/// <summary>
/// 构造函数
/// </summary>
/// <remarks>主要用于发送封装数据</remarks>
public DataFrame(string content)
{
_content = Encoding.UTF8.GetBytes(content);
int length = _content.Length;
if (length < 126)
{
_extend = new byte[0];
_header = new DataFrameHeader(true, false, false, false, OpCode.Text, false, length);
}
else if (length < 65536)
{
_extend = new byte[2];
_header = new DataFrameHeader(true, false, false, false, OpCode.Text, false, 126);
_extend[0] = (byte)(length / 256);
_extend[1] = (byte)(length % 256);
}
else
{
_extend = new byte[8];
_header = new DataFrameHeader(true, false, false, false, OpCode.Text, false, 127);
int left = length;
int unit = 256;
for (int i = 7; i > 1; i--)
{
_extend[i] = (byte)(left % unit);
left = left / unit;
if (left == 0)
break;
}
}
}
/// <summary>
/// 构造函数
/// </summary>
/// <remarks>主要用于解析接收数据</remarks>
public DataFrame(byte[] buffer)
{
//格式化帧头
_header = new DataFrameHeader(buffer);
//填充扩展长度字节
if (_header.Length == 126)
{
_extend = new byte[2];
Buffer.BlockCopy(buffer, 2, _extend, 0, 2);
}
else if (_header.Length == 127)
{
_extend = new byte[8];
Buffer.BlockCopy(buffer, 2, _extend, 0, 8);
}
//是否有掩码
if (_header.HasMask)
{
_mask = new byte[4];
Buffer.BlockCopy(buffer, _extend.Length + 2, _mask, 0, 4);
}
//消息体
if (_extend.Length == 0)
{
_content = new byte[_header.Length];
Buffer.BlockCopy(buffer, _extend.Length + _mask.Length + 2 , _content, 0, _content.Length);
}
else if (_extend.Length == 2)
{
_content = new byte[Convert.ToUInt16(_extend)];
Buffer.BlockCopy(buffer, _extend.Length + _mask.Length + 2, _content, 0, _content.Length);
}
else
{
_content = new byte[Convert.ToUInt64(Common.CopyArrayData(buffer, 2, 8))];
Buffer.BlockCopy(buffer, _extend.Length + _mask.Length + 2, _content, 0, _content.Length);
}
//如果有掩码，则需要还原原始数据
if (_header.HasMask) _content = Mask(_content, _mask);
}