ZIP STRUCTS UDF (from scratch)

[joakim]

As promised, here is my zip-from-scratch udf. It is not at all a substitute for any of the other functional udf's, but merely a good base if doing it from scratch yourself. I have used this code myself s part of a steganographic example with ooXML documents (but excluded from this udf), and it is very nice when you have such control over a zip file without being dependant on external libraries.

The code will currently only generate three global 2-dimensional arrays;

1. The local file headers.
2. The central directory headers.
3. The central directory end.

The data descriptor, which is rarely used, is not included. However, I believe most fields are included in the arrays.

When working with the zip content, it is advisable to use Ward's machine code udf's for zlib and crc32 (compression and checksum). It works fine on both x86 and x64.

If you wonder what the heck you would need this for, then you probably don't need it, so move on.

Anyways, apoligies for the weird coding style and variable names. I doubt that I will have time to expand on this udf, which is the reason I share it incase others feel like.

Link to some documentation; http://en.wikipedia.org/wiki/Zip_(file_format) and http://www.pkware.com/documents/casestudies/APPNOTE.TXT

Joakim

ZIP_STRUCTS.au3

[wakillon]

  On 12/13/2011 at 8:52 AM, 'joakim said:

Anyways, apoligies for the weird coding style and variable names.

Joakim

No need to apologies, it helps to a better understanding !

Nice work.

[joakim]

Hmm, what an enormous download eager in just 1 day... (2335) Is there something wrong with the counter perhaps.

[TheSaint]

That count does seem amazing.

Thanks for sharing!

[Beege]

Ya.. At this time the thread shows its been viewed 209 times. Not sure how the downloads could even possibly get up to 6600. Good post about Zip though

Edited December 15, 2011 by Beege

[trancexx]

Download managers make several connections for one download. One download can be read as 100 sometimes. The counter might be bugged.

[mLipok]

Hello
An interesting piece of code.
Are there any chances of continuation?

Best regards

mLipok

[joakim]

No, not from me.

[mLipok]

It's a shame.
It's hard.

But thanks for the earlier effort.

mLipok