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Diffstat (limited to '')
| -rw-r--r-- | lib/fileapi/encoding.js | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/lib/fileapi/encoding.js b/lib/fileapi/encoding.js new file mode 100644 index 0000000..1d1d2b6 --- /dev/null +++ b/lib/fileapi/encoding.js @@ -0,0 +1,290 @@ +'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 +} |