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Refactor variable declarations from var to let for improved scope man…
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…agement in ntag215.js
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@DanTheMan827
DanTheMan827 committed Jan 25, 2025
1 parent 620a409 commit 7594497
Showing 1 changed file with 78 additions and 77 deletions.
155 changes: 78 additions & 77 deletions ntag215.js
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Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,7 @@ const COMMAND_BLE_PACKET_TEST = 0x00;
*
* If the slot is specified, returns one byte indicating the command, the slot number used, and then 80 bytes of data made from the following code:
* ```javascript
* var output = Uint8Array(80);
* let output = Uint8Array(80);
* output.set(tags[slot].buffer.slice(0, 8), 0);
* output.set(tags[slot].buffer.slice(16, 24), 8);
* output.set(tags[slot].buffer.slice(32, 52), 20);
Expand Down Expand Up @@ -233,37 +233,37 @@ const ENABLE_LEDS = ENABLE_LED1 || ENABLE_LED2 || ENABLE_LED3;
/**
* The active tag index.
*/
var currentTag = 0;
let currentTag = 0;

/**
* Contains the timeout between changing tags.
*/
var changeTagTimeout = null;
let changeTagTimeout = null;

/**
* A buffer used by the NTAG215 emulator.
*/
var txBuffer = new Uint8Array(32);
let txBuffer = new Uint8Array(32);

/**
* An array of the in-memory tags, unused if {@link SAVE_TO_FLASH} is true
*/
var tags = [];
let tags = [];

/**
* If {@link fastRx} should process data.
*/
var rxPaused = false;
let rxPaused = false;

/**
* Auto-sleep timeout reference.
*/
var autoSleepTimeout = null;
let autoSleepTimeout = null;

/**
* If bluetooth is currently connected.
*/
var bluetoothConnected = false;
let bluetoothConnected = false;
// #endregion

// #region Tag initialization
Expand Down Expand Up @@ -321,7 +321,7 @@ function fixUid() {
*/
function hexDump(inputData) {
// Initialize an empty string `line`, which will be used to build the output lines containing the hexadecimal values.
var line = "";
let line = "";

// Iterate through each element of the `inputData` array.
for (let i = 0; i < inputData.length; i++) {
Expand Down Expand Up @@ -360,23 +360,23 @@ function hexDump(inputData) {
* @returns {Uint8Array} A 9-byte Uint8Array containing the generated UID.
*/
function generateUid() {
var uid = new Uint8Array(9);
let uid = new Uint8Array(9);

// Set the first byte as 0x04
uid[0] = 0x04;

// Set the next two bytes as random values between 0 and 255
uid[1] = Math.round(Math.random() * 255);
uid[2] = Math.round(Math.random() * 255);
uid[1] = _MathRound(_MathRandom() * 255);
uid[2] = _MathRound(_MathRandom() * 255);

// Set the fourth byte using XOR operation with specific values
uid[3] = uid[0] ^ uid[1] ^ uid[2] ^ 0x88;

// Set the next four bytes as random values between 0 and 255
uid[4] = Math.round(Math.random() * 255);
uid[5] = Math.round(Math.random() * 255);
uid[6] = Math.round(Math.random() * 255);
uid[7] = Math.round(Math.random() * 255);
uid[4] = _MathRound(_MathRandom() * 255);
uid[5] = _MathRound(_MathRandom() * 255);
uid[6] = _MathRound(_MathRandom() * 255);
uid[7] = _MathRound(_MathRandom() * 255);

// Set the last byte using XOR operation with specific values
uid[8] = uid[4] ^ uid[5] ^ uid[6] ^ uid[7];
Expand All @@ -389,7 +389,7 @@ function generateUid() {
* @returns {Uint8Array} - The generated tag.
*/
function generateBlankTag() {
var tag = new Uint8Array(572);
let tag = new Uint8Array(572);

// Generate blank NTAG215 tags with random, but valid UID.
tag.set(generateUid(), 0);
Expand Down Expand Up @@ -518,7 +518,7 @@ function cycleTags() {
*/
function getBufferClone(buffer) {
if (buffer) {
var output = new Uint8Array(buffer.length);
let output = new Uint8Array(buffer.length);
output.set(buffer);

return output;
Expand Down Expand Up @@ -549,7 +549,7 @@ function saveTag(slot) {
* Saves all tags to flash.
*/
function saveAllTags() {
for (var i = 0; i < tags.length; i++) {
for (let i = 0; i < tags.length; i++) {
saveTag(i);
}
}
Expand Down Expand Up @@ -769,15 +769,15 @@ function onFastModeDisconnect() {
function rxBytes(count, callback) {
rxPaused = true;

var buffer = new Uint8Array(count);
var position = 0;
let buffer = new Uint8Array(count);
let position = 0;

function receive(data) {
buffer.set(new Uint8Array(E.toUint8Array(data), 0, Math.min(data.length, count - position)), position);
position = position + data.length;

if (position >= count) {
var tempBuffer = buffer;
let tempBuffer = buffer;
disconnect();
callback(tempBuffer);
}
Expand Down Expand Up @@ -808,40 +808,27 @@ function fastRx(data) {
// data is a string, so you want to convert to an array to work with
data = E.toUint8Array(data);

// define some variables to use.
var slot,
startIdx,
dataSize,
sourceData,
oldSlot,
newSlot,
response,
nullIdx,
crc32,
tag,
count,
i;

if (data.length > 0) {
switch (data[0]) {
case COMMAND_BLE_PACKET_TEST: //BLE Packet Test
case COMMAND_BLE_PACKET_TEST: { //BLE Packet Test
_Bluetooth.write(new Uint8Array(data.length > 1 ? data[1] : 255));

return;
}

case COMMAND_SLOT_INFORMATION: //Slot Information <Slot>
case COMMAND_SLOT_INFORMATION: { //Slot Information <Slot>
if (data.length > 1) {
count = data.length > 2 ? data[2] : 1;
let count = data.length > 2 ? data[2] : 1;

//Returns a subset of data for identifying
slot = data[1] < tags.length ? data[1] : currentTag;
let slot = data[1] < tags.length ? data[1] : currentTag;

if (slot + count > tags.length) {
count = tags.length - slot;
}

for (i = slot; i < (slot + count); i++) {
var tagData = getTagInfo(i);
for (let i = slot; i < (slot + count); i++) {
let tagData = getTagInfo(i);

_Bluetooth.write([COMMAND_SLOT_INFORMATION, i]);
_Bluetooth.write(tagData);
Expand All @@ -852,32 +839,34 @@ function fastRx(data) {
}

return;
}

case COMMAND_READ: //Read <Slot> <StartPage> <PageCount>
case COMMAND_READ: { //Read <Slot> <StartPage> <PageCount>
//Max pages: 143
//Returns 0x02 <Slot> <StartPage> <PageCount> <Data>
startIdx = data[2] * 4;
dataSize = data[3] * 4;
slot = data[1] < tags.length ? data[1] : currentTag;
sourceData = getTag(slot).slice(startIdx, startIdx + dataSize);
let startIdx = data[2] * 4;
let dataSize = data[3] * 4;
let slot = data[1] < tags.length ? data[1] : currentTag;
let sourceData = getTag(slot).slice(startIdx, startIdx + dataSize);

if (ENABLE_LOG) {
//_consoleLog("Reading from slot: " + slot);
//_consoleLog("Read from " + startIdx + " - " + (startIdx + dataSize));
}

response = Uint8Array(4);
let response = Uint8Array(4);
response.set(Uint8Array(data, 0, 4), 0);
response[1] = slot;
_Bluetooth.write(response);
_Bluetooth.write(sourceData);

return;
}

case COMMAND_WRITE: //Write <Slot> <StartPage> <Data>
startIdx = data[2] * 4;
dataSize = data.length - 3;
slot = data[1] < tags.length ? data[1] : currentTag;
case COMMAND_WRITE: { //Write <Slot> <StartPage> <Data>
let startIdx = data[2] * 4;
let dataSize = data.length - 3;
let slot = data[1] < tags.length ? data[1] : currentTag;

//store data if it fits into memory
if ((startIdx + dataSize) <= 572) {
Expand All @@ -893,21 +882,23 @@ function fastRx(data) {
_Bluetooth.write([COMMAND_WRITE, slot, data[2]]);

return;
}

case COMMAND_SAVE: //Save <Slot>
case COMMAND_SAVE: { //Save <Slot>
if (SAVE_TO_FLASH) {
slot = data[1] < tags.length ? data[1] : currentTag;
let slot = data[1] < tags.length ? data[1] : currentTag;

saveTag(slot);
}

_Bluetooth.write([COMMAND_SAVE, data[1]]);

return;
}

case COMMAND_FULL_WRITE: //Full Write <Slot>
slot = data[1];
crc32 = null;
case COMMAND_FULL_WRITE: { //Full Write <Slot>
let slot = data[1];
let crc32 = null;

if (data.length == 6) {
crc32 = data.slice(2, 6);
Expand Down Expand Up @@ -935,29 +926,31 @@ function fastRx(data) {
}, 0);

return;
}

case COMMAND_FULL_READ: //Full Read <Slot> <Count>
count = data.length > 2 ? data[2] : 1;
case COMMAND_FULL_READ: { //Full Read <Slot> <Count>
let count = data.length > 2 ? data[2] : 1;

//Returns a subset of data for identifying
slot = data[1] < tags.length ? data[1] : currentTag;
let slot = data[1] < tags.length ? data[1] : currentTag;

if (slot + count > tags.length) {
count = tags.length - slot;
}

for (i = slot; i < (slot + count); i++) {
tag = getTag(i);
crc32 = getCRC32(tag);
for (let i = slot; i < (slot + count); i++) {
let tag = getTag(i);
let crc32 = getCRC32(tag);
_Bluetooth.write([COMMAND_FULL_READ, i, crc32[0], crc32[1], crc32[2], crc32[3]]);
_Bluetooth.write(tag);
}

return;
}

case COMMAND_CLEAR_SLOT: //Clear Slot <Slot>
slot = data[1];
tag = generateBlankTag();
case COMMAND_CLEAR_SLOT: { //Clear Slot <Slot>
let slot = data[1];
let tag = generateBlankTag();
getTag(slot).set(tag);

refreshTag(slot);
Expand All @@ -969,17 +962,19 @@ function fastRx(data) {
_Bluetooth.write([COMMAND_CLEAR_SLOT, slot, tag[0], tag[1], tag[2], tag[3], tag[4], tag[5], tag[6], tag[7], tag[8]]);

return;
}

case COMMAND_GET_BLUETOOTH_NAME: //Get Bluetooth Name
case COMMAND_GET_BLUETOOTH_NAME: { //Get Bluetooth Name
//Returns the bluetooth name, followed by a null terminator.
_Bluetooth.write(storage.readArrayBuffer(PUCK_NAME_FILE));
_Bluetooth.write([0]); // Null terminator

return;
}

case COMMAND_SET_BLUETOOTH_NAME: //Set Bluetooth Name
case COMMAND_SET_BLUETOOTH_NAME: { //Set Bluetooth Name
// Get the index of the null terminator.
nullIdx = data.indexOf(0);
let nullIdx = data.indexOf(0);

// If the null terminator is not found, set it to the end of the data.
if (nullIdx == -1) {
Expand All @@ -1001,8 +996,9 @@ function fastRx(data) {
_Bluetooth.write(data);

return;
}

case COMMAND_GET_FIRMWARE: //Get Firmware
case COMMAND_GET_FIRMWARE: { //Get Firmware
if (ENABLE_LOG) {
_consoleLog("Firmware Name:", FIRMWARE_NAME);
}
Expand All @@ -1011,10 +1007,12 @@ function fastRx(data) {
_Bluetooth.write([0]); // Null terminator

return;
}

case COMMAND_MOVE_SLOT: { //Move slot <From> <To>
let oldSlot = data[1];
let newSlot = data[2];

case COMMAND_MOVE_SLOT: //Move slot <From> <To>
oldSlot = data[1];
newSlot = data[2];
if (oldSlot < tags.length && newSlot < tags.length) {
tags.splice(newSlot, 0, tags.splice(oldSlot, 1)[0]);
changeTag(currentTag);
Expand All @@ -1023,15 +1021,17 @@ function fastRx(data) {
_Bluetooth.write([COMMAND_MOVE_SLOT, oldSlot, newSlot]);

return;
}

case COMMAND_ENABLE_BLE_UART: //Enable BLE UART
case COMMAND_ENABLE_BLE_UART: { //Enable BLE UART
onFastModeDisconnect();

return;
}

case COMMAND_RESTART_NFC: //Restart NFC <Slot?>
case COMMAND_RESTART_NFC: { //Restart NFC <Slot?>
if (data.length > 1) {
slot = data[1] >= tags.length ? 0 : data[1];
let slot = data[1] >= tags.length ? 0 : data[1];
changeTag(slot);
_Bluetooth.write([COMMAND_RESTART_NFC, slot]);
} else {
Expand All @@ -1040,6 +1040,7 @@ function fastRx(data) {
}

return;
}

default:
_Bluetooth.write("Bad Command");
Expand Down Expand Up @@ -1130,7 +1131,7 @@ if (typeof _NTAG215 !== "undefined") {
});

// Initialize the tags in ram, and load any saved tags from flash.
for (var i = 0; i < tags.length; i++) {
for (let i = 0; i < tags.length; i++) {
const filename = "tag" + i + ".bin";
const buffer = storage.readArrayBuffer(filename);
const tag = getTag(i);
Expand Down

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