lyb UPDATE store hash algorithm used

Author: michalvasko

src/lyb.h

@@ -3,7 +3,7 @@
  * @author Michal Vasko <[email protected]>
  * @brief Header for LYB format printer & parser
  *
- * Copyright (c) 2020 - 2022 CESNET, z.s.p.o.
+ * Copyright (c) 2020 - 2025 CESNET, z.s.p.o.
  *
  * This source code is licensed under BSD 3-Clause License (the "License").
  * You may not use this file except in compliance with the License.
@@ -111,10 +111,20 @@ void lyd_lyb_ctx_free(struct lyd_ctx *lydctx);
 #define LYB_SIBLING_STEP 4
 
 /* current LYB format version */
-#define LYB_VERSION_NUM 0x05
+#define LYB_HEADER_VERSION_NUM 0x06
 
 /* LYB format version mask of the header byte */
-#define LYB_VERSION_MASK 0x0F
+#define LYB_HEADER_VERSION_MASK 0x0F
+
+/* current LYB hash function */
+#ifdef LY_XXHASH_SUPPORT
+# define LYB_HEADER_HASH_ALG 0x20  /**< xxhash */
+#else
+# define LYB_HEADER_HASH_ALG 0x10  /**< one-at-a-time hash */
+#endif
+
+/* LYB hash algorithm mask of the header byte */
+#define LYB_HEADER_HASH_MASK 0x30
 
 /**
  * LYB schema hash constants

src/parser_lyb.c

@@ -1657,12 +1657,18 @@ lyb_parse_header(struct lylyb_ctx *lybctx)
 {
     uint8_t byte = 0;
 
-    /* version, future flags */
+    /* version, hash algorithm (flags) */
     lyb_read((uint8_t *)&byte, sizeof byte, lybctx);
 
-    if ((byte & LYB_VERSION_MASK) != LYB_VERSION_NUM) {
+    if ((byte & LYB_HEADER_VERSION_MASK) != LYB_HEADER_VERSION_NUM) {
         LOGERR(lybctx->ctx, LY_EINVAL, "Invalid LYB format version \"0x%02x\", expected \"0x%02x\".",
-                byte & LYB_VERSION_MASK, LYB_VERSION_NUM);
+                byte & LYB_HEADER_VERSION_MASK, LYB_HEADER_VERSION_NUM);
+        return LY_EINVAL;
+    }
+
+    if ((byte & LYB_HEADER_HASH_MASK) != LYB_HEADER_HASH_ALG) {
+        LOGERR(lybctx->ctx, LY_EINVAL, "Different LYB format hash algorithm \"0x%02x\" used, expected \"0x%02x\".",
+                byte & LYB_HEADER_HASH_MASK, LYB_HEADER_HASH_ALG);
         return LY_EINVAL;
     }
 

src/printer_lyb.c

@@ -611,8 +611,9 @@ lyb_print_header(struct ly_out *out)
 {
     uint8_t byte = 0;
 
-    /* version, future flags */
-    byte |= LYB_VERSION_NUM;
+    /* version, hash algorithm (flags) */
+    byte |= LYB_HEADER_VERSION_NUM;
+    byte |= LYB_HEADER_HASH_ALG;
 
     LY_CHECK_RET(ly_write_(out, (char *)&byte, 1));