Function cmLocalGeneratorShortenObjectName

Source/cmLocalGenerator.cxx:4120–4144

namespace {
bool cmLocalGeneratorShortenObjectName(std::string& objName,
                                       std::string::size_type max_len)
{
  // Check if the path can be shortened using an md5 sum replacement for
  // a portion of the path.
  std::string::size_type md5Len = 32;
  std::string::size_type numExtraChars = objName.size() - max_len + md5Len;
  std::string::size_type pos = objName.find('/', numExtraChars);
  if (pos == std::string::npos) {
    pos = objName.rfind('/', numExtraChars);
    if (pos == std::string::npos || pos <= md5Len) {
      return false;
    }
  }

  // Replace the beginning of the path portion of the object name with
  // its own md5 sum.
  cmCryptoHash md5(cmCryptoHash::AlgoMD5);
  std::string md5name = cmStrCat(md5.HashString(objName.substr(0, pos)),
                                 cm::string_view(objName).substr(pos));
  objName = md5name;

  // The object name is now shorter, check if it is short enough.
  return pos >= numExtraChars;
}

bool cmLocalGeneratorCheckObjectName(std::string& objName,
                                     std::string::size_type dir_len,