Method decodeArray

src/crwimage_int.cpp:681–743

}  // CrwMap::decode0x080a

void CrwMap::decodeArray(const CiffComponent& ciffComponent, const CrwMapping* pCrwMapping, Image& image,
                         ByteOrder byteOrder) {
  if (ciffComponent.typeId() != unsignedShort) {
    return decodeBasic(ciffComponent, pCrwMapping, image, byteOrder);
  }

  int64_t aperture = 0;
  int64_t shutterSpeed = 0;

  IfdId ifdId = IfdId::ifdIdNotSet;
  switch (pCrwMapping->tag_) {
    case 0x0001:
      ifdId = IfdId::canonCsId;
      break;
    case 0x0004:
      ifdId = IfdId::canonSiId;
      break;
    case 0x000f:
      ifdId = IfdId::canonCfId;
      break;
    case 0x0012:
      ifdId = IfdId::canonPiId;
      break;
  }

  std::string groupName(Internal::groupName(ifdId));
  const size_t component_size = ciffComponent.size();
  enforce(component_size % 2 == 0, ErrorCode::kerCorruptedMetadata);
  enforce(component_size / 2 <= static_cast<size_t>(std::numeric_limits<uint16_t>::max()),
          ErrorCode::kerCorruptedMetadata);
  const auto num_components = static_cast<uint16_t>(component_size / 2);
  uint16_t c = 1;
  while (c < num_components) {
    uint16_t n = 1;
    ExifKey key(c, groupName);
    UShortValue value;
    if (ifdId == IfdId::canonCsId && c == 23 && component_size >= 52)
      n = 3;
    value.read(ciffComponent.pData() + c * 2, n * 2, byteOrder);
    image.exifData().add(key, &value);
    if (ifdId == IfdId::canonSiId && c == 21)
      aperture = value.toInt64();
    if (ifdId == IfdId::canonSiId && c == 22)
      shutterSpeed = value.toInt64();
    c += n;
  }

  if (ifdId == IfdId::canonSiId) {
    // Exif.Photo.FNumber
    float f = fnumber(canonEv(aperture));
    auto [r, s] = floatToRationalCast(f);
    auto ur = URational(r, s);
    URationalValue fn;
    fn.value_.push_back(ur);
    image.exifData().add(ExifKey("Exif.Photo.FNumber"), &fn);

    // Exif.Photo.ExposureTime
    ur = exposureTime(canonEv(shutterSpeed));