Getting ready for release 2.21.3

Author: Luke Shaw

ANNOUNCE.md

@@ -1,10 +1,12 @@
-# Announcing C-Blosc2 2.21.2
+# Announcing C-Blosc2 2.21.3
 A fast, compressed and persistent binary data store library for C.
 
 ## What is new?
 
-This is a maintenance release, with a few fixes and some optimizations.
-Thanks to Barak Ugav and Preeyan Parmar for their contributions.
+The main change is an increase in the maximum number of dimensions for
+b2nd arrays from 8 to 16. Otherwise, this is a maintenance release, with a 
+few fixes and some optimizations. Thanks to Barak Ugav and Antonio Valentino 
+for their contributions.
 
 For more info, see the release notes in:
 

RELEASE_NOTES.md

@@ -1,11 +1,18 @@
 Release notes for C-Blosc2
 ==========================
 
-Changes from 2.21.2 to 2.21.3
+Changes from 2.21.3 to 2.21.4
 =============================
 
 #XXX version-specific blurb XXX#
 
+Changes from 2.21.2 to 2.21.3
+=============================
+
+* Increase MAX_DIMS from 8 to 16
+* Fix compatibility with glibc v2.42
+* Bug fix in ``unidim_to_multidim``
+
 Changes from 2.21.1 to 2.21.2
 =============================
 

blosc/schunk.c

@@ -124,12 +124,42 @@ static bool file_exists (char *filename) {
   return (stat (filename, &buffer) == 0);
 }
 
+void schunk_base_incref(blosc2_schunk *schunk)
+{
+  blosc2_schunk *base;
+  if (schunk->base != NULL) {
+     base = schunk->base;
+  }
+  else {
+    base = schunk;
+  }
+  base->refcount += 1;
+}
+
+/* Decrement owner refcount and free owner when reaches zero.
+ * Note: this frees the owner struct itself; callers must ensure they don't access owner afterwards.
+ */
+void schunk_base_decref(blosc2_schunk *schunk)
+{
+  blosc2_schunk *base;
+  if (schunk->base != NULL) {
+    base = schunk->base;
+  }
+  else {
+    base = schunk;
+  }
+  base->refcount -= 1;
+  if (base->refcount <= 0) {
+    blosc2_schunk_free(base); // this frees schunk and will free data if necessary
+  }
+}
 
 /* Create a new super-chunk */
 blosc2_schunk* blosc2_schunk_new(blosc2_storage *storage) {
   blosc2_schunk* schunk = calloc(1, sizeof(blosc2_schunk));
   schunk->version = 0;     /* pre-first version */
   schunk->base = (blosc2_schunk*) NULL;  /* not a view by default, is its own base */
+  schunk->refcount = 1;  /* one reference by default */
 
   // Get the storage with proper defaults
   schunk->storage = get_new_storage(storage, &BLOSC2_CPARAMS_DEFAULTS, &BLOSC2_DPARAMS_DEFAULTS, &BLOSC2_IO_DEFAULTS);
@@ -494,7 +524,7 @@ int64_t blosc2_schunk_append_file(blosc2_schunk* schunk, const char* urlpath) {
 int blosc2_schunk_free(blosc2_schunk *schunk) {
   int err = 0;
 
-  if (schunk->data != NULL && schunk->base != NULL) {
+  if (schunk->data != NULL && schunk->base == NULL) {
     // If not a view (and so base points to true array), free all chunks
     for (int i = 0; i < schunk->nchunks; i++) {
       free(schunk->data[i]);
@@ -540,7 +570,7 @@ int blosc2_schunk_free(blosc2_schunk *schunk) {
     free(schunk->storage);
   }
 
-  if (schunk->frame != NULL && schunk->base != NULL) {
+  if (schunk->frame != NULL && schunk->base == NULL) {
     // If not a view (and so base points to true array), free all chunks
     frame_free((blosc2_frame_s *) schunk->frame);
   }