When creating new arrays, infer chunksize from schunk

blosc/b2nd.c

@@ -233,6 +233,9 @@ int array_new(b2nd_context_t *ctx, int special_value, b2nd_array_t **array) {
     BLOSC_TRACE_ERROR("Pointer is NULL");
     return BLOSC2_ERROR_FAILURE;
   }
+  // Set the chunksize for the schunk, as it cannot be derived from storage
+  int32_t chunksize = (int32_t) (*array)->extchunknitems * sc->typesize;
+  sc->chunksize = chunksize;
 
   // Serialize the dimension info
   if (sc->nmetalayers >= BLOSC2_MAX_METALAYERS) {
@@ -274,7 +277,6 @@ int array_new(b2nd_context_t *ctx, int special_value, b2nd_array_t **array) {
   }
   // Fill schunk with uninit values
   if ((*array)->nitems != 0) {
-    int32_t chunksize = (int32_t) (*array)->extchunknitems * sc->typesize;
     int64_t nchunks = (*array)->extnitems / (*array)->chunknitems;
     int64_t nitems = nchunks * (*array)->extchunknitems;
     // blosc2_schunk_fill_special(sc, nitems, BLOSC2_SPECIAL_ZERO, chunksize);
@@ -621,8 +623,6 @@ int get_set_slice(void *buffer, int64_t buffersize, const int64_t *start, const
     }
 
     int32_t nblocks = (int32_t) array->extchunknitems / array->blocknitems;
-
-
     if (set_slice) {
       // Check if all the chunk is going to be updated and avoid the decompression
       bool decompress_chunk = false;
@@ -1223,8 +1223,8 @@ int extend_shape(b2nd_array_t *array, const int64_t *new_shape, const int64_t *s
       BLOSC_TRACE_ERROR("The new shape must be greater than the old one");
       BLOSC_ERROR(BLOSC2_ERROR_INVALID_PARAM);
     }
-    if (array->shape[i] == 0) {
-      BLOSC_TRACE_ERROR("Cannot extend array with shape[%d] = 0", i);
+    if (array->shape[i] == INT64_MAX) {
+      BLOSC_TRACE_ERROR("Cannot extend array with shape[%d] = %lld", i, INT64_MAX);
       BLOSC_ERROR(BLOSC2_ERROR_INVALID_PARAM);
     }
   }

include/b2nd.h

@@ -131,7 +131,7 @@ typedef struct {
  * @param chunkshape The chunk shape.
  * @param blockshape The block shape.
  * @param dtype The data type expressed as a string version.
- * @param dtype_format The data type format; default is DTYPE_NUMPY_FORMAT.
+ * @param dtype_format The data type format; DTYPE_NUMPY_FORMAT should be chosen for NumPy compatibility.
  * @param metalayers The memory pointer to the list of the metalayers desired.
  * @param nmetalayers The number of metalayers.
  *
@@ -364,10 +364,10 @@ BLOSC_EXPORT int b2nd_get_slice_cbuffer(const b2nd_array_t *array, const int64_t
  * @brief Set a slice in a b2nd array using a C buffer.
  *
  * @param buffer The buffer where the slice data is.
+ * @param buffershape The shape of the buffer.
  * @param buffersize The size (in bytes) of the buffer.
  * @param start The coordinates where the slice will begin.
  * @param stop The coordinates where the slice will end.
- * @param buffershape The shape of the buffer.
  * @param array The b2nd array where the slice will be set
  *
  * @return An error code.

include/blosc2.h

@@ -2091,7 +2091,7 @@ BLOSC_EXPORT int64_t blosc2_schunk_frame_len(blosc2_schunk* schunk);
  * If there is an error, a negative value is returned.
  */
 BLOSC_EXPORT int64_t blosc2_schunk_fill_special(blosc2_schunk* schunk, int64_t nitems,
-                                            int special_value, int32_t chunksize);
+                                                int special_value, int32_t chunksize);
 
 
 /*********************************************************************