NAME¶
CMS_uncompress - uncompress a CMS CompressedData structure
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)
HISTORY¶
CMS_uncompress() was added to OpenSSL 0.9.8