[svn-r11712] Purpose:

    New feature

Description:
    Check in baseline for compact group revisions, which radically revises the
source code for managing groups and object headers.

WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!
WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!

    This initiates the "unstable" phase of the 1.7.x branch, leading up
to the 1.8.0 release.  Please test this code, but do _NOT_ keep files created
with it - the format will change again before the release and you will not
be able to read your old files!!!

WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!
WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!  WARNING!!!!


Solution:
    There's too many changes to really describe them all, but some of them
include:
    - Stop abusing the H5G_entry_t structure and split it into two separate
        structures for non-symbol table node use within the library: H5O_loc_t
        for object locations in a file and H5G_name_t to store the path to
        an opened object.  H5G_entry_t is now only used for storing symbol
        table entries on disk.

    - Retire H5G_namei() in favor of a more general mechanism for traversing
        group paths and issuing callbacks on objects located.  This gets us out
        of the business of hacking H5G_namei() for new features, generally.

    - Revised H5O* routines to take a H5O_loc_t instead of H5G_entry_t

    - Lots more...

Platforms tested:
    h5committested and maybe another dozen configurations.... :-)

1 files changed, 59 insertions, 0 deletions

diff --git a/test/gen_old_group.c b/test/gen_old_group.c
new file mode 100644
index 0000000..ac617ba
--- /dev/null
+++ b/test/gen_old_group.c
@@ -0,0 +1,59 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
+ * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Programmer:  Quincey Koziol <koziol@ncsa.uiuc.edu>
+ *              Oct 24, 2005
+ *
+ * Purpose:     This program is run to generate an HDF5 data file with an
+ *              empty "symbol table" group.
+ *
+ *              This file is used in the v1.7 branch (after the "compact group"
+ *              checkin) to test compatability.  Compile and run this
+ *              program (with the 1.6.x branch), it will generate a file*
+ *              called "group_old.h5".  You need to move it to the test
+ *              directory in the HDF5 v1.7 source tree.  The test/stab.c
+ *              program will read it.
+ *
+ */
+
+#include "hdf5.h"
+
+#define FILENAME "group_old.h5"
+
+int main(void)
+{
+    hid_t fid = -1;             /* File ID */
+    hid_t gid = -1;             /* Group creation property list ID */
+
+    /* Create file for test groups */
+    if((fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) <0) goto error;
+
+    /* Create empty group that uses "symbol table" form to store links */
+    if((gid = H5Gcreate(fid, "old", (size_t)0)) < 0) goto error;
+    if(H5Gclose(gid) < 0) goto error;
+
+    /* Close file */
+    if(H5Fclose(fid) < 0) goto error;
+
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Dclose(gid);
+        H5Fclose(fid);
+    } H5E_END_TRY;
+    return 1;
+}
+