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'use strict'; var iconvLite = require('iconv-lite'); // Expose to the world module.exports.convert = convert; /** * Convert encoding of an UTF-8 string or a buffer * * @param {String|Buffer} str String to be converted * @param {String} to Encoding to be converted to * @param {String} [from='UTF-8'] Encoding to be converted from * @return {Buffer} Encoded string */ function convert(str, to, from) { from = checkEncoding(from || 'UTF-8'); to = checkEncoding(to || 'UTF-8'); str = str || ''; var result; if (from !== 'UTF-8' && typeof str === 'string') { str = Buffer.from(str, 'binary'); } if (from === to) { if (typeof str === 'string') { result = Buffer.from(str); } else { result = str; } } else { try { result = convertIconvLite(str, to, from); } catch (E) { console.error(E); result = str; } } if (typeof result === 'string') { result = Buffer.from(result, 'utf-8'); } return result; } /** * Convert encoding of astring with iconv-lite * * @param {String|Buffer} str String to be converted * @param {String} to Encoding to be converted to * @param {String} [from='UTF-8'] Encoding to be converted from * @return {Buffer} Encoded string */ function convertIconvLite(str, to, from) { if (to === 'UTF-8') { return iconvLite.decode(str, from); } else if (from === 'UTF-8') { return iconvLite.encode(str, to); } else { return iconvLite.encode(iconvLite.decode(str, from), to); } } /** * Converts charset name if needed * * @param {String} name Character set * @return {String} Character set name */ function checkEncoding(name) { return (name || '') .toString() .trim() .replace(/^latin[\-_]?(\d+)$/i, 'ISO-8859-$1') .replace(/^win(?:dows)?[\-_]?(\d+)$/i, 'WINDOWS-$1') .replace(/^utf[\-_]?(\d+)$/i, 'UTF-$1') .replace(/^ks_c_5601\-1987$/i, 'CP949') .replace(/^us[\-_]?ascii$/i, 'ASCII') .toUpperCase(); }