From d8d31596b423c34d96a826f0d82188f55551bb14 Mon Sep 17 00:00:00 2001
From: Quincey Koziol <koziol@hdfgroup.org>
Date: Wed, 17 Mar 1999 20:30:03 -0500
Subject: [svn-r1146] Added support for object references to named datatypes.

---
 src/H5R.c        | 12 ++++++++++++
 src/H5T.c        | 43 +++++++++++++++++++++++++++++++++++++++----
 src/H5Tprivate.h |  1 +
 3 files changed, 52 insertions(+), 4 deletions(-)

diff --git a/src/H5R.c b/src/H5R.c
index 8662924..447b7cb 100644
--- a/src/H5R.c
+++ b/src/H5R.c
@@ -26,6 +26,7 @@ static char		RcsId[] = "@(#)$Revision$";
 #include <H5MMprivate.h>    /* Memory Management */
 #include <H5Rprivate.h>		/* References */
 #include <H5Sprivate.h>		/* Dataspaces */
+#include <H5Tprivate.h>		/* Datatypes */
 
 /* Interface initialization */
 #define PABLO_MASK	H5R_mask
@@ -331,6 +332,7 @@ H5R_dereference(H5D_t *dset, H5R_type_t ref_type, void *_ref)
 {
     H5D_t *dataset;             /* Pointer to dataset to open */
     H5G_t *group;               /* Pointer to group to open */
+    H5T_t *datatype;            /* Pointer to datatype to open */
     H5G_entry_t ent;            /* Symbol table entry */
     uint8_t *p;                 /* Pointer to OID to store */
     intn oid_type;              /* type of object being dereferenced */
@@ -415,6 +417,16 @@ H5R_dereference(H5D_t *dset, H5R_type_t ref_type, void *_ref)
             break;
 
         case H5G_TYPE:
+            if ((datatype=H5T_open_oid(&ent)) == NULL) {
+                HGOTO_ERROR(H5E_DATATYPE, H5E_NOTFOUND, FAIL, "not found");
+            }
+
+            /* Create an atom for the dataset */
+            if ((ret_value = H5I_register(H5I_DATATYPE, datatype)) < 0) {
+                H5T_close(datatype);
+                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL,
+                      "can't register group");
+            }
             break;
 
         case H5G_DATASET:
diff --git a/src/H5T.c b/src/H5T.c
index 746afa6..28fe21c 100644
--- a/src/H5T.c
+++ b/src/H5T.c
@@ -4197,6 +4197,7 @@ H5T_isa(H5G_entry_t *ent)
  *              Monday, June  1, 1998
  *
  * Modifications:
+ *      Changed to use H5T_open_oid - QAK - 3/17/99
  *
  *-------------------------------------------------------------------------
  */
@@ -4217,23 +4218,57 @@ H5T_open (H5G_entry_t *loc, const char *name)
     if (H5G_find (loc, name, NULL, &ent/*out*/)<0) {
 	HRETURN_ERROR (H5E_DATATYPE, H5E_NOTFOUND, NULL, "not found");
     }
-    if (H5O_open (&ent)<0) {
+    /* Open the datatype object */
+    if ((dt=H5T_open_oid(&ent)) ==NULL) {
+        HRETURN_ERROR(H5E_DATATYPE, H5E_NOTFOUND, NULL, "not found");
+    }
+
+    FUNC_LEAVE (dt);
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5T_open_oid
+ *
+ * Purpose:	Open a named data type.
+ *
+ * Return:	Success:	Ptr to a new data type.
+ *
+ *		Failure:	NULL
+ *
+ * Programmer:	Quincey Koziol
+ *              Wednesday, March 17, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+H5T_t *
+H5T_open_oid (H5G_entry_t *ent)
+{
+    H5T_t	*dt = NULL;
+    
+    FUNC_ENTER (H5T_open_oid, NULL);
+    assert (ent);
+
+    if (H5O_open (ent)<0) {
 	HRETURN_ERROR (H5E_DATATYPE, H5E_CANTOPENOBJ, NULL,
 		       "unable to open named data type");
     }
-    if (NULL==(dt=H5O_read (&ent, H5O_DTYPE, 0, NULL))) {
-	H5O_close(&ent);
+    if (NULL==(dt=H5O_read (ent, H5O_DTYPE, 0, NULL))) {
+	H5O_close(ent);
 	HRETURN_ERROR (H5E_DATATYPE, H5E_CANTINIT, NULL,
 		       "unable to load type message from object header");
     }
 
     /* Mark the type as named and open */
     dt->state = H5T_STATE_OPEN;
-    dt->ent = ent;
+    dt->ent = *ent;
 
     FUNC_LEAVE (dt);
 }
 
+
 
 /*-------------------------------------------------------------------------
  * Function:	H5T_copy
diff --git a/src/H5Tprivate.h b/src/H5Tprivate.h
index f37ebe9..8d59f40 100644
--- a/src/H5Tprivate.h
+++ b/src/H5Tprivate.h
@@ -65,6 +65,7 @@ __DLL__ herr_t H5T_native_open(void);
 __DLL__ herr_t H5T_init(void);
 __DLL__ htri_t H5T_isa(H5G_entry_t *ent);
 __DLL__ H5T_t *H5T_open(H5G_entry_t *loc, const char *name);
+__DLL__ H5T_t *H5T_open_oid(H5G_entry_t *ent);
 __DLL__ H5T_t *H5T_create(H5T_class_t type, size_t size);
 __DLL__ H5T_t *H5T_copy(const H5T_t *old_dt, H5T_copy_t method);
 __DLL__ herr_t H5T_commit(H5G_entry_t *loc, const char *name, H5T_t *type);
-- 
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