mirror of https://github.com/esphome/esphome.git
88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
#include "api_message.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace api {
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static const char *TAG = "api.message";
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bool APIMessage::decode_varint(uint32_t field_id, uint32_t value) { return false; }
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bool APIMessage::decode_length_delimited(uint32_t field_id, const uint8_t *value, size_t len) { return false; }
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bool APIMessage::decode_32bit(uint32_t field_id, uint32_t value) { return false; }
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void APIMessage::encode(APIBuffer &buffer) {}
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void APIMessage::decode(const uint8_t *buffer, size_t length) {
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uint32_t i = 0;
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bool error = false;
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while (i < length) {
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uint32_t consumed;
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auto res = proto_decode_varuint32(&buffer[i], length - i, &consumed);
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if (!res.has_value()) {
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ESP_LOGV(TAG, "Invalid field start at %u", i);
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break;
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}
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uint32_t field_type = (*res) & 0b111;
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uint32_t field_id = (*res) >> 3;
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i += consumed;
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switch (field_type) {
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case 0: { // VarInt
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res = proto_decode_varuint32(&buffer[i], length - i, &consumed);
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if (!res.has_value()) {
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ESP_LOGV(TAG, "Invalid VarInt at %u", i);
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error = true;
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break;
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}
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if (!this->decode_varint(field_id, *res)) {
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ESP_LOGV(TAG, "Cannot decode VarInt field %u with value %u!", field_id, *res);
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}
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i += consumed;
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break;
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}
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case 2: { // Length-delimited
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res = proto_decode_varuint32(&buffer[i], length - i, &consumed);
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if (!res.has_value()) {
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ESP_LOGV(TAG, "Invalid Length Delimited at %u", i);
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error = true;
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break;
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}
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i += consumed;
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if (*res > length - i) {
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ESP_LOGV(TAG, "Out-of-bounds Length Delimited at %u", i);
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error = true;
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break;
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}
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if (!this->decode_length_delimited(field_id, &buffer[i], *res)) {
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ESP_LOGV(TAG, "Cannot decode Length Delimited field %u!", field_id);
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}
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i += *res;
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break;
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}
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case 5: { // 32-bit
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if (length - i < 4) {
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ESP_LOGV(TAG, "Out-of-bounds Fixed32-bit at %u", i);
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error = true;
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break;
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}
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uint32_t val = (uint32_t(buffer[i]) << 0) | (uint32_t(buffer[i + 1]) << 8) | (uint32_t(buffer[i + 2]) << 16) |
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(uint32_t(buffer[i + 3]) << 24);
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if (!this->decode_32bit(field_id, val)) {
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ESP_LOGV(TAG, "Cannot decode 32-bit field %u with value %u!", field_id, val);
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}
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i += 4;
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break;
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}
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default:
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ESP_LOGV(TAG, "Invalid field type at %u", i);
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error = true;
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break;
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}
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if (error) {
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break;
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}
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}
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}
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} // namespace api
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} // namespace esphome
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