public int LengthS1ap = 0; //指示nas前面的s1ap的长度
/// <summary>
/// 该方法将输入的E-rab modify request信令编码中截取nas编码
/// </summary>
/// <param name="s1ap">s1ap信令编码</param>
/// <returns>nas信令编码</returns>
public byte[] nasIE(byte[] s1ap)
{
#region //变量声明
ushort tlength = 0; //s1ap信令的所有信元编码总长度
ushort slength = 0; //单个信元的编码长度
ushort listLength = 0;
ushort itemLength = 0;
ushort nasLength = 1;
ushort nasLength1 = 0;
ushort len1 = 0; //用于判定总长度所占字节的变量
ushort len2 = 0; //用于判定单个信元长度所占字节的变量
ushort len3 = 0;
ushort len4 = 0;
ushort id = 0;
byte Gbr_or = 0; //用来判定e-rab level qos parameter中是否有GBR（16byte）
List <byte> nas = new List <byte>();
byte[] nasShuzu = new byte[nasLength]; //用于接收nas的内容
#endregion
s1ap_name dir = new s1ap_name();
dir.s1ap_decode1(s1ap);//获取信令的direction
direction = (byte)dir.direction;
len1 = s1ap[3];//用于判断当前信元的长度
if (len1 >= 128)
{
tlength = (ushort)((s1ap[3] & 0x0f) * 256 + s1ap[4]);
}
else
{
tlength = s1ap[3];
}
if (tlength >= 128)//信令编码总长度大于128
{
#region
for (int i = 8; i < s1ap.Length;)
{
id = (ushort)(s1ap[i] * 256 + s1ap[i + 1]);
if (id == 30)
{
#region
len2 = s1ap[i + 3]; //用来判断list信元的长度
if (len2 >= 128) //list信元的长度大于128
{
#region
slength = (ushort)((s1ap[i + 3] & 0x0f) * 256 + s1ap[i + 4]);
listLength = 2; //该信元长度域占2字节
len3 = s1ap[i + 9]; //用来判断item信元的长度
if (len3 >= 128) //item的长度
{
#region
itemLength = (ushort)((s1ap[i + 9] & 0x0f) * 256 + s1ap[i + 10]);
Gbr_or = s1ap[i + 12];//该字节包含e-rab level qos parameter的标志位，若为80则，含有Gbr信元；若为00则不含GBR
if (Gbr_or == 0x00)
{
#region
len4 = s1ap[i + 15]; //用于判断nas长度
if (len4 >= 128) //nas长度
{
nasLength = (ushort)((s1ap[i + 15] & 0x0f) * 256 + s1ap[i + 16]);
nasLength1 = 2;//nas 长度域所占字节
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 17, b1, 0, nasLength);
LengthS1ap = i + 17;
nasShuzu = b1;
break;
}
else//nas长度
{
nasLength = len4;
nasLength1 = 1;
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 16, b1, 0, nasLength);
LengthS1ap = i + 16;
nasShuzu = b1;
break;
}
#endregion
}
else if (Gbr_or == 0x80)//该字节包含e-rab level qos parameter的标志位，若为80则，含有Gbr信元；若为00则不含GBR
{
#region
int bitrate1_len = ((s1ap[i + 15] & 0x38) >> 3) + 2;
int bitrate2_len = ((s1ap[i + 15 + bitrate1_len] & 0xe0) >> 5) + 2;
int bitrate3_len = ((s1ap[i + 15 + bitrate1_len + bitrate2_len] & 0xe0) >> 5) + 2;
int bitrate4_len = ((s1ap[i + 15 + bitrate1_len + bitrate2_len + bitrate3_len] & 0xe0) >> 5) + 2;
int bitrate_len = bitrate1_len + bitrate2_len + bitrate3_len + bitrate4_len;
len4 = s1ap[i + 15 + bitrate_len]; //用于判断nas长度，GBR占16字节
if (len4 >= 128) //nas长度
{
nasLength = (ushort)((s1ap[i + 15 + bitrate_len] & 0x0f) * 256 + s1ap[i + 16 + bitrate_len]);
nasLength1 = 2;//nas 长度域所占字节
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 17 + bitrate_len, b1, 0, nasLength);
LengthS1ap = i + 17 + bitrate_len;
nasShuzu = b1;
break;
}
else//nas长度
{
nasLength = len4;
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 16 + bitrate_len, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 16 + bitrate_len;
break;
}
#endregion
}
#endregion
}
else//item的长度小于128
{
#region
Gbr_or = s1ap[i + 11];
if (Gbr_or == 0x80)
{
int bitrate1_len = ((s1ap[i + 14] & 0x38) >> 3) + 2;
int bitrate2_len = ((s1ap[i + 14 + bitrate1_len] & 0xe0) >> 5) + 2;
int bitrate3_len = ((s1ap[i + 14 + bitrate1_len + bitrate2_len] & 0xe0) >> 5) + 2;
int bitrate4_len = ((s1ap[i + 14 + bitrate1_len + bitrate2_len + bitrate3_len] & 0xe0) >> 5) + 2;
int bitrate_len = bitrate1_len + bitrate2_len + bitrate3_len + bitrate4_len;
len4 = s1ap[i + 14 + bitrate_len];//用于判断nas长度，GBR占16字节
nasLength = s1ap[i + 14 + bitrate_len];
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 15 + bitrate_len, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 15 + bitrate_len;
break;
}
else if (Gbr_or == 0x00)
{
nasLength = s1ap[i + 14];
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 15, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 15;
break;
}
#endregion
}
#endregion
}
else//list的长度小于128
{
#region
Gbr_or = s1ap[i + 10];
if (Gbr_or == 0x80)
{
int bitrate1_len = ((s1ap[i + 13] & 0x38) >> 3) + 2;
int bitrate2_len = ((s1ap[i + 13 + bitrate1_len] & 0xe0) >> 5) + 2;
int bitrate3_len = ((s1ap[i + 13 + bitrate1_len + bitrate2_len] & 0xe0) >> 5) + 2;
int bitrate4_len = ((s1ap[i + 13 + bitrate1_len + bitrate2_len + bitrate3_len] & 0xe0) >> 5) + 2;
int bitrate_len = bitrate1_len + bitrate2_len + bitrate3_len + bitrate4_len;
nasLength = s1ap[i + 13 + bitrate_len];
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 14 + bitrate_len, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 14 + bitrate_len;
break;
}
else if (Gbr_or == 0x00)
{
nasLength = s1ap[i + 13];
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 14, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 14;
break;
}
#endregion
}
#endregion
}
else//id !=30
{
#region
slength = s1ap[i + 3];
if (slength < 128)
{
i = (ushort)(i + slength + 4);
}
else
{
slength = (ushort)((s1ap[i + 3] & 0x0f) * 256 + s1ap[i + 4]);
i = (ushort)(i + slength + 5);//当信元的编码长度超过128时，则长度域的编码为0x80yy（2个字节）,且yy才是实际的编码长度
}
#endregion
}
}
#endregion
}
else//tlength < 128
{
#region
for (int i = 7; i < s1ap.Length;)
{
id = (ushort)(s1ap[i] * 256 + s1ap[i + 1]);
slength = s1ap[i + 3];
if (id == 30)
{
#region
listLength = 1;//该信元长度域占1字节
Gbr_or = s1ap[i + 10];
if (Gbr_or == 0x80)
{
int bitrate1_len = ((s1ap[i + 13] & 0x38) >> 3) + 2;
int bitrate2_len = ((s1ap[i + 13 + bitrate1_len] & 0xe0) >> 5) + 2;
int bitrate3_len = ((s1ap[i + 13 + bitrate1_len + bitrate2_len] & 0xe0) >> 5) + 2;
int bitrate4_len = ((s1ap[i + 13 + bitrate1_len + bitrate2_len + bitrate3_len] & 0xe0) >> 5) + 2;
int bitrate_len = bitrate1_len + bitrate2_len + bitrate3_len + bitrate4_len;
nasLength = s1ap[i + 13 + bitrate_len];
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 14 + bitrate_len, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 14 + bitrate_len;
break;//找到该信元以后，解析之后直接跳出循环
}
else if (Gbr_or == 0x00)
{
nasLength = s1ap[i + 13];
byte[] b1 = new byte[nasLength];
Array.Copy(s1ap, i + 14, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 14;
break;//找到该信元以后，解析之后直接跳出循环
}
#endregion
}
if (id != 30)
{
i = (ushort)(i + slength + 4);
}
}
#endregion
}
return(nasShuzu);
}
public byte direction = 1; //E-rab setuo request的方向是
public byte[] setup_list(byte[] a)
{
ushort tlength = 0; //s1ap信令的所有信元编码总长度
ushort slength = 0; //单个信元的编码长度
ushort listLength = 0;
ushort itemLength = 0;
ushort itemLength1 = 0;
ushort nasLength = 1;
ushort nasLength1 = 0;
ushort len1 = 0; //用于判定总长度所占字节的变量
ushort len2 = 0; //用于判定单个信元长度所占字节的变量
ushort len3 = 0;
ushort len4 = 0;
ushort id = 0;
byte Gbr_or = 0;//用来判定e-rab level qos parameter中是否有GBR（16byte）
byte[] nasShuzu = new byte[nasLength];
s1ap_name dir = new s1ap_name();
dir.s1ap_decode1(a);//获取信令的direction
direction = (byte)dir.direction;
len1 = a[3];//用于判断当前信元的长度
if (len1 >= 128)
{
tlength = (ushort)((a[3] & 0x0f) * 256 + a[4]);
}
else
{
tlength = a[3];
}
if (tlength >= 128)//信令编码总长度大于128
{
for (int i = 8; i < a.Length;)
{
id = (ushort)(a[i] * 256 + a[i + 1]);
if (id == 16)
{
#region
len2 = a[i + 3]; //用来判断list信元的长度
if (len2 >= 128) //list的长度大于128
{
#region
slength = (ushort)((a[i + 3] & 0x0f) * 256 + a[i + 4]);
listLength = 2; //该信元长度域占2字节
len3 = a[i + 9]; //用来判断item信元的长度
if (len3 >= 128) //item的长度
{
#region
itemLength = (ushort)((a[i + 9] & 0x0f) * 256 + a[i + 10]);
Gbr_or = a[i + 12];//该字节包含e-rab level qos parameter的标志位，若为80则，含有Gbr信元；若为00则不含GBR
if (Gbr_or == 0x00)
{
#region
len4 = a[i + 25]; //用于判断nas长度
if (len4 >= 128) //nas长度
{
nasLength = (ushort)((a[i + 25] & 0x0f) * 256 + a[i + 26]);
nasLength1 = 2;//nas 长度域所占字节
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 27, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 27;
break;
}
else//nas长度
{
nasLength = len4;
nasLength1 = 1;
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 26, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 26;
break;
}
#endregion
}
else if (Gbr_or == 0x80)//该字节包含e-rab level qos parameter的标志位，若为80则，含有Gbr信元；若为00则不含GBR
{
#region
int bitrate1_len = ((a[i + 15] & 0x38) >> 3) + 2;
//byte bitrate2 = a[i + 15 + bitrate1_len];
int bitrate2_len = ((a[i + 15 + bitrate1_len] & 0xe0) >> 5) + 2;
//byte bitrate3 = a[i + 15 + bitrate1_len+bitrate2_len];
int bitrate3_len = ((a[i + 15 + bitrate1_len + bitrate2_len] & 0xe0) >> 5) + 2;
//byte bitrate4 = a[i + 15 + bitrate1_len + bitrate2_len + bitrate3_len];
int bitrate4_len = ((a[i + 15 + bitrate1_len + bitrate2_len + bitrate3_len] & 0xe0) >> 5) + 2;
int bitrate_len = bitrate1_len + bitrate2_len + bitrate3_len + bitrate4_len;
len4 = a[i + 15 + bitrate_len + 10]; //用于判断nas长度，GBR占16字节
if (len4 >= 128) //nas长度
{
nasLength = (ushort)((a[i + 15 + bitrate_len + 10] & 0x0f) * 256 + a[i + 15 + bitrate_len + 11]);
nasLength1 = 2;//nas 长度域所占字节
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 15 + bitrate_len + 12, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 15 + bitrate_len + 12;
break;
}
else//nas长度
{
nasLength = len4;
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 15 + bitrate_len + 11, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 15 + bitrate_len + 11;
break;
}
#endregion
}
#endregion
}
else//item的长度小于128
{
#region
Gbr_or = a[i + 11];
if (Gbr_or == 0x80)
{
int bitrate1_len = ((a[i + 14] & 0x38) >> 3) + 2;
int bitrate2_len = ((a[i + 14 + bitrate1_len] & 0xe0) >> 5) + 2;
int bitrate3_len = ((a[i + 14 + bitrate1_len + bitrate2_len] & 0xe0) >> 5) + 2;
int bitrate4_len = ((a[i + 14 + bitrate1_len + bitrate2_len + bitrate3_len] & 0xe0) >> 5) + 2;
int bitrate_len = bitrate1_len + bitrate2_len + bitrate3_len + bitrate4_len;
len4 = a[i + 14 + bitrate_len + 10];//用于判断nas长度，GBR占16字节
nasLength = a[i + 14 + bitrate_len + 10];
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 14 + bitrate_len + 11, b1, 0, nasLength);
LengthS1ap = i + 14 + bitrate_len + 11;
nasShuzu = b1;
break;
}
else if (Gbr_or == 0x00)
{
nasLength = a[i + 24];
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 25, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 25;
break;
}
#endregion
}
#endregion
}
else//list的长度小于128
{
#region
Gbr_or = a[i + 10];
if (Gbr_or == 0x80)
{
int bitrate1_len = ((a[i + 13] & 0x38) >> 3) + 2;
int bitrate2_len = ((a[i + 13 + bitrate1_len] & 0xe0) >> 5) + 2;
int bitrate3_len = ((a[i + 13 + bitrate1_len + bitrate2_len] & 0xe0) >> 5) + 2;
int bitrate4_len = ((a[i + 13 + bitrate1_len + bitrate2_len + bitrate3_len] & 0xe0) >> 5) + 2;
int bitrate_len = bitrate1_len + bitrate2_len + bitrate3_len + bitrate4_len;
nasLength = a[i + 13 + bitrate_len + 10];
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 13 + bitrate_len + 11, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 13 + bitrate_len + 11;
break;
}
else if (Gbr_or == 0x00)
{
nasLength = a[i + 23];
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 24, b1, 0, nasLength);
nasShuzu = b1;
LengthS1ap = i + 24;
break;
}
#endregion
}
#endregion
}
if (id != 16)
{
#region
slength = a[i + 3];
if (slength < 128)
{
i = (ushort)(i + slength + 4);
}
else
{
i = (ushort)(i + slength + 5);//当信元的编码长度超过128时，则长度域的编码为0x80yy（2个字节）,且yy才是实际的编码长度
}
#endregion
}
}
}
if (tlength < 128)
{
#region
for (int i = 7; i < a.Length;)
{
id = (ushort)(a[i] * 256 + a[i + 1]);
slength = a[i + 3];
if (id == 16)
{
#region
listLength = 1;//该信元长度域占1字节
Gbr_or = a[i + 10];
if (Gbr_or == 0x80)
{
int bitrate1_len = ((a[i + 13] & 0x38) >> 3) + 2;
int bitrate2_len = ((a[i + 13 + bitrate1_len] & 0xe0) >> 5) + 2;
int bitrate3_len = ((a[i + 13 + bitrate1_len + bitrate2_len] & 0xe0) >> 5) + 2;
int bitrate4_len = ((a[i + 13 + bitrate1_len + bitrate2_len + bitrate3_len] & 0xe0) >> 5) + 2;
int bitrate_len = bitrate1_len + bitrate2_len + bitrate3_len + bitrate4_len;
nasLength = a[i + 13 + bitrate_len + 10];
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 13 + bitrate_len + 11, b1, 0, nasLength);
LengthS1ap = i + 13 + bitrate_len + 11;
nasShuzu = b1;
break;//找到该信元以后，解析之后直接跳出循环
}
else if (Gbr_or == 0x00)
{
nasLength = a[i + 23];
byte[] b1 = new byte[nasLength];
Array.Copy(a, i + 24, b1, 0, nasLength);
LengthS1ap = i + 24;
nasShuzu = b1;
break;//找到该信元以后，解析之后直接跳出循环
}
#endregion
}
if (id != 16)
{
i = (ushort)(i + slength + 4);
}
}
#endregion
}
return(nasShuzu);
}
public int LengthS1ap = 0;//指示nas前面的s1ap的长度
/// <summary>
/// 该方法将从含有nas信令的s1ap信令编码中取出nas编码
/// </summary>
/// <param name="s1ap">s1ap信令编码</param>
/// <returns>nas编码</returns>
public byte[] nasShuzu(byte[] s1ap)
{
ushort tlength = 0; //s1ap信令的所有信元编码总长度
ushort slength = 0; //单个信元的编码长度
ushort len1 = 0; //用于判定总长度所占字节的变量
ushort len2 = 0; //用于判定单个信元长度所占字节的变量
ushort id = 0; //用于表示信元的类型
byte headLength = 0, headLength1 = 0;
byte[] Nasshuzu = new byte[1]; //用于接收解析出的nas数据流（注意：使用此种数组时一定要考虑所有情况中都需要将其初始化，否则就会出现“未初始化的数组”）
s1ap_name dir = new s1ap_name(); //用来获得direction
dir.s1ap_decode1(s1ap); //获取信令的direction
direction = (byte)dir.direction;
len1 = s1ap[3];
if (len1 >= 128)//s1ap编码总长度超过128，则长度编码为2字节
{
tlength = (ushort)((s1ap[3] & 0x0f) * 256 + s1ap[4]);
headLength = 8;//一条s1ap消息的头部长度
}
else
{
tlength = s1ap[3];
headLength = 7;
}
byte[] b = new byte[s1ap.Length - headLength];
Array.Copy(s1ap, headLength, b, 0, b.Length);
if (tlength >= 128)
{
#region
for (int i = 0; (b.Length != 0) && (i < b.Length);) //每进行一次循环i都指向信元的首部
{
id = (ushort)(b[i] * 256 + b[i + 1]);
len2 = b[i + 3];
if (len2 >= 128)
{
slength = (ushort)((b[i + 3] & 0x0f) * 256 + b[i + 4]);
headLength1 = 5;//表示一个信元的头部长度
}
else
{
slength = b[i + 3];
headLength1 = 4;
}
if (id == 26)//该信元是NAS-pdu
{
LengthS1ap = headLength + i + 5;
byte nasLength = 0;
nasLength = b[i + 4];
byte[] nas_pdu = new byte[nasLength];
Array.Copy(b, 5 + i, nas_pdu, 0, nas_pdu.Length);//nas_pdu存放的数据是nas从headerType开始到nas结束的部分（即NAS-PDU除去type，临界，两个长度值的部分）
Nasshuzu = nas_pdu;
break;
}
else
{
i = (ushort)(i + slength + headLength1);
}
}
#endregion
}
else//s1ap编码总长度不超过128，则长度编码为1字节
{
#region
for (int i = 0; (b.Length != 0) && (i < b.Length);)
{
id = (ushort)(b[i] * 256 + b[i + 1]);
slength = b[i + 3];
if (id == 26)//假设NAS-PDU的长度不超过128
{
LengthS1ap = headLength + i + 5;
byte nasLength = 0;
nasLength = b[i + 4];
byte[] nas_pdu = new byte[nasLength];
Array.Copy(b, i + 5, nas_pdu, 0, nas_pdu.Length);//nas_pdu存放的数据是nas从headerType开始到nas结束的部分（即NAS-PDU除去type，临界，两个长度值的部分）
Nasshuzu = nas_pdu;
break;
}
else
{
i = (ushort)(i + slength + 4);
}
}
#endregion
}
return(Nasshuzu);
}
