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+.\" $OpenBSD: i2d_ASN1_bio_stream.3,v 1.1 2021/12/13 13:46:09 schwarze 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: December 13 2021 $
+.Dt I2D_ASN1_BIO_STREAM 3
+.Os
+.Sh NAME
+.Nm i2d_ASN1_bio_stream
+.Nd generic BER streamer
+.Sh SYNOPSIS
+.In openssl/asn1.h
+.Ft int
+.Fo i2d_ASN1_bio_stream
+.Fa "BIO *out_bio"
+.Fa "ASN1_VALUE *val_in"
+.Fa "BIO *in_bio"
+.Fa "int flags"
+.Fa "const ASN1_ITEM *it"
+.Fc
+.Sh DESCRIPTION
+If the bit
+.Dv SMIME_STREAM
+is not set in the
+.Fa flags
+argument,
+.Fn i2d_ASN1_bio_stream
+does the same as
+.Xr ASN1_item_i2d_bio 3 ,
+ignoring the
+.Fa in_bio
+and
+.Fa flags
+arguments.
+.Pp
+If the bit
+.Dv SMIME_STREAM
+is set, it creates a streaming BIO with
+.Xr BIO_new_NDEF 3 ,
+copies the data from
+.Fa in_bio
+to it using
+.Xr SMIME_crlf_copy 3 ,
+finalizes the output with
+.Xr BIO_flush 3 ,
+and frees the newly created BIOs up to but not including
+.Fa out_bio .
+.Pp
+If
+.Fa it
+is
+.Va PKCS7_it ,
+this function behaves exactly as
+.Xr i2d_PKCS7_bio_stream 3 ;
+for
+.Va CMS_ContentInfo_it ,
+it behaves exactly as
+.Xr i2d_CMS_bio_stream 3 .
+For other values of
+.Fa it ,
+the function fails.
+.Sh RETURN VALUES
+.Fn i2d_ASN1_bio_stream
+is intended to return 1 on success or 0 on failure.
+.Sh SEE ALSO
+.Xr ASN1_item_i2d_bio 3 ,
+.Xr ASN1_item_ndef_i2d 3 ,
+.Xr BIO_flush 3 ,
+.Xr BIO_new 3 ,
+.Xr BIO_new_NDEF 3 ,
+.Xr BIO_push 3 ,
+.Xr i2d_CMS_bio_stream 3 ,
+.Xr i2d_PKCS7_bio_stream 3 ,
+.Xr SMIME_crlf_copy 3
+.Sh HISTORY
+.Fn i2d_ASN1_bio_stream
+first appeared in OpenSSL 1.0.0 and has been available since
+.Ox 4.9 .
+.Sh BUGS
+Many kinds of errors are silently ignored.
+This function may return 1 even if it only produced partial output
+or no output at all.