Function ToHex

be/src/exprs/expr-test.cc:5857–5868

Convert character array `str` of length `len` to hexadecimal.

/// Convert character array `str` of length `len` to hexadecimal.
std::string ToHex(const unsigned char * str, int len) {
  stringstream ss;
  ss << hex << std::uppercase << setfill('0');
  for (int i = 0; i < len; ++i) {
    // setw is not sticky. stringstream only converts integral values,
    // so a cast to int is required, but only convert the least significant byte to hex.
    ss << setw(2) << (static_cast<int32_t>(str[i]) & 0xFF);
  }
  std::string result = ss.str();
  boost::to_lower(result);
  return result;
}

TEST_P(ExprTest, SHAFunctions) {
  unsigned char input[] = "compute sha digest";