WriteMethod ExifParser::encode(
Blob& blob,
const byte* pData,
uint32_t size,
ByteOrder byteOrder,
const ExifData& exifData
)
{
ExifData ed = exifData;
// Delete IFD0 tags that are "not recorded" in compressed images
// Reference: Exif 2.2 specs, 4.6.8 Tag Support Levels, section A
static const char* filteredIfd0Tags[] = {
"Exif.Image.PhotometricInterpretation",
"Exif.Image.StripOffsets",
"Exif.Image.RowsPerStrip",
"Exif.Image.StripByteCounts",
"Exif.Image.JPEGInterchangeFormat",
"Exif.Image.JPEGInterchangeFormatLength",
"Exif.Image.SubIFDs"
};
for (unsigned int i = 0; i < EXV_COUNTOF(filteredIfd0Tags); ++i) {
ExifData::iterator pos = ed.findKey(ExifKey(filteredIfd0Tags[i]));
if (pos != ed.end()) {
#ifdef DEBUG
std::cerr << "Warning: Exif tag " << pos->key() << " not encoded\n";
#endif
ed.erase(pos);
}
}
// Delete IFDs which do not occur in JPEGs
static const IfdId filteredIfds[] = {
subImage1Id,
subImage2Id,
subImage3Id,
subImage4Id,
subImage5Id,
subImage6Id,
subImage7Id,
subImage8Id,
subImage9Id,
subThumb1Id,
panaRawId,
ifd2Id,
ifd3Id
};
for (unsigned int i = 0; i < EXV_COUNTOF(filteredIfds); ++i) {
#ifdef DEBUG
std::cerr << "Warning: Exif IFD " << filteredIfds[i] << " not encoded\n";
#endif
eraseIfd(ed, filteredIfds[i]);
}
// IPTC and XMP are stored elsewhere, not in the Exif APP1 segment.
IptcData emptyIptc;
XmpData emptyXmp;
// Encode and check if the result fits into a JPEG Exif APP1 segment
MemIo mio1;
std::auto_ptr<TiffHeaderBase> header(new TiffHeader(byteOrder, 0x00000008, false));
WriteMethod wm = TiffParserWorker::encode(mio1,
pData,
size,
ed,
emptyIptc,
emptyXmp,
Tag::root,
TiffMapping::findEncoder,
header.get(),
0);
if (mio1.size() <= 65527) {
append(blob, mio1.mmap(), mio1.size());
return wm;
}
// If it doesn't fit, remove additional tags
// Delete preview tags if the preview is larger than 32kB.
// Todo: Enhance preview classes to be able to write and delete previews and use that instead.
// Table must be sorted by preview, the first tag in each group is the size
static const PreviewTags filteredPvTags[] = {
{ pttLen, "Exif.Minolta.ThumbnailLength" },
{ pttTag, "Exif.Minolta.ThumbnailOffset" },
{ pttLen, "Exif.Minolta.Thumbnail" },
{ pttLen, "Exif.NikonPreview.JPEGInterchangeFormatLength" },
{ pttIfd, "NikonPreview" },
{ pttLen, "Exif.Olympus.ThumbnailLength" },
{ pttTag, "Exif.Olympus.ThumbnailOffset" },
{ pttLen, "Exif.Olympus.ThumbnailImage" },
{ pttLen, "Exif.Olympus.Thumbnail" },
{ pttLen, "Exif.Olympus2.ThumbnailLength" },
{ pttTag, "Exif.Olympus2.ThumbnailOffset" },
{ pttLen, "Exif.Olympus2.ThumbnailImage" },
{ pttLen, "Exif.Olympus2.Thumbnail" },
{ pttLen, "Exif.OlympusCs.PreviewImageLength" },
{ pttTag, "Exif.OlympusCs.PreviewImageStart" },
{ pttTag, "Exif.OlympusCs.PreviewImageValid" },
{ pttLen, "Exif.Pentax.PreviewLength" },
{ pttTag, "Exif.Pentax.PreviewOffset" },
{ pttTag, "Exif.Pentax.PreviewResolution" },
{ pttLen, "Exif.PentaxDng.PreviewLength" },
{ pttTag, "Exif.PentaxDng.PreviewOffset" },
{ pttTag, "Exif.PentaxDng.PreviewResolution" },
{ pttLen, "Exif.SamsungPreview.JPEGInterchangeFormatLength" },
{ pttIfd, "SamsungPreview" },
{ pttLen, "Exif.Thumbnail.StripByteCounts" },
{ pttIfd, "Thumbnail" },
{ pttLen, "Exif.Thumbnail.JPEGInterchangeFormatLength" },
{ pttIfd, "Thumbnail" }
};
bool delTags = false;
ExifData::iterator pos;
for (unsigned int i = 0; i < EXV_COUNTOF(filteredPvTags); ++i) {
switch (filteredPvTags[i].ptt_) {
case pttLen:
delTags = false;
pos = ed.findKey(ExifKey(filteredPvTags[i].key_));
if (pos != ed.end() && sumToLong(*pos) > 32768) {
delTags = true;
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Exif tag " << pos->key() << " not encoded\n";
#endif
ed.erase(pos);
}
break;
case pttTag:
if (delTags) {
pos = ed.findKey(ExifKey(filteredPvTags[i].key_));
if (pos != ed.end()) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Exif tag " << pos->key() << " not encoded\n";
#endif
ed.erase(pos);
}
}
break;
case pttIfd:
if (delTags) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Exif IFD " << filteredPvTags[i].key_ << " not encoded\n";
#endif
eraseIfd(ed, Internal::groupId(filteredPvTags[i].key_));
}
break;
}
}
// Delete unknown tags larger than 4kB and known tags larger than 40kB.
for (ExifData::iterator pos = ed.begin(); pos != ed.end(); ) {
if ( (pos->size() > 4096 && pos->tagName().substr(0, 2) == "0x")
|| pos->size() > 40960) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Exif tag " << pos->key() << " not encoded\n";
#endif
pos = ed.erase(pos);
}
else {
++pos;
}
}
// Encode the remaining Exif tags again, don't care if it fits this time
MemIo mio2;
wm = TiffParserWorker::encode(mio2,
pData,
size,
ed,
emptyIptc,
emptyXmp,
Tag::root,
TiffMapping::findEncoder,
header.get(),
0);
append(blob, mio2.mmap(), mio2.size());
#ifdef DEBUG
if (wm == wmIntrusive) {
std::cerr << "SIZE OF EXIF DATA IS " << std::dec << mio2.size() << " BYTES\n";
}
else {
std::cerr << "SIZE DOESN'T MATTER, NON-INTRUSIVE WRITING USED\n";
}
#endif
return wm;
} // ExifParser::encode
void Rw2Image::readMetadata()
{
#ifdef DEBUG
std::cerr << "Reading RW2 file " << io_->path() << "\n";
#endif
if (io_->open() != 0) {
throw Error(9, io_->path(), strError());
}
IoCloser closer(*io_);
// Ensure that this is the correct image type
if (!isRw2Type(*io_, false)) {
if (io_->error() || io_->eof()) throw Error(14);
throw Error(3, "RW2");
}
clearMetadata();
std::ofstream devnull;
printStructure(devnull, kpsRecursive, 0);
ByteOrder bo = Rw2Parser::decode(exifData_,
iptcData_,
xmpData_,
io_->mmap(),
io_->size());
setByteOrder(bo);
// A lot more metadata is hidden in the embedded preview image
// Todo: This should go into the Rw2Parser, but for that it needs the Image
PreviewManager loader(*this);
PreviewPropertiesList list = loader.getPreviewProperties();
// Todo: What if there are more preview images?
if (list.size() > 1) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "RW2 image contains more than one preview. None used.\n";
#endif
}
if (list.size() != 1) return;
ExifData exifData;
PreviewImage preview = loader.getPreviewImage(*list.begin());
Image::AutoPtr image = ImageFactory::open(preview.pData(), preview.size());
if (image.get() == 0) {
#ifndef SUPPRESS_WARNINGS
EXV_WARNING << "Failed to open RW2 preview image.\n";
#endif
return;
}
image->readMetadata();
ExifData& prevData = image->exifData();
if (!prevData.empty()) {
// Filter duplicate tags
for (ExifData::const_iterator pos = exifData_.begin(); pos != exifData_.end(); ++pos) {
if (pos->ifdId() == panaRawId) continue;
ExifData::iterator dup = prevData.findKey(ExifKey(pos->key()));
if (dup != prevData.end()) {
#ifdef DEBUG
std::cerr << "Filtering duplicate tag " << pos->key()
<< " (values '" << pos->value()
<< "' and '" << dup->value() << "')\n";
#endif
prevData.erase(dup);
}
}
}
// Remove tags not applicable for raw images
static const char* filteredTags[] = {
"Exif.Photo.ComponentsConfiguration",
"Exif.Photo.CompressedBitsPerPixel",
"Exif.Panasonic.ColorEffect",
"Exif.Panasonic.Contrast",
"Exif.Panasonic.NoiseReduction",
"Exif.Panasonic.ColorMode",
"Exif.Panasonic.OpticalZoomMode",
"Exif.Panasonic.Contrast",
"Exif.Panasonic.Saturation",
"Exif.Panasonic.Sharpness",
"Exif.Panasonic.FilmMode",
"Exif.Panasonic.SceneMode",
"Exif.Panasonic.WBRedLevel",
"Exif.Panasonic.WBGreenLevel",
"Exif.Panasonic.WBBlueLevel",
"Exif.Photo.ColorSpace",
"Exif.Photo.PixelXDimension",
"Exif.Photo.PixelYDimension",
"Exif.Photo.SceneType",
"Exif.Photo.CustomRendered",
"Exif.Photo.DigitalZoomRatio",
"Exif.Photo.SceneCaptureType",
"Exif.Photo.GainControl",
"Exif.Photo.Contrast",
"Exif.Photo.Saturation",
"Exif.Photo.Sharpness",
"Exif.Image.PrintImageMatching",
"Exif.Image.YCbCrPositioning"
};
for (unsigned int i = 0; i < EXV_COUNTOF(filteredTags); ++i) {
ExifData::iterator pos = prevData.findKey(ExifKey(filteredTags[i]));
if (pos != prevData.end()) {
#ifdef DEBUG
std::cerr << "Exif tag " << pos->key() << " removed\n";
#endif
prevData.erase(pos);
}
}
// Add the remaining tags
for (ExifData::const_iterator pos = prevData.begin(); pos != prevData.end(); ++pos) {
exifData_.add(*pos);
}
} // Rw2Image::readMetadata
