I'm trying to build a C++ wrapper around libnfc to make a communication between my Android and the PN532 RFID module.
This helped me a lot: http://nfc-tools.org/index.php/Libnfc:APDU_example
This code is meant to send an APDU command where the body is contained in message
(I'm not sending any header bytes etc.) and read the response into response
.
Problem: If message
exceeds 262 characters then I get a buffer overflow detected error. Otherwise it works perfectly well. I don't even think the error is thrown by the NFC library.
bool send(const std::string &message, std::string &response){
std::vector<uint8_t> apduCmd(message.begin(), message.end());
uint8_t *capdu = &apduCmd[0];
size_t capdulen = apduCmd.size();
uint8_t rapdu[10];
size_t rapdulen = 10;
// BUFFER OVERFLOW HERE
int res = nfc_initiator_transceive_bytes(m_nfcDevice, capdu, capdulen, rapdu, rapdulen, 500);
if (res<0) {
return false;
}
if(res<2 || rapdu[res-2] != 0x90 || rapdu[res-1] != 0x00){
return false;
}
// byteArrayToString omitting the last two bytes
response = byteArrayToString(rapdu, 0, res-2);
return true;
}