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.\" $OpenBSD: ober_set_header.3,v 1.2 2021/03/12 05:18:01 jsg Exp $
.\"
.\" Copyright (c) 2007, 2012 Reyk Floeter <reyk@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: March 12 2021 $
.Dt OBER_SET_HEADER 3
.Os
.Sh NAME
.Nm ober_set_header ,
.Nm ober_calc_len ,
.Nm ober_set_writecallback ,
.Nm ober_link_elements ,
.Nm ober_replace_elements ,
.Nm ober_unlink_elements ,
.Nm ober_free_element ,
.Nm ober_free_elements
.Nd change and destroy ASN.1 objects for BER encoding
.Sh SYNOPSIS
.In sys/types.h
.In ber.h
.Ft "void"
.Fn "ober_set_header" "struct ber_element *elm" "int class" "unsigned int type"
.Ft "size_t"
.Fn "ober_calc_len" "struct ber_element *root"
.Ft "void"
.Fo "ober_set_writecallback"
.Fa "struct ber_element *elm"
.Fa "void (*cb)(void *arg, size_t offs)"
.Fa "void *arg"
.Fc
.Ft "void"
.Fn "ober_link_elements" "struct ber_element *prev" "struct ber_element *elm"
.Ft "void"
.Fn "ober_replace_elements" "struct ber_element *prev" "struct ber_element *elm"
.Ft "struct ber_element *"
.Fn "ober_unlink_elements" "struct ber_element *prev"
.Ft "void"
.Fn "ober_free_element" "struct ber_element *root"
.Ft "void"
.Fn "ober_free_elements" "struct ber_element *root"
.Pp
.Fd #define BER_TYPE_BOOLEAN 1
.Fd #define BER_TYPE_INTEGER 2
.Fd #define BER_TYPE_BITSTRING 3
.Fd #define BER_TYPE_OCTETSTRING 4
.Fd #define BER_TYPE_NULL 5
.Fd #define BER_TYPE_OBJECT 6
.Fd #define BER_TYPE_ENUMERATED 10
.Fd #define BER_TYPE_SEQUENCE 16
.Fd #define BER_TYPE_SET 17
.Pp
.Fd #define BER_TYPE_CONSTRUCTED 0x20
.Pp
.Fd #define BER_CLASS_UNIVERSAL 0x0
.Fd #define BER_CLASS_UNIV BER_CLASS_UNIVERSAL
.Fd #define BER_CLASS_APPLICATION 0x1
.Fd #define BER_CLASS_APP BER_CLASS_APPLICATION
.Fd #define BER_CLASS_CONTEXT 0x2
.Fd #define BER_CLASS_PRIVATE 0x3
.Sh DESCRIPTION
.Fn ober_set_header
sets the
.Fa class
and
.Fa type
of
.Fa elm .
.Pp
.Fn ober_calc_len
determines the total length of
.Fa root .
.Pp
.Fn ober_set_writecallback
registers the
.Vt br_cb
callback function.
.Pp
.Fn ober_link_elements
links
.Fa prev
and
.Fa elm .
.Pp
.Fn ober_replace_elements
replaces
.Fa prev
with
.Fa new
and frees any dynamically allocated storage associated with
.Fa prev .
.Pp
.Fn ober_unlink_elements
unlinks
.Fa prev .
.Pp
.Fn ober_free_element
and
.Fn ober_free_elements
free any dynamically allocated storage associated with
.Fa root .
.Sh RETURN VALUES
.Fn ober_calc_len
returns the total length of a fully populated
.Fa root
containing one or more
.Vt ber_element .
.Pp
.Fn ober_unlink_elements
returns a pointer to
.Vt ber_element .
.Sh SEE ALSO
.Xr ober_add_string 3 ,
.Xr ober_get_string 3 ,
.Xr ober_oid_cmp 3 ,
.Xr ober_read_elements 3
.Sh STANDARDS
ITU-T Recommendation X.690, also known as ISO/IEC 8825-1:
Information technology - ASN.1 encoding rules.
.Sh HISTORY
These functions first appeared as internal functions in
.Xr snmpd 8
in
.Ox 4.2
and were moved to libutil in
.Ox 6.6 .
.Sh AUTHORS
.An -nosplit
The BER library was written by
.An Claudio Jeker Aq Mt claudio@openbsd.org ,
.An Marc Balmer Aq Mt marc@openbsd.org
and
.An Reyk Floeter Aq Mt reyk@openbsd.org .
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