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@@ -0,0 +1,163 @@
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+// Licensed to the .NET Foundation under one or more agreements.
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+// The .NET Foundation licenses this file to you under the MIT license.
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+
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+using System.Globalization;
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+using System.Text;
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+using BenchmarkDotNet.Attributes;
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+using BenchmarkDotNet.Order;
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+using static System.Net.Mime.MediaTypeNames;
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+
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+namespace Microsoft.AspNetCore.WebUtilities.Microbenchmarks;
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+
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+public class MultipartReaderBenchmark
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+{
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+ MemoryStream _stream;
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+
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+ [Params(6, 28, 70)]
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+ public int BoundarySize { get; set; }
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+
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+ [Params(1, 2, 3)]
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+ public int SectionCount { get; set; }
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+
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+ [Params(true, false)]
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+ public bool LargePayload { get; set; }
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+
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+ private string Boundary { get; set; }
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+
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+ [GlobalSetup]
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+ public void Setup()
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+ {
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+ string data;
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+ switch (BoundarySize)
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+ {
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+ case 6:
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+ Boundary = "abc123";
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+ break;
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+ case 28:
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+ Boundary = "9051914041544843365972754266";
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+ break;
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+ case 70:
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+ Boundary = "WbQvpJcaxJRjMqwLdioBSOyJk3fHYdo9hLCOSBkHYW70pU71tH3lJq6ZUcSErOl0NRn5uT";
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+ break;
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+ default:
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+ throw new InvalidOperationException(nameof(BoundarySize));
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+ }
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+
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+ switch (SectionCount)
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+ {
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+ case 1:
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+ data = $"--{Boundary}\r\n" +
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+"Content-Disposition: form-data; name=\"text\"\r\n" +
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+"\r\n" +
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+$"text default{new string('a', LargePayload ? 10000000 : 0)}\r\n" +
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+$"--{Boundary}--\r\n"; ;
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+ break;
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+ case 2:
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+ data = $"--{Boundary}\r\n" +
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+"Content-Disposition: form-data; name=\"text\"\r\n" +
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+"\r\n" +
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+"text default\r\n" +
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+$"--{Boundary}\r\n" +
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+"Content-Disposition: form-data; name=\"file1\"; filename=\"a.txt\"\r\n" +
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+"Content-Type: text/plain\r\n" +
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+"\r\n" +
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+$"Content of a.txt.{new string('a', LargePayload ? 10000000 : 0)}\r\n" +
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+"\r\n" +
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+$"--{Boundary}--\r\n";
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+ break;
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+ case 3:
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+ data = $"--{Boundary}\r\n" +
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+"Content-Disposition: form-data; name=\"text\"\r\n" +
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+"\r\n" +
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+"text default\r\n" +
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+$"--{Boundary}\r\n" +
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+"Content-Disposition: form-data; name=\"file1\"; filename=\"a.txt\"\r\n" +
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+"Content-Type: text/plain\r\n" +
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+"\r\n" +
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+$"Content of a.txt{new string('a', LargePayload ? 10000000 : 0)}\r\n" +
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+"\r\n" +
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+$"--{Boundary}\r\n" +
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+"Content-Disposition: form-data; name=\"file2\"; filename=\"a.html\"\r\n" +
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+"Content-Type: text/html\r\n" +
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+"\r\n" +
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+"<!DOCTYPE html><title>Content of a.html.</title>\r\n" +
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+"\r\n" +
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+$"--{Boundary}--\r\n";
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+ break;
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+ default:
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+ throw new ArgumentOutOfRangeException(nameof(SectionCount));
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+ }
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+ _stream = new MemoryStream(Encoding.UTF8.GetBytes(data));
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+ }
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+
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+ [Benchmark]
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+ public async Task MultipartReaderParsing()
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+ {
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+ var reader = new MultipartReader(Boundary, _stream);
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+
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+ var sectionCount = 0;
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+ MultipartSection section;
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+ do
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+ {
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+ section = await reader.ReadNextSectionAsync();
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+ sectionCount += section is not null ? 1 : 0;
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+ }
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+ while (section is not null);
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+
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+ _stream.Position = 0;
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+
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+ if (sectionCount != SectionCount)
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+ {
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+ throw new InvalidOperationException();
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+ }
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+ }
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+
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+ [Benchmark]
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+ public async Task MultipartReaderParsingWithRead()
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+ {
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+ var reader = new MultipartReader(Boundary, _stream);
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+
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+ var sectionCount = 0;
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+ MultipartSection section;
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+ do
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+ {
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+ section = await reader.ReadNextSectionAsync();
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+ sectionCount += section is not null ? 1 : 0;
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+
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+ section?.Body.CopyTo(NullStream.Instance);
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+ }
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+ while (section is not null);
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+
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+ _stream.Position = 0;
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+
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+ if (sectionCount != SectionCount)
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+ {
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+ throw new InvalidOperationException();
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+ }
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+ }
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+
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+ public class NullStream : Stream
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+ {
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+ public static readonly NullStream Instance = new NullStream();
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+
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+ public override bool CanRead => true;
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+
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+ public override bool CanSeek => true;
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+
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+ public override bool CanWrite => true;
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+
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+ public override long Length => 0;
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+
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+ public override long Position { get => 0; set { } }
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+
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+ public override void Flush() { }
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+
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+ public override int Read(byte[] buffer, int offset, int count) => 0;
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+
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+ public override long Seek(long offset, SeekOrigin origin) => 0;
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+
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+ public override void SetLength(long value) { }
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+
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+ public override void Write(byte[] buffer, int offset, int count) { }
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+ }
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+}
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Brennan