Current Dev State

static/js/ketcher2/node_modules/browserify-zlib/test/test-zlib-random-byte-pipes.js

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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 crypto = require('crypto');
+var stream = require('stream');
+var Stream = stream.Stream;
+var util = require('util');
+var tape = require('tape');
+var zlib = require('../');
+
+
+
+// emit random bytes, and keep a shasum
+function RandomReadStream(opt) {
+  Stream.call(this);
+
+  this.readable = true;
+  this._paused = false;
+  this._processing = false;
+
+  this._hasher = crypto.createHash('sha1');
+  opt = opt || {};
+
+  // base block size.
+  opt.block = opt.block || 256 * 1024;
+
+  // total number of bytes to emit
+  opt.total = opt.total || 256 * 1024 * 1024;
+  this._remaining = opt.total;
+
+  // how variable to make the block sizes
+  opt.jitter = opt.jitter || 1024;
+
+  this._opt = opt;
+
+  this._process = this._process.bind(this);
+
+  process.nextTick(this._process);
+}
+
+util.inherits(RandomReadStream, Stream);
+
+RandomReadStream.prototype.pause = function() {
+  this._paused = true;
+  this.emit('pause');
+};
+
+RandomReadStream.prototype.resume = function() {
+  this._paused = false;
+  this.emit('resume');
+  this._process();
+};
+
+RandomReadStream.prototype._process = function() {
+  if (this._processing) return;
+  if (this._paused) return;
+
+  this._processing = true;
+
+  if (!this._remaining) {
+    this._hash = this._hasher.digest('hex').toLowerCase().trim();
+    this._processing = false;
+
+    this.emit('end');
+    return;
+  }
+
+  // figure out how many bytes to output
+  // if finished, then just emit end.
+  var block = this._opt.block;
+  var jitter = this._opt.jitter;
+  if (jitter) {
+    block += Math.ceil(Math.random() * jitter - (jitter / 2));
+  }
+  block = Math.min(block, this._remaining);
+  var buf = new Buffer(block);
+  for (var i = 0; i < block; i++) {
+    buf[i] = Math.random() * 256;
+  }
+
+  this._hasher.update(buf);
+
+  this._remaining -= block;
+
+  this._processing = false;
+
+  this.emit('data', buf);
+  process.nextTick(this._process);
+};
+
+
+// a filter that just verifies a shasum
+function HashStream() {
+  Stream.call(this);
+
+  this.readable = this.writable = true;
+  this._hasher = crypto.createHash('sha1');
+}
+
+util.inherits(HashStream, Stream);
+
+HashStream.prototype.write = function(c) {
+  // Simulate the way that an fs.ReadStream returns false
+  // on *every* write like a jerk, only to resume a
+  // moment later.
+  this._hasher.update(c);
+  process.nextTick(this.resume.bind(this));
+  return false;
+};
+
+HashStream.prototype.resume = function() {
+  this.emit('resume');
+  process.nextTick(this.emit.bind(this, 'drain'));
+};
+
+HashStream.prototype.end = function(c) {
+  if (c) {
+    this.write(c);
+  }
+  this._hash = this._hasher.digest('hex').toLowerCase().trim();
+  this.emit('data', this._hash);
+  this.emit('end');
+};
+
+tape('random byte pipes', function(t) {
+  var inp = new RandomReadStream({ total: 1024, block: 256, jitter: 16 });
+  var out = new HashStream();
+  var gzip = zlib.createGzip();
+  var gunz = zlib.createGunzip();
+
+  inp.pipe(gzip).pipe(gunz).pipe(out);
+
+  inp.on('data', function(c) {
+    t.ok(c.length);
+  });
+
+  gzip.on('data', function(c) {
+    t.ok(c.length);
+  });
+
+  gunz.on('data', function(c) {
+    t.ok(c.length);
+  });
+
+  out.on('data', function(c) {
+    t.ok(c.length);
+  });
+
+  out.on('data', function(c) {
+    t.ok(c.length);
+    t.equal(c, inp._hash, 'hashes should match');
+  });
+  
+  out.on('end', function() {
+    t.end();
+  })
+});
+