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-.\" $OpenBSD: SMIME_crlf_copy.3,v 1.3 2023/05/01 07:28:11 tb Exp $
-.\"
-.\" Copyright (c) 2021 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: May 1 2023 $
-.Dt SMIME_CRLF_COPY 3
-.Os
-.Sh NAME
-.Nm SMIME_crlf_copy
-.Nd buffered copy between BIOs
-.Sh SYNOPSIS
-.Ft int
-.Fo SMIME_crlf_copy
-.Fa "BIO *in_bio"
-.Fa "BIO *out_bio"
-.Fa "int flags"
-.Fc
-.Sh DESCRIPTION
-.Fn SMIME_crlf_copy
-copies data from
-.Fa in_bio
-to
-.Fa out_bio .
-To avoid many small write operations on
-.Fa out_bio ,
-a buffering BIO created with
-.Xr BIO_f_buffer 3
-is temporarily prepended to it.
-.Pp
-If the bit
-.Dv SMIME_BINARY
-is set in the
-.Fa flags
-argument, all the data is copied verbatim using
-.Xr BIO_read 3
-and
-.Xr BIO_write 3 .
-.Pp
-Otherwise, the data is read as text.
-All trailing carriage return and newline characters are discarded
-from every input line and a single pair of carriage return and
-newline characters is appended to mark the end of every output line,
-except that the last output line will end without such a pair if
-the last input line does not have a newline character at the end.
-.Pp
-If the bit
-.Dv SMIME_TEXT
-is set in the
-.Fa flags
-argument and the bit
-.Dv SMIME_BINARY
-is not set, the line
-.Qq Content-Type: text/plain
-is prepended to the output
-with two pairs of carriage return and newline characters after it.
-.Pp
-In any case,
-.Xr BIO_flush 3
-is called on the output at the end of the function.
-.Sh RETURN VALUES
-.Fn SMIME_crlf_copy
-is intended to return 1 on success or 0 on failure.
-.Sh SEE ALSO
-.Xr BIO_f_buffer 3 ,
-.Xr BIO_flush 3 ,
-.Xr BIO_new 3 ,
-.Xr BIO_push 3 ,
-.Xr BIO_read 3 ,
-.Xr SMIME_text 3 ,
-.Xr SMIME_write_ASN1 3
-.Sh HISTORY
-.Fn SMIME_crlf_copy
-first appeared in OpenSSL 1.0.0 and has been available since
-.Ox 4.9 .
-.Sh BUGS
-.Fn SMIME_crlf_copy
-silently ignores most errors and may return 1
-even if it lost part or all of the data in transit.
-.Pp
-Only blocking BIOs are supported.
-If any of the
-.Vt BIO
-arguments is non-blocking, part or all of the data is likely
-to be silently lost in transit.