1 files changed, 37 insertions, 0 deletions
diff --git a/src/packets/utils.ts b/src/packets/utils.ts
new file mode 100644
index 0000000..3a5befc
--- /dev/null
+++ b/src/packets/utils.ts
@@ -0,0 +1,37 @@
+import { packetName } from "../constants";
+import { minUInt, writeUintN, writeUint8 } from "../utils";
+
+export interface TASDPacket {
+  key: number;
+  size: number;
+  toBuffer(g_keylen: number): Uint8Array;
+  toString(): string;
+}
+
+export function buildBuffer(g_keylen: number, key: number, payload: Uint8Array) {
+  const plen = payload.length;
+  const pexp = minUInt(plen);
+  const buffer = new Uint8Array(g_keylen + 1 + pexp + plen);
+  let index = 0;
+  writeUintN(key, buffer, index, g_keylen);
+  index += g_keylen;
+  writeUint8(pexp, buffer, index);
+  index += 1;
+  writeUintN(plen, buffer, index, pexp);
+  index += pexp;
+  buffer.set(payload, index);
+  return buffer;
+}
+
+export class UnknownPacket implements TASDPacket {
+  constructor(public key: number, public payload: Uint8Array) {}
+  get size() {
+    return this.payload.length;
+  }
+  toBuffer(g_keylen: number) {
+    return buildBuffer(g_keylen, this.key, this.payload);
+  }
+  toString() {
+    return `UnknownPacket ${packetName(this.key)}, ${this.size}`;
+  }
+}
+\ No newline at end of file