ndef_record_text.cpp

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#include "ndef_record_text.h"
#include "ndef_record.h"
 
namespace esphome::nfc {
 
static const char *const TAG = "nfc.ndef_record_text";
 
NdefRecordText::NdefRecordText(const std::vector<uint8_t> &payload) {
  if (payload.empty()) {
    ESP_LOGE(TAG, "Record payload too short");
    return;
  }
 
  uint8_t language_code_length = payload[0] & 0b00111111;  // Todo, make use of encoding bit?
 
  if (1 + language_code_length > payload.size()) {
    ESP_LOGE(TAG, "Record payload too short for language code");
    return;
  }
 
  this->language_code_ = std::string(payload.begin() + 1, payload.begin() + 1 + language_code_length);
 
  this->text_ = std::string(payload.begin() + 1 + language_code_length, payload.end());
 
  this->tnf_ = TNF_WELL_KNOWN;
 
  this->type_ = "T";
}
 
std::vector<uint8_t> NdefRecordText::get_encoded_payload() {
  std::vector<uint8_t> data;
 
  uint8_t flag_byte = this->language_code_.length() & 0b00111111;  // UTF8 assumed
 
  data.push_back(flag_byte);
 
  data.insert(data.end(), this->language_code_.begin(), this->language_code_.end());
 
  data.insert(data.end(), this->text_.begin(), this->text_.end());
  return data;
}
 
}  // namespace esphome::nfc