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Dir : ~/lib/node_modules/npm/node_modules/encoding/lib/

View File Name : encoding.js

'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();
}