)
{
int num;
DataCodingScheme dataCodingScheme1 = DataCodingScheme.Decode(dataCodingScheme);
byte alphabet = dataCodingScheme1.Alphabet;
switch (alphabet)
{
case 0:
{
num = (int)Math.Ceiling((double)dataLength * 7 / 8);
break;
}
case 1:
case 2:
{
num = dataLength;
break;
}
default:
{
num = (int)Math.Ceiling((double)dataLength * 7 / 8);
break;
}
}
return(num);
}
/// <summary>
/// Adds a user data header to an existing user data.
/// </summary>
/// <param name="header">The user data header to add.</param>
/// <exception cref="T:System.InvalidOperationException">There is already a user data header present in this message.</exception>
/// <exception cref="T:System.ArgumentException">The resulting total of user data header and existing user data exceeds the allowed
/// maximum data length.</exception>
/// <remarks>
/// <para>The user data must already be set before adding a user data header.</para>
/// <para>Adding a user data header reduces the available space for the remaining user data. If the resulting total of
/// user data header and existing user data exceeds allowed maximum data length, an exception is raised.</para>
/// </remarks>
public void AddUserDataHeader(byte[] header)
{
int num;
if (this.UserDataHeaderPresent)
{
throw new InvalidOperationException("There is already a user data header present in this message.");
}
else
{
int length = (int)header.Length;
byte num1 = (byte)((double)length * 8 / 7);
DataCodingScheme dataCodingScheme = GsmComm.PduConverter.DataCodingScheme.Decode(this.DCS);
if (dataCodingScheme.Alphabet != 0)
{
if (dataCodingScheme.Alphabet == 1 || dataCodingScheme.Alphabet == 2)
{
num = length + this.userDataLength;
}
else
{
num = num1 + this.userDataLength;
}
}
else
{
num = num1 + this.userDataLength;
}
byte[] numArray = new byte[(int)header.Length + (int)this.userData.Length];
header.CopyTo(numArray, 0);
this.userData.CopyTo(numArray, (int)header.Length);
this.SetUserData(numArray, (byte)num);
this.UserDataHeaderPresent = true;
return;
}
}
/// <summary>
/// Decodes text from user data in the specified data coding scheme.
/// </summary>
/// <param name="userData">The user data to decode. Must contain text according to the specified data coding scheme.</param>
/// <param name="dataCodingScheme">The data coding scheme specified in the PDU.</param>
/// <returns>The decoded user data.</returns>
public static string DecodeText(byte[] userData, byte dataCodingScheme)
{
string str;
byte alphabet = DataCodingScheme.Decode(dataCodingScheme).Alphabet;
byte num = alphabet;
switch (num)
{
case 0:
{
str = PduParts.Decode7BitText(userData);
break;
}
case 1:
{
//Label0:
str = PduParts.Decode7BitText(userData);
break;
}
case 2:
{
str = PduParts.DecodeUcs2Text(userData);
break;
}
default:
{
//goto Label0;
str = PduParts.Decode7BitText(userData);
break;
}
}
return(str);
}
