1CMS_UNCOMPRESS(3)                   OpenSSL                  CMS_UNCOMPRESS(3)
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NAME

6       CMS_uncompress - uncompress a CMS CompressedData structure
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SYNOPSIS

9        #include <openssl/cms.h>
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11        int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags);
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DESCRIPTION

14       CMS_uncompress() extracts and uncompresses the content from a CMS
15       CompressedData structure cms. data is a BIO to write the content to and
16       flags is an optional set of flags.
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18       The dcont parameter is used in the rare case where the compressed
19       content is detached. It will normally be set to NULL.
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NOTES

22       The only currently supported compression algorithm is zlib: if the
23       structure indicates the use of any other algorithm an error is
24       returned.
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26       If zlib support is not compiled into OpenSSL then CMS_uncompress() will
27       always return an error.
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29       The following flags can be passed in the flags parameter.
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31       If the CMS_TEXT flag is set MIME headers for type text/plain are
32       deleted from the content. If the content is not of type text/plain then
33       an error is returned.
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RETURN VALUES

36       CMS_uncompress() returns either 1 for success or 0 for failure. The
37       error can be obtained from ERR_get_error(3)
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BUGS

40       The lack of single pass processing and the need to hold all data in
41       memory as mentioned in CMS_verify() also applies to CMS_decompress().
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SEE ALSO

44       ERR_get_error(3), CMS_compress(3)
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47       Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
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49       Licensed under the OpenSSL license (the "License").  You may not use
50       this file except in compliance with the License.  You can obtain a copy
51       in the file LICENSE in the source distribution or at
52       <https://www.openssl.org/source/license.html>.
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561.1.1q                            2023-02-06                 CMS_UNCOMPRESS(3)
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