Added a `Size()` method to it and decommissioned redundant
`TagTypeSize()` and `(TagType).Size()`.
- ifd_enumerate.go: Moved `ValueContext` definition to
value_context.go .
- These are absolute representations of where an IFD is positioned with
respect to the other IFDs. There is a more-specific, "fully-qualified"
form of the IFD-path that allows you to express indices in order to
refer to specific siblings.
- Eliminates issues with IFDs at different levels potentially having the
same name (if that's what is required with a certain dataset/
datasource).
- There is a specific IFD registry that controls the heirarchy of IFDs
that we recognize and the tags associated with the child IFDs. This
allows custom hierarchies replacing even the TIFF specification for
which are expected in an image (so we can read other types of images
or any potential IFD hierarchy, even non-image ones).
- IFD and IB instances embed the IFD-path and FQ IFD-path that they were
found or built for.
- We added a trick to overcome the fact that the tag is a slice of longs
rather than bytes (and would usually cause check errors and alignment
problems), but this allows us to use the normal allocation and
decoding flows that are used by normal tags.
- Made things simpler, but we're still mis-encoding the
thumbnail, somehow/somewhere.
- Updated IfdByteEncoder tests to use it instead of hacking-together
their own BT's (makes for more standardized, consistent testing).
- Universally refactored all core IFD knowledge implemented upon a
single IFD name to instead work with IfdIdentity instances, instead,
in order to validate that we only recognize the IFDs only in the
context of the correct parents in the hierarchy.
- Implemented standard testing byte-order (assigned to
TestDefaultByteOrder).
- ifd_builder:
- We now validate that `builderTag` instances are either a byte array
or a child Ifd before allowing to add.
- Renamed `builderTag.valueBytes` to `builderTag.value` (it's not
necessarily bytes).
- `builderTag` now gets the child IFD name if representing a child
IFD.
- Added ability to dump structure to string slice.
- Added NewIfdBuilderFromExistingChain to reconstruct whole chain
from a read IFD chain (collection).
- Wrote IB dumper.
- Added structural tests.
- Moved ifd_tag_entry types to separate file.
- tags_unknown: Unknown-type tags can now satisfy the `UnknownTagValue`
interface to return `[]byte`.
- `IfdTagEntry.ValueBytes` automatically uses this. Else, error if not
`[]byte` or `string`.
- ifd_enumerate
- Now embed `ByteOrder` in `Ifd` (we otherwise require it to be passed
a bit too often).
- Renamed some occurences of "IFD" to "IB" where an actual IB in order
to not be confusing.
Dustin Oprea
Dustin Oprea