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diff --git a/plugins/cordova-plugin-file/www/FileWriter.js b/plugins/cordova-plugin-file/www/FileWriter.js
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+++ b/plugins/cordova-plugin-file/www/FileWriter.js
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+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+*/
+
+var exec = require('cordova/exec'),
+    FileError = require('./FileError'),
+    ProgressEvent = require('./ProgressEvent');
+
+/**
+ * This class writes to the mobile device file system.
+ *
+ * For Android:
+ *      The root directory is the root of the file system.
+ *      To write to the SD card, the file name is "sdcard/my_file.txt"
+ *
+ * @constructor
+ * @param file {File} File object containing file properties
+ * @param append if true write to the end of the file, otherwise overwrite the file
+ */
+var FileWriter = function(file) {
+    this.fileName = "";
+    this.length = 0;
+    if (file) {
+        this.localURL = file.localURL || file;
+        this.length = file.size || 0;
+    }
+    // default is to write at the beginning of the file
+    this.position = 0;
+
+    this.readyState = 0; // EMPTY
+
+    this.result = null;
+
+    // Error
+    this.error = null;
+
+    // Event handlers
+    this.onwritestart = null;   // When writing starts
+    this.onprogress = null;     // While writing the file, and reporting partial file data
+    this.onwrite = null;        // When the write has successfully completed.
+    this.onwriteend = null;     // When the request has completed (either in success or failure).
+    this.onabort = null;        // When the write has been aborted. For instance, by invoking the abort() method.
+    this.onerror = null;        // When the write has failed (see errors).
+};
+
+// States
+FileWriter.INIT = 0;
+FileWriter.WRITING = 1;
+FileWriter.DONE = 2;
+
+/**
+ * Abort writing file.
+ */
+FileWriter.prototype.abort = function() {
+    // check for invalid state
+    if (this.readyState === FileWriter.DONE || this.readyState === FileWriter.INIT) {
+        throw new FileError(FileError.INVALID_STATE_ERR);
+    }
+
+    // set error
+    this.error = new FileError(FileError.ABORT_ERR);
+
+    this.readyState = FileWriter.DONE;
+
+    // If abort callback
+    if (typeof this.onabort === "function") {
+        this.onabort(new ProgressEvent("abort", {"target":this}));
+    }
+
+    // If write end callback
+    if (typeof this.onwriteend === "function") {
+        this.onwriteend(new ProgressEvent("writeend", {"target":this}));
+    }
+};
+
+/**
+ * Writes data to the file
+ *
+ * @param data text or blob to be written
+ */
+FileWriter.prototype.write = function(data) {
+
+    var that=this;
+    var supportsBinary = (typeof window.Blob !== 'undefined' && typeof window.ArrayBuffer !== 'undefined');
+    var isProxySupportBlobNatively = (cordova.platformId === "windows8" || cordova.platformId === "windows");
+    var isBinary;
+
+    // Check to see if the incoming data is a blob
+    if (data instanceof File || (!isProxySupportBlobNatively && supportsBinary && data instanceof Blob)) {
+        var fileReader = new FileReader();
+        fileReader.onload = function() {
+            // Call this method again, with the arraybuffer as argument
+            FileWriter.prototype.write.call(that, this.result);
+        };
+        if (supportsBinary) {
+            fileReader.readAsArrayBuffer(data);
+        } else {
+            fileReader.readAsText(data);
+        }
+        return;
+    }
+
+    // Mark data type for safer transport over the binary bridge
+    isBinary = supportsBinary && (data instanceof ArrayBuffer);
+    if (isBinary && cordova.platformId === "windowsphone") {
+        // create a plain array, using the keys from the Uint8Array view so that we can serialize it
+        data = Array.apply(null, new Uint8Array(data));
+    }
+
+    // Throw an exception if we are already writing a file
+    if (this.readyState === FileWriter.WRITING) {
+        throw new FileError(FileError.INVALID_STATE_ERR);
+    }
+
+    // WRITING state
+    this.readyState = FileWriter.WRITING;
+
+    var me = this;
+
+    // If onwritestart callback
+    if (typeof me.onwritestart === "function") {
+        me.onwritestart(new ProgressEvent("writestart", {"target":me}));
+    }
+
+    // Write file
+    exec(
+        // Success callback
+        function(r) {
+            // If DONE (cancelled), then don't do anything
+            if (me.readyState === FileWriter.DONE) {
+                return;
+            }
+
+            // position always increases by bytes written because file would be extended
+            me.position += r;
+            // The length of the file is now where we are done writing.
+
+            me.length = me.position;
+
+            // DONE state
+            me.readyState = FileWriter.DONE;
+
+            // If onwrite callback
+            if (typeof me.onwrite === "function") {
+                me.onwrite(new ProgressEvent("write", {"target":me}));
+            }
+
+            // If onwriteend callback
+            if (typeof me.onwriteend === "function") {
+                me.onwriteend(new ProgressEvent("writeend", {"target":me}));
+            }
+        },
+        // Error callback
+        function(e) {
+            // If DONE (cancelled), then don't do anything
+            if (me.readyState === FileWriter.DONE) {
+                return;
+            }
+
+            // DONE state
+            me.readyState = FileWriter.DONE;
+
+            // Save error
+            me.error = new FileError(e);
+
+            // If onerror callback
+            if (typeof me.onerror === "function") {
+                me.onerror(new ProgressEvent("error", {"target":me}));
+            }
+
+            // If onwriteend callback
+            if (typeof me.onwriteend === "function") {
+                me.onwriteend(new ProgressEvent("writeend", {"target":me}));
+            }
+        }, "File", "write", [this.localURL, data, this.position, isBinary]);
+};
+
+/**
+ * Moves the file pointer to the location specified.
+ *
+ * If the offset is a negative number the position of the file
+ * pointer is rewound.  If the offset is greater than the file
+ * size the position is set to the end of the file.
+ *
+ * @param offset is the location to move the file pointer to.
+ */
+FileWriter.prototype.seek = function(offset) {
+    // Throw an exception if we are already writing a file
+    if (this.readyState === FileWriter.WRITING) {
+        throw new FileError(FileError.INVALID_STATE_ERR);
+    }
+
+    if (!offset && offset !== 0) {
+        return;
+    }
+
+    // See back from end of file.
+    if (offset < 0) {
+        this.position = Math.max(offset + this.length, 0);
+    }
+    // Offset is bigger than file size so set position
+    // to the end of the file.
+    else if (offset > this.length) {
+        this.position = this.length;
+    }
+    // Offset is between 0 and file size so set the position
+    // to start writing.
+    else {
+        this.position = offset;
+    }
+};
+
+/**
+ * Truncates the file to the size specified.
+ *
+ * @param size to chop the file at.
+ */
+FileWriter.prototype.truncate = function(size) {
+    // Throw an exception if we are already writing a file
+    if (this.readyState === FileWriter.WRITING) {
+        throw new FileError(FileError.INVALID_STATE_ERR);
+    }
+
+    // WRITING state
+    this.readyState = FileWriter.WRITING;
+
+    var me = this;
+
+    // If onwritestart callback
+    if (typeof me.onwritestart === "function") {
+        me.onwritestart(new ProgressEvent("writestart", {"target":this}));
+    }
+
+    // Write file
+    exec(
+        // Success callback
+        function(r) {
+            // If DONE (cancelled), then don't do anything
+            if (me.readyState === FileWriter.DONE) {
+                return;
+            }
+
+            // DONE state
+            me.readyState = FileWriter.DONE;
+
+            // Update the length of the file
+            me.length = r;
+            me.position = Math.min(me.position, r);
+
+            // If onwrite callback
+            if (typeof me.onwrite === "function") {
+                me.onwrite(new ProgressEvent("write", {"target":me}));
+            }
+
+            // If onwriteend callback
+            if (typeof me.onwriteend === "function") {
+                me.onwriteend(new ProgressEvent("writeend", {"target":me}));
+            }
+        },
+        // Error callback
+        function(e) {
+            // If DONE (cancelled), then don't do anything
+            if (me.readyState === FileWriter.DONE) {
+                return;
+            }
+
+            // DONE state
+            me.readyState = FileWriter.DONE;
+
+            // Save error
+            me.error = new FileError(e);
+
+            // If onerror callback
+            if (typeof me.onerror === "function") {
+                me.onerror(new ProgressEvent("error", {"target":me}));
+            }
+
+            // If onwriteend callback
+            if (typeof me.onwriteend === "function") {
+                me.onwriteend(new ProgressEvent("writeend", {"target":me}));
+            }
+        }, "File", "truncate", [this.localURL, size]);
+};
+
+module.exports = FileWriter;