/// <summary>
/// 处理接收的数据
/// 参考 http://www.cnblogs.com/smark/archive/2012/11/26/2789812.html
/// </summary>
public static bool ProcessClientData(byte[] data, int offset, int size, StreamBuffer readState, out int len, out WSOPCode op)
{
len = -1;
op = WSOPCode.Binary;
// 如果有数据则至少包括3位
if (size < 2)
{
return(false);
}
// 判断是否为结束帧
byte value = data[offset];
//如果是1,表示这是消息的最后一个分片,如果是0,表示不是是消息的最后一个分片
bool isEof = (value & 128) != 0;
op = ( WSOPCode )(value & 15);
//if ( op == WSOPCode.Close || op == WSOPCode.Ping || op == WSOPCode.Pong )
// return false;
offset++;
value = data[offset];
// 是否包含掩码
bool hasMask = (value & 128) != 0;
// 获取数据长度
int packageLength = value & 127;
offset++;
// 存储数据
if (packageLength == 126)
{
if (size < offset + 2)
{
return(false);
}
// 等于126 随后的两个字节16位表示数据长度
// 调换字节序
packageLength = 0;
packageLength |= data[1 + offset];
packageLength |= data[0 + offset] << 8;
offset += 2;
}
else if (packageLength == 127)
{
if (size < offset + 8)
{
return(false);
}
// 等于127 随后的八个字节64位表示数据长度
// 调换字节序
packageLength = 0;
packageLength |= data[7 + offset];
packageLength |= data[6 + offset] << 8;
packageLength |= data[5 + offset] << 16;
packageLength |= data[4 + offset] << 24;
packageLength |= data[3 + offset] << 32;
packageLength |= data[2 + offset] << 40;
packageLength |= data[1 + offset] << 48;
packageLength |= data[0 + offset] << 56;
offset += 8;
}
// 存储4位掩码值
byte[] maskingKey = null;
if (hasMask)
{
if (size < offset + 4)
{
return(false);
}
maskingKey = new byte[4];
Buffer.BlockCopy(data, offset, maskingKey, 0, 4);
offset += 4;
}
//判断数据长度是否满足
if (size < offset + packageLength)
{
return(false);
}
//处理掩码
if (maskingKey != null)
{
for (int i = 0; i < packageLength; i++)
{
data[i + offset] = ( byte )(data[i + offset] ^ maskingKey[i % 4]);
}
}
readState.Write(data, offset, packageLength);
len = offset + packageLength;
return(isEof);
}
public static void MakeHeader(StreamBuffer inBuffer, byte[] data, int offset, int size, WSOPCode opCode = WSOPCode.Binary)
{
const int fin = 1, rsv1 = 0, rsv2 = 0, rsv3 = 0;
int op = ( int )opCode;
int ctrlFrame = op | rsv3 << 4 | rsv2 << 5 | rsv1 << 6 | fin << 7;
inBuffer.Write(( byte )ctrlFrame);
//服务端不需要mask
if (size > ushort.MaxValue)
{
inBuffer.Write(( byte )127);
byte[] lengthBytes = (( ulong )size).ToBigEndianBytes();
inBuffer.Write(lengthBytes, 0, lengthBytes.Length);
}
else if (size > 125)
{
inBuffer.Write(( byte )126);
byte[] lengthBytes = (( ushort )size).ToBigEndianBytes();
inBuffer.Write(lengthBytes, 0, lengthBytes.Length);
}
else
{
inBuffer.Write(( byte )size);
}
inBuffer.Write(data, offset, size);
}
