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6.1

VB to C# conversion

Asked by shri0809 in C# Programming Language, Microsoft Visual C#.Net, VB Objects

hello everyone,
I m trying to convert this code to C#
any help wud be appriciated

thanks

View the Solution FREE for 30 Days

         
           
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             Public Function Parse(ByVal arrStreamData() As Byte) As Boolean
        '
        Dim arrBuffer() As Byte
        Dim udtHeader As udtDNSHeader
		Dim objDnsMessage As DnsMessage = Nothing
        Dim shtLabelLength As Short
		Dim strLabel As String = String.Empty
        Dim shtCurPosition As Short
		Dim strTemp As String = String.Empty
        Dim shtTemp As Short
        Dim strStreamData As String
        Dim i As Integer
 
        '
        '## Parse the header of the DNS message
        '
        'Destroy the old object
        m_objHeader = Nothing
        '
        'Create a new one
        m_objHeader = New DnsHeader()
        '
        'Convert the String data type to a byte array
        arrBuffer = arrStreamData
        strStreamData = System.Text.Encoding.Unicode.GetString(arrBuffer)
        'Copy the string to memory
        Dim dataPointer As IntPtr = Marshal.StringToHGlobalAuto(strStreamData)
 
        '
        'Read the header of the DNS message into the
        'udtHeader structure
        udtHeader = CType(Marshal.PtrToStructure(dataPointer, GetType(udtDNSHeader)), udtDNSHeader)
 
        Marshal.FreeHGlobal(dataPointer)
        '
        'Initialize values of the properties of the m_objHeader
        'object which holds data for the Header property of this
        'class (CDnsMessage). The data are read from the members
        'of the udtHeader structure.
        With m_objHeader
            '
            .MessageId = IntegerToUnsigned(Win32.Network.ntohs(udtHeader.Identification))
            '
            .IsResponse = CBool(udtHeader.Field2 And &H80)
            .IsQuery = Not .IsResponse
            '
            If Not CBool(udtHeader.Field2 And &H8) Then .OPCode = DnsOPCode.QUERY
            If CBool(udtHeader.Field2 And &H10) Then .OPCode = DnsOPCode.IQUERY
            If CBool(udtHeader.Field2 And &H20) Then .OPCode = DnsOPCode.STATUS
            '
            .AuthoritativeAnswer = CBool(udtHeader.Field2 And &H4)
            .IsTruncated = CBool(udtHeader.Field2 And &H2)
            .RecursionDesired = CBool(udtHeader.Field2 And &H1)
            '
            .RecursionAvailable = CBool(udtHeader.Field3 And &H80)
            .ResponseCode = CShort(udtHeader.Field3 Xor &H80)
            '
            .ANCount = IntegerToUnsigned(Win32.Network.ntohs(udtHeader.ANCount))
            .ARCount = IntegerToUnsigned(Win32.Network.ntohs(udtHeader.ARCount))
            .NSCount = IntegerToUnsigned(Win32.Network.ntohs(udtHeader.NSCount))
            .QDCount = IntegerToUnsigned(Win32.Network.ntohs(udtHeader.QDCount))
            '
        End With
        '
        '## Parse the QUESTION section of the DNS message
        '
        Dim strQName As String
        Dim intQClass As Integer
        Dim intQType As Integer
        '
        mvarQuestions = Nothing
        mvarQuestions = New DnsQuestions()
        '
        'The HEADER takes 12 octets(bytes) so the QUESTION
        'section begins at 13rd octet in the stream,
        'that is 12th item in a zero-based byte array - arrBuffer
        '
        shtCurPosition = 12
        '
        strStreamData = ConversionFunctions.BytesToString(arrBuffer)
        For i = 1 To m_objHeader.QDCount
            '
            'Get lehgth of the first label of QNAME
            shtLabelLength = arrBuffer(shtCurPosition)
            '
            'The QNAME parameter of the QUESTION section
            'ends with Chr$(0) character
            Do Until shtLabelLength = 0
                '
                'Retrieve the next label of the QNAME parameter
                'The "dot" character is added at the end of each label
                strTemp = strTemp & Mid$(strStreamData, shtCurPosition + 2, shtLabelLength) & "."
                '
                'Move the stream pointer at the octet where length
                'of the next label is defined
                shtCurPosition = CShort(shtCurPosition + shtLabelLength + 1)
                '
                'Get length of the next label
                shtLabelLength = arrBuffer(shtCurPosition)
                '
            Loop
            '
            'Remove the last "dot" symbol from the strTemp string
            strQName = Left$(strTemp, Len(strTemp) - 1)
            '
            'Move the stream pointer to read the QTYPE parameter
            shtCurPosition = CShort(shtCurPosition + 1)
            '
            'Read the QTYPE parameter
 
            shtTemp = MarshalBytesToShort(arrBuffer, shtCurPosition)
            ' free memory
 
            intQType = IntegerToUnsigned(Win32.Network.ntohs(shtTemp))
            '
            'Move the stream pointer to read the QCLASS parameter
            shtCurPosition = CShort(shtCurPosition + 2)
            '
            'Read the QCLASS parameter
            shtTemp = MarshalBytesToShort(arrBuffer, shtCurPosition)
 
            intQClass = IntegerToUnsigned(Win32.Network.ntohs(shtTemp))
            '
            mvarQuestions.Add(strQName, CType(intQType, DnsTypeField), CType(intQClass, DnsClassField))
            '
        Next i  '--> For i = 1 To m_objHeader.QDCount
        '
        '## Parse the Answer,Authority, and Additional sections of the DNS message
        '
        Dim strRName As String
        Dim intRType As DnsTypeField
        Dim intRClass As Integer
        Dim dblRTTL As Double
        Dim intRDataLength As Integer
        Dim strRData As String
		Dim j As Short
        Dim intCount As Integer
        Dim arrData() As Byte
        Dim intAddress As Integer
        Dim intTemp As Integer
		Dim varData As Object = Nothing
        '
        mvarAnswers = Nothing
        mvarAnswers = New DnsResourceRecords()
        mvarAuthorities = Nothing
        mvarAuthorities = New DnsResourceRecords()
        mvarAdditionalInfos = Nothing
        mvarAdditionalInfos = New DnsResourceRecords()
        '
        'Move the stream pointer at the begining of the Answer section
        shtCurPosition = CShort(shtCurPosition + 2)
        '
        For j = 1 To 3
            '
            Select Case j
                Case 1 : intCount = m_objHeader.ANCount
                Case 2 : intCount = m_objHeader.NSCount
                Case 3 : intCount = m_objHeader.ARCount
            End Select
            '
            For i = 1 To intCount
                '
                'Get the NAME parameter
                strRName = GetLabelsByPosition(strStreamData, arrBuffer, shtCurPosition)
                '
                'Read the TYPE parameter
                shtTemp = MarshalBytesToShort(arrBuffer, shtCurPosition)
                intRType = CType(IntegerToUnsigned(Win32.Network.ntohs(shtTemp)), DnsTypeField)
                '
                'Move the pointer to read the CLASS parameter
                shtCurPosition = CShort(shtCurPosition + 2)
                '
                'Read the CLASS parameter
                shtTemp = MarshalBytesToShort(arrBuffer, shtCurPosition)
                intRClass = IntegerToUnsigned(Win32.Network.ntohs(shtTemp))
                '
                'Move the pointer to read the TTL parameter
                shtCurPosition = CShort(shtCurPosition + 2)
                '
                'Read the TTL parameter
                intTemp = MarshalBytesToInteger(arrBuffer, shtCurPosition)
                dblRTTL = LongToUnsigned(Win32.Network.ntohl(intTemp))
                '
                'Move the pointer to read the RDLENGTH parameter
                shtCurPosition = CShort(shtCurPosition + 4)
                '
                'Read the RDLENGTH parameter
                shtTemp = MarshalBytesToShort(arrBuffer, shtCurPosition)
                intRDataLength = IntegerToUnsigned(Win32.Network.ntohs(shtTemp))
                '
                'Move the pointer to read the RDATA parameter
                shtCurPosition = CShort(shtCurPosition + 2)
                '
                Select Case intRType
                    Case DnsTypeField.DNS_TYPE_A
                        'IP address
                        intAddress = MarshalBytesToInteger(arrBuffer, shtCurPosition)
                        Dim pointer As IntPtr = New IntPtr(Win32.Network.inet_ntoa(intAddress))
                        strRData = Marshal.PtrToStringAnsi(pointer)    'StringFromPointer(inet_ntoa(lngAddress))
                        varData = strRData
                        shtCurPosition = CShort(shtCurPosition + 4)
                    Case DnsTypeField.DNS_TYPE_CNAME, DnsTypeField.DNS_TYPE_NS, DnsTypeField.DNS_TYPE_MB, DnsTypeField.DNS_TYPE_MG, DnsTypeField.DNS_TYPE_MR, DnsTypeField.DNS_TYPE_PTR
                        'Domain name
                        strRData = GetLabelsByPosition(strStreamData, arrBuffer, shtCurPosition)
                        varData = strRData
                        '
                    Case DnsTypeField.DNS_TYPE_MX
                        '
                        Dim objMxData As DnsMxData
                        objMxData = New DnsMxData()
                        '
                        arrData = arrStreamData
                        '
                        If objMxData.CreateFromStream(arrData, shtCurPosition) Then
                            varData = objMxData
                        End If
                        '
                    Case DnsTypeField.DNS_TYPE_SOA
                        '
                        Dim objSoaData As DnsSoaData
                        objSoaData = New DnsSoaData()
                        '
                        If objSoaData.CreateFromStream(arrBuffer, shtCurPosition) Then
                            varData = objSoaData
                        End If
                        '
                End Select
 
                Select Case j
                    Case 1
                        mvarAnswers.Add(strRName, intRType, intRClass, dblRTTL, intRDataLength, varData)
                    Case 2
                        mvarAuthorities.Add(strRName, intRType, intRClass, dblRTTL, intRDataLength, varData)
                    Case 3
                        mvarAdditionalInfos.Add(strRName, intRType, intRClass, dblRTTL, intRDataLength, varData)
                End Select
                '
            Next i
            '
        Next j
        '
        Return True
    End Function

           
         

20091021-EE-VQP-81 - Hierarchy / EE_QW_3_20080625

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VB to C# conversion

Asked by shri0809 in C# Programming Language, Microsoft Visual C#.Net, VB Objects

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