[svn-r15682] Purpose: fix bug 1298

Description: The optimized "subset" compound conversion function would
improperly copy the "blank" space at the end of compound types.  Modified
H5T_conv_struct_init to detect when the subset type has extra space at the end,
and calculate the size of the data that should be copied into the conversion
buffer for each element.  Changes to the functions that implement these
conversions.

Tested: kagiso, linew, smirom (h5committest)

1 files changed, 10 insertions, 10 deletions

diff --git a/src/H5Dscatgath.c b/src/H5Dscatgath.c
index cb07708..867303f 100644
--- a/src/H5Dscatgath.c
+++ b/src/H5Dscatgath.c
@@ -519,7 +519,7 @@ H5D_scatgath_read(const H5D_io_info_t *io_info, const H5D_type_info_t *type_info
          * and no conversion is needed, copy the data directly into user's buffer and
          * bypass the rest of steps.
          */
-        if(H5T_SUBSET_FALSE != type_info->cmpd_subset) {
+        if(type_info->cmpd_subset && H5T_SUBSET_FALSE != type_info->cmpd_subset->subset) {
             if(H5D_compound_opt_read(smine_nelmts, mem_space, &mem_iter, dxpl_cache,
                     type_info, buf /*out*/) < 0)
                 HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "datatype conversion failed")
@@ -649,7 +649,8 @@ H5D_scatgath_write(const H5D_io_info_t *io_info, const H5D_type_info_t *type_inf
          * is a subset of the destination, the optimization is done in conversion
          * function H5T_conv_struct_opt to protect the background data.
          */
-        if(H5T_SUBSET_DST == type_info->cmpd_subset) {
+        if(type_info->cmpd_subset && H5T_SUBSET_DST == type_info->cmpd_subset->subset
+            && type_info->dst_type_size == type_info->cmpd_subset->copy_size) {
             if(H5D_compound_opt_write(smine_nelmts, type_info) < 0)
                 HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "datatype conversion failed")
         } /* end if */
@@ -745,7 +746,7 @@ H5D_compound_opt_read(size_t nelmts, const H5S_t *space,
     hsize_t    *off = NULL;                     /* Pointer to sequence offsets */
     size_t     _len[H5D_IO_VECTOR_SIZE];        /* Array to store sequence lengths */
     size_t     *len = NULL;                     /* Pointer to sequence lengths */
-    size_t     src_stride, dst_stride, type_size;
+    size_t     src_stride, dst_stride, copy_size;
     herr_t     ret_value = SUCCEED;	       /*return value		*/
 
     FUNC_ENTER_NOAPI_NOINIT(H5D_compound_opt_read)
@@ -756,6 +757,9 @@ H5D_compound_opt_read(size_t nelmts, const H5S_t *space,
     HDassert(iter);
     HDassert(dxpl_cache);
     HDassert(type_info);
+    HDassert(type_info->cmpd_subset);
+    HDassert(H5T_SUBSET_SRC == type_info->cmpd_subset->subset ||
+        H5T_SUBSET_DST == type_info->cmpd_subset->subset);
     HDassert(user_buf);
 
     /* Allocate the vector I/O arrays */
@@ -774,12 +778,8 @@ H5D_compound_opt_read(size_t nelmts, const H5S_t *space,
     src_stride = type_info->src_type_size;
     dst_stride = type_info->dst_type_size;
 
-    if(H5T_SUBSET_SRC == type_info->cmpd_subset)
-        type_size = src_stride;
-    else {
-        HDassert(H5T_SUBSET_DST == type_info->cmpd_subset);
-        type_size = dst_stride;
-    } /* end else */
+    /* Get the size, in bytes, to copy for each element */
+    copy_size = type_info->cmpd_subset->copy_size;
 
     /* Loop until all elements are written */
     xdbuf = type_info->tconv_buf;
@@ -811,7 +811,7 @@ H5D_compound_opt_read(size_t nelmts, const H5S_t *space,
 
             /* Copy the data into the right place. */
             for(i = 0; i < curr_nelmts; i++) {
-                HDmemmove(xubuf, xdbuf, type_size);
+                HDmemmove(xubuf, xdbuf, copy_size);
 
                 /* Update pointers */
                 xdbuf += src_stride;