Merge branch 'develop' of https://bitbucket.hdfgroup.org/scm/hdffv/hdf5 into merge_hyperslab_updates

1 files changed, 82 insertions, 11 deletions

diff --git a/hl/src/H5DO.c b/hl/src/H5DO.c
index e2b436a..99cf2f7 100644
--- a/hl/src/H5DO.c
+++ b/hl/src/H5DO.c
@@ -5,12 +5,10 @@
 *                                                                           *
 * 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.     *
+ * 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.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 #include <string.h>
@@ -34,7 +32,7 @@
  * Return:	Non-negative on success/Negative on failure
  *
  * Programmer:	Raymond Lu
- *		30 July 2012
+ *		        30 July 2012
  *
  *-------------------------------------------------------------------------
  */
@@ -62,7 +60,7 @@ H5DOwrite_chunk(hid_t dset_id, hid_t dxpl_id, uint32_t filters, const hsize_t *o
 
     /* If the user passed in a default DXPL, create one to pass to H5Dwrite() */
     if(H5P_DEFAULT == dxpl_id) {
-	if((dxpl_id = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        if((dxpl_id = H5Pcreate(H5P_DATASET_XFER)) < 0)
             goto done;
         created_dxpl = TRUE;
     } /* end if */
@@ -89,16 +87,87 @@ done:
         if(H5Pclose(dxpl_id) < 0)
             ret_value = FAIL;
     } /* end if */
-    else
+    else {
         /* Reset the direct write flag on user DXPL */
+        do_direct_write = FALSE;
         if(H5Pset(dxpl_id, H5D_XFER_DIRECT_CHUNK_WRITE_FLAG_NAME, &do_direct_write) < 0)
             ret_value = FAIL;
+    }
 
-    return(ret_value);
+    return ret_value;
 } /* end H5DOwrite_chunk() */
 
 
-/*
+/*-------------------------------------------------------------------------
+ * Function:    H5DOread_chunk
+ *
+ * Purpose:     Reads an entire chunk from the file directly.
+ *
+ * Return:      Non-negative on success/Negative on failure
+ *
+ * Programmer:  Matthew Strong (GE Healthcare)
+ *              14 February 2016
+ *
+ *---------------------------------------------------------------------------
+ */
+herr_t
+H5DOread_chunk(hid_t dset_id, hid_t dxpl_id, const hsize_t *offset, uint32_t *filters,
+         void *buf)
+{
+    hbool_t created_dxpl = FALSE;       /* Whether we created a DXPL */
+    hbool_t do_direct_read = TRUE;     /* Flag for direct writes */
+    herr_t  ret_value = FAIL;           /* Return value */
+
+    /* Check arguments */
+    if(dset_id < 0)
+        goto done;
+    if(!buf)
+        goto done;
+    if(!offset)
+        goto done;
+    if(!filters)
+        goto done;
+
+    /* If the user passed in a default DXPL, create one to pass to H5Dwrite() */
+    if(H5P_DEFAULT == dxpl_id) {
+        if((dxpl_id = H5Pcreate(H5P_DATASET_XFER)) < 0)
+            goto done;
+        created_dxpl = TRUE;
+    } /* end if */
+
+    /* Set direct write parameters */
+    if(H5Pset(dxpl_id, H5D_XFER_DIRECT_CHUNK_READ_FLAG_NAME, &do_direct_read) < 0)
+        goto done;
+    if(H5Pset(dxpl_id, H5D_XFER_DIRECT_CHUNK_READ_OFFSET_NAME, &offset) < 0)
+        goto done;
+
+    /* Read chunk */
+    if(H5Dread(dset_id, 0, H5S_ALL, H5S_ALL, dxpl_id, buf) < 0)
+        goto done;
+    /* Get the filter mask */
+    if(H5Pget(dxpl_id, H5D_XFER_DIRECT_CHUNK_READ_FILTERS_NAME, filters) < 0)
+        goto done;
+
+    /* Indicate success */
+    ret_value = SUCCEED;
+
+done:
+    if(created_dxpl) {
+        if(H5Pclose(dxpl_id) < 0)
+            ret_value = FAIL;
+    } /* end if */
+    else {
+        /* Reset the direct read flag on user DXPL */
+        do_direct_read = FALSE;
+        if(H5Pset(dxpl_id, H5D_XFER_DIRECT_CHUNK_READ_FLAG_NAME, &do_direct_read) < 0)
+            ret_value = FAIL;
+    }
+
+    return ret_value;
+} /* end H5DOread_chunk() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5DOappend()
  *
  * Purpose:     To append elements to a dataset.
@@ -124,6 +193,8 @@ done:
  *		  ret_value = FAIL;
  *		  goto done;
  *   		}
+ *
+ *-------------------------------------------------------------------------
  */
 herr_t
 H5DOappend(hid_t dset_id, hid_t dxpl_id, unsigned axis, size_t extension,