block.h
Go to the documentation of this file.
/*
* block.h -- block transfer
*
* Copyright (C) 2010-2012,2014-2015 Olaf Bergmann <bergmann@tzi.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* This file is part of the CoAP library libcoap. Please see README for terms
* of use.
*/
#ifndef COAP_BLOCK_H_
#define COAP_BLOCK_H_
#include "encode.h"
#include "option.h"
#include "pdu.h"
#ifndef COAP_MAX_BLOCK_SZX
#define COAP_MAX_BLOCK_SZX 6
#endif /* COAP_MAX_BLOCK_SZX */
typedef struct {
unsigned int num;
unsigned int m:1;
unsigned int szx:3;
} coap_block_t;
#define COAP_BLOCK_USE_LIBCOAP 0x01 /* Use libcoap to do block requests */
#define COAP_BLOCK_SINGLE_BODY 0x02 /* Deliver the data as a single body */
#define COAP_OPT_BLOCK_LAST(opt) \
(coap_opt_length(opt) ? (coap_opt_value(opt) + (coap_opt_length(opt)-1)) : 0)
#define COAP_OPT_BLOCK_MORE(opt) \
(coap_opt_length(opt) ? (*COAP_OPT_BLOCK_LAST(opt) & 0x08) : 0)
#define COAP_OPT_BLOCK_SZX(opt) \
(coap_opt_length(opt) ? (*COAP_OPT_BLOCK_LAST(opt) & 0x07) : 0)
unsigned int coap_opt_block_num(const coap_opt_t *block_opt);
COAP_STATIC_INLINE int
coap_more_blocks(size_t data_len, unsigned int num, uint16_t szx) {
return ((num+1) << (szx + 4)) < data_len;
}
#if 0
COAP_STATIC_INLINE void
coap_opt_block_set_m(coap_opt_t *block_opt, int m) {
if (m)
*(coap_opt_value(block_opt) + (coap_opt_length(block_opt) - 1)) |= 0x08;
else
*(coap_opt_value(block_opt) + (coap_opt_length(block_opt) - 1)) &= ~0x08;
}
#endif
int coap_get_block(const coap_pdu_t *pdu, coap_option_num_t number,
coap_block_t *block);
int coap_write_block_opt(coap_block_t *block,
coap_option_num_t number,
coap_pdu_t *pdu,
size_t data_length);
int coap_add_block(coap_pdu_t *pdu,
size_t len,
const uint8_t *data,
unsigned int block_num,
unsigned char block_szx);
coap_binary_t *
coap_block_build_body(coap_binary_t *body_data, size_t length,
const uint8_t *data, size_t offset, size_t total);
void
coap_add_data_blocked_response(const coap_pdu_t *request,
coap_pdu_t *response,
uint16_t media_type,
int maxage,
size_t length,
const uint8_t* data);
typedef void (*coap_release_large_data_t)(coap_session_t *session,
void *app_ptr);
int coap_add_data_large_request(coap_session_t *session,
coap_pdu_t *pdu,
size_t length,
const uint8_t *data,
coap_release_large_data_t release_func,
void *app_ptr);
int
coap_add_data_large_response(coap_resource_t *resource,
coap_session_t *session,
const coap_pdu_t *request,
coap_pdu_t *response,
const coap_string_t *query,
uint16_t media_type,
int maxage,
uint64_t etag,
size_t length,
const uint8_t *data,
coap_release_large_data_t release_func,
void *app_ptr);
void coap_context_set_block_mode(coap_context_t *context,
uint8_t block_mode);
int coap_cancel_observe(coap_session_t *session, coap_binary_t *token,
coap_pdu_type_t message_type);
#endif /* COAP_BLOCK_H_ */
encode.h
coap_context_set_block_mode
void coap_context_set_block_mode(coap_context_t *context, uint8_t block_mode)
Set the context level CoAP block handling bits for handling RFC7959.
Definition: block.c:249
coap_add_data_large_request
int coap_add_data_large_request(coap_session_t *session, coap_pdu_t *pdu, size_t length, const uint8_t *data, coap_release_large_data_t release_func, void *app_ptr)
Associates given data with the pdu that is passed as second parameter.
Definition: block.c:627
coap_add_block
int coap_add_block(coap_pdu_t *pdu, size_t len, const uint8_t *data, unsigned int block_num, unsigned char block_szx)
Adds the block_num block of size 1 << (block_szx + 4) from source data to pdu.
Definition: block.c:127
coap_block_build_body
coap_binary_t * coap_block_build_body(coap_binary_t *body_data, size_t length, const uint8_t *data, size_t offset, size_t total)
Re-assemble payloads into a body.
Definition: block.c:1559
coap_release_large_data_t
void(* coap_release_large_data_t)(coap_session_t *session, void *app_ptr)
Callback handler for de-allocating the data based on app_ptr provided to coap_add_data_large_*() func...
Definition: block.h:197
coap_add_data_blocked_response
void coap_add_data_blocked_response(const coap_pdu_t *request, coap_pdu_t *response, uint16_t media_type, int maxage, size_t length, const uint8_t *data)
Adds the appropriate part of data to the response pdu.
Definition: block.c:144
coap_more_blocks
COAP_STATIC_INLINE int coap_more_blocks(size_t data_len, unsigned int num, uint16_t szx)
Checks if more than num blocks are required to deliver data_len bytes of data for a block size of 1 <...
Definition: block.h:70
coap_opt_block_num
unsigned int coap_opt_block_num(const coap_opt_t *block_opt)
Returns the value of field num in the given block option block_opt.
Definition: block.c:18
coap_get_block
int coap_get_block(const coap_pdu_t *pdu, coap_option_num_t number, coap_block_t *block)
Initializes block from pdu.
Definition: block.c:37
coap_write_block_opt
int coap_write_block_opt(coap_block_t *block, coap_option_num_t number, coap_pdu_t *pdu, size_t data_length)
Writes a block option of type number to message pdu.
Definition: block.c:66
coap_cancel_observe
int coap_cancel_observe(coap_session_t *session, coap_binary_t *token, coap_pdu_type_t message_type)
Cancel an observe that is being tracked by the client large receive logic.
Definition: block.c:279
coap_add_data_large_response
int coap_add_data_large_response(coap_resource_t *resource, coap_session_t *session, const coap_pdu_t *request, coap_pdu_t *response, const coap_string_t *query, uint16_t media_type, int maxage, uint64_t etag, size_t length, const uint8_t *data, coap_release_large_data_t release_func, void *app_ptr)
Associates given data with the response pdu that is passed as fourth parameter.
Definition: block.c:638
coap_opt_length
uint32_t coap_opt_length(const coap_opt_t *opt)
Returns the length of the given option.
Definition: option.c:211
coap_opt_value
const uint8_t * coap_opt_value(const coap_opt_t *opt)
Returns a pointer to the value of the given option.
Definition: option.c:248
coap_pdu_type_t
coap_pdu_type_t
CoAP PDU message type definitions.
Definition: pdu.h:56
COAP_STATIC_INLINE
#define COAP_STATIC_INLINE
Definition: libcoap.h:40
option.h
Helpers for handling options in CoAP PDUs.
coap_option_num_t
uint16_t coap_option_num_t
Definition: option.h:20
coap_opt_t
uint8_t coap_opt_t
Use byte-oriented access methods here because sliding a complex struct coap_opt_t over the data buffe...
Definition: option.h:26
pdu.h
Pre-defined constants that reflect defaults for CoAP.
coap_binary_t
CoAP binary data definition.
Definition: str.h:50
coap_block_t
Structure of Block options.
Definition: block.h:35
coap_block_t::num
unsigned int num
block number
Definition: block.h:36
coap_block_t::szx
unsigned int szx
block size
Definition: block.h:38
coap_block_t::m
unsigned int m
1 if more blocks follow, 0 otherwise
Definition: block.h:37
coap_context_t
The CoAP stack's global state is stored in a coap_context_t object.
Definition: coap_net_internal.h:45
coap_pdu_t
structure for CoAP PDUs token, if any, follows the fixed size header, then options until payload mark...
Definition: coap_pdu_internal.h:94
coap_resource_t
Abstraction of resource that can be attached to coap_context_t.
Definition: coap_resource_internal.h:42
coap_session_t
Abstraction of virtual session that can be attached to coap_context_t (client) or coap_endpoint_t (se...
Definition: coap_session_internal.h:48
coap_string_t
CoAP string data definition.
Definition: str.h:32