1=pod
2
3=head1 NAME
4
5 CMS_uncompress - uncompress a CMS CompressedData structure
6
7=head1 SYNOPSIS
8
9 #include <openssl/cms.h>
10
11 int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags);
12
13=head1 DESCRIPTION
14
15CMS_uncompress() extracts and uncompresses the content from a CMS
16CompressedData structure B<cms>. B<data> is a BIO to write the content to and
17B<flags> is an optional set of flags.
18
19The B<dcont> parameter is used in the rare case where the compressed content
20is detached. It will normally be set to NULL.
21
22=head1 NOTES
23
24The only currently supported compression algorithm is zlib: if the structure
25indicates the use of any other algorithm an error is returned.
26
27If zlib support is not compiled into OpenSSL then CMS_uncompress() will always
28return an error.
29
30The following flags can be passed in the B<flags> parameter.
31
32If the B<CMS_TEXT> flag is set MIME headers for type B<text/plain> are deleted
33from the content. If the content is not of type B<text/plain> then an error is
34returned.
35
36=head1 RETURN VALUES
37
38CMS_uncompress() returns either 1 for success or 0 for failure. The error can
39be obtained from ERR_get_error(3)
40
41=head1 BUGS
42
43The lack of single pass processing and the need to hold all data in memory as
44mentioned in CMS_verify() also applies to CMS_decompress().
45
46=head1 SEE ALSO
47
48L<ERR_get_error(3)|ERR_get_error(3)>, L<CMS_compress(3)|CMS_compress(3)>
49
50=head1 HISTORY
51
52CMS_uncompress() was added to OpenSSL 0.9.8
53
54=cut
55