11cb0ef41Sopenharmony_ci// Copyright Joyent, Inc. and other Node contributors. 21cb0ef41Sopenharmony_ci// 31cb0ef41Sopenharmony_ci// Permission is hereby granted, free of charge, to any person obtaining a 41cb0ef41Sopenharmony_ci// copy of this software and associated documentation files (the 51cb0ef41Sopenharmony_ci// "Software"), to deal in the Software without restriction, including 61cb0ef41Sopenharmony_ci// without limitation the rights to use, copy, modify, merge, publish, 71cb0ef41Sopenharmony_ci// distribute, sublicense, and/or sell copies of the Software, and to permit 81cb0ef41Sopenharmony_ci// persons to whom the Software is furnished to do so, subject to the 91cb0ef41Sopenharmony_ci// following conditions: 101cb0ef41Sopenharmony_ci// 111cb0ef41Sopenharmony_ci// The above copyright notice and this permission notice shall be included 121cb0ef41Sopenharmony_ci// in all copies or substantial portions of the Software. 131cb0ef41Sopenharmony_ci// 141cb0ef41Sopenharmony_ci// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 151cb0ef41Sopenharmony_ci// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 161cb0ef41Sopenharmony_ci// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 171cb0ef41Sopenharmony_ci// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 181cb0ef41Sopenharmony_ci// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 191cb0ef41Sopenharmony_ci// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 201cb0ef41Sopenharmony_ci// USE OR OTHER DEALINGS IN THE SOFTWARE. 211cb0ef41Sopenharmony_ci 221cb0ef41Sopenharmony_ci'use strict'; 231cb0ef41Sopenharmony_ciconst common = require('../common'); 241cb0ef41Sopenharmony_ciconst assert = require('assert'); 251cb0ef41Sopenharmony_ciconst { Readable } = require('stream'); 261cb0ef41Sopenharmony_ci 271cb0ef41Sopenharmony_cilet len = 0; 281cb0ef41Sopenharmony_ciconst chunks = new Array(10); 291cb0ef41Sopenharmony_cifor (let i = 1; i <= 10; i++) { 301cb0ef41Sopenharmony_ci chunks[i - 1] = Buffer.allocUnsafe(i); 311cb0ef41Sopenharmony_ci len += i; 321cb0ef41Sopenharmony_ci} 331cb0ef41Sopenharmony_ci 341cb0ef41Sopenharmony_ciconst test = new Readable(); 351cb0ef41Sopenharmony_cilet n = 0; 361cb0ef41Sopenharmony_citest._read = function(size) { 371cb0ef41Sopenharmony_ci const chunk = chunks[n++]; 381cb0ef41Sopenharmony_ci setTimeout(function() { 391cb0ef41Sopenharmony_ci test.push(chunk === undefined ? null : chunk); 401cb0ef41Sopenharmony_ci }, 1); 411cb0ef41Sopenharmony_ci}; 421cb0ef41Sopenharmony_ci 431cb0ef41Sopenharmony_citest.on('end', thrower); 441cb0ef41Sopenharmony_cifunction thrower() { 451cb0ef41Sopenharmony_ci throw new Error('this should not happen!'); 461cb0ef41Sopenharmony_ci} 471cb0ef41Sopenharmony_ci 481cb0ef41Sopenharmony_cilet bytesread = 0; 491cb0ef41Sopenharmony_citest.on('readable', function() { 501cb0ef41Sopenharmony_ci const b = len - bytesread - 1; 511cb0ef41Sopenharmony_ci const res = test.read(b); 521cb0ef41Sopenharmony_ci if (res) { 531cb0ef41Sopenharmony_ci bytesread += res.length; 541cb0ef41Sopenharmony_ci console.error(`br=${bytesread} len=${len}`); 551cb0ef41Sopenharmony_ci setTimeout(next, 1); 561cb0ef41Sopenharmony_ci } 571cb0ef41Sopenharmony_ci test.read(0); 581cb0ef41Sopenharmony_ci}); 591cb0ef41Sopenharmony_citest.read(0); 601cb0ef41Sopenharmony_ci 611cb0ef41Sopenharmony_cifunction next() { 621cb0ef41Sopenharmony_ci // Now let's make 'end' happen 631cb0ef41Sopenharmony_ci test.removeListener('end', thrower); 641cb0ef41Sopenharmony_ci test.on('end', common.mustCall()); 651cb0ef41Sopenharmony_ci 661cb0ef41Sopenharmony_ci // One to get the last byte 671cb0ef41Sopenharmony_ci let r = test.read(); 681cb0ef41Sopenharmony_ci assert(r); 691cb0ef41Sopenharmony_ci assert.strictEqual(r.length, 1); 701cb0ef41Sopenharmony_ci r = test.read(); 711cb0ef41Sopenharmony_ci assert.strictEqual(r, null); 721cb0ef41Sopenharmony_ci} 73