afiqzudinhadi/zmk-steno-engine
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6 commits

Author SHA1 Message Date
afiqzudinhadi
65fde6d298 Own DEFLATE decoder replaces zlib dependency 
Zephyr bundles no zlib — the CONFIG_ZLIB select was a no-op and the
string path returned errors on device. src/inflate.c: minimal raw
DEFLATE (RFC 1951) decompressor, no allocation; one code path for
host and Zephyr. Host round-trip: 42,000 vectors through the real
compiled blobs, 0 mismatches.
 2026-07-03 11:37:19 +08:00
afiqzudinhadi
404cd2a334 Debug bisect toggles: STENO_DEBUG_NO_GATT, STENO_DEBUG_NO_EMBED 2026-07-03 11:02:34 +08:00
afiqzudinhadi
9bf21c9db2 v4 union split-section dictionary: both full dicts, zero trimming 
Format v4 (docs/FORMAT_V4.md): one union CHD MPHF over 226,791 stroke
keys from Plover (147,424) + Lapwing (114,885), sections distributed
across halves. Left blob 387KB (displacements log-class Huffman 59KB,
membership 57KB, fingerprints 113KB, conflicts 9.6KB, value-index
slice 157KB); right blob 515KB (strings front-coded+deflate 193KB,
value-index remainder 324KB, conflicts dup). Shared string table:
73,464 unique translations, Lapwing 93% subset of Plover.

- tools/compile_v4.py: encoder + full verification (all 262,309
  entries byte-exact through cold decode path; hard error if either
  blob exceeds budget — never trims)
- src/dict_v4.c/.h: decoder — canonical Huffman displacement decode,
  conflict binary search, FC block walk, 2-block LRU cache
- src/behavior_steno.c: Plover-style sliding longest-match with
  retrace replaces multi-stroke timeout + prefix checks
- src/split_dict.c/.h: protocol v4 — GET_STRING(string_id) /
  RESOLVE(slot, dict); decisions are 100% left-local, BLE only for
  translation text
- CMake/Kconfig: STENO_DICT_BOTH default, one compiler run emits both
  half blobs; legacy MPHF path kept behind STENO_DICT_V4=n
- Host round-trip test: 42,000 vectors left→right split path,
  0 mismatches (tests/test_dict_v4.c)
 2026-07-03 01:28:31 +08:00
afiqzudinhadi
20218fa2ab True split-dict: partition dictionary across both halves 
Importance-based partitioning — highest-importance entries on left
(central) for zero-latency local lookup, remainder on right
(peripheral) queried over BLE on miss. Both halves embed their own
MPHF binary. Configurable block size for tighter compression.
 2026-07-02 14:27:37 +08:00
afiqzudinhadi
9d2d5e4e2d Fix: generate steno_dict_path.h for dict embed 2026-07-02 09:17:05 +08:00
afiqzudinhadi
2af45eafce Steno engine with BLE split-storage architecture 
Full steno engine: chord detection, MPHF/trie dict lookup, Plover
formatter (18 commands), undo (ring buffer), HID + Unicode output.

Split-storage specific:
- BLE GATT service for dict queries (query/prefix/batch)
- LRU cache on central side (CONFIG_STENO_SPLIT_CACHE_SIZE)
- Dict embedded on peripheral, engine runs on central
- 3-way dispatch: split_dict / MPHF / simple trie

Build system: auto-fetch Plover dict, MPHF compiler with block
compression (~56K entries in 420KB), CMake integration.
 2026-07-02 02:06:37 +08:00