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/* Copyright (c) 2014, Robert Escriva
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of this project nor the names of its contributors may
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#ifndef macaroons_packet_h_
#define macaroons_packet_h_
/* c */
#include <stddef.h>
#define PACKET_PREFIX 4
#define PACKET_SIZE(KEY, VAL) (PACKET_PREFIX + STRLENOF(KEY) + (VAL) + 2)
#define PACKET_MAX_SIZE 65535
#define NULL_PACKET {NULL, 0};
#define EMPTY_PACKET {(const unsigned char*)"0004", 4}
struct packet
{
const unsigned char* data;
size_t size;
};
const unsigned char*
parse_packet(const unsigned char* ptr,
const unsigned char* const end,
struct packet* pkt);
/* 0 if equal; !0 if non-equal; no other comparison implied */
int
packet_cmp(const struct packet* lhs,
const struct packet* rhs);
/* A key-value packet has this form:
* <4 byte header><key><space><value><new-line>
*/
unsigned char*
create_kv_packet(const unsigned char* key, size_t key_sz,
const unsigned char* val, size_t val_sz,
struct packet* pkt, unsigned char* ptr);
int
parse_kv_packet(const struct packet* pkt,
const unsigned char** key, size_t* key_sz,
const unsigned char** val, size_t* val_sz);
/* copy a packet to the memory pointed to by ptr */
unsigned char*
copy_packet(const struct packet* from,
struct packet* to,
unsigned char* ptr);
unsigned char*
serialize_packet(const struct packet* from,
unsigned char* ptr);
int
copy_if_parses(const unsigned char** rptr,
const unsigned char* const end,
int (*f)(const struct packet* pkt,
const unsigned char** s, size_t* s_sz),
struct packet* to,
unsigned char** wptr);
/* create a location packet */
unsigned char*
create_location_packet(const unsigned char* location, size_t location_sz,
struct packet* pkt, unsigned char* ptr);
int
parse_location_packet(const struct packet* pkt,
const unsigned char** location, size_t* location_sz);
/* create a identifier packet */
unsigned char*
create_identifier_packet(const unsigned char* identifier, size_t identifier_sz,
struct packet* pkt, unsigned char* ptr);
int
parse_identifier_packet(const struct packet* pkt,
const unsigned char** identifier, size_t* identifier_sz);
/* create a signature packet */
unsigned char*
create_signature_packet(const unsigned char* signature, size_t sig_sz,
struct packet* pkt, unsigned char* ptr);
int
parse_signature_packet(const struct packet* pkt,
const unsigned char** signature);
/* caveat packets */
unsigned char*
create_cid_packet(const unsigned char* cid, size_t cid_sz,
struct packet* pkt, unsigned char* ptr);
int
parse_cid_packet(const struct packet* pkt,
const unsigned char** cid, size_t* cid_sz);
unsigned char*
create_vid_packet(const unsigned char* vid, size_t vid_sz,
struct packet* pkt, unsigned char* ptr);
int
parse_vid_packet(const struct packet* pkt,
const unsigned char** vid, size_t* vid_sz);
unsigned char*
create_cl_packet(const unsigned char* cl, size_t cl_sz,
struct packet* pkt, unsigned char* ptr);
int
parse_cl_packet(const struct packet* pkt,
const unsigned char** cl, size_t* cl_sz);
#endif /* macaroons_packet_h_ */
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