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Add a listApps feature and test before read data #35

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Add a listApps feature and test before read data #35

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37 changes: 34 additions & 3 deletions examples/desfire.js
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Original file line number Diff line number Diff line change
Expand Up @@ -147,14 +147,39 @@ nfc.on('reader', async reader => {

};

const listApps = async () => {
const res = await reader.transmit(Buffer.from([0x90, 0x6a, 0x00, 0x00, 0x00]), 32);

if (res.slice(-1)[0] !== 0x00) {
throw new Error('error in step 3 - list apps');
}

// empty card
if (res.length < 3) {
pretty.info(`no apps found`);
return [];
}

const resApps = res.slice(0, res.length - res.length % 3);
let i = 0;
let apps = [];

for (i = 0; i < resApps.length; i++) {
apps.push(resApps.slice(i ,i + 3));
i += 2
}
pretty.info(`apps found`, apps);
return apps;
}

const readData = async () => {

// 3: [0xBD] ReadData(FileNo,Offset,Length) [8bytes] - Reads data from Standard Data Files or Backup Data Files
const res = await send(wrap(0xbd, [desfire.read.fileId, ...desfire.read.offset, ...desfire.read.length]), 'step 3 - read', 255);

// something went wrong
if (res.slice(-1)[0] !== 0x00) {
throw new Error('error in step 3 - read');
throw new Error('error in step 4 - read');
}

console.log('data', res);
Expand All @@ -172,7 +197,13 @@ nfc.on('reader', async reader => {
await authenticate(key);

// step 3
await readData();
const apps = await listApps();

if (apps.length > 0) {
// step 4
await readData();
}



} catch (err) {
Expand Down