[svn-r14307] Description:

    - Extracted common code from H5D_select_read/H5D_select_write into single
        routine (H5D_select_io) and made H5D_select_read/H5D_select_write
        "gateway" routines, passing I/O buffer to operate on in "op" struct.
    - Create optimized pathway in H5D_select_io for I/O operations on single
        elements.
    - Make "get linear offset of first element" callback for each type of
        selection (used in "optimized pathway", above)

Tested on:
        FreeBSD/32 6.2 (duty) in debug mode
        FreeBSD/64 6.2 (liberty) w/C++ & FORTRAN, in debug mode
        Linux/32 2.6 (kagiso) w/PGI compilers, w/C++ & FORTRAN, w/threadsafe,
                                in debug mode
        Linux/64-amd64 2.6 (smirom) w/default API=1.6.x, w/C++ & FORTRAN,
                                in production mode
        Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
                                in production mode
        Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
                                w/szip filter, in production mode
        Mac OS X/32 10.4.10 (amazon) in debug mode
        Linux/64-ia64 2.4 (tg-login3) w/parallel, w/FORTRAN, in production mode

1 files changed, 40 insertions, 0 deletions

diff --git a/src/H5Sselect.c b/src/H5Sselect.c
index 31fd05e..eba17a8 100644
--- a/src/H5Sselect.c
+++ b/src/H5Sselect.c
@@ -579,6 +579,46 @@ H5S_get_select_bounds(const H5S_t *space, hsize_t *start, hsize_t *end)
 
 /*--------------------------------------------------------------------------
  NAME
+    H5S_get_select_offset
+ PURPOSE
+    Gets the linear offset of the first element for the selection.
+ USAGE
+    herr_t H5S_get_select_offset(space, offset)
+        const H5S_t *space;     IN: Dataspace pointer of selection to query
+        hsize_t *offset;        OUT: Linear offset of first element in selection
+ RETURNS
+    Non-negative on success, negative on failure
+ DESCRIPTION
+    Retrieves the linear offset (in "units" of elements) of the first element
+    selected within the dataspace.
+ GLOBAL VARIABLES
+ COMMENTS, BUGS, ASSUMPTIONS
+        The offset calculation _does_ include the current offset of the
+    selection within the dataspace extent.
+
+        Calling this function on a "none" selection returns fail.
+ EXAMPLES
+ REVISION LOG
+--------------------------------------------------------------------------*/
+herr_t
+H5S_get_select_offset(const H5S_t *space, hsize_t *offset)
+{
+    herr_t ret_value;        /* return value */
+
+    FUNC_ENTER_NOAPI_NOFUNC(H5S_get_select_offset)
+
+    /* Check args */
+    HDassert(space);
+    HDassert(offset);
+
+    ret_value = (*space->select.type->offset)(space, offset);
+
+    FUNC_LEAVE_NOAPI(ret_value)
+}   /* H5S_get_select_offset() */
+
+
+/*--------------------------------------------------------------------------
+ NAME
     H5S_select_is_contiguous
  PURPOSE
     Determines if a selection is contiguous in the dataspace