public static UDPPackage Parse(byte[] bytes)
{
Stream stream = new MemoryStream(bytes);
BinaryReader reader = new BinaryReader(stream);
uint crc = reader.ReadUInt32();
uint checkCRC = CRC32.Calculate(reader.ReadBytes(bytes.Length - 4));
if (crc != checkCRC)
{
return(new UDPPackage()); //пакет битый
}
stream.Position = 4;
uint sign = reader.ReadUInt32();
ushort parts = reader.ReadUInt16();
BytesList body = new BytesList();
if (parts == 0)
{
body.Add(reader.ReadBytes(bytes.Length - 4 - 4 - 2));
return(new UDPPackage(body, sign));
}
else
{
ushort part = reader.ReadUInt16();
ushort partsPackageId = reader.ReadUInt16();
body.Add(reader.ReadBytes(bytes.Length - 4 - 4 - 2 - 2 - 2));
return(new UDPPackage(partsPackageId, parts, part, body, sign));
}
}
public void TestNested()
{
var ba1 = new BytesList();
var ba2 = new BytesList();
ba1.Add(new[] { (byte)'a', (byte)'b', (byte)'c' });
ba1.Add(new[] { (byte)'d', (byte)'e' });
ba2.Add(new[] { (byte)'f', (byte)'g' });
ba2.Add((byte)'h');
ba2.Add(ba1);
Assert.AreEqual(8, ba2.BytesLength);
byte[] bytes = ba2.Bytes();
var ascii = Encoding.ASCII.GetString(bytes);
Assert.AreEqual("fghabcde", ascii);
}
public UDPPackage(BytesList body, UInt32 sign = 0)
{
this.Body = body;
this.Sign = sign;
BytesList preCRCData = new BytesList();
preCRCData.AddUInt(this.Sign);
preCRCData.AddUShort(this.Parts);//==0
preCRCData.Add(body);
this.CRC = CRC32.Calculate(preCRCData);
this.FullData.AddUInt(this.CRC);
this.FullData.Add(preCRCData);
}
public ShellCommand(CommandBaseUDP command, ushort initPartsPackageId)
{
if (command.BytesList.Count > maxByteSize)
{
ushort parts = (ushort)(command.BytesList.Count / maxByteSize);
this.PartsPackageId = initPartsPackageId;
for (ushort part = 0; part < parts; part++)
{
BytesList data = new BytesList(); data.Add(command.BytesList.GetBytes(maxByteSize * part, maxByteSize));
this.Packages.Add(new UDPPackage(this.PartsPackageId, parts, part, data));
}
}
else
{
this.Packages.Add(new UDPPackage(command.BytesList));
}
}
public UDPPackage(ushort partsPackageId, ushort parts, ushort part, BytesList body, UInt32 sign = 0)
{
this.PartsPackageId = partsPackageId;
this.Parts = parts;
this.Part = part;
this.Body = body;
this.Sign = sign;
BytesList preCRCData = new BytesList();
preCRCData.AddUInt(this.Sign);
preCRCData.AddUShort(this.Parts);//!=0
preCRCData.AddUShort(this.Part);
preCRCData.AddUShort(this.PartsPackageId);
preCRCData.Add(body);
this.CRC = CRC32.Calculate(preCRCData);
this.FullData.AddUInt(this.CRC);
this.FullData.Add(preCRCData);
}