Use zstd dictionaries.

[plocate] / db.h

diff --git a/db.h b/db.h
index ca8b3ea74ae513a16a6bb9ed42a4eccdd9ea40a0..df79904d94594753bf960538e0f006d82b614437 100644 (file)
--- a/db.h
+++ b/db.h
@@ -5,12 +5,17 @@
 
 struct Header {
        char magic[8];  // "\0plocate";
-       uint32_t version;  // 0.
+       uint32_t version;  // 1.
        uint32_t hashtable_size;
        uint32_t extra_ht_slots;
        uint32_t num_docids;
        uint64_t hash_table_offset_bytes;
        uint64_t filename_index_offset_bytes;
+
+       // Version 1 and up only.
+       uint32_t max_version;  // Nominally 1, but can be increased if more features are added in a backward-compatible way.
+       uint32_t zstd_dictionary_length_bytes;
+       uint64_t zstd_dictionary_offset_bytes;
 };
 
 struct Trigram {