Turns out old system versions just use 16-bit long relstep values in their lower half. The major/minor/micro combination in the upper half remains the same.
Thanks to @liamadvance for clarifying this.
And I don't need anyone to tell me so, thank you very much.
* PoC: remove gc_dumper and nsp_dumper PoC; create nxdt_rw_poc with all gc_dumper and nsp_dumper capabilities + standalone ticket dumping + raw NCA dumping; use ftruncate() to set output file sizes whenever possible. PoC code is a mess, as always. Expect the features from the rest of the PoCs to be implemented into nxdt_rw_poc soon.
* workflow: temporarily disable borealis build generation; comment out manual installation of up-to-date packages from Leseratte's mirrors because the latest devkitA64 Docker image has them all.
* borealis: update to fix building issues with latest devkitA64.
* bfttf: error out on invalid NCA signatures.
* config: save configuration to the current working directory; parse and validate new "gamecard/write_raw_hfs_partition" flag.
* defines: remove CONFIG_PATH macro; rename CONFIG_FILE_NAME.
* gamecard: rename fs_ctx -> hfs_ctx everywhere; use HFS function calls to retrieve partition names.
* hfs: move GameCardHashFileSystemPartitionType enum from gamecard.h and rename it to HashFileSystemPartitionType; add hfsIsValidContext(); add hfsGetPartitionNameString().
* nca/npdm: update comments to reflect latest HOS version.
* nxdt_bfsar: always generate absolute SD card paths with the device name; error out on an invalid NCA signature.
* nxdt_includes: include dirent.h; refactor Version struct to make it a union of all known *Version structs.
* nxdt_log: don't write session separator if the logfile is empty.
* nxdt_utils: log appletIsGamePlayRecordingSupported() errors; add utilsDeleteDirectoryRecursively().
* rsa: provide clearer function descriptions in header file.
* services: handle usb:ds initialization.
* tik: update tikConvertPersonalizedTicketToCommonTicket() to allow NULL input pointers as raw certificate chain arguments (much needed for standalone ticket dumping).
* title: add titleGetApplicationIdByMetaKey().
* usb: refactor interface (de)initialization code; slightly improve ABI usage (console-side only); redefine ABI version field in StartSession command blocks; upgrade ABI to v1.1.
* FatFs: rename DIR -> FDIR to avoid conflicts with definitions from stdlib's dirent.h.
* gamecard_tab: display package ID from the inserted gamecard; fix displayed version numbers from bundled system updates below 3.0.0.
* todo: add notes about creating devoptab devices for HFS/PFS/RomFS file tree dumping.
* Use forward declarations for type definitions wherever suitable (e.g. NcaContext, BucketTreeContext).
* Replace references to "DumpDestination" with "OutputStorage".
* Replace references to "append key area" with "prepend key area".
* Update LZ4 to v1.9.4.
* Update Material Icons font to 2022-08-01.
* RootView: change USB-related icons, reflect how many UMS devices are currently connected to the console, provide a way for child views to retrieve the populated UMS devices vector.
* Tasks: implement GetUmsDevices().
* Update borealis.
* Update libusbhsfs.
* Begin implementation of a DumpOptionsFrame class to display configurable options before starting a new dump process.
* bktr: rename bktrIsValidSubstorage() to bktrIsValidSubStorage(), use bktrIsValidSubStorage() in bktrInitializeCompressedStorageContext(), fixed a bug in bktrReadCompressedStorage() where Sparse substorages wouldn't be allowed.
* GamecardTab: push a DumpOptionsFrame object onto the view stack if the XCI option is clicked.
* Update libusbhsfs.
* Update borealis.
* nsp_dumper: force free size retrieval after dumping an NSP.
* title: add titleGetGameCardApplicationMetadataEntries().
* Makefile: remove -gdwarf-4 flag.
* nxdt_utils: treat NT_MAX_FILENAME_LENGTH as bytes instead of codepoints, add "TiB" to the array of supported size suffixes.
* GameCardTab: add ProcessGameCardStatus() and PopulateList(), manage list updates in the same fashion as TitlesTab, display message about how to mitigate launch errors after exiting the application, display available applications in the inserted gamecard, display message about how to perform individual operations on the gamecard titles.
* main: add a try/catch block to intercept any possible exceptions thrown while the application is running + use brls::Application::crash() to gracefully exit afterwards. Temporarily disable Applet Mode support.
* exception_handler: use LOG_LEVEL_ERROR.
* LayeredErrorFrame: add GetListFirstFocusableChild().
* nxdt_includes: renamed VersionType1 to Version and tweaked it to add the application_version struct, renamed VersionType2 to SdkAddOnVersion.
* gc_dumper: use utilsGeneratePath() to truncate generated filenames to safe filesystem limits. Thanks to n0tw0rk for reporting the issue and testing the changes!
* nxdt_host.py: fixed a string formatting issue that made it impossible to unpack data from the SendFileProperties command block under certain circumstances.
* gamecard: modified GameCardKeySource to add a value field, added GameCardFlags_HasCa10Certificate flag.
* utils: utilsGeneratePath() no longer adds a dot on its own if it's not part of the provided extension string.
Other changes include:
* GameCardTab: moved const strings to gamecard.c for easier maintenance.
* Codebase: reworked tab classes to make them use the wrappers provided by RootView instead of passing task object pointers.
Other changes include:
* Codebase: update all references to FocusableLabel and FocusableTable constructors to match the changes in FocusableItem.
* FocusableTable: objects can now be highlighted, but the highlight background won't be drawn.
* http: set low speed limit and time values.
Other changes include:
* utils: utilsGenerateFormattedSizeString() now takes an input double instead of size_t.
* DownloadTask: calculated speed is now expressed in bytes per second, so now it's up to the caller to convert it to other units.
* DownloadTask: set download size and percentage if the download size isn't known and we're dealing with the final chunk.
* http: slightly improved CURL error info formatting.
* OptionsTab: fully implemented NSWDB XML update option.
* LayeredErrorFrame: both the error frame and the list are now protected instead of private, letting any expanded classes take more control over the them. SetErrorFrameMessage(), AddListView() and the class destructor have been removed because of this change.
* LayeredErrorFrame: removed views vector and simplified the list element focus check carried out before switching to the error frame.
