/// <summary>
/// 截取字节数组
/// </summary>
/// <param name="srcBytes">要截取的字节数组</param>
/// <param name="startIndex">开始截取位置的索引</param>
/// <param name="length">要截取的字节长度</param>
/// <returns>截取后的字节数组</returns>
public static byte[] SubByte(byte[] srcBytes, int startIndex, int length)
{
using (ServerMemoryStream bufferStream = new ServerMemoryStream())
{
byte[] returnByte = new byte[] { };
if (srcBytes == null)
{
return(returnByte);
}
if (startIndex < 0)
{
startIndex = 0;
}
if (startIndex < srcBytes.Length)
{
if (length < 1 || length > srcBytes.Length - startIndex)
{
length = srcBytes.Length - startIndex;
}
bufferStream.Write(srcBytes, startIndex, length);
returnByte = bufferStream.ToArray();
bufferStream.SetLength(0);
bufferStream.Position = 0;
}
return(returnByte);
}
}
/// <summary>
/// 接收数据后的数据封包
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static byte[] SendByte(byte[] data)
{
byte[] retBuffer = null;
//1.如果数据包的长度 大于了m_CompressLen 则进行压缩
bool isCompress = data.Length > m_CompressLen ? true : false;
if (isCompress)
{
data = ZlibHelper.CompressBytes(data);
}
//2.异或
data = SecurityUtil.Xor(data);
//3.Crc校验 压缩后的
ushort crc = Crc16.CalculateCrc16(data);
using (ServerMemoryStream ms = new ServerMemoryStream())
{
ms.WriteUShort((ushort)(data.Length + 3));
ms.WriteBool(isCompress);
ms.WriteUShort(crc);
ms.Write(data, 0, data.Length);
retBuffer = ms.ToArray();
}
return(retBuffer);
}
