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.
* title: implemented titleGetNcmStorageIdName().
* nxdt_log: implemented log verbosity levels (debug, info, warning, error, none) and helper macros for each level. The rest of the codebase still needs to be updated to take advantange of this change.
* nxdt_log: implemented auxiliary logging via nxlink, if available.
* nxdt_utils: system CPU/MEM overclocking is now only applied through utilsSetLongRunningProcessState(), as it should have been from the beginning.
* nxdt_utils: nxlink initialization is now carried out without redirecting stdout and/or stderr, entirely removing the need for utilsRestoreConsoleOutput(). utilsGetNxLinkFileDescriptor() is used to send data to the nxlink host via dprintf() in log functions.
* 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:
* Updated borealis.
* Updated Makefile.
* Began implementation of a (very) simple, CURL-based HTTP handler.
* OptionsTab: added a small disclaimer about dump options.
* OptionsTab: added notifications for the update application item (running as NSO, app already updated).
* config: improved boundary handling while validating integer entries.
* utils: (de)initialize CURL (this will be moved to http.c eventually).
* Thread-safe.
* Provides getter/setter functions for the data types used by nxdumptool's configuration.
* Each setter function writes the modified JSON configuration back to the SD card.
* Configuration is validated on interface initialization. If validation fails, a default JSON template is loaded from the application's RomFS and written back to the SD card.
Other changes:
* Implement directory creation.
* Moved more preprocessor definitions to defines.h.
* Replaced strtok() calls throughout the code with strtok_r() to guarantee thread-safety.