mirror of
https://github.com/chylex/Brotli-Builder.git
synced 2024-10-17 12:42:47 +02:00
84 lines
4.1 KiB
C#
84 lines
4.1 KiB
C#
using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using BrotliLib.Brotli.Dictionary.Format;
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using BrotliLib.Brotli.Dictionary.Source;
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using BrotliLib.Brotli.Dictionary.Transform;
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namespace BrotliLib.Brotli.Dictionary.Default{
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/// <summary>
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/// Defines the format and transformations used for the default Brotli dictionary.
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/// https://tools.ietf.org/html/rfc7932#section-8
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/// https://tools.ietf.org/html/rfc7932#appendix-B
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/// </summary>
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public sealed class BrotliDefaultDictionary : BrotliDictionary{
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public static BrotliDefaultDictionary Embedded { get; }
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private static readonly IDictionaryFormat DefaultFormat = new BitDepthFormat(new int[]{
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0, 0, 0, 0, 10, 10, 11, 11, 10, 10, 10, 10, 10, 9, 9, 8, 7, 7, 8, 7, 7, 6, 6, 5, 5
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});
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private static readonly WordTransform[] DefaultTransforms;
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static BrotliDefaultDictionary(){
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Stream dict = typeof(BrotliDefaultDictionary).GetTypeInfo().Assembly.GetManifestResourceStream("BrotliLib.Brotli.Dictionary.Default.dict");
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StreamSource source = new StreamSource(dict);
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DefaultTransforms = Enumerable.Range(0, 121).Select(index => new WordTransform(PrefixMap[index], GetTransformType(index), SuffixMap[index])).ToArray();
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Embedded = new BrotliDefaultDictionary(source);
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}
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public BrotliDefaultDictionary(IDictionarySource source) : base(DefaultFormat, DefaultTransforms, source){}
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// Transforms
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private static readonly List<byte[]> PrefixMap = "~~ ~~~~ ~s ~~~~~~, ~~ ~~~e ~~~~~~~~~~~~ ~~.~ ~~~~~~~~ the ~~~~~~~~~~~ ~~~~~~~~~~ the ~~~ ~~.~~~~ ~.com/~ the ~~~~.~~~~ ~~ ~~ ~~~~ ~~ ~~~~~ ~~ ~~~~\xc2\xa0~ ~~~~~~ ~ ~ ~~~~ ~~ ~ ~ ~ "
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.Split('~').Select(Encoding.GetEncoding(28591).GetBytes).ToList(); // Latin1
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private static readonly List<byte[]> SuffixMap = "~ ~ ~~ ~ the ~~ ~ of ~~ and ~~~ ~, ~ ~ in ~ to ~ ~\"~.~\">~\n~~]~ for ~~~ a ~ that ~~. ~~, ~~ with ~\'~ from ~ by ~~~~~. The ~~ on ~ as ~ is ~~ing ~\n\t~:~. ~ed ~~~~(~, ~~ at ~ly ~ of ~~~, ~\"~(~ ~\">~=\"~.~~ of the ~\'~. This ~,~ ~(~.~ not ~=\"~er ~ ~al ~~=\'~\"~. ~(~ful ~. ~ive ~less ~\'~est ~.~\">~=\'~,~ize ~.~~,~=\"~=\"~ous ~, ~=\'~,~=\"~, ~,~(~. ~.~=\'~. ~=\"~=\'~=\'"
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.Split('~').Select(Encoding.GetEncoding(28591).GetBytes).ToList(); // Latin1
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private static readonly HashSet<int> IndFermentFirst = new HashSet<int>{
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4, 9, 15, 30, 58, 65, 66, 69, 74, 78, 79, 88, 91, 96, 99, 104, 108, 109, 118, 120
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};
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private static readonly HashSet<int> IndFermentAll = new HashSet<int>{
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44, 68, 83, 85, 87, 94, 97, 101, 105, 107, 110, 111, 112, 113, 114, 115, 116, 117, 119
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};
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private static TransformType GetTransformType(int index){
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if (IndFermentFirst.Contains(index)){
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return TransformType.FermentFirst;
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}
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if (IndFermentAll.Contains(index)){
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return TransformType.FermentAll;
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}
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return index switch{
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3 => TransformType.OmitFirstN + 1,
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11 => TransformType.OmitFirstN + 2,
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12 => TransformType.OmitLastN + 1,
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23 => TransformType.OmitLastN + 3,
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26 => TransformType.OmitFirstN + 3,
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27 => TransformType.OmitLastN + 2,
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34 => TransformType.OmitFirstN + 4,
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39 => TransformType.OmitFirstN + 5,
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40 => TransformType.OmitFirstN + 6,
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42 => TransformType.OmitLastN + 4,
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48 => TransformType.OmitLastN + 7,
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49 => TransformType.OmitLastN + 1,
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54 => TransformType.OmitFirstN + 9,
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55 => TransformType.OmitFirstN + 7,
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56 => TransformType.OmitLastN + 6,
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59 => TransformType.OmitLastN + 8,
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63 => TransformType.OmitLastN + 5,
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64 => TransformType.OmitLastN + 9,
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_ => TransformType.Identity,
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};
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}
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}
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}
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