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Binary library

Lets you download files as a binary stream, and upload them as multipart/form-data. Userscript library.

This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/7079/28932/Binary%20library.js 

// ==UserScript==
// @name		Binary library
// @namespace	shoecream@luelinks.net
// @description	Lets you download files as a binary stream, and upload them as multipart/form-data. Userscript library.
// @include		*
// @grant		GM_xmlhttpRequest
// @license		cc-by-sa
// ==/UserScript==

BinaryRes = {};

BinaryRes.get = function (object)
 {
	var request = 
	{
		method: 'GET',
		url: object.url,
		overrideMimeType: 'text/plain; charset=x-user-defined',
		binary: true,
		onload: object.callback,
	};

	if (object.override) 
	{
		for (var attr in object.override) request[attr] = object.override[attr]
	}

	GM_xmlhttpRequest(request);
}

BinaryRes._clean = function (bytes) 
{
	var binarray = [];
	[].forEach.call(bytes, function (byte) 
	{
		binarray.push(String.fromCharCode(byte.charCodeAt(0) & 0xff));
	});
	return binarray.join('');
}

BinaryRes._bound = function()
 {
	var z = 98729145294692;
	var a = 12400722650394;
	return Array(28).join('-') + Math.floor(Math.random() * (z - a)) + a;
}

BinaryRes._typeof = function(value) {
	// from crockford
	var s = typeof value;
	if (s === 'object') {
		if (value) {
			if (typeof value.length === 'number' &&
				!(value.propertyIsEnumerable('length')) &&
				typeof value.splice === 'function') {
				s = 'array';
			}
		} else {
			s = 'null';
		}
	}
	return s;
}

BinaryRes.post = function (obj) 
{
	// url, callback, data
	var build = [];
	var boundary = BinaryRes._bound();
	for (var name in obj.data)
	 {
		if (obj.data.hasOwnProperty(name))
		{
			build.push('--' + boundary);
			var disp = 'Content-Disposition: form-data; name="' + name + '"';
			if (BinaryRes._typeof(obj.data[name]) == 'object')
			 {
				var value = BinaryRes._clean(obj.data[name].value);
				if (obj.data[name].filename)
					disp += '; filename="' + obj.data[name].filename + '"';
				build.push(disp);
				build.push('Content-type: ' + obj.data[name].type);
			} else 
			{
				var value = obj.data[name];
				build.push(disp);
			}
			build.push('');
			build.push(value);
		}
	}
	build.push('--' + boundary + '--');
	var data = build.join('\r\n');
	var request = 
	{
		method: 'POST',
		url: obj.url,
		binary: true,
		headers: 
		{
			"Content-Type": 'multipart/form-data; boundary=' + boundary,
			"Content-Length": data.length
		},
		data: data,
		onload: obj.callback
	};
	if (obj.override) 
	{
		for (var attr in obj.override) request[attr] = obj.override[attr]
	}
	GM_xmlhttpRequest(request);
}

BinaryRes.guessType = function(stream) 
{
	if (!stream) return;
	var dict = 
	[
		[0, 3, '\xFF\xD8\xFF', 'image/jpeg'],
		[1, 4, 'PNG', 'image/png'],
		[0, 3, 'GIF', 'image/gif'],
		[0, 4, '%PDF', 'application/pdf'],
	]
	stream = BinaryRes._clean(stream);
	for (var ii = 0; ii < dict.length; ii++) 
	{
		if (stream.slice(dict[ii][0], dict[ii][1]) === dict[ii][2])
			return dict[ii][3];
	}
}