#include "embedded_data.h"

#include <vector>

namespace node {

std::string ToOctalString(const uint8_t ch) {

  // We can print most printable characters directly. The exceptions are '\'

  // (escape characters), " (would end the string), and ? (trigraphs). The

  // latter may be overly conservative: we compile with C++17 which doesn't

  // support trigraphs.

  if (ch >= ' ' && ch <= '~' && ch != '\\' && ch != '"' && ch != '?') {

    return std::string(1, static_cast<char>(ch));

  }

  // All other characters are blindly output as octal.

  const char c0 = '0' + ((ch >> 6) & 7);

  const char c1 = '0' + ((ch >> 3) & 7);

  const char c2 = '0' + (ch & 7);

  return std::string("\\") + c0 + c1 + c2;

}

std::vector<std::string> GetOctalTable() {

  size_t size = 1 << 8;

  std::vector<std::string> code_table(size);

  for (size_t i = 0; i < size; ++i) {

    code_table[i] = ToOctalString(static_cast<uint8_t>(i));

  }

  return code_table;

}

const std::string& GetOctalCode(uint8_t index) {

  static std::vector<std::string> table = GetOctalTable();

  return table[index];

}

}  // namespace node