diff options
Diffstat (limited to 'doc/html')
| -rw-r--r-- | doc/html/RM_H5P.html | 448 |
1 files changed, 406 insertions, 42 deletions
diff --git a/doc/html/RM_H5P.html b/doc/html/RM_H5P.html index 450599c..1cf79d5 100644 --- a/doc/html/RM_H5P.html +++ b/doc/html/RM_H5P.html @@ -104,17 +104,16 @@ which require many different parameters to be easily manipulated. <li><a href="#Property-GetIstoreK">H5Pget_istore_k</a> </ul> - - -</td><td> </td><td valign=top> - - <i>File Close Properties</i> <ul> <li><a href="#Property-SetFcloseDegree">H5Pset_fclose_degree</a> <li><a href="#Property-GetfcloseDegree">H5Pget_fclose_degree</a> </ul> + + +</td><td> </td><td valign=top> + <p></p><i>File Access Properties</i> <ul> <li><a href="#Property-SetFaplCore">H5Pset_fapl_core</a> @@ -154,6 +153,20 @@ which require many different parameters to be easily manipulated. --> </ul> +<br> +<br> +<br> +<br> +<br> +<br> +<br> + || + <i>Indicates functions <br> + + available only in the <br> + + parallel HDF5 library.</i> + </td><td> </td><td valign=top> <i>Dataset Creation Properties</i> @@ -170,6 +183,11 @@ which require many different parameters to be easily manipulated. --> <li><a href="#Property-SetFillValue">H5Pset_fill_value</a> <li><a href="#Property-GetFillValue">H5Pget_fill_value</a> + <li><a href="#Property-FillValueDefined">H5Pfill_value_defined</a> + <li><a href="#Property-SetFillTime">H5Pset_fill_time</a> + <li><a href="#Property-GetFillTime">H5Pget_fill_time</a> + <li><a href="#Property-SetAllocTime">H5Pset_alloc_time</a> + <li><a href="#Property-GetAllocTime">H5Pget_alloc_time</a> <li><a href="#Property-SetFilter">H5Pset_filter</a> <li><a href="#Property-GetNFilters">H5Pget_nfilters</a> <li><a href="#Property-GetFilter">H5Pget_filter</a> @@ -204,12 +222,6 @@ which require many different parameters to be easily manipulated. <li><a href="#Property-GetSmallData">H5Pget_small_data_block_size</a> </ul> -<br> -<br> -|| <i>Indicates functions <br> - available only in the <br> - parallel HDF5 library.</i> - </td></tr> <!-- @@ -2835,35 +2847,57 @@ facilitate moving easily between them.</i> <em>const void *</em><code>value</code> ) <dt><strong>Purpose:</strong> - <dd>Sets a dataset fill value. + <dd>Sets the fill value for a dataset. <dt><strong>Description:</strong> - <dd><code>H5Pset_fill_value</code> sets the fill value for a - dataset creation property list. + <dd><code>H5Pset_fill_value</code> sets the fill value for + a dataset in the dataset creation property list. <p> - The <code>value</code> is interpreted as being of type - <code>type_id</code>. This need not be the same type - as the dataset, but the library must be able to convert - <code>value</code> to the dataset type when the dataset + <code>value</code> is interpreted as being of datatype + <code>type_id</code>. This datatype may differ from that of + the dataset, but the HDF5 library must be able to convert + <code>value</code> to the dataset datatype when the dataset is created. + <p> + The default fill value is <code>0</code> (zero), which is + interpreted according to the actual dataset datatype. + <p> + Setting <code>value</code> to <code>NULL</code> indicates + that the fill value is to be undefined. <dt><strong>Notes:</strong> - <dd>If a fill value is set for a dataset (even if the - fill value is all zeros), the fill value will be written - to the file. If no fill value is set, then HDF5 relies on - the underlying file driver (usually a Unix file system) - to initialize unwritten parts of the file to zeros. - <p> - Creating a contiguous dataset with a fill value can be a - very expensive operation since the optimization has not - yet been implemented that would delay the writing of the - fill values until after some data has been written. + <dd> Applications sometimes write data only to portions of + an allcoated dataset. It is often useful in such cases + to fill the unused space with a known + <span class="termEmphasis">fill value</span>. + This function allows the user application to set that fill value; + the functions + <a href="RM_H5D.html#Dataset-Fill">H5Dfill</a> and + <a href="RM_H5P.html#Property-SetFillTime">H5Pset_fill_time</a>, + respectively, provide the ability + to apply the fill value on demand or + to set up its automatic application. + <p> + A fill value should be defined so that it is appropriate for + the application. While the HDF5 default fill value is + <code>0</code> (zero), it is often appropriate to use another value. + It might be useful, for example, to use a value that is + known to be impossible for the application to legitimately generate. + <p> + <code>H5Pset_fill_value</code> is designed to work in + concert with <code>H5Pset_alloc_time</code> and + <code>H5Pset_fill_time</code>. + <code>H5Pset_alloc_time</code> and <code>H5Pset_fill_time</code> + govern the timing of dataset storage allocation and fill value + write operations and can be important in tuning application + performance. + <p> <dt><strong>Parameters:</strong> <dl> <dt><em>hid_t</em> <code>plist_id</code> - <dd>IN: Property list identifier. + <dd>IN: Dataset creation property list identifier. <dt><em>hid_t</em> <code>type_id</code>, - <dd>IN: The datatype identifier of <code>value</code>. + <dd>IN: Datatype of <code>value</code>. <dt><em>const void *</em><code>value</code> - <dd>IN: The fill value. + <dd>IN: Pointer to buffer containing value to use as fill value. </dl> <dt><strong>Returns:</strong> <dd>Returns a non-negative value if successful; @@ -2889,24 +2923,42 @@ facilitate moving easily between them.</i> <dt><strong>Purpose:</strong> <dd>Retrieves a dataset fill value. <dt><strong>Description:</strong> - <dd><code>H5Pget_fill_value</code> queries the - fill value property of a dataset creation property list. + <dd><code>H5Pget_fill_value</code> returns the dataset + fill value defined in the dataset creation property list + <code>plist_id</code>. <p> - The fill value is returned through the <code>value</code> - pointer. + The fill value is returned through the <code>value</code> + pointer and will be converted to the datatype specified + by <code>type_id</code>. + This datatype may differ from the + fill value datatype in the property list, + but the HDF5 library must be able to convert between the + two datatypes. <p> - Memory is allocated by the caller. + If the fill value is undefined, + i.e., set to <code>NULL</code> in the property list, + <code>H5Pget_fill_value</code> will return an error. + <code>H5Pfill_value_defined</code> should be used to + check for this condition before + <code>H5Pget_fill_value</code> is called. <p> - The fill value will be converted from its current - data type to the type specified by <code>type_id</code>. + Memory must be allocated by the calling application. + <dt><strong>Note:</strong> + <dd><code>H5Pget_fill_value</code> is designed to coordinate + with the dataset storage allocation time and + fill value write time properties, which can be retrieved + with the functions <code>H5Pget_alloc_time</code> + and <code>H5Pget_fill_time</code>, respectively. + <p> <dt><strong>Parameters:</strong> <dl> <dt><em>hid_t</em> <code>plist_id</code> - <dd>IN: Property list identifier. + <dd>IN: Dataset creation property list identifier. <dt><em>hid_t</em> <code>type_id</code>, - <dd>IN: The datatype identifier of <code>value</code>. + <dd>IN: Datatype identifier for the value passed + via <code>value</code>. <dt><em>const void *</em><code>value</code> - <dd>IN: The fill value. + <dd>OUT: Pointer to buffer to contain the returned fill value. </dl> <dt><strong>Returns:</strong> <dd>Returns a non-negative value if successful; @@ -2923,6 +2975,318 @@ facilitate moving easily between them.</i> + + +<hr> +<dl> + <dt><strong>Name:</strong> <a name="Property-FillValueDefined">H5Pfill_value_defined</a> + <dt><strong>Signature:</strong> + <dd><em>herr_t </em><code>H5Pfill_value_defined</code>(<em>hid_t</em> <code>plist_id</code>, + <em>H5D_fill_value_t *</em><code>status</code> + ) + <dt><strong>Purpose:</strong> + <dd>Determines whether fill value is defined. + <dt><strong>Description:</strong> + <dd><code>H5Pfill_value_defined</code> determines whether a fill value + is defined in the dataset creation property list <code>plist_id</code>. + <p> + Valid values returnrd in <code>status</code> are as follows: + <table border=0 width="80%"> + <tr valign="top"><td rowspan="3"> </td><td> + <code>H5D_FILL_VALUE_UNDEFINED</code> + </td><td> + Fill value is undefined. + </td></tr><tr valign="top"><td> + <code>H5D_FILL_VALUE_DEFAULT</code> + </td><td> + Fill value is the library default. + </td></tr><tr valign="top"><td> + <code>H5D_FILL_VALUE_USER_DEFINED</code> + </td><td> + Fill value is defined by the application. + </td></tr></table> + <dt><strong>Note:</strong> + <dd><code>H5Pfill_value_defined</code> is designed for use in + concert with the dataset fill value properties functions + <code>H5Pget_fill_value</code> and <code>H5Pget_fill_time</code>. + <p> + <dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>plist_id</code> + <dd>IN: Dataset creation property list identifier. + <dt><em>H5D_fill_value_t *</em><code>status</code> + <dd>OUT: Status of fill value in property list. + </dl> + <dt><strong>Returns:</strong> + <dd>Returns a non-negative value if successful; + otherwise returns a negative value. +<!-- + <dt><strong>Non-C API(s):</strong> + <dd><a href="fortran/h5p_FORTRAN.html#h5pset_layout_f" + target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a> + --> + <!-- + <img src="Graphics/Java.gif"> + <img src="Graphics/C++.gif"> + --> +</dl> + + +<hr> +<dl> + <dt><strong>Name:</strong> <a name="Property-SetFillTime">H5Pset_fill_time</a> + <dt><strong>Signature:</strong> + <dd><em>herr_t </em><code>H5Pset_fill_time</code>(<em>hid_t</em> <code>plist_id</code>, + <em>H5D_fill_time_t</em> <code>fill_time</code> + ) + <dt><strong>Purpose:</strong> + <dd>Sets the time when fill values are written to a dataset. + <dt><strong>Description:</strong> + <dd><code>H5Pset_fill_time</code> sets up the timing for writing fill values + to a dataset. + This property is set in the dataset creation property list <code>plist_id</code>. + <p> + Timing is specified in <code>fill_time</code> with one of the following values: + <table border=0 > + <tr valign="top"><td rowspan="2"> </td><td> + <code>H5D_FILL_TIME_ALLOC</code> + </td><td> + Write fill values to the dataset when storage space is allocated. + (Default) + </td></tr><tr valign="top"><td> + <code>H5D_FILL_TIME_NEVER</code> + </td><td> + Never write fill values to the dataset. + </td></tr></table> + <dt><strong>Note:</strong> + <dd><code>H5Pset_fill_time</code> is designed for coordination + with the dataset fill value and + dataset storage allocation time properties, set with the functions + <code>H5Pset_fill_value</code> and <code>H5Pset_alloc_time</code>. + <p> + <dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>plist_id</code> + <dd>IN: Dataset creation property list identifier. + <dt><em>H5D_fill_time_t</em> <code>fill_time</code> + <dd>IN: When to write fill values to a dataset. + </dl> + <dt><strong>Returns:</strong> + <dd>Returns a non-negative value if successful; + otherwise returns a negative value. +<!-- + <dt><strong>Non-C API(s):</strong> + <dd><a href="fortran/h5p_FORTRAN.html#h5pset_layout_f" + target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a> + --> + <!-- + <img src="Graphics/Java.gif"> + <img src="Graphics/C++.gif"> + --> +</dl> + + +<hr> +<dl> + <dt><strong>Name:</strong> <a name="Property-GetFillTime">H5Pget_fill_time</a> + <dt><strong>Signature:</strong> + <dd><em>herr_t </em><code>H5Pget_fill_time</code>(<em>hid_t</em> <code>plist_id</code>, + <em>H5D_fill_time_t *</em><code>fill_time</code> + ) + <dt><strong>Purpose:</strong> + <dd>Retrieves the time when fill value are written to a dataset. + <dt><strong>Description:</strong> + <dd><code>H5Pget_fill_time</code> examines the dataset creation + property list <code>plist_id</code> to determine when fill values + are to be written to a dataset. + <p> + Valid values returned in <code>fill_time</code> are as follows: + <table border=0 > + <tr valign="top"><td rowspan="2"> </td><td> + <code>H5D_FILL_TIME_ALLOC</code> + </td><td> + Fill values are written to the dataset when storage space is allocated. + (Default) + </td></tr><tr valign="top"><td> + <code>H5D_FILL_TIME_NEVER</code> + </td><td> + Fill values are never written to the dataset. + </td></tr></table> + <dt><strong>Note:</strong> + <dd><code>H5Pget_fill_time</code> is designed to work in coordination + with the dataset fill value and + dataset storage allocation time properties, retrieved with the functions + <code>H5Pget_fill_value</code> and <code>H5Pget_alloc_time</code>. + <p> + <dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>plist_id</code> + <dd>IN: Dataset creation property list identifier. + <dt><em>H5D_fill_time_t *</em><code>fill_time</code> + <dd>OUT: Setting for the timing of writing fill values to the dataset. + </dl> + <dt><strong>Returns:</strong> + <dd>Returns a non-negative value if successful; + otherwise returns a negative value. +<!-- + <dt><strong>Non-C API(s):</strong> + <dd><a href="fortran/h5p_FORTRAN.html#h5pset_layout_f" + target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a> + --> + <!-- + <img src="Graphics/Java.gif"> + <img src="Graphics/C++.gif"> + --> +</dl> + + +<hr> +<dl> + <dt><strong>Name:</strong> <a name="Property-SetAllocTime">H5Pset_alloc_time</a> + <dt><strong>Signature:</strong> + <dd><em>herr_t </em><code>H5Pset_alloc_time</code>(<em>hid_t</em> <code>plist_id</code>, + <em>H5D_alloc_time_t</em> <code>alloc_time</code> + ) + <dt><strong>Purpose:</strong> + <dd>Sets the timing for storage space allocation. + <dt><strong>Description:</strong> + <dd><code>H5Pset_alloc_time</code> sets up the timing for the allocation of + storage space for a dataset's raw data. + This property is set in the dataset creation property list + <code>plist_id</code>. + <p> + Timing is specified in <code>fill_time</code> with one of the + following values: + <table border=0 > + <tr valign="top"><td rowspan="4"> </td><td> + <code>H5D_ALLOC_TIME_DEFAULT</code> + </td><td> + Allocate dataset storage space at the default time.<br> + (Defaults differ by storage method.) + </td></tr><tr valign="top"><td> + <code>H5D_ALLOC_TIME_EARLY</code> + </td><td> + Allocate all space when the dataset is created.<br> + (Default for compact datasets.) + </td></tr><tr valign="top"><td> + <code>H5D_ALLOC_TIME_INCR</code> + </td><td> + Allocate space incrementally, as data is written to the dataset.<br> + (Default for chunked storage datasets.) + <li>Chunked datasets: + Storage space allocation for each chunk is deferred until data + is written to the chunk. + <li>Contiguous datasets: + Incremental storage space allocation for contiguous data + is treated as late allocation. + <li>Compact datasets: + Incremental allocation is not allowed with compact datasets; + </em><code>H5Pset_alloc_time</code> will return an error. + </td></tr><tr valign="top"><td> + <code>H5D_ALLOC_TIME_LATE</code> + </td><td> + Allocate all space when data is first written to the dataset.<br> + (Default for contiguous datasets.) + </td></tr></table> + <dt><strong>Note:</strong> + <dd><code>H5Pset_alloc_time</code> is designed to work in concert + with the dataset fill value and fill value write time properties, + set with the functions + <code>H5Pset_fill_value</code> and <code>H5Pset_fill_time</code>. + <p> + <dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>plist_id</code> + <dd>IN: Dataset creation property list identifier. + <dt><em>H5D_alloc_time_t</em> <code>alloc_time</code> + <dd>IN: When to allocate dataset storage space. + </dl> + <dt><strong>Returns:</strong> + <dd>Returns a non-negative value if successful; + otherwise returns a negative value. +<!-- + <dt><strong>Non-C API(s):</strong> + <dd><a href="fortran/h5p_FORTRAN.html#h5pset_layout_f" + target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a> + --> + <!-- + <img src="Graphics/Java.gif"> + <img src="Graphics/C++.gif"> + --> +</dl> + + +<hr> +<dl> + <dt><strong>Name:</strong> <a name="Property-GetAllocTime">H5Pget_alloc_time</a> + <dt><strong>Signature:</strong> + <dd><em>herr_t </em><code>H5Pget_alloc_time</code>(<em>hid_t</em> <code>plist_id</code>, + <em>H5D_alloc_time_t *</em><code>alloc_time</code> + ) + <dt><strong>Purpose:</strong> + <dd>Retrieves the timing for storage space allocation. + <dt><strong>Description:</strong> + <dd><code>H5Pget_alloc_time</code> retrieves the timing for allocating + storage space for a dataset's raw data. + This property is set in the dataset creation property list + <code>plist_id</code>. + <p> + The timing setting is returned in <code>fill_time</code> as one of the + following values: + <table border=0 > + <tr valign="top"><td rowspan="4"> </td><td> + <code>H5D_ALLOC_TIME_DEFAULT</code> + </td><td> + Uses the default allocation time, based on the dataset storage method.<br> + See the <code>fill_time</code> description in + <a href="#Property-SetAllocTime">H5Pset_alloc_time</a> for + default allocation times for various storage methods. + </td></tr><tr valign="top"><td> + <code>H5D_ALLOC_TIME_EARLY</code> + </td><td> + All space is allocated when the dataset is created. + </td></tr><tr valign="top"><td> + <code>H5D_ALLOC_TIME_INCR</code> + </td><td> + Space is allocated incrementally as data is written to the dataset. + </td></tr><tr valign="top"><td> + <code>H5D_ALLOC_TIME_LATE</code> + </td><td> + All space is allocated when data is first written to the dataset. + </td></tr></table> + <dt><strong>Note:</strong> + <dd><code>H5Pget_alloc_time</code> is designed to work in concert + with the dataset fill value and fill value write time properties, + set with the functions + <code>H5Pget_fill_value</code> and <code>H5Pget_fill_time</code>. + <p> + <dt><strong>Parameters:</strong> + <dl> + <dt><em>hid_t</em> <code>plist_id</code> + <dd>IN: Dataset creation property list identifier. + <dt><em>H5D_alloc_time_t *</em><code>alloc_time</code> + <dd>IN: When to allocate dataset storage space. + </dl> + <dt><strong>Returns:</strong> + <dd>Returns a non-negative value if successful; + otherwise returns a negative value. +<!-- + <dt><strong>Non-C API(s):</strong> + <dd><a href="fortran/h5p_FORTRAN.html#h5pset_layout_f" + target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a> + --> + <!-- + <img src="Graphics/Java.gif"> + <img src="Graphics/C++.gif"> + --> +</dl> + + + + + + + <hr> <dl> <dt><strong>Name:</strong> <a name="Property-SetFilter">H5Pset_filter</a> @@ -6307,7 +6671,7 @@ And in this document, the Describes HDF5 Release 1.5, Unreleased Development Branch </address><!-- #EndLibraryItem --> -Last modified: 20 March 2003 +Last modified: 28 March 2003 </body> </html> |