修复断点续传功能 (#1050)

Author: nilaoda

BBDown/BBDownDownloadUtil.cs

@@ -26,8 +26,14 @@ public class DownloadConfig
     private static async Task RangeDownloadToTmpAsync(int id, string url, string tmpName, long fromPosition, long? toPosition, Action<int, long, long> onProgress, bool failOnRangeNotSupported = false)
     {
         DateTimeOffset? lastTime = File.Exists(tmpName) ? new FileInfo(tmpName).LastWriteTimeUtc : null;
-        using var fileStream = new FileStream(tmpName, FileMode.Create);
+        using var fileStream = new FileStream(tmpName, FileMode.OpenOrCreate);
         fileStream.Seek(0, SeekOrigin.End);
+        if (toPosition > 0 && fileStream.Position == toPosition - fromPosition + 1)
+        {
+            // 已下载完成 直接汇报进度并跳过下载
+            onProgress(id, fileStream.Position, fileStream.Position);
+            return;
+        }
         var downloadedBytes = fromPosition + fileStream.Position;
 
         using var httpRequestMessage = new HttpRequestMessage();

BBDown/Program.Methods.cs

@@ -503,8 +503,6 @@ private static async Task DownloadTrackAsync(string url, string destPath, Downlo
     {
         if (downloadConfig.MultiThread && !url.Contains("-cmcc-"))
         {
-            // 下载前先清理残片
-            foreach (var file in new DirectoryInfo(Path.GetDirectoryName(destPath)!).EnumerateFiles("*.?clip")) file.Delete();
             await MultiThreadDownloadFileAsync(url, destPath, downloadConfig);
             Log($"合并{(video ? "视频" : "音频")}分片...");
             CombineMultipleFilesIntoSingleFile(GetFiles(Path.GetDirectoryName(destPath)!, $".{(video ? "v" : "a")}clip"), destPath);

BBDown/ProgressBar.cs

@@ -93,10 +93,9 @@ private void TimerHandler(object? state)
 			if (disposed) return;
 
 			int progressBlockCount = (int)(currentProgress * blockCount);
-			int percent = (int)(currentProgress * 100);
-			string text = string.Format("                            [{0}{1}] {2,3}% {3}{4}",
-				new string('#', progressBlockCount), new string('-', blockCount - progressBlockCount),
-				percent,
+			double percent = currentProgress * 100;
+			string text = string.Format("                            [{0}{1}] {2,3:0.00}% {3}{4}",
+				new string('#', progressBlockCount), new string('-', blockCount - progressBlockCount), percent,
 				animation[animationIndex++ % animation.Length],
 				speedString);
 			UpdateText(text);