completely rework the parsing structure because I now realize how frames work

2026-08-17 05:13:39 +00:00 · 2023-09-10 23:40:06 -05:00
parent 7a1366303f
commit 17224d9319
9 changed files with 261 additions and 132 deletions
@@ -0,0 +1,70 @@
+/* eslint-disable no-case-declarations */
+/* eslint-disable no-param-reassign */
+const { Parser } = require('binary-parser');
+const { ChunkParser, HeaderParser } = require('../parsers/common');
+const { DataTrackerListParser, DataTrackerFieldParser } = require('../parsers/data');
+
+class DataPacket {
+  constructor(packet) {
+    this.packet = packet;
+    this.subChunks = [];
+    if (this.packet.has_subchunks) {
+      this.subChunkParser = new Parser().array('chunks', {
+        type: ChunkParser,
+        lengthInBytes: this.packet.data_len,
+      });
+      this.subChunks = this.subChunkParser.parse(this.packet.chunk_data)?.chunks;
+      this.subChunks = this.subChunks.map((subChunk) => {
+        let populatedSubChunk = {};
+        populatedSubChunk.data_len_valid = subChunk.chunk_data.length === subChunk.data_len;
+        switch (subChunk.id) {
+          case 0:
+            populatedSubChunk = {
+              ...subChunk,
+              ...HeaderParser.parse(subChunk.chunk_data),
+            };
+            break;
+          case 1:
+            const dataTrackerList = DataTrackerListParser.parse(subChunk.chunk_data);
+            dataTrackerList.trackers?.forEach((tracker) => {
+              if (tracker.data && tracker.data_len > 0) {
+                const fields = new Parser()
+                  .array('fields', {
+                    type: DataTrackerFieldParser,
+                    lengthInBytes: tracker.data_len,
+                  })
+                  .parse(tracker.data);
+                if (fields.fields) {
+                  tracker.fields = [];
+                  fields.fields.forEach((field) => {
+                    tracker.fields.push(field.data);
+                  });
+                }
+              }
+            });
+            populatedSubChunk = {
+              ...subChunk,
+              ...dataTrackerList,
+            };
+            break;
+          default:
+            populatedSubChunk = {
+              ...subChunk,
+            };
+            break;
+        }
+        return populatedSubChunk;
+      });
+    }
+  }
+
+  getHeaderPacket() {
+    return this.subChunks.find((subChunk) => subChunk.id === 0x0000);
+  }
+
+  getSystemPacket() {
+    return this.subChunks.find((subChunk) => subChunk.id === 0x0001);
+  }
+}
+
+module.exports = DataPacket;