Function EncodeStringFragment

tensorflow/core/lib/strings/ordered_code.cc:163–188

Helper routine to encode "s" and append to "*dest", escaping special characters.

// Helper routine to encode "s" and append to "*dest", escaping special
// characters.
inline static void EncodeStringFragment(string* dest, StringPiece s) {
  const char* p = s.data();
  const char* limit = p + s.size();
  const char* copy_start = p;
  while (true) {
    p = SkipToNextSpecialByte(p, limit);
    if (p >= limit) break;  // No more special characters that need escaping
    char c = *(p++);
    DCHECK(IsSpecialByte(c));
    if (c == kEscape1) {
      AppendBytes(dest, copy_start, p - copy_start - 1);
      dest->push_back(kEscape1);
      dest->push_back(kNullCharacter);
      copy_start = p;
    } else {
      assert(c == kEscape2);
      AppendBytes(dest, copy_start, p - copy_start - 1);
      dest->push_back(kEscape2);
      dest->push_back(kFFCharacter);
      copy_start = p;
    }
  }
  if (p > copy_start) {
    AppendBytes(dest, copy_start, p - copy_start);
  }
}

void OrderedCode::WriteString(string* dest, StringPiece s) {
  EncodeStringFragment(dest, s);