convert to typescript

src/decoders/info/info-tracker-chunk.ts

@@ -0,0 +1,30 @@
+import { Constants } from '../../constants';
+import chunk, { Chunk } from '../chunk';
+import infoTrackerNameChunk, { InfoTrackerNameChunk } from './info-tracker-name-chunk';
+
+export interface InfoTrackerChunk extends Chunk {
+  tracker_name?: InfoTrackerNameChunk;
+}
+
+function decodeInfoTrackerChunk(infoTrackerChunk: InfoTrackerChunk) {
+  if (infoTrackerChunk.has_subchunks && infoTrackerChunk.chunk_data && infoTrackerChunk.data_len) {
+    let offset = 0;
+    while (offset < infoTrackerChunk.data_len) {
+      const chunkId = infoTrackerChunk.chunk_data.readUInt16LE(offset);
+      switch (chunkId) {
+        case 0x0000:
+          infoTrackerChunk.tracker_name = infoTrackerNameChunk(infoTrackerChunk.chunk_data.subarray(offset));
+          offset += Constants.CHUNK_HEADER_SIZE;
+          if (infoTrackerChunk.tracker_name?.data_len) {
+            offset += infoTrackerChunk?.tracker_name?.data_len;
+          }
+          break;
+
+        default:
+          break;
+      }
+    }
+  }
+}
+
+export default (buffer: Buffer): InfoTrackerChunk => chunk(buffer, decodeInfoTrackerChunk);