Support repeated values larger than 8-bit

Blosc · Feb 17, 2025 · 6d504a4 · 6d504a4
1 parent 14c3af1
commit 6d504a4
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Showing 4 changed files with 43 additions and 24 deletions.
diff --git a/blosc/b2nd.c b/blosc/b2nd.c
@@ -355,7 +355,6 @@ int array_new(b2nd_context_t *ctx, int special_value, b2nd_array_t **array) {
   if ((*array)->nitems != 0) {
     int64_t nchunks = (*array)->extnitems / (*array)->chunknitems;
     int64_t nitems = nchunks * (*array)->extchunknitems;
-    // blosc2_schunk_fill_special(sc, nitems, BLOSC2_SPECIAL_ZERO, chunksize);
     BLOSC_ERROR(blosc2_schunk_fill_special(sc, nitems, special_value, chunksize));
   }
   (*array)->sc = sc;

diff --git a/blosc/blosc2.c b/blosc/blosc2.c
@@ -2160,7 +2160,7 @@ static int initialize_context_compression(
   context->output_bytes = 0;
   context->destsize = destsize;
   context->sourcesize = srcsize;
-  context->typesize = (int32_t)typesize;
+  context->typesize = typesize;
   context->filter_flags = filters_to_flags(filters);
   for (int i = 0; i < BLOSC2_MAX_FILTERS; i++) {
     context->filters[i] = filters[i];
@@ -4417,8 +4417,7 @@ int blosc2_chunk_nans(blosc2_cparams cparams, const int32_t nbytes, void* dest,
 /* Create a chunk made of repeated values */
 int blosc2_chunk_repeatval(blosc2_cparams cparams, const int32_t nbytes,
                            void* dest, int32_t destsize, const void* repeatval) {
-  uint8_t typesize = cparams.typesize;
-  if (destsize < BLOSC_EXTENDED_HEADER_LENGTH + typesize) {
+  if (destsize < BLOSC_EXTENDED_HEADER_LENGTH + cparams.typesize) {
     BLOSC_TRACE_ERROR("dest buffer is not long enough");
     return BLOSC2_ERROR_DATA;
   }
@@ -4450,17 +4449,17 @@ int blosc2_chunk_repeatval(blosc2_cparams cparams, const int32_t nbytes,
   header.version = BLOSC2_VERSION_FORMAT;
   header.versionlz = BLOSC_BLOSCLZ_VERSION_FORMAT;
   header.flags = BLOSC_DOSHUFFLE | BLOSC_DOBITSHUFFLE;  // extended header
-  header.typesize = (uint8_t)typesize;
+  header.typesize = context->typesize;
   header.nbytes = (int32_t)nbytes;
   header.blocksize = context->blocksize;
-  header.cbytes = BLOSC_EXTENDED_HEADER_LENGTH + (int32_t)typesize;
+  header.cbytes = BLOSC_EXTENDED_HEADER_LENGTH + cparams.typesize;
   header.blosc2_flags = BLOSC2_SPECIAL_VALUE << 4;  // mark chunk as all repeated value
   memcpy((uint8_t *)dest, &header, sizeof(header));
-  memcpy((uint8_t *)dest + sizeof(header), repeatval, typesize);
+  memcpy((uint8_t *)dest + sizeof(header), repeatval, cparams.typesize);
 
   blosc2_free_ctx(context);
 
-  return BLOSC_EXTENDED_HEADER_LENGTH + (uint8_t)typesize;
+  return BLOSC_EXTENDED_HEADER_LENGTH + cparams.typesize;
 }
 
 

diff --git a/include/blosc2.h b/include/blosc2.h
@@ -429,7 +429,7 @@ enum {
   BLOSC2_NO_SPECIAL = 0x0,       //!< no special value
   BLOSC2_SPECIAL_ZERO = 0x1,     //!< zero special value
   BLOSC2_SPECIAL_NAN = 0x2,      //!< NaN special value
-  BLOSC2_SPECIAL_VALUE = 0x3,    //!< generic special value
+  BLOSC2_SPECIAL_VALUE = 0x3,    //!< repeated special value
   BLOSC2_SPECIAL_UNINIT = 0x4,   //!< non initialized values
   BLOSC2_SPECIAL_LASTID = 0x4,   //!< last valid ID for special value (update this adequately)
   BLOSC2_SPECIAL_MASK = 0x7      //!< special value mask (prev IDs cannot be larger than this)

diff --git a/tests/b2nd/test_b2nd_full.c b/tests/b2nd/test_b2nd_full.c
@@ -16,34 +16,38 @@ CUTEST_TEST_SETUP(full) {
   blosc2_init();
 
   // Add parametrizations
-  CUTEST_PARAMETRIZE(typesize, uint8_t, CUTEST_DATA(
-      1, 2, 4, 8
+  CUTEST_PARAMETRIZE(typesize, int32_t, CUTEST_DATA(
+      //1, 2, 4, 8,
+      256, // 256, 257, 256 * 256,
+      // 256*256*256, 256*256*256*8  # these should work for small shapes as well, but are too slow
   ));
   CUTEST_PARAMETRIZE(shapes, _test_shapes, CUTEST_DATA(
-      {0, {0}, {0}, {0}}, // 0-dim
-      {1, {5}, {3}, {2}}, // 1-idim
-      {2, {20, 0}, {7, 0}, {3, 0}}, // 0-shape
-      {2, {20, 10}, {7, 5}, {3, 5}}, // 0-shape
-      {2, {14, 10}, {8, 5}, {2, 2}}, // general,
-      {3, {12, 10, 14}, {3, 5, 9}, {3, 4, 4}}, // general
-      {3, {10, 21, 20, 5}, {8, 7, 15, 3}, {5, 5, 10, 1}}, // general,
+      {1, {3}, {3}, {3}}, // 1-idim
+      // {0, {0}, {0}, {0}}, // 0-dim
+      //{1, {5}, {3}, {2}}, // 1-idim
+      // {2, {20, 0}, {7, 0}, {3, 0}}, // 0-shape
+      // {2, {20, 10}, {7, 5}, {3, 5}}, // 0-shape
+      // {2, {14, 10}, {8, 5}, {2, 2}}, // general,
+      // {3, {12, 10, 14}, {3, 5, 9}, {3, 4, 4}}, // general
+      // {3, {10, 21, 20, 5}, {8, 7, 15, 3}, {5, 5, 10, 1}}, // general,
   ));
   CUTEST_PARAMETRIZE(backend, _test_backend, CUTEST_DATA(
       {false, false},
-      {true, false},
-      {true, true},
-      {false, true},
+      // {true, false},
+      // {true, true},
+      // {false, true},
   ));
   CUTEST_PARAMETRIZE(fill_value, int8_t, CUTEST_DATA(
-      3, 113, 33, -5
+      //3, 113, 33, -5
+      3
   ));
 }
 
 
 CUTEST_TEST_TEST(full) {
   CUTEST_GET_PARAMETER(backend, _test_backend);
   CUTEST_GET_PARAMETER(shapes, _test_shapes);
-  CUTEST_GET_PARAMETER(typesize, uint8_t);
+  CUTEST_GET_PARAMETER(typesize, uint32_t);
   CUTEST_GET_PARAMETER(fill_value, int8_t);
 
   char *urlpath = "test_full.b2frame";
@@ -85,6 +89,10 @@ CUTEST_TEST_TEST(full) {
       ((int8_t *) value)[0] = fill_value;
       break;
     default:
+      // Fill a buffer with fill_value
+      for (int i = 0; i < typesize; ++i) {
+        value[i] = fill_value;
+      }
       break;
   }
 
@@ -96,6 +104,7 @@ CUTEST_TEST_TEST(full) {
 
   /* Testing */
   for (int i = 0; i < buffersize / typesize; ++i) {
+    uint8_t *buffer_fill = malloc(typesize);
     bool is_true = false;
     switch (typesize) {
       case 8:
@@ -111,9 +120,21 @@ CUTEST_TEST_TEST(full) {
         is_true = ((int8_t *) buffer_dest)[i] == fill_value;
         break;
       default:
+        // Fill a buffer with fill_value and compare with buffer_dest
+        for (int j = 0; j < typesize; ++j) {
+          buffer_fill[j] = fill_value;
+        }
+        // Compare buffer_fill with buffer_dest
+        is_true = memcmp(buffer_fill, buffer_dest, typesize) == 0;
+        // print the 10 first bytes of buffer_fill and buffer_dest
+        printf("buffer_fill: ");
+        for (int j = 0; j < 10; ++j) {
+          printf("%d vs %d ", buffer_fill[j], buffer_dest[j]);
+        }
+        free(buffer_fill);
         break;
     }
-    CUTEST_ASSERT("Elements are not equals", is_true);
+    CUTEST_ASSERT("Elements are not equal", is_true);
   }
 
   /* Free mallocs */