You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
3.2 KiB
101 lines
3.2 KiB
16 years ago
|
/*
|
||
|
|
* libpri: An implementation of Primary Rate ISDN
|
||
|
|
*
|
||
|
|
* Copyright (C) 2009 Digium, Inc.
|
||
|
|
*
|
||
|
|
* Richard Mudgett <rmudgett@digium.com>
|
||
|
|
*
|
||
|
|
* See http://www.asterisk.org for more information about
|
||
|
|
* the Asterisk project. Please do not directly contact
|
||
|
|
* any of the maintainers of this project for assistance;
|
||
|
|
* the project provides a web site, mailing lists and IRC
|
||
|
|
* channels for your use.
|
||
|
|
*
|
||
|
|
* This program is free software, distributed under the terms of
|
||
|
|
* the GNU General Public License Version 2 as published by the
|
||
|
|
* Free Software Foundation. See the LICENSE file included with
|
||
|
|
* this program for more details.
|
||
|
|
*
|
||
|
|
* In addition, when this program is distributed with Asterisk in
|
||
|
|
* any form that would qualify as a 'combined work' or as a
|
||
|
|
* 'derivative work' (but not mere aggregation), you can redistribute
|
||
|
|
* and/or modify the combination under the terms of the license
|
||
|
|
* provided with that copy of Asterisk, instead of the license
|
||
|
|
* terms granted here.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*!
|
||
|
|
* \file
|
||
|
|
* \brief ROSE Q.931 ie encode/decode functions
|
||
|
|
*
|
||
|
|
* \author Richard Mudgett <rmudgett@digium.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#include "compat.h"
|
||
|
|
#include "libpri.h"
|
||
|
|
#include "pri_internal.h"
|
||
|
|
#include "rose.h"
|
||
|
|
#include "rose_internal.h"
|
||
|
|
#include "asn1.h"
|
||
|
|
|
||
|
|
|
||
|
|
/* ------------------------------------------------------------------- */
|
||
|
|
|
||
|
|
/*!
|
||
|
|
* \brief Encode the Q.931 ie value.
|
||
|
|
*
|
||
|
|
* \param ctrl D channel controller for diagnostic messages or global options.
|
||
|
|
* \param pos Starting position to encode ASN.1 component.
|
||
|
|
* \param end End of ASN.1 encoding data buffer.
|
||
|
|
* \param tag Component tag to identify the encoded component.
|
||
|
|
* The tag should be ASN1_CLASS_APPLICATION | 0 unless the caller
|
||
|
|
* implicitly tags it otherwise.
|
||
|
|
* \param q931ie Q931 ie information to encode.
|
||
|
|
*
|
||
|
|
* \retval Start of the next ASN.1 component to encode on success.
|
||
|
|
* \retval NULL on error.
|
||
|
|
*/
|
||
|
|
unsigned char *rose_enc_Q931ie(struct pri *ctrl, unsigned char *pos, unsigned char *end,
|
||
|
|
unsigned tag, const struct roseQ931ie *q931ie)
|
||
|
|
{
|
||
|
|
return asn1_enc_string_bin(pos, end, tag, q931ie->contents, q931ie->length);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
* \brief Decode the Q.931 ie value.
|
||
|
|
*
|
||
|
|
* \param ctrl D channel controller for diagnostic messages or global options.
|
||
|
|
* \param name Field name
|
||
|
|
* \param tag Component tag that identified this production.
|
||
|
|
* \param pos Starting position of the ASN.1 component length.
|
||
|
|
* \param end End of ASN.1 decoding data buffer.
|
||
|
|
* \param q931ie Parameter storage to fill.
|
||
|
|
* \param contents_size Amount of space "allocated" for the q931ie->contents
|
||
|
|
* element. Must have enough room for a null terminator.
|
||
|
|
*
|
||
|
|
* \retval Start of the next ASN.1 component on success.
|
||
|
|
* \retval NULL on error.
|
||
|
|
*/
|
||
|
|
const unsigned char *rose_dec_Q931ie(struct pri *ctrl, const char *name, unsigned tag,
|
||
|
|
const unsigned char *pos, const unsigned char *end, struct roseQ931ie *q931ie,
|
||
|
|
size_t contents_size)
|
||
|
|
{
|
||
|
|
size_t str_len;
|
||
|
|
|
||
|
|
/* NOTE: The q931ie->contents memory is "allocated" after the struct. */
|
||
|
|
ASN1_CALL(pos, asn1_dec_string_bin(ctrl, name, tag, pos, end, contents_size,
|
||
|
|
q931ie->contents, &str_len));
|
||
|
|
q931ie->length = str_len;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* NOTE: We may want to do some basic decoding of the Q.931 ie list
|
||
|
|
* for debug purposes.
|
||
|
|
*/
|
||
|
|
|
||
|
|
return pos;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* ------------------------------------------------------------------- */
|
||
|
|
/* end rose_q931.c */
|