initial commit

src/encoders/index.ts

@@ -0,0 +1,5 @@
+import RTTrPHeader from './rttrp';
+
+export const Encoders = {
+  RTTrPHeader,
+};

src/encoders/rttrp.ts

@@ -0,0 +1,37 @@
+import { RTTrPHeader } from '../models';
+
+export default (header: RTTrPHeader): Uint8Array => {
+  if (header.version !== 2) {
+    throw new Error('Only version 2 of the RTTrP header is currently supported');
+  }
+  const bytes = new Uint8Array(18 + header.data.length);
+  bytes.set(header.data, 18);
+
+  const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
+  let dataOffset = 0;
+
+  let isLittleEndian = false;
+  view.setUint16(dataOffset, header.intHeader, isLittleEndian);
+  dataOffset += 2;
+  view.setUint16(dataOffset, header.fltHeader, isLittleEndian);
+  dataOffset += 2;
+  if (header.intHeader === 0x4154) {
+    isLittleEndian = false;
+  }
+  view.setUint16(dataOffset, header.version, isLittleEndian);
+  dataOffset += 2;
+
+  view.setUint32(dataOffset, header.pID, isLittleEndian);
+  dataOffset += 4;
+
+  view.setUint8(dataOffset, header.pForm);
+  dataOffset += 1;
+  view.setUint16(dataOffset, header.pktSize, isLittleEndian);
+  dataOffset += 2;
+  view.setUint32(dataOffset, header.context, isLittleEndian);
+  dataOffset += 4;
+  view.setUint8(dataOffset, header.numMods);
+  dataOffset += 1;
+
+  return bytes;
+};