=pod
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=head1 NAME
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CMS_uncompress - uncompress a CMS CompressedData structure
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=head1 SYNOPSIS
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#include <openssl/cms.h>
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int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags);
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=head1 DESCRIPTION
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CMS_uncompress() extracts and uncompresses the content from a CMS
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CompressedData structure B<cms>. B<data> is a BIO to write the content to and
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B<flags> is an optional set of flags.
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The B<dcont> parameter is used in the rare case where the compressed content
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is detached. It will normally be set to NULL.
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=head1 NOTES
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The only currently supported compression algorithm is zlib: if the structure
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indicates the use of any other algorithm an error is returned.
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If zlib support is not compiled into OpenSSL then CMS_uncompress() will always
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return an error.
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The following flags can be passed in the B<flags> parameter.
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If the B<CMS_TEXT> flag is set MIME headers for type B<text/plain> are deleted
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from the content. If the content is not of type B<text/plain> then an error is
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returned.
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=head1 RETURN VALUES
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CMS_uncompress() returns either 1 for success or 0 for failure. The error can
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be obtained from ERR_get_error(3)
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=head1 BUGS
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The lack of single pass processing and the need to hold all data in memory as
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mentioned in CMS_verify() also applies to CMS_decompress().
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=head1 SEE ALSO
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L<ERR_get_error(3)|ERR_get_error(3)>, L<CMS_compress(3)|CMS_compress(3)>
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=head1 HISTORY
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CMS_uncompress() was added to OpenSSL 0.9.8
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=cut
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