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Viewing file:     string.js (1.32 KB)      -rw-r--r--

'use strict';

const Iconv = require('iconv-lite');
const { createLRU } = require('lru.min');

const decoderCache = createLRU({
  max: 500,
});

exports.decode = function (buffer, encoding, start, end, options) {
  if (Buffer.isEncoding(encoding)) {
    return buffer.toString(encoding, start, end);
  }

  // Optimize for common case: encoding="short_string", options=undefined.
  let decoder;
  if (!options) {
    decoder = decoderCache.get(encoding);
    if (!decoder) {
      decoder = Iconv.getDecoder(encoding);
      decoderCache.set(encoding, decoder);
    }
  } else {
    const decoderArgs = { encoding, options };
    const decoderKey = JSON.stringify(decoderArgs);
    decoder = decoderCache.get(decoderKey);
    if (!decoder) {
      decoder = Iconv.getDecoder(decoderArgs.encoding, decoderArgs.options);
      decoderCache.set(decoderKey, decoder);
    }
  }

  const res = decoder.write(buffer.slice(start, end));
  const trail = decoder.end();

  return trail ? res + trail : res;
};

exports.encode = function (string, encoding, options) {
  if (Buffer.isEncoding(encoding)) {
    return Buffer.from(string, encoding);
  }

  const encoder = Iconv.getEncoder(encoding, options || {});

  const res = encoder.write(string);
  const trail = encoder.end();

  return trail && trail.length > 0 ? Buffer.concat([res, trail]) : res;
};