85 lines
2.7 KiB
C#
85 lines
2.7 KiB
C#
using System;
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using System.IO;
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using System.IO.Pipelines;
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using System.Threading;
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using System.Threading.Tasks;
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using Microsoft.AspNetCore.Http.Features;
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using Microsoft.Extensions.Logging;
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namespace Yavsc
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{
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class YaSendFileWrapper : IHttpResponseBodyFeature
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{
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private readonly Stream _output;
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private readonly ILogger _logger;
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internal YaSendFileWrapper(Stream output, ILogger logger)
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{
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_output = output;
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_logger = logger;
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}
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public async Task SendFileAsync(string fileName, long offset, long? length, CancellationToken cancel)
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{
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cancel.ThrowIfCancellationRequested();
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if (string.IsNullOrWhiteSpace(fileName))
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{
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throw new ArgumentNullException("fileName");
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}
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if (!File.Exists(fileName))
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{
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throw new FileNotFoundException(string.Empty, fileName);
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}
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FileInfo fileInfo = new FileInfo(fileName);
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if (offset < 0 || offset > fileInfo.Length)
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{
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throw new ArgumentOutOfRangeException("offset", offset, string.Empty);
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}
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if (length.HasValue && (length.Value < 0 || length.Value > fileInfo.Length - offset))
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{
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throw new ArgumentOutOfRangeException("length", length, string.Empty);
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}
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FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, maxbufferlen, FileOptions.Asynchronous | FileOptions.SequentialScan);
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try
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{
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fileStream.Seek(offset, SeekOrigin.Begin);
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_logger.LogInformation(string.Format("Copying bytes range:{0},{1} filename:{2} ", offset, (!length.HasValue) ? null : (offset + length), fileName));
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// await CopyToAsync(fileStream, _output, length, cancel);
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await CopyToAsync(fileStream, _output);
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}
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finally
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{
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fileStream.Dispose();
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}
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}
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private const int maxbufferlen = 65536;
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public Stream Stream => throw new NotImplementedException();
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public PipeWriter Writer => throw new NotImplementedException();
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private async Task CopyToAsync(FileStream fileStream, Stream output)
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{
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await Task.Run(() => fileStream.CopyTo(output, maxbufferlen));
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}
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public void DisableBuffering()
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{
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throw new NotImplementedException();
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}
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public Task StartAsync(CancellationToken cancellationToken = default)
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{
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throw new NotImplementedException();
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}
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public Task CompleteAsync()
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{
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throw new NotImplementedException();
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}
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}
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}
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