Read bytes from binary file

[rainbow-girl]

Hi

I'm opening a binary file in a HEX editor. In this file I want so save the first 8 bytes to another destination file.
I want to read this binary file by using C# code and save the first 8 bytes of the file to a destination binary file (that will contain only those 8 bytes), all by using C# code.

Can somebody please give me a code example that can do this?

Thanks so much!!!
Lisa

 

[Skydiver]

In that case, you do have the source code and the documentation. It was all part of that .ZIP file you had previously sent me.

 

[rainbow-girl]

Yes but it's source code I don't understand
I hope you want to help again because I will never find anybody else who will! The problem is reduced to the code of 1 tool (the encrypt and decrypt is ready because you explained it)

 

[Skydiver]

If you present the C struct here, that will pretty much inform us of how that file header is constructed and what lives in those "non-string data spread across more bytes".

 

[rainbow-girl]

hI

here is all source code

twilight-cd.com / sourcecode menu twilight 9 · GitLab

GitLab.com

gitlab.com

I want to understand how the TVF and ZIP files are stored in a THF file

Here is a THF file: Internet Archive: View Archive

Download the file MENU/TL09.THF

https://archive.org/download/twilight-warez-cd-pack-1-tm-89/Twilight009.iso/MENU%2FTL09.THF

Download the THF tool:

THF.EXE · master · twilight-cd.com / sourcecode menu twilight 9 · GitLab

GitLab.com

gitlab.com

Download the THF tool source code:

THF.C · master · twilight-cd.com / sourcecode menu twilight 9 · GitLab

GitLab.com

gitlab.com

You can run the tool THF.EXE on the file TL09.THF to see the content (you need DOSBox because it's a 16 bit MS-DOS EXE). It's this content I want to know: where and how a TVF and ZIP file is stored inside, so I can extract them using C# code. Indicated is the first ZIP file inside the THF file.
The encyption/decryption of TVF and ZIP files is completely known by me, because you explained me this the previous time.
I only need to know how I know where a TVF and ZIP file are inside the THF file and what C# code I need to extract the files. I then can decrypt them once I have the encrypted file extracted from the THF file.

DOSBox, an x86 emulator with DOS

www.dosbox.com

So to summarize: I want to make C# code that takes a THF file and extracts all TVF and ZIP files from it (in encrypted state) and saves them to my hard drive, like the tool THF.exe is showing the contents: the example below saves 20 files of which are 2 TVF files and 18 ZIP files.
Then I can decrypt the encrypted files myself because I already have C# code for that.
I would be happy to get pseudo-code for C# or an algorithm how to do this, based on the code of the tool THF.exe. I have no C knowledge and can't find how they do it.

 

[rainbow-girl]

Nobody can help?