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authorFrank Baker <fbaker@hdfgroup.org>2003-02-11 17:09:25 (GMT)
committerFrank Baker <fbaker@hdfgroup.org>2003-02-11 17:09:25 (GMT)
commit905585f913a1f715cff7ff733b296b7d629a2aff (patch)
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[svn-r6393]
Purpose: To bring the H5Z_func_t definition from the old User's Guide into the Reference Manual. Description: Added custom filter function H5Z_func_t definition to the H5Zregister function description. This definition will next be edited to bring it up-to-date. Platforms tested: IE 5
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diff --git a/doc/html/RM_H5Z.html b/doc/html/RM_H5Z.html
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--- a/doc/html/RM_H5Z.html
+++ b/doc/html/RM_H5Z.html
@@ -103,6 +103,38 @@ data compression.
<p>
The statistics associated with a method number are not reset
by this function; they accumulate over the life of the library.
+
+ <p><strong>New filters</strong> are defined in two phases. Before a filter can be
+ linked into the application with <code>H5Zregister</code>,
+ <code>H5Z_func_t</code> must first be defined as follows:
+
+ <dir>
+ <em>typedef size_t</em> (*<code>H5Z_func_t</code>)
+ (<em>unsigned int</em> <code>flags</code>,
+ <em>size_t</em> <code>cd_nelmts</code>,
+ <em>const unsigned int</em> <code>cd_values[]</code>,
+ <em>size_t</em> <code>nbytes</code>,
+ <em>size_t *</em><code>buf_size</code>,
+ <em>void **</em><code>buf</code>)
+ </dir>
+
+ <p>The parameters <code>flags</code>, <code>cd_nelmts</code>,
+ and <code>cd_values</code> are the same as for the
+ <code>H5Pset_filter()</code> function.
+ The additional flag <code>H5Z_FLAG_REVERSE</code> is set when
+ the filter is called as part of the input pipeline.
+ The parameter <code>*buf</code> points to the input buffer
+ which has a total size of <code>*buf_size</code> bytes,
+ <code>nbytes</code> of which are valid data.
+ <p>The filter should perform the transformation in place if
+ possible and return the number of valid bytes or zero for
+ failure. If the transformation cannot be done in place,
+ then the filter should allocate a new buffer with
+ <code>malloc()</code> and assign it to <code>*buf</code>,
+ assigning the allocated size of that buffer to
+ <code>*buf_size</code>.
+ The old buffer should be freed by calling <code>free()</code>.
+
<dt><strong>Parameters:</strong>
<dl>
<dt><em>H5Z_method_t</em> <code>method</code>
@@ -159,7 +191,7 @@ H5Z&nbsp;&nbsp;
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
<br>
-Last modified: 3 July 2002
+Last modified: 11 February 2003
<br>
Describes HDF5 Release 1.5, Unreleased Development Branch