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If you do not have * - * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. * - * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * - --> - -<link href="ed_styles/RMelect.css" rel="stylesheet" type="text/css"> -<!-- #EndLibraryItem --></head> - -<body bgcolor="#FFFFFF"> -<!-- HEADER RIGHT " " --> - - -<!-- #BeginLibraryItem "/ed_libs/NavBar_RM.lbi" --><hr> -<center> -<table border=0 width=98%> -<tr><td valign=top align=left> -<a href="index.html">HDF5 documents and links</a> <br> -<a href="H5.intro.html">Introduction to HDF5</a> <br> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a> <br> -<!-- -<a href="Glossary.html">Glossary</a><br> ---> -</td> -<td valign=top align=right> -And in this document, the -<a href="RM_H5Front.html">HDF5 Reference Manual</a> -<br> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5im.html">H5IM</a> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5lt.html">H5LT</a> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5pt.html">H5PT</a> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5tb.html">H5TB</a> -<br> -<a href="RM_H5.html">H5</a> -<a href="RM_H5A.html">H5A</a> -<a href="RM_H5D.html">H5D</a> -<a href="RM_H5E.html">H5E</a> -<a href="RM_H5F.html">H5F</a> -<a href="RM_H5G.html">H5G</a> -<a href="RM_H5I.html">H5I</a> -<a href="RM_H5P.html">H5P</a> -<br> -<a href="RM_H5R.html">H5R</a> -<a href="RM_H5S.html">H5S</a> -<a href="RM_H5T.html">H5T</a> -<a href="RM_H5Z.html">H5Z</a> -<a href="Tools.html">Tools</a> -<a href="PredefDTypes.html">Datatypes</a> -</td></tr> -</table> -</center> -<hr><!-- #EndLibraryItem --><center> -<h1>H5Z: Filter and Compression Interface</h1> -</center> - -<h2>Filter and Compression API Functions</h2> - -These functions enable the user to configure new filters -for the local environment. - -<table border=0 width=80%> -<tr><td valign=top width="30%"> -<ul> - <li><a href="#Compression-FilterAvail">H5Zfilter_avail</a><br> - <li><a href="#Compression-GetFilterInfo">H5Zget_filter_info</a> -</ul> -</td><td> </td><td valign=top width="30%"> -<ul> - <li><a href="#Compression-Register">H5Zregister</a> -</ul> -</td><td> </td><td valign=top width="30%"> -<ul> - <li><a href="#Compression-Unregister">H5Zunregister</a> -</ul> -</td></tr> -</table> - -<br> -<strong>The FORTRAN90 Interfaces:</strong> -<br> -In general, each FORTRAN90 subroutine performs exactly the same task -as the corresponding C function. -<br> - -<table border=0 width=80%> -<tr><td valign=top width="30%"> - <ul> - <li><a href="#Compression-FilterAvail">h5zfilter_avail_f</a> - </ul> -</td><td> </td><td valign=top width="30%"> - <ul> -<!--<li><a href="#Compression-Register">h5zregister_f</a><br> --> - <li><a href="#Compression-GetFilterInfo">h5zget_filter_info_f</a> - </ul> -</td><td> </td><td valign=top width="30%"> - <ul> - <li><a href="#Compression-Unregister">h5zunregister_f</a> - </ul> -</td></tr> -</table> - -<p> -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, 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> -The flexibility of the filter pipeline implementation enables the -definition of additional filters by a user application. -A filter - <ul> - <li>is associated with a dataset when the dataset is created, - <li>can be used only with chunked data - <br>(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. - -<!-- NEW PAGE --> -<!-- HEADER RIGHT " " --> -<!-- NEW PAGE --> -<!-- HEADER RIGHT "H5Zfilter_avail" --> -<hr> -<dl> - <dt><strong>Name:</strong> <a name="Compression-FilterAvail">H5Zfilter_avail</a> - <dt><strong>Signature:</strong> - <dd><em>herr_t</em> <code>H5Zfilter_avail</code>(<em>H5Z_filter_t</em> <code>filter</code>) - <dt><strong>Purpose:</strong> - <dd>Determines whether a filter is available. - <dt><strong>Description:</strong> - <dd><code>H5Zfilter_avail</code> determines whether the filter - specified in <code>filter</code> is available to the application. - <dt><strong>Parameters:</strong> - <ul><table> - <tr> - <td valign="top"><em>H5Z_filter_t</em> <code>filter </code></td> - <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; - otherwise returns a negative value. - <dt><strong>Fortran90 Interface:</strong> h5zfilter_avail_f - <dd> - <pre> -SUBROUTINE h5zfilter_avail_f(filter, status, hdferr) - IMPLICIT NONE - INTEGER, INTENT(IN) :: filter ! Filter - ! Valid values are: - ! 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 available: - ! .TRUE. - ! .FALSE. -END SUBROUTINE h5zfilter_avail_f - </pre> - - <!--<dt><strong>Non-C API(s):</strong> - <dd> - - <img src="Graphics/Java.gif"> - <img src="Graphics/C++.gif"> - --> -</dl> - - -<!-- NEW PAGE --> -<!-- HEADER RIGHT "H5Zget_filter_info" --> -<hr> -<dl> -<dt><strong>Name:</strong> <a name="Compression-GetFilterInfo">H5Zget_filter_info</a> -<dt><strong>Signature:</strong> - <dd><em>herr_t</em> - <code>H5Zget_filter_info</code>( - <em>H5Z_filter_t</em> <code>filter</code>, - <em>unsigned int *</em><code>filter_config_flags</code> - ) -<dt><strong>Purpose:</strong> - <dd>Retrieves information about a filter. -<dt><strong>Description:</strong> - <dd> - <code>H5Zget_filter_info</code> retrieves information about a filter. - At present, this means that the function retrieves a - filter's configuration flags, indicating whether the filter is - configured to decode data, to encode data, neither, or both. - <p> - If <code>filter_config_flags</code> is not set to <small>NULL</small> - prior to the function call, the returned parameter contains a - bit field specifying the available filter configuration. - The configuration flag values can then be determined through - a series of bitwise <small>AND</small> operations, as described below. - <p> - Valid filter configuration flags include the following: - <table> - <tr><td><code> </code></td> - <td><code>H5Z_FILTER_CONFIG_ENCODE_ENABLED</code></td> - <td>Encoding is enabled for this filter - </td></tr> - <tr><td> </td> - <td><code>H5Z_FILTER_CONFIG_DECODE_ENABLED</code> </td> - <td>Decoding is enabled for this filter - </td></tr> - <tr><td> </td> - <td colspan="2" align="right"><small>(These flags - are defined in the HDF5 Library source code file - <code>H5Zpublic.h</code>.)</small> - </td></tr> - </table> - A bitwise <small>AND</small> of the returned - <code>filter_config_flags</code> and a valid - filter configuration flag will reveal whether - the related configuration option is available. - For example, if the value of - <br> - <code> - H5Z_FILTER_CONFIG_ENCODE_ENABLED - & - filter_config_flags</code> - <br> - is true, i.e., greater than <code>0</code> (zero), - the queried filter is configured to encode data; - if the value is <code>FALSE</code>, - i.e., equal to <code>0</code> (zero), - the filter is not so configured. - <p> - If a filter is not encode-enabled, the corresponding - <code>H5Pset_*</code> function will return an error if the - filter is added to a dataset creation property list (which is - required if the filter is to be used to encode that dataset). - For example, if the <code>H5Z_FILTER_CONFIG_ENCODE_ENABLED</code> - flag is not returned for the SZIP filter, - <code>H5Z_FILTER_SZIP</code>, a call to <code>H5Pset_szip</code> - will fail. - <p> - If a filter is not decode-enabled, the application will not be - able to read an existing file encoded with that filter. - <p> - This function should be called, and the returned - <code>filter_config_flags</code> analyzed, before calling - any other function, such as <code>H5Pset_szip</code>, - that might require a particular filter configuration. - -<dt><strong>Parameters:</strong> - <dl> - <dt><em>H5Z_filter_t</em> <code>filter</code> - <dd>IN: Identifier of the filter to query. - See the introduction to this section of the reference manual - for a list of valid filter identifiers. - <dt><em>unsigned int *</em><code>filter_config_flags</code> - <dd>OUT: A bit field encoding the returned filter information - </dl> -<dt><strong>Returns:</strong> - <dd>Returns a non-negative value on success, - a negative value on failure. - -<!-- NEW PAGE --> -<dt><strong>Fortran90 Interface:</strong> - <dd> - <pre> -SUBROUTINE h5zget_filter_info_f(filter, config_flags, hdferr) - - IMPLICIT NONE - INTEGER, INTENT(IN) :: filter ! Filter, may be one of the - ! following: - ! H5Z_FILTER_DEFLATE_F - ! H5Z_FILTER_SHUFFLE_F - ! H5Z_FILTER_FLETCHER32_F - ! H5Z_FILTER_SZIP_F - INTEGER, INTENT(OUT) :: config_flags ! Bit field indicating whether - ! a filter's encoder and/or - ! decoder are available - INTEGER, INTENT(OUT) :: hdferr ! Error code - -END SUBROUTINE h5zfilter_avail_f - </pre> - <!--<dt><strong>Non-C API(s):</strong> - <dd> - - <img src="Graphics/Java.gif"> - <img src="Graphics/C++.gif"> - --> -</dl> - - -<!-- NEW PAGE --> -<!-- HEADER RIGHT "H5Zregister" --> -<hr> -<dl> -<dt><strong>Name:</strong> <a name="Compression-Register">H5Zregister</a> -<dt><strong>Signature:</strong> - <dd><em>herr_t</em> <code>H5Zregister</code>(<em>const H5Z_class_t</em> <code>filter_class</code>) - ) -<dt><strong>Purpose:</strong> - <dd>Registers new filter. -<dt><strong>Description:</strong> - <dd><code>H5Zregister</code> registers a new filter with the - HDF5 library. - <p> - Making a new filter available to an application is a two-step - process. The first step is to write - the three filter callback functions described below: - <code>can_apply_func</code>, <code>set_local_func</code>, and - <code>filter_func</code>. - This call to <code>H5Zregister</code>, - <span class="termEmphasis">registering</span> the filter with the - library, is the second step. - The <code>can_apply_func</code> and <code>set_local_func</code> - fields can be set to <code>NULL</code> - if they are not required for the filter being registered. - <p> - <code>H5Zregister</code> accepts a single parameter, - the <code>filter_class</code> data structure, - which is defined as follows: - <pre> - typedef struct H5Z_class_t { - H5Z_filter_t filter_id; - const char *comment; - H5Z_can_apply_func_t can_apply_func; - H5Z_set_local_func_t set_local_func; - H5Z_func_t filter_func; - } H5Z_class_t; - </pre> - - <p> - <code>filter_id</code> is the identifier for the new filter. - This is a user-defined value between - <code>H5Z_FILTER_RESERVED</code> and <code>H5Z_FILTER_MAX</code>, - both of which are defined in the HDF5 source file - <code>H5Zpublic.h</code>. - <p> - <code>comment</code> is used for debugging, - may contain a descriptive name for the filter, - and may be the null pointer. - <p> - <code>can_apply_func</code>, described in detail below, - is a user-defined callback function which determines whether - the combination of the dataset creation property list values, - the datatype, and the dataspace represent a valid combination - to apply this filter to. - <p> - <code>set_local_func</code>, described in detail below, - is a user-defined callback function which sets any parameters that - are specific to this dataset, based on the combination of the - dataset creation property list values, the datatype, and the - dataspace. - <p> - <code>filter_func</code>, described in detail below, - is a user-defined callback function which performs the action - of the filter. - <p> - The statistics associated with a filter are not reset - by this function; they accumulate over the life of the library. - - <p> - <strong>The callback functions</strong> - <br> - Before <code>H5Zregister</code> can link a filter into an - application, three callback functions must be defined - as described in the HDF5 Library header file <code>H5Zpublic.h</code>. - - <p> - <u>The <i>can apply</i> callback function</u> is defined as follows:<br> - <dir> - <em>typedef herr_t</em> (*<code>H5Z_can_apply_func_t</code>) - (<em>hid_t</em> <code>dcpl_id</code>, - <em>hid_t</em> <code>type_id</code>, - <em>hid_t</em> <code>space_id</code>) - </dir> - <p> - Before a dataset is created, the <i>can apply</i> callbacks for - any filters used in the dataset creation property list are called - with the dataset's dataset creation property list, <code>dcpl_id</code>, - the dataset's datatype, <code>type_id</code>, and - a dataspace describing a chunk, <code>space_id</code>, - (for chunked dataset storage). - <p> - This callback must determine whether the combination of the - dataset creation property list settings, the datatype, and the - dataspace represent a valid combination to which to apply this filter. - For example, an invalid combination may involve - the filter not operating correctly on certain datatypes, - on certain datatype sizes, or on certain sizes of the chunk dataspace. - <p> - This callback can be the <code>NULL</code> pointer, in which case - the library will assume that the filter can be applied to a dataset with - any combination of dataset creation property list values, datatypes, - and dataspaces. - <p> - The <i>can apply</i> callback function must return - a positive value for a valid combination, - zero for an invalid combination, and - a negative value for an error. - - <p> - <u>The <i>set local</i> callback function</u> is defined as follows:<br> - <dir> - <em>typedef herr_t</em> (*<code>H5Z_set_local_func_t</code>) - (<em>hid_t</em> <code>dcpl_id</code>, - <em>hid_t</em> <code>type_id</code>, - <em>hid_t</em> <code>space_id</code>) - </dir> - <p> - After the <i>can apply</i> callbacks are checked for a new dataset, - the <i>set local</i> callback functions for any filters used in the - dataset creation property list are called. - These callbacks receive - <code>dcpl_id</code>, the dataset's private copy of the dataset - creation property list passed in to <code>H5Dcreate</code> - (i.e. not the actual property list passed in to <code>H5Dcreate</code>); - <code>type_id</code>, the datatype identifier passed in to - <code>H5Dcreate</code>, - which is not copied and should not be modified; and - <code>space_id</code>, a dataspace describing the chunk - (for chunked dataset storage), which should also not be modified. - <p> - The <i>set local</i> callback must set any filter parameters that are - specific to this dataset, based on the combination of the - dataset creation property list values, the datatype, and the dataspace. - For example, some filters perform different actions based on - different datatypes, datatype sizes, numbers of dimensions, - or dataspace sizes. - <p> - The <i>set local</i> callback may be the <code>NULL</code> pointer, - in which case, the library will assume that there are - no dataset-specific settings for this filter. - <p> - The <i>set local</i> callback function must return - a non-negative value on success and - a negative value for an error. - - <p> - <u>The <i>filter operation</i> callback function</u>, - defining the filter's operation on the data, is 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 function - <a href="RM_H5P.html#Property-SetFilter"><code>H5Pset_filter</code></a>. - The one exception is that an additional flag, - <code>H5Z_FLAG_REVERSE</code>, is set when - the filter is called as part of the input pipeline. - <p> - The parameter <code>*buf</code> points to the input buffer - which has a 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. 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>. - <p> - If successful, the <i>filter operation</i> callback function - returns the number of valid bytes of data contained in <code>*buf</code>. - In the case of failure, the return value is <code>0</code> (zero) - and all pointer arguments are left unchanged. -<dt><strong>Note:</strong> - <dd>The <code>H5Zregister</code> interface is substantially revised - from the HDF5 Release 1.4.x series. - The <code>H5Z_class_t</code> struct and - the <i>set local</i> and <i>can apply</i> callback functions - first appeared in HDF5 Release 1.6. -<dt><strong>Parameters:</strong> - <ul><table> - <tr> - <td valign="top"><em>const H5Z_class_t</em> <code>filter_class </code></td> - <td valign="top">IN: Struct containing filter-definition information.</td></tr> - </table></ul> -<dt><strong>Returns:</strong> - <dd>Returns a non-negative value if successful; - otherwise returns a negative value. -<dt><strong>Fortran90 Interface:</strong> - <dd>None. -<!-- - <pre> - - </pre> ---> - - <!--<dt><strong>Non-C API(s):</strong> - <dd> - - <img src="Graphics/Java.gif"> - <img src="Graphics/C++.gif"> - --> -</dl> - -<!-- NEW PAGE --> -<!-- HEADER RIGHT "H5Zunregister" --> -<hr> -<dl> - <dt><strong>Name:</strong> <a name="Compression-Unregister">H5Zunregister</a> - <dt><strong>Signature:</strong> - <dd><em>herr_t</em> <code>H5Zunregister</code>(<em>H5Z_filter_t</em> <code>filter</code>) - <dt><strong>Purpose:</strong> - <dd>Unregisters a filter. - <dt><strong>Description:</strong> - <dd><code>H5Zunregister</code> unregisters the filter - specified in <code>filter</code>. - <p> - After a call to <code>H5Zunregister</code>, the filter - specified in <code>filter</code> will no longer be - available to the application. - <dt><strong>Parameters:</strong> - <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. - See the introduction to this section of the reference manual - for a list of identifiers for standard filters - distributed with the HDF5 Library.</td></tr> - </table></ul> - <dt><strong>Returns:</strong> - <dd>Returns a non-negative value if successful; - otherwise returns a negative value. - <dt><strong>Fortran90 Interface:</strong> h5zunregister_f - <dd> - <pre> -SUBROUTINE h5zunregister_f(filter, hdferr) - IMPLICIT NONE - INTEGER, INTENT(IN) :: filter ! Filter; one of the possible values: - ! 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 - </pre> - - <!--<dt><strong>Non-C API(s):</strong> - <dd> - - <img src="Graphics/Java.gif"> - <img src="Graphics/C++.gif"> - --> -</dl> - -<!-- HEADER RIGHT " " --> - -<!-- #BeginLibraryItem "/ed_libs/NavBar_RM.lbi" --><hr> -<center> -<table border=0 width=98%> -<tr><td valign=top align=left> -<a href="index.html">HDF5 documents and links</a> <br> -<a href="H5.intro.html">Introduction to HDF5</a> <br> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a> <br> -<!-- -<a href="Glossary.html">Glossary</a><br> ---> -</td> -<td valign=top align=right> -And in this document, the -<a href="RM_H5Front.html">HDF5 Reference Manual</a> -<br> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5im.html">H5IM</a> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5lt.html">H5LT</a> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5pt.html">H5PT</a> -<a href="http://hdf.ncsa.uiuc.edu/HDF5/hdf5_hl/doc/RM_hdf5tb.html">H5TB</a> -<br> -<a href="RM_H5.html">H5</a> -<a href="RM_H5A.html">H5A</a> -<a href="RM_H5D.html">H5D</a> -<a href="RM_H5E.html">H5E</a> -<a href="RM_H5F.html">H5F</a> -<a href="RM_H5G.html">H5G</a> -<a href="RM_H5I.html">H5I</a> -<a href="RM_H5P.html">H5P</a> -<br> -<a href="RM_H5R.html">H5R</a> -<a href="RM_H5S.html">H5S</a> -<a href="RM_H5T.html">H5T</a> -<a href="RM_H5Z.html">H5Z</a> -<a href="Tools.html">Tools</a> -<a href="PredefDTypes.html">Datatypes</a> -</td></tr> -</table> -</center> -<hr><!-- #EndLibraryItem --><!-- #BeginLibraryItem "/ed_libs/Footer.lbi" --><address> -<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a> -<br> -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: 2 September 2004"); ---> -</SCRIPT> - -</body> -</html> |