kopia lustrzana https://github.com/espressif/esp-idf
227 wiersze
7.7 KiB
C
227 wiersze
7.7 KiB
C
![]() |
/* CBOR Example
|
||
|
|
||
|
This example code is in the Public Domain (or CC0 licensed, at your option.)
|
||
|
|
||
|
Unless required by applicable law or agreed to in writing, this
|
||
|
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
||
|
CONDITIONS OF ANY KIND, either express or implied.
|
||
|
*/
|
||
|
#include <stdio.h>
|
||
|
#include "esp_log.h"
|
||
|
#include "cbor.h"
|
||
|
|
||
|
static const char *TAG = "example";
|
||
|
|
||
|
#define CBOR_CHECK(a, str, goto_tag, ret_value, ...) \
|
||
|
do \
|
||
|
{ \
|
||
|
if ((a) != CborNoError) \
|
||
|
{ \
|
||
|
ESP_LOGE(TAG, "%s(%d): " str, __FUNCTION__, __LINE__, ##__VA_ARGS__); \
|
||
|
ret = ret_value; \
|
||
|
goto goto_tag; \
|
||
|
} \
|
||
|
} while (0)
|
||
|
|
||
|
static void indent(int nestingLevel)
|
||
|
{
|
||
|
while (nestingLevel--) {
|
||
|
printf(" ");
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void dumpbytes(const uint8_t *buf, size_t len)
|
||
|
{
|
||
|
while (len--) {
|
||
|
printf("%02X ", *buf++);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Decode CBOR data manuallly
|
||
|
*/
|
||
|
static CborError example_dump_cbor_buffer(CborValue *it, int nestingLevel)
|
||
|
{
|
||
|
CborError ret = CborNoError;
|
||
|
while (!cbor_value_at_end(it)) {
|
||
|
CborType type = cbor_value_get_type(it);
|
||
|
|
||
|
indent(nestingLevel);
|
||
|
switch (type) {
|
||
|
case CborArrayType: {
|
||
|
CborValue recursed;
|
||
|
assert(cbor_value_is_container(it));
|
||
|
puts("Array[");
|
||
|
ret = cbor_value_enter_container(it, &recursed);
|
||
|
CBOR_CHECK(ret, "enter container failed", err, ret);
|
||
|
ret = example_dump_cbor_buffer(&recursed, nestingLevel + 1);
|
||
|
CBOR_CHECK(ret, "recursive dump failed", err, ret);
|
||
|
ret = cbor_value_leave_container(it, &recursed);
|
||
|
CBOR_CHECK(ret, "leave container failed", err, ret);
|
||
|
indent(nestingLevel);
|
||
|
puts("]");
|
||
|
continue;
|
||
|
}
|
||
|
case CborMapType: {
|
||
|
CborValue recursed;
|
||
|
assert(cbor_value_is_container(it));
|
||
|
puts("Map{");
|
||
|
ret = cbor_value_enter_container(it, &recursed);
|
||
|
CBOR_CHECK(ret, "enter container failed", err, ret);
|
||
|
ret = example_dump_cbor_buffer(&recursed, nestingLevel + 1);
|
||
|
CBOR_CHECK(ret, "recursive dump failed", err, ret);
|
||
|
ret = cbor_value_leave_container(it, &recursed);
|
||
|
CBOR_CHECK(ret, "leave container failed", err, ret);
|
||
|
indent(nestingLevel);
|
||
|
puts("}");
|
||
|
continue;
|
||
|
}
|
||
|
case CborIntegerType: {
|
||
|
int64_t val;
|
||
|
ret = cbor_value_get_int64(it, &val);
|
||
|
CBOR_CHECK(ret, "parse int64 failed", err, ret);
|
||
|
printf("%lld\n", (long long)val);
|
||
|
break;
|
||
|
}
|
||
|
case CborByteStringType: {
|
||
|
uint8_t *buf;
|
||
|
size_t n;
|
||
|
ret = cbor_value_dup_byte_string(it, &buf, &n, it);
|
||
|
CBOR_CHECK(ret, "parse byte string failed", err, ret);
|
||
|
dumpbytes(buf, n);
|
||
|
puts("");
|
||
|
free(buf);
|
||
|
continue;
|
||
|
}
|
||
|
case CborTextStringType: {
|
||
|
char *buf;
|
||
|
size_t n;
|
||
|
ret = cbor_value_dup_text_string(it, &buf, &n, it);
|
||
|
CBOR_CHECK(ret, "parse text string failed", err, ret);
|
||
|
puts(buf);
|
||
|
free(buf);
|
||
|
continue;
|
||
|
}
|
||
|
case CborTagType: {
|
||
|
CborTag tag;
|
||
|
ret = cbor_value_get_tag(it, &tag);
|
||
|
CBOR_CHECK(ret, "parse tag failed", err, ret);
|
||
|
printf("Tag(%lld)\n", (long long)tag);
|
||
|
break;
|
||
|
}
|
||
|
case CborSimpleType: {
|
||
|
uint8_t type;
|
||
|
ret = cbor_value_get_simple_type(it, &type);
|
||
|
CBOR_CHECK(ret, "parse simple type failed", err, ret);
|
||
|
printf("simple(%u)\n", type);
|
||
|
break;
|
||
|
}
|
||
|
case CborNullType:
|
||
|
puts("null");
|
||
|
break;
|
||
|
case CborUndefinedType:
|
||
|
puts("undefined");
|
||
|
break;
|
||
|
case CborBooleanType: {
|
||
|
bool val;
|
||
|
ret = cbor_value_get_boolean(it, &val);
|
||
|
CBOR_CHECK(ret, "parse boolean type failed", err, ret);
|
||
|
puts(val ? "true" : "false");
|
||
|
break;
|
||
|
}
|
||
|
case CborHalfFloatType: {
|
||
|
uint16_t val;
|
||
|
ret = cbor_value_get_half_float(it, &val);
|
||
|
CBOR_CHECK(ret, "parse half float type failed", err, ret);
|
||
|
printf("__f16(%04x)\n", val);
|
||
|
break;
|
||
|
}
|
||
|
case CborFloatType: {
|
||
|
float val;
|
||
|
ret = cbor_value_get_float(it, &val);
|
||
|
CBOR_CHECK(ret, "parse float type failed", err, ret);
|
||
|
printf("%g\n", val);
|
||
|
break;
|
||
|
}
|
||
|
case CborDoubleType: {
|
||
|
double val;
|
||
|
ret = cbor_value_get_double(it, &val);
|
||
|
CBOR_CHECK(ret, "parse double float type failed", err, ret);
|
||
|
printf("%g\n", val);
|
||
|
break;
|
||
|
}
|
||
|
case CborInvalidType: {
|
||
|
ret = CborErrorUnknownType;
|
||
|
CBOR_CHECK(ret, "unknown cbor type", err, ret);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
ret = cbor_value_advance_fixed(it);
|
||
|
CBOR_CHECK(ret, "fix value failed", err, ret);
|
||
|
}
|
||
|
return CborNoError;
|
||
|
err:
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
|
||
|
void app_main(void)
|
||
|
{
|
||
|
CborEncoder root_encoder;
|
||
|
CborParser root_parser;
|
||
|
CborValue it;
|
||
|
uint8_t buf[100];
|
||
|
|
||
|
// Initialize the outermost cbor encoder
|
||
|
cbor_encoder_init(&root_encoder, buf, sizeof(buf), 0);
|
||
|
|
||
|
// Create an array containing several items
|
||
|
CborEncoder array_encoder;
|
||
|
CborEncoder map_encoder;
|
||
|
cbor_encoder_create_array(&root_encoder, &array_encoder, 5); // [
|
||
|
// 1. Create a map containing several pairs
|
||
|
cbor_encoder_create_map(&array_encoder, &map_encoder, 3); // {
|
||
|
// chip:esp32
|
||
|
cbor_encode_text_stringz(&map_encoder, "chip");
|
||
|
cbor_encode_text_stringz(&map_encoder, "esp32");
|
||
|
// unicore:false
|
||
|
cbor_encode_text_stringz(&map_encoder, "unicore");
|
||
|
cbor_encode_boolean(&map_encoder, false);
|
||
|
// ip:[192,168,1,100]
|
||
|
cbor_encode_text_stringz(&map_encoder, "ip");
|
||
|
CborEncoder array2;
|
||
|
cbor_encoder_create_array(&map_encoder, &array2, 4); // [
|
||
|
// Encode several numbers
|
||
|
cbor_encode_uint(&array2, 192);
|
||
|
cbor_encode_uint(&array2, 168);
|
||
|
cbor_encode_uint(&array2, 1);
|
||
|
cbor_encode_uint(&array2, 100);
|
||
|
cbor_encoder_close_container(&map_encoder, &array2); // ]
|
||
|
cbor_encoder_close_container(&array_encoder, &map_encoder); // }
|
||
|
// 2. Encode float number
|
||
|
cbor_encode_float(&array_encoder, 3.14);
|
||
|
// 3. Encode simple value
|
||
|
cbor_encode_simple_value(&array_encoder, 99);
|
||
|
// 4. Encode a string
|
||
|
cbor_encode_text_stringz(&array_encoder, "2019-07-10 09:00:00+0000");
|
||
|
// 5. Encode a undefined value
|
||
|
cbor_encode_undefined(&array_encoder);
|
||
|
cbor_encoder_close_container(&root_encoder, &array_encoder); // ]
|
||
|
|
||
|
// If error happend when encoding, then this value should be meaningless
|
||
|
ESP_LOGI(TAG, "encoded buffer size %d", cbor_encoder_get_buffer_size(&root_encoder, buf));
|
||
|
|
||
|
// Initialize the cbor parser and the value iterator
|
||
|
cbor_parser_init(buf, sizeof(buf), 0, &root_parser, &it);
|
||
|
|
||
|
ESP_LOGI(TAG, "convert CBOR to JSON");
|
||
|
// Dump the values in JSON format
|
||
|
cbor_value_to_json(stdout, &it, 0);
|
||
|
puts("");
|
||
|
|
||
|
ESP_LOGI(TAG, "decode CBOR manually");
|
||
|
// Decode CBOR data manully
|
||
|
example_dump_cbor_buffer(&it, 0);
|
||
|
}
|