void TiffParser::decode(Image* pImage,
const byte* pData,
uint32_t size,
TiffCompFactoryFct createFct,
FindDecoderFct findDecoderFct,
TiffHeaderBase* pHeader)
{
assert(pImage != 0);
assert(pData != 0);
std::auto_ptr<TiffHeaderBase> ph;
if (!pHeader) {
ph = std::auto_ptr<TiffHeaderBase>(new TiffHeade2);
pHeader = ph.get();
}
if (!pHeader->read(pData, size) || pHeader->offset() >= size) {
throw Error(3, "TIFF");
}
TiffComponent::AutoPtr rootDir = createFct(Tag::root, Group::none);
if (0 == rootDir.get()) return;
rootDir->setStart(pData + pHeader->offset());
TiffRwState::AutoPtr state(
new TiffRwState(pHeader->byteOrder(), 0, createFct));
TiffReader reader(pData, size, rootDir.get(), state);
rootDir->accept(reader);
TiffMetadataDecoder decoder(pImage, rootDir.get(), findDecoderFct, 4096);
rootDir->accept(decoder);
} // TiffParser::decode
ByteOrder TiffParserWorker::decode(
ExifData& exifData,
IptcData& iptcData,
XmpData& xmpData,
const byte* pData,
uint32_t size,
TiffCompFactoryFct createFct,
FindDecoderFct findDecoderFct,
TiffHeaderBase* pHeader
)
{
// Create standard TIFF header if necessary
std::auto_ptr<TiffHeaderBase> ph;
if (!pHeader) {
ph = std::auto_ptr<TiffHeaderBase>(new TiffHeader);
pHeader = ph.get();
}
TiffComponent::AutoPtr rootDir = parse(pData, size, createFct, pHeader);
if (0 != rootDir.get()) {
TiffDecoder decoder(exifData,
iptcData,
xmpData,
rootDir.get(),
findDecoderFct);
rootDir->accept(decoder);
}
return pHeader->byteOrder();
} // TiffParserWorker::decode
TiffComponent::AutoPtr TiffParserWorker::parse(
const byte* pData,
uint32_t size,
TiffCompFactoryFct createFct,
TiffHeaderBase* pHeader
)
{
if (pData == 0 || size == 0) return TiffComponent::AutoPtr(0);
if (!pHeader->read(pData, size) || pHeader->offset() >= size) {
throw Error(3, "TIFF");
}
TiffComponent::AutoPtr rootDir = createFct(Tag::root, Group::none);
if (0 != rootDir.get()) {
rootDir->setStart(pData + pHeader->offset());
TiffRwState::AutoPtr state(
new TiffRwState(pHeader->byteOrder(), 0, createFct));
TiffReader reader(pData, size, rootDir.get(), state);
rootDir->accept(reader);
}
return rootDir;
} // TiffParserWorker::parse
WriteMethod TiffParserWorker::encode(
Blob& blob,
const byte* pData,
uint32_t size,
const ExifData& exifData,
const IptcData& iptcData,
const XmpData& xmpData,
TiffCompFactoryFct createFct,
FindEncoderFct findEncoderFct,
TiffHeaderBase* pHeader
)
{
/*
1) parse the binary image, if one is provided, and
2) attempt updating the parsed tree in-place ("non-intrusive writing")
3) else, create a new tree and write a new TIFF structure ("intrusive
writing"). If there is a parsed tree, it is only used to access the
image data in this case.
*/
assert(pHeader);
assert(pHeader->byteOrder() != invalidByteOrder);
blob.clear();
WriteMethod writeMethod = wmIntrusive;
TiffComponent::AutoPtr createdTree;
TiffComponent::AutoPtr parsedTree = parse(pData, size, createFct, pHeader);
if (0 != parsedTree.get()) {
// Attempt to update existing TIFF components based on metadata entries
TiffEncoder encoder(exifData,
iptcData,
xmpData,
parsedTree.get(),
pHeader->byteOrder(),
findEncoderFct);
parsedTree->accept(encoder);
if (!encoder.dirty()) writeMethod = wmNonIntrusive;
}
if (writeMethod == wmIntrusive) {
createdTree = createFct(Tag::root, Group::none);
TiffEncoder encoder(exifData,
iptcData,
xmpData,
createdTree.get(),
pHeader->byteOrder(),
findEncoderFct);
// Add entries from metadata to composite
encoder.add(createdTree.get(), parsedTree.get(), createFct);
// Write binary representation from the composite tree
uint32_t offset = pHeader->write(blob);
uint32_t imageIdx(uint32_t(-1));
uint32_t len = createdTree->write(blob, pHeader->byteOrder(), offset, uint32_t(-1), uint32_t(-1), imageIdx);
// Avoid writing just the header if there is no IFD data
if (len == 0) blob.clear();
#ifdef DEBUG
std::cerr << "Intrusive writing\n";
#endif
}
#ifdef DEBUG
else {
std::cerr << "Non-intrusive writing\n";
}
#endif
return writeMethod;
} // TiffParserWorker::encode