\u505a\u5de5\u4e1a\u73b0\u573a\u8fd0\u7ef4\u7684\u670b\u53cb，\u5927\u6982\u7387\u90fd\u6709\u8fc7\u8dd1\u73b0\u573a\u5347\u7ea7\u7a0b\u5e8f\u7684\u7ecf\u5386\u3002
\n\u504f\u8fdc\u7684\u5316\u5de5\u56ed\u533a\u3001\u90ca\u5916\u7684\u6c61\u6c34\u5904\u7406\u5382\u3001\u5c71\u533a\u7684\u7ba1\u7ebf\u76d1\u6d4b\u7ad9，\u6709\u65f6\u5019\u6765\u56de\u5927\u534a\u5929，\u5c31\u4e3a\u4e86\u66ff\u6362\u4e00\u4e2a\u51e0\u5146\u7684\u7a0b\u5e8f\u5305\u3002\u9047\u4e0a\u7f51\u7edc\u6761\u4ef6\u5dee\u7684\u73b0\u573a，\u8fdeVPN\u90fd\u8fde\u4e0d\u7a33，\u8fdc\u7a0b\u4f20\u6587\u4ef6\u4f20\u5230\u4e00\u534a\u65ad\u8fde，\u91cd\u4f20\u53c8\u5f97\u4ece\u5934\u518d\u6765，\u6298\u817e\u4e00\u4e0b\u5348\u90fd\u4e0d\u4e00\u5b9a\u80fd\u641e\u5b9a\u3002
\n\u66f4\u5934\u75bc\u7684\u662f\u5347\u7ea7\u98ce\u9669\u3002\u7a0b\u5e8f\u66ff\u6362\u5230\u4e00\u534a\u8bbe\u5907\u65ad\u7535\u3001\u8fdb\u7a0b\u5d29\u6e83，\u8d77\u6765\u4e4b\u540e\u6587\u4ef6\u635f\u574f，\u8bbe\u5907\u76f4\u63a5\u8d77\u4e0d\u6765，\u4e5f\u5c31\u662f\u5e38\u8bf4\u7684\u201c\u53d8\u7816\u201d\u3002\u9047\u4e0a\u751f\u4ea7\u7ebf\u4e0d\u80fd\u505c\u7684\u573a\u666f，\u8fd9\u79cd\u4e8b\u6545\u8f7b\u5219\u51cf\u4ea7，\u91cd\u5219\u5f15\u53d1\u5b89\u5168\u95ee\u9898\u3002
\n\u5f88\u591a\u56e2\u961f\u505a\u8fdc\u7a0b\u5347\u7ea7，\u56fe\u7701\u4e8b\u5c31\u505a\u4e2a\u6587\u4ef6\u4f20\u8f93\u52a0\u6279\u5904\u7406\u66ff\u6362，\u770b\u7740\u80fd\u7528，\u4e00\u5230\u73b0\u573a\u5c31\u5404\u79cd\u7ffb\u8f66\u3002\u8fd9\u4e24\u5e74\u505a\u4e86\u5341\u51e0\u4e2a\u5de5\u4e1a\u9879\u76ee\u7684\u8fdc\u7a0b\u8fd0\u7ef4\u6539\u9020，\u8e29\u904d\u4e86\u4f20\u8f93\u4e2d\u65ad\u3001\u6587\u4ef6\u635f\u574f\u3001\u5347\u7ea7\u5931\u8d25\u3001\u56de\u6eda\u56f0\u96be\u8fd9\u4e9b\u5751，\u6700\u7ec8\u5b9a\u578b\u4e86\u4e00\u5957\u5de5\u4e1a\u7ea7\u7684\u5b89\u5168\u5347\u7ea7\u65b9\u6848：\u65ad\u70b9\u7eed\u4f20\u89e3\u51b3\u7f51\u7edc\u4e0d\u7a33\u5b9a\u7684\u95ee\u9898，\u6570\u5b57\u7b7e\u540d\u89e3\u51b3\u5b89\u5168\u7be1\u6539\u95ee\u9898，\u53cc\u5206\u533a\u52a0\u770b\u95e8\u72d7\u89e3\u51b3\u5347\u7ea7\u53d8\u7816\u7684\u95ee\u9898\u3002
\n\u6574\u5957\u65b9\u6848\u4ece\u7ec8\u7aef\u4ee3\u7406\u5230\u670d\u52a1\u7aef\u7ba1\u7406\u90fd\u6709\u5b8c\u6574\u7684\u5de5\u7a0b\u5b9e\u73b0，\u4eca\u5929\u628a\u6838\u5fc3\u903b\u8f91\u548c\u843d\u5730\u7ecf\u9a8c\u6574\u7406\u51fa\u6765，\u90fd\u662f\u73b0\u573a\u8dd1\u8fc7\u9a8c\u8bc1\u7684\u3002<\/p>\n
\u666e\u901a\u4e92\u8054\u7f51\u5e94\u7528\u7684\u5347\u7ea7\u903b\u8f91，\u653e\u5230\u5de5\u4e1a\u73b0\u573a\u57fa\u672c\u90fd\u4f1a\u6c34\u571f\u4e0d\u670d，\u6838\u5fc3\u539f\u56e0\u5c31\u5728\u4e8e\u5de5\u4e1a\u573a\u666f\u5bf9\u201c\u53ef\u9760\u6027\u201d\u548c\u201c\u53ef\u7528\u6027\u201d\u7684\u8981\u6c42\u8fdc\u9ad8\u4e8e\u666e\u901a\u573a\u666f\u3002\u603b\u7ed3\u4e0b\u6765\u6709\u56db\u4e2a\u7ed5\u4e0d\u5f00\u7684\u98ce\u9669\u70b9：<\/p>\n
\u5f88\u591a\u4eba\u505a\u8fdc\u7a0b\u5347\u7ea7\u53ea\u5173\u6ce8\u201c\u80fd\u4e0d\u80fd\u4f20\u8fc7\u53bb\u201d，\u4f46\u5de5\u4e1a\u7ea7\u5347\u7ea7\u7684\u6838\u5fc3\u662f：\u54ea\u6015\u5347\u7ea7\u8fc7\u7a0b\u4e2d\u51fa\u4efb\u4f55\u95ee\u9898，\u90fd\u4e0d\u80fd\u5f71\u54cd\u8bbe\u5907\u7684\u6b63\u5e38\u8fd0\u884c\u3002\u8fd9\u662f\u548c\u666e\u901a\u5e94\u7528\u5347\u7ea7\u6700\u672c\u8d28\u7684\u533a\u522b\u3002<\/p>\n
\u6574\u5957\u5347\u7ea7\u7cfb\u7edf\u91c7\u7528\u670d\u52a1\u7aef-\u7ec8\u7aef\u4ee3\u7406\u7684\u67b6\u6784\u8bbe\u8ba1，\u6838\u5fc3\u56f4\u7ed5\u201c\u53ef\u9760\u4f20\u8f93\u3001\u5b89\u5168\u6821\u9a8c\u3001\u6545\u969c\u81ea\u6108\u201d\u4e09\u4e2a\u76ee\u6807\u8bbe\u8ba1，\u5206\u4e3a\u4e94\u4e2a\u6838\u5fc3\u6a21\u5757：<\/p>\n
\u5b8c\u6574\u7684\u5347\u7ea7\u6d41\u7a0b\u662f：\u670d\u52a1\u7aef\u4e0b\u53d1\u5347\u7ea7\u6307\u4ee4\u2192\u7ec8\u7aef\u4ee3\u7406\u63a5\u6536\u540e\u5f00\u59cb\u65ad\u70b9\u7eed\u4f20\u4e0b\u8f7d\u2192\u4e0b\u8f7d\u5b8c\u6210\u540e\u9a8c\u7b7e\u3001\u6821\u9a8c\u5b8c\u6574\u6027\u2192\u6821\u9a8c\u901a\u8fc7\u540e\u5199\u5165\u5907\u4efd\u5206\u533a\u2192\u914d\u7f6e\u8fc1\u79fb\u2192\u8bbe\u7f6e\u4e0b\u6b21\u542f\u52a8\u5206\u533a\u2192\u8bbe\u5907\u91cd\u542f\u2192\u770b\u95e8\u72d7\u68c0\u6d4b\u65b0\u7a0b\u5e8f\u8fd0\u884c\u72b6\u6001\u2192\u8fd0\u884c\u6b63\u5e38\u5219\u5347\u7ea7\u5b8c\u6210，\u5f02\u5e38\u5219\u81ea\u52a8\u5207\u56de\u539f\u5206\u533a\u56de\u6eda\u3002<\/p>\n
\u65ad\u70b9\u7eed\u4f20\u7684\u6838\u5fc3\u662f\u628a\u5347\u7ea7\u5305\u62c6\u5206\u6210\u56fa\u5b9a\u5927\u5c0f\u7684\u5206\u7247，\u6bcf\u4f20\u5b8c\u4e00\u7247\u5c31\u8bb0\u5f55\u5f53\u524d\u504f\u79fb\u91cf，\u65ad\u8fde\u91cd\u8fde\u540e\u4ece\u5df2\u5b8c\u6210\u7684\u4f4d\u7f6e\u7ee7\u7eed\u4f20，\u4e0d\u7528\u91cd\u5934\u5f00\u59cb\u3002\u540c\u65f6\u6bcf\u4e00\u7247\u90fd\u505aCRC\u6821\u9a8c，\u51fa\u9519\u53ea\u91cd\u4f20\u51fa\u9519\u7684\u5206\u7247，\u5927\u5927\u63d0\u5347\u5f31\u7f51\u4e0b\u7684\u4f20\u8f93\u6548\u7387\u3002<\/p>\n
\u5b9e\u73b0\u601d\u8def：<\/p>\n
\u6838\u5fc3\u4ee3\u7801\u5b9e\u73b0（C# \u7ec8\u7aef\u4e0b\u8f7d\u7aef）：<\/p>\n
public class BreakpointDownloader
\n{
\n private readonly string _downloadUrl;
\n private readonly string _savePath;
\n private readonly int _chunkSize = 1024 * 1024; \/\/ 1MB\u5206\u7247
\n private long _downloadedOffset;<\/p>\n
public BreakpointDownloader(string downloadUrl, string savePath)
\n {
\n _downloadUrl = downloadUrl;
\n _savePath = savePath;
\n \/\/ \u8bfb\u53d6\u5df2\u4e0b\u8f7d\u7684\u504f\u79fb\u91cf
\n if (File.Exists(savePath + ".tmp"))
\n {
\n _downloadedOffset = new FileInfo(savePath + ".tmp").Length;
\n }
\n }<\/p>\n
public async Task<bool> DownloadAsync(CancellationToken cancellationToken)
\n {
\n try
\n {
\n using var fileStream = new FileStream(_savePath + ".tmp", FileMode.OpenOrCreate, FileAccess.Write);
\n fileStream.Seek(_downloadedOffset, SeekOrigin.Begin);<\/p>\n
using var httpClient = new HttpClient();
\n \/\/ \u8bbe\u7f6eRange\u5934，\u8bf7\u6c42\u6307\u5b9a\u504f\u79fb\u91cf\u4e4b\u540e\u7684\u5185\u5bb9
\n httpClient.DefaultRequestHeaders.Range = new RangeHeaderValue(_downloadedOffset, null);<\/p>\n
using var response = await httpClient.GetAsync(_downloadUrl, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
\n response.EnsureSuccessStatusCode();<\/p>\n
using var stream = await response.Content.ReadAsStreamAsync(cancellationToken);
\n var buffer = new byte[8192];
\n int bytesRead;
\n while ((bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length, cancellationToken)) > 0)
\n {
\n await fileStream.WriteAsync(buffer, 0, bytesRead, cancellationToken);
\n _downloadedOffset += bytesRead;
\n }<\/p>\n
\/\/ \u4e0b\u8f7d\u5b8c\u6210，\u91cd\u547d\u540d\u4e34\u65f6\u6587\u4ef6
\n fileStream.Close();
\n File.Move(_savePath + ".tmp", _savePath, true);
\n return true;
\n }
\n catch (Exception)
\n {
\n \/\/ \u5f02\u5e38\u4e0d\u5220\u9664\u4e34\u65f6\u6587\u4ef6，\u4fdd\u7559\u65ad\u70b9
\n return false;
\n }
\n }
\n}<\/p>\n
\u5b9e\u9645\u9879\u76ee\u4e2d，\u8fd8\u53ef\u4ee5\u52a0\u4e0a\u4e0b\u8f7d\u901f\u5ea6\u9650\u5236，\u907f\u514d\u5347\u7ea7\u4f20\u8f93\u5360\u7528\u592a\u591a\u5e26\u5bbd\u5f71\u54cd\u751f\u4ea7\u4e1a\u52a1；\u540c\u65f6\u52a0\u4e0a\u8d85\u65f6\u91cd\u8bd5，\u7f51\u7edc\u6296\u52a8\u65f6\u81ea\u52a8\u91cd\u8bd5，\u4e0d\u7528\u4eba\u5de5\u5e72\u9884\u3002<\/p>\n
\u8fd9\u4e00\u6b65\u662f\u5b89\u5168\u7684\u5e95\u7ebf，\u786e\u4fdd\u5347\u7ea7\u5305\u662f\u5b98\u65b9\u53d1\u5e03\u7684\u3001\u6ca1\u6709\u88ab\u7be1\u6539，\u540c\u65f6\u786e\u4fdd\u5347\u7ea7\u5305\u548c\u8bbe\u5907\u578b\u53f7\u3001\u7248\u672c\u5339\u914d，\u907f\u514d\u53d1\u9519\u5305\u3002
\n\u6211\u4eec\u91c7\u7528RSA\u975e\u5bf9\u79f0\u52a0\u5bc6\u65b9\u6848：\u670d\u52a1\u7aef\u4fdd\u5b58\u79c1\u94a5，\u53d1\u5e03\u5347\u7ea7\u5305\u65f6\u7528\u79c1\u94a5\u5bf9\u5305\u7684MD5\u503c\u7b7e\u540d；\u7ec8\u7aef\u4fdd\u5b58\u516c\u94a5，\u4e0b\u8f7d\u5b8c\u6210\u540e\u7528\u516c\u94a5\u9a8c\u7b7e，\u7b7e\u540d\u4e0d\u901a\u8fc7\u76f4\u63a5\u4e22\u5f03\u5347\u7ea7\u5305，\u7edd\u4e0d\u6267\u884c\u5347\u7ea7\u3002<\/p>\n
\u9664\u4e86\u7b7e\u540d\u6821\u9a8c，\u8fd8\u8981\u505a\u4e09\u91cd\u5339\u914d\u6821\u9a8c：<\/p>\n
\u6838\u5fc3\u9a8c\u7b7e\u4ee3\u7801：<\/p>\n
public class PackageVerifier
\n{
\n private readonly string _publicKey; \/\/ \u7ec8\u7aef\u5185\u7f6e\u516c\u94a5<\/p>\n
public PackageVerifier(string publicKey)
\n {
\n _publicKey = publicKey;
\n }<\/p>\n
public bool VerifySignature(string packagePath, string signature)
\n {
\n try
\n {
\n \/\/ \u8ba1\u7b97\u6587\u4ef6MD5
\n string fileMd5 = CalculateFileMd5(packagePath);<\/p>\n
using var rsa = RSA.Create();
\n rsa.FromXmlString(_publicKey);<\/p>\n
\/\/ \u9a8c\u7b7e
\n var signatureBytes = Convert.FromBase64String(signature);
\n var md5Bytes = Encoding.UTF8.GetBytes(fileMd5);<\/p>\n
return rsa.VerifyData(md5Bytes, signatureBytes, HashAlgorithmName.MD5, RSASignaturePadding.Pkcs1);
\n }
\n catch
\n {
\n return false;
\n }
\n }<\/p>\n
private string CalculateFileMd5(string filePath)
\n {
\n using var md5 = MD5.Create();
\n using var stream = File.OpenRead(filePath);
\n byte[] hash = md5.ComputeHash(stream);
\n return BitConverter.ToString(hash).Replace("-", "").ToLowerInvariant();
\n }
\n}<\/p>\n
\u8fd9\u91cc\u8981\u6ce8\u610f，\u516c\u94a5\u4e00\u5b9a\u8981\u5185\u7f6e\u5728\u7ec8\u7aef\u7a0b\u5e8f\u91cc，\u4e0d\u8981\u901a\u8fc7\u7f51\u7edc\u4e0b\u53d1，\u907f\u514d\u88ab\u7be1\u6539\u3002\u79c1\u94a5\u8981\u4e25\u683c\u4fdd\u7ba1，\u53ea\u5728\u53d1\u5e03\u5347\u7ea7\u5305\u7684\u65f6\u5019\u4f7f\u7528\u3002<\/p>\n
\u8fd9\u662f\u6574\u5957\u65b9\u6848\u91cc\u6700\u6838\u5fc3\u7684\u8bbe\u8ba1，\u4e5f\u662f\u5de5\u4e1a\u7ea7\u5347\u7ea7\u548c\u666e\u901a\u5347\u7ea7\u6700\u5927\u7684\u533a\u522b\u3002
\n\u5f88\u591a\u4eba\u5347\u7ea7\u7a0b\u5e8f\u76f4\u63a5\u8986\u76d6\u539f\u6587\u4ef6，\u4e00\u65e6\u5347\u7ea7\u4e2d\u65ad\u6216\u8005\u65b0\u7248\u672c\u6709\u95ee\u9898，\u8bbe\u5907\u5c31\u8d77\u4e0d\u6765\u3002\u53cc\u5206\u533a\u7684\u601d\u8def\u5c31\u662f：\u6c38\u8fdc\u4e0d\u76f4\u63a5\u4fee\u6539\u6b63\u5728\u8fd0\u884c\u7684\u7a0b\u5e8f\u5206\u533a，\u5347\u7ea7\u5168\u90e8\u5728\u5907\u7528\u5206\u533a\u64cd\u4f5c，\u786e\u8ba4\u6ca1\u95ee\u9898\u4e86\u518d\u5207\u6362\u3002<\/p>\n
\u8bbe\u5907\u4e0a\u5212\u5206\u4e24\u4e2a\u72ec\u7acb\u7684\u7a0b\u5e8f\u76ee\u5f55：<\/p>\n
\u4e24\u4e2a\u5206\u533a\u5b8c\u5168\u72ec\u7acb，\u5347\u7ea7\u8fc7\u7a0b\u4e2d\u54ea\u6015\u65ad\u7535\u3001\u5d29\u6e83，\u8fd0\u884c\u5206\u533a\u7684\u7a0b\u5e8f\u5b8c\u597d\u65e0\u635f，\u8bbe\u5907\u91cd\u542f\u540e\u8fd8\u662f\u4ece\u539f\u6765\u7684\u8fd0\u884c\u5206\u533a\u542f\u52a8，\u4e0d\u4f1a\u5f71\u54cd\u6b63\u5e38\u4e1a\u52a1\u3002<\/p>\n
\u6838\u5fc3\u5206\u533a\u5207\u6362\u903b\u8f91：<\/p>\n
public class PartitionManager
\n{
\n private const string ActiveConfigFile = "boot.conf";
\n private readonly string _partitionA;
\n private readonly string _partitionB;<\/p>\n
public PartitionManager(string basePath)
\n {
\n _partitionA = Path.Combine(basePath, "active");
\n _partitionB = Path.Combine(basePath, "standby");
\n }<\/p>\n
\/\/ \u83b7\u53d6\u5f53\u524d\u8fd0\u884c\u5206\u533a
\n public string GetActivePartition()
\n {
\n if (!File.Exists(ActiveConfigFile))
\n return _partitionA;<\/p>\n
var config = File.ReadAllText(ActiveConfigFile).Trim();
\n return config == "B" ? _partitionB : _partitionA;
\n }<\/p>\n
\/\/ \u83b7\u53d6\u5907\u7528\u5206\u533a
\n public string GetStandbyPartition()
\n {
\n return GetActivePartition() == _partitionA ? _partitionB : _partitionA;
\n }<\/p>\n
\/\/ \u8bbe\u7f6e\u4e0b\u6b21\u542f\u52a8\u5206\u533a
\n public void SetNextBootPartition(bool isStandby)
\n {
\n string target = isStandby ?
\n (GetActivePartition() == _partitionA ? "B" : "A") :
\n (GetActivePartition() == _partitionA ? "A" : "B");<\/p>\n
File.WriteAllText(ActiveConfigFile, target);
\n }<\/p>\n
\/\/ \u56de\u6eda\u5230\u4e0a\u4e00\u4e2a\u5206\u533a
\n public void Rollback()
\n {
\n SetNextBootPartition(false);
\n }
\n}<\/p>\n
\u770b\u95e8\u72d7\u4e00\u5b9a\u8981\u505a\u6210\u72ec\u7acb\u7684\u8fdb\u7a0b，\u6700\u597d\u662f\u7cfb\u7edf\u670d\u52a1，\u548c\u4e3b\u7a0b\u5e8f\u5b8c\u5168\u89e3\u8026\u3002\u4e0d\u80fd\u8ba9\u4e3b\u7a0b\u5e8f\u81ea\u5df1\u76d1\u63a7\u81ea\u5df1，\u5426\u5219\u4e3b\u7a0b\u5e8f\u5d29\u4e86，\u770b\u95e8\u72d7\u4e5f\u8ddf\u7740\u6ca1\u4e86，\u8d77\u4e0d\u5230\u4f5c\u7528\u3002<\/p>\n
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