/* * Copyright (c) 2020, Andreas Kling * Copyright (c) 2022, Jelle Raaijmakers * Copyright (c) 2023, Sam Atkins * Copyright (c) 2024, Simon Wanner * * SPDX-License-Identifier: BSD-2-Clause */ #include #include #include #include #include #include namespace TextCodec { static constexpr u32 replacement_code_point = 0xfffd; namespace { Latin1Decoder s_latin1_decoder; UTF8Decoder s_utf8_decoder; UTF16BEDecoder s_utf16be_decoder; UTF16LEDecoder s_utf16le_decoder; PDFDocEncodingDecoder s_pdf_doc_encoding_decoder; XUserDefinedDecoder s_x_user_defined_decoder; GB18030Decoder s_gb18030_decoder; Big5Decoder s_big5_decoder; EUCJPDecoder s_euc_jp_decoder; ISO2022JPDecoder s_iso_2022_jp_decoder; ShiftJISDecoder s_shift_jis_decoder; EUCKRDecoder s_euc_kr_decoder; ReplacementDecoder s_replacement_decoder; // s_{encoding}_index is generated from https://encoding.spec.whatwg.org/indexes.json // Found separately in https://encoding.spec.whatwg.org/index-{encoding}.txt SingleByteDecoder s_ibm866_decoder { s_ibm866_index }; SingleByteDecoder s_latin2_decoder { s_iso_8859_2_index }; SingleByteDecoder s_latin3_decoder { s_iso_8859_3_index }; SingleByteDecoder s_latin4_decoder { s_iso_8859_4_index }; SingleByteDecoder s_latin_cyrillic_decoder { s_iso_8859_5_index }; SingleByteDecoder s_latin_arabic_decoder { s_iso_8859_6_index }; SingleByteDecoder s_latin_greek_decoder { s_iso_8859_7_index }; SingleByteDecoder s_latin_hebrew_decoder { s_iso_8859_8_index }; SingleByteDecoder s_latin6_decoder { s_iso_8859_10_index }; SingleByteDecoder s_latin7_decoder { s_iso_8859_13_index }; SingleByteDecoder s_latin8_decoder { s_iso_8859_14_index }; SingleByteDecoder s_latin9_decoder { s_iso_8859_15_index }; SingleByteDecoder s_latin10_decoder { s_iso_8859_16_index }; SingleByteDecoder s_centraleurope_decoder { s_windows_1250_index }; SingleByteDecoder s_cyrillic_decoder { s_windows_1251_index }; SingleByteDecoder s_hebrew_decoder { s_windows_1255_index }; SingleByteDecoder s_koi8r_decoder { s_koi8_r_index }; SingleByteDecoder s_koi8u_decoder { s_koi8_u_index }; SingleByteDecoder s_mac_roman_decoder { s_macintosh_index }; SingleByteDecoder s_windows874_decoder { s_windows_874_index }; SingleByteDecoder s_windows1252_decoder { s_windows_1252_index }; SingleByteDecoder s_windows1253_decoder { s_windows_1253_index }; SingleByteDecoder s_turkish_decoder { s_windows_1254_index }; SingleByteDecoder s_windows1256_decoder { s_windows_1256_index }; SingleByteDecoder s_windows1257_decoder { s_windows_1257_index }; SingleByteDecoder s_windows1258_decoder { s_windows_1258_index }; SingleByteDecoder s_mac_cyrillic_decoder { s_x_mac_cyrillic_index }; } Optional decoder_for(StringView label) { auto encoding = get_standardized_encoding(label); return encoding.has_value() ? decoder_for_exact_name(encoding.value()) : Optional {}; } Optional decoder_for_exact_name(StringView encoding) { if (encoding.equals_ignoring_ascii_case("iso-8859-1"sv)) return s_latin1_decoder; if (encoding.equals_ignoring_ascii_case("windows-1252"sv)) return s_windows1252_decoder; if (encoding.equals_ignoring_ascii_case("utf-8"sv)) return s_utf8_decoder; if (encoding.equals_ignoring_ascii_case("utf-16be"sv)) return s_utf16be_decoder; if (encoding.equals_ignoring_ascii_case("utf-16le"sv)) return s_utf16le_decoder; if (encoding.equals_ignoring_ascii_case("big5"sv)) return s_big5_decoder; if (encoding.equals_ignoring_ascii_case("euc-jp"sv)) return s_euc_jp_decoder; if (encoding.equals_ignoring_ascii_case("euc-kr"sv)) return s_euc_kr_decoder; if (encoding.equals_ignoring_ascii_case("gbk"sv)) return s_gb18030_decoder; if (encoding.equals_ignoring_ascii_case("gb18030"sv)) return s_gb18030_decoder; if (encoding.equals_ignoring_ascii_case("ibm866"sv)) return s_ibm866_decoder; if (encoding.equals_ignoring_ascii_case("iso-2022-jp"sv)) return s_iso_2022_jp_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-2"sv)) return s_latin2_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-3"sv)) return s_latin3_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-4"sv)) return s_latin4_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-5"sv)) return s_latin_cyrillic_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-6"sv)) return s_latin_arabic_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-7"sv)) return s_latin_greek_decoder; if (encoding.is_one_of_ignoring_ascii_case("iso-8859-8"sv, "iso-8859-8-i"sv)) return s_latin_hebrew_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-10"sv)) return s_latin6_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-13"sv)) return s_latin7_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-14"sv)) return s_latin8_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-15"sv)) return s_latin9_decoder; if (encoding.equals_ignoring_ascii_case("iso-8859-16"sv)) return s_latin10_decoder; if (encoding.equals_ignoring_ascii_case("koi8-r"sv)) return s_koi8r_decoder; if (encoding.equals_ignoring_ascii_case("koi8-u"sv)) return s_koi8u_decoder; if (encoding.equals_ignoring_ascii_case("macintosh"sv)) return s_mac_roman_decoder; if (encoding.equals_ignoring_ascii_case("PDFDocEncoding"sv)) return s_pdf_doc_encoding_decoder; if (encoding.equals_ignoring_ascii_case("replacement"sv)) return s_replacement_decoder; if (encoding.equals_ignoring_ascii_case("shift_jis"sv)) return s_shift_jis_decoder; if (encoding.equals_ignoring_ascii_case("windows-874"sv)) return s_windows874_decoder; if (encoding.equals_ignoring_ascii_case("windows-1250"sv)) return s_centraleurope_decoder; if (encoding.equals_ignoring_ascii_case("windows-1251"sv)) return s_cyrillic_decoder; if (encoding.equals_ignoring_ascii_case("windows-1253"sv)) return s_windows1253_decoder; if (encoding.equals_ignoring_ascii_case("windows-1254"sv)) return s_turkish_decoder; if (encoding.equals_ignoring_ascii_case("windows-1255"sv)) return s_hebrew_decoder; if (encoding.equals_ignoring_ascii_case("windows-1256"sv)) return s_windows1256_decoder; if (encoding.equals_ignoring_ascii_case("windows-1257"sv)) return s_windows1257_decoder; if (encoding.equals_ignoring_ascii_case("windows-1258"sv)) return s_windows1258_decoder; if (encoding.equals_ignoring_ascii_case("x-mac-cyrillic"sv)) return s_mac_cyrillic_decoder; if (encoding.equals_ignoring_ascii_case("x-user-defined"sv)) return s_x_user_defined_decoder; dbgln("TextCodec: No decoder implemented for encoding '{}'", encoding); return {}; } // https://encoding.spec.whatwg.org/#concept-encoding-get Optional get_standardized_encoding(StringView encoding) { // 1. Remove any leading and trailing ASCII whitespace from label. // https://infra.spec.whatwg.org/#ascii-whitespace: ASCII whitespace is U+0009 TAB, U+000A LF, U+000C FF, U+000D CR, or U+0020 SPACE. encoding = encoding.trim("\t\n\f\r "sv); // 2. If label is an ASCII case-insensitive match for any of the labels listed in the table below, then return the corresponding encoding; otherwise return failure. if (encoding.is_one_of_ignoring_ascii_case("unicode-1-1-utf-8"sv, "unicode11utf8"sv, "unicode20utf8"sv, "utf-8"sv, "utf8"sv, "x-unicode20utf8"sv)) return "UTF-8"sv; if (encoding.is_one_of_ignoring_ascii_case("866"sv, "cp866"sv, "csibm866"sv, "ibm866"sv)) return "IBM866"sv; if (encoding.is_one_of_ignoring_ascii_case("csisolatin2"sv, "iso-8859-2"sv, "iso-ir-101"sv, "iso8859-2"sv, "iso88592"sv, "iso_8859-2"sv, "iso_8859-2:1987"sv, "l2"sv, "latin2"sv)) return "ISO-8859-2"sv; if (encoding.is_one_of_ignoring_ascii_case("csisolatin3"sv, "iso-8859-3"sv, "iso-ir-109"sv, "iso8859-3"sv, "iso88593"sv, "iso_8859-3"sv, "iso_8859-3:1988"sv, "l3"sv, "latin3"sv)) return "ISO-8859-3"sv; if (encoding.is_one_of_ignoring_ascii_case("csisolatin4"sv, "iso-8859-4"sv, "iso-ir-110"sv, "iso8859-4"sv, "iso88594"sv, "iso_8859-4"sv, "iso_8859-4:1988"sv, "l4"sv, "latin4"sv)) return "ISO-8859-4"sv; if (encoding.is_one_of_ignoring_ascii_case("csisolatincyrillic"sv, "cyrillic"sv, "iso-8859-5"sv, "iso-ir-144"sv, "iso8859-5"sv, "iso88595"sv, "iso_8859-5"sv, "iso_8859-5:1988"sv)) return "ISO-8859-5"sv; if (encoding.is_one_of_ignoring_ascii_case("arabic"sv, "asmo-708"sv, "csiso88596e"sv, "csiso88596i"sv, "csisolatinarabic"sv, "ecma-114"sv, "iso-8859-6"sv, "iso-8859-6-e"sv, "iso-8859-6-i"sv, "iso-ir-127"sv, "iso8859-6"sv, "iso88596"sv, "iso_8859-6"sv, "iso_8859-6:1987"sv)) return "ISO-8859-6"sv; if (encoding.is_one_of_ignoring_ascii_case("csisolatingreek"sv, "ecma-118"sv, "elot_928"sv, "greek"sv, "greek8"sv, "iso-8859-7"sv, "iso-ir-126"sv, "iso8859-7"sv, "iso88597"sv, "iso_8859-7"sv, "iso_8859-7:1987"sv, "sun_eu_greek"sv)) return "ISO-8859-7"sv; if (encoding.is_one_of_ignoring_ascii_case("csiso88598e"sv, "csisolatinhebrew"sv, "hebrew"sv, "iso-8859-8"sv, "iso-8859-8-e"sv, "iso-ir-138"sv, "iso8859-8"sv, "iso88598"sv, "iso_8859-8"sv, "iso_8859-8:1988"sv, "visual"sv)) return "ISO-8859-8"sv; if (encoding.is_one_of_ignoring_ascii_case("csiso88598i"sv, "iso-8859-8-i"sv, "logical"sv)) return "ISO-8859-8-I"sv; if (encoding.is_one_of_ignoring_ascii_case("csisolatin6"sv, "iso-8859-10"sv, "iso-ir-157"sv, "iso8859-10"sv, "iso885910"sv, "l6"sv, "latin6"sv)) return "ISO-8859-10"sv; if (encoding.is_one_of_ignoring_ascii_case("iso-8859-13"sv, "iso8859-13"sv, "iso885913"sv)) return "ISO-8859-13"sv; if (encoding.is_one_of_ignoring_ascii_case("iso-8859-14"sv, "iso8859-14"sv, "iso885914"sv)) return "ISO-8859-14"sv; if (encoding.is_one_of_ignoring_ascii_case("csisolatin9"sv, "iso-8859-15"sv, "iso8859-15"sv, "iso885915"sv, "iso_8859-15"sv, "l9"sv)) return "ISO-8859-15"sv; if (encoding.is_one_of_ignoring_ascii_case("iso-8859-16"sv)) return "ISO-8859-16"sv; if (encoding.is_one_of_ignoring_ascii_case("cskoi8r"sv, "koi"sv, "koi8"sv, "koi8-r"sv, "koi8_r"sv)) return "KOI8-R"sv; if (encoding.is_one_of_ignoring_ascii_case("koi8-ru"sv, "koi8-u"sv)) return "KOI8-U"sv; if (encoding.is_one_of_ignoring_ascii_case("csmacintosh"sv, "mac"sv, "macintosh"sv, "x-mac-roman"sv)) return "macintosh"sv; if (encoding.is_one_of_ignoring_ascii_case("pdfdocencoding"sv)) return "PDFDocEncoding"sv; if (encoding.is_one_of_ignoring_ascii_case("dos-874"sv, "iso-8859-11"sv, "iso8859-11"sv, "iso885911"sv, "tis-620"sv, "windows-874"sv)) return "windows-874"sv; if (encoding.is_one_of_ignoring_ascii_case("cp1250"sv, "windows-1250"sv, "x-cp1250"sv)) return "windows-1250"sv; if (encoding.is_one_of_ignoring_ascii_case("cp1251"sv, "windows-1251"sv, "x-cp1251"sv)) return "windows-1251"sv; if (encoding.is_one_of_ignoring_ascii_case("ansi_x3.4-1968"sv, "ascii"sv, "cp1252"sv, "cp819"sv, "csisolatin1"sv, "ibm819"sv, "iso-8859-1"sv, "iso-ir-100"sv, "iso8859-1"sv, "iso88591"sv, "iso_8859-1"sv, "iso_8859-1:1987"sv, "l1"sv, "latin1"sv, "us-ascii"sv, "windows-1252"sv, "x-cp1252"sv)) return "windows-1252"sv; if (encoding.is_one_of_ignoring_ascii_case("cp1253"sv, "windows-1253"sv, "x-cp1253"sv)) return "windows-1253"sv; if (encoding.is_one_of_ignoring_ascii_case("cp1254"sv, "csisolatin5"sv, "iso-8859-9"sv, "iso-ir-148"sv, "iso8859-9"sv, "iso88599"sv, "iso_8859-9"sv, "iso_8859-9:1989"sv, "l5"sv, "latin5"sv, "windows-1254"sv, "x-cp1254"sv)) return "windows-1254"sv; if (encoding.is_one_of_ignoring_ascii_case("cp1255"sv, "windows-1255"sv, "x-cp1255"sv)) return "windows-1255"sv; if (encoding.is_one_of_ignoring_ascii_case("cp1256"sv, "windows-1256"sv, "x-cp1256"sv)) return "windows-1256"sv; if (encoding.is_one_of_ignoring_ascii_case("cp1257"sv, "windows-1257"sv, "x-cp1257"sv)) return "windows-1257"sv; if (encoding.is_one_of_ignoring_ascii_case("cp1258"sv, "windows-1258"sv, "x-cp1258"sv)) return "windows-1258"sv; if (encoding.is_one_of_ignoring_ascii_case("x-mac-cyrillic"sv, "x-mac-ukrainian"sv)) return "x-mac-cyrillic"sv; if (encoding.is_one_of_ignoring_ascii_case("koi8-r"sv, "koi8r"sv)) return "koi8-r"sv; if (encoding.is_one_of_ignoring_ascii_case("chinese"sv, "csgb2312"sv, "csiso58gb231280"sv, "gb2312"sv, "gb_2312"sv, "gb_2312-80"sv, "gbk"sv, "iso-ir-58"sv, "x-gbk"sv)) return "GBK"sv; if (encoding.is_one_of_ignoring_ascii_case("gb18030"sv)) return "gb18030"sv; if (encoding.is_one_of_ignoring_ascii_case("big5"sv, "big5-hkscs"sv, "cn-big5"sv, "csbig5"sv, "x-x-big5"sv)) return "Big5"sv; if (encoding.is_one_of_ignoring_ascii_case("cseucpkdfmtjapanese"sv, "euc-jp"sv, "x-euc-jp"sv)) return "EUC-JP"sv; if (encoding.is_one_of_ignoring_ascii_case("csiso2022jp"sv, "iso-2022-jp"sv)) return "ISO-2022-JP"sv; if (encoding.is_one_of_ignoring_ascii_case("csshiftjis"sv, "ms932"sv, "ms_kanji"sv, "shift-jis"sv, "shift_jis"sv, "sjis"sv, "windows-31j"sv, "x-sjis"sv)) return "Shift_JIS"sv; if (encoding.is_one_of_ignoring_ascii_case("cseuckr"sv, "csksc56011987"sv, "euc-kr"sv, "iso-ir-149"sv, "korean"sv, "ks_c_5601-1987"sv, "ks_c_5601-1989"sv, "ksc5601"sv, "ksc_5601"sv, "windows-949"sv)) return "EUC-KR"sv; if (encoding.is_one_of_ignoring_ascii_case("csiso2022kr"sv, "hz-gb-2312"sv, "iso-2022-cn"sv, "iso-2022-cn-ext"sv, "iso-2022-kr"sv, "replacement"sv)) return "replacement"sv; if (encoding.is_one_of_ignoring_ascii_case("unicodefffe"sv, "utf-16be"sv)) return "UTF-16BE"sv; if (encoding.is_one_of_ignoring_ascii_case("csunicode"sv, "iso-10646-ucs-2"sv, "ucs-2"sv, "unicode"sv, "unicodefeff"sv, "utf-16"sv, "utf-16le"sv)) return "UTF-16LE"sv; if (encoding.is_one_of_ignoring_ascii_case("x-user-defined"sv)) return "x-user-defined"sv; dbgln("TextCodec: Unrecognized encoding: {}", encoding); return {}; } // https://encoding.spec.whatwg.org/#bom-sniff Optional bom_sniff_to_decoder(StringView input) { // 1. Let BOM be the result of peeking 3 bytes from ioQueue, converted to a byte sequence. // 2. For each of the rows in the table below, starting with the first one and going down, // if BOM starts with the bytes given in the first column, then return the encoding given // in the cell in the second column of that row. Otherwise, return null. // Byte Order Mark | Encoding // -------------------------- // 0xEF 0xBB 0xBF | UTF-8 // 0xFE 0xFF | UTF-16BE // 0xFF 0xFE | UTF-16LE auto bytes = input.bytes(); if (bytes.size() < 2) return {}; auto first_byte = bytes[0]; switch (first_byte) { case 0xEF: // UTF-8 if (bytes.size() < 3) return {}; if (bytes[1] == 0xBB && bytes[2] == 0xBF) return s_utf8_decoder; return {}; case 0xFE: // UTF-16BE if (bytes[1] == 0xFF) return s_utf16be_decoder; return {}; case 0xFF: // UTF-16LE if (bytes[1] == 0xFE) return s_utf16le_decoder; return {}; } return {}; } // https://encoding.spec.whatwg.org/#decode ErrorOr convert_input_to_utf8_using_given_decoder_unless_there_is_a_byte_order_mark(Decoder& fallback_decoder, StringView input) { Decoder* actual_decoder = &fallback_decoder; // 1. Let BOMEncoding be the result of BOM sniffing ioQueue. // 2. If BOMEncoding is non-null: if (auto unicode_decoder = bom_sniff_to_decoder(input); unicode_decoder.has_value()) { // 1. Set encoding to BOMEncoding. actual_decoder = &unicode_decoder.value(); // 2. Read three bytes from ioQueue, if BOMEncoding is UTF-8; otherwise read two bytes. (Do nothing with those bytes.) // FIXME: I imagine this will be pretty slow for large inputs, as it's regenerating the input without the first 2/3 bytes. input = input.substring_view(&unicode_decoder.value() == &s_utf8_decoder ? 3 : 2); } VERIFY(actual_decoder); // 3. Process a queue with an instance of encoding’s decoder, ioQueue, output, and "replacement". // FIXME: This isn't the exact same as the spec, which is written in terms of I/O queues. auto output = TRY(actual_decoder->to_utf8(input)); // 4. Return output. return output; } // https://encoding.spec.whatwg.org/#get-an-output-encoding StringView get_output_encoding(StringView encoding) { // 1. If encoding is replacement or UTF-16BE/LE, then return UTF-8. if (encoding.is_one_of_ignoring_ascii_case("replacement"sv, "utf-16le"sv, "utf-16be"sv)) return "UTF-8"sv; // 2. Return encoding. return encoding; } bool Decoder::validate(StringView input) { auto result = this->process(input, [](auto code_point) -> ErrorOr { if (code_point == replacement_code_point) return Error::from_errno(EINVAL); return {}; }); return !result.is_error(); } ErrorOr Decoder::to_utf8(StringView input) { StringBuilder builder(input.length()); TRY(process(input, [&builder](u32 c) { return builder.try_append_code_point(c); })); return builder.to_string_without_validation(); } ErrorOr UTF8Decoder::process(StringView input, Function(u32)> on_code_point) { for (auto c : Utf8View(input)) { TRY(on_code_point(c)); } return {}; } bool UTF8Decoder::validate(StringView input) { return Utf8View(input).validate(); } ErrorOr UTF8Decoder::to_utf8(StringView input) { return String::from_utf8_with_replacement_character(input); } static Utf16View as_utf16(StringView view, AK::Endianness endianness) { return Utf16View { { reinterpret_cast(view.bytes().data()), view.length() / 2 }, endianness }; } ErrorOr UTF16BEDecoder::process(StringView input, Function(u32)> on_code_point) { for (auto code_point : as_utf16(input, AK::Endianness::Big)) TRY(on_code_point(code_point)); return {}; } bool UTF16BEDecoder::validate(StringView input) { return as_utf16(input, AK::Endianness::Big).validate(); } ErrorOr UTF16BEDecoder::to_utf8(StringView input) { // Discard the BOM if (auto bytes = input.bytes(); bytes.size() >= 2 && bytes[0] == 0xFE && bytes[1] == 0xFF) input = input.substring_view(2); return String::from_utf16(as_utf16(input, AK::Endianness::Big)); } ErrorOr UTF16LEDecoder::process(StringView input, Function(u32)> on_code_point) { for (auto code_point : as_utf16(input, AK::Endianness::Little)) TRY(on_code_point(code_point)); return {}; } bool UTF16LEDecoder::validate(StringView input) { return as_utf16(input, AK::Endianness::Little).validate(); } ErrorOr UTF16LEDecoder::to_utf8(StringView input) { // Discard the BOM if (auto bytes = input.bytes(); bytes.size() >= 2 && bytes[0] == 0xFF && bytes[1] == 0xFE) input = input.substring_view(2); return String::from_utf16(as_utf16(input, AK::Endianness::Little)); } ErrorOr Latin1Decoder::process(StringView input, Function(u32)> on_code_point) { for (u8 ch : input) { // Latin1 is the same as the first 256 Unicode code_points, so no mapping is needed, just utf-8 encoding. TRY(on_code_point(ch)); } return {}; } ErrorOr PDFDocEncodingDecoder::process(StringView input, Function(u32)> on_code_point) { // PDF 1.7 spec, Appendix D.2 "PDFDocEncoding Character Set" // Character codes 0-8, 11-12, 14-23, 127, 159, 173 are not defined per spec. // clang-format off static constexpr Array translation_table = { 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F, 0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0017, 0x0017, 0x02D8, 0x02C7, 0x02C6, 0x02D9, 0x02DD, 0x02DB, 0x02DA, 0x02DC, 0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037, 0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F, 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047, 0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F, 0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067, 0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F, 0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077, 0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0xFFFC, 0x2022, 0x2020, 0x2021, 0x2026, 0x2014, 0x2013, 0x0192, 0x2044, 0x2039, 0x203A, 0x2212, 0x2030, 0x201E, 0x201C, 0x201D, 0x2018, 0x2019, 0x201A, 0x2122, 0xFB01, 0xFB02, 0x0141, 0x0152, 0x0160, 0x0178, 0x017D, 0x0131, 0x0142, 0x0153, 0x0161, 0x017E, 0xFFFC, 0x20AC, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7, 0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0xFFFC, 0x00AE, 0x00AF, 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7, 0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF, 0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7, 0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF, 0x00D0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7, 0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF, 0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7, 0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF, 0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7, 0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF, }; // clang-format on for (u8 ch : input) TRY(on_code_point(translation_table[ch])); return {}; } // https://encoding.spec.whatwg.org/#x-user-defined-decoder ErrorOr XUserDefinedDecoder::process(StringView input, Function(u32)> on_code_point) { auto convert_x_user_defined_to_utf8 = [](u8 ch) -> u32 { // 2. If byte is an ASCII byte, return a code point whose value is byte. // https://infra.spec.whatwg.org/#ascii-byte // An ASCII byte is a byte in the range 0x00 (NUL) to 0x7F (DEL), inclusive. // NOTE: This doesn't check for ch >= 0x00, as that would always be true due to being unsigned. if (ch <= 0x7f) return ch; // 3. Return a code point whose value is 0xF780 + byte − 0x80. return 0xF780 + ch - 0x80; }; for (auto ch : input) { TRY(on_code_point(convert_x_user_defined_to_utf8(ch))); } // 1. If byte is end-of-queue, return finished. return {}; } // https://encoding.spec.whatwg.org/#single-byte-decoder template ErrorOr SingleByteDecoder::process(StringView input, Function(u32)> on_code_point) { for (u8 const byte : input) { if (byte < 0x80) { // 2. If byte is an ASCII byte, return a code point whose value is byte. TRY(on_code_point(byte)); } else { // 3. Let code point be the index code point for byte − 0x80 in index single-byte. auto code_point = m_translation_table[byte - 0x80]; // 4. If code point is null, return error. // NOTE: Error is communicated with 0xFFFD // 5. Return a code point whose value is code point. TRY(on_code_point(code_point)); } } // 1. If byte is end-of-queue, return finished. return {}; } // https://encoding.spec.whatwg.org/#index-gb18030-ranges-code-point static Optional index_gb18030_ranges_code_point(u32 pointer) { // 1. If pointer is greater than 39419 and less than 189000, or pointer is greater than 1237575, return null. if ((pointer > 39419 && pointer < 189000) || pointer > 1237575) return {}; // 2. If pointer is 7457, return code point U+E7C7. if (pointer == 7457) return 0xE7C7; // FIXME: Encoding specification is not updated to GB-18030-2022 yet (https://github.com/whatwg/encoding/issues/312) // NOTE: This matches https://commits.webkit.org/266173@main switch (pointer) { case 19057: return 0xE81E; // 82 35 90 37 case 19058: return 0xE826; // 82 35 90 38 case 19059: return 0xE82B; // 82 35 90 39 case 19060: return 0xE82C; // 82 35 91 30 case 19061: return 0xE832; // 82 35 91 31 case 19062: return 0xE843; // 82 35 91 32 case 19063: return 0xE854; // 82 35 91 33 case 19064: return 0xE864; // 82 35 91 34 case 39076: return 0xE78D; // 84 31 82 36 case 39077: return 0xE78F; // 84 31 82 37 case 39078: return 0xE78E; // 84 31 82 38 case 39079: return 0xE790; // 84 31 82 39 case 39080: return 0xE791; // 84 31 83 30 case 39081: return 0xE792; // 84 31 83 31 case 39082: return 0xE793; // 84 31 83 32 case 39083: return 0xE794; // 84 31 83 33 case 39084: return 0xE795; // 84 31 83 34 case 39085: return 0xE796; // 84 31 83 35 default: break; } // 3. Let offset be the last pointer in index gb18030 ranges that is less than or equal to pointer and let code point offset be its corresponding code point. size_t last_index; binary_search(s_gb18030_ranges, pointer, &last_index, [](auto const pointer, auto const& entry) { return pointer - entry.pointer; }); auto offset = s_gb18030_ranges[last_index].pointer; auto code_point_offset = s_gb18030_ranges[last_index].code_point; // 4. Return a code point whose value is code point offset + pointer − offset. return code_point_offset + pointer - offset; } // https://encoding.spec.whatwg.org/#gb18030-decoder ErrorOr GB18030Decoder::process(StringView input, Function(u32)> on_code_point) { // gb18030’s decoder has an associated gb18030 first, gb18030 second, and gb18030 third (all initially 0x00). u8 first = 0x00; u8 second = 0x00; u8 third = 0x00; // gb18030’s decoder’s handler, given ioQueue and byte, runs these steps: size_t index = 0; while (true) { // 1. If byte is end-of-queue and gb18030 first, gb18030 second, and gb18030 third are 0x00, return finished. if (index >= input.length() && first == 0x00 && second == 0x00 && third == 0x00) return {}; // 2. If byte is end-of-queue, and gb18030 first, gb18030 second, or gb18030 third is not 0x00, set gb18030 first, gb18030 second, and gb18030 third to 0x00, and return error. if (index >= input.length() && (first != 0x00 || second != 0x00 || third != 0x00)) { first = 0x00; second = 0x00; third = 0x00; TRY(on_code_point(replacement_code_point)); continue; } u8 const byte = input[index++]; // 3. If gb18030 third is not 0x00, then: if (third != 0x00) { // 1. If byte is not in the range 0x30 to 0x39, inclusive, then: if (byte < 0x30 || byte > 0x39) { // 1. Restore « gb18030 second, gb18030 third, byte » to ioQueue. index -= 3; // 2. Set gb18030 first, gb18030 second, and gb18030 third to 0x00. first = 0x00; second = 0x00; third = 0x00; // 3. Return error. TRY(on_code_point(replacement_code_point)); continue; } // 2. Let code point be the index gb18030 ranges code point for ((gb18030 first − 0x81) × (10 × 126 × 10)) + ((gb18030 second − 0x30) × (10 × 126)) + ((gb18030 third − 0x81) × 10) + byte − 0x30. auto code_point = index_gb18030_ranges_code_point(((first - 0x81) * (10 * 126 * 10)) + ((second - 0x30) * (10 * 126)) + ((third - 0x81) * 10) + byte - 0x30); // 3. Set gb18030 first, gb18030 second, and gb18030 third to 0x00. first = 0x00; second = 0x00; third = 0x00; // 4. If code point is null, return error. if (!code_point.has_value()) { TRY(on_code_point(replacement_code_point)); continue; } // 5. Return a code point whose value is code point. TRY(on_code_point(code_point.value())); continue; } // 4. If gb18030 second is not 0x00, then: if (second != 0x00) { // 1. If byte is in the range 0x81 to 0xFE, inclusive, set gb18030 third to byte and return continue. if (byte >= 0x81 && byte <= 0xFE) { third = byte; continue; } // 2. Restore « gb18030 second, byte » to ioQueue, set gb18030 first and gb18030 second to 0x00, and return error. index -= 2; first = 0x00; second = 0x00; TRY(on_code_point(replacement_code_point)); continue; } // 5. If gb18030 first is not 0x00, then: if (first != 0x00) { // 1. If byte is in the range 0x30 to 0x39, inclusive, set gb18030 second to byte and return continue. if (byte >= 0x30 && byte <= 0x39) { second = byte; continue; } // 2. Let lead be gb18030 first, let pointer be null, and set gb18030 first to 0x00. auto lead = first; Optional pointer; first = 0x00; // 3. Let offset be 0x40 if byte is less than 0x7F, otherwise 0x41. u8 const offset = byte < 0x7F ? 0x40 : 0x41; // 4. If byte is in the range 0x40 to 0x7E, inclusive, or 0x80 to 0xFE, inclusive, set pointer to (lead − 0x81) × 190 + (byte − offset). if ((byte >= 0x40 && byte <= 0x7E) || (byte >= 0x80 && byte <= 0xFE)) pointer = (lead - 0x81) * 190 + (byte - offset); // 5. Let code point be null if pointer is null, otherwise the index code point for pointer in index gb18030. auto code_point = pointer.has_value() ? index_gb18030_code_point(pointer.value()) : Optional {}; // 6. If code point is non-null, return a code point whose value is code point. if (code_point.has_value()) { TRY(on_code_point(code_point.value())); continue; } // 7. If byte is an ASCII byte, restore byte to ioQueue. if (byte <= 0x7F) index--; // 8. Return error. TRY(on_code_point(replacement_code_point)); continue; } // 6. If byte is an ASCII byte, return a code point whose value is byte. if (byte <= 0x7F) { TRY(on_code_point(byte)); continue; } // 7. If byte is 0x80, return code point U+20AC. if (byte == 0x80) { TRY(on_code_point(0x20AC)); continue; } // 8. If byte is in the range 0x81 to 0xFE, inclusive, set gb18030 first to byte and return continue. if (byte >= 0x81 && byte <= 0xFE) { first = byte; continue; } // 9. Return error. TRY(on_code_point(replacement_code_point)); } } // https://encoding.spec.whatwg.org/#big5-decoder ErrorOr Big5Decoder::process(StringView input, Function(u32)> on_code_point) { // Big5’s decoder has an associated Big5 lead (initially 0x00). u8 big5_lead = 0x00; // Big5’s decoder’s handler, given ioQueue and byte, runs these steps: size_t index = 0; while (true) { // 1. If byte is end-of-queue and Big5 lead is not 0x00, set Big5 lead to 0x00 and return error. if (index >= input.length() && big5_lead != 0x00) { big5_lead = 0x00; TRY(on_code_point(replacement_code_point)); continue; } // 2. If byte is end-of-queue and Big5 lead is 0x00, return finished. if (index >= input.length() && big5_lead == 0x00) return {}; u8 const byte = input[index++]; // 3. If Big5 lead is not 0x00, let lead be Big5 lead, let pointer be null, set Big5 lead to 0x00, and then: if (big5_lead != 0x00) { auto lead = big5_lead; Optional pointer; big5_lead = 0x00; // 1. Let offset be 0x40 if byte is less than 0x7F, otherwise 0x62. u8 const offset = byte < 0x7F ? 0x40 : 0x62; // 2. If byte is in the range 0x40 to 0x7E, inclusive, or 0xA1 to 0xFE, inclusive, set pointer to (lead − 0x81) × 157 + (byte − offset). if ((byte >= 0x40 && byte <= 0x7E) || (byte >= 0xA1 && byte <= 0xFE)) pointer = (lead - 0x81) * 157 + (byte - offset); // 3. If there is a row in the table below whose first column is pointer, return the two code points listed in its second column (the third column is irrelevant): if (pointer.has_value() && pointer.value() == 1133) { TRY(on_code_point(0x00CA)); TRY(on_code_point(0x0304)); continue; } if (pointer.has_value() && pointer.value() == 1135) { TRY(on_code_point(0x00CA)); TRY(on_code_point(0x030C)); continue; } if (pointer.has_value() && pointer.value() == 1164) { TRY(on_code_point(0x00EA)); TRY(on_code_point(0x0304)); continue; } if (pointer.has_value() && pointer.value() == 1166) { TRY(on_code_point(0x00EA)); TRY(on_code_point(0x030C)); continue; } // 4. Let code point be null if pointer is null, otherwise the index code point for pointer in index Big5. auto code_pointer = pointer.has_value() ? index_big5_code_point(pointer.value()) : Optional {}; // 5. If code point is non-null, return a code point whose value is code point. if (code_pointer.has_value()) { TRY(on_code_point(code_pointer.value())); continue; } // 6. If byte is an ASCII byte, restore byte to ioQueue. if (byte <= 0x7F) index--; // 7. Return error. TRY(on_code_point(replacement_code_point)); continue; } // 4. If byte is an ASCII byte, return a code point whose value is byte. if (byte <= 0x7F) { TRY(on_code_point(byte)); continue; } // 5. If byte is in the range 0x81 to 0xFE, inclusive, set Big5 lead to byte and return continue. if (byte >= 0x81 && byte <= 0xFE) { big5_lead = byte; continue; } // 6. Return error TRY(on_code_point(replacement_code_point)); } } // https://encoding.spec.whatwg.org/#euc-jp-decoder ErrorOr EUCJPDecoder::process(StringView input, Function(u32)> on_code_point) { // EUC-JP’s decoder has an associated EUC-JP jis0212 (initially false) and EUC-JP lead (initially 0x00). bool jis0212 = false; u8 euc_jp_lead = 0x00; // EUC-JP’s decoder’s handler, given ioQueue and byte, runs these steps: size_t index = 0; while (true) { // 1. If byte is end-of-queue and EUC-JP lead is not 0x00, set EUC-JP lead to 0x00, and return error. if (index >= input.length() && euc_jp_lead != 0x00) { euc_jp_lead = 0x00; TRY(on_code_point(replacement_code_point)); continue; } // 2. If byte is end-of-queue and EUC-JP lead is 0x00, return finished. if (index >= input.length() && euc_jp_lead == 0x00) return {}; u8 const byte = input[index++]; // 3. If EUC-JP lead is 0x8E and byte is in the range 0xA1 to 0xDF, inclusive, set EUC-JP lead to 0x00 and return a code point whose value is 0xFF61 − 0xA1 + byte. if (euc_jp_lead == 0x8E && byte >= 0xA1 && byte <= 0xDF) { euc_jp_lead = 0x00; TRY(on_code_point(0xFF61 - 0xA1 + byte)); continue; } // 4. If EUC-JP lead is 0x8F and byte is in the range 0xA1 to 0xFE, inclusive, set EUC-JP jis0212 to true, set EUC-JP lead to byte, and return continue. if (euc_jp_lead == 0x8F && byte >= 0xA1 && byte <= 0xFE) { jis0212 = true; euc_jp_lead = byte; continue; } // 5. If EUC-JP lead is not 0x00, let lead be EUC-JP lead, set EUC-JP lead to 0x00, and then: if (euc_jp_lead != 0x00) { auto lead = euc_jp_lead; euc_jp_lead = 0x00; // 1. Let code point be null. Optional code_point; // 2. If lead and byte are both in the range 0xA1 to 0xFE, inclusive, then set code point to the index code point for (lead − 0xA1) × 94 + byte − 0xA1 in index jis0208 if EUC-JP jis0212 is false and in index jis0212 otherwise. if (lead >= 0xA1 && lead <= 0xFE && byte >= 0xA1 && byte <= 0xFE) { auto pointer = (lead - 0xA1) * 94 + byte - 0xA1; code_point = jis0212 ? index_jis0212_code_point(pointer) : index_jis0208_code_point(pointer); } // 3. Set EUC-JP jis0212 to false. jis0212 = false; // 4. If code point is non-null, return a code point whose value is code point. if (code_point.has_value()) { TRY(on_code_point(code_point.value())); continue; } // 5. If byte is an ASCII byte, restore byte to ioQueue. if (byte <= 0x7F) index--; // 6. Return error. TRY(on_code_point(replacement_code_point)); continue; } // 6. If byte is an ASCII byte, return a code point whose value is byte. if (byte <= 0x7F) { TRY(on_code_point(byte)); continue; } // 7. If byte is 0x8E, 0x8F, or in the range 0xA1 to 0xFE, inclusive, set EUC-JP lead to byte and return continue. if (byte == 0x8E || byte == 0x8F || (byte >= 0xA1 && byte <= 0xFE)) { euc_jp_lead = byte; continue; } // 8. Return error. TRY(on_code_point(replacement_code_point)); } } enum class ISO2022JPState { ASCII, Roman, Katakana, LeadByte, TrailByte, EscapeStart, Escape, }; // https://encoding.spec.whatwg.org/#iso-2022-jp-decoder ErrorOr ISO2022JPDecoder::process(StringView input, Function(u32)> on_code_point) { // ISO-2022-JP’s decoder has an associated ISO-2022-JP decoder state (initially ASCII), ISO-2022-JP decoder output state (initially ASCII), ISO-2022-JP lead (initially 0x00), and ISO-2022-JP output (initially false). auto decoder_state = ISO2022JPState::ASCII; auto output_state = ISO2022JPState::ASCII; u8 iso2022_jp_lead = 0x00; bool iso2022_jp_output = false; size_t index = 0; while (true) { Optional byte; if (index < input.length()) byte = input[index++]; // ISO-2022-JP’s decoder’s handler, given ioQueue and byte, runs these steps, switching on ISO-2022-JP decoder state: switch (decoder_state) { case ISO2022JPState::ASCII: // Based on byte: // 0x1B: Set ISO-2022-JP decoder state to escape start and return continue. if (byte == 0x1B) { decoder_state = ISO2022JPState::EscapeStart; continue; } // 0x00 to 0x7F, excluding 0x0E, 0x0F, and 0x1B: Set ISO-2022-JP output to false and return a code point whose value is byte. if (byte.has_value() && byte.value() <= 0x7F && byte != 0x0E && byte != 0x0F) { iso2022_jp_output = false; TRY(on_code_point(byte.value())); continue; } // end-of-queue: Return finished. if (!byte.has_value()) return {}; // Otherwise: Set ISO-2022-JP output to false and return error. iso2022_jp_output = false; TRY(on_code_point(replacement_code_point)); break; case ISO2022JPState::Roman: // Based on byte: // 0x1B: Set ISO-2022-JP decoder state to escape start and return continue. if (byte == 0x1B) { decoder_state = ISO2022JPState::EscapeStart; continue; } // 0x5C: Set ISO-2022-JP output to false and return code point U+00A5. if (byte == 0x5C) { iso2022_jp_output = false; TRY(on_code_point(0x00A5)); continue; } // 0x7E: Set ISO-2022-JP output to false and return code point U+203E. if (byte == 0x7E) { iso2022_jp_output = false; TRY(on_code_point(0x203E)); continue; } // 0x00 to 0x7F, excluding 0x0E, 0x0F, 0x1B, 0x5C, and 0x7E: Set ISO-2022-JP output to false and return a code point whose value is byte. if (byte.has_value() && byte.value() <= 0x7F && byte != 0x0E && byte != 0x0F) { iso2022_jp_output = false; TRY(on_code_point(byte.value())); continue; } // end-of-queue: Return finished. if (!byte.has_value()) return {}; // Otherwise: Set ISO-2022-JP output to false and return error. iso2022_jp_output = false; TRY(on_code_point(replacement_code_point)); break; case ISO2022JPState::Katakana: // Based on byte: // 0x1B: Set ISO-2022-JP decoder state to escape start and return continue. if (byte == 0x1B) { decoder_state = ISO2022JPState::EscapeStart; continue; } // 0x21 to 0x5F: Set ISO-2022-JP output to false and return a code point whose value is 0xFF61 − 0x21 + byte. if (byte.has_value() && byte.value() >= 0x21 && byte.value() <= 0x5F) { iso2022_jp_output = false; TRY(on_code_point(0xFF61 - 0x21 + byte.value())); continue; } // end-of-queue: Return finished. if (!byte.has_value()) return {}; // Otherwise: Set ISO-2022-JP output to false and return error. iso2022_jp_output = false; TRY(on_code_point(replacement_code_point)); break; case ISO2022JPState::LeadByte: // Based on byte: // 0x1B: Set ISO-2022-JP decoder state to escape start and return continue. if (byte == 0x1B) { decoder_state = ISO2022JPState::EscapeStart; continue; } // 0x21 to 0x7E: Set ISO-2022-JP output to false, ISO-2022-JP lead to byte, ISO-2022-JP decoder state to trail byte, and return continue. if (byte.has_value() && byte.value() >= 0x21 && byte.value() <= 0x7E) { iso2022_jp_output = false; iso2022_jp_lead = byte.value(); decoder_state = ISO2022JPState::TrailByte; continue; } // end-of-queue: Return finished. if (!byte.has_value()) return {}; // Otherwise: Set ISO-2022-JP output to false and return error. iso2022_jp_output = false; TRY(on_code_point(replacement_code_point)); break; case ISO2022JPState::TrailByte: // Based on byte: // 0x1B: Set ISO-2022-JP decoder state to escape start and return error. if (byte == 0x1B) { decoder_state = ISO2022JPState::EscapeStart; TRY(on_code_point(replacement_code_point)); continue; } // 0x21 to 0x7E: if (byte.has_value() && byte.value() >= 0x21 && byte.value() <= 0x7E) { // 1. Set the ISO-2022-JP decoder state to lead byte. decoder_state = ISO2022JPState::LeadByte; // 2. Let pointer be (ISO-2022-JP lead − 0x21) × 94 + byte − 0x21. u32 pointer = (iso2022_jp_lead - 0x21) * 94 + byte.value() - 0x21; // 3. Let code point be the index code point for pointer in index jis0208. auto code_point = index_jis0208_code_point(pointer); // 4. If code point is null, return error. if (!code_point.has_value()) { TRY(on_code_point(replacement_code_point)); continue; } // 5. Return a code point whose value is code point. TRY(on_code_point(code_point.value())); continue; } // end-of-queue: Set the ISO-2022-JP decoder state to lead byte and return error. if (!byte.has_value()) { decoder_state = ISO2022JPState::LeadByte; TRY(on_code_point(replacement_code_point)); continue; } // Otherwise: Set ISO-2022-JP decoder state to lead byte and return error. decoder_state = ISO2022JPState::LeadByte; TRY(on_code_point(replacement_code_point)); break; case ISO2022JPState::EscapeStart: // 1. If byte is either 0x24 or 0x28, set ISO-2022-JP lead to byte, ISO-2022-JP decoder state to escape, and return continue. if (byte == 0x24 || byte == 0x28) { iso2022_jp_lead = byte.value(); decoder_state = ISO2022JPState::Escape; continue; } // 2. If byte is not end-of-queue, then restore byte to ioQueue. if (byte.has_value()) index--; // 3. Set ISO-2022-JP output to false, ISO-2022-JP decoder state to ISO-2022-JP decoder output state, and return error. iso2022_jp_output = false; decoder_state = output_state; TRY(on_code_point(replacement_code_point)); break; case ISO2022JPState::Escape: { // 1. Let lead be ISO-2022-JP lead and set ISO-2022-JP lead to 0x00. auto lead = iso2022_jp_lead; iso2022_jp_lead = 0x00; // 2. Let state be null. Optional state; // 3. If lead is 0x28 and byte is 0x42, set state to ASCII. if (lead == 0x28 && byte == 0x42) state = ISO2022JPState::ASCII; // 4. If lead is 0x28 and byte is 0x4A, set state to Roman. if (lead == 0x28 && byte == 0x4A) state = ISO2022JPState::Roman; // 5. If lead is 0x28 and byte is 0x49, set state to katakana. if (lead == 0x28 && byte == 0x49) state = ISO2022JPState::Katakana; // 6. If lead is 0x24 and byte is either 0x40 or 0x42, set state to lead byte. if (lead == 0x24 && (byte == 0x40 || byte == 0x42)) state = ISO2022JPState::LeadByte; // 7. If state is non-null, then: if (state.has_value()) { // 1. Set ISO-2022-JP decoder state and ISO-2022-JP decoder output state to state. decoder_state = state.value(); output_state = state.value(); // 2. Let output be the value of ISO-2022-JP output. auto output = iso2022_jp_output; // 3. Set ISO-2022-JP output to true. iso2022_jp_output = true; // 4. Return continue, if output is false, and error otherwise. if (output) TRY(on_code_point(replacement_code_point)); continue; } // 8. If byte is end-of-queue, then restore lead to ioQueue; otherwise, restore « lead, byte » to ioQueue. index -= byte.has_value() ? 2 : 1; // 9. Set ISO-2022-JP output to false, ISO-2022-JP decoder state to ISO-2022-JP decoder output state and return error. iso2022_jp_output = false; decoder_state = output_state; TRY(on_code_point(replacement_code_point)); break; } } } } // https://encoding.spec.whatwg.org/#shift_jis-decoder ErrorOr ShiftJISDecoder::process(StringView input, Function(u32)> on_code_point) { // Shift_JIS’s decoder has an associated Shift_JIS lead (initially 0x00). u8 shift_jis_lead = 0x00; // Shift_JIS’s decoder’s handler, given ioQueue and byte, runs these steps: size_t index = 0; while (true) { // 1. If byte is end-of-queue and Shift_JIS lead is not 0x00, set Shift_JIS lead to 0x00 and return error. if (index >= input.length() && shift_jis_lead != 0x00) { shift_jis_lead = 0x00; TRY(on_code_point(replacement_code_point)); continue; } // 2. If byte is end-of-queue and Shift_JIS lead is 0x00, return finished. if (index >= input.length() && shift_jis_lead == 0x00) return {}; u8 const byte = input[index++]; // 3. If Shift_JIS lead is not 0x00, let lead be Shift_JIS lead, let pointer be null, set Shift_JIS lead to 0x00, and then: if (shift_jis_lead != 0x00) { auto lead = shift_jis_lead; Optional pointer; shift_jis_lead = 0x00; // 1. Let offset be 0x40 if byte is less than 0x7F, otherwise 0x41. u8 const offset = byte < 0x7F ? 0x40 : 0x41; // 2. Let lead offset be 0x81 if lead is less than 0xA0, otherwise 0xC1. u8 const lead_offset = lead < 0xA0 ? 0x81 : 0xC1; // 3. If byte is in the range 0x40 to 0x7E, inclusive, or 0x80 to 0xFC, inclusive, set pointer to (lead − lead offset) × 188 + byte − offset. if ((byte >= 0x40 && byte <= 0x7E) || (byte >= 0x80 && byte <= 0xFC)) pointer = (lead - lead_offset) * 188 + byte - offset; // 4. If pointer is in the range 8836 to 10715, inclusive, return a code point whose value is 0xE000 − 8836 + pointer. if (pointer.has_value() && pointer.value() >= 8836 && pointer.value() <= 10715) { TRY(on_code_point(0xE000 - 8836 + pointer.value())); continue; } // 5. Let code point be null if pointer is null, otherwise the index code point for pointer in index jis0208. auto code_point = pointer.has_value() ? index_jis0208_code_point(pointer.value()) : Optional {}; // 6. If code point is non-null, return a code point whose value is code point. if (code_point.has_value()) { TRY(on_code_point(code_point.value())); continue; } // 7. If byte is an ASCII byte, restore byte to ioQueue. if (byte <= 0x7F) index--; // 8. Return error. TRY(on_code_point(replacement_code_point)); continue; } // 4. If byte is an ASCII byte or 0x80, return a code point whose value is byte. if (byte <= 0x80) { TRY(on_code_point(byte)); continue; } // 5. If byte is in the range 0xA1 to 0xDF, inclusive, return a code point whose value is 0xFF61 − 0xA1 + byte. if (byte >= 0xA1 && byte <= 0xDF) { TRY(on_code_point(0xFF61 - 0xA1 + byte)); continue; } // 6. If byte is in the range 0x81 to 0x9F, inclusive, or 0xE0 to 0xFC, inclusive, set Shift_JIS lead to byte and return continue. if ((byte >= 0x81 && byte <= 0x9F) || (byte >= 0xE0 && byte <= 0xFC)) { shift_jis_lead = byte; continue; } // 7. Return error. TRY(on_code_point(replacement_code_point)); } } // https://encoding.spec.whatwg.org/#euc-kr-decoder ErrorOr EUCKRDecoder::process(StringView input, Function(u32)> on_code_point) { // EUC-KR’s decoder has an associated EUC-KR lead (initially 0x00). u8 euc_kr_lead = 0x00; // EUC-KR’s decoder’s handler, given ioQueue and byte, runs these steps: size_t index = 0; while (true) { // 1. If byte is end-of-queue and EUC-KR lead is not 0x00, set EUC-KR lead to 0x00 and return error. if (index >= input.length() && euc_kr_lead != 0x00) { euc_kr_lead = 0x00; TRY(on_code_point(replacement_code_point)); continue; } // 2. If byte is end-of-queue and EUC-KR lead is 0x00, return finished. if (index >= input.length() && euc_kr_lead == 0x00) return {}; u8 const byte = input[index++]; // 3. If EUC-KR lead is not 0x00, let lead be EUC-KR lead, let pointer be null, set EUC-KR lead to 0x00, and then: if (euc_kr_lead != 0x00) { auto lead = euc_kr_lead; Optional pointer; euc_kr_lead = 0x00; // 1. If byte is in the range 0x41 to 0xFE, inclusive, set pointer to (lead − 0x81) × 190 + (byte − 0x41). if (byte >= 0x41 && byte <= 0xFE) pointer = (lead - 0x81) * 190 + (byte - 0x41); // 2. Let code point be null if pointer is null, otherwise the index code point for pointer in index EUC-KR. auto code_point = pointer.has_value() ? index_euc_kr_code_point(pointer.value()) : Optional {}; // 3. If code point is non-null, return a code point whose value is code point. if (code_point.has_value()) { TRY(on_code_point(code_point.value())); continue; } // 4. If byte is an ASCII byte, restore byte to ioQueue. if (byte <= 0x7F) index--; // 5. Return error. TRY(on_code_point(replacement_code_point)); continue; } // 4. If byte is an ASCII byte, return a code point whose value is byte. if (byte <= 0x7F) { TRY(on_code_point(byte)); continue; } // 5. If byte is in the range 0x81 to 0xFE, inclusive, set EUC-KR lead to byte and return continue. if (byte >= 0x81 && byte <= 0xFE) { euc_kr_lead = byte; continue; } // 6. Return error. TRY(on_code_point(replacement_code_point)); } } // https://encoding.spec.whatwg.org/#replacement-decoder ErrorOr ReplacementDecoder::process(StringView input, Function(u32)> on_code_point) { // replacement’s decoder has an associated replacement error returned (initially false). // replacement’s decoder’s handler, given ioQueue and byte, runs these steps: // 1. If byte is end-of-queue, return finished. // 2. If replacement error returned is false, set replacement error returned to true and return error. // 3. Return finished. if (!input.is_empty()) return on_code_point(replacement_code_point); return {}; } }