1 files changed, 106 insertions, 0 deletions
diff --git a/test/filter_plugin4_groups.c b/test/filter_plugin4_groups.c
new file mode 100644
index 0000000..88ea20d
--- /dev/null
+++ b/test/filter_plugin4_groups.c
@@ -0,0 +1,106 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * 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 COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:	Test group filter plugin for the filter_pluging.c test.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "H5PLextern.h"
+
+#define FILTER4_ID              260
+#define SUFFIX_LEN              8
+#define GROUP_SUFFIX            ".h5group"
+
+static size_t append_to_group_name(unsigned int flags, size_t cd_nelmts,
+        const unsigned int *cd_values, size_t nbytes, size_t *buf_size, void **buf);
+
+/* Filter class struct */
+const H5Z_class2_t FILTER_INFO[1] = {{
+    H5Z_CLASS_T_VERS,                   /* H5Z_class_t version              */
+    FILTER4_ID,                         /* Filter ID number                 */
+    1,                                  /* Encoding enabled                 */
+    1,                                  /* Decoding enabled                 */
+    "test filter plugin 4",             /* Filter name for debugging        */
+    NULL,                               /* The "can apply" callback         */
+    NULL,                               /* The "set local" callback         */
+    (H5Z_func_t)append_to_group_name,   /* The actual filter function       */
+}};
+
+H5PL_type_t   H5PLget_plugin_type(void) {return H5PL_TYPE_FILTER;}
+const void    *H5PLget_plugin_info(void) {return FILTER_INFO;}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	append_to_group_name
+ *
+ * Purpose:     On write:
+ *                  Appends the suffix ".h5group" to the group name
+ *              On read:
+ *                  Removes the ".h5group" suffix from the group name
+ *
+ * Return:      Success:    Data size in bytes
+ *              Failure:    0
+ *
+ *-------------------------------------------------------------------------
+ */
+static size_t
+append_to_group_name(unsigned int flags, size_t cd_nelmts,
+        const unsigned int *cd_values, size_t nbytes, size_t *buf_size, void **buf)
+{
+    size_t   new_name_size = 0;             /* Return value */
+
+    /* Check for the correct number of parameters */
+    if (cd_nelmts > 0)
+        return 0;
+
+    /* Assignment to eliminate unused parameter warning. */
+    cd_values = cd_values;
+
+    if (flags & H5Z_FLAG_REVERSE) {
+        /* READ - Remove the suffix from the group name */
+        new_name_size = *buf_size = nbytes - SUFFIX_LEN;
+    }
+    else {
+        /* WRITE - Append the suffix to the group name */
+        void    *outbuf = NULL;         /* Pointer to new buffer                    */
+        unsigned char *dst = NULL;      /* Temporary pointer to destination buffer  */
+
+        /* Get memory for the new, larger string buffer using the
+         * library's memory allocator.
+         */
+        if (NULL == (dst = (unsigned char *)(outbuf = H5allocate_memory(nbytes + SUFFIX_LEN, 0))))
+            return 0;
+
+        /* Copy raw data */
+        memcpy((void *)dst, (const void *)(*buf), nbytes);
+
+        /* Append suffix to raw data for storage */
+        dst += nbytes;
+        memcpy((void *)dst, (const void *)GROUP_SUFFIX, SUFFIX_LEN);
+
+        /* Free the passed-in buffer using the library's allocator */
+        H5free_memory(*buf);
+
+        /* Set return values */
+        *buf_size = nbytes + SUFFIX_LEN;
+        *buf = outbuf;
+        outbuf = NULL;
+        new_name_size = *buf_size;
+    }
+
+    return new_name_size;
+} /* append_to_group_name() */
+