zip - Pkzip - CRC-32 in Central directory file header -

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I am searching the internet that CRC-32 is being calculated which field of calculation of CRC-32 As mentioned here

Enter image details here

As you can see that there are some calculations but I do not know which fields are recorded in this calculation, the main reason is that I have to enter some data in the comment area Ahta and I still have something to do with a dock file (= pkzip) office may open in 2007+ without the message corrupt file, I after long research that convinced the CRC-32 calculation.

If there are any other ideas then I am happy to hear them

edit

Now I try to hide more information on the additional field and I think That file has been fixed, I added the footer size

If you just have a comment in the center Are putting the al directories, then the problem is not to do anything with the CRC at the end of the central directory area of ​​you The size of the central directory are messing up.


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