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+/* CBOR Example
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+
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+ This example code is in the Public Domain (or CC0 licensed, at your option.)
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+
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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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+
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+static const char *TAG = "example";
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+
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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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+
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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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+
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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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+/**
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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suda-morris