文件操作 - state.js
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文件: /var/www/OLD/node_modules/readable-stream/lib/internal/streams/state.js
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'use strict' const { MathFloor, NumberIsInteger } = require('../../ours/primordials') const { validateInteger } = require('../validators') const { ERR_INVALID_ARG_VALUE } = require('../../ours/errors').codes let defaultHighWaterMarkBytes = 16 * 1024 let defaultHighWaterMarkObjectMode = 16 function highWaterMarkFrom(options, isDuplex, duplexKey) { return options.highWaterMark != null ? options.highWaterMark : isDuplex ? options[duplexKey] : null } function getDefaultHighWaterMark(objectMode) { return objectMode ? defaultHighWaterMarkObjectMode : defaultHighWaterMarkBytes } function setDefaultHighWaterMark(objectMode, value) { validateInteger(value, 'value', 0) if (objectMode) { defaultHighWaterMarkObjectMode = value } else { defaultHighWaterMarkBytes = value } } function getHighWaterMark(state, options, duplexKey, isDuplex) { const hwm = highWaterMarkFrom(options, isDuplex, duplexKey) if (hwm != null) { if (!NumberIsInteger(hwm) || hwm < 0) { const name = isDuplex ? `options.${duplexKey}` : 'options.highWaterMark' throw new ERR_INVALID_ARG_VALUE(name, hwm) } return MathFloor(hwm) } // Default value return getDefaultHighWaterMark(state.objectMode) } module.exports = { getHighWaterMark, getDefaultHighWaterMark, setDefaultHighWaterMark }
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