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NDEF.cpp
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NDEF.cpp
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/**************************************************************************/
/*!
@file PN532_I2C.h
@author Odopod, a Nurun Company
@license BSD
*/
/**************************************************************************/
#include "NDEF.h"
NDEF::NDEF(){
}
/**
* Parse the actual NDEF message and call specific handlers for dealing with
* a particular type of NDEF message.
*
* @param msg The NDEF message
* @return struct FOUND_MESSAGE which contains type, format, and the actual payload
*/
FOUND_MESSAGE NDEF::decode_message(uint8_t * msg) {
int offset = 2;
FOUND_MESSAGE m;
bool mb = (*(msg + offset) & 0x80) == 0x80; /* Message Begin */
bool me = (*(msg + offset) & 0x40) == 0x40; /* Message End */
bool cf = (*(msg + offset) & 0x20) == 0x20; /* Chunk Flag */
bool sr = (*(msg + offset) & 0x10) == 0x10; /* Short Record */
bool il = (*(msg + offset) & 0x08) == 0x08; /* ID Length Present */
uint8_t tnf = (*(msg + offset) & 0x07);
offset++;
#ifdef NDEFDEBUG
Serial.print("MB:"); Serial.println(mb, DEC);
Serial.print("ME:"); Serial.println(me, DEC);
Serial.print("CF:"); Serial.println(cf, DEC);
Serial.print("SR:"); Serial.println(sr, DEC);
Serial.print("IL:"); Serial.println(il, DEC);
Serial.print("TNF:"); Serial.println(tnf, HEX);
#endif
if (cf) {
Serial.println("chunk flag not supported yet");
m.type = 0;
return m;
}
int typeLength = *(msg + offset);
offset++;
int payloadLength;
if (sr) {
payloadLength = *(msg + offset);
payloadLength = (payloadLength < 0) ? payloadLength + 256 : payloadLength;
offset++;
} else {
offset += 4;
}
int idLength = 0;
if (il) {
idLength = *(msg + offset);
offset++;
}
switch ((int)tnf) {
case 1:
//well known record type
m.type = *(msg + offset);
offset += typeLength;
if (il) {
offset += idLength;
}
memcpy(msg, msg + offset, payloadLength);
offset += payloadLength;
char lang [3];
char text [NDEF_BUFFER_SIZE];
char uri [NDEF_BUFFER_SIZE];
switch (m.type) {
case NDEF_TYPE_URI:
if(parse_uri(msg, payloadLength, uri)){
// Serial.print("uri: "); Serial.println(uri);
m.format = (char *)(uint8_t)msg[0];
m.payload = (uint8_t*)uri;
}
break;
case NDEF_TYPE_TEXT:
if(parse_text(msg, payloadLength, lang, text)) {
// Serial.print("lang: "); Serial.println(lang);
// Serial.print("text: "); Serial.println(text);
m.format = (char *)(uint8_t*)lang;
m.payload = (uint8_t*)text;
}
break;
default:
Serial.println("err, NDEF type: "); Serial.println((char)m.type);
break;
}
break;
case 2:
//mime type record
m.type = NDEF_TYPE_MIME;
char mimetype [typeLength-2];
uint8_t payload [NDEF_BUFFER_SIZE];
memcpy(mimetype, msg+offset, typeLength);
memcpy(payload, msg +typeLength +offset, payloadLength - typeLength);
// Serial.print("mimetype: "); Serial.println(mimetype);
// Serial.print("data: "); Serial.println((char*)payload);
m.format = mimetype;
m.payload = payload;
break;
default:
Serial.println("err");
break;
}
return m;
}
/**
* encodes the URI message attaches the proper formatted header and terminating character
*
* @param uriPrefix URI prefix char
* @param msg the payload
* @return length of the encoded message
*/
uint8_t NDEF::encode_URI(uint8_t uriPrefix, uint8_t * msg){
uint8_t len = strlen((char *)msg);
uint8_t record_header = encode_record_header(1, 1, 0, 1, 0, NDEF_WELL_KNOWN_RECORD);
uint8_t payload_head[7] = {0x03, len+5, record_header, 0x01, len+1, 0x55, uriPrefix};
const uint8_t term[1] ={0xFE};
memmove(msg+7, msg, len);
memcpy(msg+0, payload_head, 7);
memcpy(msg + len + 7, term , 1);
#ifdef DEBUG
for (uint8_t i = 0 ; i < len + 8; i++) {
Serial.print(msg[i], HEX);Serial.print(" ");
}
Serial.println("");
#endif
return len + 8;
}
/**
* encodes the TEXT message attaches the proper formatted header and terminating character
*
* @param lang 2 letter language code ie 'en, de, es'
* @param msg the payload
* @return length of the encoded message
*/
uint8_t NDEF::encode_TEXT(uint8_t * lang, uint8_t * msg){
uint8_t len = strlen((char *)msg);
uint8_t record_header = encode_record_header(1, 1, 0, 1, 0, NDEF_WELL_KNOWN_RECORD);
uint8_t payload_head[9] = {0x03, len+7, record_header, 0x01, len+3, 0x54, 0x02, lang[0], lang[1]};
const uint8_t term[1] ={0xFE};
memmove(msg + 9, msg, len);
memcpy(msg, payload_head, 9);
memcpy(msg + 9 + len, term , 1);
#ifdef DEBUG
for (uint8_t i = 0 ; i < len + 10; i++) {
Serial.print(msg[i], HEX);Serial.print(" ");
}
Serial.println("");
#endif
return len + 10;
}
/**
* encodes the MIME message attaches the proper formatted header and terminating character
*
* @param mimetype char array of the mimetype ie "image/gif"
* @param data the payload
* @param length length of the payload
* @return length of the encoded message
*/
uint8_t NDEF::encode_MIME(uint8_t * mimetype, uint8_t * data, uint8_t len){
uint8_t typeLen = strlen((char *) mimetype);
uint8_t record_header = encode_record_header(1, 1, 0, 1, 0, NDEF_MIME_TYPE_RECORD);
uint8_t payload_head[5] = {0x03, len + typeLen + 3, record_header, typeLen, len};
const uint8_t term[1] ={0xFE};
memmove(data + 5 + typeLen, data, len);
memcpy(data, payload_head, 5);
memcpy(data + 5, mimetype, typeLen);
memcpy(data + 5 + typeLen + len, term , 1);
return typeLen + len + 6;
}
/**
* helper function to create the binary encoded header type byte for the ndef header
*
* @param mb Message Begin
* @param me Message End
* @param cf Chunk Flag
* @param sr Short Record
* @param il ID Length Present
* @param tnf Type Name Field
* @return binary encoded header type byte (ie D1, D2, etc)
*/
uint8_t NDEF::encode_record_header(bool mb, bool me, bool cf, bool sr, bool il, uint8_t tnf){
uint8_t record_header = 0;
if(mb)
record_header += 0x80;
if(me)
record_header += 0x40;
if(cf)
record_header += 0x20;
if(sr)
record_header += 0x10;
if(il)
record_header += 0x08;
record_header += tnf;
return record_header;
}
/**
* Convert type of URI to the actual URI prefix to be used in conjunction
* with the URI stored in the NDEF record itself. This is specified in section
* 3.2.2 "URI Identifier Code" of "URI Record Type Definition Technical
* Specification".
*
* !!! comment out ones you don't want to support to save memory size, they add up to alot!
*
* @param b the code of the URI to convert to the actual prefix
* @return the URI prefix
*/
char * NDEF::get_uri_prefix(uint8_t b)
{
switch (b) {
case 0x00:
return "";
case 0x01:
return "http://www.";
case 0x02:
return "https://www.";
case 0x03:
return "http://";
case 0x04:
return "https://";
case 0x05:
return "tel:";
case 0x06:
return "mailto:";
// case 0x07:
// return "ftp://anonymous:anonymous@";
// case 0x08:
// return "ftp://ftp.";
// case 0x09:
// return "ftps://";
// case 0x0A:
// return "sftp://";
case 0x0B:
return "smb://";
// case 0x0C:
// return "nfs://";
// case 0x0D:
// return "ftp://";
// case 0x0E:
// return "dav://";
// case 0x0F:
// return "news:";
// case 0x10:
// return "telnet://";
// case 0x11:
// return "imap:";
// case 0x12:
// return "rtsp://";
// case 0x13:
// return "urn:";
// case 0x14:
// return "pop:";
// case 0x15:
// return "sip:";
// case 0x16:
// return "sips:";
// case 0x17:
// return "tftp:";
// case 0x18:
// return "btspp://";
// case 0x19:
// return "btl2cap://";
// case 0x1A:
// return "btgoep://";
// case 0x1B:
// return "tcpobex://";
// case 0x1C:
// return "irdaobex://";
case 0x1D:
return "file://";
// case 0x1E:
// return "urn:epc:id:";
// case 0x1F:
// return "urn:epc:tag:";
// case 0x20:
// return "urn:epc:pat:";
// case 0x21:
// return "urn:epc:raw:";
// case 0x22:
// return "urn:epc:";
// case 0x23:
// return "urn:nfc:";
default:
return "unknown";
}
}
/**
* Concatenates the prefix with the contents of the NDEF URI record.
*
* @param payload The NDEF URI payload
* @param payload_len The length of the NDEF URI payload
* @return The full reconstructed URI
*/
bool NDEF::parse_uri(uint8_t * payload, int payload_len, char * uri ){
char * prefix = get_uri_prefix(payload[0]);
int prefix_len = strlen(prefix);
memcpy(uri, prefix, prefix_len);
memcpy(uri + prefix_len, payload + 1, payload_len - 1);
*(uri + prefix_len + payload_len - 1) = 0x00;
return true;
}
/**
* Concatenates the lang prefix with the contents of the NDEF TEXT record.
*
* @param payload The NDEF Text Record payload
* @param payload_len The length of the NDEF Text Record payload
* @param lang The IANA language code lenght
* @param text The text contained in NDEF Text Record
* @return Success or not.
*/
bool NDEF::parse_text(uint8_t * payload, int payload_len, char * lang, char * text){
memcpy(lang, payload + 1, 2);
*(lang + 2) = 0x00;
const int text_len = payload_len - 3;
memcpy(text, payload + 3, text_len);
*(text + text_len) = 0x00;
return true;
}