Option Explicit On

Module Conversions

    Private Const OFFSET_2 = 65536
    Private Const MAXINT_2 = 32767
    Private Const OFFSET_4 = 4294967296
    Private Const MAXINT_4 = 2147483647

    Function UnsignedToShort(ByVal Value As UShort) As Short
        If Value <= MAXINT_2 Then
            UnsignedToShort = Value
        Else
            UnsignedToShort = Value - OFFSET_2
        End If
    End Function

    Function ShortToUnsigned(ByVal Value As Short) As UShort
        If Value < 0 Then
            ShortToUnsigned = Value + OFFSET_2
        Else
            ShortToUnsigned = Value
        End If
    End Function

    Function UnsignedToInteger(ByVal Value As UInteger) As Integer
        If Value <= MAXINT_4 Then
            UnsignedToInteger = Value
        Else
            UnsignedToInteger = Value - OFFSET_4
        End If
    End Function

    Function IntegerToUnsigned(ByVal Value As Integer) As UInteger
        If Value < 0 Then
            IntegerToUnsigned = Value + OFFSET_4
        Else
            IntegerToUnsigned = Value
        End If
    End Function

    'prende solo la parte positiva, se no 0
    Function LongToUInt(ByVal Value As Long) As UInteger
        If Value < 0 Then
            LongToUInt = 0
        Else
            LongToUInt = CUInt(Value)
        End If
    End Function


    'Public Function WordToByte(ByVal Word As Int16, ByVal LevelByte As Byte) As Byte
    '    Dim szTmp As String

    '    szTmp = Hex(Word)

    '    While Len(szTmp) < 4
    '        szTmp = "0" & szTmp
    '    End While

    '    If LevelByte = LOW_ORDER Then
    '        WordToByte = Val("&h" & Mid(szTmp, 3, 2))
    '    ElseIf LevelByte = HIGH_ORDER Then
    '        WordToByte = Val("&h" & Mid(szTmp, 1, 2))
    '    End If
    'End Function

    Public Function WordToByte(ByVal Word As UInt16, ByVal LevelByte As Byte) As Byte
        Dim Value() As Byte = BitConverter.GetBytes(Word)
        WordToByte = Value(LevelByte)
    End Function

    Public Function ShortToByte(ByVal [Short] As Int16, ByVal LevelByte As Byte) As Byte
        Dim Value() As Byte = BitConverter.GetBytes([Short])
        ShortToByte = Value(LevelByte)
    End Function

    Public Function ByteToWord(ByVal LowOrderByte As Byte, ByVal HighOrderByte As Byte) As UInt16
        Dim Value() As Byte = {LowOrderByte, HighOrderByte}
        ByteToWord = BitConverter.ToUInt16(Value, 0)
    End Function

    Public Function ByteToShort(ByVal LowOrderByte As Byte, ByVal HighOrderByte As Byte) As Int16
        Dim Value() As Byte = {LowOrderByte, HighOrderByte}
        ByteToShort = BitConverter.ToInt16(Value, 0)
    End Function

    Public Function UIntegerToSingle(ByVal [UInteger] As UInt32) As Single
        Dim Value() As Byte = BitConverter.GetBytes([UInteger])
        UIntegerToSingle = BitConverter.ToSingle(Value, 0)
    End Function

    Public Function SingleToUInteger(ByVal [Single] As Single) As UInt32
        Dim Value() As Byte = BitConverter.GetBytes([Single])
        SingleToUInteger = BitConverter.ToUInt32(Value, 0)
    End Function


    Public Function DWordToWord(ByVal DWord As UInt32, ByVal LevelWord As Byte) As UInt16
        Dim Value() As Byte = BitConverter.GetBytes(DWord)
        DWordToWord = ByteToWord(Value(0 + 2 * LevelWord), Value(1 + 2 * LevelWord))
    End Function

    Public Function DWordToShort(ByVal DWord As UInt32, ByVal LevelWord As Byte) As Int16
        Dim Value() As Byte = BitConverter.GetBytes(DWord)
        DWordToShort = ByteToShort(Value(0 + 2 * LevelWord), Value(1 + 2 * LevelWord))
    End Function

    Public Function IntegerToWord(ByVal [Integer] As Int32, ByVal LevelWord As Byte) As UInt16
        Dim Value() As Byte = BitConverter.GetBytes([Integer])
        IntegerToWord = ByteToWord(Value(0 + 2 * LevelWord), Value(1 + 2 * LevelWord))
    End Function

    Public Function IntegerToShort(ByVal [Integer] As Int32, ByVal LevelWord As Byte) As Int16
        Dim Value() As Byte = BitConverter.GetBytes([Integer])
        IntegerToShort = ByteToShort(Value(0 + 2 * LevelWord), Value(1 + 2 * LevelWord))
    End Function


    Public Function WordsToDWord(ByVal LowOrderWord As UInt16, ByVal HighOrderWord As UInt16) As UInt32
        Dim ValueLow() As Byte = BitConverter.GetBytes(LowOrderWord)
        Dim ValueHigh() As Byte = BitConverter.GetBytes(HighOrderWord)
        Dim Value() As Byte = {ValueLow(0), ValueLow(1), ValueHigh(0), ValueHigh(1)}
        WordsToDWord = BitConverter.ToUInt32(Value, 0)
    End Function

    Public Function WordsToInteger(ByVal LowOrderWord As UInt16, ByVal HighOrderWord As UInt16) As Int32
        Dim ValueLow() As Byte = BitConverter.GetBytes(LowOrderWord)
        Dim ValueHigh() As Byte = BitConverter.GetBytes(HighOrderWord)
        Dim Value() As Byte = {ValueLow(0), ValueLow(1), ValueHigh(0), ValueHigh(1)}
        WordsToInteger = BitConverter.ToInt32(Value, 0)
    End Function

    Public Function ShortsToDWord(ByVal LowOrderShort As Int16, ByVal HighOrderShort As Int16) As UInt32
        Dim ValueLow() As Byte = BitConverter.GetBytes(LowOrderShort)
        Dim ValueHigh() As Byte = BitConverter.GetBytes(HighOrderShort)
        Dim Value() As Byte = {ValueLow(0), ValueLow(1), ValueHigh(0), ValueHigh(1)}
        ShortsToDWord = BitConverter.ToUInt32(Value, 0)
    End Function

    Public Function ShortsToInteger(ByVal LowOrderShort As Int16, ByVal HighOrderShort As Int16) As Int32
        Dim ValueLow() As Byte = BitConverter.GetBytes(LowOrderShort)
        Dim ValueHigh() As Byte = BitConverter.GetBytes(HighOrderShort)
        Dim Value() As Byte = {ValueLow(0), ValueLow(1), ValueHigh(0), ValueHigh(1)}
        ShortsToInteger = BitConverter.ToInt32(Value, 0)
    End Function


    Function ArraysEqual(ByVal first As Int16(), ByVal second As Int16()) As Boolean
        If (first Is second) Then
            Return True
        End If
        If (first Is Nothing OrElse second Is Nothing) Then
            Return False
        End If
        If (first.Length <> second.Length) Then
            Return False
        End If
        For i As Integer = 0 To first.Length - 1
            If (first(i) <> second(i)) Then
                Return False
            End If
        Next i
        Return True
    End Function

End Module