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'use strict'
/**
* @see https://encoding.spec.whatwg.org/#concept-encoding-get
* @param {string|undefined} label
*/
function getEncoding (label) {
if (!label) {
return 'failure'
}
// 1. Remove any leading and trailing ASCII whitespace from label.
// 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.
switch (label.trim().toLowerCase()) {
case 'unicode-1-1-utf-8':
case 'unicode11utf8':
case 'unicode20utf8':
case 'utf-8':
case 'utf8':
case 'x-unicode20utf8':
return 'UTF-8'
case '866':
case 'cp866':
case 'csibm866':
case 'ibm866':
return 'IBM866'
case 'csisolatin2':
case 'iso-8859-2':
case 'iso-ir-101':
case 'iso8859-2':
case 'iso88592':
case 'iso_8859-2':
case 'iso_8859-2:1987':
case 'l2':
case 'latin2':
return 'ISO-8859-2'
case 'csisolatin3':
case 'iso-8859-3':
case 'iso-ir-109':
case 'iso8859-3':
case 'iso88593':
case 'iso_8859-3':
case 'iso_8859-3:1988':
case 'l3':
case 'latin3':
return 'ISO-8859-3'
case 'csisolatin4':
case 'iso-8859-4':
case 'iso-ir-110':
case 'iso8859-4':
case 'iso88594':
case 'iso_8859-4':
case 'iso_8859-4:1988':
case 'l4':
case 'latin4':
return 'ISO-8859-4'
case 'csisolatincyrillic':
case 'cyrillic':
case 'iso-8859-5':
case 'iso-ir-144':
case 'iso8859-5':
case 'iso88595':
case 'iso_8859-5':
case 'iso_8859-5:1988':
return 'ISO-8859-5'
case 'arabic':
case 'asmo-708':
case 'csiso88596e':
case 'csiso88596i':
case 'csisolatinarabic':
case 'ecma-114':
case 'iso-8859-6':
case 'iso-8859-6-e':
case 'iso-8859-6-i':
case 'iso-ir-127':
case 'iso8859-6':
case 'iso88596':
case 'iso_8859-6':
case 'iso_8859-6:1987':
return 'ISO-8859-6'
case 'csisolatingreek':
case 'ecma-118':
case 'elot_928':
case 'greek':
case 'greek8':
case 'iso-8859-7':
case 'iso-ir-126':
case 'iso8859-7':
case 'iso88597':
case 'iso_8859-7':
case 'iso_8859-7:1987':
case 'sun_eu_greek':
return 'ISO-8859-7'
case 'csiso88598e':
case 'csisolatinhebrew':
case 'hebrew':
case 'iso-8859-8':
case 'iso-8859-8-e':
case 'iso-ir-138':
case 'iso8859-8':
case 'iso88598':
case 'iso_8859-8':
case 'iso_8859-8:1988':
case 'visual':
return 'ISO-8859-8'
case 'csiso88598i':
case 'iso-8859-8-i':
case 'logical':
return 'ISO-8859-8-I'
case 'csisolatin6':
case 'iso-8859-10':
case 'iso-ir-157':
case 'iso8859-10':
case 'iso885910':
case 'l6':
case 'latin6':
return 'ISO-8859-10'
case 'iso-8859-13':
case 'iso8859-13':
case 'iso885913':
return 'ISO-8859-13'
case 'iso-8859-14':
case 'iso8859-14':
case 'iso885914':
return 'ISO-8859-14'
case 'csisolatin9':
case 'iso-8859-15':
case 'iso8859-15':
case 'iso885915':
case 'iso_8859-15':
case 'l9':
return 'ISO-8859-15'
case 'iso-8859-16':
return 'ISO-8859-16'
case 'cskoi8r':
case 'koi':
case 'koi8':
case 'koi8-r':
case 'koi8_r':
return 'KOI8-R'
case 'koi8-ru':
case 'koi8-u':
return 'KOI8-U'
case 'csmacintosh':
case 'mac':
case 'macintosh':
case 'x-mac-roman':
return 'macintosh'
case 'iso-8859-11':
case 'iso8859-11':
case 'iso885911':
case 'tis-620':
case 'windows-874':
return 'windows-874'
case 'cp1250':
case 'windows-1250':
case 'x-cp1250':
return 'windows-1250'
case 'cp1251':
case 'windows-1251':
case 'x-cp1251':
return 'windows-1251'
case 'ansi_x3.4-1968':
case 'ascii':
case 'cp1252':
case 'cp819':
case 'csisolatin1':
case 'ibm819':
case 'iso-8859-1':
case 'iso-ir-100':
case 'iso8859-1':
case 'iso88591':
case 'iso_8859-1':
case 'iso_8859-1:1987':
case 'l1':
case 'latin1':
case 'us-ascii':
case 'windows-1252':
case 'x-cp1252':
return 'windows-1252'
case 'cp1253':
case 'windows-1253':
case 'x-cp1253':
return 'windows-1253'
case 'cp1254':
case 'csisolatin5':
case 'iso-8859-9':
case 'iso-ir-148':
case 'iso8859-9':
case 'iso88599':
case 'iso_8859-9':
case 'iso_8859-9:1989':
case 'l5':
case 'latin5':
case 'windows-1254':
case 'x-cp1254':
return 'windows-1254'
case 'cp1255':
case 'windows-1255':
case 'x-cp1255':
return 'windows-1255'
case 'cp1256':
case 'windows-1256':
case 'x-cp1256':
return 'windows-1256'
case 'cp1257':
case 'windows-1257':
case 'x-cp1257':
return 'windows-1257'
case 'cp1258':
case 'windows-1258':
case 'x-cp1258':
return 'windows-1258'
case 'x-mac-cyrillic':
case 'x-mac-ukrainian':
return 'x-mac-cyrillic'
case 'chinese':
case 'csgb2312':
case 'csiso58gb231280':
case 'gb2312':
case 'gb_2312':
case 'gb_2312-80':
case 'gbk':
case 'iso-ir-58':
case 'x-gbk':
return 'GBK'
case 'gb18030':
return 'gb18030'
case 'big5':
case 'big5-hkscs':
case 'cn-big5':
case 'csbig5':
case 'x-x-big5':
return 'Big5'
case 'cseucpkdfmtjapanese':
case 'euc-jp':
case 'x-euc-jp':
return 'EUC-JP'
case 'csiso2022jp':
case 'iso-2022-jp':
return 'ISO-2022-JP'
case 'csshiftjis':
case 'ms932':
case 'ms_kanji':
case 'shift-jis':
case 'shift_jis':
case 'sjis':
case 'windows-31j':
case 'x-sjis':
return 'Shift_JIS'
case 'cseuckr':
case 'csksc56011987':
case 'euc-kr':
case 'iso-ir-149':
case 'korean':
case 'ks_c_5601-1987':
case 'ks_c_5601-1989':
case 'ksc5601':
case 'ksc_5601':
case 'windows-949':
return 'EUC-KR'
case 'csiso2022kr':
case 'hz-gb-2312':
case 'iso-2022-cn':
case 'iso-2022-cn-ext':
case 'iso-2022-kr':
case 'replacement':
return 'replacement'
case 'unicodefffe':
case 'utf-16be':
return 'UTF-16BE'
case 'csunicode':
case 'iso-10646-ucs-2':
case 'ucs-2':
case 'unicode':
case 'unicodefeff':
case 'utf-16':
case 'utf-16le':
return 'UTF-16LE'
case 'x-user-defined':
return 'x-user-defined'
default: return 'failure'
}
}
module.exports = {
getEncoding
}
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