packages/dubbo/src/byte.ts

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// Merge pull request #27 from hsiaosiyuan0/master
// 3ks hsiaosiyuan0

export const toBytes4 = (num: number) => {
  const buf = Buffer.allocUnsafe(4);
  buf.writeUInt32BE(num, 0);
  return buf;
};

export const fromBytes4 = (buf: Buffer) => {
  return buf.readUInt32BE(0);
};

export const toBytes8 = (num: number) => {
  const buf = Buffer.allocUnsafe(8);
  //2 ** 32 = 4294967296
  const high = Math.floor(num / 4294967296);
  const low = (num & 0xffffffff) >>> 0;
  buf.writeUInt32BE(high, 0);
  buf.writeUInt32BE(low, 4);
  return buf;
};

export const fromBytes8 = (buf: Buffer) => {
  const high = buf.readUInt32BE(0);
  const low = buf.readUInt32BE(4);
  //Math.pow(2, 32) = 4294967296
  return high * 4294967296 + low;
};