/// <summary>
/// Decode badges to content
/// </summary>
/// <param name="badges"></param>
/// <param name="receiver"></param>
/// <returns></returns>
public string Decode(List <Badge> badges, string receiver = "")
{
var finalText = string.Empty;
// physical
var finalInt = E2HttpProtocol.DecodeBadges(badges);
// visualization purpose only
finalText += finalInt.ToBinaryString();
// transaction
var contentInt = ReadTransactionCode(finalInt, receiver, out var protocolType);
// application
var chars = ContentEncoder.DecodeContent(protocolType, contentInt);
// visualization purpose only
while (finalText.Length < 57)
{
finalText = @"0" + finalText;
}
finalText = new string(chars.ToArray()) + @" (" + finalText + ")";
return(finalText);
}
/// <summary>
/// Encode content to badges
/// </summary>
/// <param name="encodeType"></param>
/// <param name="protocol"></param>
/// <param name="content"></param>
/// <param name="receiver"></param>
/// <returns></returns>
public List <Badge> Encode(EncodeType encodeType, Protocol protocol, string content, string receiver = "")
{
BigInteger bigInt = 0;
var maxDataBits = 35;
// bit 0 -> type
if (encodeType == EncodeType.Unicast)
{
bigInt |= 1;
}
else
{
maxDataBits += 13;
}
// encode content (application layer)
var contentInt = ContentEncoder.EncodeContent(protocol, content, maxDataBits);
// transaction
var transactionInt = GenerateTransactionCode(encodeType, protocol, bigInt, contentInt, receiver);
// phyiscal
var badges = E2HttpProtocol.GenerateBadges(transactionInt);
return(badges);
}
private static BigInteger ReadTransactionCode(BigInteger finalInt, string receiver, out int protocolType)
{
// bit 22 - 56 -> Body text
var contentInt = finalInt & 0x7FFFFFFFF;
finalInt >>= 35;
// bit 19 - 21 -> CheckSum
var checkSum = (int)(finalInt & 0b111);
finalInt >>= 3;
// bit 14 - 18 -> Protocol type
protocolType = (int)(finalInt & 0b11111);
finalInt >>= 5;
// bit 1 - 13 -> ID / Extended body text
var extendedData = finalInt & 0x1FFF;
finalInt >>= 13;
// bit 0 -> type
var encodeType = (int)finalInt;
var encode = (EncodeType)encodeType;
if (encode == EncodeType.Broadcast)
{
extendedData <<= 35;
contentInt = extendedData | contentInt;
}
else if (encode == EncodeType.Unicast)
{
var receiverCode = ContentEncoder.EncodeContent(Protocol.UNICODE, receiver, int.MaxValue) % 0x1FFF;
if (receiverCode != extendedData || string.IsNullOrEmpty(receiver))
{
throw new Exception(@"Receiver mismatched");
}
}
if (checkSum != CheckSum(contentInt))
{
throw new Exception(@"Check sum failure");
}
return(contentInt);
}
private static BigInteger GenerateTransactionCode(EncodeType encodeType, Protocol protocol, BigInteger bigInt,
BigInteger contentInt, string receiver)
{
// bit 1 - 13 -> ID / Extended body text
bigInt <<= 13;
if (encodeType == EncodeType.Unicast)
{
var receiverInt = ContentEncoder.EncodeContent(Protocol.UNICODE, receiver, int.MaxValue);
bigInt |= receiverInt % 0x1FFF;
}
else if (encodeType == EncodeType.Broadcast)
{
var extendedContent = contentInt >> 35;
bigInt |= extendedContent;
}
Console.WriteLine(bigInt.ToBinaryString());
// bit 14 - 18 -> Protocol type
bigInt <<= 5;
bigInt |= (int)protocol;
// bit 19 - 21 -> CheckSum
bigInt <<= 3;
bigInt |= CheckSum(contentInt);
// bit 22 - 56 -> Body text
bigInt <<= 35;
switch (protocol)
{
case Protocol.UNICODE:
case Protocol.ASCII:
case Protocol.ALPHABET:
Console.WriteLine(contentInt.ToBinaryString());
var contentLeftOver = contentInt & 0x7FFFFFFFF;
Console.WriteLine(contentLeftOver.ToBinaryString());
Console.WriteLine();
bigInt |= contentLeftOver;
break;
}
var transactionInt = bigInt;
return(transactionInt);
}
