Add node modules and compiled JavaScript from main (#54)

Co-authored-by: Oliver King <oking3@uncc.edu>

node_modules/stream-buffers/lib/readable_streambuffer.js

@@ -0,0 +1,114 @@
+'use strict';
+
+var stream = require('stream');
+var constants = require('./constants');
+var util = require('util');
+
+var ReadableStreamBuffer = module.exports = function(opts) {
+  var that = this;
+  opts = opts || {};
+
+  stream.Readable.call(this, opts);
+
+  this.stopped = false;
+
+  var frequency = opts.hasOwnProperty('frequency') ? opts.frequency : constants.DEFAULT_FREQUENCY;
+  var chunkSize = opts.chunkSize || constants.DEFAULT_CHUNK_SIZE;
+  var initialSize = opts.initialSize || constants.DEFAULT_INITIAL_SIZE;
+  var incrementAmount = opts.incrementAmount || constants.DEFAULT_INCREMENT_AMOUNT;
+
+  var size = 0;
+  var buffer = new Buffer(initialSize);
+  var allowPush = false;
+
+  var sendData = function() {
+    var amount = Math.min(chunkSize, size);
+    var sendMore = false;
+
+    if (amount > 0) {
+      var chunk = null;
+      chunk = new Buffer(amount);
+      buffer.copy(chunk, 0, 0, amount);
+
+      sendMore = that.push(chunk) !== false;
+      allowPush = sendMore;
+
+      buffer.copy(buffer, 0, amount, size);
+      size -= amount;
+    }
+
+    if(size === 0 && that.stopped) {
+      that.push(null);
+    }
+
+    if (sendMore) {
+      sendData.timeout = setTimeout(sendData, frequency);
+    }
+    else {
+      sendData.timeout = null;
+    }
+  };
+
+  this.stop = function() {
+    if (this.stopped) {
+      throw new Error('stop() called on already stopped ReadableStreamBuffer');
+    }
+    this.stopped = true;
+
+    if (size === 0) {
+      this.push(null);
+    }
+  };
+
+  this.size = function() {
+    return size;
+  };
+
+  this.maxSize = function() {
+    return buffer.length;
+  };
+
+  var increaseBufferIfNecessary = function(incomingDataSize) {
+    if((buffer.length - size) < incomingDataSize) {
+      var factor = Math.ceil((incomingDataSize - (buffer.length - size)) / incrementAmount);
+
+      var newBuffer = new Buffer(buffer.length + (incrementAmount * factor));
+      buffer.copy(newBuffer, 0, 0, size);
+      buffer = newBuffer;
+    }
+  };
+
+  var kickSendDataTask = function () {
+    if (!sendData.timeout && allowPush) {
+      sendData.timeout = setTimeout(sendData, frequency);
+    }
+  }
+
+  this.put = function(data, encoding) {
+    if (that.stopped) {
+      throw new Error('Tried to write data to a stopped ReadableStreamBuffer');
+    }
+
+    if(Buffer.isBuffer(data)) {
+      increaseBufferIfNecessary(data.length);
+      data.copy(buffer, size, 0);
+      size += data.length;
+    }
+    else {
+      data = data + '';
+      var dataSizeInBytes = Buffer.byteLength(data);
+      increaseBufferIfNecessary(dataSizeInBytes);
+      buffer.write(data, size, encoding || 'utf8');
+      size += dataSizeInBytes;
+    }
+
+    kickSendDataTask();
+  };
+
+  this._read = function() {
+    allowPush = true;
+    kickSendDataTask();
+  };
+};
+
+util.inherits(ReadableStreamBuffer, stream.Readable);