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.\" ========================================================================
.\"
.IX Title "CMS_UNCOMPRESS 3"
.TH CMS_UNCOMPRESS 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
CMS_uncompress \- uncompress a CMS CompressedData structure
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/cms.h>
\&
\& int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBCMS_uncompress()\fR extracts and uncompresses the content from a \s-1CMS\s0
CompressedData structure \fBcms\fR. \fBdata\fR is a \s-1BIO\s0 to write the content to and
\&\fBflags\fR is an optional set of flags.
.PP
The \fBdcont\fR parameter is used in the rare case where the compressed content
is detached. It will normally be set to \s-1NULL.\s0
.SH "NOTES"
.IX Header "NOTES"
The only currently supported compression algorithm is zlib: if the structure
indicates the use of any other algorithm an error is returned.
.PP
If zlib support is not compiled into OpenSSL then \fBCMS_uncompress()\fR will always
return an error.
.PP
The following flags can be passed in the \fBflags\fR parameter.
.PP
If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are deleted
from the content. If the content is not of type \fBtext/plain\fR then an error is
returned.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBCMS_uncompress()\fR returns either 1 for success or 0 for failure. The error can
be obtained from \fBERR_get_error\fR\|(3)
.SH "BUGS"
.IX Header "BUGS"
The lack of single pass processing and the need to hold all data in memory as
mentioned in \fBCMS_verify()\fR also applies to \fBCMS_decompress()\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3), \fBCMS_compress\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2008\-2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.