CMS_UNCOMPRESS
Section: OpenSSL (3)
Updated: 2021-03-26
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NAME
CMS_uncompress - uncompress a CMS CompressedData structure
SYNOPSIS
#include <openssl/cms.h>
int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags);
DESCRIPTION
CMS_uncompress() extracts and uncompresses the content from a
CMS
CompressedData structure
cms.
data is a
BIO to write the content to and
flags is an optional set of flags.
The dcont parameter is used in the rare case where the compressed content
is detached. It will normally be set to NULL.
NOTES
The only currently supported compression algorithm is zlib: if the structure
indicates the use of any other algorithm an error is returned.
If zlib support is not compiled into OpenSSL then CMS_uncompress() will always
return an error.
The following flags can be passed in the flags parameter.
If the CMS_TEXT flag is set MIME headers for type text/plain are deleted
from the content. If the content is not of type text/plain then an error is
returned.
RETURN VALUES
CMS_uncompress() returns either 1 for success or 0 for failure. The error can
be obtained from
ERR_get_error(3)
BUGS
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().
SEE ALSO
ERR_get_error(3),
CMS_compress(3)
COPYRIGHT
Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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
<https://www.openssl.org/source/license.html>.