PixelSimulaDisplay/ipc_helper.h at main · to9/PixelSimulaDisplay · GitHub

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#ifndef _IPC_HELPER_H_
#define _IPC_HELPER_H_

#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <sstream>

namespace ipc {

const uint32_t crc32_tab[] = {
    0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
    0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
    0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
    0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
    0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
    0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
    0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
    0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
    0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
    0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
    0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
    0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
    0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
    0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
    0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
    0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d};

static inline uint32_t crc32(const uint8_t* data, uint32_t lenght) {
  if (data == NULL) {
    return 0;
  }

  uint32_t crc = 0;
  for (uint32_t i = 0; i < lenght; i++) {
    crc = crc32_tab[(crc ^ data[i]) & 0xFF] ^ (crc >> 8);
  }
  return crc ^ 0xFFFFFFFF;
}

/*
帧结构示意图：
| 帧头 | 帧编号 | 数据长度 | 数据 | CRC校验 |

1. 帧头字段(4字节)：用于标识帧的起始。固定: 0xAA557d5E
2. 数据长度字段(4字节)：表示数据长度，包括(数据)
3. 帧编号字段(4字节)：用于标识数据传输序号，表示数据在整个数据流中的顺序。无符号0x00 - 0xFFFFFFFF
4. 数据字段(n字节)：实际传输的数据。
5. CRC校验字段(4字节)：计算方式(帧头, 帧编号, 数据长度, 数据)校验值CRC32
6. 一包数据总长度为(帧头(4), 帧编号(4), 数据长度(4), 数据(n), CRC32(4))
*/

enum class FormatErrorCode {
    SUCESS = 0,
    LENGHT_INVALID,
    HEADER_ERROR,
    DATA_LENGHT_ERROR,
    DATA_CRC_ERROR
  };

class BinaryFormat {
 public:
  BinaryFormat(): serialize_sequence_(0) {}

  uint32_t SerializePaddingSize() {
    return 4 + 4 + 4 + 0 + 4;
  }

  FormatErrorCode Serialize(const std::vector<char> &in, std::vector<char> &out) {
    if(in.empty()) {
      return FormatErrorCode::LENGHT_INVALID;
    }

    if (in.size() > 0xffffffff) {
      std::cout<<"data too large !"<<std::endl;
      return FormatErrorCode::DATA_LENGHT_ERROR;
    }

    char temp[3*4] = {0};
    uint32_t offset = 0;

    uint32_t header = 0xAA557d5E;
    memcpy(&temp[offset], &header, sizeof(uint32_t));
    offset += 4;

    memcpy(&temp[offset], &serialize_sequence_, sizeof(uint32_t));
    offset += 4;
    serialize_sequence_++;

    uint32_t length = static_cast<uint32_t>(in.size());
    memcpy(&temp[offset], &length, sizeof(uint32_t));
    offset += 4;

    for (uint32_t i = 0; i < offset; ++i) {
      out.push_back(temp[i]);
    }
    std::copy(in.begin(), in.end(), std::back_inserter(out));

    uint32_t checksum = crc32((const uint8_t*)&out[0], static_cast<uint32_t>(out.size()));
    for (uint32_t i = 0; i < 4; ++i) {
      out.push_back((checksum >> (i * 8)) & 0xff);
    }
    return FormatErrorCode::SUCESS;
  }

  FormatErrorCode Deserialize(const std::vector<char>& data, std::vector<char> &out) {
      if(data.size() < 12) {
        return FormatErrorCode::LENGHT_INVALID;
      }

      uint32_t offset = 0;
      uint32_t header = 0;
      memcpy(&header, &data[offset], sizeof(uint32_t));
      if(header != 0xAA557d5E) {
        return FormatErrorCode::HEADER_ERROR;
      }
      offset += 4;

      uint32_t sequence = 0;
      memcpy(&sequence, &data[offset], sizeof(uint32_t));
      offset += 4;

      uint32_t length = 0;
      memcpy(&length, &data[offset], sizeof(uint32_t));
      if((12 + length + 4) > static_cast<uint32_t>(data.size())) {
        return FormatErrorCode::DATA_LENGHT_ERROR;
      }
      offset += 4;

      uint32_t checksum = 0;
      memcpy(&checksum, &data[offset + length], sizeof(uint32_t));

      uint32_t crc = crc32((const uint8_t*)&data[0], 12 + length);
      if(crc != checksum) {
        std::stringstream ss;
        ss << "crc error:" << std::to_string(checksum) << "," << std::to_string(crc);
        std::cout << ss.str() << std::endl;
        return FormatErrorCode::DATA_CRC_ERROR;
      }

      out.clear();
      for (uint32_t i = 0; i < length; i++) {
        out.push_back(data[i + offset]);
      }
      return FormatErrorCode::SUCESS;
  }

  uint32_t serialize_sequence_;
};

struct IPCParam {
 public:
  IPCParam() : server("127.0.0.1"), port(52110) {}

  IPCParam(const std::string& server_, const int port_) : server(server_), port(port_) {}

  std::string server;
  int port;
};

}  // namespace ipc


#endif  // _IPC_HELPER_H_