diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/html/RM_H5Z.html | 53 |
1 files changed, 38 insertions, 15 deletions
diff --git a/doc/html/RM_H5Z.html b/doc/html/RM_H5Z.html index b257609..4b08e69 100644 --- a/doc/html/RM_H5Z.html +++ b/doc/html/RM_H5Z.html @@ -115,30 +115,47 @@ as the corresponding C function. HDF5 supports a filter pipeline that provides the capability for standard and customized raw data processing during I/O operations. HDF5 is distributed with a small set of standard filters such as -compression (gzip and a shuffling algorithm) and +compression (gzip, SZIP, and a shuffling algorithm) and error checking (Fletcher32 checksum). For further flexibility, the library allows a user application to extend the pipeline through the creation and registration of customized filters. <p> -As mentioned above, one set of filters distributed with HDF5 provides -built-in methods for raw data compression. The flexibility of the filter pipeline implementation enables the definition of additional filters by a user application. -A filter<br> - — - is associated with a dataset when the dataset is created,<br> - — - can be used only with chunked data (ie., datasets stored in the - <code>H5D_CHUNKED</code> storage layout), and<br> - — - is applied independently to each chunk of the dataset. +A filter + <ul> + <li>is associated with a dataset when the dataset is created, + <li>can be used only with chunked data + (i.e., datasets stored in the <code>H5D_CHUNKED</code> + storage layout), and + <li>is applied independently to each chunk of the dataset. + </ul> <p> The HDF5 library does not support filters for contiguous datasets because of the difficulty of implementing random access for partial I/O. Compact dataset filters are not supported because it would not produce significant results. <p> +Filter identifiers for the filters distributed with the HDF5 Library +are as follows: +<table align=center border=0> + <tr valign=top align=left> + <td> + <code>H5Z_FILTER_DEFLATE</code></td><td>The gzip compression, + or deflation, filter + </td></tr><tr><td> + <code>H5Z_FILTER_SZIP</code></td><td>The SZIP compression filter + </td></tr><tr><td> + <code>H5Z_FILTER_SHUFFLE</code></td><td>The shuffle algorithm filter + </td></tr><tr><td> + <code>H5Z_FILTER_FLETCHER32 </code></td><td>The Fletcher32 checksum, + or error checking, filter + </td></tr> +</table> +Custom filters that have been registered with the library will have +additional unique identifiers. +<p> See <a href="Datasets.html"><cite>The Dataset Interface (H5D)</cite></a> in the <cite>HDF5 User's Guide</cite> for further information regarding data compression. @@ -160,7 +177,9 @@ data compression. <ul><table> <tr> <td valign="top"><em>H5Z_filter_t</em> <code>filter </code></td> - <td valign="top">IN: Filter identifier.</td></tr> + <td valign="top">IN: Filter identifier. + See the introduction to this section of the reference manual + for a list of valid filter identifiers</td></tr> </table></ul> <dt><strong>Returns:</strong> <dd>Returns a non-negative value if successful; @@ -175,8 +194,9 @@ SUBROUTINE h5zfilter_avail_f(filter, status, hdferr) ! H5Z_FILTER_DEFLATE_F ! H5Z_FILTER_SHUFFLE_F ! H5Z_FILTER_FLETCHER32_F + ! H5Z_FILTER_SZIP_F LOGICAL, INTENT(OUT) :: status ! Flag indicating whether - ! filter is availble: + ! filter is available: ! .TRUE. ! .FALSE. END SUBROUTINE h5zfilter_avail_f @@ -424,7 +444,9 @@ END SUBROUTINE h5zfilter_avail_f <ul><table> <tr> <td valign="top"><em>H5Z_filter_t</em> <code>filter </code></td> - <td valign="top">IN: Identifier of the filter to be unregistered.</td></tr> + <td valign="top">IN: Identifier of the filter to be unregistered. + See the introduction to this section of the reference manual + for a list of valid filter identifiers</td></tr> </table></ul> <dt><strong>Returns:</strong> <dd>Returns a non-negative value if successful; @@ -438,6 +460,7 @@ SUBROUTINE h5zunregister_f(filter, hdferr) ! H5Z_FILTER_DEFLATE_F ! H5Z_FILTER_SHUFFLE_F ! H5Z_FILTER_FLETCHER32_F + ! H5Z_FILTER_SZIP_F INTEGER, INTENT(OUT) :: hdferr ! Error code ! 0 on success, and -1 on failure END SUBROUTINE h5zunregister_f @@ -492,7 +515,7 @@ And in this document, the Describes HDF5 Release 1.7, the unreleased development branch; working toward HDF5 Release 1.8.0 </address><!-- #EndLibraryItem --><SCRIPT LANGUAGE="JAVASCRIPT"> <!-- -document.writeln("Last modified: 24 February 2004"); +document.writeln("Last modified: 1 July 2004"); --> </SCRIPT> |