119 lines
2.6 KiB
JavaScript
119 lines
2.6 KiB
JavaScript
/**
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* 十六进制工具函数
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*/
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/**
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* ArrayBuffer 转十六进制字符串
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* @param {ArrayBuffer} buffer - ArrayBuffer 数据
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* @returns {string} 十六进制字符串（大写）
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*/
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function arrayBufferToHex(buffer) {
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const hexArr = Array.prototype.map.call(
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new Uint8Array(buffer),
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function (byte) {
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return ('0' + byte.toString(16)).slice(-2);
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}
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);
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return hexArr.join('').toUpperCase();
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}
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/**
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* 十六进制字符串转 ArrayBuffer
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* @param {string} hex - 十六进制字符串
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* @returns {ArrayBuffer} ArrayBuffer 数据
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*/
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function hexToArrayBuffer(hex) {
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// 去除空格和换行
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hex = hex.replace(/\s+/g, '');
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// 确保长度为偶数
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if (hex.length % 2 !== 0) {
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hex = '0' + hex;
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}
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const length = hex.length / 2;
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const buffer = new ArrayBuffer(length);
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const dataView = new DataView(buffer);
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for (let i = 0; i < length; i++) {
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const byte = parseInt(hex.substr(i * 2, 2), 16);
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dataView.setUint8(i, byte);
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}
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return buffer;
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}
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/**
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* 十六进制字符串转字节数组
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* @param {string} hex - 十六进制字符串
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* @returns {Array<number>} 字节数组
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*/
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function hexToBytes(hex) {
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hex = hex.replace(/\s+/g, '');
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const bytes = [];
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for (let i = 0; i < hex.length; i += 2) {
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bytes.push(parseInt(hex.substr(i, 2), 16));
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}
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return bytes;
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}
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/**
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* 字节数组转十六进制字符串
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* @param {Array<number>} bytes - 字节数组
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* @returns {string} 十六进制字符串
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*/
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function bytesToHex(bytes) {
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return bytes
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.map(b => ('0' + b.toString(16)).slice(-2))
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.join('')
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.toUpperCase();
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}
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/**
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* CRC16 校验（Modbus RTU）
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* @param {string} hex - 十六进制字符串（不含 CRC）
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* @returns {string} CRC16 校验码（4位十六进制）
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*/
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function crc16(hex) {
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const bytes = hexToBytes(hex);
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let crc = 0xFFFF;
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for (let i = 0; i < bytes.length; i++) {
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crc ^= bytes[i];
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for (let j = 0; j < 8; j++) {
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if (crc & 0x0001) {
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crc = (crc >> 1) ^ 0xA001;
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} else {
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crc = crc >> 1;
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}
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}
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}
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// 返回低位在前，高位在后
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const low = (crc & 0xFF).toString(16).padStart(2, '0');
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const high = ((crc >> 8) & 0xFF).toString(16).padStart(2, '0');
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return (low + high).toUpperCase();
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}
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/**
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* 验证 CRC16 校验码
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* @param {string} hex - 完整的十六进制字符串（含 CRC）
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* @returns {boolean} 校验是否通过
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*/
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function verifyCrc16(hex) {
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if (hex.length < 4) return false;
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const data = hex.slice(0, -4);
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const crc = hex.slice(-4);
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return crc16(data) === crc;
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}
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module.exports = {
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arrayBufferToHex,
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hexToArrayBuffer,
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hexToBytes,
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bytesToHex,
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crc16,
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verifyCrc16,
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}; |