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author Chris Cannam
date Wed, 07 Sep 2016 10:40:32 +0100
parents 26056e866c29
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Chris@19 1 <html lang="en">
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Chris@19 3 <title>Wisdom Import - FFTW 3.3.4</title>
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Chris@19 9 <link rel="prev" href="Wisdom-Export.html#Wisdom-Export" title="Wisdom Export">
Chris@19 10 <link rel="next" href="Forgetting-Wisdom.html#Forgetting-Wisdom" title="Forgetting Wisdom">
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Chris@19 12 <!--
Chris@19 13 This manual is for FFTW
Chris@19 14 (version 3.3.4, 20 September 2013).
Chris@19 15
Chris@19 16 Copyright (C) 2003 Matteo Frigo.
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Chris@19 18 Copyright (C) 2003 Massachusetts Institute of Technology.
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Chris@19 26 that the entire resulting derived work is distributed under the
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Chris@19 29 Permission is granted to copy and distribute translations of this
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Chris@19 46 </head>
Chris@19 47 <body>
Chris@19 48 <div class="node">
Chris@19 49 <a name="Wisdom-Import"></a>
Chris@19 50 <p>
Chris@19 51 Next:&nbsp;<a rel="next" accesskey="n" href="Forgetting-Wisdom.html#Forgetting-Wisdom">Forgetting Wisdom</a>,
Chris@19 52 Previous:&nbsp;<a rel="previous" accesskey="p" href="Wisdom-Export.html#Wisdom-Export">Wisdom Export</a>,
Chris@19 53 Up:&nbsp;<a rel="up" accesskey="u" href="Wisdom.html#Wisdom">Wisdom</a>
Chris@19 54 <hr>
Chris@19 55 </div>
Chris@19 56
Chris@19 57 <h4 class="subsection">4.7.2 Wisdom Import</h4>
Chris@19 58
Chris@19 59 <pre class="example"> int fftw_import_system_wisdom(void);
Chris@19 60 int fftw_import_wisdom_from_filename(const char *filename);
Chris@19 61 int fftw_import_wisdom_from_string(const char *input_string);
Chris@19 62 int fftw_import_wisdom(int (*read_char)(void *), void *data);
Chris@19 63 </pre>
Chris@19 64 <p><a name="index-fftw_005fimport_005fwisdom-285"></a><a name="index-fftw_005fimport_005fsystem_005fwisdom-286"></a><a name="index-fftw_005fimport_005fwisdom_005ffrom_005ffilename-287"></a><a name="index-fftw_005fimport_005fwisdom_005ffrom_005ffile-288"></a><a name="index-fftw_005fimport_005fwisdom_005ffrom_005fstring-289"></a>
Chris@19 65 These functions import wisdom into a program from data stored by the
Chris@19 66 <code>fftw_export_wisdom</code> functions above. (See <a href="Words-of-Wisdom_002dSaving-Plans.html#Words-of-Wisdom_002dSaving-Plans">Words of Wisdom-Saving Plans</a>.) The imported wisdom replaces any wisdom
Chris@19 67 already accumulated by the running program.
Chris@19 68
Chris@19 69 <p><code>fftw_import_wisdom</code> imports wisdom from any input medium, as
Chris@19 70 specified by the callback function <code>read_char</code>. <code>read_char</code> is
Chris@19 71 a <code>getc</code>-like function that returns the next character in the
Chris@19 72 input; its parameter is the <code>data</code> pointer passed to
Chris@19 73 <code>fftw_import_wisdom</code>. If the end of the input data is reached
Chris@19 74 (which should never happen for valid data), <code>read_char</code> should
Chris@19 75 return <code>EOF</code> (as defined in <code>&lt;stdio.h&gt;</code>). For convenience,
Chris@19 76 the following three &ldquo;wrapper&rdquo; routines are provided:
Chris@19 77
Chris@19 78 <p><code>fftw_import_wisdom_from_filename</code> reads wisdom from a file named
Chris@19 79 <code>filename</code>. A lower-level function, which requires you to open
Chris@19 80 and close the file yourself (e.g. if you want to read wisdom from a
Chris@19 81 portion of a larger file) is <code>fftw_import_wisdom_from_file</code>. This
Chris@19 82 reads wisdom from the current position in <code>input_file</code> (which
Chris@19 83 should be open with read permission); upon exit, the file remains
Chris@19 84 open, but the position of the read pointer is unspecified.
Chris@19 85
Chris@19 86 <p><code>fftw_import_wisdom_from_string</code> reads wisdom from the
Chris@19 87 <code>NULL</code>-terminated string <code>input_string</code>.
Chris@19 88
Chris@19 89 <p><code>fftw_import_system_wisdom</code> reads wisdom from an
Chris@19 90 implementation-defined standard file (<code>/etc/fftw/wisdom</code> on Unix
Chris@19 91 and GNU systems).
Chris@19 92 <a name="index-wisdom_002c-system_002dwide-290"></a>
Chris@19 93
Chris@19 94 <p>The return value of these import routines is <code>1</code> if the wisdom was
Chris@19 95 read successfully and <code>0</code> otherwise. Note that, in all of these
Chris@19 96 functions, any data in the input stream past the end of the wisdom data
Chris@19 97 is simply ignored.
Chris@19 98
Chris@19 99 <!-- =========> -->
Chris@19 100 </body></html>
Chris@19 101