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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
'use strict';
require('../common');
const assert = require('assert');
// This test verifies that stream.unshift(Buffer.alloc(0)) or
// stream.unshift('') does not set state.reading=false.
const Readable = require('stream').Readable;
const r = new Readable();
let nChunks = 10;
const chunk = Buffer.alloc(10, 'x');
r._read = function(n) {
setImmediate(() => {
r.push(--nChunks === 0 ? null : chunk);
});
};
let readAll = false;
const seen = [];
r.on('readable', () => {
let chunk;
while ((chunk = r.read()) !== null) {
seen.push(chunk.toString());
// Simulate only reading a certain amount of the data,
// and then putting the rest of the chunk back into the
// stream, like a parser might do. We just fill it with
// 'y' so that it's easy to see which bits were touched,
// and which were not.
const putBack = Buffer.alloc(readAll ? 0 : 5, 'y');
readAll = !readAll;
r.unshift(putBack);
}
});
const expect =
[ 'xxxxxxxxxx',
'yyyyy',
'xxxxxxxxxx',
'yyyyy',
'xxxxxxxxxx',
'yyyyy',
'xxxxxxxxxx',
'yyyyy',
'xxxxxxxxxx',
'yyyyy',
'xxxxxxxxxx',
'yyyyy',
'xxxxxxxxxx',
'yyyyy',
'xxxxxxxxxx',
'yyyyy',
'xxxxxxxxxx',
'yyyyy' ];
r.on('end', () => {
assert.deepStrictEqual(seen, expect);
console.log('ok');
});
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