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Title "CMS_compress 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
CMS_compress - create a CMS CompressedData structure Header "SYNOPSIS" .Vb 1 #include <openssl/cms.h> \& CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags); .Ve Header "DESCRIPTION" \fICMS_compress() creates and returns a \s-1CMS\s0 CompressedData structure. comp_nid is the compression algorithm to use or NID_undef to use the default algorithm (zlib compression). in is the content to be compressed. \fBflags is an optional set of flags. Header "NOTES" The only currently supported compression algorithm is zlib using the \s-1NID\s0 NID_zlib_compression.

If zlib support is not compiled into OpenSSL then CMS_compress() will return an error.

If the \s-1CMS_TEXT\s0 flag is set \s-1MIME\s0 headers for type text/plain are prepended to the data.

Normally the supplied content is translated into \s-1MIME\s0 canonical format (as required by the S/MIME specifications) if \s-1CMS_BINARY\s0 is set no translation occurs. This option should be used if the supplied data is in binary format otherwise the translation will corrupt it. If \s-1CMS_BINARY\s0 is set then \fB\s-1CMS_TEXT\s0 is ignored.

If the \s-1CMS_STREAM\s0 flag is set a partial CMS_ContentInfo structure is returned suitable for streaming I/O: no data is read from the \s-1BIO \s0in.

The compressed data is included in the CMS_ContentInfo structure, unless \fB\s-1CMS_DETACHED\s0 is set in which case it is omitted. This is rarely used in practice and is not supported by SMIME_write_CMS().

Header "NOTES" If the flag \s-1CMS_STREAM\s0 is set the returned CMS_ContentInfo structure is \fBnot complete and outputting its contents via a function that does not properly finalize the CMS_ContentInfo structure will give unpredictable results.

Several functions including SMIME_write_CMS(), i2d_CMS_bio_stream(), \fIPEM_write_bio_CMS_stream() finalize the structure. Alternatively finalization can be performed by obtaining the streaming \s-1ASN1 \s0\s-1BIO\s0 directly using \fIBIO_new_CMS().

Additional compression parameters such as the zlib compression level cannot currently be set.

Header "RETURN VALUES" \fICMS_compress() returns either a CMS_ContentInfo structure or \s-1NULL\s0 if an error occurred. The error can be obtained from ERR_get_error\|(3). Header "SEE ALSO" \fIERR_get_error\|(3), CMS_uncompress\|(3) Header "HISTORY" \fICMS_compress() was added to OpenSSL 0.9.8 The \s-1CMS_STREAM\s0 flag was first supported in OpenSSL 1.0.0.