CMS_uncompress - uncompress a CMS CompressedData structure
int CMS_uncompress(CMS_ContentInfo *cms, BIO *dcont, BIO *out, unsigned int flags);
extracts and uncompresses the content from a CMS
CompressedData structure cms
is a BIO to write the content
to and flags
is an optional set of flags.
parameter is used in the rare case where the compressed content
is detached. It will normally be set to NULL.
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()
always return an error.
The following flags can be passed in the flags
If the CMS_TEXT
flag is set MIME headers for type text/plain
deleted from the content. If the content is not of type text/plain
an error is returned.
returns either 1 for success or 0 for failure. The error
can be obtained from ERR_get_error(3)
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()
was added to OpenSSL 0.9.8