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'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;
};