195 lines
6.4 KiB
Groff
195 lines
6.4 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "CMS_compress 3"
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.TH CMS_compress 3 "2014-10-15" "1.0.1j" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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CMS_compress \- create a CMS CompressedData structure
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/cms.h>
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\&
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\& CMS_ContentInfo *CMS_compress(BIO *in, int comp_nid, unsigned int flags);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fICMS_compress()\fR creates and returns a \s-1CMS\s0 CompressedData structure. \fBcomp_nid\fR
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is the compression algorithm to use or \fBNID_undef\fR to use the default
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algorithm (zlib compression). \fBin\fR is the content to be compressed.
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\&\fBflags\fR is an optional set of flags.
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.SH "NOTES"
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.IX Header "NOTES"
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The only currently supported compression algorithm is zlib using the \s-1NID\s0
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NID_zlib_compression.
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.PP
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If zlib support is not compiled into OpenSSL then \fICMS_compress()\fR will return
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an error.
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.PP
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If the \fB\s-1CMS_TEXT\s0\fR flag is set \s-1MIME\s0 headers for type \fBtext/plain\fR are
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prepended to the data.
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.PP
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Normally the supplied content is translated into \s-1MIME\s0 canonical format (as
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required by the S/MIME specifications) if \fB\s-1CMS_BINARY\s0\fR is set no translation
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occurs. This option should be used if the supplied data is in binary format
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otherwise the translation will corrupt it. If \fB\s-1CMS_BINARY\s0\fR is set then
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\&\fB\s-1CMS_TEXT\s0\fR is ignored.
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.PP
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If the \fB\s-1CMS_STREAM\s0\fR flag is set a partial \fBCMS_ContentInfo\fR structure is
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returned suitable for streaming I/O: no data is read from the \s-1BIO\s0 \fBin\fR.
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.PP
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The compressed data is included in the CMS_ContentInfo structure, unless
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\&\fB\s-1CMS_DETACHED\s0\fR is set in which case it is omitted. This is rarely used in
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practice and is not supported by \fISMIME_write_CMS()\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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If the flag \fB\s-1CMS_STREAM\s0\fR is set the returned \fBCMS_ContentInfo\fR structure is
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\&\fBnot\fR complete and outputting its contents via a function that does not
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properly finalize the \fBCMS_ContentInfo\fR structure will give unpredictable
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results.
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.PP
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Several functions including \fISMIME_write_CMS()\fR, \fIi2d_CMS_bio_stream()\fR,
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\&\fIPEM_write_bio_CMS_stream()\fR finalize the structure. Alternatively finalization
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can be performed by obtaining the streaming \s-1ASN1\s0 \fB\s-1BIO\s0\fR directly using
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\&\fIBIO_new_CMS()\fR.
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.PP
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Additional compression parameters such as the zlib compression level cannot
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currently be set.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fICMS_compress()\fR returns either a CMS_ContentInfo structure or \s-1NULL\s0 if an error
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occurred. The error can be obtained from \fIERR_get_error\fR\|(3).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIERR_get_error\fR\|(3), \fICMS_uncompress\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fICMS_compress()\fR was added to OpenSSL 0.9.8
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The \fB\s-1CMS_STREAM\s0\fR flag was first supported in OpenSSL 1.0.0.
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