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/**

 * @file

 * Abstract Syntax Notation One (ISO 8824, 8825) codec.

 */

/*

 * Copyright (c) 2006 Axon Digital Design B.V., The Netherlands.

 * All rights reserved.

 *

 * 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.

 * 3. The name of the author may not be used to endorse or promote products

 *    derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.

 *

 * Author: Christiaan Simons <christiaan.simons@axon.tv>

 */

#ifndef __LWIP_SNMP_ASN1_H__

#define __LWIP_SNMP_ASN1_H__

#include "lwip/opt.h"

#include "arch/cc.h"

#include "lwip/err.h"

#include "lwip/pbuf.h"

#include "lwip/snmp.h"

#define SNMP_ASN1_UNIV   (!0x80 | !0x40)

#define SNMP_ASN1_APPLIC (!0x80 |  0x40)

#define SNMP_ASN1_CONTXT ( 0x80 | !0x40)

#define SNMP_ASN1_CONSTR (0x20)

#define SNMP_ASN1_PRIMIT (!0x20)

/* universal tags */

#define SNMP_ASN1_INTEG  2

#define SNMP_ASN1_OC_STR 4

#define SNMP_ASN1_NUL    5

#define SNMP_ASN1_OBJ_ID 6

#define SNMP_ASN1_SEQ    16

/* application specific (SNMP) tags */

#define SNMP_ASN1_IPADDR 0    /* octet string size(4) */

#define SNMP_ASN1_COUNTER 1   /* u32_t */

#define SNMP_ASN1_GAUGE 2     /* u32_t */

#define SNMP_ASN1_TIMETICKS 3 /* u32_t */

#define SNMP_ASN1_OPAQUE 4    /* octet string */

/* context specific (SNMP) tags */

#define SNMP_ASN1_PDU_GET_REQ 0

#define SNMP_ASN1_PDU_GET_NEXT_REQ 1

#define SNMP_ASN1_PDU_GET_RESP 2

#define SNMP_ASN1_PDU_SET_REQ 3

#define SNMP_ASN1_PDU_TRAP 4

err_t snmp_asn1_dec_type(struct pbuf *p, u16_t ofs, u8_t *type);

err_t snmp_asn1_dec_length(struct pbuf *p, u16_t ofs, u8_t *octets_used, u16_t *length);

err_t snmp_asn1_dec_u32t(struct pbuf *p, u16_t ofs, u16_t len, u32_t *value);

err_t snmp_asn1_dec_s32t(struct pbuf *p, u16_t ofs, u16_t len, s32_t *value);

err_t snmp_asn1_dec_oid(struct pbuf *p, u16_t ofs, u16_t len, struct snmp_obj_id *oid);

err_t snmp_asn1_dec_raw(struct pbuf *p, u16_t ofs, u16_t len, u16_t raw_len, u8_t *raw);

void snmp_asn1_enc_length_cnt(u16_t length, u8_t *octets_needed);

void snmp_asn1_enc_u32t_cnt(u32_t value, u16_t *octets_needed);

void snmp_asn1_enc_s32t_cnt(s32_t value, u16_t *octets_needed);

void snmp_asn1_enc_oid_cnt(u8_t ident_len, s32_t *ident, u16_t *octets_needed);

err_t snmp_asn1_enc_type(struct pbuf *p, u16_t ofs, u8_t type);

err_t snmp_asn1_enc_length(struct pbuf *p, u16_t ofs, u16_t length);

err_t snmp_asn1_enc_u32t(struct pbuf *p, u16_t ofs, u8_t octets_needed, u32_t value);

err_t snmp_asn1_enc_s32t(struct pbuf *p, u16_t ofs, u8_t octets_needed, s32_t value);

err_t snmp_asn1_enc_oid(struct pbuf *p, u16_t ofs, u8_t ident_len, s32_t *ident);

err_t snmp_asn1_enc_raw(struct pbuf *p, u16_t ofs, u8_t raw_len, u8_t *raw);

#endif