SIPSorcery.Net.STUNAttributeTypes.GetSTUNAttributeTypeForId C# (CSharp) Méthode

        public static STUNAttributeTypesEnum GetSTUNAttributeTypeForId(int stunAttributeTypeId)
        {
            return (STUNAttributeTypesEnum)Enum.Parse(typeof(STUNAttributeTypesEnum), stunAttributeTypeId.ToString(), true);
        }

        public static List <STUNAttribute> ParseMessageAttributes(byte[] buffer, int startIndex, int endIndex)
        {
            if (buffer != null && buffer.Length > startIndex && buffer.Length >= endIndex)
            {
                List <STUNAttribute> attributes = new List <STUNAttribute>();
                int startAttIndex = startIndex;

                while (startAttIndex < endIndex)
                {
                    UInt16 stunAttributeType   = BitConverter.ToUInt16(buffer, startAttIndex);
                    UInt16 stunAttributeLength = BitConverter.ToUInt16(buffer, startAttIndex + 2);
                    byte[] stunAttributeValue  = null;

                    if (BitConverter.IsLittleEndian)
                    {
                        stunAttributeType   = NetConvert.DoReverseEndian(stunAttributeType);
                        stunAttributeLength = NetConvert.DoReverseEndian(stunAttributeLength);
                    }

                    if (stunAttributeLength > 0)
                    {
                        if (stunAttributeLength + startIndex + 4 > endIndex)
                        {
                            logger.LogWarning(
                                "The attribute length on a STUN parameter was greater than the available number of bytes.");
                        }
                        else
                        {
                            stunAttributeValue = new byte[stunAttributeLength];
                            Buffer.BlockCopy(buffer, startAttIndex + 4, stunAttributeValue, 0, stunAttributeLength);
                        }
                    }

                    STUNAttributeTypesEnum attributeType =
                        STUNAttributeTypes.GetSTUNAttributeTypeForId(stunAttributeType);

                    STUNAttribute attribute = null;
                    if (attributeType == STUNAttributeTypesEnum.ChangeRequest)
                    {
                        attribute = new STUNChangeRequestAttribute(stunAttributeValue);
                    }
                    else if (attributeType == STUNAttributeTypesEnum.MappedAddress)
                    {
                        attribute = new STUNAddressAttribute(stunAttributeValue);
                    }
                    else if (attributeType == STUNAttributeTypesEnum.ErrorCode)
                    {
                        attribute = new STUNErrorCodeAttribute(stunAttributeValue);
                    }
                    else if (attributeType == STUNAttributeTypesEnum.XORMappedAddress ||
                             attributeType == STUNAttributeTypesEnum.XORPeerAddress ||
                             attributeType == STUNAttributeTypesEnum.XORRelayedAddress)
                    {
                        attribute = new STUNXORAddressAttribute(attributeType, stunAttributeValue);
                    }
                    else
                    {
                        attribute = new STUNAttribute(attributeType, stunAttributeValue);
                    }

                    attributes.Add(attribute);

                    // Attributes start on 32 bit word boundaries so where an attribute length is not a multiple of 4 it gets padded.
                    int padding = (stunAttributeLength % 4 != 0) ? 4 - (stunAttributeLength % 4) : 0;

                    startAttIndex = startAttIndex + 4 + stunAttributeLength + padding;
                }

                return(attributes);
            }
            else
            {
                return(null);
            }
        }