ST / NDefLib

Utility library to read and write Ndef messages from/to a Type4 NFC tag

Dependents:   NFC M2M_2016_STM32 MyongjiElec_capstone1 IDW01M1_Cloud_IBM ... more

Fork of NDefLib by ST Expansion SW Team

NDEF NFC library

This library provides an abstract API to create NDEF formatted messages and records and to read/write them from/to a Type4 NFC Tag.

Implementations

At the moment, the NDEF API is implemented by X_NUCLEO_NFC01A1 and X_NUCLEO_NFC02A1 Dynamic NFC Tag libraries respectively driving the X-NUCLEO-NFC01A1 and X-NUCLEO-NFC02A1 boards.

Message.cpp@0:04b82ae7aa43, 2015-11-19 (annotated)

Committer:
giovannivisentini
Date:
Thu Nov 19 08:49:47 2015 +0000
Revision:
0:04b82ae7aa43
Child:
1:a0eeb478a45a
First Version, the tag is only write

Who changed what in which revision?

UserRevisionLine numberNew contents of line
giovannivisentini 0:04b82ae7aa43 1 /*
giovannivisentini 0:04b82ae7aa43 2 * Message.cpp
giovannivisentini 0:04b82ae7aa43 3 *
giovannivisentini 0:04b82ae7aa43 4 * Created on: Nov 6, 2015
giovannivisentini 0:04b82ae7aa43 5 * Author: giovanni visentini
giovannivisentini 0:04b82ae7aa43 6 */
giovannivisentini 0:04b82ae7aa43 7
giovannivisentini 0:04b82ae7aa43 8 #include <cstdlib>
giovannivisentini 0:04b82ae7aa43 9 #include "NDefLib/Message.h"
giovannivisentini 0:04b82ae7aa43 10 #include "RecordType/EmptyRecord.h"
giovannivisentini 0:04b82ae7aa43 11 #include "RecordType/RecordText.h"
giovannivisentini 0:04b82ae7aa43 12
giovannivisentini 0:04b82ae7aa43 13 namespace NDefLib {
giovannivisentini 0:04b82ae7aa43 14
giovannivisentini 0:04b82ae7aa43 15 uint16_t Message::getByteLenght()const{
giovannivisentini 0:04b82ae7aa43 16 uint16_t lenght=2; //length size
giovannivisentini 0:04b82ae7aa43 17
giovannivisentini 0:04b82ae7aa43 18 if(mRecords.size()==0)
giovannivisentini 0:04b82ae7aa43 19 return lenght+EmptyRecord().getByteLenght();
giovannivisentini 0:04b82ae7aa43 20
giovannivisentini 0:04b82ae7aa43 21 std::vector<Record*>::const_iterator it = mRecords.begin();
giovannivisentini 0:04b82ae7aa43 22 const std::vector<Record*>::const_iterator end = mRecords.end();
giovannivisentini 0:04b82ae7aa43 23
giovannivisentini 0:04b82ae7aa43 24 for(;it!=end;++it){
giovannivisentini 0:04b82ae7aa43 25 lenght+= (*it)->getByteLenght();
giovannivisentini 0:04b82ae7aa43 26 }//for
giovannivisentini 0:04b82ae7aa43 27
giovannivisentini 0:04b82ae7aa43 28 return lenght;
giovannivisentini 0:04b82ae7aa43 29 }//getByteLenght
giovannivisentini 0:04b82ae7aa43 30
giovannivisentini 0:04b82ae7aa43 31 uint16_t Message::write(uint8_t *buffer){
giovannivisentini 0:04b82ae7aa43 32
giovannivisentini 0:04b82ae7aa43 33 const uint16_t length =getByteLenght()-2;
giovannivisentini 0:04b82ae7aa43 34 uint16_t offset=0;
giovannivisentini 0:04b82ae7aa43 35 buffer[offset++]=(uint8_t)((length & 0xFF00)>>8);
giovannivisentini 0:04b82ae7aa43 36 buffer[offset++]=(uint8_t)((length & 0x00FF));
giovannivisentini 0:04b82ae7aa43 37
giovannivisentini 0:04b82ae7aa43 38 const uint32_t nRecord = mRecords.size();
giovannivisentini 0:04b82ae7aa43 39
giovannivisentini 0:04b82ae7aa43 40 if(mRecords.size()==0){
giovannivisentini 0:04b82ae7aa43 41 offset += EmptyRecord().write(buffer+offset);
giovannivisentini 0:04b82ae7aa43 42 return offset;
giovannivisentini 0:04b82ae7aa43 43 }//else
giovannivisentini 0:04b82ae7aa43 44
giovannivisentini 0:04b82ae7aa43 45 for(uint32_t i=0;i<nRecord; i++){
giovannivisentini 0:04b82ae7aa43 46 Record *r = mRecords[i];
giovannivisentini 0:04b82ae7aa43 47
giovannivisentini 0:04b82ae7aa43 48 r->setAsMiddleRecord();
giovannivisentini 0:04b82ae7aa43 49 if(i==0)
giovannivisentini 0:04b82ae7aa43 50 r->setAsFirstRecord();
giovannivisentini 0:04b82ae7aa43 51 if(i==nRecord-1)
giovannivisentini 0:04b82ae7aa43 52 r->setAsLastRecord();
giovannivisentini 0:04b82ae7aa43 53
giovannivisentini 0:04b82ae7aa43 54 offset+= r->write(buffer+offset);
giovannivisentini 0:04b82ae7aa43 55 }//for
giovannivisentini 0:04b82ae7aa43 56
giovannivisentini 0:04b82ae7aa43 57 return offset;
giovannivisentini 0:04b82ae7aa43 58 }//write
giovannivisentini 0:04b82ae7aa43 59
giovannivisentini 0:04b82ae7aa43 60 void Message::parseMessage(uint8_t *rawNdefFile,std::vector<Record*> *parsedRecords){
giovannivisentini 0:04b82ae7aa43 61
giovannivisentini 0:04b82ae7aa43 62 //const uint16_t length = (rawNdefFile[0]<<8 | rawNdefFile[1]);
giovannivisentini 0:04b82ae7aa43 63 //skip the message length info
giovannivisentini 0:04b82ae7aa43 64 uint16_t offset=2;
giovannivisentini 0:04b82ae7aa43 65 Record *r;
giovannivisentini 0:04b82ae7aa43 66 do{
giovannivisentini 0:04b82ae7aa43 67 r = RecordText::parse(rawNdefFile+offset);
giovannivisentini 0:04b82ae7aa43 68 if(r==NULL){
giovannivisentini 0:04b82ae7aa43 69
giovannivisentini 0:04b82ae7aa43 70
giovannivisentini 0:04b82ae7aa43 71
giovannivisentini 0:04b82ae7aa43 72 }//else
giovannivisentini 0:04b82ae7aa43 73
giovannivisentini 0:04b82ae7aa43 74 offset += r->getByteLenght();
giovannivisentini 0:04b82ae7aa43 75 parsedRecords->push_back(r);
giovannivisentini 0:04b82ae7aa43 76 }while(!r->isLastRecord());
giovannivisentini 0:04b82ae7aa43 77
giovannivisentini 0:04b82ae7aa43 78 }
giovannivisentini 0:04b82ae7aa43 79
giovannivisentini 0:04b82ae7aa43 80
giovannivisentini 0:04b82ae7aa43 81 } /* namespace NDefLib */