organization

src/encoders/chunk.js

@@ -0,0 +1,13 @@
+module.exports = (id, chunkData, hasSubchunks) => {
+  if (chunkData.length > 0x7fff) {
+    throw new Error('chunkData can not be greater than 32767 bytes');
+  }
+
+  const header = Buffer.alloc(4);
+  header.writeUInt16LE(id);
+  const chunkLengthBinaryString = chunkData.length.toString(2).padStart(15, '0');
+  const secondByteBinary = `${hasSubchunks ? '1' : '0'}${chunkLengthBinaryString}`;
+  header.writeUInt16LE(parseInt(secondByteBinary, 2), 2);
+
+  return Buffer.concat([header, chunkData]);
+};

src/encoders/data/data-chunk.js

@@ -0,0 +1,4 @@
+const chunk = require('../chunk');
+
+module.exports = (packetHeaderChunk, trackerListChunk) =>
+  chunk(0x6755, Buffer.concat([packetHeaderChunk, trackerListChunk]), true);

src/encoders/data/data-tracker-accel-chunk.js

@@ -0,0 +1,9 @@
+const chunk = require('../chunk');
+
+module.exports = (x, y, z) => {
+  const buf = Buffer.alloc(12);
+  buf.writeFloatLE(x);
+  buf.writeFloatLE(y, 4);
+  buf.writeFloatLE(z, 8);
+  return chunk(0x0004, buf, false);
+};

src/encoders/data/data-tracker-chunk.js

@@ -0,0 +1,3 @@
+const chunk = require('../chunk');
+
+module.exports = (trackerId, fieldChunks) => chunk(trackerId, Buffer.concat(fieldChunks), true);

src/encoders/data/data-tracker-list-chunk.js

@@ -0,0 +1,3 @@
+const chunk = require('../chunk');
+
+module.exports = (trackerChunks) => chunk(0x0001, Buffer.concat(trackerChunks), true);

src/encoders/data/data-tracker-ori-chunk.js

@@ -0,0 +1,9 @@
+const chunk = require('../chunk');
+
+module.exports = (x, y, z) => {
+  const buf = Buffer.alloc(12);
+  buf.writeFloatLE(x);
+  buf.writeFloatLE(y, 4);
+  buf.writeFloatLE(z, 8);
+  return chunk(0x0002, buf, false);
+};

src/encoders/data/data-tracker-pos-chunk.js

@@ -0,0 +1,9 @@
+const chunk = require('../chunk');
+
+module.exports = (x, y, z) => {
+  const buf = Buffer.alloc(12);
+  buf.writeFloatLE(x);
+  buf.writeFloatLE(y, 4);
+  buf.writeFloatLE(z, 8);
+  return chunk(0x0000, buf, false);
+};

src/encoders/data/data-tracker-speed-chunk.js

@@ -0,0 +1,9 @@
+const chunk = require('../chunk');
+
+module.exports = (x, y, z) => {
+  const buf = Buffer.alloc(12);
+  buf.writeFloatLE(x);
+  buf.writeFloatLE(y, 4);
+  buf.writeFloatLE(z, 8);
+  return chunk(0x0001, buf, false);
+};

src/encoders/data/data-tracker-status-chunk.js

@@ -0,0 +1,7 @@
+const chunk = require('../chunk');
+
+module.exports = (validity) => {
+  const buf = Buffer.alloc(4);
+  buf.writeFloatLE(validity);
+  return chunk(0x0003, buf, false);
+};

src/encoders/data/data-tracker-timestamp-chunk.js

@@ -0,0 +1,10 @@
+const chunk = require('../chunk');
+
+module.exports = (timestamp) => {
+  const buf = Buffer.alloc(8);
+  const timestampHigh = timestamp.toString(2).padStart(64, '0').substring(0, 32);
+  const timestampLow = timestamp.toString(2).padStart(64, '0').substring(32);
+  buf.writeUInt32LE(parseInt(timestampLow, 2));
+  buf.writeUInt32LE(parseInt(timestampHigh, 2), 4);
+  return chunk(0x0006, buf, false);
+};

src/encoders/data/data-tracker-trgtpos-chunk.js

@@ -0,0 +1,9 @@
+const chunk = require('../chunk');
+
+module.exports = (x, y, z) => {
+  const buf = Buffer.alloc(12);
+  buf.writeFloatLE(x);
+  buf.writeFloatLE(y, 4);
+  buf.writeFloatLE(z, 8);
+  return chunk(0x0005, buf, false);
+};

src/encoders/info/info-chunk.js

@@ -0,0 +1,4 @@
+const chunk = require('../chunk');
+
+module.exports = (packetHeaderChunk, systemNameChunk, trackerListChunk) =>
+  chunk(0x6756, Buffer.concat([packetHeaderChunk, systemNameChunk, trackerListChunk]), true);

src/encoders/info/info-system-name-chunk.js

@@ -0,0 +1,3 @@
+const chunk = require('../chunk');
+
+module.exports = (systemName) => chunk(0x0001, Buffer.from(systemName), false);

src/encoders/info/info-tracker-chunk.js

@@ -0,0 +1,3 @@
+const chunk = require('../chunk');
+
+module.exports = (trackerId, trackerNameChunk) => chunk(trackerId, trackerNameChunk, true);

src/encoders/info/info-tracker-list-chunk.js

@@ -0,0 +1,3 @@
+const chunk = require('../chunk');
+
+module.exports = (trackerChunks) => chunk(0x0002, Buffer.concat(trackerChunks), true);

src/encoders/info/info-tracker-name-chunk.js

@@ -0,0 +1,3 @@
+const chunk = require('../chunk');
+
+module.exports = (trackerName) => chunk(0x0000, Buffer.from(trackerName), false);

src/encoders/packet-header-chunk.js

@@ -0,0 +1,15 @@
+const chunk = require('./chunk');
+
+module.exports = (timestamp, versionHigh, versionLow, frameId, framePacketCount) => {
+  const packetHeader = Buffer.alloc(12);
+  const timestampHigh = timestamp.toString(2).padStart(64, '0').substring(0, 32);
+  const timestampLow = timestamp.toString(2).padStart(64, '0').substring(32);
+  packetHeader.writeUInt32LE(parseInt(timestampLow, 2));
+  packetHeader.writeUInt32LE(parseInt(timestampHigh, 2), 4);
+  packetHeader.writeUint8(versionHigh, 8);
+  packetHeader.writeUint8(versionLow, 9);
+  packetHeader.writeUint8(frameId, 10);
+  packetHeader.writeUint8(framePacketCount, 11);
+
+  return chunk(0x0000, packetHeader, false);
+};