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diff --git a/hl/src/H5DO.c b/hl/src/H5DO.c
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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+* Copyright by The HDF Group. *
+* 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://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
+* access to either file, you may request a copy from help@hdfgroup.org. *
+* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <stdio.h>
+
+#include "H5DOprivate.h"
+
+/*-------------------------------------------------------------------------
+ * Function: H5DOwrite_chunk
+ *
+ * Purpose: Writes an entire chunk to the file directly.
+ *
+ * Return: Non-negative on success/Negative on failure
+ *
+ * Programmer: Raymond Lu
+ * 30 July 2012
+ *
+ * Modifications:
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5DOwrite_chunk(hid_t dset_id, hid_t dxpl_id, uint32_t filters, hsize_t *offset,
+ size_t data_size, const void *buf)
+{
+ htri_t created_dxpl = FALSE;
+
+ if(dset_id < 0)
+ goto error;
+
+ if(!buf)
+ goto error;
+
+ if(!offset)
+ goto error;
+
+ if(!data_size)
+ goto error;
+
+ if(H5P_DEFAULT == dxpl_id) {
+ dxpl_id = H5Pcreate(H5P_DATASET_XFER);
+ created_dxpl = TRUE;
+ }
+
+ if(H5DO_write_chunk(dset_id, dxpl_id, filters, offset, data_size, buf) < 0)
+ goto error;
+
+ if(created_dxpl) {
+ if(H5Pclose(dxpl_id) < 0)
+ goto error;
+ }
+
+error:
+ return FAIL;
+}
+
+/*-------------------------------------------------------------------------
+ * Function: H5DO_write_chunk
+ *
+ * Purpose: Private function for H5DOwrite_chunk
+ *
+ * Return: Non-negative on success/Negative on failure
+ *
+ * Programmer: Raymond Lu
+ * 30 July 2012
+ *
+ * Modifications:
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5DO_write_chunk(hid_t dset_id, hid_t dxpl_id, uint32_t filters, hsize_t *offset,
+ size_t data_size, const void *buf)
+{
+ htri_t do_direct_write = TRUE;
+
+ if(H5Pset(dxpl_id, H5D_XFER_DIRECT_CHUNK_WRITE_FLAG_NAME, &do_direct_write) < 0)
+ goto error;
+
+ if(H5Pset(dxpl_id, H5D_XFER_DIRECT_CHUNK_WRITE_FILTERS_NAME, &filters) < 0)
+ goto error;
+
+ if(H5Pset(dxpl_id, H5D_XFER_DIRECT_CHUNK_WRITE_OFFSET_NAME, &offset) < 0)
+ goto error;
+
+ if(H5Pset(dxpl_id, H5D_XFER_DIRECT_CHUNK_WRITE_DATASIZE_NAME, &data_size) < 0)
+ goto error;
+
+ if(H5Dwrite(dset_id, 0, H5S_ALL, H5S_ALL, dxpl_id, buf) < 0)
+ goto error;
+
+ do_direct_write = FALSE;
+ if(H5Pset(dxpl_id, H5D_XFER_DIRECT_CHUNK_WRITE_FLAG_NAME, &do_direct_write) < 0)
+ goto error;
+
+error:
+ return FAIL;
+}