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hisoka

additional hex values after the end of the zip file

9 posts in this topic

Posted (edited)

Hello glad to be again in w3schools forum :)

when I opened a zip file in hex editor , I noticed that after the end of the file , there are additional hex values . For example in a zip file I opened in a hex editor there was like this :

50 4B 05 06 00 00 00 00 02 00 02 00 6F 00 00 00 84 09 00 00 00 00

50 4B 05 06  hex values represent the end of the zip file . However , I do not understand what represent these additional hex values after the end

00 00 00 00 02 00 02 00 6F 00 00 00 84 09 00 00 00 00  ??

 

 

 

 

 

Edited by hisoka

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According to Wikipedia, 50 4B 05 06 marks the start of the End of central directory header which contains some information about the ZIP file.

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and

what represent these additional hex values after 50 4B 05 06

00 00 00 00 02 00 02 00 6F 00 00 00 84 09 00 00 00 00  ??

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Check that Wikipedia article, look at the EOCD table that lists the various offsets.

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I already did . However I still do not understand what are the additional hex values after  50 4B 05 06

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The table in the Wikipedia article states exactly what all the additional bytes are.

I'll just copy what's in the article here for you and show your bytes next to them:

https://en.wikipedia.org/wiki/Zip_(file_format)#File_headers

  • 2 bytes: Number of this disk 0x0000
  • 2 bytes: Disk where central directory starts 0x0000
  • 2 bytes: Number of central directory records on the disk 0x0002
  • 2 bytes: Total number of central directory records 0x0002
  • 4 bytes: Size of central directory (bytes) 0x0000006F
  • 4 bytes: Offset of start of central directory, relative to start of archive 0x00000984
  • 2 bytes: Comment length (n) 0x0000
  • n bytes: Comment

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could you please tell me what do some of  these above mean ?

what does  Number of this disk  mean ?

what does  Disk where central directory starts mean ?

what are central directory records  ?

 

 

 

 

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Why are you asking us to do your research for you? The central directory and disks are described in detail right in the Wikipedia article under the Structure section https://en.wikipedia.org/wiki/Zip_(file_format)#Structure

If you want information directly from the source, citation 23 points directly to the official specification document https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT

In summary:

Please make more of an effort, even after we linked you directly to the information you still did not try to read it for yourself.

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Thank you , I will try to put more efforts before asking the question

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