private static void ParseHTCapabilities(InformationElement ie, TypeNSettings settings) { settings.Is40Mhz = ((ie.ItsData[0] & 0x02) == 0x02); settings.ShortGi20MHz = (ie.ItsData[0] & 0x20) == 0x20; settings.ShortGi40MHz = (ie.ItsData[0] & 0x40) == 0x40; //Get supported MCS indexes //1 bit per index byte[] bits = new byte[4]; //Array.ConstrainedCopy(ies, index + 5, bits, 0, 4); Array.Copy(ie.ItsData, 4, bits, 0, 4); BitArray b = new BitArray(bits); //settings.Rates = new List<double>(); //The MCS indexes are in little endian, //so this loop will start at the lowest rates for (int i = 0; i < b.Length; i++) { //If the MCS index bit is 0, skip it if (b[i] == false) { continue; } //Add the rate settings.Rates.Add(McsSet.GetSpeed((uint)i, settings.ShortGi20MHz, settings.ShortGi40MHz, settings.Is40Mhz)); } }
public TypeNSettings(TypeNSettings settings) { Is40Mhz = settings.Is40Mhz; ShortGi20MHz = settings.ShortGi20MHz; ShortGi40MHz = settings.ShortGi40MHz; PrimaryChannel = settings.PrimaryChannel; SecondaryChannelLower = settings.SecondaryChannelLower; //MaxMcs = settings.MaxMcs; Rates = settings.Rates; }
public override bool Equals(object obj) { if (obj is TypeNSettings) { TypeNSettings set = (TypeNSettings)obj; bool yes = set.Is40Mhz == Is40Mhz; yes &= set.ShortGi20MHz == ShortGi20MHz; yes &= set.ShortGi40MHz == ShortGi40MHz; yes &= set.PrimaryChannel == PrimaryChannel; yes &= set.SecondaryChannelLower == SecondaryChannelLower; //Don't compare rates return(yes); } return(false); }
private static void ParseHTOperation(InformationElement ie, TypeNSettings settings) { const int channel = 0; const int subset1 = 1; //Primary channel settings.PrimaryChannel = ie.ItsData[0]; //Secondary channel location settings.SecondaryChannelLower = (ie.ItsData[channel] & 0x03) == 0x03; //Check if there is no secondary channel and set 40MHz to false if (settings.Is40Mhz) { settings.Is40Mhz = (ie.ItsData[subset1] & 0x03) == 0x03 || (ie.ItsData[subset1] & 0x01) == 0x01; } }
public static TypeNSettings Parse(byte[] ies) { var informationElements = BuildInformationElements(ies); var settings = new TypeNSettings(); bool returnNull = true; foreach (var informationElement in informationElements) { switch (informationElement.ItsNumber) { case 45: //HT Capabilities ParseHTCapabilities(informationElement, settings); returnNull = false; break; case 61: //HT Information ParseHTOperation(informationElement, settings); returnNull = false; break; } } return returnNull ? null : settings; }
public static TypeNSettings Parse(byte[] ies) { var informationElements = BuildInformationElements(ies); var settings = new TypeNSettings(); bool returnNull = true; foreach (var informationElement in informationElements) { switch (informationElement.ItsNumber) { case 45: //HT Capabilities ParseHTCapabilities(informationElement, settings); returnNull = false; break; case 61: //HT Information ParseHTOperation(informationElement, settings); returnNull = false; break; } } return(returnNull ? null : settings); }
public TypeNSettings(TypeNSettings settings) { Is40Mhz = settings.Is40Mhz; ShortGi20MHz = settings.ShortGi20MHz; ShortGi40MHz = settings.ShortGi40MHz; PrimaryChannel = settings.PrimaryChannel; SecondaryChannelLower = settings.SecondaryChannelLower; //MaxMcs = settings.MaxMcs; Rates = settings.Rates; }
private static void ParseHTCapabilities(InformationElement ie, TypeNSettings settings) { settings.Is40Mhz = ((ie.ItsData[0] & 0x02) == 0x02); settings.ShortGi20MHz = (ie.ItsData[0] & 0x20) == 0x20; settings.ShortGi40MHz = (ie.ItsData[0] & 0x40) == 0x40; //Get supported MCS indexes //1 bit per index byte[] bits = new byte[4]; //Array.ConstrainedCopy(ies, index + 5, bits, 0, 4); Array.Copy(ie.ItsData, 4, bits, 0, 4); BitArray b = new BitArray(bits); //settings.Rates = new List<double>(); //The MCS indexes are in little endian, //so this loop will start at the lowest rates for (int i = 0; i < b.Length; i++) { //If the MCS index bit is 0, skip it if (b[i] == false) continue; //Add the rate settings.Rates.Add(McsSet.GetSpeed((uint) i, settings.ShortGi20MHz, settings.ShortGi40MHz, settings.Is40Mhz)); } }
private static void ParseHTOperation(InformationElement ie, TypeNSettings settings) { const int channel = 0; const int subset1 = 1; //Primary channel settings.PrimaryChannel = ie.ItsData[0]; //Secondary channel location settings.SecondaryChannelLower = (ie.ItsData[channel] & 0x03) == 0x03; //Check if there is no secondary channel and set 40MHz to false if (settings.Is40Mhz) settings.Is40Mhz = (ie.ItsData[subset1] & 0x03) == 0x03 || (ie.ItsData[subset1] & 0x01) == 0x01; }
/*public static TypeNSettings Parse(byte[] ies) { try { int index = -1; //for (int i = 0; i < ies.Length; i++) for (int i = 0; i < ies.Length - 31; i++) { //loop until we find the HT IE field 41 with length of 26 and the extended info futher down //HT IE 1's signature is 2D 1A //HT IE 2's signature is 3D 16 if ((ies[i] == 0x2D && ies[i + 1] == 0x1A) && (ies[i + 28] == 0x3D && ies[i + 29] == 0x16)) { index = i; break; } } if (index == -1) return null; // We know that ies.Length > index + 31 so all of the following array indexes should be in bounds TypeNSettings settings = new TypeNSettings { Is40MHz = ((ies[index + 2] & 0x02) == 0x02), ShortGi20MHz = (ies[index + 2] & 0x20) == 0x20, ShortGi40MHz = (ies[index + 2] & 0x40) == 0x40 }; //Supported MCS indexes //1 bit per index byte[] bits = new byte[4]; Array.ConstrainedCopy(ies, index + 5, bits, 0, 4); BitArray b = new BitArray(bits); settings.Rates = new List<double>(); int maxIndex = -1; for (int i = 0; i < b.Length; i++) { if (b[i] == false) continue; //Update the highest MCS index if (b[i]) maxIndex = i; //Add the rate settings.Rates.Add(McsSet.GetSpeed((uint)i, settings.ShortGi20MHz, settings.ShortGi40MHz, settings.Is40MHz)); } if (maxIndex == -1) return null; // there has been an error //settings.MaxMcs = (uint)maxIndex; //Extended info //Primary channel settings.PrimaryChannel = ies[index + 30]; //Secondary channel location settings.SecondaryChannelLower = (ies[index + 31] & 0x03) == 0x03; //Check if there is no secondary channel and set 40MHz to false if (settings.Is40MHz) settings.Is40MHz = (ies[index + 31] & 0x03) == 0x03 || (ies[index + 31] & 0x01) == 0x01; return settings; } catch (IndexOutOfRangeException) { //We can't get the 802.11n IEs. Just return null return null; } }*/ public static TypeNSettings Parse(byte[] ies) { //The indexes for both elements int HtCapIndex = -1; int HtInfoIndex = -1; bool returnNull = true; //Look for the HT Capabilities element for (int i = 0; i < ies.Length - 31; i++) { //HT Capabilities's signature is 2D 1A if ((ies[i] == 0x2D && ies[i + 1] == 0x1A) && (ies.Length >= i + 27)) { //Found it HtCapIndex = i; } //HT Information's signature is 3D 16 if ((ies[i] == 0x3D && ies[i + 1] == 0x16) && (ies.Length >= i + 24)) { //Found it HtInfoIndex = i; } } TypeNSettings settings = new TypeNSettings(); //Parse the info blocks if we found them if (HtCapIndex > -1) { settings.Is40MHz = ((ies[HtCapIndex + 2] & 0x02) == 0x02); settings.ShortGi20MHz = (ies[HtCapIndex + 2] & 0x20) == 0x20; settings.ShortGi40MHz = (ies[HtCapIndex + 2] & 0x40) == 0x40; //Get supported MCS indexes //1 bit per index byte[] bits = new byte[4]; //Array.ConstrainedCopy(ies, index + 5, bits, 0, 4); Array.Copy(ies, HtCapIndex + 5, bits, 0, 4); BitArray b = new BitArray(bits); //settings.Rates = new List<double>(); //The MCS indexes are in little endian, //so this loop will start at the lowest rates for (int i = 0; i < b.Length; i++) { //If the MCS index bit is 0, skip it if (b[i] == false) continue; //Add the rate settings.Rates.Add(McsSet.GetSpeed((uint)i, settings.ShortGi20MHz, settings.ShortGi40MHz, settings.Is40MHz)); } returnNull = false; } if (HtInfoIndex > -1) { //Primary channel settings.PrimaryChannel = ies[HtInfoIndex + 2]; //Secondary channel location settings.SecondaryChannelLower = (ies[HtInfoIndex + 3] & 0x03) == 0x03; //Check if there is no secondary channel and set 40MHz to false if (settings.Is40MHz) settings.Is40MHz = (ies[HtInfoIndex + 3] & 0x03) == 0x03 || (ies[HtInfoIndex + 3] & 0x01) == 0x01; returnNull = false; } return returnNull ? null : settings; }
public static TypeNSettings Parse(byte[] ies) { try { int index = -1; //for (int i = 0; i < ies.Length; i++) for (int i = 0; i < ies.Length - 31; i++) { //loop until we find the HT IE field 41 with length of 26 and the extended info futher down //HT IE 1's signature is 2D 1A //HT IE 2's signature is 3D 16 if ((ies[i] == 0x2D && ies[i + 1] == 0x1A) && (ies[i + 28] == 0x3D && ies[i + 29] == 0x16)) { index = i; break; } } if (index == -1) return null; // We know that ies.Length > index + 31 so all of the following array indexes should be in bounds TypeNSettings settings = new TypeNSettings { Is40MHz = ((ies[index + 2] & 0x02) == 0x02), ShortGi20MHz = (ies[index + 2] & 0x20) == 0x20, ShortGi40MHz = (ies[index + 2] & 0x40) == 0x40 }; //Supported MCS indexes //1 bit per index byte[] bits = new byte[4]; Array.ConstrainedCopy(ies, index + 5, bits, 0, 4); BitArray b = new BitArray(bits); settings.Rates = new List<double>(); int maxIndex = -1; for (int i = 0; i < b.Length; i++) { if (b[i] == false) continue; //Update the highest MCS index if (b[i]) maxIndex = i; //Add the rate settings.Rates.Add(McsSet.GetSpeed((uint) i, settings.ShortGi20MHz, settings.ShortGi40MHz, settings.Is40MHz)); } if (maxIndex == -1) return null; // there has been an error settings.MaxMcs = (uint) maxIndex; //Extended info //Primary channel settings.PrimaryChannel = ies[index + 30]; //Secondary channel location settings.SecondaryChannelLower = (ies[index + 31] & 0x03) == 0x03; //Check if there is no secondary channel and set 40MHz to false if (settings.Is40MHz) settings.Is40MHz = (ies[index + 31] & 0x03) == 0x03 || (ies[index + 31] & 0x01) == 0x01; return settings; } catch(IndexOutOfRangeException) { //We can't get the 802.11n IEs. Just return null return null; } }