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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.
+
+var common = require('../common');
+var assert = require('assert');
+
+var Readable = require('stream').Readable;
+
+test1();
+test2();
+
+function test1() {
+ var r = new Readable();
+
+ // should not end when we get a Buffer(0) or '' as the _read result
+ // that just means that there is *temporarily* no data, but to go
+ // ahead and try again later.
+ //
+ // note that this is very unusual. it only works for crypto streams
+ // because the other side of the stream will call read(0) to cycle
+ // data through openssl. that's why we set the timeouts to call
+ // r.read(0) again later, otherwise there is no more work being done
+ // and the process just exits.
+
+ var buf = new Buffer(5);
+ buf.fill('x');
+ var reads = 5;
+ r._read = function(n) {
+ switch (reads--) {
+ case 0:
+ return r.push(null); // EOF
+ case 1:
+ return r.push(buf);
+ case 2:
+ setTimeout(r.read.bind(r, 0), 50);
+ return r.push(new Buffer(0)); // Not-EOF!
+ case 3:
+ setTimeout(r.read.bind(r, 0), 50);
+ return process.nextTick(function() {
+ return r.push(new Buffer(0));
+ });
+ case 4:
+ setTimeout(r.read.bind(r, 0), 50);
+ return setTimeout(function() {
+ return r.push(new Buffer(0));
+ });
+ case 5:
+ return setTimeout(function() {
+ return r.push(buf);
+ });
+ default:
+ throw new Error('unreachable');
+ }
+ };
+
+ var results = [];
+ function flow() {
+ var chunk;
+ while (null !== (chunk = r.read()))
+ results.push(chunk + '');
+ }
+ r.on('readable', flow);
+ r.on('end', function() {
+ results.push('EOF');
+ });
+ flow();
+
+ process.on('exit', function() {
+ assert.deepEqual(results, [ 'xxxxx', 'xxxxx', 'EOF' ]);
+ console.log('ok');
+ });
+}
+
+function test2() {
+ var r = new Readable({ encoding: 'base64' });
+ var reads = 5;
+ r._read = function(n) {
+ if (!reads--)
+ return r.push(null); // EOF
+ else
+ return r.push(new Buffer('x'));
+ };
+
+ var results = [];
+ function flow() {
+ var chunk;
+ while (null !== (chunk = r.read()))
+ results.push(chunk + '');
+ }
+ r.on('readable', flow);
+ r.on('end', function() {
+ results.push('EOF');
+ });
+ flow();
+
+ process.on('exit', function() {
+ assert.deepEqual(results, [ 'eHh4', 'eHg=', 'EOF' ]);
+ console.log('ok');
+ });
+}