支持本地m3u8的下载

src/N_m3u8DL-RE.Common/Util/HTTPUtil.cs

@@ -84,6 +84,10 @@ namespace N_m3u8DL_RE.Common.Util
 
         public static async Task<byte[]> GetBytesAsync(string url, Dictionary<string, string>? headers = null)
         {
+            if (url.StartsWith("file:"))
+            {
+                return await File.ReadAllBytesAsync(new Uri(url).LocalPath);
+            }
             byte[] bytes = new byte[0];
             var webResponse = await DoGetAsync(url, headers);
             bytes = await webResponse.Content.ReadAsByteArrayAsync();

src/N_m3u8DL-RE.Parser/Processor/HLS/DefaultHLSKeyProcessor.cs

@@ -73,10 +73,10 @@ namespace N_m3u8DL_RE.Parser.Processor.HLS
                 else if (!string.IsNullOrEmpty(uri))
                 {
                     var retryCount = parserConfig.KeyRetryCount;
+                    var segUrl = PreProcessUrl(ParserUtil.CombineURL(m3u8Url, uri), parserConfig);
                 getHttpKey:
                     try
                     {
-                        var segUrl = PreProcessUrl(ParserUtil.CombineURL(m3u8Url, uri), parserConfig);
                         var bytes = HTTPUtil.GetBytesAsync(segUrl, parserConfig.Headers).Result;
                         encryptInfo.Key = bytes;
                     }

src/N_m3u8DL-RE/CommandLine/CommandInvoker.cs

@@ -431,7 +431,7 @@ namespace N_m3u8DL_RE.CommandLine
                 Environment.Exit(0);
             }
 
-            var rootCommand = new RootCommand("N_m3u8DL-RE (Beta version) 20220925")
+            var rootCommand = new RootCommand("N_m3u8DL-RE (Beta version) 20220927")
             {
                 Input, TmpDir, SaveDir, SaveName, BaseUrl, ThreadCount, DownloadRetryCount, AutoSelect, SkipMerge, SkipDownload, CheckSegmentsCount,
                 BinaryMerge, DelAfterDone, WriteMetaJson, AppendUrlParams, ConcurrentDownload, Headers, /**SavePattern,**/ SubOnly, SubtitleFormat, AutoSubtitleFix,

src/N_m3u8DL-RE/Util/DownloadUtil.cs

@@ -2,14 +2,8 @@
 using N_m3u8DL_RE.Common.Resource;
 using N_m3u8DL_RE.Common.Util;
 using N_m3u8DL_RE.Entity;
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Net;
-using System.Net.Http;
 using System.Net.Http.Headers;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace N_m3u8DL_RE.Util
 {
@@ -17,9 +11,39 @@ namespace N_m3u8DL_RE.Util
     {
         private static readonly HttpClient AppHttpClient = HTTPUtil.AppHttpClient;
 
+        private static async Task<DownloadResult> CopyFileAsync(string sourceFile, string path, SpeedContainer speedContainer, long? fromPosition = null, long? toPosition = null)
+        {
+            using var inputStream = new FileStream(sourceFile, FileMode.Open, FileAccess.Read, FileShare.Read);
+            using var outputStream = new FileStream(path, FileMode.OpenOrCreate);
+            inputStream.Seek(fromPosition ?? 0L, SeekOrigin.Begin);
+            var expect = (toPosition ?? inputStream.Length) - inputStream.Position + 1;
+            if (expect == inputStream.Length + 1)
+            {
+                await inputStream.CopyToAsync(outputStream);
+                speedContainer.Add(inputStream.Length);
+            }
+            else
+            {
+                var buffer = new byte[expect];
+                await inputStream.ReadAsync(buffer);
+                await outputStream.WriteAsync(buffer, 0, buffer.Length);
+                speedContainer.Add(buffer.Length);
+            }
+            return new DownloadResult()
+            {
+                ActualContentLength = outputStream.Length,
+                ActualFilePath = path
+            };
+        }
+
         public static async Task<DownloadResult> DownloadToFileAsync(string url, string path, SpeedContainer speedContainer, Dictionary<string, string>? headers = null, long? fromPosition = null, long? toPosition = null)
         {
             Logger.Debug(ResString.fetch + url);
+            if (url.StartsWith("file:"))
+            {
+                var file = new Uri(url).LocalPath;
+                return await CopyFileAsync(file, path, speedContainer, fromPosition, toPosition);
+            }
             using var request = new HttpRequestMessage(HttpMethod.Get, new Uri(url));
             if (fromPosition != null || toPosition != null)
                 request.Headers.Range = new(fromPosition, toPosition);