/*
* FormData for XMLHttpRequest 2 - Polyfill for Web Worker
* (c) 2014 Rob Wu <rob@robwu.nl>
* License: MIT
* - append(name, value[, filename])
* - XMLHttpRequest.prototype.send(object FormData)
*
* Specification: http://www.w3.org/TR/XMLHttpRequest/#formdata
* http://www.w3.org/TR/XMLHttpRequest/#the-send-method
* The .append() implementation also accepts Uint8Array and ArrayBuffer objects
* Web Workers do not natively support FormData:
* http://dev.w3.org/html5/workers/#apis-available-to-workers
* Originally released in 2012 as a part of http://stackoverflow.com/a/10002486.
* Updates since initial release:
* - Forward-compatibility by testing whether FormData exists before defining it.
* - Increased robustness of .append.
* - Allow any typed array in .append.
* - Remove use of String.prototype.toString to work around a Firefox bug.
* - Use typed array in xhr.send instead of arraybuffer to get rid of deprecation
* warnings.
**/
(function(exports) {
if (exports.FormData) {
// Don't replace FormData if it already exists
return;
}
// Export variable to the global scope
exports.FormData = FormData;

var ___send$rw = XMLHttpRequest.prototype.send;
XMLHttpRequest.prototype.send = function(data) {
if (data instanceof FormData) {
if (!data.__endedMultipart) data.__append('--' + data.boundary + '--\r\n');
data.__endedMultipart = true;
this.setRequestHeader('Content-Type', 'multipart/form-data; boundary=' + data.boundary);
data = new Uint8Array(data.data);
}
// Invoke original XHR.send
return ___send$rw.call(this, data);
};

function FormData() {
// Force a Constructor
if (!(this instanceof FormData)) return new FormData();
// Generate a random boundary - This must be unique with respect to the form's contents.
this.boundary = '------RWWorkerFormDataBoundary' + Math.random().toString(36);
var internal_data = this.data = [];
/**
* Internal method.
* @param inp String | ArrayBuffer | Uint8Array Input
*/
this.__append = function(inp) {
var i = 0, len;
if (typeof inp == 'string') {
for (len = inp.length; i < len; ++i)
internal_data.push(inp.charCodeAt(i) & 0xff);
} else if (inp && inp.byteLength) {/*If ArrayBuffer or typed array */
if (!('byteOffset' in inp)) /* If ArrayBuffer, wrap in view */
inp = new Uint8Array(inp);
for (len = inp.byteLength; i < len; ++i)
internal_data.push(inp[i] & 0xff);
}
};
}
/**
* @param name String Key name
* @param value String|Blob|File|typed array|ArrayBuffer Value
* @param filename String Optional File name (when value is not a string).
**/
FormData.prototype.append = function(name, value, filename) {
if (this.__endedMultipart) {
// Truncate the closing boundary
this.data.length -= this.boundary.length + 6;
this.__endedMultipart = false;
}
if (arguments.length < 2) {
throw new SyntaxError('Not enough arguments');
}
var part = '--' + this.boundary + '\r\n' +
'Content-Disposition: form-data; name="' + name + '"';

if (value instanceof File || value instanceof Blob) {
return this.append(name,
new Uint8Array(new FileReaderSync().readAsArrayBuffer(value)),
filename || value.name);
} else if (typeof value.byteLength == 'number') {
// Duck-typed typed array or array buffer
part += '; filename="'+ (filename || 'blob').replace(/"/g,'%22') +'"\r\n';
part += 'Content-Type: application/octet-stream\r\n\r\n';
this.__append(part);
this.__append(value);
part = '\r\n';
} else {
part += '\r\n\r\n' + value + '\r\n';
}
this.__append(part);
};
})(this || self);