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-.\"
-.\" Copyright (c) 2001-2003
-.\"	Fraunhofer Institute for Open Communication Systems (FhG Fokus).
-.\" 	All rights reserved.
-.\"
-.\" Author: Hartmut Brandt <harti@freebsd.org>
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\" $Begemot: libunimsg/man/unifunc.3,v 1.3 2004/07/08 08:21:43 brandt Exp $
-.\"
-.Dd October 30, 2003
-.Dt unifunc 3
-.Os
-.Sh NAME
-.Nm libngatm
-.Nm uni_decode
-.Nm uni_decode_head
-.Nm uni_decode_body
-.Nm uni_decode_ie_hdr
-.Nm uni_decode_ie_body
-.Nm uni_encode
-.Nm uni_encode_msg_hdr
-.Nm uni_encode_ie
-.Nm uni_encode_ie_hdr
-.Nm uni_check_ie
-.Nm uni_print_cref
-.Nm uni_print_msghdr
-.Nm uni_print
-.Nm uni_print_ie
-.Nm uni_initcx
-.Nm uni_print_cx
-.Nd "ATM signalling library - message handling functions"
-.Sh LIBRARY
-Begemot ATM signalling library
-.Pq libngatm, -lngatm
-.Sh SYNOPSIS
-.In netnatm/msg/unistruct.h
-.In netnatm/msg/unimsglib.h
-.Ft int
-.Fn uni_decode "struct uni_msg *buf" "struct uni_all *msg" "struct unicx *cx"
-.Ft int
-.Fn uni_decode_head "struct uni_msg *buf" "struct uni_all *msg" "struct unicx *cx"
-.Ft int
-.Fn uni_decode_body "struct uni_msg *buf" "struct uni_all *msg" "struct unicx *cx"
-.Ft int
-.Fn uni_decode_ie_hdr "enum uni_ietype *type" "struct uni_iehdr *hdr" "struct uni_msg *buf" "struct unicx *cx" "u_int *ielen"
-.Ft int
-.Fn uni_decode_ie_body "enum uni_ietype type" "union uni_ieall *ie" "struct uni_msg *buf" "u_int ielen" "struct unicx *cx"
-.Ft int
-.Fn uni_encode "struct uni_msg *buf" "struct uni_all *msg" "struct unicx *cx"
-.Ft int
-.Fn uni_encode_msg_hdr "struct uni_msg *buf" "struct uni_msghdr *hdr" "enum uni_msgtype type" "struct unicx *cx" "int *mlen"
-.Ft int
-.Fn uni_encode_ie "enum uni_ietype type" "struct uni_msg *buf" "union uni_ieall *ie" "struct unicx *cx"
-.Ft int
-.Fn uni_encode_ie_hdr "struct uni_msg *buf" "enum uni_ietype type" "struct uni_iehdr *hdr" "u_int len" "struct unicx *cx"
-.Ft int
-.Fn uni_check_ie "enum uni_ietype type" "union uni_ieall *ie" "struct unicx *cx"
-.Ft void
-.Fn uni_print_cref "char *buf" "size_t buflen" "struct uni_cref *cref" "struct unicx *cx"
-.Ft void
-.Fn uni_print_msghdr "char *buf" "size_t buflen" "struct uni_msghdr *hdr" "struct unicx *cx"
-.Ft void
-.Fn uni_print "char *buf" "size_t buflen" "struct uni_all *msg" "struct unicx *cx"
-.Ft void
-.Fn uni_print_ie "char *buf" "size_t buflen" "enum uni_ietype type" "union uni_ieall *ie" "struct unicx *cx"
-.Ft void
-.Fn uni_initcx "struct unicx *cx"
-.Ft void
-.Fn uni_print_cx "char *buf" "size_t buflen" "struct unicx *cx"
-.Sh DESCRIPTION
-The
-.Nm
-library handles UNI 4.0 messages.
-For each information element and message
-type the header files contain a structure definition.
-Additionally there 
-are a number of help structures and a global context structure for some
-of the library functions.
-This document describes the functions that are
-used to handle messages.
-.Ss DECODING
-Decoding is the process of taking an octet stream containing a UNI message
-or IE, parsing it and filling in a message or IE structure.
-.Pp
-The function
-.Fn uni_decode
-takes a message buffer, interprets it as a UNI message and fills in the
-structure pointed to by
-.Fa msg .
-It also takes a context argument and may fill the error array in the context.
-It returns -1 if there is an error decoding the message header and
--2 if there is an error decoding the message body.
-The function returns 0 on success.
-.Pp
-The process of decoding a message can be split up by calling
-.Fn uni_decode_head
-and
-.Fn uni_decode_body .
-The first of these functions decodes only the message header and the second
-one decodes only the information elements.
-.Fn uni_decode_head
-returns 0 if it could decode the message header
-and -1 if the message could not be decoded (bad protocol
-identifier, bad length or broken call reference).
-.Fn uni_decode_body
-return 0 on success and -1 for unknown message types or if any
-IE had an error.
-.Pp
-The function
-.Fn uni_decode_ie_hdr
-decodes the next information element header.
-It returns the IE type and its length
-in the variables pointed to by
-.Va type
-and
-.Va ielen
-and stores the decoded header in the structure pointed to by
-.Va hdr .
-The function returns 0 on success and -1 if there were not enough bytes
-in the buffer left for a complete IE header.
-.Pp
-The function
-.Fn uni_decode_ie_body
-decodes the body of an information element. It is passed the buffer with the
-message
-.Fa buf ,
-the information element type
-.Fa type
-and length
-.Fa ielen .
-The IE is stored in the union pointed to by
-.Fa ie .
-The function returns -1 on errors and 0 on success.
-In any case the most correct
-number of bytes is consumed from the input buffer.
-.Ss ENCODING
-Encoding is the process of taking a message or IE structure and producing
-an octet stream from it.
-.Pp
-The function
-.Fn uni_encode
-encodes a UNI message.
-It returns -1 if the message type is out of bounds, -3
-if the message type is unknown.
-The encoding functions for the message types
-can return their own error codes.
-The function returns 0 on success.
-.Pp
-The function
-.Fn uni_encode_msg_hdr
-encodes a message header.
-The variable pointed to by
-.Fa mlen
-is set to the offset of the message length field from the begin of the
-byte stream.
-This is needed because the length of the message body will
-be known only after all the IEs have been encoded.
-Then the length
-has to be inserted into this place.
-The function returns -1 if the call reference
-was bad and 0 on success.
-.Pp
-The function
-.Fn uni_encode_ie
-encodes one information element.
-The function returns 0 on success or -1
-on errors.
-The function
-.Fn uni_encode_ie_hdr
-encodes the four byte IE header.
-The argument
-.Fa len
-is the maximum expected length of the information element, not the real length.
-The function inserts a 0 in the real length field.
-This must be
-fixed up by the caller after encoding the IE contents.
-The function
-return -1 if an empty IE is to be encoded (in this case the length field will
-have been set to 4) or 0 otherwise.
-.Ss CHECKING
-There exists a number of function that do consistency checks on information
-elements.
-Note, that these functions do not check inter-IE consistency, but
-each IE by itself.
-.Pp
-The function
-.Fn uni_check_ie
-check an information element for consistency.
-It returns 0 if the IE seems
-ok, -1 otherwise.
-.Ss PRINTING
-A number of functions can be used to print decoded messages and IEs in
-a human readable form.
-This is intended mainly for debugging.
-Some fields of the library context are used to control how the printing is done
-(see
-.Xr unistruct 3 ).
-Each of the function takes a
-.Fa buf
-and a
-.Fa buflen
-argument.
-The string that is generated in the buffer pointed to by
-.Fa buf
-is guaranteed to be NUL terminated.
-.Pp
-The function
-.Fn uni_print_cref
-formats a call reference taking into account special call references.
-The function
-.Fn uni_print_msg_hdr
-formats a message header.
-The functions
-.Fn uni_print
-and
-.Fn uni_print_ie
-print messages and information elements.
-.Ss CONTEXTS
-There are two functions for context handling.
-.Fn uni_initcx
-initializes a context with default values and
-.Fn uni_print_cx
-prints a context to the given buffer.
-.Sh SEE ALSO
-.Xr libngatm 3
-.Sh STANDARDS
-This implementation conforms to the applicable ITU-T
-recommendations and ATM Forum standards with the exception of some limitations
-(see the Configuration section).
-.Sh AUTHORS
-.An Hartmut Brandt Aq harti@freebsd.org