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