Add binary encoder

Author: lxsmnsyc

packages/seroval/src/binary/encoder.ts

@@ -0,0 +1,52 @@
+function getSize(bytes: (number | Uint8Array)[]): number {
+  let size = 0;
+  for (let i = 0, len = bytes.length; i < len; i++) {
+    const current = bytes[i];
+    if (typeof current === 'number') {
+      size++;
+    } else {
+      size += current.length;
+    }
+  }
+  return size;
+}
+
+export function mergeBytes(bytes: (number | Uint8Array)[]) {
+  const newArr = new Uint8Array(getSize(bytes));
+
+  let index = 0;
+
+  for (let i = 0, len = bytes.length; i < len; i++) {
+    const current = bytes[i];
+    if (typeof current === 'number') {
+      newArr[index++] = current;
+    } else {
+      const size = current.length;
+      newArr.set(current, index);
+      index += size;
+    }
+  }
+
+  return newArr;
+}
+
+export function encodeInteger(value: number): Uint8Array {
+  const arr = new Uint8Array(4);
+  arr[0] = (value & 0xff000000) >> 24;
+  arr[1] = (value & 0x00ff0000) >> 16;
+  arr[2] = (value & 0x0000ff00) >> 8;
+  arr[3] = value & 0x000000ff;
+  return arr;
+}
+
+export function encodeNumber(value: number): Uint8Array {
+  const buffer = new ArrayBuffer(8);
+  const float = new Float64Array(buffer);
+  float[0] = value;
+  return new Uint8Array(buffer);
+}
+
+export function encodeString(value: string): Uint8Array {
+  const encoder = new TextEncoder();
+  return encoder.encode(value);
+}