1 files changed, 93 insertions, 0 deletions
diff --git a/test/filter_plugin1_dsets.c b/test/filter_plugin1_dsets.c
new file mode 100644
index 0000000..b74e086
--- /dev/null
+++ b/test/filter_plugin1_dsets.c
@@ -0,0 +1,93 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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 dataset filter plugin for the filter_pluging.c test.
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "H5PLextern.h"
+
+#define FILTER1_ID              257
+
+static size_t add_sub_value(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              */
+    FILTER1_ID,                         /* Filter ID number                 */
+    1,                                  /* Encoding enabled                 */
+    1,                                  /* Decoding enabled                 */
+    "test filter plugin 1",             /* Filter name for debugging        */
+    NULL,                               /* The "can apply" callback         */
+    NULL,                               /* The "set local" callback         */
+    (H5Z_func_t)add_sub_value,          /* 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:	add_sub_value
+ *
+ * Purpose:     On write:
+ *                  Adds a caller-supplied value to the element
+ *              On read:
+ *                  Subtracts a caller-supplied value from the element
+ *
+ * Return:      Success:    Data chunk size in bytes
+ *              Failure:    0
+ *
+ *-------------------------------------------------------------------------
+ */
+static size_t
+add_sub_value(unsigned int flags, size_t cd_nelmts, const unsigned int *cd_values,
+        size_t nbytes, size_t *buf_size, void **buf)
+{
+    int *int_ptr = (int *)*buf;         /* Pointer to the data values               */
+    size_t buf_left = *buf_size;        /* Amount of data buffer left to process    */
+    int value = 0;                      /* Data value to add/subtract               */
+
+    /* Check for the correct number of parameters */
+    if (0 == cd_nelmts)
+        return 0;
+
+    /* Check that permanent parameters are set correctly */
+    if (cd_values[0] > 9)
+        return 0;
+  
+    value = (int)cd_values[0];
+
+    if (flags & H5Z_FLAG_REVERSE) {
+        /* READ - Substract the given value from all the data values */
+        while (buf_left > 0) {
+            *int_ptr++ -= value;
+            buf_left -= sizeof(int);
+        }
+    }
+    else {
+        /* WRITE - Add the given value to all the data values */
+        while (buf_left > 0) {
+            *int_ptr++ += value;
+            buf_left -= sizeof(int);
+        }
+    }
+
+    return nbytes;
+
+} /* end add_sub_value() */
+