initial commit

2026-08-19 22:24:17 +00:00 · 2023-09-10 20:38:49 -05:00
commit 7a1366303f
16 changed files with 3268 additions and 0 deletions
@@ -0,0 +1,74 @@
+/* eslint-disable no-param-reassign */
+const { Parser } = require('binary-parser');
+const psnParser = require('./parsers/index.js');
+const { PSN_DATA_TRACKER_FIELD_PARSER } = require('./parsers/data/index.js');
+
+const DATA_PACKET = 0x6755;
+const INFO_PACKET = 0x6756;
+
+class Decoder {
+  constructor() {
+    this.info = {};
+
+    this.data = {
+      trackers: {},
+    };
+  }
+
+  // TODO(jwetzell): support multiple frame packets this might require some rework of how chunks are assumed
+  decode(packetBuf) {
+    const packet = psnParser(packetBuf);
+    if (packet.id === INFO_PACKET) {
+      if (packet.chunk_data?.tracker_list?.trackers) {
+        packet.chunk_data?.tracker_list?.trackers.forEach((tracker) => {
+          if (this.data.trackers[tracker.id] === undefined) {
+            this.data.trackers[tracker.id] = {};
+          }
+          this.data.trackers[tracker.id] = {
+            ...this.data.trackers[tracker.id],
+            id: tracker.id,
+            name: tracker.tracker_name.tracker_name,
+          };
+        });
+      }
+    } else if (packet.id === DATA_PACKET) {
+      if (packet.chunk_data?.tracker_list?.trackers) {
+        packet.chunk_data?.tracker_list?.trackers.forEach((tracker) => {
+          if (this.data.trackers[tracker.id] === undefined) {
+            this.data.trackers[tracker.id] = {};
+          }
+          this.data.trackers[tracker.id] = {
+            ...this.data.trackers[tracker.id],
+            id: tracker.id,
+          };
+
+          if (tracker.data && tracker.data_len > 0) {
+            const fields = new Parser()
+              .array('fields', {
+                type: PSN_DATA_TRACKER_FIELD_PARSER,
+                lengthInBytes: tracker.data_len,
+              })
+              .parse(tracker.data);
+            if (fields.fields) {
+              fields.fields.forEach((field) => {
+                if (field.data) {
+                  this.data.trackers[tracker.id] = {
+                    ...this.data.trackers[tracker.id],
+                    ...field.data,
+                  };
+                }
+              });
+            }
+            tracker.fields = fields.fields;
+            delete tracker.data;
+          }
+        });
+      }
+    }
+    return packet;
+  }
+}
+
+module.exports = {
+  Decoder,
+};