#include "crc.h"
#include <QDebug>
#include "QString"

crc::crc()
{
}

uint8_t crc::crc8(uint8_t *Ptr, uint8_t num)
{

  uint8_t crc = 0;
  uint16_t j, i;

  for (j = 0; j < num; j++)
  {
    crc ^= *(Ptr + j);
    for (i = 0; i < 8; i++)
    {
      if ((crc & 0x01) != 0)
      {
        crc >>= 1;
        crc ^= 0x8c;
      }
      else
      {
        crc >>= 1;
      }
    }
  }
  return crc;
}

void crc::crc16(uint8_t *data, int offset, int len, uint8_t *lb, uint8_t *hb)
{
  if (len > 0)
  {
    uint16_t crc = 0xFFFF;
    int i = offset;
    for (; i < len; i++)
    {
      crc = (uint16_t)(crc ^ (data[i]));
      for (int j = 0; j < 8; j++)
      {
        crc = (crc & 1) != 0 ? (uint16_t)((crc >> 1) ^ 0xA001) : (uint16_t)(crc >> 1);
      }
    }
    uint8_t hi = (uint8_t)((crc & 0xFF00) >> 8); // 高位置
    uint8_t lo = (uint8_t)(crc & 0x00FF);        // 低位置
    *lb = lo;
    *hb = hi;
  }
}

int8_t crc::CheckSumCode(uint8_t CODEMODE, uint8_t *pBuffer, uint16_t Len, uint16_t offset, uint8_t *CHKA, uint8_t *CHKB)
{
  uint16_t i = 0;
  uint8_t _CHKA = 0x00, _CHKB = 0x00;

  for (i = offset; i < Len; i++)
  {
    _CHKA += pBuffer[i];
    _CHKB += _CHKA;
  }
  if (CODEMODE == DECODE)
  {
    if (_CHKA != *CHKA)
      return -1;
    if (_CHKB != *CHKB)
      return -2;
  }
  else
  {
    *CHKA = _CHKA;

    *CHKB = _CHKB;
  }
  return 0;
}

int crc::CheckSumCode(uint8_t CODEMODE, QByteArray pBuffer, uint16_t Len, uint16_t offset, uint8_t *CHKA, uint8_t *CHKB)
{
  uint16_t i = 0;
  uint8_t _CHKA = 0x00, _CHKB = 0x00;

  for (i = offset; i < Len; i++)
  {
    _CHKA += pBuffer[i];
    _CHKB += _CHKA;
  }
  if (CODEMODE == DECODE)
  {
    if (_CHKA != *CHKA)
      return -1;
    if (_CHKB != *CHKB)
      return -2;
  }
  else
  {
    *CHKA = _CHKA;

    *CHKB = _CHKB;
  }
  return 0;
}

QString crc::byte_array_to_string(QByteArray data)
{
  QString ret(data.toHex().toUpper());
  int len = ret.length() / 2;
  for (int i = 1; i < len; i++)
  {
    ret.insert(2 * i + i - 1, " ");
  }

  return ret;
}

// u16转为整形
QString crc::byte_array_to_int_string(QByteArray data)
{
  QString str;
  int len = data.size() / 2;
  for (int i = 0; i < len; i++)
  {
    str.append(QString::number(data[i * 2] | (data[i * 2 + 1] << 8), 10));
    str.append(',');
  }

  return str;
}

uint32_t crc::crc32(const QByteArray &data_buf)
{
  uint32_t temp, crc = 0xFFFFFFFF;
  int i, j;
  i = 0;
  ConverBuf cov;
  if ((data_buf.size() % 4) != 0)
  {
    return 0;
  }
  while (i < data_buf.size())
  {
    cov.c_databuf[0] = data_buf[i++];
    cov.c_databuf[1] = data_buf[i++];
    cov.c_databuf[2] = data_buf[i++];
    cov.c_databuf[3] = data_buf[i++];
    temp = cov.ul_data;
    for (j = 0; j < 32; j++)
    {
      if ((crc ^ temp) & 0x80000000)
      {
        crc = 0x04C11DB7 ^ (crc << 1);
      }
      else
      {
        crc <<= 1;
      }
      temp <<= 1;
    }
    crc &= 0xFFFFFFFF;
  }
  return crc;
}

QString crc::uint8_array_to_string(uint8_t *buf, int len)
{
  QString temp, msg;
  int j = 0;

  while (j < len)
  {
    temp = QString("%1 ").arg((int)buf[j], 2, 16, QLatin1Char('0'));
    msg.append(temp);
    j++;
  }

  return msg;
}