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From: =?UTF-8?q?=E2=80=9CDaisyWu=E2=80=9D?= <“18682150237@163.com”>
Date: Wed, 4 Dec 2024 17:24:16 +0800
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---
 lib/main.dart | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/lib/main.dart b/lib/main.dart
index d4898717..b6c301cc 100755
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -2,6 +2,9 @@ import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:crc/crc.dart';
+import 'package:crclib/catalog.dart';
+import 'package:crypto/crypto.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_bugly/flutter_bugly.dart';
@@ -105,3 +108,54 @@ void findChineseCharacters(Directory directory) {
 bool hasChineseCharacters(String input) {
   return RegExp(r'[\u4e00-\u9fa5]').hasMatch(input);
 }
+
+
+//ToDo: 挪到可用位置这里可删掉
+/** 
+ * 计算 CRC16 校验值
+void calculateCrc16() {
+  const String payload = 'hello';
+
+  // 将字符串转换为 Uint8List
+  final Uint8List uint8Payload = stringToUint8List(payload);
+
+  // 使用自定义 CRC32 算法
+  final int crc32Value = crc32Uint16(uint8Payload);
+
+  print('************ input 为 "$payload" 的 CRC32 值为 $crc32Value');
+}
+
+// 将字符串转换为 Uint8List
+Uint8List stringToUint8List(String input) {
+  return Uint8List.fromList(utf8.encode(input));
+}
+
+// 自定义 CRC32 实现
+int crc32Uint16(Uint8List data) {
+  const int polynomial = 0xD5828281;
+
+  // 创建 CRC32 表
+  final List<int> table = List<int>.generate(256, (i) {
+    int crc = i;
+    for (int j = 0; j < 8; j++) {
+      if ((crc & 1) != 0) {
+        crc = (crc >> 1) ^ polynomial;
+      } else {
+        crc >>= 1;
+      }
+    }
+    return crc;
+  });
+
+  // 计算 CRC32 校验值
+  int crc = 0xFFFFFFFF;
+  for (final int byte in data) {
+    crc = (crc >> 8) ^ table[(crc ^ byte) & 0xFF];
+  }
+
+  crc ^= 0xFFFFFFFF;
+
+  // 返回 CRC32 的低 16 位
+  return crc & 0xFFFF;
+}
+ */