What is this file type exactly and how does it differ from binary?
It seems to be automatically assigned to .zip and .jar files.
SOLVED
It turns out ubinary means uncompressed binary, and this makes sense since trying to further compress a .zip or .jar is pointless.
Related
Is there a way to scan a .jar file to see each step that the program takes? I just ask because I found a .jar file that will supposedly generate pdf files for me out of Tableau. Unfortunately, I am not familiar with the author of the .jar file and want to make sure that I'm not getting something I don't want.
I also have a similar issue with an .exe file. Is there a way to scan the .exe file to see the steps that it takes?
Yes to both.
Jar is easier, there are a few jar decompilers. Classy Shark is simple to use.
There's also the JetBrains decompiler org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler which makes a little cleaner code, but is more complex to install.
For exe files, it depends on how it was created, if it's .Net, then you can pull it apart pretty easily with ILSpy.
If the exe was written in something else, it gets much more complicated fast.
So, I decompressed an exe file and modified it, and I want to recompress it back to exe form, not an SFX archive.
I can't find an internet solution for my problem, all of the posts I look at talk about recompressing to an SFX file, which I do not want to do, I want to convert it to a fully working exe.
I think you are looking for IExpress.exe: https://www.maketecheasier.com/create-self-extracting-archives-without-installing-software/
Modifying a binary file without breaking it requires a knowledge of hex or assembly. You can't just decompress and compress it back.
How ever there are tools that has ability to make some minor changes to an exe file. This one is an example. Those tools can only alter exe file's resources like icons, some of the texts, images etc.
Hope this helped.
When using zipx with xz, zip format will be same, only compression method changes to 5F, right?
But my doubt is, when i want to compress a folder with multiple file, how does zip do it using xz? Because, xz only supports to compress one single file..
So winzip might have to do some operation to make the folder and its contents to a single file (operation like tar or cpio)
So what METHOD does it use to archieve all the files into a single one?
We tried to zip the folder with no compression to make it to one file, and apply xz on that, but we need to unzip twice to get the orginal folder.
How does zipx do it in one unzip?
The zip file format compresses each file individually. So it can use xz for that, no problem, which compresses one file. The zip format is individual file compression followed by archiving. Things like .tar.gz or .tar.xz are the opposite, which is archiving followed by compression of the entire archive.
Background (not necessary to read)
I'm tinkering with MS office files for work (trying to figure out the quickest, easiest way to automate generation of arbitrary-length excel and powerpoint files). Since actual excel files are just zipped archives with .xlsx appended to the filename, I've been unzipping them, editing the xml, rezipping them, and seeing whether OpenOffice can still load them.
However, I've realized (after not too much such testing, thankfully) that, by default, the 'zip' command in bash (or, at least, on my mac) is zipping the files in a format that only requires unzip v1.0 to extract, but normal excel files are zipped in such a way that they require v2.0 to extract. I checked this is a problem by zipping and unzipping an excel file that I knew loaded normally, and then trying to load it. OpenOffice was displeased.
So, I know I need to make the file zip exactly the way excel does, but how to make that happen I'm not sure. I have zip version 3 on my computer, so hopefully if the zip/unzip release cycles are synchronized it should be possible, but I didn't see anything on the man page that immediately seemed to be the solution.
edit:
And zip -9 (which zip -h helpfully says instructs zip to 'zip better') still only requires v1.0 to extract.
Question:
How can I specify in bash that I want zip to zip a file in such a way that it would require unzip v2.0 to unzip?
Often, the reason for an incompatibility between compressed files produced by different versions is the compression algorithm used. If the files were compressed with an algorithm that didn't exist in zip 1.0, that would cause the incompatibility you're seeing.
Look at the man page for your zip utility, see if there's an option to specify the type of compression to use. If there is, look at the existing files created from Excel, and find out what type of compression algorithm they're compressed with, and use that.
On my Linux system, zip reports "This is Zip 2.31 (March 8th 2005), by Info-ZIP.", and it does not have an option for specifying the compression algorithm. On my Windows system, 7-zip does have the option, and it looks like they do have a Mac version available, so you could try that if your zip utility doesn't support that option.
I want to distribute a cross-platform application for which the executable file is slightly different, depending on the user who downloaded it. This is done by having a placeholder string somewhere in the executable that is replaced with something user-specific upon download.
The webserver that has to do these string replacements is a Linux machine. For Windows, the executable is not compressed in the installer .exe, so the string replacement is easy.
For uncompressed Mac OS X .dmg files, this is also easy. However, .dmg files that are compressed with either gzip or bzip2 are not so easy. For example, in the latter case, the compressed .dmg is not one big bzip2-compressed disk image, but instead consists of a few different bzip2-compressed parts (with different block sizes) and a plist suffix. Also, decompressing and recompressing the different parts with bzip2 does not result in the original data, so I'm guessing Apple uses some different parameters to bzip2 than the command-line tool.
Is there a way to generate a compressed .dmg from an uncompressed one on Linux (which does not have hdiutil)? Or maybe another suggestion for creating customized applications without pregenerating them? It should work without any input by the user.
I realize that I'm a bit too late here, but we wanted to do exactly the same thing and got it to work using libdmg. https://github.com/planetbeing/libdmg-hfsplus
Basically, you can use libdmg to unpack a dmg file to an uncompressed file containing a hfs+ file system, play around with the files inside the hfs+ file system, and them put it back together again as a dmg file with the correct checksums.
If you use any fancy dmg features, like showing an EULA before the image is mounted, then these will not survive the process. Background images and so on work, though.
If your web server and client support the gzip encoding, then you can deal with uncompressed files on the server, but have them compressed / decompressed on the fly by the web server / web client respectively.
e.g. apache's mod_gzip.
Otherwise maybe you can split your dmg into 3 parts:
the stuff before what you want to replace
the string you want to replace
the stuff after what you want to replace
If the gzip stream is splittable at those points, you could just concatenate the front and back onto the gzipped string you want to replace. That would let you generate it on the fly.
Release a normal, read-only, compressed dmg. Then bundle your app in a package installer with a pre-flight script that sets the variables you need.