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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#NOTES">NOTES</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#BUGS">BUGS</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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<p>CMS_uncompress - uncompress a CMS CompressedData structure</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code> #include &lt;openssl/cms.h&gt;

int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>CMS_uncompress() extracts and uncompresses the content from a CMS CompressedData structure <b>cms</b>. <b>data</b> is a BIO to write the content to and <b>flags</b> is an optional set of flags.</p>

<p>The <b>dcont</b> parameter is used in the rare case where the compressed content is detached. It will normally be set to NULL.</p>

<h1 id="NOTES">NOTES</h1>

<p>The only currently supported compression algorithm is zlib: if the structure indicates the use of any other algorithm an error is returned.</p>

<p>If zlib support is not compiled into OpenSSL then CMS_uncompress() will always return an error.</p>

<p>The following flags can be passed in the <b>flags</b> parameter.</p>

<p>If the <b>CMS_TEXT</b> flag is set MIME headers for type <b>text/plain</b> are deleted from the content. If the content is not of type <b>text/plain</b> then an error is returned.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>CMS_uncompress() returns either 1 for success or 0 for failure. The error can be obtained from ERR_get_error(3)</p>

<p>The lack of single pass processing and the need to hold all data in memory as mentioned in CMS_verify() also applies to CMS_decompress().</p>

<p><a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>, <a href="../man3/CMS_compress.html">CMS_compress(3)</a></p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>

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