void CrwMap::extract0x102a(const CiffComponent& ciffComponent,
const CrwMapInfo* crwMapInfo,
Image& image,
ByteOrder byteOrder)
{
if (ciffComponent.typeId() != unsignedShort) {
return extractBasic(ciffComponent, crwMapInfo, image, byteOrder);
}
long aperture = 0;
long shutterSpeed = 0;
std::string ifdItem(ExifTags::ifdItem(canonCs2IfdId));
uint16_t c = 1;
while (uint32_t(c)*2 < ciffComponent.size()) {
uint16_t n = 1;
ExifKey key(c, ifdItem);
UShortValue value;
value.read(ciffComponent.pData() + c*2, n*2, byteOrder);
image.exifData().add(key, &value);
if (c == 21) aperture = value.toLong();
if (c == 22) shutterSpeed = value.toLong();
c += n;
}
// Exif.Photo.FNumber
float f = fnumber(canonEv(aperture));
// Beware: primitive conversion algorithm
uint32_t den = 1000000;
uint32_t nom = static_cast<uint32_t>(f * den);
uint32_t g = gcd(nom, den);
URational ur(nom/g, den/g);
URationalValue fn;
fn.value_.push_back(ur);
image.exifData().add(ExifKey("Exif.Photo.FNumber"), &fn);
// Exif.Photo.ExposureTime
ur = exposureTime(canonEv(shutterSpeed));
URationalValue et;
et.value_.push_back(ur);
image.exifData().add(ExifKey("Exif.Photo.ExposureTime"), &et);
} // CrwMap::extract0x102a
void CrwMap::extract0x102d(const CiffComponent& ciffComponent,
const CrwMapInfo* crwMapInfo,
Image& image,
ByteOrder byteOrder)
{
if (ciffComponent.typeId() != unsignedShort) {
return extractBasic(ciffComponent, crwMapInfo, image, byteOrder);
}
std::string ifdItem(ExifTags::ifdItem(canonCs1IfdId));
uint16_t c = 1;
while (uint32_t(c)*2 < ciffComponent.size()) {
uint16_t n = 1;
ExifKey key(c, ifdItem);
UShortValue value;
if (c == 23 && ciffComponent.size() > 50) n = 3;
value.read(ciffComponent.pData() + c*2, n*2, byteOrder);
image.exifData().add(key, &value);
c += n;
}
} // CrwMap::extract0x102d
std::string ExifTags::makeKey(uint16 tag, IfdId ifdId)
{
return std::string(ifdItem(ifdId))
+ "." + std::string(sectionName(tag, ifdId))
+ "." + std::string(tagName(tag, ifdId));
}
/*!
@brief Return the name of the group (the second part of the key).
For Exif keys, the group name is the IFD item.
*/
virtual std::string groupName() const { return ifdItem(); }
