static Dictionary <string, byte[][]> dataTemp = new Dictionary <string, byte[][]>(); //存储临时数据包数据，用于重发
/// <summary>
/// 获取分片udp数据集合
/// </summary>
/// <param name="source">原数据包</param>
/// <param name="blockSize">块大小</param>
/// <returns></returns>
public static List <byte[]> DataFragme(byte[] source, int blockSize = 50000)
{
List <byte[]> list = new List <byte[]>();
string key = DateTime.Now.ToString("yyyyMMddhhmmssff");//单任务唯一标识
byte[] keyBuff = Encoding.UTF8.GetBytes(key);
int bls = source.Length / blockSize;
//计算包个数
if (source.Length % blockSize != 0)
{
bls++;
}
byte[] blocks = BitConverter.GetBytes(bls);
byte[] id = BitConverter.GetBytes(0);
//报头序列约定:单任务标识,id,包分组数
byte[] headBuff = new byte[24];
keyBuff.CopyTo(headBuff, 0);
id.CopyTo(headBuff, 16);
blocks.CopyTo(headBuff, 20);
list.Add(headBuff);
if (source.Length < blockSize)
{
id = BitConverter.GetBytes(1);//该包编号
byte[] len = BitConverter.GetBytes(source.Length + 1);
byte[] overBuff = new byte[source.Length + 25];
keyBuff.CopyTo(overBuff, 0);
id.CopyTo(overBuff, keyBuff.Length);
len.CopyTo(overBuff, keyBuff.Length + id.Length);
source.CopyTo(overBuff, 24);
byte crc = CRC8.CRC(source);
overBuff[overBuff.Length - 1] = crc;
list.Add(overBuff);
return(list);
}
//子报头序列约定:单任务标识,id,子包有效数据长度
int block = 0;
for (int i = 1; block != source.Length; i++)
{
byte[] bys = source.Take(block + blockSize).Skip(block).ToArray(); //当次分块数据
block += bys.Length;
id = BitConverter.GetBytes(i); //该包编号
byte[] len = BitConverter.GetBytes(bys.Length + 1); //包长度
byte[] overBuff = new byte[bys.Length + 25];
//CRC校验位附加
byte crc = CRC8.CRC(bys);
byte[] temp = new byte[bys.Length + 1];
bys.CopyTo(temp, 0);
temp[temp.Length - 1] = crc;
bys = temp;
keyBuff.CopyTo(overBuff, 0);
id.CopyTo(overBuff, keyBuff.Length);
len.CopyTo(overBuff, keyBuff.Length + id.Length);
bys.CopyTo(overBuff, 24);
list.Add(overBuff);
}
if (!dataTemp.ContainsKey(key))
{
dataTemp.Add(key, list.ToArray());
}
StartWaitRequest(key);
return(list);
}
