636 lines
25 KiB
C#
636 lines
25 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Text;
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namespace CodeGenerator
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{
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// This project can output the Class library as a NuGet Package.
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// To enable this option, right-click on the project and select the Properties menu item. In the Build tab select "Produce outputs on build".
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public class KnownHeaders
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{
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static string Each<T>(IEnumerable<T> values, Func<T, string> formatter)
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{
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return values.Any() ? values.Select(formatter).Aggregate((a, b) => a + b) : "";
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}
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static string If(bool condition, Func<string> formatter)
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{
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return condition ? formatter() : "";
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}
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static string AppendSwitch(IEnumerable<IGrouping<int, KnownHeader>> values, string className) =>
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$@"var pUL = (ulong*)pUB;
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var pUI = (uint*)pUB;
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var pUS = (ushort*)pUB;
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var stringValue = new StringValues(value);
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switch (keyLength)
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{{{Each(values, byLength => $@"
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case {byLength.Key}:
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{{{Each(byLength, header => $@"
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if ({header.EqualIgnoreCaseBytes()})
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{{{(header.Identifier == "ContentLength" ? $@"
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if (_contentLength.HasValue)
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{{
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ThrowMultipleContentLengthsException();
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}}
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else
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{{
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_contentLength = ParseContentLength(value);
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}}
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return;" : $@"
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if ({header.TestBit()})
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{{
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_headers._{header.Identifier} = AppendValue(_headers._{header.Identifier}, value);
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}}
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else
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{{
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{header.SetBit()};
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_headers._{header.Identifier} = stringValue;{(header.EnhancedSetter == false ? "" : $@"
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_headers._raw{header.Identifier} = null;")}
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}}
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return;")}
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}}
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")}}}
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break;
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")}}}";
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class KnownHeader
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{
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public string Name { get; set; }
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public int Index { get; set; }
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public string Identifier => Name.Replace("-", "");
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public byte[] Bytes => Encoding.ASCII.GetBytes($"\r\n{Name}: ");
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public int BytesOffset { get; set; }
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public int BytesCount { get; set; }
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public bool EnhancedSetter { get; set; }
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public bool PrimaryHeader { get; set; }
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public string TestBit() => $"(_bits & {1L << Index}L) != 0";
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public string TestTempBit() => $"(tempBits & {1L << Index}L) != 0";
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public string TestNotTempBit() => $"(tempBits & ~{1L << Index}L) == 0";
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public string TestNotBit() => $"(_bits & {1L << Index}L) == 0";
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public string SetBit() => $"_bits |= {1L << Index}L";
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public string ClearBit() => $"_bits &= ~{1L << Index}L";
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public string EqualIgnoreCaseBytes()
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{
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var result = "";
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var delim = "";
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var index = 0;
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while (index != Name.Length)
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{
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if (Name.Length - index >= 8)
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{
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result += delim + Term(Name, index, 8, "pUL", "uL");
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index += 8;
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}
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else if (Name.Length - index >= 4)
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{
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result += delim + Term(Name, index, 4, "pUI", "u");
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index += 4;
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}
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else if (Name.Length - index >= 2)
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{
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result += delim + Term(Name, index, 2, "pUS", "u");
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index += 2;
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}
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else
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{
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result += delim + Term(Name, index, 1, "pUB", "u");
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index += 1;
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}
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delim = " && ";
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}
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return $"({result})";
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}
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protected string Term(string name, int offset, int count, string array, string suffix)
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{
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ulong mask = 0;
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ulong comp = 0;
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for (var scan = 0; scan < count; scan++)
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{
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var ch = (byte)name[offset + count - scan - 1];
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var isAlpha = (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z');
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comp = (comp << 8) + (ch & (isAlpha ? 0xdfu : 0xffu));
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mask = (mask << 8) + (isAlpha ? 0xdfu : 0xffu);
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}
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return $"(({array}[{offset / count}] & {mask}{suffix}) == {comp}{suffix})";
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}
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}
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public static string GeneratedFile()
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{
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var requestPrimaryHeaders = new[]
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{
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"Accept",
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"Host",
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"User-Agent"
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};
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var responsePrimaryHeaders = new[]
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{
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"Connection",
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"Date",
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"Content-Type",
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"Server",
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};
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var commonHeaders = new[]
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{
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"Cache-Control",
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"Connection",
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"Date",
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"Keep-Alive",
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"Pragma",
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"Trailer",
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"Transfer-Encoding",
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"Upgrade",
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"Via",
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"Warning",
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"Allow",
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"Content-Type",
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"Content-Encoding",
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"Content-Language",
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"Content-Location",
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"Content-MD5",
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"Content-Range",
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"Expires",
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"Last-Modified"
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};
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// http://www.w3.org/TR/cors/#syntax
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var corsRequestHeaders = new[]
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{
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"Origin",
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"Access-Control-Request-Method",
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"Access-Control-Request-Headers",
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};
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var requestHeaders = commonHeaders.Concat(new[]
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{
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"Accept",
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"Accept-Charset",
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"Accept-Encoding",
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"Accept-Language",
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"Authorization",
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"Cookie",
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"Expect",
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"From",
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"Host",
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"If-Match",
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"If-Modified-Since",
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"If-None-Match",
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"If-Range",
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"If-Unmodified-Since",
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"Max-Forwards",
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"Proxy-Authorization",
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"Referer",
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"Range",
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"TE",
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"Translate",
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"User-Agent",
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})
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.Concat(corsRequestHeaders)
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.Select((header, index) => new KnownHeader
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{
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Name = header,
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Index = index,
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PrimaryHeader = requestPrimaryHeaders.Contains(header)
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})
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.Concat(new[] { new KnownHeader
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{
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Name = "Content-Length",
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Index = -1,
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PrimaryHeader = requestPrimaryHeaders.Contains("Content-Length")
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}})
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.ToArray();
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Debug.Assert(requestHeaders.Length <= 64);
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Debug.Assert(requestHeaders.Max(x => x.Index) <= 62);
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var enhancedHeaders = new[]
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{
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"Connection",
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"Server",
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"Date",
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"Transfer-Encoding"
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};
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// http://www.w3.org/TR/cors/#syntax
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var corsResponseHeaders = new[]
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{
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"Access-Control-Allow-Credentials",
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"Access-Control-Allow-Headers",
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"Access-Control-Allow-Methods",
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"Access-Control-Allow-Origin",
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"Access-Control-Expose-Headers",
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"Access-Control-Max-Age",
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};
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var responseHeaders = commonHeaders.Concat(new[]
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{
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"Accept-Ranges",
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"Age",
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"ETag",
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"Location",
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"Proxy-Authenticate",
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"Retry-After",
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"Server",
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"Set-Cookie",
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"Vary",
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"WWW-Authenticate",
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})
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.Concat(corsResponseHeaders)
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.Select((header, index) => new KnownHeader
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{
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Name = header,
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Index = index,
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EnhancedSetter = enhancedHeaders.Contains(header),
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PrimaryHeader = responsePrimaryHeaders.Contains(header)
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})
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.Concat(new[] { new KnownHeader
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{
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Name = "Content-Length",
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Index = -1,
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EnhancedSetter = enhancedHeaders.Contains("Content-Length"),
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PrimaryHeader = responsePrimaryHeaders.Contains("Content-Length")
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}})
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.ToArray();
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// 63 for reponseHeaders as it steals one bit for Content-Length in CopyTo(ref MemoryPoolIterator output)
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Debug.Assert(responseHeaders.Length <= 63);
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Debug.Assert(responseHeaders.Max(x => x.Index) <= 62);
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var loops = new[]
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{
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new
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{
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Headers = requestHeaders,
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HeadersByLength = requestHeaders.GroupBy(x => x.Name.Length),
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ClassName = "FrameRequestHeaders",
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Bytes = default(byte[])
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},
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new
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{
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Headers = responseHeaders,
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HeadersByLength = responseHeaders.GroupBy(x => x.Name.Length),
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ClassName = "FrameResponseHeaders",
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Bytes = responseHeaders.SelectMany(header => header.Bytes).ToArray()
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}
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};
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foreach (var loop in loops.Where(l => l.Bytes != null))
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{
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var offset = 0;
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foreach (var header in loop.Headers)
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{
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header.BytesOffset = offset;
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header.BytesCount += header.Bytes.Length;
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offset += header.BytesCount;
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}
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}
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return $@"// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.IO.Pipelines;
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using Microsoft.AspNetCore.Server.Kestrel.Internal.Infrastructure;
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using Microsoft.Extensions.Primitives;
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using Microsoft.Net.Http.Headers;
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namespace Microsoft.AspNetCore.Server.Kestrel.Internal.Http
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{{
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{Each(loops, loop => $@"
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public partial class {loop.ClassName}
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{{{(loop.Bytes != null ?
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$@"
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private static byte[] _headerBytes = new byte[]
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{{
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{Each(loop.Bytes, b => $"{b},")}
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}};"
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: "")}
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private long _bits = 0;
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private HeaderReferences _headers;
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{Each(loop.Headers, header => $@"
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public StringValues Header{header.Identifier}
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{{{(header.Identifier == "ContentLength" ? $@"
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get
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{{
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StringValues value;
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if (_contentLength.HasValue)
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{{
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value = new StringValues(HeaderUtilities.FormatNonNegativeInt64(_contentLength.Value));
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}}
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return value;
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}}
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set
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{{
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_contentLength = ParseContentLength(value);
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}}" : $@"
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get
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{{
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StringValues value;
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if ({header.TestBit()})
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{{
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value = _headers._{header.Identifier};
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}}
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return value;
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}}
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set
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{{
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{header.SetBit()};
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_headers._{header.Identifier} = value; {(header.EnhancedSetter == false ? "" : $@"
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_headers._raw{header.Identifier} = null;")}
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}}")}
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}}")}
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{Each(loop.Headers.Where(header => header.EnhancedSetter), header => $@"
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public void SetRaw{header.Identifier}(StringValues value, byte[] raw)
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{{
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{header.SetBit()};
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_headers._{header.Identifier} = value;
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_headers._raw{header.Identifier} = raw;
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}}")}
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protected override int GetCountFast()
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{{
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return (_contentLength.HasValue ? 1 : 0 ) + BitCount(_bits) + (MaybeUnknown?.Count ?? 0);
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}}
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protected override bool TryGetValueFast(string key, out StringValues value)
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{{
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switch (key.Length)
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{{{Each(loop.HeadersByLength, byLength => $@"
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case {byLength.Key}:
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{{{Each(byLength, header => $@"
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if (""{header.Name}"".Equals(key, StringComparison.OrdinalIgnoreCase))
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{{{(header.Identifier == "ContentLength" ? @"
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if (_contentLength.HasValue)
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{
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value = HeaderUtilities.FormatNonNegativeInt64(_contentLength.Value);
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return true;
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}
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return false;" : $@"
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if ({header.TestBit()})
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{{
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value = _headers._{header.Identifier};
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return true;
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}}
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return false;")}
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}}")}
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}}
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break;")}
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}}
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return MaybeUnknown?.TryGetValue(key, out value) ?? false;
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}}
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protected override void SetValueFast(string key, StringValues value)
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{{{(loop.ClassName == "FrameResponseHeaders" ? @"
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ValidateHeaderCharacters(value);" : "")}
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switch (key.Length)
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{{{Each(loop.HeadersByLength, byLength => $@"
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case {byLength.Key}:
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{{{Each(byLength, header => $@"
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if (""{header.Name}"".Equals(key, StringComparison.OrdinalIgnoreCase))
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{{{(header.Identifier == "ContentLength" ? $@"
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_contentLength = ParseContentLength(value.ToString());" : $@"
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{header.SetBit()};
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_headers._{header.Identifier} = value;{(header.EnhancedSetter == false ? "" : $@"
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_headers._raw{header.Identifier} = null;")}")}
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return;
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}}")}
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}}
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break;")}
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}}
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SetValueUnknown(key, value);
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}}
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protected override bool AddValueFast(string key, StringValues value)
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{{{(loop.ClassName == "FrameResponseHeaders" ? @"
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ValidateHeaderCharacters(value);" : "")}
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switch (key.Length)
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{{{Each(loop.HeadersByLength, byLength => $@"
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case {byLength.Key}:
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{{{Each(byLength, header => $@"
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if (""{header.Name}"".Equals(key, StringComparison.OrdinalIgnoreCase))
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{{{(header.Identifier == "ContentLength" ? $@"
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if (!_contentLength.HasValue)
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{{
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_contentLength = ParseContentLength(value);
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return true;
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}}
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return false;" : $@"
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if ({header.TestNotBit()})
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{{
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{header.SetBit()};
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_headers._{header.Identifier} = value;{(header.EnhancedSetter == false ? "" : $@"
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_headers._raw{header.Identifier} = null;")}
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return true;
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}}
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return false;")}
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}}")}
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}}
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break;")}
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}}
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{(loop.ClassName == "FrameResponseHeaders" ? @"
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ValidateHeaderCharacters(key);" : "")}
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Unknown.Add(key, value);
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// Return true, above will throw and exit for false
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return true;
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}}
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protected override bool RemoveFast(string key)
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{{
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switch (key.Length)
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{{{Each(loop.HeadersByLength, byLength => $@"
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case {byLength.Key}:
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{{{Each(byLength, header => $@"
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if (""{header.Name}"".Equals(key, StringComparison.OrdinalIgnoreCase))
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{{{(header.Identifier == "ContentLength" ? @"
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if (_contentLength.HasValue)
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{
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_contentLength = null;
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return true;
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}
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return false;" : $@"
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if ({header.TestBit()})
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{{
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{header.ClearBit()};
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_headers._{header.Identifier} = default(StringValues);{(header.EnhancedSetter == false ? "" : $@"
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_headers._raw{header.Identifier} = null;")}
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return true;
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}}
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return false;")}
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}}")}
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}}
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break;")}
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}}
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return MaybeUnknown?.Remove(key) ?? false;
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}}
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protected override void ClearFast()
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{{
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MaybeUnknown?.Clear();
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_contentLength = null;
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var tempBits = _bits;
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_bits = 0;
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if(FrameHeaders.BitCount(tempBits) > 12)
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{{
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_headers = default(HeaderReferences);
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return;
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}}
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{Each(loop.Headers.Where(header => header.Identifier != "ContentLength").OrderBy(h => !h.PrimaryHeader), header => $@"
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if ({header.TestTempBit()})
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{{
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_headers._{header.Identifier} = default(StringValues);
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if({header.TestNotTempBit()})
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{{
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return;
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}}
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tempBits &= ~{1L << header.Index}L;
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}}
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")}
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}}
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protected override bool CopyToFast(KeyValuePair<string, StringValues>[] array, int arrayIndex)
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{{
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if (arrayIndex < 0)
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{{
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return false;
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}}
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{Each(loop.Headers.Where(header => header.Identifier != "ContentLength"), header => $@"
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if ({header.TestBit()})
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{{
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if (arrayIndex == array.Length)
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{{
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return false;
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}}
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array[arrayIndex] = new KeyValuePair<string, StringValues>(""{header.Name}"", _headers._{header.Identifier});
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++arrayIndex;
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}}")}
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if (_contentLength.HasValue)
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{{
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if (arrayIndex == array.Length)
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{{
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return false;
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}}
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array[arrayIndex] = new KeyValuePair<string, StringValues>(""Content-Length"", HeaderUtilities.FormatNonNegativeInt64(_contentLength.Value));
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++arrayIndex;
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}}
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((ICollection<KeyValuePair<string, StringValues>>)MaybeUnknown)?.CopyTo(array, arrayIndex);
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return true;
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}}
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{(loop.ClassName == "FrameResponseHeaders" ? $@"
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protected void CopyToFast(ref WritableBuffer output)
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{{
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var tempBits = _bits | (_contentLength.HasValue ? {1L << 63}L : 0);
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{Each(loop.Headers.Where(header => header.Identifier != "ContentLength").OrderBy(h => !h.PrimaryHeader), header => $@"
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if ({header.TestTempBit()})
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{{ {(header.EnhancedSetter == false ? "" : $@"
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if (_headers._raw{header.Identifier} != null)
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{{
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output.WriteFast(_headers._raw{header.Identifier});
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}}
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else ")}
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{{
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var valueCount = _headers._{header.Identifier}.Count;
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for (var i = 0; i < valueCount; i++)
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{{
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var value = _headers._{header.Identifier}[i];
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if (value != null)
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{{
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output.WriteFast(_headerBytes, {header.BytesOffset}, {header.BytesCount});
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output.WriteAsciiNoValidation(value);
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}}
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}}
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}}
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if({header.TestNotTempBit()})
|
|
{{
|
|
return;
|
|
}}
|
|
tempBits &= ~{1L << header.Index}L;
|
|
}}{(header.Identifier == "Server" ? $@"
|
|
if ((tempBits & {1L << 63}L) != 0)
|
|
{{
|
|
output.WriteFast(_headerBytes, {loop.Headers.First(x => x.Identifier == "ContentLength").BytesOffset}, {loop.Headers.First(x => x.Identifier == "ContentLength").BytesCount});
|
|
output.WriteNumeric((ulong)ContentLength.Value);
|
|
|
|
if((tempBits & ~{1L << 63}L) == 0)
|
|
{{
|
|
return;
|
|
}}
|
|
tempBits &= ~{1L << 63}L;
|
|
}}" : "")}")}
|
|
}}" : "")}
|
|
{(loop.ClassName == "FrameRequestHeaders" ? $@"
|
|
public unsafe void Append(byte* pKeyBytes, int keyLength, string value)
|
|
{{
|
|
var pUB = pKeyBytes;
|
|
{AppendSwitch(loop.Headers.Where(h => h.PrimaryHeader).GroupBy(x => x.Name.Length), loop.ClassName)}
|
|
|
|
AppendNonPrimaryHeaders(pKeyBytes, keyLength, value);
|
|
}}
|
|
|
|
private unsafe void AppendNonPrimaryHeaders(byte* pKeyBytes, int keyLength, string value)
|
|
{{
|
|
var pUB = pKeyBytes;
|
|
{AppendSwitch(loop.Headers.Where(h => !h.PrimaryHeader).GroupBy(x => x.Name.Length), loop.ClassName)}
|
|
|
|
AppendUnknownHeaders(pKeyBytes, keyLength, value);
|
|
}}" : "")}
|
|
|
|
private struct HeaderReferences
|
|
{{{Each(loop.Headers.Where(header => header.Identifier != "ContentLength"), header => @"
|
|
public StringValues _" + header.Identifier + ";")}
|
|
{Each(loop.Headers.Where(header => header.EnhancedSetter), header => @"
|
|
public byte[] _raw" + header.Identifier + ";")}
|
|
}}
|
|
|
|
public partial struct Enumerator
|
|
{{
|
|
public bool MoveNext()
|
|
{{
|
|
switch (_state)
|
|
{{
|
|
{Each(loop.Headers.Where(header => header.Identifier != "ContentLength"), header => $@"
|
|
case {header.Index}:
|
|
goto state{header.Index};
|
|
")}
|
|
case {loop.Headers.Count()}:
|
|
goto state{loop.Headers.Count()};
|
|
default:
|
|
goto state_default;
|
|
}}
|
|
{Each(loop.Headers.Where(header => header.Identifier != "ContentLength"), header => $@"
|
|
state{header.Index}:
|
|
if ({header.TestBit()})
|
|
{{
|
|
_current = new KeyValuePair<string, StringValues>(""{header.Name}"", _collection._headers._{header.Identifier});
|
|
_state = {header.Index + 1};
|
|
return true;
|
|
}}
|
|
")}
|
|
state{loop.Headers.Count()}:
|
|
if (_collection._contentLength.HasValue)
|
|
{{
|
|
_current = new KeyValuePair<string, StringValues>(""Content-Length"", HeaderUtilities.FormatNonNegativeInt64(_collection._contentLength.Value));
|
|
_state = {loop.Headers.Count() + 1};
|
|
return true;
|
|
}}
|
|
state_default:
|
|
if (!_hasUnknown || !_unknownEnumerator.MoveNext())
|
|
{{
|
|
_current = default(KeyValuePair<string, StringValues>);
|
|
return false;
|
|
}}
|
|
_current = _unknownEnumerator.Current;
|
|
return true;
|
|
}}
|
|
}}
|
|
}}
|
|
")}}}";
|
|
}
|
|
}
|
|
} |