| 1365 | } |
| 1366 | |
| 1367 | async function read(handle, bufferOrParams, offset, length, position) { |
| 1368 | let buffer = bufferOrParams; |
| 1369 | if (!isArrayBufferView(buffer)) { |
| 1370 | // This is fh.read(params) |
| 1371 | if (bufferOrParams !== undefined) { |
| 1372 | validateObject(bufferOrParams, 'options', kValidateObjectAllowNullable); |
| 1373 | } |
| 1374 | ({ |
| 1375 | buffer = Buffer.alloc(16384), |
| 1376 | offset = 0, |
| 1377 | length = buffer.byteLength - offset, |
| 1378 | position = null, |
| 1379 | } = bufferOrParams ?? kEmptyObject); |
| 1380 | |
| 1381 | validateBuffer(buffer); |
| 1382 | } |
| 1383 | |
| 1384 | if (offset !== null && typeof offset === 'object') { |
| 1385 | // This is fh.read(buffer, options) |
| 1386 | ({ |
| 1387 | offset = 0, |
| 1388 | length = buffer.byteLength - offset, |
| 1389 | position = null, |
| 1390 | } = offset); |
| 1391 | } |
| 1392 | |
| 1393 | if (offset == null) { |
| 1394 | offset = 0; |
| 1395 | } else { |
| 1396 | validateInteger(offset, 'offset', 0); |
| 1397 | } |
| 1398 | |
| 1399 | length ??= buffer.byteLength - offset; |
| 1400 | |
| 1401 | if (position == null) { |
| 1402 | position = -1; |
| 1403 | } else { |
| 1404 | validatePosition(position, 'position', length); |
| 1405 | } |
| 1406 | |
| 1407 | if (length === 0) |
| 1408 | return { __proto__: null, bytesRead: length, buffer }; |
| 1409 | |
| 1410 | if (buffer.byteLength === 0) { |
| 1411 | throw new ERR_INVALID_ARG_VALUE('buffer', buffer, |
| 1412 | 'is empty and cannot be written'); |
| 1413 | } |
| 1414 | |
| 1415 | validateOffsetLengthRead(offset, length, buffer.byteLength); |
| 1416 | |
| 1417 | const bytesRead = (await PromisePrototypeThen( |
| 1418 | binding.read(handle.fd, buffer, offset, length, position, kUsePromises), |
| 1419 | undefined, |
| 1420 | handleErrorFromBinding, |
| 1421 | )) || 0; |
| 1422 | |
| 1423 | return { __proto__: null, bytesRead, buffer }; |
| 1424 | } |