107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
#include "ndef_message.h"
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namespace esphome {
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namespace nfc {
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static const char *TAG = "nfc.ndef_message";
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NdefMessage::NdefMessage(std::vector<uint8_t> &data) {
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ESP_LOGV(TAG, "Building NdefMessage with %zu bytes", data.size());
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uint8_t index = 0;
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while (index <= data.size()) {
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uint8_t tnf_byte = data[index++];
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bool me = tnf_byte & 0x40;
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bool sr = tnf_byte & 0x10;
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bool il = tnf_byte & 0x08;
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uint8_t tnf = tnf_byte & 0x07;
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ESP_LOGVV(TAG, "me=%s, sr=%s, il=%s, tnf=%d", YESNO(me), YESNO(sr), YESNO(il), tnf);
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auto record = new NdefRecord();
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record->set_tnf(tnf);
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uint8_t type_length = data[index++];
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uint32_t payload_length = 0;
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if (sr) {
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payload_length = data[index++];
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} else {
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payload_length = (static_cast<uint32_t>(data[index]) << 24) | (static_cast<uint32_t>(data[index + 1]) << 16) |
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(static_cast<uint32_t>(data[index + 2]) << 8) | static_cast<uint32_t>(data[index + 3]);
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index += 4;
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}
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uint8_t id_length = 0;
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if (il) {
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id_length = data[index++];
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}
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ESP_LOGVV(TAG, "Lengths: type=%d, payload=%d, id=%d", type_length, payload_length, id_length);
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std::string type_str(data.begin() + index, data.begin() + index + type_length);
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record->set_type(type_str);
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index += type_length;
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if (il) {
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std::string id_str(data.begin() + index, data.begin() + index + id_length);
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record->set_id(id_str);
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index += id_length;
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}
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uint8_t payload_identifier = 0x00;
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if (type_str == "U") {
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payload_identifier = data[index++];
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payload_length -= 1;
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}
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std::string payload_str(data.begin() + index, data.begin() + index + payload_length);
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if (payload_identifier > 0x00 && payload_identifier <= PAYLOAD_IDENTIFIERS_COUNT) {
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payload_str.insert(0, PAYLOAD_IDENTIFIERS[payload_identifier]);
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}
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record->set_payload(payload_str);
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index += payload_length;
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this->add_record(record);
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ESP_LOGV(TAG, "Adding record type %s = %s", record->get_type().c_str(), record->get_payload().c_str());
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if (me)
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break;
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}
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}
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bool NdefMessage::add_record(NdefRecord *record) {
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if (this->records_.size() >= MAX_NDEF_RECORDS) {
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ESP_LOGE(TAG, "Too many records. Max: %d", MAX_NDEF_RECORDS);
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return false;
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}
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this->records_.push_back(record);
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return true;
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}
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bool NdefMessage::add_text_record(const std::string &text) { return this->add_text_record(text, "en"); };
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bool NdefMessage::add_text_record(const std::string &text, const std::string &encoding) {
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std::string payload = to_string(text.length()) + encoding + text;
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auto r = new NdefRecord(TNF_WELL_KNOWN, "T", payload);
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return this->add_record(r);
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}
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bool NdefMessage::add_uri_record(const std::string &uri) {
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auto r = new NdefRecord(TNF_WELL_KNOWN, "U", uri);
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return this->add_record(r);
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}
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std::vector<uint8_t> NdefMessage::encode() {
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std::vector<uint8_t> data;
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for (uint8_t i = 0; i < this->records_.size(); i++) {
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auto encoded_record = this->records_[i]->encode(i == 0, (i + 1) == this->records_.size());
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data.insert(data.end(), encoded_record.begin(), encoded_record.end());
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}
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return data;
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}
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} // namespace nfc
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} // namespace esphome
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