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Diffstat (limited to 'doc/html/Datatypes.html')
| -rw-r--r-- | doc/html/Datatypes.html | 80 |
1 files changed, 54 insertions, 26 deletions
diff --git a/doc/html/Datatypes.html b/doc/html/Datatypes.html index 9e566d5..6a368ff 100644 --- a/doc/html/Datatypes.html +++ b/doc/html/Datatypes.html @@ -2701,29 +2701,57 @@ hid_t dset4 = H5Dcreate (file, "dset4", t2, space, H5P_DEFAULT); conversion path, then the hard function is favored and when multiple soft functions apply, the one defined last is favored. - <p>A data conversion function is of type <code>H5T_conv_t</code> - which is defined as: + <p>A data conversion function is of type <code>H5T_conv_t</code>, + which is defined as follows: + +<dir><pre><em>typedef</em> herr_t (<em>*H5T_conv_t</em>) (hid_t <em>src_id</em>, + hid_t <em>dst_id</em>, + H5T_cdata_t *<em>cdata</em>, + hsize_t <em>nelmts</em>, + size_t <em>buf_stride</em>, + size_t <em>bkg_stride</em>, + void *<em>buffer</em>, + void *<em>bkg_buffer</em>, + hid_t <em>dset_xfer_plist</em>);</pre></dir> + - <p> - <code><pre> -typedef herr_t (*H5T_conv_t)(hid_t <em>src_type</em>, - hid_t <em>dest_type</em>, - H5T_cdata_t *<em>cdata</em>, - size_t <em>nelmts</em>, - void *<em>buffer</em>, - void *<em>background</em>); - </pre></code> - - <p>The conversion function is called with the source and - destination datatypes (<em>src_type</em> and - <em>dst_type</em>), path-constant data (<em>cdata</em>), the - number of instances of the datatype to convert - (<em>nelmts</em>), a buffer which initially contains an array of - data having the source type and on return will contain an array - of data having the destination type (<em>buffer</em>), and a - temporary or background buffer (<em>background</em>). Functions - return a negative value on failure and some other value on - success. + <p>The conversion function is called with + the source and destination datatypes (<em>src_id</em> and + <em>dst_id</em>), + the path-constant data struct (<em>cdata</em>), + the number of instances of the datatype to convert (<em>nelmts</em>), + a conversion buffer (<em>buffer</em>) which initially contains + an array of data having the source type and on return will + contain an array of data having the destination type, + a temporary or background buffer (<em>bkg_buffer</em>, + see description of <code>H5T_BKG_YES</code> below), + conversion and background buffer strides (<em>buf_stride</em> and + <em>bkg_stride</em>) that indicate what data is to be converted, and + a dataset transfer properties list (<em>dset_xfer_plist</em>). + Functions return a negative value on failure and + some other value on success. + + <p><em>buf_stride</em> and <em>bkg_stride</em> are in bytes and + are related to the size of the datatype. + If every data element is to be converted, the parameter's value + is equal to the size of the datatype; + if every other data element is to be converted, the parameter's value + is equal to twice the size of the datatype; etc. + + <p><em>dset_xfer_plist</em> may contain properties that are passed + to the read and write calls. + This parameter is currently used only with variable-length data. + + <p><em>bkg_buffer</em> and <em>bkg_stride</em> are used only with + compound datatypes. + + <p>The path-constant data struct, <code>H5T_cdata_t</code>, + is declared as follows: + +<dir><pre><em>typedef</em> struct <em>*H5T_cdata_t</em> (H5T_cmd_t <em>command</em>, + H5T_bkg_t <em>need_bkg</em>, + hbool_t *<em>recalc</em>, + void *<em>priv</em>)</pre></dir> <p>The <code>command</code> field of the <em>cdata</em> argument determines what happens within the conversion function. It's @@ -2883,9 +2911,9 @@ typedef herr_t (*H5T_conv_t)(hid_t <em>src_type</em>, 5 6 herr_t 7 cray_ushort2be (hid_t src, hid_t dst, - 8 H5T_cdata_t *cdata, - 9 size_t nelmts, void *buf, -10 const void *background) + 8 H5T_cdata_t *cdata, hsize_t nelmts, + 9 size_t buf_str, size_t bkg_str, void *buf, +10 const void *background, hid_t plist) 11 { 12 unsigned char *src = (unsigned char *)buf; 13 unsigned char *dst = src; @@ -3063,7 +3091,7 @@ H5Tregister(H5T_PERS_SOFT, "cus2be", <!-- Created: Thu Dec 4 14:57:32 EST 1997 --> <!-- hhmts start --> -Last modified: 16 February 2001 +Last modified: 20 July 2001 <!-- hhmts end --> <br> |