[svn-r11176] Purpose:

    Bug fix

Description:
    Correct problems when querying information about a group that was opened
by dereferencing an object reference.

Solution:
    Read in symbol table information instead of rely on it being cached.

Platforms tested:
    FreeBSD 4.11 (sleipnir)
    Too minor to require h5committest

5 files changed, 138 insertions, 47 deletions

diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index ed5c1cf..67dd598 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -305,6 +305,8 @@ Bug Fixes since HDF5-1.6.0 release
 
     Library
     -------
+        - Corrected errors when querying information about a group opened
+            by dereferencing an object reference.  QAK - 2005/07/30
         - Fixed a bug with named datatypes where a copy of a named datatype
             used to create a dataset would accidentally use the original
             named datatype for the dataset's datatype.  QAK - 2005/07/23
diff --git a/src/H5G.c b/src/H5G.c
index c2305c5..d1c5ac9 100644
--- a/src/H5G.c
+++ b/src/H5G.c
@@ -104,7 +104,6 @@
 #include "H5HLprivate.h"	/* Local Heaps				*/
 #include "H5Iprivate.h"		/* IDs			  		*/
 #include "H5MMprivate.h"	/* Memory management			*/
-#include "H5Oprivate.h"		/* Object headers		  	*/
 #include "H5Pprivate.h"         /* Property lists                       */
 
 /* Local macros */
@@ -592,11 +591,8 @@ ssize_t
 H5Gget_objname_by_idx(hid_t loc_id, hsize_t idx, char *name, size_t size)
 {
     H5G_entry_t		*loc = NULL;    /* Pointer to symbol table entry */
-#ifdef OLD_WAY
-    hsize_t             num_objs;
-#endif /* OLD_WAY */
     ssize_t		ret_value = FAIL;
-    
+
     FUNC_ENTER_API(H5Gget_objname_by_idx, FAIL);
     H5TRACE4("Zs","ihsz",loc_id,idx,name,size);
 
@@ -605,19 +601,7 @@ H5Gget_objname_by_idx(hid_t loc_id, hsize_t idx, char *name, size_t size)
 	HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a location ID");
     if(H5G_get_type(loc,H5AC_ind_dxpl_id)!=H5G_GROUP)
 	HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a group");
-        
-#ifdef OLD_WAY
-/* Don't check for the number of objects in the group currently, because this
- * has to iterate through the group in order to find out the information.
- * We might as well just iterate through all the group entries and error out
- * if we didn't find the index we are looking for. -QAK
- */
-    if (H5G_get_num_objs(loc, &num_objs, H5AC_ind_dxpl_id)<0)
-	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "unable to retrieve number of members");
-    if(idx >= num_objs)    
-	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "index out of bound");
-#endif /* OLD_WAY */
-        
+
     /*call private function*/
     ret_value = H5G_get_objname_by_idx(loc, idx, name, size, H5AC_ind_dxpl_id);
 
@@ -647,9 +631,6 @@ H5G_obj_t
 H5Gget_objtype_by_idx(hid_t loc_id, hsize_t idx)
 {
     H5G_entry_t		*loc = NULL;    /* Pointer to symbol table entry */
-#ifdef OLD_WAY
-    hsize_t             num_objs;
-#endif /* OLD_WAY */
     H5G_obj_t		ret_value;
     
     FUNC_ENTER_API(H5Gget_objtype_by_idx, H5G_UNKNOWN);
@@ -660,19 +641,7 @@ H5Gget_objtype_by_idx(hid_t loc_id, hsize_t idx)
 	HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, H5G_UNKNOWN, "not a location ID");
     if(H5G_get_type(loc,H5AC_ind_dxpl_id)!=H5G_GROUP)
 	HGOTO_ERROR (H5E_ARGS, H5E_BADTYPE, H5G_UNKNOWN, "not a group");
-        
-#ifdef OLD_WAY
-/* Don't check for the number of objects in the group currently, because this
- * has to iterate through the group in order to find out the information.
- * We might as well just iterate through all the group entries and error out
- * if we didn't find the index we are looking for. -QAK
- */
-    if (H5G_get_num_objs(loc, &num_objs, H5AC_ind_dxpl_id)<0)
-	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5G_UNKNOWN, "unable to retrieve number of members");
-    if(idx >= num_objs)    
-	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5G_UNKNOWN, "index out of bound");
-#endif /* OLD_WAY */
-        
+
     /*call private function*/
     ret_value = H5G_get_objtype_by_idx(loc, idx, H5AC_ind_dxpl_id);
 
@@ -2912,21 +2881,25 @@ done:
 static herr_t 
 H5G_get_num_objs(H5G_entry_t *loc, hsize_t *num_objs, hid_t dxpl_id)
 {
+    H5O_stab_t		stab_mesg;		/*info about B-tree	*/
     herr_t		ret_value;
     
     FUNC_ENTER_NOAPI(H5G_get_num_objs, FAIL);
 
     /* Sanity check */
     assert(loc);
-    assert(loc->type==H5G_CACHED_STAB);
     assert(num_objs);
 
     /* Reset the number of objects in the group */
     *num_objs = 0;
 
+    /* Get the B-tree info */
+    if (NULL==H5O_read (loc, H5O_STAB_ID, 0, &stab_mesg, dxpl_id))
+	HGOTO_ERROR (H5E_SYM, H5E_NOTFOUND, FAIL, "unable to determine local heap address");
+
     /* Iterate over the group members */
     if ((ret_value = H5B_iterate (loc->file, dxpl_id, H5B_SNODE,
-              H5G_node_sumup, loc->cache.stab.btree_addr, num_objs))<0)
+              H5G_node_sumup, stab_mesg.btree_addr, num_objs))<0)
         HERROR (H5E_SYM, H5E_CANTINIT, "iteration operator failed");
         
 done:
@@ -2954,6 +2927,7 @@ done:
 static ssize_t 
 H5G_get_objname_by_idx(H5G_entry_t *loc, hsize_t idx, char* name, size_t size, hid_t dxpl_id)
 {
+    H5O_stab_t		stab_mesg;	/*info about local heap	& B-tree */
     H5G_bt_ud3_t	udata;          /* Iteration information */
     ssize_t		ret_value;      /* Return value */
     
@@ -2961,17 +2935,20 @@ H5G_get_objname_by_idx(H5G_entry_t *loc, hsize_t idx, char* name, size_t size, h
 
     /* Sanity check */
     assert(loc);
-    assert(loc->type==H5G_CACHED_STAB);
+
+    /* Get the B-tree & local heap info */
+    if (NULL==H5O_read (loc, H5O_STAB_ID, 0, &stab_mesg, dxpl_id))
+	HGOTO_ERROR (H5E_SYM, H5E_NOTFOUND, FAIL, "unable to determine local heap address");
 
     /* Set iteration information */
     udata.idx = idx;
     udata.num_objs = 0;
-    udata.ent = loc;
+    udata.mesg = &stab_mesg;
     udata.name = NULL;
 
     /* Iterate over the group members */
     if ((ret_value = H5B_iterate (loc->file, dxpl_id, H5B_SNODE,
-              H5G_node_name, loc->cache.stab.btree_addr, &udata))<0)
+              H5G_node_name, stab_mesg.btree_addr, &udata))<0)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "iteration operator failed");
     
     /* If we don't know the name now, we almost certainly went out of bounds */
@@ -3016,24 +2993,28 @@ done:
 static H5G_obj_t 
 H5G_get_objtype_by_idx(H5G_entry_t *loc, hsize_t idx, hid_t dxpl_id)
 {
-    H5G_bt_ud3_t    udata;              /* User data for B-tree callback */
-    H5G_obj_t	    ret_value;          /* Return value */
+    H5O_stab_t		stab_mesg;	/*info about local heap	& B-tree */
+    H5G_bt_ud3_t	udata;          /* User data for B-tree callback */
+    H5G_obj_t		ret_value;      /* Return value */
     
     FUNC_ENTER_NOAPI(H5G_get_objtype_by_idx, H5G_UNKNOWN);
     
     /* Sanity check */
     assert(loc);
-    assert(loc->type==H5G_CACHED_STAB);
+
+    /* Get the B-tree & local heap info */
+    if (NULL==H5O_read (loc, H5O_STAB_ID, 0, &stab_mesg, dxpl_id))
+	HGOTO_ERROR (H5E_SYM, H5E_NOTFOUND, FAIL, "unable to determine local heap address");
 
     /* Set iteration information */
     udata.idx = idx;
     udata.num_objs = 0;
-    udata.ent = loc;
+    udata.mesg = &stab_mesg;
     udata.type = H5G_UNKNOWN;
     
     /* Iterate over the group members */
     if (H5B_iterate (loc->file, dxpl_id, H5B_SNODE,
-              H5G_node_type, loc->cache.stab.btree_addr, &udata)<0)
+              H5G_node_type, stab_mesg.btree_addr, &udata)<0)
 	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5G_UNKNOWN, "iteration operator failed");
     
     /* If we don't know the type now, we almost certainly went out of bounds */
diff --git a/src/H5Gnode.c b/src/H5Gnode.c
index f88c89c..dfa607e 100644
--- a/src/H5Gnode.c
+++ b/src/H5Gnode.c
@@ -1679,7 +1679,7 @@ H5G_node_name(H5F_t *f, hid_t dxpl_id, const void UNUSED *_lt_key, haddr_t addr,
         loc_idx = bt_udata->idx - bt_udata->num_objs; 
         name_off = sn->entry[loc_idx].name_off;  
 
-        if (NULL == (heap = H5HL_protect(f, dxpl_id, bt_udata->ent->cache.stab.heap_addr)))
+        if (NULL == (heap = H5HL_protect(f, dxpl_id, bt_udata->mesg->heap_addr)))
             HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, H5B_ITER_ERROR, "unable to protect symbol name");
 
         name = H5HL_offset_into(f, heap, name_off);
@@ -1687,7 +1687,7 @@ H5G_node_name(H5F_t *f, hid_t dxpl_id, const void UNUSED *_lt_key, haddr_t addr,
         bt_udata->name = H5MM_strdup (name);
         assert(bt_udata->name);
 
-        if (H5HL_unprotect(f, dxpl_id, heap, bt_udata->ent->cache.stab.heap_addr, H5AC__NO_FLAGS_SET) < 0)
+        if (H5HL_unprotect(f, dxpl_id, heap, bt_udata->mesg->heap_addr, H5AC__NO_FLAGS_SET) < 0)
             HGOTO_ERROR(H5E_SYM, H5E_PROTECT, H5B_ITER_ERROR, "unable to unprotect symbol name");
         heap=NULL; name=NULL;
 
diff --git a/src/H5Gpkg.h b/src/H5Gpkg.h
index 36a18f9..f970b2d 100644
--- a/src/H5Gpkg.h
+++ b/src/H5Gpkg.h
@@ -32,6 +32,7 @@
 
 /* Other private headers needed by this file */
 #include "H5ACprivate.h"	/* Metadata cache			  */
+#include "H5Oprivate.h"		/* Object headers		  	*/
 
 /*
  * A symbol table node is a collection of symbol table entries.  It can
@@ -113,7 +114,7 @@ typedef struct H5G_bt_ud2_t {
  */
 typedef struct H5G_bt_ud3_t {
     /* downward */
-    H5G_entry_t *ent;           /*the entry of group being queried           */
+    const H5O_stab_t *mesg;     /*the symbol table message of group being queried */
     hsize_t      idx;           /*index of group member to be queried        */
     hsize_t      num_objs;      /*the number of objects having been traversed*/
 
diff --git a/test/trefer.c b/test/trefer.c
index e5d6e9e..cf2e99b 100644
--- a/test/trefer.c
+++ b/test/trefer.c
@@ -54,6 +54,11 @@ typedef struct s1_t {
     float c;
 } s1_t;
 
+#define GROUPNAME       "/group"
+#define GROUPNAME2      "group2"
+#define DSETNAME        "/dset"
+#define NAME_SIZE       16
+
 
 /****************************************************************
 **
@@ -910,6 +915,107 @@ test_reference_obj_deleted(void)
 
 /****************************************************************
 **
+**  test_reference_group_query(): Test H5R (reference) object reference code.
+**      Tests for correct behavior of query routines on dereferenced group
+** 
+****************************************************************/
+static void 
+test_reference_group_query(void)
+{
+    hid_t fid = -1;             /* File ID */
+    hid_t gid = -1, gid2 = -1;  /* Group IDs */
+    hid_t did;                  /* Dataset ID */
+    hid_t sid;                  /* Dataspace ID */
+    hsize_t nobjs;
+    hobj_ref_t wref;            /* Reference to write */
+    hobj_ref_t rref;            /* Reference to read */
+    char objname[NAME_SIZE];    /* Buffer to store name */
+    H5G_obj_t objtype;          /* Object type */
+    herr_t ret;
+    
+    /* Create file with a group and a dataset containing an object reference to the group */
+    fid = H5Fcreate(FILE1, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+    CHECK(fid, FAIL, "H5Fcreate");
+
+    /* Create group to refer to */
+    gid = H5Gcreate(fid, GROUPNAME, (size_t)0);
+    CHECK(gid, FAIL, "H5Gcreate");
+
+    /* Create nested group */
+    gid2 = H5Gcreate(gid, GROUPNAME2, (size_t)0);
+    CHECK(gid2, FAIL, "H5Gcreate");
+    ret = H5Gclose(gid2);
+    CHECK(ret, FAIL, "H5Gclose");
+
+    ret = H5Gclose(gid);
+    CHECK(ret, FAIL, "H5Gclose");
+
+    /* Create dataspace to use for dataset */
+    sid = H5Screate(H5S_SCALAR);
+    CHECK(sid, FAIL, "H5Screate");
+
+    /* Create dataset */
+    did = H5Dcreate(fid, DSETNAME, H5T_STD_REF_OBJ, sid, H5P_DEFAULT);
+    CHECK(did, FAIL, "H5Dcreate");
+
+    /* Create reference to group */
+    ret = H5Rcreate(&wref, fid, GROUPNAME, H5R_OBJECT, -1);
+    CHECK(ret, FAIL, "H5Rcreate");
+
+    /* Write reference to disk */
+    ret = H5Dwrite(did, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, &wref);
+    CHECK(ret, FAIL, "H5Dwrite");
+
+    /* Close objects */
+    ret = H5Dclose(did);
+    CHECK(ret, FAIL, "H5Dclose");
+    ret = H5Sclose(sid);
+    CHECK(ret, FAIL, "H5Sclose");
+    ret = H5Fclose(fid);
+    CHECK(ret, FAIL, "H5Fclose");
+
+
+    /* Re-open file */
+    fid = H5Fopen(FILE1, H5F_ACC_RDONLY, H5P_DEFAULT);
+    CHECK(fid, FAIL, "H5Fopen");
+
+    /* Re-open dataset */
+    did = H5Dopen(fid, DSETNAME);
+    CHECK(did, FAIL, "H5Dopen");
+
+    /* Read in the reference */
+    ret = H5Dread(did, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, &rref);
+    CHECK(ret, FAIL, "H5Dread");
+
+    /* Dereference to get the group */
+    gid = H5Rdereference(did, H5R_OBJECT, &rref);
+    CHECK(gid, FAIL, "H5Rdereference");
+
+    /* Various queries on the group opened */
+    ret = H5Gget_num_objs(gid, &nobjs);
+    CHECK(ret, FAIL, "H5Gget_num_objs");
+
+    VERIFY(nobjs, 1, "H5Gget_num_objs");
+
+    ret = H5Gget_objname_by_idx(gid, (hsize_t)0, objname, NAME_SIZE);
+    CHECK(ret, FAIL, "H5Gget_objname_by_idx");
+
+    VERIFY_STR(objname, "group2", "H5Gget_objname_by_idx");
+
+    objtype = H5Gget_objtype_by_idx(gid, (hsize_t)0);
+    VERIFY(objtype, H5G_GROUP, "H5Gget_objtype_by_idx");
+
+    /* Close objects */
+    ret = H5Dclose(did);
+    CHECK(ret, FAIL, "H5Dclose");
+    ret = H5Gclose(gid);
+    CHECK(ret, FAIL, "H5Gclose");
+    ret = H5Fclose(fid);
+    CHECK(ret, FAIL, "H5Fclose");
+}   /* test_reference_group_query() */
+
+/****************************************************************
+**
 **  test_reference(): Main H5R reference testing routine.
 ** 
 ****************************************************************/
@@ -923,6 +1029,7 @@ test_reference(void)
     test_reference_region();    /* Test basic H5R dataset region reference code */
     test_reference_region_1D(); /* Test H5R dataset region reference code for 1-D datasets */
     test_reference_obj_deleted(); /* Test H5R object reference code for deleted objects */
+    test_reference_group_query();   /* Test queries on dereferenced groups */
 
 }   /* test_reference() */