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======================================================================== Title "CMS_compress 3" CMS_compress 3 "2018-09-23" "1.1.1i" "OpenSSL"
For nroff, turn off justification. Always turn off hyphenation; it makes way too many mistakes in technical documents..nh
"NAME"
CMS_compress - create a CMS CompressedData structure
"LIBRARY"
libcrypto, -lcrypto
"SYNOPSIS"
Header "SYNOPSIS" .Vb 1
#include <
openssl/
cms.h>
\&
CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags);
.Ve
"DESCRIPTION"
Header "DESCRIPTION" \fBCMS_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.
"NOTES"
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\s0 in.
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().
"NOTES"
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(),
\fBPEM_write_bio_CMS_stream() finalize the structure. Alternatively finalization
can be performed by obtaining the streaming \s-1ASN1\s0 \s-1BIO\s0 directly using
\fBBIO_new_CMS().
Additional compression parameters such as the zlib compression level cannot
currently be set.
"RETURN VALUES"
Header "RETURN VALUES" \fBCMS_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).
"SEE ALSO"
Header "SEE ALSO" \fBERR_get_error\|(3),
CMS_uncompress\|(3)
"HISTORY"
Header "HISTORY" The
\s-1CMS_STREAM\s0 flag was added in OpenSSL 1.0.0.
"COPYRIGHT"
Header "COPYRIGHT" Copyright 2008-2016 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.