utils.hpp

См. документацию.

#include <eosio/eosio.hpp>
#include <eosio/transaction.hpp>
#include <eosio/crypto.hpp>
 
static uint128_t combine_ids(const uint64_t &x, const uint64_t &y) {
  return (uint128_t{x} << 64) | y;
};
 
static uint128_t combine_checksum_ids(const checksum256 &hash, eosio::name username) {
    auto hash_bytes = hash.extract_as_byte_array();
    uint64_t truncated_hash = *reinterpret_cast<const uint64_t*>(hash_bytes.data()); // Берем первые 8 байт
    return combine_ids(truncated_hash, username.value);
}
 
 
std::string generate_random_name() {
  const char ALPHABET[] = "abcdefghijklmnopqrstuvwxyz";
  const int ALPHABET_SIZE = sizeof(ALPHABET) - 1;
  const int NAME_LENGTH = 12;
 
  uint64_t current_time =
      eosio::current_time_point().sec_since_epoch(); // Получаем текущее время
  std::string random_name;
 
  for (int i = 0; i < NAME_LENGTH; ++i) {
    current_time = (current_time * 1103515245 + 12345) %
                   0x100000000; // Линейный конгруэнтный метод
    int random_index = (current_time % ALPHABET_SIZE);
    random_name += ALPHABET[random_index];
  }
 
  return random_name;
}
 
eosio::checksum256 hashit(std::string str) {
  return eosio::sha256(const_cast<char *>(str.c_str()), str.size());
}
 
uint64_t hash64(const char *buf, size_t len) {
  eosio::checksum256 hash = eosio::sha256(buf, len);
  return *(reinterpret_cast<const uint64_t *>(&hash));
}
 
uint64_t hash64(const std::string &arg) {
  return hash64(arg.c_str(), arg.size());
}
 
uint64_t generate() {
    auto size = eosio::transaction_size();
    char buf[size];
    uint32_t read = eosio::read_transaction(buf, size);
    eosio::check(size == read, "read_transaction failed");
 
    uint64_t seed = eosio::current_time_point().sec_since_epoch();
    for (int i = 0; i < size; i++) {
        seed ^= ((uint64_t)buf[i] << (i % 8));
    }
 
    return seed;
}
 
std::string checksum256_to_hex(const eosio::checksum256& hash) {
    auto hash_bytes = hash.extract_as_byte_array();
    std::string hash_hex;
    for (const auto& byte : hash_bytes) {
        char hex_char[3];
        sprintf(hex_char, "%02x", byte);
        hash_hex += hex_char;
    }
    return hash_hex;
}
 
uint64_t extract_registry_id_from_meta(const std::string& meta_json) {
    // Ищем "registry_id": и извлекаем число после двоеточия
    std::string search_key = "\"registry_id\":";
    size_t pos = meta_json.find(search_key);
    
    eosio::check(pos != std::string::npos, "registry_id not found in meta");
    
    // Перемещаемся после двоеточия
    pos += search_key.length();
    
    // Ищем первую цифру
    while (pos < meta_json.length() && (meta_json[pos] < '0' || meta_json[pos] > '9')) {
        pos++;
    }
    
    eosio::check(pos < meta_json.length(), "registry_id value not found");
    
    // Собираем цифры
    uint64_t result = 0;
    while (pos < meta_json.length() && meta_json[pos] >= '0' && meta_json[pos] <= '9') {
        result = result * 10 + (meta_json[pos] - '0');
        pos++;
    }
    
    eosio::check(result > 0, "invalid registry_id value");
    
    return result;
}