shared_ptr<ManifestItem> Package::ManifestItemForCFI(ePub3::CFI &cfi, CFI* pRemainingCFI) const
{
ManifestItemPtr result;
// NB: Package is a friend of CFI, so it can access the components directly
if ( cfi._components.size() < 2 )
{
HandleError(EPUBError::CFITooShort, "CFI contains less than 2 nodes, so is invalid for package-based lookups.");
}
// first item directs us to the Spine: check the index against the one we know
auto component = cfi._components[0];
if ( component.nodeIndex != _spineCFIIndex )
{
HandleError(EPUBError::CFIInvalidSpineLocation, _Str("CFI first node index (spine) is ", component.nodeIndex, " but should be ", _spineCFIIndex));
// fix it ?
//component.nodeIndex = _spineCFIIndex;
return nullptr;
}
// second component is the particular spine item
component = cfi._components[1];
if ( !component.IsIndirector() )
{
HandleError(EPUBError::CFIUnexpectedComponent, "Package-based CFI's second item must be an indirector");
return nullptr;
}
try
{
if ( (component.nodeIndex % 2) == 1 )
throw CFI::InvalidCFI("CFI spine item index is odd, which makes no sense for always-empty spine nodes.");
SpineItemPtr item = _spine->at((component.nodeIndex/2) - 1);
// check and correct any qualifiers
item = ConfirmOrCorrectSpineItemQualifier(item, &component);
if ( item == nullptr )
{
HandleError(EPUBError::CFIIndirectionTargetMissing, "CFI spine node qualifier doesn't match any spine item idref");
return nullptr;
}
// we know it's not null, because SpineItem::at() throws an exception if out of range
result = ManifestItemWithID(item->Idref());
if ( pRemainingCFI != nullptr )
pRemainingCFI->Assign(cfi, 2);
}
catch (std::out_of_range& e)
{
HandleError(EPUBError::CFIStepOutOfBounds, _Str("CFI references out-of-range spine item: ", e.what()));
}
return result;
}
const ManifestItem* Package::ManifestItemForCFI(ePub3::CFI &cfi, CFI* pRemainingCFI) const
{
const ManifestItem* result = nullptr;
// NB: Package is a friend of CFI, so it can access the components directly
if ( cfi._components.size() < 2 )
throw CFI::InvalidCFI("CFI contains less than 2 nodes, so is invalid for package-based lookups.");
// first item directs us to the Spine: check the index against the one we know
auto component = cfi._components[0];
if ( component.nodeIndex != _spineCFIIndex )
{
throw CFI::InvalidCFI(_Str("CFI first node index (spine) is ", component.nodeIndex, " but should be ", _spineCFIIndex));
}
// second component is the particular spine item
component = cfi._components[1];
if ( !component.IsIndirector() )
throw CFI::InvalidCFI("Package-based CFI's second item must be an indirector");
try
{
if ( (component.nodeIndex % 2) == 1 )
throw CFI::InvalidCFI("CFI spine item index is odd, which makes no sense for always-empty spine nodes.");
const SpineItem* item = _spine->at(component.nodeIndex/2);
// check and correct any qualifiers
item = ConfirmOrCorrectSpineItemQualifier(item, &component);
if ( item == nullptr )
throw CFI::InvalidCFI("CFI spine node qualifier doesn't match any spine item idref");
// we know it's not null, because SpineItem::at() throws an exception if out of range
result = ManifestItemWithID(item->Idref());
if ( pRemainingCFI != nullptr )
pRemainingCFI->Assign(cfi, 2);
}
catch (std::out_of_range& e)
{
throw CFI::InvalidCFI("CFI references out-of-range spine item");
}
return result;
}
