akpaevj-executor-scripts/Common/BytesHelper.sbsl

@Global
method IndexOf(Data1: Bytes, Data2: Bytes): Number
    var StartIndex = -1
    var Data2Index = 0

    for Data1Index = 0 to Data1.Length() - 1
        val Data1Char = Data1.GetRange(Data1Index, Data1Index + 1)
        val Data2Char = Data2.GetRange(Data2Index, Data2Index + 1)

        if Data1Char != Data2Char and StartIndex != -1
            // doesn't match pattern
            StartIndex = -1
            Data2Index = 0
            continue
        ;

        if Data1Char == Data2Char
            if StartIndex == -1
                StartIndex = Data1Index
            ;
            Data2Index += 1
        ;

        if Data2Index >= Data2.Length()
            break
        ;
    ;

    return StartIndex
;

@Global
method Contains(Data1: Bytes, Data2: Bytes): Boolean
    return IndexOf(Data1, Data2) != -1
;

@Global
method StartsWith(Data1: Bytes, Data2: Bytes): Boolean
    return IndexOf(Data1, Data2) == 0
;

@Global
method StartsWith(Data1: Bytes, HexString: String): Boolean
    return IndexOf(Data1, new Bytes(HexString.Replace(" ", ""))) == 0
;


@Global
method EndsWith(Data1: Bytes, Data2: Bytes): Boolean
    val Index = IndexOf(Data1, Data2) 
    return Index + Data2.Length() == Data1.Length()
;

@Global
method EndsWith(Data1: Bytes, HexString: String): Boolean
    val Data2 = new Bytes(HexString.Replace(" ", ""))
    val Index = IndexOf(Data1, Data2) 
    return Index + Data2.Length() == Data1.Length()
;

@Global
method At(Data: Bytes, Index: Number): Bytes
    return Data.GetRange(Index, Index + 1)
;

@Global
method TrimStart(Data: Bytes, TrimBytes: Bytes): Bytes
    if Data.Length() < TrimBytes.Length()
        return Data
    ;

    var StartOffset = 0

    while StartsWith(Data.GetRange(StartOffset), TrimBytes)
        StartOffset += TrimBytes.Length()

        if TrimBytes.Length() > Data.Length() - StartOffset
            break
        ;
    ;

    return Data.GetRange(StartOffset)
;

@Global
method TrimEnd(Data: Bytes, TrimBytes: Bytes): Bytes
    if Data.Length() < TrimBytes.Length()
        return Data
    ;

    var EndOffset = 0

    while EndsWith(Data.GetRange(0, Data.Length() - EndOffset), TrimBytes)
        EndOffset += TrimBytes.Length()
    ;

    return Data.GetRange(0, Data.Length() - EndOffset)
;

@Global
method Trim(Data: Bytes, TrimBytes: Bytes): Bytes
    var Result = TrimStart(Data, TrimBytes)
    return TrimEnd(Result, TrimBytes)
;

@Global
method Reverse(Data: Bytes): Bytes
    if Data.Length() == 0
        return Data
    ;

    use OutStream = new TemporaryWritableStream(Data.Size())

    var Index = Data.Length() - 1

    while Index >= 0
        OutStream.Write(At(Data, Index))
        Index -= 1
    ;

    use InStream = OutStream.OpenReadableStream()

    return InStream.ReadAsBytes()
;

@Global
method ToChar(Data: Bytes): Number
    if Data.Length() != 1
        throw new IllegalStateException("Data length must be 1")
    ;

    val Str = Data.ToString()
    var Index = Str.Length() - 1
    var Result = 0

    while Index >= 0
        val Character = Str.CharAt(Index)
        val Multiplier = Pow(16, Str.Length() - 1 - Index)

        case Character.ToUpperCase()
        when "A"
            Result += 10 * Multiplier
        when "B"
            Result += 11 * Multiplier
        when "C"
            Result += 12 * Multiplier
        when "D"
            Result += 13 * Multiplier
        when "E"
            Result += 14 * Multiplier
        when "F"
            Result += 15 * Multiplier
        else
            Result += new Number(Character) * Multiplier
        ;

        Index -= 1
    ;

    return Result
;