Apologies if this is a basic question, i'm a very casual programmer.
I'm writing a program which will search for torrents, grab them based on certain criteria (one being that they are indicated as freeware, you'll be pleased to hear) and then throw them over to utorrent. I'm getting stuck downloading the .torrent file, because, I believe, of the encoding.
I've worked out thus far that the bulk of the top of the file can be gzip deflated on the fly using HTTPrequest - but it seems that half-way through the file, something changes - and looking in a hex editor at a .torrent i've grabbed from a site directly versus the one I download here, everything is identical up to a point, then all is totally different.
If i'm being vague i'm afraid it's because i'm making this all up as I go along! Is it likely that the encoding / compression in a torrent file would change part way through, and how could I catch this in VB to avoid corrupting the latter half?
Thanks very much in advance,
Dan
Related
I am writing a script with a lot of modules but I don't really want the user to see my source code so I figured to encode everything in base64 since the user won't be able to decode it even if it is that basic.
I tried to somehow add an encoded module but no luck.
So my question is -
Is it possible to import a base64 encoded module to the main script file?
If you have any better solutions to hide source code please share, I would be more than happy to try them out.
P.S. I tried to find some info on making a .dll files but found out I would have to rewrite the script in C#. (if I didn't missed anything)
Also I tried to put all modules into one encoded file, but then the file gets too big and Powershell is not able to process it anymore.
You've got two options, which can be combined if you would like to be extremely sure that no one will be able to access your code, making your code into an exe was already mentioned, there are several projects to do this but This one is nice as it is wholly contained within PS. The other, imo better, method is to use an obfuscator, which will take your code and replace variable names with nonsense strings and make other changes to make your code very difficult to read, it's still possible to work out your code but generally not worth the effort, you can find a working one Here. But I do have to add that obfuscating your code really goes against the powershell ethos and I recommend against doing it unless you have some sort of requirement too being passed down from management. And please note that this NOT an acceptable method of obscuring code that includes passwords, api keys, or any other information that needs to be secured as all of those are quite easy to extract from code that has been obfuscated this way.
You could change your ps1 to an exe file by using
https://ps2exe.codeplex.com/
You'd still be able to get at the code if you tried, but it would prevent a casual look.
Why do you want to hide the modules?
I think a student of mine renamed a PNG a Word document and intentionally submitted a corrupted file to buy more time (or something) on an assignment. The student denies everything and claims it was a computer malfunction. Before I submit an honor code violation I want to be sure that there's no explanation that does not involve cheating that I'm somehow overlooking.
Basically, I'm a TA and a student submitted a paper, let's say it was Smith.docx. When I was working on grading and went to open Smith.docx Word wouldn't open it and said that it was corrupted. I eventually had the idea of opening it in a text editor and there it was a massive jumbled file of all sorts of odd characters (total file size: 180kb for what was supposed to be a 5 page paper).
I noticed, though, that the first few characters of the file were:
‰PNG
I renamed the file Smith.png and it opened. Bizarrely, it was an image of the first page of a Word document. More specifically, it looks like a screenshot of a Word doc cropped so as to show just the page. What makes it seem like a screenshot is that the cursor thingy (the vertical bar marking where you're typing) shows up next to the title.
An additional interesting bit of data is that if I scroll further down in the file (opened in notepad) I come to this:
XML:com.adobe.xmp <x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 5.4.0">
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
<rdf:Description rdf:about=""
xmlns:exif="http://ns.adobe.com/exif/1.0/">
<exif:PixelXDimension>996</exif:PixelXDimension>
<exif:PixelYDimension>1286</exif:PixelYDimension>
</rdf:Description>
</rdf:RDF>
</x:xmpmeta>
I'm not sure what all that means but 1286x996 are the dimensions of the png image. The rest suggests to me that the file was created in some Adobe program but I'm not sure if that's right and how to figure out more about that.
So, my actual question: Is there any conceivable explanation of any kind for how I would come to have a file called Smith.docx that is a perfectly functioning png of what sure looks like a screenshot of the first page of a Word document other than that the student did it on purpose? The student claimed that their computer was "corrupting" files and that they had to take it into the Apple for service. I find this incredibly implausible (student has also not provided the receipt for this, which I requested).
Additionally, other than the case I laid out here, is there any positive evidence for my theory (that it was a straightforward case of cheating) that I can present to strengthen my case? eg, is the data from the file that I posted above a smoking gun that it was created in an Adobe program or is there any conceivable way that could come out of a Word document or other sort of corrupted file?
Also, is there anything else I can look for in the PNG file that would be a smoking gun?
Thanks in advance for any help you might be able to offer!
just rename the file with .png at the end instead of .docx and if it was a png then it should open just fine as a png
The key is that you see the cursor in the screenshot, there is no way Word would export (somehow) a docx file as a png AND draw the cursor for typing. Also, any tool that could do that would save the file as png not docx, only the user could deliberately change the file extension.
Also, does the screenshot show an empty document? or it looks like the final document your student delivered at the end?
Short answer:
The student is lying and is in fact a cheater (in my opinion).
Also, even if they were telling the truth, it is still their responsibility to have their work done, ready, and fully functional on time. Your computer is corrupting your files? Tough cookies. No one cares. You should have done your work on another computer. In the real world, excuses don't get you anywhere and they shouldn't get you anywhere in school either.
Lastly, it is very easy to re-name an extension of another file type and claim it's corrupt and very unlikely that a computer is just creating corrupted files. If their computer would otherwise create corrupted files, I would imagine it would be nearly impossible to get the computer to boot. In other words, they probably wouldn't have been able to turn on their "corrupted" computer to create "corrupted" files in the first place.
So I'm brand spanking new to iTextSharp and I know I have quite a bit of reading ahead of me but in an attempt to shave a bunch of time off a relatively trivial task I thought I reach out the stack brain-trust.
I have a very simple goal: Starting with a template pdf, I need to create new pdf with a few of the characters changed. We're talking single characters on each page. I don't need a detailed answer complete with code (although that'd be awesome) so much as a general list of tools and api's I'm going to need.
The data I need will already be in a db which I could output to xml files if need be.
So far it looks like my template will need the "editable" characters tagged somehow (not sure how to do that yet) and using PDFStamper I can modify the copy. Is that the right path or is there a better way?
Thanks for any insight.
Alright, what I need is a command-line application that allows you to take a screenshot of a file's audio stream.
For example it should be run like this:
app.exe "C:/artist-title.mp3" "C:/mp3Stream.jpg"
app.exe "C:/artist-title.wav" "C:/wavStream.jpg"
It only has to be able to capture mp3 streams, other streams are a bonus.
Preferably all audio channels are listed in the image, but if all channels are combined into one mono stream it would work just as good for me.
So, is there such a application out there? So that I don't re-invent the wheel.
If not does anyone have tips on how I should go about writing such a application myself? Preferably in Java. I can handle programming pretty well but I'm not exactly an expert on the MP3/WAV formats.
Why do I need it...? Well, it's more fun to link to a file online with some sort of preview image besides the link. It gives you a hint of the audio character before you listen to it (is it loud? does it look like "bit music"? does it have any parts that are more quiet than others? etc).
Never mind, I wrote my own little application in Java.
It was a piece of cake once I found this excellent guide:
http://codeidol.com/java/swing/Audio/Build-an-Audio-Waveform-Display/
Although you can't download the source from that page (as far as I can tell, though he makes it apparent that you should be able to) he does provide some very useful key lines of code that makes it easy to puzzle together the application.
Adding a little bit of help (easy stuff). You can get a graphics object from doing so:
BufferedImage img = new BufferedImage(500, 100, BufferedImage.TYPE_INT_RGB);
Graphics2D gfx = (Graphics2D) img.getGraphics();
And once you have drawn everything you need on the gfx you can save it to disk just by one line:
ImageIO.write(img, "jpg", new File("waveform.png"));
It's hard to get it to look very good though. Doesn't look as nice as for example Audacity. Guess they have spent more time on it than a few hours though.
The biggest pain about this is however that Java don't support MP3 import. They really should get around to that.
So to get the waveform of MP3s I first convert them into WAV using "javazoom.jl.decoder.Decoder.java", it's on their website. Very easy to use, just give the input path and the output path and it's done.
javazoom dot net (couldn't post more than one "hyperlink" on this website)
The big downside of this is of course that a huuge WAV file has to be created, and woe be unto thee if the MP3 happens to be 15 minutes or so... The WAV will be over 100 MiB (maybe even 200 MiB, haven't found out since I got a Java-out-of-memory-error, even though I gave the VM 512mb).
MP3 support in Java today please. Guess the reason they don't have it is because of copyright issues. Copyright really is slowing man down.
Also take a look at http://www.jsresources.org/
It provides a pretty good FAQ section about everything Audio in Java, and some example applications.
I would like to create my own data format for an iPhone app. The files should be similar structured as e.g. Apple's iWork files (.pages). That means, I have a folder with some files in it:
The file 'Juicy.fruit' contains:
Fruits
---> Apple.xml
---> Banana.xml
---> Pear.xml
---> PreviewPicture.png
This folder "Fruits" should be packed in a handy file 'Juicy.fruit'. Compression isn't necessary. How could I achieve this? I've discovered some open source ZIP-libraries. However, I would like to to build my own data format with the iPhones built-in libs (if possible).
Best regards,
Stefan
Okay, so there are three ways I am reading your question, here's my best guess on each one:
You want your .fruit files to be associated with your app via Safari/SMS/some network connection (aka when someone wants to download files made for your app or made by your app).
In this case, you can register a protocol for your app, as discussed here:
iPhone file extension app association
You want the iPhone to globally associate .fruit files with your app, in which case you want to look into Uniform Type Identifiers. Basically, you set up this association in your installer's info.plst file.
You want to know how you can go from having a folder with files in it to that folder being a single file (package) with your .fruit extension.
If that's the case, there are many options out there and I don't see a purpose in rolling your own. Both Microsoft and Adobe simply use a standard zip compression method and use their own extension (instead of .zip). If you drop any office 2007 document, such as docx or Adobe's experimental .pdfxml file into an archive utility (I like 7z, but any descent one will do), you will get a folder with several xml files, just like you're describing for your situation. (This is also how Java's jar file type works, fyi). So unless you have a great reason to avoid standard compression methods (I vote gzip), I would follow the industry lead on this one.
I can definitly appreciate the urge to go DIY at every level possible, but you're basically asking (if it's #3) how you can create your own packaging algorithm, and after reading how some of the most basic compression methods work, I would leave that one alone. Plus I really doubt that Apple has built in libraries for doing something that most people will just use standard methods for.
One last note:
If you are really gunning to do it from scratch (still suggest not), since your files are all XML, you could just create a new XML file that will act as a wrapper of sorts, and have each file go into that wrapper file. But this would be really redundant when it came time to unwrap, as it would have to load the whole file every time. But it would be something like:
Juicy.fruit --
<fruit-wrapper>
<fruit>
<apple>
... content from apple.xml
</apple>
</fruit>
<fruit>
<banana>
... content from banana.xml
</banana>
</fruit>
<fruit>
<pear>
... content from pear.xml
</pear>
</fruit>
<picture>
...URL-encoded binary of preview picture
</picture>
</fruit-wrapper>
But with this idea, you either have to choose to unpack it, and thus risk losing track of the files, overwriting some but not all, etc etc, or you always treat it like one big file, in which case, unlike with archives, you have to load all of the data each time to pull anything out, instead of just pulling the file you want from the archive.
But it could work, if you're determined.
Also, if you are interested, there is a transfer protocol intended specifically for XML over mobile called WBXML (Wap Binary XML). Not sure if it is still taken seriously, but if there is an iPhone library for it, you should research it.