internal DataFrame(byte[] buffer)
{
//帧头
header = new DataFrameHeader(buffer);
//扩展长度
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)
{
int contentLength = (int)extend[0] * 256 + (int)extend[1];
content = new byte[contentLength];
Buffer.BlockCopy(buffer, extend.Length + mask.Length + 2, content, 0, contentLength > 1024 * 100 ? 1024 * 100 : contentLength);
}
else
{
long len = 0;
int n = 1;
for (int i = 7; i >= 0; i--)
{
len += (int)extend[i] * n;
n *= 256;
}
content = new byte[len];
Buffer.BlockCopy(buffer, extend.Length + mask.Length + 2, content, 0, content.Length);
}
if (header.HasMask)
{
content = Mask(content, mask);
}
}
internal DataFrame(string content)
{
this.content = Encoding.UTF8.GetBytes(content);
int length = this.content.Length;
if (length < 126)
{
extend = new byte[0];
header = new DataFrameHeader(true, false, false, false, 1, false, length);
}
else if (length < 65536)
{
extend = new byte[2];
header = new DataFrameHeader(true, false, false, false, 1, false, 126);
extend[0] = (byte)(length / 256);
extend[1] = (byte)(length % 256);
}
else
{
extend = new byte[8];
header = new DataFrameHeader(true, false, false, false, 1, 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;
}
}
}
}
