initial commit

parsers/common/index.js

@@ -0,0 +1,27 @@
+const Parser = require('binary-parser').Parser;
+
+const PSN_PACKET_HEADER_PARSER = 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';
+    },
+  })
+  .uint64le('packet_timestamp')
+  .uint8('version_high')
+  .uint8('version_low')
+  .uint8('frame_id')
+  .uint8('frame_packet_count')
+  .seek(4);
+
+module.exports = {
+  PSN_PACKET_HEADER_PARSER,
+};