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CMS_compress.html
<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>CMS_compress</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <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="#NOTES1">NOTES</a></li> <li><a href="#RETURN-VALUES">RETURN VALUES</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#HISTORY">HISTORY</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>CMS_compress - create a CMS CompressedData structure</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/cms.h> CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>CMS_compress() creates and returns a CMS CompressedData structure. <b>comp_nid</b> is the compression algorithm to use or <b>NID_undef</b> to use the default algorithm (zlib compression). <b>in</b> is the content to be compressed. <b>flags</b> is an optional set of flags.</p> <h1 id="NOTES">NOTES</h1> <p>The only currently supported compression algorithm is zlib using the NID NID_zlib_compression.</p> <p>If zlib support is not compiled into OpenSSL then CMS_compress() will return an error.</p> <p>If the <b>CMS_TEXT</b> flag is set MIME headers for type <b>text/plain</b> are prepended to the data.</p> <p>Normally the supplied content is translated into MIME canonical format (as required by the S/MIME specifications) if <b>CMS_BINARY</b> is set no translation occurs. This option should be used if the supplied data is in binary format otherwise the translation will corrupt it. If <b>CMS_BINARY</b> is set then <b>CMS_TEXT</b> is ignored.</p> <p>If the <b>CMS_STREAM</b> flag is set a partial <b>CMS_ContentInfo</b> structure is returned suitable for streaming I/O: no data is read from the BIO <b>in</b>.</p> <p>The compressed data is included in the CMS_ContentInfo structure, unless <b>CMS_DETACHED</b> is set in which case it is omitted. This is rarely used in practice and is not supported by SMIME_write_CMS().</p> <h1 id="NOTES1">NOTES</h1> <p>If the flag <b>CMS_STREAM</b> is set the returned <b>CMS_ContentInfo</b> structure is <b>not</b> complete and outputting its contents via a function that does not properly finalize the <b>CMS_ContentInfo</b> structure will give unpredictable results.</p> <p>Several functions including SMIME_write_CMS(), i2d_CMS_bio_stream(), PEM_write_bio_CMS_stream() finalize the structure. Alternatively finalization can be performed by obtaining the streaming ASN1 <b>BIO</b> directly using BIO_new_CMS().</p> <p>Additional compression parameters such as the zlib compression level cannot currently be set.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>CMS_compress() returns either a CMS_ContentInfo structure or NULL if an error occurred. The error can be obtained from ERR_get_error(3).</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>, <a href="../man3/CMS_uncompress.html">CMS_uncompress(3)</a></p> <h1 id="HISTORY">HISTORY</h1> <p>The <b>CMS_STREAM</b> flag was added in OpenSSL 1.0.0.</p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). 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> </body> </html>
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