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authorRobb Matzke <matzke@llnl.gov>1998-01-22 19:57:48 (GMT)
committerRobb Matzke <matzke@llnl.gov>1998-01-22 19:57:48 (GMT)
commitdec0c95436846315e677c69fdb8c44c0dd0a8c8b (patch)
tree1f63e3d112762453aac71cf36e4564f50d40efa3 /src/H5Tconv.c
parenta0ee2c57e934c5ff2269e345238a6ee019f6c294 (diff)
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[svn-r165] Changes since 19980122
---------------------- ./src/H5.c ./src/H5B.c ./src/H5Bprivate.h Changed `new' to something else in 6 places for Fabio. ./src/H5T.c ./src/H5Tconv.c Beginning to work on compound data type conversion. Don't look yet :-)
Diffstat (limited to 'src/H5Tconv.c')
-rw-r--r--src/H5Tconv.c93
1 files changed, 88 insertions, 5 deletions
diff --git a/src/H5Tconv.c b/src/H5Tconv.c
index d5ad0bb..ff612ba 100644
--- a/src/H5Tconv.c
+++ b/src/H5Tconv.c
@@ -11,12 +11,13 @@
#include <H5Aprivate.h>
#include <H5Eprivate.h>
+#include <H5MMprivate.h>
#include <H5Tpkg.h>
/* Interface initialization */
-static intn interface_initialize_g = FALSE;
+static intn interface_initialize_g = FALSE;
#define INTERFACE_INIT NULL
-
+
/*-------------------------------------------------------------------------
* Function: H5T_conv_noop
*
@@ -41,7 +42,7 @@ H5T_conv_noop(hid_t src_id, hid_t dst_id, size_t nelmts,
FUNC_ENTER(H5T_conv_noop, FAIL);
FUNC_LEAVE(SUCCEED);
}
-
+
/*-------------------------------------------------------------------------
* Function: H5T_conv_order
*
@@ -84,6 +85,7 @@ H5T_conv_order(hid_t src_id, hid_t dst_id, size_t nelmts,
HRETURN_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL,
"background values not supported in this conv path");
}
+
if (!buf) {
/* Capability query */
if (src->size != dst->size ||
@@ -138,7 +140,19 @@ H5T_conv_order(hid_t src_id, hid_t dst_id, size_t nelmts,
* Function: H5T_conv_struct
*
* Purpose: Converts between compound data types. This is a soft
- * conversion function.
+ * conversion function. The algorithm is basically:
+ *
+ * For I=1..NUM_MEMBERS do
+ * If sizeof detination type <= sizeof source type then
+ * Convert member to destination type;
+ * Move member as far left as possible;
+ *
+ * For I=NUM_MEMBERS..1 do
+ * If not destination type then
+ * Convert member to destination type;
+ * Move member to correct position in BACKGROUND
+ *
+ * Copy BACKGROUND to BUF
*
* Return: Success: SUCCEED
*
@@ -155,10 +169,79 @@ herr_t
H5T_conv_struct(hid_t src_id, hid_t dst_id, size_t nelmts,
void *_buf, const void *background)
{
+ uint8 *buf = (uint8 *)_buf; /*cast for pointer arithmetic */
+ H5T_t *src = NULL; /*source data type */
+ H5T_t *dst = NULL; /*destination data type */
+ intn *dst2src_map = NULL; /*maps dst member to src member */
+ intn i;
+
FUNC_ENTER (H5T_conv_struct, FAIL);
- HRETURN_ERROR (H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "not implemented yet");
+ /* Check args */
+ if (H5_DATATYPE != H5A_group(src_id) ||
+ NULL == (src = H5A_object(src_id)) ||
+ H5_DATATYPE != H5A_group(dst_id) ||
+ NULL == (dst = H5A_object(dst_id))) {
+ HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data type");
+ }
+ if (background) {
+ HRETURN_ERROR(H5E_ARGS, H5E_UNSUPPORTED, FAIL,
+ "background values not supported in this conv path");
+ }
+
+ /* Capability query? */
+ if (!buf) {
+ assert (H5T_COMPOUND==src->type);
+ assert (H5T_COMPOUND==dst->type);
+ HRETURN (SUCCEED);
+ }
+
+ /*
+ * Build a mapping from destination member number to source member number
+ */
+ H5T_sort_by_offset (src);
+ H5T_sort_by_offset (dst);
+ dst2src_map = H5MM_xmalloc (dst->u.compnd.nmembs * sizeof(intn));
+ for (i=0; i<src->u.compnd.nmembs; i++) {
+ }
+
+
+
+ /*
+ * For each source member which will be present in the destination,
+ * convert the member to the destination type unless it is larger than
+ * the source type. Then move the member to the left-most unoccupied
+ * position in the buffer. This makes the data point as small as
+ * possible with all the free space on the right side.
+ */
+ for (i=0; i<src->u.compnd.nmembs; i++) {
+ }
+
+
+ /*
+ * For each source member which will be present in the destination,
+ * convert the member to the destination type if it is larger than the
+ * source type (that is, has not been converted yet). Then copy the
+ * member to the destination offset in the background buffer.
+ */
+ for (i=src->u.compnd.nmembs-1; i>=0; --i) {
+ }
+
+ /*
+ * Copy the background buffer back into the in-place conversion buffer.
+ */
+ HDmemcpy (buf, background, dst->size);
+
+
+
+
+
+
+
+
+
+ HRETURN_ERROR (H5E_DATATYPE, H5E_UNSUPPORTED, FAIL, "not implemented yet");
FUNC_LEAVE (SUCCEED);
}