1// Copyright Joyent, Inc. and other Node contributors. 2// 3// Permission is hereby granted, free of charge, to any person obtaining a 4// copy of this software and associated documentation files (the 5// "Software"), to deal in the Software without restriction, including 6// without limitation the rights to use, copy, modify, merge, publish, 7// distribute, sublicense, and/or sell copies of the Software, and to permit 8// persons to whom the Software is furnished to do so, subject to the 9// following conditions: 10// 11// The above copyright notice and this permission notice shall be included 12// in all copies or substantial portions of the Software. 13// 14// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 15// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 16// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 17// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 18// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 19// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 20// USE OR OTHER DEALINGS IN THE SOFTWARE. 21 22'use strict'; 23require('../common'); 24const assert = require('assert'); 25 26// This test verifies that stream.unshift(Buffer.alloc(0)) or 27// stream.unshift('') does not set state.reading=false. 28const Readable = require('stream').Readable; 29 30const r = new Readable(); 31let nChunks = 10; 32const chunk = Buffer.alloc(10, 'x'); 33 34r._read = function(n) { 35 setImmediate(() => { 36 r.push(--nChunks === 0 ? null : chunk); 37 }); 38}; 39 40let readAll = false; 41const seen = []; 42r.on('readable', () => { 43 let chunk; 44 while (chunk = r.read()) { 45 seen.push(chunk.toString()); 46 // Simulate only reading a certain amount of the data, 47 // and then putting the rest of the chunk back into the 48 // stream, like a parser might do. We just fill it with 49 // 'y' so that it's easy to see which bits were touched, 50 // and which were not. 51 const putBack = Buffer.alloc(readAll ? 0 : 5, 'y'); 52 readAll = !readAll; 53 r.unshift(putBack); 54 } 55}); 56 57const expect = 58 [ 'xxxxxxxxxx', 59 'yyyyy', 60 'xxxxxxxxxx', 61 'yyyyy', 62 'xxxxxxxxxx', 63 'yyyyy', 64 'xxxxxxxxxx', 65 'yyyyy', 66 'xxxxxxxxxx', 67 'yyyyy', 68 'xxxxxxxxxx', 69 'yyyyy', 70 'xxxxxxxxxx', 71 'yyyyy', 72 'xxxxxxxxxx', 73 'yyyyy', 74 'xxxxxxxxxx', 75 'yyyyy' ]; 76 77r.on('end', () => { 78 assert.deepStrictEqual(seen, expect); 79 console.log('ok'); 80}); 81