Function WriteTextString

src/pdf/PDFUnion.cpp:99–145

}

void WriteTextString(const std::shared_ptr<WriteStream>& stream, const char* data, size_t length) {
  bool inputIsValidUTF8 = true;
  bool inputIsPDFDocEncoding = true;
  size_t literalExtras = 0;
  {
    const char* textStart = data;
    const char* textEnd = data + length;
    while (textStart < textEnd) {
      Unichar unichar = UTF::NextUTF8(&textStart, textEnd);
      if (unichar < 0) {
        inputIsValidUTF8 = false;
        break;
      }
      // See Table D.2 (PDFDocEncoding Character Set) in the PDF3200_2008 spec.
      // Could convert from UTF-8 to PDFDocEncoding and, if successful, use that.
      if ((0x15 < unichar && unichar < 0x20) || 0x7E < unichar) {
        inputIsPDFDocEncoding = false;
        break;
      }
      if (unichar < ' ' || '~' < unichar) {
        literalExtras += 3;
      } else if (unichar == '\\' || unichar == '(' || unichar == ')') {
        ++literalExtras;
      }
    }
  }

  if (!inputIsValidUTF8) {
    LOGE("Invalid UTF8: %.*s\n", (int)length, data);
    stream->writeText("<>");
    return;
  }

  if (inputIsPDFDocEncoding) {
    WriteOptimizedByteString(stream, data, length, literalExtras);
    return;
  }

  stream->writeText("<FEFF");
  const char* textPtr = data;
  const char* textEnd = data + length;
  while (textPtr < textEnd) {
    Unichar unichar = UTF::NextUTF8(&textPtr, textEnd);
    PDFUtils::WriteUTF16beHex(stream, unichar);
  }
  stream->writeText(">");
}
}  // namespace

PDFUnion::PDFUnion(Type type, int32_t value) : intValue(value), type(type) {