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| <h1 id="fmemopen-for-mac-os-and-ios">fmemopen for Mac OS and iOS</h1> |
| <p>Originally ported from <a href="https://github.com/ingenuitas/python-tesseract/blob/master/fmemopen.c">ingenuitas python-tesseract</a>. Ported by Jeff Verkoeyen under the Apache 2.0 License.</p> |
| <p>From the fmemopen man page:</p> |
| <blockquote> |
| <p>FILE *fmemopen(void *buf, size_t size, const char *mode);</p> |
| <p>The fmemopen() function opens a stream that permits the access specified by mode. The stream |
| allows I/O to be performed on the string or memory buffer pointed to by buf. This buffer must be |
| at least size bytes long.</p> |
| </blockquote> |
| <p>Alas, this method does not exist on BSD operating systems (specifically Mac OS X and iOS). It is |
| possible to recreate this functionality using a BSD-specific method called <code>funopen</code>.</p> |
| <p>From the funopen man page:</p> |
| <blockquote> |
| <p>FILE * funopen(const void *cookie, int (*readfn)(void *, char *, int), |
| int (*writefn)(void *, const char *, int), fpos_t (*seekfn)(void *, fpos_t, int), |
| int (*closefn)(void *));</p> |
| <p>The funopen() function associates a stream with up to four ``I/O functions’’. Either readfn or |
| writefn must be specified; the others can be given as an appropriately-typed NULL pointer. These |
| I/O functions will be used to read, write, seek and close the new stream.</p> |
| </blockquote> |
| <p>fmemopen.c provides a simple implementation of fmemopen using funopen so that you can create FILE |
| pointers to blocks of memory.</p> |
| <h1 id="adding-it-to-your-project">Adding it to your Project</h1> |
| <p>Drag fmemopen.h and fmemopen.c to your project and add them to your target. <code>#include "fmemopen.h"</code> |
| wherever you need to use <code>fmemopen</code>.</p> |
| <h1 id="examples">Examples</h1> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-obj-c" data-lang="obj-c"><span style="display:flex;"><span><span style="color:#080">#import "fmemopen.h" |
| </span></span></span><span style="display:flex;"><span><span style="color:#080"></span> |
| </span></span><span style="display:flex;"><span>NSString<span style="color:#666">*</span> string <span style="color:#666">=</span> <span style="color:#b44">@"fmemopen in Objective-C"</span>; |
| </span></span><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">const</span> <span style="color:#0b0;font-weight:bold">char</span><span style="color:#666">*</span> cstr <span style="color:#666">=</span> [string UTF8String]; |
| </span></span><span style="display:flex;"><span>FILE<span style="color:#666">*</span> file <span style="color:#666">=</span> fmemopen((<span style="color:#0b0;font-weight:bold">void</span> <span style="color:#666">*</span>)cstr, <span style="color:#a2f;font-weight:bold">sizeof</span>(<span style="color:#0b0;font-weight:bold">char</span>) <span style="color:#666">*</span> (string.length <span style="color:#666">+</span> <span style="color:#666">1</span>), <span style="color:#b44">"r"</span>); |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic">// fread on file will now read the contents of the NSString |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"></span> |
| </span></span><span style="display:flex;"><span>fclose(file); |
| </span></span></code></pre></div> |
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