public static (long version, long value) ProcessOperatorPacket(ref BitPacket packet, PacketType type)
{
var lengthTypeId = packet.ReadNextInt(1);
var data = new List <(long version, long value)>();
switch (lengthTypeId)
{
case 0:
var totalLengthAsBits = packet.ReadNextInt(15);
var target = packet.GetOffset() + totalLengthAsBits;
while (packet.GetOffset() < target)
{
data.Add(ProcessPacket(ref packet));
}
break;
case 1:
var numberOfSubPackets = packet.ReadNextInt(11);
for (int i = 0; i < numberOfSubPackets; i++)
{
data.Add(ProcessPacket(ref packet));
}
break;
}
var version = data.Aggregate(0L, (acc, next) => acc + next.version);
var value = CalculateOperator(data.Select(x => x.value).ToList(), type);
return(version, value);
}
public override long Part2(string input)
{
var span = Parse(input);
var packet = new BitPacket(span);
var(_, value) = ProcessPacket(ref packet);
return(value);
}
public override long Part1(string input)
{
var span = Parse(input);
var packet = new BitPacket(span);
var(version, _) = ProcessPacket(ref packet);
return(version);
}
public byte[] GetBytes()
{
var result = new BitPacket();
result.WriteByte(this.Tag);
result.WriteByte(Length);
result.WriteBlock(this.Data.ToByteArray(), this.Length * 8);
return(result.ToByteArray());
}
public CADescriptor(BitPacket packet)
{
this.Tag = packet.ReadByte();
this.Length = packet.ReadByte();
//this.CASystemID = packet.ReadInt(16);
//packet.SkipBit(3);
//this.CAPID = packet.ReadInt(13);
//this.PrivateDataBytes = packet.ReadBlock((this.Length - 4) * 8);
}
public static (long version, long value) ProcessPacket(ref BitPacket packet)
{
var version = packet.ReadNextInt(3);
var typeId = packet.ReadNextEnum <PacketType>(3);
(long version, long value)data = typeId switch
{
PacketType.Literal => ProcessLiteralPacket(ref packet),
_ => ProcessOperatorPacket(ref packet, typeId),
};
return(data with {
version = data.version + version
});
}
public Descriptor(BitPacket packet)
{
this.Tag = packet.ReadByte();
this.Length = packet.ReadByte();
this.Data = new BitPacket(packet.ReadBlock(this.Length * 8));
}
public CADescriptor(Descriptor descriptor)
{
this.Tag = descriptor.Tag;
this.Length = descriptor.Tag;
this.Data = descriptor.Data;
}
