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ladybird/Libraries/LibTextCodec/Decoder.cpp

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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <LibTextCodec/Decoder.h>
namespace TextCodec {
static Latin1Decoder& latin1_decoder()
{
static Latin1Decoder* decoder;
if (!decoder)
decoder = new Latin1Decoder;
return *decoder;
}
static UTF8Decoder& utf8_decoder()
{
static UTF8Decoder* decoder;
if (!decoder)
decoder = new UTF8Decoder;
return *decoder;
}
Decoder* decoder_for(const String& encoding)
{
ASSERT(is_standardized_encoding(encoding));
if (encoding.equals_ignoring_case("windows-1252"))
return &latin1_decoder();
if (encoding.equals_ignoring_case("utf-8"))
return &utf8_decoder();
dbg() << "TextCodec: No decoder implemented for encoding '" << encoding << "'";
return nullptr;
}
// https://encoding.spec.whatwg.org/#concept-encoding-get
String get_standardized_encoding(const String& encoding)
{
String trimmed_lowercase_encoding = encoding.trim_whitespace().to_lowercase();
if (trimmed_lowercase_encoding.is_one_of("unicode-1-1-utf-8", "unicode11utf8", "unicode20utf8", "utf-8", "utf8", "x-unicode20utf8"))
return "UTF-8";
if (trimmed_lowercase_encoding.is_one_of("866", "cp866", "csibm866", "ibm666"))
return "IBM666";
if (trimmed_lowercase_encoding.is_one_of("csisolatin2", "iso-8859-2", "iso-ir-101", "iso8859-2", "iso88592", "iso_8859-2", "iso_8859-2:1987", "l2", "latin2"))
return "ISO-8859-2";
if (trimmed_lowercase_encoding.is_one_of("csisolatin3", "iso-8859-3", "iso-ir-109", "iso8859-3", "iso88593", "iso_8859-3", "iso_8859-3:1988", "l3", "latin3"))
return "ISO-8859-3";
if (trimmed_lowercase_encoding.is_one_of("csisolatin4", "iso-8859-4", "iso-ir-110", "iso8859-4", "iso88594", "iso_8859-4", "iso_8859-4:1989", "l4", "latin4"))
return "ISO-8859-4";
if (trimmed_lowercase_encoding.is_one_of("csisolatincyrillic", "cyrillic", "iso-8859-5", "iso-ir-144", "iso8859-5", "iso88595", "iso_8859-5", "iso_8859-5:1988"))
return "ISO-8859-5";
if (trimmed_lowercase_encoding.is_one_of("arabic", "asmo-708", "csiso88596e", "csiso88596i", "csisolatinarabic", "ecma-114", "iso-8859-6", "iso-8859-6-e", "iso-8859-6-i", "iso-ir-127", "iso8859-6", "iso88596", "iso_8859-6", "iso_8859-6:1987"))
return "ISO-8859-6";
if (trimmed_lowercase_encoding.is_one_of("csisolatingreek", "ecma-118", "elot_928", "greek", "greek8", "iso-8859-7", "iso-ir-126", "iso8859-7", "iso88597", "iso_8859-7", "iso_8859-7:1987", "sun_eu_greek"))
return "ISO-8859-7";
if (trimmed_lowercase_encoding.is_one_of("csiso88598e", "csisolatinhebrew", "hebrew", "iso-8859-8", "iso-8859-8-e", "iso-ir-138", "iso8859-8", "iso88598", "iso_8859-8", "iso_8859-8:1988", "visual"))
return "ISO-8859-8";
if (trimmed_lowercase_encoding.is_one_of("csiso88598i", "iso-8859-8-i", "logical"))
return "ISO-8859-8-I";
if (trimmed_lowercase_encoding.is_one_of("csisolatin6", "iso8859-10", "iso-ir-157", "iso8859-10", "iso885910", "l6", "latin6"))
return "ISO-8859-10";
if (trimmed_lowercase_encoding.is_one_of("iso-8859-13", "iso8859-13", "iso885913"))
return "ISO-8859-13";
if (trimmed_lowercase_encoding.is_one_of("iso-8859-14", "iso8859-14", "iso885914"))
return "ISO-8859-14";
if (trimmed_lowercase_encoding.is_one_of("csisolatin9", "iso-8859-15", "iso8859-15", "iso885915", "iso_8859-15", "l9"))
return "ISO-8859-15";
if (trimmed_lowercase_encoding == "iso-8859-16")
return "ISO-8859-16";
if (trimmed_lowercase_encoding.is_one_of("cskoi8r", "koi", "koi8", "koi8-r", "koi8_r"))
return "KOI8-R";
if (trimmed_lowercase_encoding.is_one_of("koi8-ru", "koi8-u"))
return "KOI8-U";
if (trimmed_lowercase_encoding.is_one_of("csmacintosh", "mac", "macintosh", "x-mac-roman"))
return "macintosh";
if (trimmed_lowercase_encoding.is_one_of("dos-874", "iso-8859-11", "iso8859-11", "iso885911", "tis-620", "windows-874"))
return "windows-874";
if (trimmed_lowercase_encoding.is_one_of("cp1250", "windows-1250", "x-cp1250"))
return "windows-1250";
if (trimmed_lowercase_encoding.is_one_of("cp1251", "windows-1251", "x-cp1251"))
return "windows-1251";
if (trimmed_lowercase_encoding.is_one_of("ansi_x3.4-1968", "ascii", "cp1252", "cp819", "csisolatin1", "ibm819", "iso-8859-1", "iso-ir-100", "iso8859-1", "iso88591", "iso_8859-1", "iso_8859-1:1987", "l1", "latin1", "us-ascii", "windows-1252", "x-cp1252"))
return "windows-1252";
if (trimmed_lowercase_encoding.is_one_of("cp1253", "windows-1253", "x-cp1253"))
return "windows-1253";
if (trimmed_lowercase_encoding.is_one_of("cp1254", "csisolatin5", "iso-8859-9", "iso-ir-148", "iso-8859-9", "iso-88599", "iso_8859-9", "iso_8859-9:1989", "l5", "latin5", "windows-1254", "x-cp1254"))
return "windows-1254";
if (trimmed_lowercase_encoding.is_one_of("cp1255", "windows-1255", "x-cp1255"))
return "windows-1255";
if (trimmed_lowercase_encoding.is_one_of("cp1256", "windows-1256", "x-cp1256"))
return "windows-1256";
if (trimmed_lowercase_encoding.is_one_of("cp1257", "windows-1257", "x-cp1257"))
return "windows-1257";
if (trimmed_lowercase_encoding.is_one_of("cp1258", "windows-1258", "x-cp1258"))
return "windows-1258";
if (trimmed_lowercase_encoding.is_one_of("x-mac-cyrillic", "x-mac-ukrainian"))
return "x-mac-cyrillic";
if (trimmed_lowercase_encoding.is_one_of("chinese", "csgb2312", "csiso58gb231280", "gb2312", "gb_2312", "gb_2312-80", "gbk", "iso-ir-58", "x-gbk"))
return "GBK";
if (trimmed_lowercase_encoding == "gb18030")
return "gb18030";
if (trimmed_lowercase_encoding.is_one_of("big5", "big5-hkscs", "cn-big5", "csbig5", "x-x-big5"))
return "Big5";
if (trimmed_lowercase_encoding.is_one_of("cseucpkdfmtjapanese", "euc-jp", "x-euc-jp"))
return "EUC-JP";
if (trimmed_lowercase_encoding.is_one_of("csiso2022jp", "iso-2022-jp"))
return "ISO-2022-JP";
if (trimmed_lowercase_encoding.is_one_of("csshiftjis", "ms932", "ms_kanji", "shift-jis", "shift_jis", "sjis", "windows-31j", "x-sjis"))
return "Shift_JIS";
if (trimmed_lowercase_encoding.is_one_of("cseuckr", "csksc56011987", "euc-kr", "iso-ir-149", "korean", "ks_c_5601-1987", "ks_c_5601-1989", "ksc5601", "ksc_5601", "windows-949"))
return "EUC-KR";
if (trimmed_lowercase_encoding.is_one_of("csiso2022kr", "hz-gb-2312", "iso-2022-cn", "iso-2022-cn-ext", "iso-2022-kr", "replacement"))
return "replacement";
if (trimmed_lowercase_encoding.is_one_of("unicodefffe", "utf-16be"))
return "UTF-16BE";
if (trimmed_lowercase_encoding.is_one_of("csunicode", "iso-10646-ucs-2", "ucs-2", "unicode", "unicodefeff", "utf-16", "utf-16le"))
return "UTF-16LE";
if (trimmed_lowercase_encoding == "x-user-defined")
return "x-user-defined";
dbg() << "TextCodec: Unrecognized encoding: " << encoding;
return {};
}
bool is_standardized_encoding(const String& encoding)
{
auto lowercase_encoding = encoding.to_lowercase();
return lowercase_encoding.is_one_of("utf-8", "ibm666", "iso-8859-2", "iso-8859-3", "iso-8859-4", "iso-8859-5", "iso-8859-6", "iso-8859-7", "iso-8859-8", "iso-8859-8-I", "iso-8859-10", "iso-8859-13", "iso-8859-14", "iso-8859-15", "iso-8859-16", "koi8-r", "koi8-u", "macintosh", "windows-874", "windows-1250", "windows-1251", "windows-1252", "windows-1253", "windows-1254", "windows-1255", "windows-1256", "windows-1257", "windows-1258", "x-mac-cyrillic", "gbk", "gb18030", "big5", "euc-jp", "iso-2022-JP", "shift_jis", "euc-kr", "replacement", "utf-16be", "utf-16le", "x-user-defined");
}
String UTF8Decoder::to_utf8(const StringView& input)
{
return input;
}
String Latin1Decoder::to_utf8(const StringView& input)
{
StringBuilder builder(input.length());
for (size_t i = 0; i < input.length(); ++i) {
u8 ch = input[i];
// Latin1 is the same as the first 256 Unicode code_points, so no mapping is needed, just utf-8 encoding.
builder.append_code_point(ch);
}
return builder.to_string();
}
}
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