a883f555ae
This commit enables Blender 4.5 to use (to some extent) blendfiles from Blender 5.0 and later using 'long' ID names (i.e. ID names over 63 bytes). On a more general perspective, it also introduces safer handling of potentially corrupted ID names in a blendfile. This is achieved by carefully checking for non-null terminated ID names early on in readfile process, and then: * Truncating and ensuring uniqueness of ID names. * Doing similar process for action slot and slot users identifiers. * In linking (and appending) context, such IDs are totally ignored. They are not listed, and are considered as missing if some other (valid) linked ID attempt to indirectly link them). * Informing users through usual reporting ways. Technically, this mainly changes two areas of the readfile code related to IDs themselves: * The utils `blo_bhead_id_name` that returns the ID name of an ID BHead, without actually reading that ID, now check for a valid null-terminated string of `MAX_ID_NAME` max size, and returns a `nullptr` on error. _This essentially prevents listing and linking such IDs, in any way._ * The actual ID reading code (`read_id_struct`) does the same check, and truncate the ID name to its maximum allowed length. * Both of above checks also set a new FileData flag (`FD_FLAGS_HAS_LONG_ID_NAME`), which is used to ensure that ID names (and related actions slots identifiers) remain unique, and report to info to the user. Implements #137608. Branched out from !137196. Co-authored-by: michal.krupa <michal.krupa@cdprojektred.com> Co-authored-by: Campbell Barton <ideasman42@gmail.com> Pull Request: https://projects.blender.org/blender/blender/pulls/139336
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