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iot/zoap: Add helpers for dealing with integer options

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A good number of option values represent numbers, so add these helpers
so applications can avoid repeating this.

Change-Id: Ied2a844c51808dcafe751a77492d00f2063de7d6
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
This commit is contained in:
Vinicius Costa Gomes 2016-09-14 11:23:57 -03:00 • committed by Anas Nashif
commit 7079a18267
2 changed files with 63 additions and 16 deletions
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65
lib/iot/zoap/zoap.c
View file

@ -557,6 +557,28 @@ int zoap_handle_request(struct zoap_packet *pkt,
return -ENOENT;
}
unsigned int zoap_option_value_to_int(const struct zoap_option *option)
{
switch (option->len) {
case 0:
return 0;
case 1:
return option->value[0];
case 2:
return (option->value[0] << 0) | (option->value[1] << 8);
case 3:
return (option->value[0] << 0) | (option->value[1] << 8) |
(option->value[2] << 16);
case 4:
return (option->value[0] << 0) | (option->value[1] << 8) |
(option->value[2] << 16) | (option->value[3] << 24);
default:
return 0;
}
return 0;
}
static int get_observe_option(const struct zoap_packet *pkt)
{
struct zoap_option option = {};
@ -568,22 +590,7 @@ static int get_observe_option(const struct zoap_packet *pkt)
return -ENOENT;
}
/* The value is in the network order, and has at max 3 bytes. */
switch (option.len) {
case 0:
return 0;
case 1:
return option.value[0];
case 2:
return (option.value[0] << 0) | (option.value[1] << 8);
case 3:
return (option.value[0] << 0) | (option.value[1] << 8) |
(option.value[2] << 16);
default:
return -EINVAL;
}
return -ENOENT;
return zoap_option_value_to_int(&option);
}
struct zoap_reply *zoap_response_received(
@ -807,6 +814,32 @@ int zoap_add_option(struct zoap_packet *pkt, uint16_t code,
return 0;
}
int zoap_add_option_int(struct zoap_packet *pkt, uint16_t code,
unsigned int val)
{
uint8_t data[4], len;
if (val == 0) {
data[0] = 0;
len = 0;
} else if (val < 0xFF) {
data[0] = (uint8_t) val;
len = 1;
} else if (val < 0xFFFF) {
sys_put_be16(val, data);
len = 2;
} else if (val < 0xFFFFFF) {
sys_put_be16(val, data);
data[2] = val >> 16;
len = 3;
} else {
sys_put_be32(val, data);
len = 4;
}
return zoap_add_option(pkt, code, data, len);
}
int zoap_find_options(const struct zoap_packet *pkt, uint16_t code,
struct zoap_option *options, uint16_t veclen)
{

14
lib/iot/zoap/zoap.h
View file

@ -382,6 +382,20 @@ int zoap_packet_set_used(struct zoap_packet *pkt, uint16_t len);
int zoap_add_option(struct zoap_packet *pkt, uint16_t code,
const void *value, uint16_t len);
/**
* Converts an option to its integer representation. It assumes that
* the number is encoded in the network byte order in the option.
*/
unsigned int zoap_option_value_to_int(const struct zoap_option *option);
/**
* Adds an integer value option to the packet. The option must be
* added in numeric order of their codes, and the least amount of
* bytes will be used to encode the value.
*/
int zoap_add_option_int(struct zoap_packet *pkt, uint16_t code,
unsigned int val);
/**
* Return the values associated with the option of value @a code.
*/