Updated: 2022/Sep/29

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CMS_uncompress(3)                   OpenSSL                  CMS_uncompress(3)



NAME
       CMS_uncompress - uncompress a CMS CompressedData structure

LIBRARY
       libcrypto, -lcrypto

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 Apache License 2.0 (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>.



3.0.12                            2023-05-07                 CMS_uncompress(3)