ENCODING!! and lots of organization

decoders/data/data-tracker-list-chunk.js

@@ -0,0 +1,22 @@
+const Parser = require('binary-parser').Parser;
+
+const dataTrackerParser = new Parser()
+  .uint16le('id')
+  .uint16le('data_len', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return Number.parseInt(binary.substring(1), 2);
+    },
+  })
+  .seek(-2)
+  .uint16le('has_subchunks', {
+    formatter: (item) => {
+      const binary = item.toString(2).padStart(16, '0');
+      return binary.charAt(0) === '1';
+    },
+  })
+  .buffer('data', {
+    length: 'data_len',
+  });
+
+module.exports = new Parser().array('trackers', { type: dataTrackerParser, readUntil: 'eof' });