[svn-r9155] Purpose:

    Bug fix (sorta)

Description:
    Change reading of "missing" chunks from datasets with undefined fill
values to not overwrite the application buffer with random garbage from
memory.  Note that this is almost the same, since whatever garbage the
application had in those locations will still be there...

Platforms tested:
    FreeBSD 4.10 (sleipnir)
    IRIX64 6.5 (modi4)
    h5committested

1 files changed, 106 insertions, 0 deletions

diff --git a/test/dsets.c b/test/dsets.c
index cd3cbc5..6b29031 100644
--- a/test/dsets.c
+++ b/test/dsets.c
@@ -117,6 +117,10 @@ const char *FILENAME[] = {
 /* Names for zero-dim test */
 #define ZERODIM_DATASET "zerodim"
 
+/* Parameters for zero-dim test */
+#define MISSING_CHUNK_DATASET   "missing_chunk"
+#define MISSING_CHUNK_DIM       100
+
 /* Shared global arrays */
 #define DSET_DIM1       100
 #define DSET_DIM2       200
@@ -3677,6 +3681,107 @@ error:
 
 
 /*-------------------------------------------------------------------------
+ * Function: test_missing_chunk
+ *
+ * Purpose: Tests that reads from chunked dataset with undefined fill value and
+ *              not all chunks written don't overwrite data in user's buffer
+ *              for missing chunks.
+ *
+ * Return: Success: 0
+ *  Failure: -1
+ *
+ * Programmer: Quincey Koziol
+ *              Tuesday, August 25, 2004
+ *
+ * Modifications:
+ *             
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+test_missing_chunk(hid_t file)
+{
+    hid_t       s=-1, d=-1, dcpl=-1;
+    hssize_t	hs_start[1];
+    hsize_t	hs_stride[1],
+                hs_count[1],
+                hs_block[1];
+    int         wdata[MISSING_CHUNK_DIM],
+                rdata[MISSING_CHUNK_DIM];
+    hsize_t     dsize=100, dmax=H5S_UNLIMITED, csize=5;
+    size_t      u;
+    
+    TESTING("Read dataset with unwritten chunk & undefined fill value");
+
+    /* Initialize data */
+    for(u=0; u<MISSING_CHUNK_DIM; u++) {
+        wdata[u]=u;
+        rdata[u]=911;
+    } /* end for */
+
+    /* Create dataspace */
+    if((s = H5Screate_simple(1, &dsize, &dmax))<0) TEST_ERROR;
+
+    /* Create dataset creation property list */
+    if((dcpl = H5Pcreate(H5P_DATASET_CREATE))<0) TEST_ERROR;
+
+    /* Set to chunked */
+    if(H5Pset_chunk(dcpl, 1, &csize)<0) TEST_ERROR;
+
+    /* Undefine fill value */
+    if(H5Pset_fill_value(dcpl, H5T_NATIVE_INT, NULL)<0) TEST_ERROR;
+
+    /* Create dataset */
+    if((d = H5Dcreate(file, MISSING_CHUNK_DATASET, H5T_NATIVE_INT, s, dcpl))<0) TEST_ERROR;
+
+    /* Select elements in every other chunk */
+    hs_start[0]=0;
+    hs_stride[0]=10;
+    hs_count[0]=10;
+    hs_block[0]=5;
+    if (H5Sselect_hyperslab(s, H5S_SELECT_SET, hs_start, hs_stride, hs_count,
+			    hs_block)<0) TEST_ERROR;
+
+    /* Write selected data */
+    if(H5Dwrite(d, H5T_NATIVE_INT, s, s, H5P_DEFAULT, wdata)<0) TEST_ERROR;
+
+    /* Read all data */
+    if(H5Dread(d, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata)<0) TEST_ERROR;
+
+    /* Validata values read */
+    for(u=0; u<MISSING_CHUNK_DIM; u++) {
+        if((u%10)>=5) {
+            if(rdata[u]!=911) {
+                printf("    Line %d: Incorrect value, rdata[%u]=%d\n",__LINE__,(unsigned)u,rdata[u]);
+                TEST_ERROR;
+            } /* end if */
+        } /* end if */
+        else {
+            if(rdata[u]!=wdata[u]) {
+                printf("    Line %d: Incorrect value, wdata[%u]=%d, rdata[%u]=%d\n",__LINE__,(unsigned)u,wdata[u],(unsigned)u,rdata[u]);
+                TEST_ERROR;
+            } /* end if */
+        } /* end else */
+    } /* end for */
+
+    /* Close everything */
+    if(H5Pclose(dcpl)<0) TEST_ERROR;
+    if(H5Sclose(s)<0) TEST_ERROR;
+    if(H5Dclose(d)<0) TEST_ERROR;
+ 
+    PASSED();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Pclose(dcpl);
+        H5Dclose(d);
+        H5Sclose(s);
+    } H5E_END_TRY;
+    return -1;
+} /* end test_zero_dims() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	main
  *
  * Purpose:	Tests the dataset interface (H5D)
@@ -3745,6 +3850,7 @@ main(void)
     nerrors += test_filter_delete(file)<0	?1:0;
     nerrors += test_filters_endianess()<0	?1:0;
     nerrors += test_zero_dims(file)<0	?1:0;
+    nerrors += test_missing_chunk(file)<0	?1:0;
 
     if (H5Fclose(file)<0) goto error;
     if (nerrors) goto error;