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https://github.com/LadybirdBrowser/ladybird.git
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253 lines
16 KiB
C++
253 lines
16 KiB
C++
/*
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* Copyright (c) 2022, Michiel Visser <opensource@webmichiel.nl>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Types.h>
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#include <LibCompress/BrotliDictionary.h>
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// Include the 119.9 KiB of dictionary data from a binary file
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extern u8 const brotli_dictionary_data[];
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#if defined(AK_OS_MACOS)
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asm(".const_data\n"
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".globl _brotli_dictionary_data\n"
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"_brotli_dictionary_data:\n");
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#elif defined(AK_OS_EMSCRIPTEN)
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asm(".section .data, \"\",@\n"
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".global brotli_dictionary_data\n"
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"brotli_dictionary_data:\n");
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#else
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asm(".section .rodata\n"
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".global brotli_dictionary_data\n"
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"brotli_dictionary_data:\n");
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#endif
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asm(".incbin \"LibCompress/BrotliDictionaryData.bin\"\n"
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#if (!defined(AK_OS_WINDOWS) && !defined(AK_OS_EMSCRIPTEN))
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".previous\n");
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#else
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);
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#endif
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namespace Compress {
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static size_t const bits_by_length[25] {
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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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static size_t const offset_by_length[25] {
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0, 0, 0, 0, 0, 4096, 9216, 21504, 35840, 44032, 53248, 63488, 74752, 87040, 93696, 100864,
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104704, 106752, 108928, 113536, 115968, 118528, 119872, 121280, 122016
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};
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static int ferment(Bytes word, size_t pos)
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{
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if (word[pos] < 192) {
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if (word[pos] >= 97 && word[pos] <= 122) {
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word[pos] = word[pos] ^ 32;
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}
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return 1;
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} else if (word[pos] < 224) {
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if (pos + 1 < word.size()) {
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word[pos + 1] = word[pos + 1] ^ 32;
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}
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return 2;
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} else {
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if (pos + 2 < word.size()) {
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word[pos + 2] = word[pos + 2] ^ 5;
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}
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return 3;
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}
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}
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static void ferment_first(Bytes word)
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{
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if (word.size() > 0) {
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ferment(word, 0);
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}
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}
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[[maybe_unused]] static void ferment_all(Bytes word)
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{
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size_t i = 0;
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while (i < word.size()) {
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i += ferment(word, i);
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}
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}
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using BrotliDictionary::TransformationOperation::FermentAll;
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using BrotliDictionary::TransformationOperation::FermentFirst;
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using BrotliDictionary::TransformationOperation::Identity;
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using BrotliDictionary::TransformationOperation::OmitFirst;
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using BrotliDictionary::TransformationOperation::OmitLast;
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constexpr static BrotliDictionary::Transformation transformations[121] {
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// ID Prefix Transform Suffix
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// -- ------ --------- ------
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{ ""sv, Identity, 0, ""sv }, // 0 "" Identity ""
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{ ""sv, Identity, 0, " "sv }, // 1 "" Identity " "
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{ " "sv, Identity, 0, " "sv }, // 2 " " Identity " "
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{ ""sv, OmitFirst, 1, ""sv }, // 3 "" OmitFirst1 ""
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{ ""sv, FermentFirst, 0, " "sv }, // 4 "" FermentFirst " "
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{ ""sv, Identity, 0, " the "sv }, // 5 "" Identity " the "
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{ " "sv, Identity, 0, ""sv }, // 6 " " Identity ""
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{ "s "sv, Identity, 0, " "sv }, // 7 "s " Identity " "
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{ ""sv, Identity, 0, " of "sv }, // 8 "" Identity " of "
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{ ""sv, FermentFirst, 0, ""sv }, // 9 "" FermentFirst ""
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{ ""sv, Identity, 0, " and "sv }, // 10 "" Identity " and "
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{ ""sv, OmitFirst, 2, ""sv }, // 11 "" OmitFirst2 ""
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{ ""sv, OmitLast, 1, ""sv }, // 12 "" OmitLast1 ""
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{ ", "sv, Identity, 0, " "sv }, // 13 ", " Identity " "
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{ ""sv, Identity, 0, ", "sv }, // 14 "" Identity ", "
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{ " "sv, FermentFirst, 0, " "sv }, // 15 " " FermentFirst " "
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{ ""sv, Identity, 0, " in "sv }, // 16 "" Identity " in "
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{ ""sv, Identity, 0, " to "sv }, // 17 "" Identity " to "
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{ "e "sv, Identity, 0, " "sv }, // 18 "e " Identity " "
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{ ""sv, Identity, 0, "\""sv }, // 19 "" Identity "\""
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{ ""sv, Identity, 0, "."sv }, // 20 "" Identity "."
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{ ""sv, Identity, 0, "\">"sv }, // 21 "" Identity "\">"
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{ ""sv, Identity, 0, "\n"sv }, // 22 "" Identity "\n"
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{ ""sv, OmitLast, 3, ""sv }, // 23 "" OmitLast3 ""
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{ ""sv, Identity, 0, "]"sv }, // 24 "" Identity "]"
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{ ""sv, Identity, 0, " for "sv }, // 25 "" Identity " for "
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{ ""sv, OmitFirst, 3, ""sv }, // 26 "" OmitFirst3 ""
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{ ""sv, OmitLast, 2, ""sv }, // 27 "" OmitLast2 ""
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{ ""sv, Identity, 0, " a "sv }, // 28 "" Identity " a "
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{ ""sv, Identity, 0, " that "sv }, // 29 "" Identity " that "
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{ " "sv, FermentFirst, 0, ""sv }, // 30 " " FermentFirst ""
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{ ""sv, Identity, 0, ". "sv }, // 31 "" Identity ". "
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{ "."sv, Identity, 0, ""sv }, // 32 "." Identity ""
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{ " "sv, Identity, 0, ", "sv }, // 33 " " Identity ", "
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{ ""sv, OmitFirst, 4, ""sv }, // 34 "" OmitFirst4 ""
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{ ""sv, Identity, 0, " with "sv }, // 35 "" Identity " with "
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{ ""sv, Identity, 0, "'"sv }, // 36 "" Identity "'"
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{ ""sv, Identity, 0, " from "sv }, // 37 "" Identity " from "
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{ ""sv, Identity, 0, " by "sv }, // 38 "" Identity " by "
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{ ""sv, OmitFirst, 5, ""sv }, // 39 "" OmitFirst5 ""
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{ ""sv, OmitFirst, 6, ""sv }, // 40 "" OmitFirst6 ""
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{ " the "sv, Identity, 0, ""sv }, // 41 " the " Identity ""
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{ ""sv, OmitLast, 4, ""sv }, // 42 "" OmitLast4 ""
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{ ""sv, Identity, 0, ". The "sv }, // 43 "" Identity ". The "
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{ ""sv, FermentAll, 0, ""sv }, // 44 "" FermentAll ""
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{ ""sv, Identity, 0, " on "sv }, // 45 "" Identity " on "
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{ ""sv, Identity, 0, " as "sv }, // 46 "" Identity " as "
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{ ""sv, Identity, 0, " is "sv }, // 47 "" Identity " is "
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{ ""sv, OmitLast, 7, ""sv }, // 48 "" OmitLast7 ""
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{ ""sv, OmitLast, 1, "ing "sv }, // 49 "" OmitLast1 "ing "
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{ ""sv, Identity, 0, "\n\t"sv }, // 50 "" Identity "\n\t"
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{ ""sv, Identity, 0, ":"sv }, // 51 "" Identity ":"
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{ " "sv, Identity, 0, ". "sv }, // 52 " " Identity ". "
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{ ""sv, Identity, 0, "ed "sv }, // 53 "" Identity "ed "
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{ ""sv, OmitFirst, 9, ""sv }, // 54 "" OmitFirst9 ""
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{ ""sv, OmitFirst, 7, ""sv }, // 55 "" OmitFirst7 ""
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{ ""sv, OmitLast, 6, ""sv }, // 56 "" OmitLast6 ""
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{ ""sv, Identity, 0, "("sv }, // 57 "" Identity "("
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{ ""sv, FermentFirst, 0, ", "sv }, // 58 "" FermentFirst ", "
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{ ""sv, OmitLast, 8, ""sv }, // 59 "" OmitLast8 ""
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{ ""sv, Identity, 0, " at "sv }, // 60 "" Identity " at "
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{ ""sv, Identity, 0, "ly "sv }, // 61 "" Identity "ly "
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{ " the "sv, Identity, 0, " of "sv }, // 62 " the " Identity " of "
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{ ""sv, OmitLast, 5, ""sv }, // 63 "" OmitLast5 ""
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{ ""sv, OmitLast, 9, ""sv }, // 64 "" OmitLast9 ""
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{ " "sv, FermentFirst, 0, ", "sv }, // 65 " " FermentFirst ", "
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{ ""sv, FermentFirst, 0, "\""sv }, // 66 "" FermentFirst "\""
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{ "."sv, Identity, 0, "("sv }, // 67 "." Identity "("
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{ ""sv, FermentAll, 0, " "sv }, // 68 "" FermentAll " "
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{ ""sv, FermentFirst, 0, "\">"sv }, // 69 "" FermentFirst "\">"
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{ ""sv, Identity, 0, "=\""sv }, // 70 "" Identity "=\""
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{ " "sv, Identity, 0, "."sv }, // 71 " " Identity "."
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{ ".com/"sv, Identity, 0, ""sv }, // 72 ".com/" Identity ""
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{ " the "sv, Identity, 0, " of the "sv }, // 73 " the " Identity " of the "
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{ ""sv, FermentFirst, 0, "'"sv }, // 74 "" FermentFirst "'"
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{ ""sv, Identity, 0, ". This "sv }, // 75 "" Identity ". This "
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{ ""sv, Identity, 0, ","sv }, // 76 "" Identity ","
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{ "."sv, Identity, 0, " "sv }, // 77 "." Identity " "
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{ ""sv, FermentFirst, 0, "("sv }, // 78 "" FermentFirst "("
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{ ""sv, FermentFirst, 0, "."sv }, // 79 "" FermentFirst "."
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{ ""sv, Identity, 0, " not "sv }, // 80 "" Identity " not "
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{ " "sv, Identity, 0, "=\""sv }, // 81 " " Identity "=\""
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{ ""sv, Identity, 0, "er "sv }, // 82 "" Identity "er "
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{ " "sv, FermentAll, 0, " "sv }, // 83 " " FermentAll " "
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{ ""sv, Identity, 0, "al "sv }, // 84 "" Identity "al "
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{ " "sv, FermentAll, 0, ""sv }, // 85 " " FermentAll ""
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{ ""sv, Identity, 0, "='"sv }, // 86 "" Identity "='"
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{ ""sv, FermentAll, 0, "\""sv }, // 87 "" FermentAll "\""
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{ ""sv, FermentFirst, 0, ". "sv }, // 88 "" FermentFirst ". "
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{ " "sv, Identity, 0, "("sv }, // 89 " " Identity "("
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{ ""sv, Identity, 0, "ful "sv }, // 90 "" Identity "ful "
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{ " "sv, FermentFirst, 0, ". "sv }, // 91 " " FermentFirst ". "
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{ ""sv, Identity, 0, "ive "sv }, // 92 "" Identity "ive "
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{ ""sv, Identity, 0, "less "sv }, // 93 "" Identity "less "
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{ ""sv, FermentAll, 0, "'"sv }, // 94 "" FermentAll "'"
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{ ""sv, Identity, 0, "est "sv }, // 95 "" Identity "est "
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{ " "sv, FermentFirst, 0, "."sv }, // 96 " " FermentFirst "."
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{ ""sv, FermentAll, 0, "\">"sv }, // 97 "" FermentAll "\">"
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{ " "sv, Identity, 0, "='"sv }, // 98 " " Identity "='"
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{ ""sv, FermentFirst, 0, ","sv }, // 99 "" FermentFirst ","
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{ ""sv, Identity, 0, "ize "sv }, // 100 "" Identity "ize "
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{ ""sv, FermentAll, 0, "."sv }, // 101 "" FermentAll "."
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{ "\xc2\xa0"sv, Identity, 0, ""sv }, // 102 "\xc2\xa0" Identity ""
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{ " "sv, Identity, 0, ","sv }, // 103 " " Identity ","
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{ ""sv, FermentFirst, 0, "=\""sv }, // 104 "" FermentFirst "=\""
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{ ""sv, FermentAll, 0, "=\""sv }, // 105 "" FermentAll "=\""
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{ ""sv, Identity, 0, "ous "sv }, // 106 "" Identity "ous "
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{ ""sv, FermentAll, 0, ", "sv }, // 107 "" FermentAll ", "
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{ ""sv, FermentFirst, 0, "='"sv }, // 108 "" FermentFirst "='"
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{ " "sv, FermentFirst, 0, ","sv }, // 109 " " FermentFirst ","
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{ " "sv, FermentAll, 0, "=\""sv }, // 110 " " FermentAll "=\""
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{ " "sv, FermentAll, 0, ", "sv }, // 111 " " FermentAll ", "
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{ ""sv, FermentAll, 0, ","sv }, // 112 "" FermentAll ","
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{ ""sv, FermentAll, 0, "("sv }, // 113 "" FermentAll "("
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{ ""sv, FermentAll, 0, ". "sv }, // 114 "" FermentAll ". "
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{ " "sv, FermentAll, 0, "."sv }, // 115 " " FermentAll "."
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{ ""sv, FermentAll, 0, "='"sv }, // 116 "" FermentAll "='"
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{ " "sv, FermentAll, 0, ". "sv }, // 117 " " FermentAll ". "
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{ " "sv, FermentFirst, 0, "=\""sv }, // 118 " " FermentFirst "=\""
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{ " "sv, FermentAll, 0, "='"sv }, // 119 " " FermentAll "='"
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{ " "sv, FermentFirst, 0, "='"sv }, // 120 " " FermentFirst "='"
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};
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ErrorOr<ByteBuffer> BrotliDictionary::lookup_word(size_t index, size_t length)
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{
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if (length < 4 || length > 24)
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return Error::from_string_literal("invalid dictionary lookup length");
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size_t word_index = index % (1 << bits_by_length[length]);
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ReadonlyBytes base_word { brotli_dictionary_data + offset_by_length[length] + (word_index * length), length };
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size_t transform_id = index >> bits_by_length[length];
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if (transform_id >= 121)
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return Error::from_string_literal("invalid dictionary transformation");
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auto transformation = transformations[transform_id];
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ByteBuffer bb;
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bb.append(transformation.prefix.bytes());
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size_t prefix_length = bb.size();
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switch (transformation.operation) {
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case TransformationOperation::Identity:
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bb.append(base_word);
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break;
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case TransformationOperation::FermentFirst:
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bb.append(base_word);
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ferment_first(bb.bytes().slice(prefix_length));
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break;
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case TransformationOperation::FermentAll:
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bb.append(base_word);
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ferment_all(bb.bytes().slice(prefix_length));
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break;
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case TransformationOperation::OmitFirst:
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if (transformation.operation_data < base_word.size())
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bb.append(base_word.slice(transformation.operation_data));
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break;
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case TransformationOperation::OmitLast:
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if (transformation.operation_data < base_word.size())
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bb.append(base_word.slice(0, base_word.size() - transformation.operation_data));
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break;
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}
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bb.append(transformation.suffix.bytes());
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return bb;
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}
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}
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