afiqzudinhadi/zmk-steno-engine
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True split-dict: partition dictionary across both halves

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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.
This commit is contained in:
afiqzudinhadi 2026-07-02 11:08:28 +08:00
parent 9d2d5e4e2d
commit 20218fa2ab
7 changed files with 209 additions and 58 deletions
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7
src/dict_mphf.c
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@ -188,6 +188,9 @@ int dict_mphf_init(struct dict_mphf *dict, const void *data, size_t len)
dict->blocks_start = dict->str_data_start;
}
/* Block size from header (0 = legacy default 4096) */
dict->blk_size = hdr->block_size ? hdr->block_size : DICT_MPHF_BLOCK_SIZE;
/* Prefix table at end */
uint32_t prefix_bytes = (uint32_t)hdr->prefix_count * 4;
if (len >= prefix_bytes) {
@ -213,8 +216,8 @@ static const char *resolve_string(const struct dict_mphf *dict, uint32_t val_id)
}
/* Block-compressed: decompress the right block */
uint32_t block_idx = str_offset / DICT_MPHF_BLOCK_SIZE;
uint32_t in_block_off = str_offset % DICT_MPHF_BLOCK_SIZE;
uint32_t block_idx = str_offset / dict->blk_size;
uint32_t in_block_off = str_offset % dict->blk_size;
if (block_idx >= dict->block_count) {
return NULL;