public void PackData(byte[] data, int datalength, byte[] outdata, out int outlength)
{
var comdata = FileManager.DeflateCompress(data, 0, datalength, out var outlen);
outlength = outlen + 2 + 4;
outdata[0] = (byte)(outlength >> 8);
outdata[1] = (byte)outlength;
Array.Copy(comdata, 0, outdata, 2, outlen);
var adler = Adler32.CalcAdler32(data, datalength);
outdata[outlength - 4] = (byte)(adler >> 24);
outdata[outlength - 3] = (byte)(adler >> 16);
outdata[outlength - 2] = (byte)(adler >> 8);
outdata[outlength - 1] = (byte)adler;
}
public override byte[] ClientPostDecrypt(byte[] plaindata, int datalength, out int outlength)
{
byte[] outdata = new byte[recv_buf_len + datalength * 2 + 16];
Array.Copy(plaindata, 0, recv_buf, recv_buf_len, datalength);
recv_buf_len += datalength;
outlength = 0;
while (recv_buf_len > 2)
{
int len = (recv_buf[0] << 8) + recv_buf[1];
if (len >= 32768 || len < 6)
{
throw new ObfsException("ClientPostDecrypt data error");
}
if (len > recv_buf_len)
{
break;
}
int outlen;
byte[] buf = FileManager.DeflateDecompress(recv_buf, 2, len - 6, out outlen);
if (buf != null)
{
ulong alder = Adler32.CalcAdler32(buf, outlen);
if (recv_buf[len - 4] == (byte)(alder >> 24) &&
recv_buf[len - 3] == (byte)(alder >> 16) &&
recv_buf[len - 2] == (byte)(alder >> 8) &&
recv_buf[len - 1] == (byte)(alder))
{
//pass
}
else
{
throw new ObfsException("ClientPostDecrypt data decompress ERROR");
}
Utils.SetArrayMinSize2(ref outdata, outlength + outlen);
Array.Copy(buf, 0, outdata, outlength, outlen);
outlength += outlen;
recv_buf_len -= len;
Array.Copy(recv_buf, len, recv_buf, 0, recv_buf_len);
len = (recv_buf[0] << 8) + recv_buf[1];
}
else
{
throw new ObfsException("ClientPostDecrypt data decompress ERROR");
}
}
return(outdata);
}