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This option should be used if the supplied data is in binary format otherwise the translation will corrupt it. If \fB\s-1CMS_BINARY\s0\fR is set then \&\fB\s-1CMS_TEXT\s0\fR is ignored. .PP If the \fB\s-1CMS_STREAM\s0\fR flag is set a partial \fBCMS_ContentInfo\fR structure is returned suitable for streaming I/O: no data is read from the \s-1BIO\s0 \fBin\fR. .PP The compressed data is included in the CMS_ContentInfo structure, unless \&\fB\s-1CMS_DETACHED\s0\fR is set in which case it is omitted. This is rarely used in practice and is not supported by \fISMIME_write_CMS()\fR. .SH "NOTES" .IX Header "NOTES" If the flag \fB\s-1CMS_STREAM\s0\fR is set the returned \fBCMS_ContentInfo\fR structure is \&\fBnot\fR complete and outputting its contents via a function that does not properly finalize the \fBCMS_ContentInfo\fR structure will give unpredictable results. .PP Several functions including \fISMIME_write_CMS()\fR, \fIi2d_CMS_bio_stream()\fR, \&\fIPEM_write_bio_CMS_stream()\fR finalize the structure. Alternatively finalization can be performed by obtaining the streaming \s-1ASN1\s0 \fB\s-1BIO\s0\fR directly using \&\fIBIO_new_CMS()\fR. .PP Additional compression parameters such as the zlib compression level cannot currently be set. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fICMS_compress()\fR returns either a CMS_ContentInfo structure or \s-1NULL\s0 if an error occurred. The error can be obtained from \fIERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIERR_get_error\fR\|(3), \fICMS_uncompress\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fICMS_compress()\fR was added to OpenSSL 0.9.8 The \fB\s-1CMS_STREAM\s0\fR flag was first supported in OpenSSL 1.0.0.