a8000_protocol/api/apibasic/packet_interface.hpp

#pragma once
#include <stdint.h>
#define ZCANCMD_PACKET_MAX_LEN 64

namespace iflytop {
namespace zcr {
#pragma pack(push, 1)
typedef struct {
  uint8_t  packetType;
  uint16_t cmdid;
  uint8_t  moduleId;
  uint8_t  index;
  uint8_t  datalen;
  uint8_t  data[];
  /* int8_t  checksum;*/
} zcr_cmd_header_t;

#pragma pack(pop)

typedef enum {
  kptv2_cmd       = 0xA0,
  kptv2_ack       = 0xA1,
  kptv2_error_ack = 0xA2,
  kptv2_event     = 0xA3,
} zcan_cmd_packet_type_t;

static inline bool zcr_cmd_checkpacket(const zcr_cmd_header_t* header, int len) {
  if (len < sizeof(zcr_cmd_header_t)) {
    return false;
  }
  if ((header->datalen + sizeof(zcr_cmd_header_t) + 1) != len) {
    return false;
  }

  uint8_t* rawpacket = (uint8_t*)header;
  uint8_t  checksum  = 0;
  for (int i = 0; i < len - 1; i++) {
    checksum += rawpacket[i];
  }

  if (checksum != rawpacket[len - 1]) {
    return false;
  }

  return true;
}

}  // namespace zcr
}  // namespace iflytop