Ransomware in your inbox: the rise of malicious JavaScript attachments

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The responseType property of the XMLHttpRequest object can be set to change the expected response type from the server. Possible values are the empty string default"arraybuffer""blob""document""json"and "text". This is null if the request is not complete or was not successful.

This example reads an image as a binary file and creates an 8-bit unsigned integer array from the raw bytes. Note that this will not decode the image and read the pixels. You will need a png decoding library for that. An alternative to the above method utilizes the Blob interface to directly construct a Blob with the arraybuffer data.

Also you can read a binary file as a Blob by setting the string "blob" to the responseType property. The magic happens in line 5, which overrides the MIME type, forcing the browser to treat it as plain text, using a user-defined character set. This tells wsh how can i read a binary file with in javascript cscriptexe browser not to parse it, and to let the bytes pass through unprocessed. The example above fetches the byte at offset x within the loaded binary data.

The valid range for x is from 0 to filestream. See also downloading files. The following example sends creates a text file on-the-fly and uses the POST method to send the "file" to the server. This example uses plain text, but you can imagine the data being a binary file instead. This is building a byte array of 8-bit integers and sending it; you can use any binary data you'd like, of course.

Please, read this paragraph. Line 4 sets the Content-Length header toindicating that the data is bytes long. Obviously you need to change this value based on the actual size of the data being sent.

You can also send binary content by passing an instance of the nsIFileInputStream to send. In that case, you don't have to set the Content-Length header yourself, as the information is fetched from the stream automatically:. Get the latest and greatest from MDN delivered straight to your inbox. Please check your inbox or your spam filter for an wsh how can i read a binary file with in javascript cscriptexe from us. Receiving binary data using JavaScript typed arrays The responseType property of the XMLHttpRequest object can be set to change the expected response type from the server.

Add information about other browsers' support here. The standard send Blob data method can be used instead as explained above. Document Tags and Contributors Tags: Contributors to this page: Learn the best of web development Get the latest and greatest from MDN delivered straight to your inbox. I'm okay with Mozilla handling my info as explained in this Privacy Policy. Please check your inbox to confirm your subscription.

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See Javascript from the command line to learn about doing this with Rhino; you can also do it with node. I recently had to write a script that would make global replacements in a text file on a client's machine. Much as I love python I look forward to telling you about the fun I'm having with python-calais , it was one of those tasks that just cried out "perl".

Unfortunately, I couldn't take perl's existence for granted on the client's computers, and having them install it was too much trouble. I could, however, take everything in a typical Windows installation for granted, and it turned out that Microsoft's JScript implementation of Javascript could do everything I needed.

VBScript equivalents of what I describe here shouldn't be much different. With Javascript's roots as a web scripting language, I knew that safety reasons prevented it from having a lot of file input and especially output capabilities, but I learned that not only are these fairly easy, they can be done with standard input and output, so that a command in a batch file can pipe content through JScript scripts just like it can with perl or python scripts.

The Windows utility that lets you run scripts from the command line is called cscript. It assumes that a script file with an extension of "js" is a JScript program, although it can run VBScript programs as well.

The following script performs a global replacement using the target and replacement strings passed as command line parameters. It demonstrates a few nice things:. Echo writes to standard output. CScript is essentially a less-GUI oriented version of the wscript.

The WScript object has a StdIn method to read from standard input. Arguments stores the command line parameters used when invoking the script. You can use regular expressions with UNIXy syntax. To use a variable such as target in a regular expression, you need the RegExp object, as the sample script demonstrates, but the comment preceding that line shows how a hardcoded regular expression would not need this object.

Several other parameters are available. Between the string manipulation functions and the regular expression, standard input, and standard output support, this combination of the cscript engine and the J ava Script programming language gives all Windows machines a powerful text processing tool right out of the box.

I guess you could run RDF stuff in a single-file too, using http: Haven't played with this at all yet, am mostly MacoSX-based lately, where addressbook and pubsub APIs are getting my attention lately. Is it possible to access the equivalent in Windows from.

I love awk, and actually pulled out my little gray book just recently--it's one of the few books that I ever owned two copies of so that I could keep one at work and one at home. It's certainly easier to install than perl, but for the situation I described above, I was better off not telling this client to download and install anything.

Windows command line text processing with Javascript 22 April Or, technically, with JScript. Between the the string manipulation functions and the regular expression, standard input, and standard output support, the combination of cscript and JScript gives all Windows machines a powerful text processing tool right out of the box.

It demonstrates a few nice things: Item 1 ; while! By orlando on April 23, I would suggest you to use awk By Bob DuCharme on April 23,