CMS_COMPRESS - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMECMS_compress − create a CMS CompressedData structure
SYNOPSIS​ #include <openssl/cms.h> ​ ​ CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags);
DESCRIPTION​CMS_compress() creates and returns a CMS 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. ​flags is an optional set of flags.
NOTESThe only currently supported compression algorithm is zlib using the NID NID_zlib_compression. If zlib support is not compiled into OpenSSL then CMS_compress() will return an error. If the CMS_TEXT flag is set MIME headers for type text/plain are prepended to the data. Normally the supplied content is translated into MIME canonical format (as required by the S/MIME specifications) if CMS_BINARY 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 CMS_BINARY is set then ​CMS_TEXT is ignored. If the CMS_STREAM flag is set a partial CMS_ContentInfo structure is returned suitable for streaming I/O: no data is read from the BIO in. The compressed data is included in the CMS_ContentInfo structure, unless ​CMS_DETACHED is set in which case it is omitted. This is rarely used in practice and is not supported by SMIME_write_CMS().
NOTESIf the flag CMS_STREAM is set the returned CMS_ContentInfo structure is ​not 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(), ​PEM_write_bio_CMS_stream() finalize the structure. Alternatively finalization can be performed by obtaining the streaming ASN1 BIO directly using ​BIO_new_CMS(). Additional compression parameters such as the zlib compression level cannot currently be set.
RETURN VALUES​CMS_compress() returns either a CMS_ContentInfo structure or NULL if an error occurred. The error can be obtained from ERR_get_error (3).
SEE ALSO​ERR_get_error (3), CMS_uncompress (3)
HISTORYThe CMS_STREAM flag was added in OpenSSL 1.0.0.
COPYRIGHTCopyright 2008−2016 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the ‟License”). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>. 0
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