/// <summary>
/// 尝试将收到的网络包解析为实体
/// </summary>
/// <param name="pack">收到的网络包</param>
/// <returns></returns>
/// <remarks>如果收到的包是分片包，且其所有子包尚未接受完全，则会返回空值</remarks>
public static Msg TryToTranslateMessage(PacketNetWorkMsg pack)
{
if (pack == null || pack.PackageIndex > pack.PackageCount - 1)
{
return(null);
}
else if (pack.PackageCount == 1)
{
return(ParseToMessage(pack));
}
else
{
lock (packageCache)
{
if (packageCache.ContainsKey(pack.PackageNo))
{
PacketNetWorkMsg[] array = packageCache[pack.PackageNo];
array[pack.PackageIndex] = pack;
//检测是否完整
if (Array.FindIndex(array, s => s == null) == -1)
{
packageCache.Remove(pack.PackageNo);
return(ParseToMessage(array));
}
else
{
return(null);
}
}
else
{
PacketNetWorkMsg[] array = new PacketNetWorkMsg[pack.PackageCount];
array[pack.PackageIndex] = pack;
packageCache.Add(pack.PackageNo, array);
return(null);
}
}
}
}
/// <summary>
/// 将网络信息解析为封包
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
public static PacketNetWorkMsg Parse(byte[] buffer, IPEndPoint clientAddress)
{
if (!Test(buffer))
{
return(null);
}
PacketNetWorkMsg p = new PacketNetWorkMsg()
{
RemoteIP = clientAddress,
SendTimes = 0
};
p.PackageNo = BitConverter.ToInt64(buffer, 1); //包编号
p.DataLength = (int)BitConverter.ToInt64(buffer, 9); //内容长度
p.PackageCount = BitConverter.ToInt32(buffer, 13); //分包总数
p.PackageIndex = BitConverter.ToInt32(buffer, 17); //索引
p.IsRequireReceiveCheck = buffer[21] == 1; //是否需要回包
p.Data = new byte[buffer.Length - PackageHeaderLength];
Array.Copy(buffer, PackageHeaderLength, p.Data, 0, p.Data.Length);
return(p);
}
/// <summary>
/// 获得消息包的字节流
/// </summary>
/// <param name="remoteIp">远程主机地址</param>
/// <param name="packageNo">包编号</param>
/// <param name="command">命令</param>
/// <param name="options">参数</param>
/// <param name="userName">用户名</param>
/// <param name="hostName">主机名</param>
/// <param name="content">正文消息</param>
/// <param name="extendContents">扩展消息</param>
/// <returns></returns>
public static PacketNetWorkMsg[] BuildNetworkMessage(IPEndPoint remoteIp, long packageNo, Commands command, string userName, string hostName, Consts type, byte[] content, byte[] extendContents, bool RequireReceiveCheck)
{
//每次发送所能容下的数据量
int maxBytesPerPackage = (int)Consts.MAX_UDP_PACKAGE_LENGTH - PackageHeaderLength;
//压缩数据流
var ms = new MemoryStream();
//var dest = new MemoryStream();
//var zip = new GZipStream(dest, CompressionMode.Compress);
var bw = new BinaryWriter(ms, System.Text.Encoding.Unicode);
//写入头部数据
bw.Write(packageNo); //包编号
bw.Write(userName); //用户名
bw.Write(hostName); //主机名
bw.Write((long)command); //命令
bw.Write((long)type); //数据类型
bw.Write(content == null ? 0 : content.Length); //数据长度
//写入消息数据
if (content != null)
{
bw.Write(content);
}
bw.Write(extendContents == null ? 0 : extendContents.Length);//补充数据长度
if (extendContents != null)
{
bw.Write(extendContents);
}
ms.Flush();
ms.Seek(0, System.IO.SeekOrigin.Begin);
byte[] ibuf = ms.ToArray();
var dest = new System.IO.MemoryStream();
GZipStream zipStream = new GZipStream(dest, CompressionMode.Compress, true);
byte[] buff = new byte[1024];
int offset;
ms.Seek(0, SeekOrigin.Begin);
while ((offset = ms.Read(buff, 0, buff.Length)) > 0)
{
zipStream.Write(buff, 0, offset);//先把数据用二进制写入内存，然后在把它用zip压缩，获取压缩过后的二进制流dest
}
zipStream.Close();
bw.Close();
ms.Close();
dest.Seek(0, SeekOrigin.Begin);
//打包数据总量
int dataLength = (int)dest.Length;
int packageCount = (int)Math.Ceiling(dataLength * 1.0 / maxBytesPerPackage);
PacketNetWorkMsg[] pnma = new PacketNetWorkMsg[packageCount];
for (int i = 0; i < packageCount; i++)
{
int count = i == packageCount - 1 ? dataLength - maxBytesPerPackage * (packageCount - 1) : maxBytesPerPackage;
byte[] buf = new byte[count + PackageHeaderLength];
buf[0] = VersionHeader; //版本号 第1位
BitConverter.GetBytes(packageNo).CopyTo(buf, 1); //消息编号 第2到9位 long类型的整数
BitConverter.GetBytes(dataLength).CopyTo(buf, 9); //消息内容长度 第10到13位 int类型的整数
BitConverter.GetBytes(packageCount).CopyTo(buf, 13); //分包总数 第14位到第17位 int类型的整数
BitConverter.GetBytes(i).CopyTo(buf, 17); //分包编号 第18位到第21位 int类型的整数
buf[21] = RequireReceiveCheck ? (byte)1 : (byte)0; //是否回确认包 第22位
//第23到第31位是保留的(Reserved)
dest.Read(buf, 32, buf.Length - 32); //第32字节以后是,具体的数据包
pnma[i] = new PacketNetWorkMsg()
{
Data = buf,
PackageCount = packageCount,
PackageIndex = i,
PackageNo = packageNo,
RemoteIP = remoteIp,
SendTimes = 0,
Version = 2,
IsRequireReceiveCheck = buf[21] == 1
};
}
return(pnma);
}
