#include "codec_m4.h"
#include "QDebug"

bool codec_m4::recvByte(int byte)
{
  bool ack = false;
  if (fullFrame == true)
  {
    return fullFrame;
  }
  data.append(byte);
  switch (data.size())
  {
  case 1:
    if (uint8_t(data[0]) == 0xff)
    {
      num_to_read = 2;
    }
    else
    {
      data.remove(0, 1);
      num_to_read = 0;
    }
    break;
  case 2:
  {
    int len = data[1];
    num_to_read = len + 2;
  }
  break;
  default:
    break;
  }
  // 此时一帧数据已完成
  if (num_to_read > 0 && num_to_read == data.size())
  {
    data.remove(0, 2);
    qDebug() << "recv_m4:" << QString(data) << endl;
    ack = true;
    num_to_read = 0;
  }
  fullFrame = ack;
  return fullFrame;
}

int codec_m4::packCheck(myarray data)
{
  if (data[0] != 0xff)
  {
    return 0;
  }
  if (data.size() >= 2 && (data.size() >= (data[1] + 2)))
  {
    return data[1] + 2;
  }
  return 0;
}

myarray codec_m4::encode(int srcAddr, int dstAddr, int cmd, myarray data)
{
  myarray r;
  r.append(0xff);
  r.append(char(data.size()));
  r.append(data);
  return r;
}
myarray codec_m4::decode(int &srcAddr, int &dstAddr, int &cmd, myarray data)
{
//  qDebug("m4 recv:%s",data.toHex(' ').data());
  if (packCheck(data))
  {
    return data.mid(2,data[1]);
  }
  return myarray();
}

Codec *codec_get()
{
  static Codec *codec_ = nullptr;
  if (codec_ == nullptr)
  {
    codec_ = new codec_m4();
  }
  return codec_;
}

codec_export(codec_m4, codec_get);