[svn-r23346] First commit for DESY project. It has the basic functionality of loading dynamically filter libraries and a simple test for it.

Tested on koala.

test/plugin_lib/dynlib1.c

@@ -0,0 +1,73 @@
+#include "dynlib1.h"
+
+/* This message derives from H5Z */
+const H5Z_class2_t H5Z_DYNLIB1[1] = {{
+    H5Z_CLASS_T_VERS,                /* H5Z_class_t version             */
+    H5Z_FILTER_DYNLIB1,		     /* Filter id number		*/
+    1, 1,                            /* Encoding and decoding enabled   */
+    "dynlib1",			     /* Filter name for debugging	*/
+    NULL,                            /* The "can apply" callback        */
+    NULL,                            /* The "set local" callback        */
+    (H5Z_func_t)H5Z_filter_dynlib1,    /* The actual filter function	*/
+}};
+
+const H5PL_type_t   H5PL_get_plugin_type(void) {return H5PL_TYPE_FILTER;}
+const int           H5PL_get_plugin_version(void) {return (int)FILTER_DYNLIB1_VERS;}
+const char*         H5PL_get_plugin_name(void) {return "dynlib1";}
+const H5Z_class2_t* H5PL_get_plugin_info(void) {return H5Z_DYNLIB1;}
+
+/*-------------------------------------------------------------------------
+ * Function:	H5Z_filter_dynlib1
+ *
+ * Purpose:	A dynlib1 compression method that doesn't do anything.
+ *
+ * Return:	Success:	Data chunk size
+ *
+ *		Failure:	0
+ *
+ * Programmer:	Robb Matzke
+ *              Tuesday, April 21, 1998
+ *
+ *-------------------------------------------------------------------------
+ */
+static size_t
+H5Z_filter_dynlib1(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         add_on = 0;
+
+/*fprintf(stderr, "cd_nelmts=%d, cd_values=%d\n", cd_nelmts, cd_values[0]);*/
+    /* Check for the correct number of parameters */
+    if(cd_nelmts==0)
+        return(0);
+
+    /* Check that permanent parameters are set correctly */
+    if(cd_values[0]<0 || cd_values[0]>9)
+        return(0);
+  
+    add_on = cd_values[0];
+
+/*fprintf(stderr, "add_on=%d\n", add_on);*/
+
+    if(flags & H5Z_FLAG_REVERSE) { /*read*/
+        /* Substract the "add on" value to all the data values */
+        while(buf_left>0) {
+            *int_ptr++ -= add_on;
+            buf_left -= sizeof(int);
+        } /* end while */
+    } /* end if */
+    else { /*write*/
+        /* Add the "add on" value to all the data values */
+        while(buf_left>0) {
+            *int_ptr++ += add_on;
+            buf_left -= sizeof(int);
+        } /* end while */
+    } /* end else */
+
+/*fprintf(stderr, "nbytes=%d\n", nbytes);*/
+ 
+    return nbytes;
+}